Inactivation of both Rb and p53 pathways in mouse lung epithelial cell lines.

Abstract:

:Aberrant expression of key cell cycle regulatory genes is essential for the immortalization and transformation of cells in vitro. We examined 20 mouse lung epithelial cell lines (2 nontumorigenic, 5 nonmetastatic, and 13 metastatic) for mutations or alterations in the expression of key components of the Rb pathway (pRb and p16INK4a) and the p53 pathway (p53 and p19ARF). Seven cell lines had a mutation in exons 5 to 8 of p53. p19ARF was inactivated in the remaining 13 cell lines, primarily by homozygous deletion. Rb expression was present and unaltered in all cell lines, with both phosphorylated and unphosphorylated protein forms detectable. p16INK4a transcripts were undetectable in all cell lines tested except LM1. Loss of p16INK4a expression was a result of homozygous deletion in 11 out of 20 lung cell lines and promoter-exon 1 hypermethylation in 6 out of the remaining 8 cell lines. Other related components that were examined in this study included p21WAF1 and cyclin D1. Compared to normal lung tissue, p21WAF1 expression levels were reduced or undetectable in all cell lines, which did not correlate with loss of p53 function, but did correlate with inactivation of either p53 or p19ARF. Although cyclin D1 expression was variable between cell lines, transcript levels were decreased by at least 50% in the nontumorigenic lines C10 and E10 compared to the tumorigenic cell lines. These results demonstrate mutually exclusive relationships between p53 and p19ARF and between Rb and p16INK4a, but perhaps not between cyclin D1 and p16INK4a, and further describe the nature of involvement of both pathways in mouse lung tumorigenesis.

journal_name

Exp Lung Res

authors

McDoniels-Silvers AL,Herzog CR,Tyson FL,Malkinson AM,You M

doi

10.1080/019021401300054064

subject

Has Abstract

pub_date

2001-04-01 00:00:00

pages

297-318

issue

3

eissn

0190-2148

issn

1521-0499

journal_volume

27

pub_type

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