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Wyświetlanie 1-8 z 8
Tytuł:
Comparative proteomic analysis of Bombyx mori hemolymph and fat body after calorie restriction
Autorzy:
Chen, Huiqing
Li, Yijia
Chen, Keping
Yao, Qin
Li, Guohui
Wang, Lin
Powiązania:
https://bibliotekanauki.pl/articles/1040312.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
calorie restriction
Bombyx mori
two-dimensional gel electrophoresis
proteomic analysis
MALDI-TOF/TOF MS
Opis:
Calorie restriction (CR) is known to extend life span from yeast to mammals. To gain an insight into the effects of CR on growth and development of the silkworm Bombyx mori at protein level, we employed comparative proteomic approach to investigate proteomic differences of hemolymph and fat body of the silkworm larvae subjected to CR. Thirty-nine differentially expressed proteins were identified by MALDI TOF/TOF MS. Among them, 19 were from the hemolymph and 20 from the fat body. The hemolymph of the CR group contained two down-regulated and 17 up-regulated proteins, whereas the fat body contained 15 down-regulated and five up-regulated ones. These proteins belonged to those functioning in immune system, in signal transduction and apoptosis, in regulation of growth and development, and in energy metabolism. Our results suggest that CR can alter the expression of proteins related to the above four aspects, implying that these proteins may regulate life span of the silkworm through CR.
Źródło:
Acta Biochimica Polonica; 2010, 57, 4; 505-511
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Localization of the attachment site of oligoglucans to Mesorhizobium loti HAMBI 1148 murein
Autorzy:
Karaś, Magdalena
Russa, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/1040650.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
oligoglucan
murein
MALDI-TOF
deamination
Mesorhizobium
Opis:
The location and nature of the linkage between peptidoglycan and oligoglucans in the cell wall of Mesorhizobium loti HAMBI 1148 have been defined by the analysis of nitrous acid deamination of peptidoglycan glucosaminyl residues. The MurNH2-Glcn fraction was obtained after converting deaminoacylated and N-deacetylated muramyl residues in the cell wall preparation to lactam forms which were stable during subsequent deamination, followed by reduction and opening of the lactams. GC/MS analysis of this material, subjected to partial hydrolysis and reduction or to methanolysis followed by peracetylation, confirmed the presence of glucosyl residues glycosidically attached to muramic acid. The MALDI-TOF spectroscopic analysis of the deaminated material also revealed the presence of [M-H]- or [M+Na-2H]- ions representing fragments containing muramic acid with one to three linked glucose residues. The analysis of fully methylated neutral oligosaccharides released from the peptidoglycan with lysozyme followed by borohydride reduction showed the presence of di- and trisaccharides lacking the reducing end.
Źródło:
Acta Biochimica Polonica; 2009, 56, 1; 155-160
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of nanosilver addition on element ions release form light-cured dental composite and compomer into 0.9% NaCl
Autorzy:
Sokołowski, Krzysztof
Szynkowska, Małgorzata
Pawlaczyk, Aleksandra
Łukomska-Szymańska, Monika
Sokołowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1039296.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
dental composites
dental compomer
nanosilver
ion release
ICP-ToF-MS
Opis:
The aim of this paper was to identify and to assess in semi-quantified way the release of different ions from composite and compomer restorative materials subjected to 0.9% NaCl solution, which simulates the environment of the human body. In the present study, the number of ions (Al, Ag, Ba, Sr, Ti) released from dental fillings over time (one week, one month and 3 months), in different temperatures (23°C, 37°C) and depending on the materials applied (unmodified/modified with nanosilver) was investigated. The results suggest that nanosilver addition influences directly on the process of metal ion releasing into 0.9% NaCl solution. The increase in the number of counts of metal ions was observed in the solutions in which samples modified with nanosilver were kept. Higher amount of metal ion release was observed for composite samples rather than for compomer materials. The study revealed that in general the number of released metal ions increases with the time of storage (for metal ions: Ti, Ba, Sr) and at higher temperature (Ag, Ti, Ba). Reverse tendency observed for silver ion release versus incubation time may be caused by the process of silver adsorption, which takes place on the surface of analyzed material and test-tube walls, where samples were incubated.
