Cellular factors may enable squamous carcinoma cells to overcome TGF beta-mediated repression of CDK2 activity.

Abstract:

:Cell lines developed from head and neck squamous cell carcinomas exhibit variable responses to the negative regulatory effects of transforming growth factor beta (TGF beta) on cell growth. To analyse the effects of TGF beta on regulators of cell cycle progression, we characterised cell lines derived from head and neck squamous cell carcinoma (HNSCC) for their biological sensitivities to TGF beta, growth inhibition, then examined the effects of TGF beta treatment on the expression and activity of cyclin dependent kinases (CDKs) and inhibitors of these kinases. Western blot analysis of cell lysates from untreated or TGF beta-treated cultures showed no alterations in expression of CDK2, CDK4, CDK6 or cyclin E in cell lines which were either sensitive (HaCaT, HN6) or refractory (HN12, HN30) to the growth-inhibitory effects of TGF beta. However, treatment of cells with TGF beta resulted in a several fold increase in cellular levels of p21 (WAF1/Cip1), irrespective of biological response. Immune complex in vitro kinase assays demonstrated that the activity of CDK2 was inhibited by exposure to ligand in each case, confirming that a TGF beta signalling pathway which regulates kinase activity was intact in these cell lines. The data suggest that cellular factors expressed in HN12 and HN30 enable these cells to override TGF beta-mediated inhibition of CDK2 activity and allow cell cycle progression. This may represent an important mechanism which allows cells to evade growth arrest during malignant progression.

journal_name

Oral Oncol

journal_title

Oral oncology

authors

Lesaca EE,Ensley JF,Yeudall WA

doi

10.1016/s1368-8375(97)00023-7

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

52-7

issue

1

eissn

1368-8375

issn

1879-0593

pii

S1368-8375(97)00023-7

journal_volume

34

pub_type

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