Correlated abnormalities of transforming growth factor-β1 response and p53 expression in thyroid epithelial cell transformation

doi:10.1016/0303-7207(91)90255-Q

Molecular and Cellular Endocrinology

Volume 76, Issues 1–3, April 1991, Pages 13-21

https://doi.org/10.1016/0303-7207(91)90255-Q Get rights and content

Abstract

Using the thyroid follicular cell as a model for multi-stage carcinogenesis, we have investigated the role of two potential negative growth regulators (‘anti-oncogenes’) in epithelial tumour progression — transforming growth factor-β1 (TGFβ1) and p53.

Normal follicular cells, as expected, showed marked growth inhibition in response to TGFβ1. Adenoma cells were equally inhibited. In contrast, spontaneously and SV40-immortalised follicular cell lines showing features of malignant transformation (notably loss of growth factor dependence) had lost all responsiveness to TGFβ1, accompanied by a partial loss of its receptors.

p53 protein was below detectable limits in normal and in adenoma cells but in contrast very high levels were observed in all three transformed lines. In the SV40-immortalised cells, this was expected in view of the known stabilising effect of the viral large T protein. In the spontaneous line we found strong evidence for point mutation of p53, which is known to have the same effect. Both mechanisms result in loss of p53 tumour suppressor function despite increased protein content. We conclude that loss of inhibition by TGFβ and inactivation of p53 are important steps in in vitro immortalisation and/or in vivo tumour progression in human thyroid follicular cells, and speculate that p53 may mediate or be required for the inhibitory signal normally induced by TGFβ1.

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Correlated abnormalities of transforming growth factor-β1 response and p53 expression in thyroid epithelial cell transformation

Abstract

J. Biol. Chem.

Exp. Cell Res.

Cell

Cell

Lancet

Cell

Adv. Cancer Res.

Biochem. Biophys. Res. Commun.

Exp. Cell Res.

Mol. Cell. Endocrinol.

Exp. Cell Res.

Science

Oncogene

Oncogene

J. Virol.

Carcinogenesis

EMBO J.