Źródło:
Acta Biochimica Polonica; 2014, 61, 2; 317-323
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of Mesorhizobium huakuii cyclic β-glucan.
Autorzy:
Choma, Adam
Komaniecka, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/1043423.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
OPG
NMR
cyclic β-glucan
Mesorhizobium huakuii
MALDI-TOF
osmoregulation
Opis:
Periplasmic and extracellular glucans of Mesorhizobium huakuii were isolated and characterized by compositional and MALDI-TOF analyses, as well as 1H and 13C NMR spectroscopy. It was shown that M. huakuii produces a cyclic β-glucan composed entirely of nonbranched glucose chains and unmodified by nonsugar substituents. The degree of polymerisation of the cyclic oligosaccharides was estimated to be in the range from 17 to 28. The most abundant glucan molecules contained 22 glucose residues. Glucose residues within the glucan were connected by β-(1,2) glycosidic linkages. The cyclic glucan produced by M. huakuii is quite similar to the periplasmic β-(1,2) glucans synthesized by Agrobacterium and Sinorhizobium genera. The synthesis of β-glucan in M. huakuii is osmoregulated and this glucan could function as an osmoprotectant in free living cells.
Źródło:
Acta Biochimica Polonica; 2003, 50, 4; 1273-1281
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of asparagine deamidation in a SOD1-based biosynthetic human insulin precursor by MALDI-TOF mass spectrometry
Autorzy:
Bierczyńska-Krzysik, Anna
Łopaciuk, Małgorzata
Pawlak-Morka, Renata
Stadnik, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/1039302.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
asparagine deamidation
insulin precursor
superoxide dismutase
peptide mass fingerprinting
MALDI-TOF MS
Opis:
A biosynthetic human insulin precursor displayed enhanced susceptibility to deamidation at one particular site. The present study was undertaken to monitor progress of precursor deamidation at successive manufacturing stages. MALDI-TOF/TOF MS in combination with controlled endoproteinase Glu-C and endoproteinase Asp-N proteolysis was used for rapid and unambiguous determination of deamidated residue within the investigated structure. Close inspection of isotopic distribution patterns of peptides resulting from enzymatic digestion enabled determination of distinct precursor forms occurring during the production process. Asn, Asp, isoAsp and succinimide derivatives of the amino acid at position 26 were unambiguously identified. These modifications are related to the leader peptide of a precursor encompassing amino acid sequence corresponding to that of superoxide dismutase [Cu-Zn] (SOD1 1, EC=1.15.1.1). Monitoring of precursor deamidation process at successive manufacturing stages revealed that the protein folding stage was sufficient for a prominent replacement of asparagine by aspartic and isoaspartic acid and the deamidated human insulin precursor constituted the main manufactured product. Conversion proceeded through a succinimide intermediate. Significant deamidation is associated with the presence of SNG motif and confirms results achieved previously on model peptides. Our findings highlight an essential role of the specific amino acid sequence on accelerated rate of protein deamidation. To our knowledge, this is the first time that such a dramatic change in the relative abundance of Asp and isoAsp resulting from protein deamidation process is reported.
Źródło:
Acta Biochimica Polonica; 2014, 61, 2; 349-357
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Desorption/ionization on silicon for small molecules: a promising alternative to MALDI TOF.
Autorzy:
Kraj, Agnieszka
Dylag, Tomasz
Gorecka-Drzazga, Anna
Bargiel, Sylwester
Dziuban, Jan
Silberring, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1043452.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
proteomics
porous silicon
catecholamines
peptides
DIOS
mass spectrometry
desorption/ionization
MALDI TOF
Opis:
A method has been developed for laser desorption/ionization of catecholamines from porous silicon. This methodology is particularly attractive for analysis of small molecules. MALDI TOF mass spectrometry, although a very sensitive technique, utilizes matrices that need to be mixed with the sample prior to their analysis. Each matrix produces its own background, particularly in the low-molecular mass region. Therefore, detection and identification of molecules below 400 Da can be difficult. Desorption/ionization of samples deposited on porous silicon does not require addition of a matrix, thus, spectra in the low-molecular mass region can be clearly readable. Here, we describe a method for the analysis of catecholamines. While MALDI TOF is superior for proteomics/peptidomics, desorption/ionization from porous silicon can extend the operating range of a mass spectrometer for studies on metabolomics (small organic molecules and their metabolites, such as chemical neurotransmitters, prostaglandins, steroids, etc.).
