BACKGROUNDS: The relationship between DNA damage and glomerular fibrosis in renal allografts remains unclear. METHODS: We examined renal allograft specimens from 35 patients in which DNA double-strand breaks (DSBs) and glomerular fibrosis were detected by phospho-histone H2A.X (γ-H2AX) expression and collagen (COL) types III, IV, and VI accumulation. We also examined the in vitro relationship between DNA damage and COL accumulation by mitomycin C (MMc)-induced DNA damage in human glomerular endothelial cells (HRGEc). RESULTS: The γ-H2AX and COL type VI, which mainly accumulated in the subendothelial and mesangial regions, were positively correlated with the duration of the post-renal transplant (RT) period. In multiple regression analysis, the duration of the post-RT period and cg in the Banff '07 classification were identified as a significant predictor of COL type VI accumulation and γ-H2AX expression in the glomerular capillaries. In addition, the γ-H2AX-positive area was also identified as a predictor of glomerular accumulation of COL type VI. COL type VI was detected in the cytoplasm of the HRGEc, which was secreted into the supernatant after MMc stimulation with γ-H2AX expression. The number of γ-H2AX (-)/COL type VI (+) cells was inversely associated with the number of γ-H2AX (+)/COL type VI (-) cells during 24-h MMc treatment. CONCLUSIONS: Our findings suggest that the long-term RT induces DSBs and HRGEc-secreted COL type VI accumulation in the glomerular capillaries, which might progress to intractable glomerular fibrosis.
BACKGROUNDS: The relationship between DNA damage and glomerular fibrosis in renal allografts remains unclear. METHODS: We examined renal allograft specimens from 35 patients in which DNA double-strand breaks (DSBs) and glomerular fibrosis were detected by phospho-histone H2A.X (γ-H2AX) expression and collagen (COL) types III, IV, and VI accumulation. We also examined the in vitro relationship between DNA damage and COL accumulation by mitomycin C (MMc)-induced DNA damage in human glomerular endothelial cells (HRGEc). RESULTS: The γ-H2AX and COL type VI, which mainly accumulated in the subendothelial and mesangial regions, were positively correlated with the duration of the post-renal transplant (RT) period. In multiple regression analysis, the duration of the post-RT period and cg in the Banff '07 classification were identified as a significant predictor of COL type VI accumulation and γ-H2AX expression in the glomerular capillaries. In addition, the γ-H2AX-positive area was also identified as a predictor of glomerular accumulation of COL type VI. COL type VI was detected in the cytoplasm of the HRGEc, which was secreted into the supernatant after MMc stimulation with γ-H2AX expression. The number of γ-H2AX (-)/COL type VI (+) cells was inversely associated with the number of γ-H2AX (+)/COL type VI (-) cells during 24-h MMc treatment. CONCLUSIONS: Our findings suggest that the long-term RT induces DSBs and HRGEc-secreted COL type VI accumulation in the glomerular capillaries, which might progress to intractable glomerular fibrosis.
Authors: Arkady Celeste; Oscar Fernandez-Capetillo; Michael J Kruhlak; Duane R Pilch; David W Staudt; Alicia Lee; Robert F Bonner; William M Bonner; André Nussenzweig Journal: Nat Cell Biol Date: 2003-07 Impact factor: 28.824
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Authors: Weibin Zhou; Edgar A Otto; Andrew Cluckey; Rannar Airik; Toby W Hurd; Moumita Chaki; Katrina Diaz; Francis P Lach; Geoffrey R Bennett; Heon Yung Gee; Amiya K Ghosh; Sivakumar Natarajan; Supawat Thongthip; Uma Veturi; Susan J Allen; Sabine Janssen; Gokul Ramaswami; Joanne Dixon; Felix Burkhalter; Martin Spoendlin; Holger Moch; Michael J Mihatsch; Jerome Verine; Richard Reade; Hany Soliman; Michel Godin; Denes Kiss; Guido Monga; Gianna Mazzucco; Kerstin Amann; Ferruh Artunc; Ronald C Newland; Thorsten Wiech; Stefan Zschiedrich; Tobias B Huber; Andreas Friedl; Gisela G Slaats; Jaap A Joles; Roel Goldschmeding; Joseph Washburn; Rachel H Giles; Shawn Levy; Agata Smogorzewska; Friedhelm Hildebrandt Journal: Nat Genet Date: 2012-07-08 Impact factor: 38.330