Genotoxicity and immunogenicity of DNA-advanced glycation end products formed by methylglyoxal and lysine in presence of Cu2+

被引:107
作者
Ahmad, Saheem [1 ]
Moinuddin [1 ]
Dixit, Kiran [1 ]
Shahab, Uzma [1 ]
Alam, Khursheed [1 ]
Ali, Asif [1 ]
机构
[1] AMU, Dept Biochem, Fac Med, Aligarh, Uttar Pradesh, India
关键词
DNA; Methylglyoxal; Advance glycation end products (AGES); Mutagenicity; Immunogenicity; PREFERENTIAL RECOGNITION; MAILLARD REACTION; ESCHERICHIA-COLI; SERUM-ALBUMIN; PEROXYNITRITE; PROTEIN; DAMAGE; DISEASE;
D O I
10.1016/j.bbrc.2011.03.064
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The highly reactive electrophile, methylglyoxal (MG), a break down product of carbohydrates, is a major environmental mutagen having potential genotoxic effects. Previous studies have suggested the reaction of MG with free amino groups of proteins forming advanced glycation end products (AGEs). This results in the generation of free radicals which play an important role in pathophysiology of aging and diabetic complications. MG also reacts with free amino group of nucleic acids resulting in the formation of DNA-AGEs. While the formation of nucleoside AGEs has been demonstrated previously, no extensive studies have been performed to assess the genotoxicity and immunogenicity of DNA-AGEs. In this study we report both the genotoxicity and immunogenicity of AGEs formed by MG-Lys-Cu2+ system. Genotoxicity of the experimentally generated AGEs was confirmed by comet-assay. Spectroscopical analysis and melting temperature studies suggest structural perturbations in the DNA as a result of modification. This might be due to generation of single-stranded regions and destabilization of hydrogen bonds. Immunogenicity of native and MG-Lys-Cu2+-DNA was probed in female rabbits. The modified DNA was highly immunogenic eliciting high titre immunogen specific antibodies, while the unmodified form was almost non-immunogenic. The results show structural perturbations in MG-Lys-Cu2+-DNA generating new epitopes that render the molecule immunogenic. (C) 2011 Elsevier Inc. All rights reserved.
引用
收藏
页码:568 / 574
页数:7
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