Interstitial chromatin alteration causes persistent p53 activation involved in the radiation-induced senescence-like growth arrest.

Abstract:

:Various stresses including ionizing radiation give normal human fibroblasts a phenotype of senescence-like growth arrest (SLGA), manifested by p53-dependent irreversible G1 arrest. To determine the mechanism of persistent activation of p53, we examined phosphorylated Ataxia telangiectasia mutated (ATM) and phosphorylated histone H2AX foci formation after X-irradiation. Although the multiple tiny foci, detected soon after (<30 min) irradiation, gradually disappeared, some of these foci changed to large foci and persisted for 5 days. Large foci containing phosphorylated ATM and gamma-H2AX co-localized and foci with p53 phosphorylated at serine 15 also showed the same distribution. Interestingly, the signals obtained by telomere fluorescence in situ hybridization (FISH) assay did not co-localize with 90% of the large foci. Our results indicate that chromatin alteration in interstitial chromosomal regions is the most likely cause of continuous activation of p53, which results in the induction of SLGA by ionizing radiation.

authors

Suzuki M,Suzuki K,Kodama S,Watanabe M

doi

10.1016/j.bbrc.2005.11.167

subject

Has Abstract

pub_date

2006-02-03 00:00:00

pages

145-50

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)02693-8

journal_volume

340

pub_type

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