کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10739065 1046858 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Endogenous DNA damage clusters in human skin, 3-D model, and cultured skin cells
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی سالمندی
پیش نمایش صفحه اول مقاله
Endogenous DNA damage clusters in human skin, 3-D model, and cultured skin cells
چکیده انگلیسی
Clustered damages-two or more oxidized bases, abasic sites, or strand breaks on opposing DNA strands within a few helical turns-are formed in DNA by ionizing radiation. Clusters are difficult for cells to repair and thus pose significant challenges to genomic integrity. Although endogenous clusters were found in some permanent human cell lines, it was not known if clusters accumulated in human tissues or primary cells. Using high-sensitivity gel electrophoresis, electronic imaging, and number average length analysis, we determined endogenous cluster levels in DNA from human skin, a 3-D skin model, and primary cultured skin cells. DNA from dermis and epidermis of human skin contained extremely low levels of endogenous clusters (a few per gigabase). However, cultured skin fibroblasts and keratinocytes-whether in monolayer cultures or in 3-D model skin cultures-accumulated oxidized pyrimidine, oxidized purine, and abasic clusters. The levels of endogenous clusters were decreased by growing cells in the presence of selenium or by increasing cellular levels of Fpg protein, presumably by increasing processing of clustered damages. These results imply that the levels of endogenous clusters can be affected by the cells' external environment and their ability to deal with DNA damage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Free Radical Biology and Medicine - Volume 39, Issue 6, 15 September 2005, Pages 832-839
نویسندگان
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