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• W2003023259 abstract "During spermatogenesis, the radiosensitivity of testicular cells changes considerably. To investigate the molecular mechanism underlying these radiosensitivity differences, p21(Cip1/WAF1) expression was studied before and after irradiation in the adult mouse testis. P21(Cip1/WAF1) is a cyclin-dependent kinase inhibitor (CDI) and has a role in the G1/S checkpoint and differentiation. P21(Cip1/WAF1) expression was observed in the normal testis, using Western blotting analysis. After a dose of 4 Gy, but not after 0.3 Gy, an increase in p21(Cip1/WAF1) expression could be determined in whole testis lysates. To investigate which germ cells are involved in p21(Cip1/WAF1) protein expression, immunohistochemical analysis was performed on irradiated testis. In the normal testis a weak staining for p21(Cip1/WAF1) was found in pachytene spermatocytes in epithelial stage V up to step 5 spermatids. A dose of 4 Gy of X-irradiation resulted in a transient increase of p21(Cip1/WAF1) staining in these cells with a maximum at 6 hr post irradiation, despite the fact that the irradiation did not induce an increase in the number of apoptotic spermatocytes. When a dose of 0.3 Gy was given, no increase in p21(Cip1/WAF1) staining was observed. Using the TUNEL technique, a 10-fold increase in apoptotic spermatogonia was found after a dose of 4 Gy. However, no staining for p21(Cip1/WAF1) was observed in spermatogonia, suggesting that these cells do not undergo a p21(Cip1/WAF1)-induced G1 arrest prior to DNA repair or apoptosis. These data imply that p21(Cip1/WAF1) is a factor which could be important during the meiotic prophase in spermatocytes and repair mechanisms in these cells, but not in spermatogonial cell cycle delay or apoptosis induction. Mol. Reprod. Dev. 47:240–247, 1997. © 1997 Wiley-Liss, Inc." @default.
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• W2003023259 date "1997-07-01" @default.
• W2003023259 modified "2023-09-23" @default.
• W2003023259 title "P21(Cip1/WAF1) expression in the mouse testis before and after X irradiation" @default.
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• W2003023259 doi "https://doi.org/10.1002/(sici)1098-2795(199707)47:3<240::aid-mrd2>3.0.co;2-l" @default.
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