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. 1988 Jan 15;249(2):451–457. doi: 10.1042/bj2490451

Regulation of GDP binding and uncoupling-protein concentration in brown-adipose-tissue mitochondria. The effects of cold-acclimation, warm-reacclimation and noradrenaline.

T Peachey 1, R R French 1, D A York 1
PMCID: PMC1148724  PMID: 3342023

Abstract

We have used a specific immunoassay for uncoupling protein and [3H]GDP binding to study the acute and chronic responses of brown-adipose-tissue (BAT) mitochondria of warm-acclimated rats to housing at 4 degrees C and cold-acclimated rats to housing at 27 degrees C. These studies have shown the following. (1) In the cold-exposed rat the increase in mitochondrial uncoupling-protein concentration parallels the increase in GDP binding from 1 day to 5 days, but that acutely (initial 4 h) the increase in GDP binding is not associated with any change in uncoupling-protein concentration. 2. In the cold-acclimated rat rehoused at 27 degrees C, GDP binding fell by over 50% in the first 2 days, without any change in uncoupling-protein concentrations. 3. Noradrenaline acutely (30 min) increased BAT mitochondrial GDP binding of lean and obese Zucker rats, without any change in uncoupling-protein concentrations. 4. The increases in GDP binding in cold-exposed rats were associated with increases in the rate of swelling of mitochondria in the presence of valinomycin and potassium acetate. The evidence supports the hypothesis that the acute response of the rat to changes in environmental temperature are associated with unmasking or remasking of uncoupling protein, whereas chronically changes in uncoupling-protein concentration predominate.

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Selected References

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