کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2525364 | 1119608 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Immunohistochemical detection of N-homocysteinylated proteins in humans and mice Immunohistochemical detection of N-homocysteinylated proteins in humans and mice](/preview/png/2525364.png)
N-homocysteinylation of ɛ-amino group of protein lysine residues by homocysteine (Hcy) thiolactone has been implicated in vascular disease in humans. We have previously generated polyclonal rabbit anti-N-Hcy-protein IgG antibodies that specifically recognize the Nɛ-Hcy-Lys epitope on N-homocysteinylated proteins. The present work was undertaken to examine the utility of these antibodies for the immunohistochemical detection of N-homocysteinylated proteins in biological samples. We found that the rabbit antibody specifically detected N-Hcy-protein in a dot-blot assay, that the signal resulting from the reaction of the antibody with N-Hcy-protein depended on the amount of the antigen, and that the sensitivity of the assay was protein-dependent. The rabbit anti-N-Hcy-protein IgG also specifically detected Nɛ-Hcy-Lys epitopes in human tissues, as shown by positive immunohistochemical staining of myocardium and aorta samples from cardiac surgery patients, and a lack of staining when the antibody was pre-adsorbed with N-Hcy-albumin. We also observed increased immunohistochemical staining for N-Hcy-proteins in aortic lesions from ApoE−/− mice with hyperhomocysteinemia induced by a high methionine diet, relative to ApoE−/− mice fed a control chow diet. In conclusion, polyclonal rabbit anti-N-Hcy-protein antibody can detect and monitor N-homocysteinylated proteins in human and mouse tissues with good sensitivity and specificity.
Journal: Biomedicine & Pharmacotherapy - Volume 62, Issue 7, September 2008, Pages 473–479