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    Tytuł:
    Multidrug resistance-associated protein - reduction of expression in human leukaemia cells by antisense phosphorothioate olignucleotides.
    Autorzy:
    Niewiarowski, Wojciech
    Gendaszewska, Edyta
    Rębowski, Grzegorz
    Wójcik, Marzena
    >Mikołajczyk, Barbara
    Soszyński, Mirosław
    Bartosz, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1044273.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    antisense oligonucleotides
    MRP
    multidrug resistance
    Opis:
    Multidrug resistance-associated protein (MRP1) causes cellular drug resistance in several cancer cell lines. In this paper we show that antisense oligonucleotides decrease MRP1 expression in human leukaemia cells. We investigated biological activity of a series of 12 linear phosphorothioate oligonucleotides, complementary to several regions of MRP1 mRNA. The oligonucleotides were administered to leukaemia HL60/ADR cells overexpressing MRP1 protein. Then, the level of MRP1 mRNA was determined by means of semiquantitative RT-PCR and the protein level by reaction with specific monoclonal antibodies. Some of the investigated antisense oligonucleotides decrease the expression level of the MRP1 protein by 46% and its mRNA level by 76%.
    Źródło:
    Acta Biochimica Polonica; 2000, 47, 4; 1183-1188
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strategies for overcoming ABC-transporters-mediated multidrug resistance (MDR) of tumor cells
    Autorzy:
    Borowski, Edward
    Bontemps-Gracz, Maria
    Piwkowska, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/1041364.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    antitumor cytostatics
    antimetabolites
    multidrug resistance
    modulators
    Opis:
    The development of multidrug resistance (MDR) of tumors is a major cause of failure in antitumor chemotherapy. This type of crossresistance is due to the expression of ABC transporter glycoproteins actively effluxing the drug from the cells against the concentration gradient at the expense of metabolic energy, thus preventing the accumulation in cells of therapeutic concentration of active agents. In this review strategies for overcoming this adverse phenomenon are discussed. They comprise the control of expression of MDR glycoprotein transporters and control of the functioning of the expressed transporter proteins. The latter approach is discussed in more detail, comprising the following general strategies: (i) development of compounds that are not substrates of efflux pump(s), (ii) use of agents that inactivate (inhibit) MDR proteins, (iii) design of cytostatics characterized by fast cellular uptake, surpassing their mediated efflux, (iv) use of compounds competing with the drug for the MDR protein-mediated efflux. Positive and negative aspects of these strategies are analysed, with special attention put on strategy based on the use of MDR modulators in combination therapy, allowing the restoration of cytotoxic activity of clinical cytostatics towards resistant tumor cells.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 3; 609-627
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acinetobacter Baumannii Nosocomial Infections
    Autorzy:
    Sieniawski, Karol
    Kaczka, Krzysztof
    Rucińska, Monika
    Gagis, Ludmiła
    Pomorski, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/1396395.pdf
    Data publikacji:
    2013-09-01
    Wydawca:
    Index Copernicus International
    Tematy:
    Acinetobacter baumannii
    nosocomial infections
    multidrug-resistant
    Opis:
    Nosocomial infections caused by strains Acinetobacter baumannii strands are a growing clinical problem. The occurrence of multidrug-resistant strands is observed and that limits the ways of therapy considerably. The aim of the study was to determine the rate of infection and susceptibility spectrum of the species Acinetobacter baumannii isolated from patients treated at Maria Skłodowska-Curie Memorial Hospital in Zgierz with particular emphasis on surgical wards. Materials and methods. The material consisted of Acinetobacter baumannii isolates were obtained from samples of materials from patients treated at Maria Skłodowska-Curie Memorial Hospital in Zgierz from January to December 2011. Isolated bacterial strains were cultured at microbiological substrates. Isolates were identified to species using the VITEK 2 GN card (bioMérieux) and Vitek 2 automated system (bioMérieux). Susceptibility towards antibiotics of particular strains was determined by the means of AST NO 93 card. In the case of resistance towards carbapenem, the MIC was marked by E-test with Mueller Hinton substrate. The occurrence of MBL was verified by the means of disc system with Mueller Hinton substrate. Results. We have shown that total number of Acinetobacter baumannii infections at hospital was 140 (10,31% of total results of cultures). Percentage of Acinetobacter baumannii infections at wards: Intensive Care Unit 48%, Surgical Departments 20%, Internal Diseases Department 16%, Neurology 13%, other wards - 3%. The susceptibility percentage of Acinetobacter Baumannii against antibiotics: colistin 90%, imipenem 64%, meropenem 43%, ampicillin-sulbactam 28%, amikacin 27%, gentamicin 24%, cefepime 9%, ceftazidime 7%, ciprofloxacin 7% Conclusions. Acinetobacter baumannii infections are a significant proportion of nosocomial infections. Most relate to surgical wards and ICUs. Acinetobacter baumannii is resistant against most antibiotics. The highest percentage of sensitivity demonstrated for colistin and carbapenems
    Źródło:
    Polish Journal of Surgery; 2013, 85, 9; 483-490
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inhibitors of N-glycosylation as a potential tool for analysis of the mechanism of action and cellular localisation of glycoprotein P
    Autorzy:
    Wojtowicz, Karolina
    Szaflarski, Witold
    Januchowski, Radosław
    Zawierucha, Piotr
    Nowicki, Michał
    Zabel, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/1039626.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    N-glycosylation
    glycoprotein P
    multidrug resistance
    inhibitors
    Opis:
    Multidrug resistance has for many years attracted attention of numerous investigators. Attempts have also been made to increase efficiency of anti-neoplastic therapy. For this reason, most of efforts have been devoted to analysing proteins engaged in the mechanism of multidrug resistance such as the N-glycosylated membrane protein glycoprotein P. Interestingly, glycosylation probably plays a significant role in the intracellular location and activity of modified proteins. Inhibitors of glycosylation have been demonstrated to alter the activity of glycoprotein P in various ways, depending on the cell line examined. These inhibitors markedly reduce multidrug resistance of cancer cells, thus promoting success of anti-neoplastic therapy. Here, we review the basic knowledge on N-glycosylation inhibitors, their effect on glycoprotein P and their therapeutic potential.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 4; 445-450
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport of glutathione-conjugates in human erythrocytes.
