Effects of c-Jun and a negative dominant mutation of c-Jun on differentiation and gene expression in lens epithelial cells.

Abstract:

:We have used a retroviral vector (RCAS) to overexpress wild-type chicken c-Jun or a deletion mutant of chicken c-Jun (Jun delta 7) lacking the DNA binding region to investigate the possible role of c-Jun in lens epithelial cell proliferation and differentiation. Both constructs were efficiently expressed in primary cultures of embryonic chicken lens epithelial cells. Overexpression of c-Jun increased the rate of cell proliferation and greatly delayed the appearance of "lentoid bodies," structures which contain differentiated cells expressing fiber cell markers. Excess c-Jun expression also significantly decreased the level of beta A3/A1-crystallin mRNA, without affecting alpha A-crystallin mRNA. In contrast, the mutated protein, Jun delta 7, had no effect on proliferation or differentiation but markedly increased the level of alpha A-crystallin mRNA in proliferating cell cultures. These results suggest that c-Jun or Jun-related proteins may be negative regulators of alpha A- and beta A3/A1-crystallin genes in proliferating lens cells.

journal_name

J Cell Biochem

authors

Rinaudo JA,Vacchiano E,Zelenka PS

doi

10.1002/jcb.240580212

subject

Has Abstract

pub_date

1995-06-01 00:00:00

pages

237-47

issue

2

eissn

0730-2312

issn

1097-4644

journal_volume

58

pub_type

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