کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2124829 1547278 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Increasing oxidative damage and loss of mismatch repair enzymes during breast carcinogenesis
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی تحقیقات سرطان
پیش نمایش صفحه اول مقاله
Increasing oxidative damage and loss of mismatch repair enzymes during breast carcinogenesis
چکیده انگلیسی

This study examined the expression of oxidative damage markers 8-hydroxydeoxyguanosine (8-OHdG), 4-hydroxy-2-nonenal (HNE) and nitrotyrosine using immunohistochemical techniques. In addition, DNA topoisomerase II binding protein 1 (TopBP1) and mismatch repair proteins 2 and 6 (MSH2 and MSH6) were immunostained in a series of 80 stage I invasive breast tumours, 26 in situ breast carcinomas and 12 benign breast hyperplasias. 8-OHdG, HNE and nitrotyrosine expression were considerably weaker in hyperplasias than in in situ lesions, which, in turn, showed less oxidative damage than T1N0 tumours. Hyperplasias and in situ tumours were all, at least moderately, positive for MSH2, and nearly all were positive for MSH6. Nitrotyrosine expression was associated with HNE (P < 0.0005) and 8-OHdG (P = 0.041) in the T1N0 cohort. To conclude, there is increasing oxidative stress during the early steps of breast carcinogenesis. On the other hand, a significant reduction in expression of mismatch repair proteins occurs during the progression of in situ lesions to invasive tumours.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Cancer - Volume 42, Issue 15, October 2006, Pages 2653–2659
نویسندگان
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