    Autorzy:
    Sharma, Rajendra
    Awasthi, Sanjay
    Zimniak, Piotr
    Awasthi, Yogesh
    Powiązania:
    https://bibliotekanauki.pl/articles/1044319.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    glutathione-conjugates
    active transporters
    erythrocytes
    multidrug resistance
    Opis:
    The last step of detoxification of both endogenous and environmental toxicants is typically a conjugation that produces a bulky hydrophilic molecule. The excretion of such conjugates out of cells is of sufficient biological importance to have led to the evolution of ATP-driven export pumps for this purpose. The substrate specificity of such transporters is broad, and in some cases it has been shown to include not only anionic conjugates but also neutral or weakly cationic drugs. In the present article, we review the molecular identity, functional and structural characteristics of these pumps, mainly on the example of human erythrocytes, and discuss their physiological role in detoxification and in the multidrug resistance phenotype of cancer cells.
    Źródło:
    Acta Biochimica Polonica; 2000, 47, 3; 751-762
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Klebsiella pneumoniae: characteristics of carbapenem resistance and virulence factors
    Autorzy:
    Candan, Esra
    Aksöz, Nilüfer
    Powiązania:
    https://bibliotekanauki.pl/articles/1038935.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Klebsiella pneumoniae
    multidrug carbapenem resistance
    virulence factors
    Opis:
    Klebsiella pneumoniae, known as a major threat to public health, is the most common factor of nosocomial and community acquired infections. In this study, 50 K. pneumoniae clinical specimens isolated from bronchial, urea, blood, catheter, rectal, bile, tracheal and wound cultures were collected. These isolates were identified and carbapenem resistance was determined via an automated system, CHROMagar Orientation and CHROMagar KPC. The carbapenemase gene regions (blaIMP, blaVIM, blaOXA, blaNDM and blaKPC) and presence of virulence factors (magA, k2A, rmpA, wabG, uge, allS, entB, ycfM, kpn, wcaG, fimH, mrkD, iutA, iroN, hly ve cnf-1) of these isolates were determined by using Multiplex-PCR. The OXA-48 carbapenemase gene regions were determined in 33 of 50 K. pneumoniae strains. In addition, NDM-1 resistance in one, OXA-48 and NDM-1 resistance in four unusual K. pneumoniae isolates were detected. Virulence gene regions that were encountered among K. pneumoniae isolates were 88% wabG, 86% uge, 80% ycfM and 72% entB, related with capsule, capsule lipoprotein and external membrane protein, responsible for enterobactin production, respectively. Even though there was no significant difference between resistant and sensitive strains due to the virulence gene regions (P≥0.05), virulence factors in carbapenem resistant isolates were found to be more diverse. This study is important for both, to prevent the spread of carbapenem resistant infections and to plan for developing effective treatments. Moreover, this study is the first detailed study of the carbapenem resistance and virulence factors in K. pneumoniae strains.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 4; 867-874
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interaction of phenothiazines, stilbenes and flavonoids with multidrug resistance-associated transporters, P-glycoprotein and MRP1
    Autorzy:
    Wesołowska, Olga
    Powiązania:
    https://bibliotekanauki.pl/articles/1039822.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    multidrug resistance-associated protein 1 (MRP1,ABCC1)
    P-glycoprotein (ABCB1)
    phenothiazines
    multidrug resistance reversal
    stilbenes
    flavonoids
    Opis:
    Multidrug resistance (MDR) of cancer cells poses a serious obstacle to successful chemotherapy. The overexpression of multispecific ATP-binding cassette transporters appears to be the main mechanism of MDR. A search for MDR-reversing agents able to sensitize resistant cells to chemotherapy is ongoing in the hope of their possible clinical use. Studies of MDR modulators, although they have not produced clinically beneficial effects yet, may greatly enrich our knowledge about MDR transporters, their specificity and mechanism of action, especially substrate and/or inhibitor recognition. In the present review, interactions of three groups of modulators: phenothiazines, flavonoids and stilbenes with both P-glycoprotein and MRP1 are discussed. Each group of compounds is likely to interact with the MDR transporters by a different mechanism. Phenothiazines probably interact with drug binding sites, but they also could indirectly affect the transporter's activity by perturbing lipid bilayers. Flavonoids mainly interact with ABC proteins within their nucleotide-binding domains, though the more hydrophobic flavonoids may bind to regions within transmembrane domains. The possible mechanism of MDR reversal by stilbenes may result from their direct interaction with the transporter (possibly within substrate recognition sites) but some indirect effects such as stilbene-induced changes in gene expression pattern and in apoptotic pathways should also be considered. Literature data as well as some of our recent results are discussed. Special emphasis is put on cases when the interactions of a given compound with both P-glycoprotein and MRP1 have been studied simultaneously.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 4; 433-448
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The ability to overcome multidrug resistance of tumor cell lines by novel acridine cytostatics with condensed heterocyclic rings.
    Autorzy:
    Bontemps-Gracz, Maria
    Kupiec, Agnieszka
    Antonini, Ippolito
    Borowski, Edward
    Powiązania:
    https://bibliotekanauki.pl/articles/1043812.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    acridine cytostatics
    cytotoxic activity
    multidrug resistance
    antitumor compounds
    Opis:
    Two recently synthesized groups of acridine cytostatics containing fused heterocyclic ring(s): pyrazoloacridines (PAC) and pyrazolopyrimidoacridines (PPAC) were tested in regard to their in vitro cytotoxic activity towards a panel of sensitive and resistant human tumor cell lines. The obtained results corroborate our earlier hypothesis on the essential role of heterocyclic ring fused to the acridine moiety in the ability of acridine cytostatics to overcome multidrug resistance of tumor cells. The presence, location and kind of substituents considerably influenced both the cytotoxic activity of the derivatives and their ability to overcome multidrug resistance. The same factors also affected the cytostatics ability to differentiate between tumor cell lines with various types of drug exporting pumps.
