Role of cell cycle control in radiosensitization of mouse spermatogonial stem cells.

Abstract:

PURPOSE:To investigate the possible role of cell cycle arrest in the radiosensitization of mouse spermatogonial stem cells due to small conditioning X-ray exposures. MATERIALS AND METHODS:A 24 h fractionation interval between conditioning (1 Gy) and challenging (8 or 9 Gy) exposures was used. Two approaches were followed: the first in the Swiss random-bred wild-type mouse of the radiation-induced cell cycle arrest-evading agents 3-aminobenzamide (3-AB) and caffeine; and, second, using the C57BL/6 mouse of different p53 status. As biological parameter stem cell survival was analysed by the repopulation index (RI) method and chromosomal translocations were recorded using spermatocyte analysis at appropriate posttreatment periods. RESULTS:In the Swiss wild-type mouse, the application of 3-AB or caffeine significantly suppressed the sensitization of stem cells towards killing or translocation induction. In the C57BL/6 mouse, somewhat more variability in response was observed but no significant differences in sensitization between the p53 +/+, +/- or -/- mouse were recorded, suggesting no involvement of p53 in this process. CONCLUSIONS:The results indicate that p53-independent cell cycle regulation plays an important role in the radiosensitization of mouse spermatogonial stem cells.

journal_name

Int J Radiat Biol

authors

Van Buul PP,Van Duyn-Goedhart A,Beumer T,Bootsma AL

doi

10.1080/09553000010009035

subject

Has Abstract

pub_date

2001-03-01 00:00:00

pages

357-63

issue

3

eissn

0955-3002

issn

1362-3095

journal_volume

77

pub_type

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