Determination of dideoxyosone precursors of AGEs in human lens proteins

Journal article


Publication Details

Author(s): Linetsky M, Johar SK, Meltretter J, Padmanabha S, Parmar T, Vasavada AR, Pischetsrieder M, Nagaraj RH
Journal: Archives of Biochemistry and Biophysics
Publisher: Elsevier
Publication year: 2011
Volume: 514
Pages range: 16-26
ISSN: 0003-9861


Abstract


Dideoxyosones (DDOs) are intermediates in the synthesis of advanced glycation endproducts (AGEs), such as pentosidine and glucosepane. Although the formation of pentosidine and glucosepane in the human lens has been firmly established, the formation of DDOs has not been demonstrated. The aim of this study was to develop a reliable method to detect DDOs in lens proteins. A specific DDO trapping agent, biotinyl-diaminobenzene (3,4-diamino-N-(3-[5-(2- oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoyl]aminopropyl)benzamide) (BDAB) was added during in vitro protein glycation or during protein extraction from human lenses. In vitro glycated human lens protein showed strong reaction in monomeric and polymeric crosslinked proteins by Western blot and ELISA. Glycation of BSA in the presence of BDAB resulted in covalent binding of BDAB to the protein and inhibited pentosidine formation. Mass spectrometric analysis of lysozyme glycated in the presence of BDAB showed the presence of quinoxalines at lysine residues at positions K1, K33, K96, and K116. The ELISA results indicated that cataractous lens proteins contain significantly higher levels of DDO than non-cataractous lenses (101.9 ± 67.8 vs. 31.7 ± 19.5 AU/mg protein, p < 0.0001). This study provides first direct evidence of DDO presence in human tissue proteins and establishes that AGE crosslink synthesis in the human lens occurs via DDO intermediates. © 2011 Elsevier Inc. All rights reserved.



FAU Authors / FAU Editors

Meltretter, Jasmin Dr.
Lehrstuhl für Lebensmittelchemie (Henriette-Schmidt-Burkhardt Lehrstuhl)
Pischetsrieder, Monika Prof. Dr.
Lehrstuhl für Lebensmittelchemie (Henriette-Schmidt-Burkhardt Lehrstuhl)


Additional Organisation
Emil-Fischer-Zentrum (Emil Fischer Center)


How to cite

APA:
Linetsky, M., Johar, S.K., Meltretter, J., Padmanabha, S., Parmar, T., Vasavada, A.R.,... Nagaraj, R.H. (2011). Determination of dideoxyosone precursors of AGEs in human lens proteins. Archives of Biochemistry and Biophysics, 514, 16-26. https://dx.doi.org/10.1016/j.abb.2011.07.012

MLA:
Linetsky, Mikhail, et al. "Determination of dideoxyosone precursors of AGEs in human lens proteins." Archives of Biochemistry and Biophysics 514 (2011): 16-26.

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Last updated on 2018-19-04 at 02:43