    Źródło:
    Acta Biochimica Polonica; 2002, 49, 1; 87-92
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport functions and physiological significance of 76 kDa Ral-binding GTPase activating protein (RLIP76).
    Autorzy:
    Awasthi, Sanjay
    Sharma, Rajendra
    Yang, Yusong
    Singhal, Sharad
    Pikula, Slawomir
    Bandorowicz-Pikula, Joanna
    Singh, Shivendra
    Zimniak, Piotr
    Awasthi, Yogesh
    Powiązania:
    https://bibliotekanauki.pl/articles/1043688.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    RLIP76
    RalBP1
    glutathione conjugate
    multidrug resistance
    transport
    Opis:
    We have recently demonstrated that a previously known Ral-binding GTPase activating protein, RLIP76, can also catalyze ATP-dependent transport of various structurally unrelated xeno- and endobiotics irrespective of their net charge (Awasthi et al., 2000, Biochemistry, 39: 9327). RLIP76 is a non-ATP binding cassette (ABC) protein but it has two ATP-binding sites and shows basal ATPase activity which is stimulated in the presence of its transport substrates (allocrites) such as doxorubicin (DOX) and S-(2,4-dinitrophenyl) glutathione (DNP-SG). Proteoliposomes reconstituted with purified RLIP76 catalyze ATP-dependent, saturable transport of DOX, as well as of glutathione-conjugates including leukotrienes (LTC4) and the GSH-conjugate of 4-hydroxynonenal (GS-HNE). In erythrocytes the majority of transport activity for DOX, GS-HNE, and LTC4 is accounted for by RLIP76. Cells exposed to mild oxidative stress show a rapid and transient induction of RLIP76 resulting in an increased efflux of GS-HNE and acquire resistance to oxidative stress mediated toxicity and apoptosis. Cells transfected with RLIP76 acquire resistance to DOX through increased efflux of the drug suggesting its possible role in the mechanisms of drug-resistance. In this article, we discuss the significance of transport functions of RLIP76 highlighting its role in the defense mechanisms against oxidative injury, and modulation of signaling mechanisms.
    Źródło:
    Acta Biochimica Polonica; 2002, 49, 4; 855-867
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative studies on cell stimulatory, permeabilizing and toxic effects induced in sensitive and multidrug resistant fungal strains by amphotericin B (AMB) and N-methyl-N-D-fructosyl amphotericin B methyl ester (MFAME).
    Autorzy:
    Szlinder-Richert, Joanna
    Cybulska, Barbara
    Grzybowska, Jolanta
    Borowski, Edward
    Prasad, Rajendra
    Powiązania:
    https://bibliotekanauki.pl/articles/1044404.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    antifungal action
    amphotericin B derivative
    multidrug resistance
    amphotericin B
    Opis:
    N-Methyl-N-D-fructosyl-amphotericin B methyl ester (MFAME) is a new derivative of amphotericin B, which is characterised by low toxicity to mammalian cells and good solubility in water of its salts. The antifungal activity and effects of MFAME towards Candida albicans and Saccharomyces cerevisiae multidrug resistant MDR(+) and sensitive MDR(-) strains was compared with those of parent compound. The results obtained indicate that MDR(+) S. cerevisiae was sensitive to MFAME as well as to AMB. MFAME exhibited the same effects on fungal cells studied as parent antibiotic. The two antibiotics, depending on the dose applied induced cell stimulation, K+ efflux, and/or had a toxic effect.
    Źródło:
    Acta Biochimica Polonica; 2000, 47, 1; 133-140
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Acinetobacter baumannii resistance patterns in patients with chronic obstructive pulmonary disease (COPD) in terms of choice of effective empiric antibiotic therapy
    Autorzy:
    Grochowalska, Aneta
    Kozioł-Montewka, Maria
    Sobieszczańska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/989765.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    copd
    antibiotics
    acinetobacter baumannii
    multidrug-resistant strains
    co-infection
    Opis:
    Introduction. Multi-resistant Acinetobacter baumannii isolated from patients has become one of the most hazardous pathogens in health care settings. The aim of the study was to analyze pneumonia caused by Acinetobacter baumannii in patients hospitalized because of exacerbation of chronic obstructive pulmonary diseases (COPD), who were admitted to the Pulmonology Ward of the Masovian Specialistic Hospital in Radom (MSS). The incidence and drug sensitivity of these non-fermenting rods were evaluated, and compliance with antimicrobial procedure with the algorithm of the guidelines in applicable recommendations, was estimated. This should result in determining the local patterns of resistance and verifying therapeutic procedures in accordance with the assumptions of hospital antibiotic policy. In addition, the study examined the effectiveness of empiric and targeted therapy according to the clinical condition of the patient, and the eradication of A. baumannii, in comparison with the aggravating factors of the patient. Materials and Method. The retrospective study included 90 patients with exacerbation of COPD whose etiological factor of infection was A. baumannii, hospitalized in the Department of Pulmonology (MSS) in 2012–2016. Results. Studies were conducted on 90 patients with COPD exacerbation from which A. baumannii was isolated. Co-infections with other bacterial species among 41 patients were additionally noted. The majority of A. baumannii strains showed a high resistance (90%) to fluoroquinolones, ceftazidime, piperacillin/tazobactam. For strains causing a co-infection, drug resistance was successively 44–56%, 44%, 44%. All of patients received empirical therapy. The most commonly used drug was amoxicillin with a clavulanic acid, often combined with fluoroquinolone. This type of therapy was effective among 10% of patients. The mortality in this group was determined at 29%. Among 79% of patients with COPD, a targeted therapy was performed which proved to be effective in 58% of treated cases by susceptibility testing. The highest efficacy was observer after the use of colistin and carbapenems. Conclusion. In the performed study, the infections caused by multi-resistant Acinetobacter baumannii, were observed in COPD, which should be taken into consideration in choosing empirical antibiotic therapy. Simultaneously, the local resistance patterns of multi-drug-resistant (MDR) Gram-negative strains co-infecting COPD should be considered in empirical treatment. Moreover, both additional clinical complication and co-infections contribute to a more severe course of diseases. In this study, the mortality percent exceeded 29%.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2017, 24, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport of organic anions by multidrug resistance-associated protein in the erythrocyte.
