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The in vivo effects of beta-3-receptor agonist CGP-12177 on thyroxine deiodination in cold-exposed, sympathectomized

D Hofer¹, M Raíces, K Schauenstein

¹Department of Zoology, University of Graz, Austria.

European Journal of Endocrinology

|July 29, 2000

Summary

This summary is machine-generated.

The beta-3-receptor agonist CGP-12177 activates brown adipose tissue (BAT) thyroxine (T4) deiodination via beta-3 receptors. This study investigated CGP-12177

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Arteriovenous Metabolomics to Measure In Vivo Metabolite Exchange in Brown Adipose Tissue

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Published on: October 6, 2023

Area of Science:

Endocrinology
Metabolism
Pharmacology

Background:

Sympathectomy (SX) in rats affects thyroxine (T4) deiodination in brown adipose tissue (BAT).
The beta-3-adrenergic receptor plays a role in regulating BAT activity and energy expenditure.
Understanding T4 deiodination is crucial for metabolic research.

Purpose of the Study:

To investigate the effects of the beta-3-receptor agonist CGP-12177 on T4 deiodination in sympathectomized (SX) rat brown adipose tissue (BAT).
To determine the receptor subtypes involved in CGP-12177-mediated T4 deiodination.

Main Methods:

Wistar rats underwent sympathectomy (SX) and were treated with CGP-12177 or norepinephrine (NE) via pellet implantation or intraperitoneal injection.
Animals were exposed to cold (4°C) to stimulate BAT activity.
BAT homogenates were incubated with [(125)I]T4 to measure deiodination activity and identify subproducts.

Main Results:

CGP-12177 effectively restored T4 deiodination in SX BAT, with norepinephrine (NE) showing slightly greater efficacy.
Propranolol, a beta-blocker, inhibited the effects of CGP-12177, while prazosin, an alpha-blocker, did not.
NE-induced deiodination was partially blocked by both propranolol and prazosin.

Conclusions:

CGP-12177 stimulates in vivo activation of 5'-deiodinase type II activity in BAT.
This activation is mediated predominantly through beta-3 adrenergic receptors.
Alpha-1 adrenergic receptors do not appear to participate in the CGP-12177-induced T4 deiodination pathway.