Effects of thyroxine on rat brown fat and muscle thermogenesis in the cold.

Abstract:

:We studied whether the activation of rat brown adipose tissue (BAT) by cold exposure or by the administration of beta-3-noradrenergic agonist CGP-12177 could be prevented by the inhibition of thyroxine (T4) to triiodothyronine (T3) conversion. Hypothyroid rats were treated with replacement doses of T4, T4 plus iopanoic acid (IA) or T3. Groups of rats were placed at 4 degrees C for 24 h or kept at room temperature. Cold exposure induced a significant increase in guanosine diphosphate (GDP) binding to BAT mitochondrial proteins in T4-treated rats, an effect not abolished by IA. No significant changes were seen in T3-treated rats. In rats maintained at room temperature and injected with CGP-12177, T4 induced a significant rise in GDP binding which was not blocked by IA. T3 also induced a significant increase in binding. The study of mitochondrial oxygen consumption in muscle from cold-exposed rats showed a marked decrease in consumption in T3-treated rats as compared to values in the warm. Normal oxygen consumption was restored with 2-fold doses of T3 replacement, whereas 5-fold doses increased consumption above normal. The data suggest that in states with low or absent T3, T4 can stimulate heat production and preserve normothermia.

journal_name

Endocr Res

journal_title

Endocrine research

authors

Zaninovich AA,Rebagliati I,Raíces M,Ricci C,Hagmüller K

doi

10.3109/07435800009066164

subject

Has Abstract

pub_date

2000-05-01 00:00:00

pages

231-45

issue

2

eissn

0743-5800

issn

1532-4206

journal_volume

26

pub_type

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