    Autorzy:
    Rychlik, Błażej
    Pułaski, Łukasz
    Sokal, Adam
    Soszyński, Mirosław
    Bartosz, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1044320.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    glutathione S-conjugates
    erythrocyte
    multidrug resistance-associated protein
    glutathione
    transport
    Opis:
    The active transport of oxidized glutathione and glutathione S-conjugates has been demonstrated for the first time in erythrocytes and this cell remained the main subject of research on the "glutathione S-conjugate pump" for years. Further studies identified the "glutathione S-conjugate pump" as multidrug resistance-associated protein (MRP). Even though cells overexpressing MRP and isolated MRP provide useful information on MRP structure and function, the erythrocyte remains an interesting model cell for studies of MRP1 in its natural environment, including the substrate specificity and ATPase activity of the protein.
    Źródło:
    Acta Biochimica Polonica; 2000, 47, 3; 763-772
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the AOK Plus data and derived hospital network
    Analiza danych AOK Plus i zbudowanej na ich podstawie sieci szpitalnej
    Autorzy:
    Lonc, Agata
    Piotrowska, Monika Joanna
    Sakowski, Konrad
    Powiązania:
    https://bibliotekanauki.pl/articles/953416.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    healthcare data analysis
    overlapping data
    healthcare network
    multidrug-resistant bacteria
    Opis:
    We present analysis of admission/discharge data from insurance provider for Saxony and Thuringia (Germany) for years 2010-2016. Study of such data is necessary to derive a structure of healthcare system transfer network, as no patients' transfer data are available. Hospital network is a basis for simulation of multidrug-resistant bacteriae spread allowing to study the effectiveness of disease-control strategies. In this paper, the properties of the dataset under consideration are presented and discussed. Moreover, the resulting interhospital network structure is analyzed.
    Źródło:
    Mathematica Applicanda; 2019, 47, 1
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occurrence and plasmid profiles of multidrug-resistant Enterobacteriaceae isolated from hawked soymilk samples in the Polytechnic of Ibadan Community, Nigeria
    Autorzy:
    Fadahunsi, I.F.
    Babalola, D.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096396.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    occurrence
    plasmid profiles
    multidrug-resistant Enterobacteriaceae
    soymilk
    Ibadan Polytechnic
    Community
    Opis:
    This study was conducted to determine the occurrence, antibiotic susceptibility pattern, and plasmid profile of multidrug-resistant (MDR) Enterobacteriaceae isolated from soymilk hawked in the Ibadan Polytechnic Community, Nigeria. Bacterial isolation and identification were performed using a culture-dependent method and biochemical characterization, respectively, while antibiotic susceptibility was tested using the disk diffusion method. Plasmid analysis and curing were performed using standard procedures. The results revealed the following occurrence rate of bacterial species in soymilk samples collected from all axes (South, North, East, West, and Central) of Ibadan Polytechnic: Citrobacter spp., 64%; Klebsiella spp., 7%; Enterobacter spp., Escherichia coli, and Serratia spp., 6% each; Proteus spp., 5%; and Salmonella spp. and Shigella spp., 3% each. The highest heterotrophic bacterial count of 9.3 × 103 CFU/ml was recorded at Ibadan Polytechnic North and South, while the least count (3.2 × 107 CFU/ml) was recorded at Ibadan Polytechnic Central. The highest enteric bacterial count of 1.3 × 103 CFU/ml was recorded in soymilk samples from Ibadan Polytechnic Central, while the least count of 1.7 × 107 CFU/ml was recorded in soymilk samples from Ibadan Polytechnic North. A total of 26% of the isolates showed resistance to cefpodoxime, while 88% of the isolates were susceptible to trimethoprim-sulfamethoxazole. Four of the MDR isolates possessed plasmid bands ranging from 6 to 1 with molecular weights from 2.7 to 17.2 kbp. Enterobacteriaceae such as isolates O14 (Klebsiella spp.) and B10 (E. coli) retained their resistance to antibiotics even after removal of plasmids, while isolates S13 (Citrobacter spp.) and O4 (Shigella spp.) were susceptible to some antibiotics after curing. Conclusively, soymilk sold in the sampled areas was highly contaminated with Enterobacteriaceae, thereby indicating poor hygiene standards of soymilk production.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 2; 209-223
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects and time-kill assessment of amoxicillin used in combination with chloramphenicol against bacteria of clinical importance
    Autorzy:
    Olajuyigbe, Olufunmiso
    Coopoosamy, Roger
    Afolayan, Anthony
    Powiązania:
    https://bibliotekanauki.pl/articles/1038543.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    drug-drug interactions
    fractional inhibitory concentrations
    multidrug resistance
    time-kill assessment
    Opis:
    With the emergence of multidrug-resistant organisms in an era when drug development faces challenges causing pharmaceutical companies to curtail or abandon research on anti-infective agents, the use of combined existing antimicrobial agents may be an alternative. This study evaluated the effects of combining amoxicillin and chloramphenicol, to which many bacteria have become resistant, in vitro against Gram positive and Gram negative bacteria by agar diffusion, checkerboard and time-kill assays. The test isolates were susceptible to amoxicillin with minimum inhibitory concentrations (MICs) ranging between 0.448 and 500 µg/ml and between 1.953 and 31.25 µg/ml for chloramphenicol. Upon combining these agents, there was a drastic reduction in their MICs indicating an increased antibacterial activity that showed synergistic interaction against all the bacteria. At the highest concentrations, the inhibition zones ranges were 20.33-38.33±0.58 µg/ml for amoxicillin, 27.67-37.67±0.58 µg/ml for chloramphenicol and 31.67-39.33±0.58 µg/ml for the combined agents. The fractional inhibitory concentration indices (FICIs) showed synergy ranging from 0.129 to 0.312 while FICIs for additive interaction were between 0.688 and 1.0. There was no antagonistic interaction. At the 1/2MICs of the combined antibiotics, all the tested bacteria, except for Klebsiella pneumoniae ATCC 4352, Proteus vulgaris CSIR 0030 and Enterococcus cloacae ATCC 13047 were eliminated before 24 h. At the MICs, all the tested bacteria were eliminated except Enterococcus cloacae ATCC 13047 which was almost totally eliminated. Post-antibiotic assessment after 48 h showed that all the cultures were sterile except for that of Enterococcus cloacae ATCC 13047. The lack of antagonism between these antibacterial agents in checkerboard and time-kill assays suggested that combining amoxicillin with chloramphenicol can provide an improved therapy in comparison to the use of each antibiotic individually. The study indicates the potential beneficial value of combining amoxicillin and chloramphenicol in the treatment of microbial infections in clinical settings.
