Abstract:
:With multiple divisions in culture, normal diploid cells suffer a loss of growth potential that leads to replicative senescence and a finite replicative capacity. Using quantitative RT-PCR, we have monitored mRNA expression levels of c-fos, c-jun, JunB, c-myc, p53, H-ras, and histone H4 during the replicative senescence of human fibroblasts. The earliest and the largest changes in gene expression occurred in c-fos and junB at mid-senescence prior to the first slowing in cell growth rates. The basal level of c-fos mRNA decreased to one-ninth that of the early-passage levels, while junB declined to one-third and c-jun expression remained constant. The decline in the basal c-fos mRNA level in mid-senescence should lead to an increase in Jun/Jun AP-1 homodimers at the expense of Fos/Jun heterodimers and may trigger a cascade of further changes in c-myc, p53, and H-ras expression in late-passage senescent fibroblasts.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Irving J,Feng J,Wistrom C,Pikaart M,Villeponteau Bdoi
10.1016/0014-4827(92)90415-5keywords:
subject
Has Abstractpub_date
1992-09-01 00:00:00pages
161-6issue
1eissn
0014-4827issn
1090-2422pii
0014-4827(92)90415-5journal_volume
202pub_type
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