Inhibition of crystallin expression and induction of apoptosis by lens-specific E1A expression in transgenic mice.

Abstract:

:Previous studies have shown that the adenovirus E1A oncoprotein can bind to and inactivate the retinoblastoma tumor suppressor protein (pRb) and the transcriptional coactivators CBP/p300. In this study, wild-type E1A12S or two deletion mutants (delN, which binds pRb but not CBP/p300; delCR2, which binds to CBP/p300 but not pRb) were linked to the lens-specific alphaA-crystallin promoter, and used to generate transgenic mice. Lens fiber cells expressing E1A12S or delCR2, both of which bind to CBP/p300, failed to upregulate beta-crystallin and gamma-crystallin expression. In contrast, lens fiber cells expressing delN showed significant expression of beta- and gamma-crystallins. Lens fiber cells expressing delN showed cell cycle entry, marked apoptosis, and evidence for p53 activation, while cells expressing either 12S or delCR2 showed limited apoptosis and no evidence for upregulation of the p53-inducible gene p21. Our results suggest that the transcriptional coactivators CBP and/or p300 are required for the dramatic increases in crystallin expression that accompany terminal differentiation in the lens, and also for activation of p53 in response to inactivation of pRb in the lens.

journal_name

Oncogene

journal_title

Oncogene

authors

Chen Q,Ash JD,Branton P,Fromm L,Overbeek PA

doi

10.1038/sj.onc.1205050

subject

Has Abstract

pub_date

2002-02-07 00:00:00

pages

1028-37

issue

7

eissn

0950-9232

issn

1476-5594

journal_volume

21

pub_type

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