    Źródło:
    Acta Biochimica Polonica; 2017, 64, 4; 609-613
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antibacterial activity of Ulva fasciata against multidrug resistant bacterial strains
    Autorzy:
    Chandrasekaran, M.
    Venkatesalu, V.
    Raj, G.A.
    Krishnamoorthy, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11746.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    antibacterial activity
    Ulva fasciata
    multidrug
    resistance
    bacterial strain
    methanol extract
    treatment
    Opis:
    The present study was conducted to evaluate the antibacterial activity of different organic solvent increasing polarity viz., hexane, chloroform, ethyl acetate, acetone and methanol extracts of Ulva fasciata (Chlorophyceae) were collected from Kanniyakummari, Gulf of Mannar biosphere Reserve, Tamilnadu, India. Marine green algae extracts of U. fasciata against multi-drug resistant standard and clinical bacterial strains viz., Bacillus subtilis, Streptococcus pyogenes, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Salmonella typhimurium, Vibrio cholerae, Shigella flexneri, Proteus mirabilis and P. vulgaris. The ethyl acetate extracts of U. fasciata showed highest antibacterial activity against all the bacterial strains tested. The mean zone of inhibition produced by the extracts in disc diffusion assays were ranged from 7.1 mm to 15.0 mm. The Minimum Inhibitory Concentrations (MIC) were between 125 μg/ml and 500 μg/ml, while the Minimum Bactericidal Concentrations (MBC) were between 250 μg/ml and 1000 μg/ml. The highest mean of zone inhibition (15.0 mm) and lowest MIC (125 μg/ml) and MBC (250 μg/ml) values were observed in ethyl acetate extract of U. fasciata against B. subtilis. The ethyl acetate extract of the U. fasciata showed the presence of phytochemicals, terpenoids, tannins and phenolic compounds in U. fasciata than the other solvents extracts. The present results of the ethyl acetate extract of U. fasciata can be used as an antibacterial substance for the treatment of multi drug resistant bacterial infections.
    Źródło:
    International Letters of Natural Sciences; 2014, 14
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on biosynthesis of silver nanoparticles using Rhizopus sp. and its antibacterial efficacy on E. coli MDR strains
    Autorzy:
    Hiremath, J.
    Rathod, V.
    Ninganagouda, S.
    Singh, D.
    Prema, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/11479.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    biosynthesis
    silver nanoparticle
    Rhizopus
    antibacterial activity
    Escherichia coli
    multidrug resistance
    nanotechnology
    Opis:
    Nanotechnology is a field that is burgeoning day by day, making an impact in all spheres of human life. Biological methods of synthesis have paved way for the “greener synthesis” of nanoparticles and these have proven to be better methods due to slower kinetics, they offer better manipulation and control over crystal growth and their stabilization. In this context we have investigated extracellular biosynthesis of silver nanoparticles (AgNPs) using cell-free extract of Rhizopus spp.. Formation of AgNPs was indicated by the change in the colour of the cellfree extract from yellow to dark brown under static condition after 48 hrs of incubation. Characterization of AgNPs was carried out by UV-Vis Spectroscopy which gave sharp plasmon resonance peak at 429 nm corresponding to spherical shaped nanoparticles. Transmission electron microscopy (TEM) micrograph showed formation of well-dispersed AgNPs in the range of 25-50 nm. Scanning electron microscopy (SEM) showed the particles to be uniformly dispersed without agglomeration with smooth morphology. EDS showed the presence of elemental silver at 3kev. X-ray diffraction (XRD)-spectrum of the AgNPs exhibited 2θ¸ values corresponding to nanocrystal. These biosynthesized AgNPs were used to study their antimicrobial activity against Multi-drug resistant (MDR) E. coli strains, by Agar diffusion method. Zone of inhibition was measured. Synthesis of nanosized particles with antibacterial properties, which are called "nanoantibiotics", is of great interest in the development of new pharmaceutical products.
    Źródło:
    International Letters of Natural Sciences; 2014, 18
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of herbal materials on the P-glycoprotein activity and function
    Wpływ surowców roślinnych an aktywność i funkcje glikoproteiny P
    Autorzy:
    Bogacz, A.
    Deka-Pawlik, D.
    Bartkowiak-Wieczorek, J.
    Karasiewicz, M.
    Kujawski, R.
    Kowalska, A.
    Chalas, A.
    Czerny, B.
    Grzeskowiak, E.
