Inhibition of corticosterone secretion by thyroxine in male rats

Yen Hao Chen, Ming Jae Lo, Mei Mei Kau, Shiow Chwen Tsai, Yu Chung Chiao, Jiann Jong Chen, Charlie Liaw, Chien Chen Lu, Bu Pian Lee, Si Chih Chen, Victor S. Fang, Low Tone Ho, Paulus S. Wang

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The effects of thyroxine (T 4 ) on the secretion of corticosterone both in vivo and in vitro in male rats were studied. Rats were thyroidectomized (Tx) or sham Tx. The Tx rats were subcutaneously with T 4 (20 μg/kg) or saline once daily for two weeks. In an in vitro experiment, adrenal glands were incubated with ACTH, T 4 , or ACTH plus T 4 in the presence or absence of 0.5 mM 3-isobutyl-1-methylxanthine (IBMX) at 37°C for 60 min. Medium and ether-extracted plasma samples samples were analyzed for corticosterone by radioimmunoassay (RIA). The accumulation of cyclic adenosine monophosphate (cAMP) in adrenal tissues after incubation with IBMX was measured by RIA. The levels of plasma corticosterone in Tx rats were significantly increased as compared with euthyroid rats. T 4 replacement in Tx rats restored plasma corticosterone to euthyroid level. Administration of T 4 in vitro resulted in an inhibition of both basal and ACTH-stimulated release of corticosterone. Both basal and ACTH-stimulated generations of cAMP in adrenal tissues were decreased by T 4 . These results suggest that T 4 inhibits the spontaneous and ACTH-stimulated secretion of corticosterone by acting directly at adrenal glands via a decrease in cAMP production.

Original languageEnglish (US)
Pages (from-to)25-30
Number of pages6
JournalChinese Journal of Physiology
Volume40
Issue number1
StatePublished - Jan 1 1997

Fingerprint

Corticosterone
Thyroxine
Adrenocorticotropic Hormone
Cyclic AMP
Adrenal Glands
Radioimmunoassay
1-Methyl-3-isobutylxanthine
Ether
In Vitro Techniques

Keywords

  • T
  • adrenal
  • cAMP
  • corticosterone
  • in vitro
  • plasma

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Chen, Y. H., Lo, M. J., Kau, M. M., Tsai, S. C., Chiao, Y. C., Chen, J. J., ... Wang, P. S. (1997). Inhibition of corticosterone secretion by thyroxine in male rats. Chinese Journal of Physiology, 40(1), 25-30.

Inhibition of corticosterone secretion by thyroxine in male rats. / Chen, Yen Hao; Lo, Ming Jae; Kau, Mei Mei; Tsai, Shiow Chwen; Chiao, Yu Chung; Chen, Jiann Jong; Liaw, Charlie; Lu, Chien Chen; Lee, Bu Pian; Chen, Si Chih; Fang, Victor S.; Ho, Low Tone; Wang, Paulus S.

In: Chinese Journal of Physiology, Vol. 40, No. 1, 01.01.1997, p. 25-30.

Research output: Contribution to journalArticle

Chen, YH, Lo, MJ, Kau, MM, Tsai, SC, Chiao, YC, Chen, JJ, Liaw, C, Lu, CC, Lee, BP, Chen, SC, Fang, VS, Ho, LT & Wang, PS 1997, 'Inhibition of corticosterone secretion by thyroxine in male rats', Chinese Journal of Physiology, vol. 40, no. 1, pp. 25-30.
Chen YH, Lo MJ, Kau MM, Tsai SC, Chiao YC, Chen JJ et al. Inhibition of corticosterone secretion by thyroxine in male rats. Chinese Journal of Physiology. 1997 Jan 1;40(1):25-30.
Chen, Yen Hao ; Lo, Ming Jae ; Kau, Mei Mei ; Tsai, Shiow Chwen ; Chiao, Yu Chung ; Chen, Jiann Jong ; Liaw, Charlie ; Lu, Chien Chen ; Lee, Bu Pian ; Chen, Si Chih ; Fang, Victor S. ; Ho, Low Tone ; Wang, Paulus S. / Inhibition of corticosterone secretion by thyroxine in male rats. In: Chinese Journal of Physiology. 1997 ; Vol. 40, No. 1. pp. 25-30.
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