Growth hormone regulates growth hormone receptor gene transcription in primary human thyroid cells

Mullis, PE; O'Donovan, N; Eblé, A; Marti, U; Diem, P; Bürgi, U; Peter, HJ (2000). Growth hormone regulates growth hormone receptor gene transcription in primary human thyroid cells. Molecular and cellular endocrinology, 166(2), pp. 111-9. Shannon: Elsevier Ireland 10.1016/S0303-7207(00)00272-0

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In this study the regulation of GH-receptor gene (GHR/GHBP) transcription by different concentrations of GH (0, 12.5, 25, 50, 150, 500 ng/ml) with and without variable TSH concentrations (0.5, 2, 20 mU/l) in primary human thyroid cells cultured in serum-free hormonally-defined medium was studied. The incubation time was 6 h and GHR/GHBP mRNA expression was quantitatively assessed by using PCR amplification at hourly intervals. Correlating with the GH-concentrations added a constant and significant increase of GHR/GHBP gene transcription was found. After the addition of 12.5 ng/ml GH, GHR/GHBP mRNA concentration remained constant over the incubation period of 6 h but in comparison with the experiments where no GH was added there was a significant change of GHR/GHBP mRNA expression. Following the addition of 25 ng/ml GH a slight but further increase of GHR/GHBP transcription products was seen which increased even more in the experiments where higher GH concentrations were used. These data focusing on GHR/GHBP gene transcription derived from cDNA synthesis and quantitative PCR amplification were confirmed by run-on experiments. Furthermore, cycloheximide did not affect these changes supporting the notion that GH stimulates GHR/GHBP gene transcription directly. In a second set of experiments, in combination with variable TSH levels, identical GH concentrations were used and no difference in either GHR/GHBP mRNA levels or in transcription rate (run-on experiments) could be found. In conclusion, we report data showing that primary thyroid cells express functional GH-receptors in which GH has a direct and dose dependent effect on the GHR/GHBP gene transcription. Furthermore, TSH does not a have a major impact on GHR/GHBP gene regulation.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Endocrinology, Diabetology and Clinical Nutrition 04 Faculty of Medicine > Department of General Internal Medicine (DAIM) > Clinic of General Internal Medicine
UniBE Contributor:	Diem, Peter, Bürgi, Ulrich
ISSN:	0303-7207
ISBN:	10996429
Publisher:	Elsevier Ireland
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:56
Last Modified:	05 Dec 2022 14:17
Publisher DOI:	10.1016/S0303-7207(00)00272-0
PubMed ID:	10996429
Web of Science ID:	000089534100004
URI:	https://boris.unibe.ch/id/eprint/23867 (FactScience: 44872)