    Mrozikiewicz, P.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/72519.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    herbal material
    P-glycoprotein activity
    P-glycoprotein function
    multidrug resistance
    drug transporter
    Opis:
    P-glycoprotein (P-gp) encoded by the MDR1 (multidrug resistance 1) gene is ATP-dependent transporting protein which is localizated in the cell membrane. P-gp is expressed Review Article 130 A. Bogacz, D. Deka-Pawlik, J. Bartkowiak-Wieczorek, M. Karasiewicz, R. Kujawski, A. Kowalska, A. Chałas, B. Czerny, E. Grześkowiak, P. M. Mrozikiewicz mainly in organs with the secretory functions and its physiological role concerns tissue protection against xenobiotics. P-glycoprotein is involved in the permeability barriers of the blood-brain, blood-placenta directly protecting these organs. It participates in the transport of many drugs and other xenobiotics affecting their absorption, distribution, metabolism and excretion. The high P-gp activity in the cell membranes of cancer tissue is a major cause of lack of effectiveness of chemotherapy. Hence, the methods which could increase the sensibility of these pathological cells to cytostatics are still being searched. In the experimental studies it was shown that natural plant substances may have an effect on the expression level and activity of P-glycoprotein. Hypericum perforatum, Ginkgo biloba and Camellia sinensis increase P-gp activity while curcumin from Curcuma longa, piperine and silymarin inhibit this protein. Taking into account a wide substrate spectrum of P-gp, application of our knowledge on interactions of herbals and synthetic drugs should be considered in order to improve drug impact on different tissues.
    Glikoproteina P (P-gp) kodowana przez gen oporności wielolekowej MDR1 to ATP-zależne białko transportowe zlokalizowane w błonach komórkowych. P-gp ulega ekspresji głównie w obrębie narządów pełniących funkcje wydzielnicze, a jej fizjologiczna rola polega na ochronie tkanek przed ksenobiotykami. Glikoproteina P bierze udział w barierach przepuszczalności krew-mózg, krew-łożysko, chroniąc bezpośrednio te organy. Uczestniczy w transporcie leków i innych ksenobiotyków, wpływając na ich absorpcję, dystrybucję, metabolizm i wydalanie. Wysoka aktywność P-gp w błonach komórek nowotworowych jest główną przyczyną braku skuteczności chemioterapii. Poszukiwane są więc sposoby zwiększenia wrażliwości tych patologicznych komórek na cytostatyki. Badane są w tym kierunku naturalne substancje roślinne, ponieważ zaobserwowano ich wpływ na stopień ekspresji oraz aktywność glikoproteiny P. Hypericum perforatum, Ginkgo biloba i Camellia sinensis to surowce zwiększające aktywność P-gp, natomiast kurkumina z korzenia ostryża długiego, piperyna oraz sylimaryna hamują działanie tego białka. Ze względu na tak wielokierunkowe oddziaływanie fitoterapii oraz szerokie spektrum substratowe P-gp, stosując wiedzę na temat interakcji surowców roślinnych z lekami syntetycznymi należy zawsze mieć na uwadze zwiększenie biodostępności stosowanych leków.
    Źródło:
    Herba Polonica; 2013, 59, 4
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Induction of the multixenobiotic/multidrug resistance system in various cell lines in response to perfluorinated carboxylic acids
    Autorzy:
    Rusiecka, Izabela
    Składanowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1040751.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    multixenobiotic resistance
    multidrug resistance
    perfluorinated carboxylic acids
    flow cytometry
    ABCB1
    ABCC1
    Opis:
    The multixenobiotic resistance (closely related to multidrug resistance) system controls transport across the plasma membrane as a defense against toxic molecules. Multixenobiotic resistance system consists of an efflux pump, ABCB1 (also named P-glycoprotein, P-gp), and/or a molecule of the ABCC family (also named multiple resistance associated protein, MRP). ABCB1 is able to increase efflux of many low-molecular foreign molecules. Measuring system induction may be used as a biomarker of cell/organism exposure to foreign substances. Various established cell lines were tested for constitutive and induced multixenobiotic resistance proteins by Western blotting immunodetection. The pumping function was indirectly assayed with Rhodamine B by visualization of cell fluorescence in the presence of verapamil. Changes in ABC proteins were measured by flow cytometry after exposition to various perfluorinated carboxylic acids. MCF7 and HeLa cells were found to contain the highest constitutive level of both ABCB1 and ABCC1. HEK293 exhibited much less ABCB1 and no activity of pumping out Rhodamine B. The pumping activity was found to be related to the amount of the cell-type specific 170 kDa ABCB1 protein. An 8-day exposure to 10-4 M perfluorononanoic acid resulted in about 2-2.5-fold increase of ABCB1 level. That was confirmed also for short times by flow cytometry of cells exposed to perfluorinated acids and its natural congeners. Both ABCB1- and ABCC1-related fluorescence increased along with the carbon chain in acids from C6 up to C9 and decreased for C10. Measuring of multixenobiotic resistance changes in vitro induced by chemicals may be a convenient test for screening for their potential toxicity.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 2; 329-337
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Induction of the multixenobiotic/multidrug resistance system in HeLa cells in response to imidazolium ionic liquids
    Autorzy:
    Rusiecka, Izabela
    Składanowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1039912.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    multidrug resistance
    multixenobiotic resistance
    imidazolium ionic liquids
    flow cytometry
    ABCB1
    ABCC1
    Opis:
    The multixenobiotic/multidrug resistance (MXR/MDR) system controls transport of foreign molecules across the plasma membrane as a preventive measure before toxicity becomes apparent. The system consists of an efflux pump, ABCB1, and/or a member of the ABCC family. Ionic liquids are broadly used solvents with several unique properties such as wide liquid range, negligible vapor pressure, good thermal and chemical stability and extraordinary dissolution properties for organic and inorganic compounds. Ionic liquids containing imidazolium ring are frequently used as solvents in drug synthesis. Constitutive and induced amounts of ABCB1 and ABCC1 proteins were estimated here by Western blotting and quantified by flow cytometry in HeLa cells exposed to three homologous 1-alkyl-3-methylimidazolium and one benzyl ring substituted salts. Aliphatic substituents in position 1 of the salts caused a weak toxicity but 1-benzyl ring was strongly toxic. An 8-day long treatment with 10-4 M 1-hexyl-3-methylimidazolium chloride resulted in an about 1.5-fold increase of ABCB1 level and over 2-fold increase of ABCC1 level. The amounts of both investigated ABC-proteins were linearly dependent on the length of the imidazolium ring side chain. Such distinctive changes of the amount of MXR/MDR proteins measured in cultured cells may be a useful marker when screening for potential toxicity of various chemicals.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 2; 187-192
