Effects of exposure temperature on brown adipose tissue uncoupling protein mRNA levels.
BIOCHEMISTRY AND CELL BIOLOGY-BIOCHIMIE ET BIOLOGIE CELLULAIRE(2011)
Abstract
The effect of temperature on the amount of uncoupling protein mRNA in rat brown adipose tissue was examined after 1 and 14 days of exposure to cold. The relative amounts after 1 day, compared with rats kept at a thermoneutral temperature of 28 degrees C, were 3.2 at 19 degrees C, 3.3 at 11 degrees C, and 2.1 at 3 degrees C. This suggests that in warm-acclimated rats, a maximal response to a cold stimulus in brown adipose tissue is reached by 19 degrees C. In contrast to these results, the relative amounts of uncoupling protein mRNA after 14 days of cold exposure, compared with rats left at 28 degrees C, were 1.2 at 19 degrees C, 1.9 at 11 degrees C, and 2.1 at 3 degrees C. Since it is known that the amount of uncoupling protein in cold-acclimated rats increases continuously with decrease in temperature, the amount of protein reflects the mRNA levels during later times but not the initial time of exposure to cold.
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Key words
Adaptive Thermogenesis,Brown Adipose Tissue
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