Źródło:
Acta Biochimica Polonica; 2003, 50, 3; 783-787
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proteomics approach to identify the differential protein level in cardiac muscle of diabetic rat
Autorzy:
Karthik, Dhanaraj
Vijayakumar, Ravichandran
Pazhanichamy, Kalailingam
Ravikumar, Sivanesan
Powiązania:
https://bibliotekanauki.pl/articles/1039290.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
diabetes mellitus
cardiac muscle proteome
2D electrophoresis
MALDI-TOF-MS
phylogenetic analysis
Opis:
Background: Cardiovascular proteomics investigation reveals the characterization and elucidation of the novel therapeutic targets and strategies to prevent the development of heart failure associated diabetic complication by using 2DE and MS. Methods: The experimental animals were made diabetic with a single intraperitoneal injection of alloxan (150 mg/kg of bw). Albino rats were randomly divided into four individual groups: Group-I control (n=6), group-II alloxan-induced diabetic rats, untreated (n=6), group-III (n=6) and group-IV (n=6) alloxan-induced diabetic rats were treated with aqueous and ethanolic extracts of Cynodon dactylon for 15 days, respectively. Animals were euthanized to collect the heart tissues and blood samples. 2DE sample preparation, gel running and staining (n=6: each groups) were performed at the same time to avoid variation. The result of six gel images from each group were analyzed and evaluated as one match set with 2D software (P<0.05). Results: The above experiment revealed two up-regulated proteins in group-II i.e. NTF4 and ETFB. Conclusions: NTF4 is a neuro-protective agent for neuro-degenerative diseases. It will prevent diabetic secondary complications, such as diabetic polyneuropathy and cardiomyopathy. ETFB is active in the mitochondria, the energy-producing centres in cells. It is clear from the experiment that because of up-regulation of ETFB more energy is availabile and the electron transfer for heart during diabetes is possible, what leads to reduce the oxidative stress and free-radical formation. The up-regulated proteins reduced CVD that occurred just before overt hyperglycaemia due to administration of C. dactylon. This approach established the preliminary reference map for decoding cellular mechanisms linked between pathogenesis CVD and diabetes.
Źródło:
Acta Biochimica Polonica; 2014, 61, 2; 285-293
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of lipid derivatives in Hep G2 cells
Autorzy:
Gdula-Argasińska, Joanna
Garbacik, Aneta
Tyszka-Czochara, Małgorzata
Woźniakiewicz, Michał
Paśko, Paweł
Czepiel, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1039495.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
human hepatocellular carcinoma cells HepG2
eicosapentaenoic acid
benzo(a)pyrene
isoprostanes
prostaglandins
UHPLC/MS-TOF method validation
Opis:
Metabolism of polyunsaturated fatty acids results in biosynthesis of mediators with different physiological effects. These metabolites include prostaglandins, prostacyclins, isoprostanes and others that are important signalling molecules and regulate a variety of physiological and pathophysiological processes including inflammation. Prostaglandins and isoprostanes are produced by either non-enzymatic lipid peroxidation or by enzyme-induced peroxidation (cyclooxygenases and lipoxygenases). They are used as biomarkers of oxidative stress. The aim of our study was to assess the effect of eicosapentaenoic acid (EPA) supplementation with added benzo(a)pyrene (BaP) on HepG2 cells by using a UHPLC/MS-TOF method. This rapid and simple method was developed for the identification, separation and quantification of 8-iPGF3α, PGF3α, 8-isoPGF2α and 5-iPF2α in cultured cells. The UHPLC/MS-TOF method was validated. The calculated limit of detection was in the range of 0.16-0.50 ng/mL, precision (% RSD): 1.2-2.1% and recoveries better than 88%. This method empowered qualitative and quantitative analysis of the selected individual prostaglandins derived from arachidonic acid and eicosapentaenoic acid from cell extracts.
Źródło:
Acta Biochimica Polonica; 2013, 60, 4; 811-815
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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