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of NAD(P)H:quinone oxidoreductase (NQO1) in apoptosis induction by aziridinylbenzoquinones RH1 and MeDZQ
    Autorzy:
    Nemeikaitė-Čėnienė, Aušra
    Dringelienė, Aldona
    Šarlauskas, Jonas
    Čėnas, Narimantas
    Powiązania:
    https://bibliotekanauki.pl/articles/1041349.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    non-cross resistant antitumour benzoperimidines and anthrapyridones
    ATP-dependent efflux
    erythrocytes
    multidrug resistance
    energy state
    Opis:
    We aimed to characterize the role of NAD(P)H:quinone oxidoreductase (NQO1) in apoptosis induction by antitumour quinones RH1 (2,5-diaziridinyl-3-hydroxymethyl-6-methyl-1,4-benzoquinone) and MeDZQ (2,5-dimethyl-3,6-diaziridinyl-1,4-benzoquinone). Digitonin-permeabilized FLK cells catalyzed NADPH-dependent single- and two-electron reduction of RH1 and MeDZQ. At equitoxic concentrations, RH1 and MeDZQ induced apoptosis more efficiently than the nonalkylating duroquinone or H2O2. The antioxidant N,N'-diphenyl-p-phenylene diamine, desferrioxamine, and the inhibitor of NQO1 dicumarol, protected against apoptosis induction by all compounds investigated, but to a different extent. The results of multiparameter regression analysis indicate that RH1 and MeDZQ most likely induce apoptosis via NQO1-linked formation of alkylating species but not via NQO1-linked redox cycling.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 4; 937-942
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of new non-cross resistant antitumour agents on the energy state of human erythrocytes
    Autorzy:
    Nowak, Robert
    Baranowska-Bosiacka, Irena
    Stefańska, Barbara
    Machaliński, Bogusław
    Hłyńczak, Alina
    Tarasiuk, Jolanta
    Powiązania:
    https://bibliotekanauki.pl/articles/1041354.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    non-cross resistant antitumour benzoperimidines and anthrapyridones
    ATP-dependent efflux
    erythrocytes
    multidrug resistance
    energy state
    Opis:
    Multidrug resistance (MDR) of tumour cells is related to the overexpression of ATP-dependent pumps responsible for the active efflux of antitumour agents out of resistant cells. Benzoperimidine and anthrapyridone compounds exhibit comparable cytotoxic activity against sensitive and MDR tumour cells. They diffuse extremely rapidly across the plasma membrane and render the ATP-dependent efflux inefficient. Such uptake could disturb an energy metabolism of normal cells possessing an elevated level of ATP-dependent proteins, especially erythrocytes having a high level of the MRP1, MRP4 and MRP5 proteins. In this study the effect of five antitumour agents: benzoperimidine (BP1), anthrapyridones (CO1, CO7) and reference drugs used in the clinic: doxorubicin (DOX) and pirarubicin (PIRA), on the energetic state in human erythrocytes has been examined. These compounds have various types of structure and kinetics of cellular uptake (slow - DOX, CO7, moderate - PIRA, fast - BP1, CO1) resulting in their different ability to saturate ATP-dependent transporters. The energetic state of erythrocytes was examined by determination of purine nucleotide contents (ATP, ADP, AMP), NAD+ and values of adenylate energy charge (AEC) using an HPLC method. It was found that the level of nucleotides as well as the AEC value of erythrocytes were not changed during 24 h of incubation with these agents independently of their structure and ability to saturate ATP-dependent pumps. This is a very promising result in view of their potential use in the clinic as antitumour drugs against multidrug resistant cancers.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 4; 953-957
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antisense hairpin loop oligonucleotides as inhibitors of expression of multidrug resistance-associated protein 1: Their stability in fetal calf serum and human plasma.
    Autorzy:
    Rębowski, Grzegorz
    Wójcik, Marzena
    Boczkowska, Małgorzata
    Gendaszewska, Edyta
    Soszyński, Mirosław
    Bartosz, Grzegorz
    Niewiarowski, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/1044049.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    human plasma
    3' -exonuclease activity
    multidrug resistance-associated protein
    fetal calf serum
    antisense hairpin loop oligonucleotides
    Opis:
    Multidrug resistance-associated protein (MRP1) is a transmembrane pump protein responsible for the efflux of chemotherapeutic drugs, an important cause of anticancer treatment failure. Trying to circumvent MRP-mediated resistance we designed and synthesized hairpin loops forming antisense oligodeoxyribonucleotides (ODNs), both phosphodiesters (PO-ODNs) and their phosphorothioate analogues (PS-ODNs), to reduce the protein expression by targeting its mRNA in a sequence specific manner. Melting temperature measurements as well as polyacrylamide gel electrophoresis supported the preferential formation of a secondary structure, which was expected to protect ODNs against 3'-exonuclease degradation. ODNs and PS-ODNs designed in this work were successfully tested as antisense inhibitors of the expression of MRP1 in the leukaemia HL60/ADR cell line. Foreseeing the necessity to perform clinical studies with such ODNs we investigated their stability against the 3'-exonuclease activity of fetal calf serum and human plasma. Under the conditions, corresponding to physiological ones, we observed high stability of hairpin loop forming ODNs, especially those containing longer (e.g. 7 base pair) stems. Comparative studies on the stability of chemically unmodified hairpin loop forming ODNs and their PS-counterparts indicated that endonuclease activity did not play any important role in the process of their nucleolytic degradation. Our studies provide strong evidence for high stability of chemically unmodified hairpin loop ODNs, making them an attractive alternative to phosphorothioate analogues commonly used in antisense strategy.
