scholarly journals Influence of Piracetam on Gliclazide—Glycated Human Serum Albumin Interaction. A Spectrofluorometric Study

Molecules ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 111 ◽  
Author(s):  
Agnieszka Szkudlarek ◽  
Jadwiga Pożycka ◽  
Małgorzata Maciążek-Jurczyk
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Glycated Albumin ◽  
Human Albumin ◽  
Protein Glycation ◽  
Monitoring Therapy ◽  
Glycation End Products ◽  
Local Accumulation

Advanced Glycation End-Products (AGEs) are created in the last step of protein glycation and can be a factor in aging and in the development or worsening of many degenerative diseases (diabetes, chronic kidney disease, atherosclerosis, Alzheimer’s disease, etc.). Albumin is the most susceptible to glycation plasma protein. Modified albumin by AGEs may be more resistant to enzymatic degradation, which further increases the local accumulation of AGEs in tissues. The aim of the present study was to analyze in vitro glycation of serum albumin in the presence of piracetam (PIR) and the gliclazide (GLZ)-glycated albumin interaction. The analysis of PIR as an inhibitor and GLZ interaction with nonglycated human albumin (HSA) and glycated by fructose human albumin (gHSAFRC), in the absence and presence of piracetam (gHSAFRC-PIR), was performed by fluorescence quenching of macromolecules. On the basis of obtained data we concluded that under the influence of glycation, association constant ( K a ) of gliclazide to human serum albumin decreases and GLZ binds to HSA with less strength than under physiological conditions. PIR strongly inhibited the formation of AGEs in the system where the efficiency of HSA glycation was the largest. The analysis of piracetam influence on the GLZ-glycated albumin interaction has shown that piracetam increases the binding strength of GLZ to glycated albumin and weakens its therapeutic effect. Based on the obtained data we concluded that monitoring therapy and precautions are required in the treatment when the combinations of gliclazide and piracetam are used at the same time.

scholarly journals A Biophysical Comparison of Human Serum Albumin to be Glycated In Vivo and In Vitro

2011 ◽  
Vol 30 (1) ◽  
pp. 5-10 ◽  
Author(s):  
Naghmeh Sattarahmady ◽  
Ali Moosavi-Movahedi ◽  
Mehran Habibi-Rezaei
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Physiological Conditions ◽  
Glycation End Products ◽  
Biophysical Studies ◽  
Arginine Residues ◽  
Glycation Process

A Biophysical Comparison of Human Serum Albumin to be GlycatedIn VivoandIn VitroThe glycation process includes the arrangement of proteins with chemically reversible early glycation products, Schiff bases and Amadori adducts. These early products endure slow and complex rearrangements to create advanced glycation end-products (AGEs) that are involved in diabetic complications. Here, the biophysical characteristics ofin vitroglycated human serum albumin (HSA) are compared to those of HSA glycatedin vivo. The changes in the content of α-helices, AGE-specific fluorescence intensity, extent of lysine residue modification, and surface tension value and also the formation of Amadori products in HSA are similar in both conditions. It was observed, however, that arginine residues were modified only under physiological conditions (in vivo), while the same did not occurin vitro. This difference was related to the presence of 3-deoxyglucosone, a 1,2-dicarbonyl compound derived from glucose under physiological conditions. Therefore, the biophysical studies on the HSA glycation processin vitroare credible.

Nof2206Probing the interaction of memantine, an important Alzheimer's drug, with human serum albumin: In silico and In vitro approach

2021 ◽  
pp. 116888
Author(s):  
Fahad A. Alhumaydhi ◽  
Mohammad Abdullah Aljasir ◽  
Abdullah S.M. Aljohani ◽  
Suliman A. Alsagaby ◽  
Ameen S.S. Alwashmi ◽  
...  
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
In Silico

scholarly journals Synthesis and In Vitro Assessment of pH-Sensitive Human Serum Albumin Conjugates of Pirarubicin

2020 ◽  
Vol 14 (1) ◽  
pp. 22
Author(s):  
Kenji Tsukigawa ◽  
Shuhei Imoto ◽  
Keishi Yamasaki ◽  
Koji Nishi ◽  
Toshihiko Tsutsumi ◽  
...  
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Coupling Reaction ◽  
Synthetic Polymer ◽  
Ph Sensitive ◽  
Acidic Ph ◽  
Polymer Conjugate ◽  
Acidic Conditions

