Thyrotropin Controls Transcription of the Thyroglobulin Gene

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1984 Oct 1

PMID 6592596

Citations 27

Authors

B Van Heuverswyn

C Streydio

H Brocas

S Refetoff

J Dumont

G Vassart

Affiliations

Soon will be listed here.

Abstract

The availability of rat thyroglobulin cDNA clones was exploited to study the regulation of thyroglobulin gene transcription by thyrotropin (TSH). Groups of rats were subjected to treatments leading to reduction or increase in the rat serum TSH (rTSH) levels. Thyroid gland nuclei were isolated, incubated in vitro in the presence of 32P-labeled uridine triphosphate, and thyroglobulin transcripts were quantitated by hybridization to immobilized rat thyroglobulin cDNA clones. Transcription of the thyroglobulin gene was found to be very active in thyroid nuclei from control animals. It represented about 10% of total RNA polymerase II activity. Chronic hyperstimulation of the thyroid glands with endogenous rTSH was achieved in rats treated with the goitrogen propylthiouracil. No significant increase of thyroglobulin gene transcription could be measured in thyroid nuclei from these animals. On the contrary, a dramatic decrease in thyroglobulin gene transcription was observed in those animals in which endogenous rTSH levels had been suppressed by hypophysectomy or by the administration of triiodothyronine. Injection of exogenous bovine TSH in such animals readily restored transcriptional activity of the gene. Our results identify transcription as an important regulatory step involved in TSH action. They suggest that normal TSH levels induce close to maximal expression of the thyroglobulin gene but that continuous presence of TSH is required in order to maintain the gene in an activated state.

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