A Mos Oncogene-containing Retrovirus, Myeloproliferative Sarcoma Virus, Transforms Rat Thyroid Epithelial Cells and Irreversibly Blocks Their Differentiation Pattern

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 1985 Oct 1

PMID 2993656

Citations 14

Authors

A Fusco

G Portella

P P Di Fiore

M T Berlingieri

R Di Lauro

A B Schneider

G Vecchio

Affiliations

Soon will be listed here.

Abstract

Differentiated, cloned rat thyroid epithelial cells (424 cells) were infected with a wild-type and a temperature-sensitive strain of the myeloproliferative variant of the Moloney murine sarcoma virus. The thyroid cells were productively infected and transformed by both virus strains and displayed some of the typical properties of malignant cells, such as morphological changes, growth in soft agar, and in vivo tumorigenicity. The acquisition of the transformed phenotype by the virus-infected cells was accompanied by a loss of the typical differentiated features of the thyroid epithelium, such as thyroglobulin (TG) secretion, iodide uptake, and dependence for growth on six factors including thyrotropin, the physiological thyroid stimulator. TG mRNA could not be demonstrated in cells transformed by both viral strains, suggesting a block at the level of the TG gene transcription. While the transformed state of the cell clones infected with the temperature-sensitive strain could be reverted by shifting the cultures to the temperature nonpermissive for transformation (39 degrees C), no reversion of the differentiated functions took place after such a shift, showing that the v-mos oncogene irreversibly shuts off the differentiation of thyroid epithelial cells in vitro. These results demonstrate, for the first time, an oncogenic potential of the v-mos oncogene family towards differentiated epithelial cells in vitro.

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