In a previous study, we reported on the development of a synthetic polymer conjugate of pirarubicin (THP) that was formed via an acid-labile hydrazone bond between the polymer and the THP. However, the synthetic polymer itself was non-biodegradable, which could lead to unexpected adverse effects. Human serum albumin (HSA), which has a high biocompatibility and good biodegradability, is also a potent carrier for delivering antitumor drugs. The objective of this study was to develop pH-sensitive HSA conjugates of THP (HSA-THP), and investigate the release of THP and the cytotoxicity under acidic conditions in vitro for further clinical development. HSA-THP was synthesized by conjugating maleimide hydrazone derivatives of THP with poly-thiolated HSA using 2-iminothiolane, via a thiol-maleimide coupling reaction. We synthesized two types of HSA-THP that contained different amounts of THP (HSA-THP2 and HSA-THP4). Free THP was released from both of the HSA conjugates more rapidly at an acidic pH, and the rates of release for HSA-THP2 and HSA-THP4 were similar. Moreover, both HSA-THPs exhibited a higher cytotoxicity at acidic pH than at neutral pH, which is consistent with the effective liberation of free THP under acidic conditions. These findings suggest that these types of HSA-THPs are promising candidates for further development.

The in Vitro Anti-HIV Efficacy of Negatively Charged Human Serum Albumin Is Antagonized by Heparin

1997 ◽  
Vol 13 (8) ◽  
pp. 677-683 ◽  
Author(s):  
P.J. SWART ◽  
C.S. SUN ◽  
M.E. KUIPERS ◽  
C. ASUNCION ◽  
S. JOSEPHS ◽  
...  
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Anti Hiv

scholarly journals Kinetic study of the photochemical changes of (ZZ)-bilirubin IX α bound to human serum albumin. Demonstration of (EZ)-bilirubin IX α as an intermediate in photochemical changes from (ZZ)-bilirubin IX α to (EZ)-cyclobilirubin IX α

1985 ◽  
Vol 226 (1) ◽  
pp. 251-258 ◽  
Author(s):  
S Itoh ◽  
S Onishi
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Kinetic Study ◽  
Human Serum ◽  
Photochemical Reaction ◽  
Relative Rate ◽  
Significant Preference ◽  
Geometrical Isomers ◽  
Relative Rate Constants

The present study was performed to elucidate why the photochemical reaction of (ZZ)-bilirubin bound to human serum albumin is singularly selective, and only one of the two (EZ)- and (ZE)-bilirubins, the (ZE)-isomer, is produced. In a kinetic study of the photochemical reaction in vitro, the sum of the relative rate constants of photochemical transformation of (EZ)-bilirubin into both (EZ)-cyclobilirubin and (ZZ)-bilirubin, with a significant preference for the former, was proved to be considerably larger than that of the transformation of (ZZ)-bilirubin into (EZ)-bilirubin. Therefore only one of the geometrical isomers, namely (ZE)-bilirubin, is apparently formed. It was concluded that (EZ)-bilirubin photochemically undergoes (EZ)-cyclization, i.e. structural photoisomerization, while bound to its high-affinity site on human serum albumin, and is an intermediate in the transformation of (ZZ)-bilirubin into (EZ)-cyclobilirubin.

scholarly journals Partial non-cleavage by cyanogen bromide of a methionine–cystine bond from human serum albumin and bovine α-lactalbumin

1979 ◽  
Vol 177 (1) ◽  
pp. 251-254 ◽  
Author(s):  
N Doyen ◽  
C Lapresle
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Cyanogen Bromide ◽  
Human Albumin ◽  
Alpha Lactalbumin

When human albumin was treated with CNBr, a fragment designated D was obtained and attributed to the absence from some of the albumin molecules of methionine at position 123 [Lapresle & Doyen (1975) Biochem. J. 151, 637-643]. The present study shows that methionine-123 is converted into homoserine without cleavage of the subsequent methionine-cystine bond. With bovine alpha-lactalbumin, a further example of non-cleavage of a methionine-cystine bond with conversion of methionine into homoserine is reported.

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