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Wyszukujesz frazę "p-glycoprotein" wg kryterium: Temat


Wyświetlanie 1-6 z 6
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:
The location of fusion protein AUX1-YFP in a transgenic callus of Arabidopsis thaliana
Autorzy:
Fautynowicz, L.
Tretyn, A.
Wisniewska, J.
Powiązania:
https://bibliotekanauki.pl/articles/951189.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fusion protein
auxin
Arabidopsis thaliana
P-glycoprotein
indole-3-acetic acid
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of intracellular idarubicin and daunorubicin levels on drug cytotoxicity in childhood acute leukemia.
Autorzy:
Styczyński, Jan
Wysocki, Mariusz
Dębski, Robert
Kurylak, Andrzej
Balwierz, Walentyna
Rokicka-Milewska, Roma
Matysiak, Michał
Balcerska, Anna
Kowalczyk, Jerzy
Wachowiak, Jacek
Sońta-Jakimczyk, Danuta
Chybicka, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/1043814.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
P-glycoprotein
acute myeloblastic leukemia
anthracyclines
acute lymphoblastic leukemia
drug resistance
Opis:
Uptake and efflux of two anthracyclines, idarubicin (IDA) and daunorubicin (DNR), was studied in childhood acute leukemia samples. A comparison of IDA and DNR transport phenomena in relation to drug cytotoxicity and expression of P-glycoprotein (PGP) was made. Intracellular content of IDA/DNR was determined by flow cytometry using the fluorescent properties of the drugs. In vitro drug cytotoxicity was measured by the 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide (MTT) assay. PGP expression was analysed by flow cytometry. The uptake and efflux rates were non-significantly higher for IDA than DNR. There were no differences between three types of leukemia with respect to drug content during accumulation and retention. After correction for the cell volume, intracellular concentration of both drugs in each moment of uptake and efflux was significantly lower in relapsed ALL and AML samples in comparison with initial ALL cells. Efflux, but not uptake, of both drugs was inversely correlated with PGP expression and IDA, but not DNR, cytotoxicity. The cytotoxicity was correlated with drug accumulation for both drugs and with drug retention for IDA. In conclusion, it seems that (1) intracellular content was related to the lipophilic properties of the drugs rather than to the type of leukemia, (2) decreased intracellular concentration of both drugs might have an impact on compromised therapy results in AML and relapsed ALL children, (3) IDA presents higher cytotoxicity, which possibly might be decreased by the presence of PGP. These results might have a practical impact on the rational design of new chemotherapy protocols.
Źródło:
Acta Biochimica Polonica; 2002, 49, 1; 99-107
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Targeting drug-efflux pumps - a pharmacoinformatic approach
Autorzy:
Pleban, Karin
Kaiser, Dominik
Kopp, Stefan
Peer, Michael
Chiba, Peter
Ecker, Gerhard
Powiązania:
https://bibliotekanauki.pl/articles/1041389.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
drug-efflux pumps
photoaffinity labeling
P-glycoprotein
self-organising maps
pharmacoinformatics
propafenone
Opis:
In line with our studies on propafenone-type inhibitors of P-glycoprotein (P-gp), we applied several methods to approach virtual screening tools for identification of new P-gp inhibitors on one hand and the molecular basis of ligand-protein interaction on the other hand. For virtual screening, a combination of autocorrelation vectors and selforganising artificial neural networks proved extremely valuable in identifying P-gp inhibitors with structurally new scaffolds. For a closer view on the binding region for propafenone-type ligands we applied a combination of pharmacophore-driven photoaffinity labeling and protein homology modeling. On LmrA, a bacterial homologue of P-gp, we were able to identify distinct regions on transmembrane helices 3, 5 and 6 which show significant changes in the labeling pattern during different steps of the catalytic cycle.
Źródło:
Acta Biochimica Polonica; 2005, 52, 3; 737-740
0001-527X
Pojawia się w:
Acta Biochimica Polonica
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:
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
    Wyświetlanie 1-6 z 6

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