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 4; 1061-1076
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative effects of selected plant polyphenols, gallic acid and epigallocatechin gallate, on matrix metalloproteinases activity in multidrug resistant MCF7/DOX breast cancer cells
    Autorzy:
    Nowakowska, Anna
    Tarasiuk, Jolanta
    Powiązania:
    https://bibliotekanauki.pl/articles/1038784.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    phenolic compounds
    gallic acid
    epigallocatechin gallate
    matrix metalloproteinases
    human breast cancer MCF7 cells
    multidrug resistance MDR
    Opis:
    The aim of the study was to investigate the effect of selected polyphenols: gallic acid (GA) and epigallocatechin gallate (EGCG) on matrix metalloproteinase (MMP-2 and MMP-9) activity in multidrug resistant (MDR) human breast adenocarcinoma cells: MCF7/DOX cells and obtained recently in our laboratory MCF7/DOX500 cells by the permanent selection of MCF7/DOX cells with 500 nM doxorubicin (DOX). The activity of MMP-2 and MMP-9 and the effect of studied polyphenols on these matrix proteases were examined by gelatin zymography assays. We have found that the activity of MMP-2 and MMP-9 significantly increased in resistant MCF7/DOX and MCF7/DOX500 cells whereas they were not detected in sensitive MCF7 cells. It was also observed that GA (30, 60, 100 and 120 µM) and EGCG (5, 10 and 20 µM) caused a comparable concentration-dependent inhibition of MMP-2 and MMP-9 activity in MCF7/DOX and MCF7/DOX500 cells. Control experiments confirmed that examined compounds in these ranges of concentration did not affect the cell growth of MCF7/DOX and MCF7/DOX500 sublines (80-100% of control cell growth was observed in the presence of studied polyphenols).
    Źródło:
    Acta Biochimica Polonica; 2016, 63, 3; 571-575
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gruźlica u dzieci – od diagnostyki do chemioprofilaktyki i leczenia
    Tuberculosis in children – from diagnostics to chemoprophylaxis and treatment
    Autorzy:
    Kosińska, Joanna
    Górski, Paweł
    Grzelewska-Rzymowska, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/1033210.pdf
    Data publikacji:
    2014
    Wydawca:
    Medical Communications
    Tematy:
    BCG vaccine
    IGRA tests
    latent tuberculosis
    multidrug-resistant tuberculosis
    tuberculosis in children
    gruźlica u dzieci
    gruźlica utajona
    gruźlica wielolekooporna
    testy igra
    szczepienia bcg
    Opis:
    Tuberculosis is a disease known to the mankind for centuries, but still poses a big social problem and a challenge for the twenty-first century medicine. It is estimated that at least 30% of the global population is infected with the tubercle bacillus. The disease develops in 9 million people annually, including 1 million children aged below 15. Tuberculosis in the paediatric population requires particular attention because the incidence in this age group is a measure of the epidemiological situation of tuberculosis in a given area. Diagnosis of tuberculosis in children is particularly difficult due to its sparse and non-specific symptoms, imitating other diseases and increasing number of cases of mycobacterial infection without clinical, radiological and microbiological symptoms – so-called latent tuberculosis. If conditions are favourable, latent mycobacterial infection may develop into an active disease and therefore the authors draw attention to the need for rapid diagnosis of infection with Mycobacterium tuberculosis and describe the existing diagnostic methods (tuberculin skin test, interferon-gamma release assays) as well as indications for chemoprophylaxis and principles of conducting it in children. Moreover, the authors also emphasise the necessity for a thorough interview and physical examination, analysis of sputum-positive patient’s contacts, imaging and microbiological tests as well as a significant role of family physicians and paediatricians. Due to the growing phenomenon of resistance of mycobacteria to different drugs (according to the WHO, the general number of new cases of MDR-TB and XDR-TB diagnosed in 2012 amounts to 450 thousand), the issue of multidrug-resistant tuberculosis as well as its treatment and available medications are discussed.
    Choć gruźlica jest chorobą znaną ludzkości od stuleci, nadal stanowi duży problem społeczny i wyzwanie dla medycyny XXI wieku. Ocenia się, że co najmniej 30% światowej populacji jest zakażone prątkami gruźlicy. Choroba rocznie rozwija się u 9 milionow ludzi, w tym u 1 miliona dzieci poniżej 15. roku życia. Szczegolnej uwagi wymaga gruźlica właśnie w populacji dziecięcej, gdyż zapadalność w tej grupie wiekowej jest miernikiem sytuacji epidemiologicznej gruźlicy na danym terenie. Rozpoznawanie gruźlicy u dzieci jest szczegolnie trudne ze względu na jej skąpe i nieswoiste objawy, imitowanie innych jednostek chorobowych oraz zwiększającą się liczbę przypadkow zakażenia prątkami bez objawow klinicznych, radiologicznych i mikrobiologicznych – tzw. gruźlicy latentnej. Utajone zakażenie prątkiem gruźlicy może w dogodnych warunkach ulec progresji w czynną postać choroby i dlatego autorzy zwracają uwagę na konieczność szybkiej diagnostyki zakażenia Mycobacterium tuberculosis, opisują służące temu metody (OT, IGRA), wskazania do włączenia chemioprofilaktyki i zasady jej prowadzenia u dzieci. Podkreślają konieczność przeprowadzania wnikliwego badania podmiotowego, przedmiotowego, analizy kontaktow z osobą prątkującą, badań obrazowych i mikrobiologicznych oraz znaczącą rolę lekarzy rodzinnych i pediatrow w tym procesie. Ze względu na narastające zjawisko oporności prątkow na leki (według WHO ogolna liczba przypadkow MDR-TB i XDR-TB na świecie wśrod nowo zdiagnozowanych przypadkow w 2012 roku wynosiła 450 tys.) poruszają problematykę gruźlicy wielolekoopornej, zasady prowadzenia leczenia oraz stosowane leki.
    Źródło:
    Pediatria i Medycyna Rodzinna; 2014, 10, 2; 111-127
    1734-1531
    2451-0742
    Pojawia się w:
    Pediatria i Medycyna Rodzinna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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