Multiple abnormalities of the p16INK4a-pRb regulatory pathway in cultured melanoma cells.

Abstract:

:The retinoblastoma protein (pRb) pathway is critical in regulating the G1 phase of the cell cycle and it is frequently disrupted in human cancers. Components of the pRb pathway which are often altered in tumour progression include the INK4 cyclin-dependent kinase (CDK) inhibitors p16INK4a/ CDKN2A and p15INK4b/CDKN2B, CDK4, D-type cyclins and pRb. Several of these components were studied in a series of cultured melanoma cell lines in order to determine the frequency and spectrum of genetic alterations and to define targets for potential gene transfer studies. Also studied were the p16INK4a alternate transcript (p14ARF) and the p21(waf1) CDK inhibitor. The majority of the melanoma cell lines tested (13 out of 17; 76%) carried mutated (two), deleted (nine) or silenced (two) p16(INK4a). CDK4 was mutated or overexpressed in two melanoma cell lines with homozygously deleted CDKN2A and CDKN2B genes. This suggests that the selective growth advantages afforded by CDKN2A inactivation and CDK4 insensitivity are distinct and may involve the mediation of other CDK inhibitors or CDKs.

journal_name

Melanoma Res

journal_title

Melanoma research

authors

Rizos H,Darmanian AP,Indsto JO,Shannon JA,Kefford RF,Mann GJ

doi

10.1097/00008390-199902000-00003

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

10-9

issue

1

eissn

0960-8931

issn

1473-5636

journal_volume

9

pub_type

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