Effect of cold exposure on serum DBH and interscapular brown adipose tissue MAO activity in hypothyroid T3- and T4-treated rats

Annals of the New York Academy of Sciences
Gordana CvijicV M Petrović

Abstract

As the indicators of sympathetic nervous system (SNS) function, the activity of serum dopamine-beta-hydroxylase (DBH) and interscapular brown adipose tissue (IBAT) monoamine oxidase (MAO) were examined in rats that were chemically thyroidectomized (TX), treated with thyroid hormones, and exposed to cold (4 degrees C). In TX animals, body temperature (bt) significantly decreased, and relative IBAT mass increased as compared with control, euthyroid animals, independent of the ambient temperature. The bt fall in TX cold-exposed animals was more severe, provoking hypothermia after 4 h. Under the same experimental conditions, the SNS function was enhanced as judged by the increased serum DBH and IBAT MAO activities. The treatment of TX animals with T(4) and T(3) re-established the temperature (bt was at the level of controls) and sympathetic homeostasis (DBH activity was at the level of controls) in animals maintained at room temperature but not in those kept under cold conditions. T(4) and T(3) did not affect IBAT MAO activity of TX rats: It remained significantly above the control values whether the animals were maintained at room temperature or exposed to cold. In conclusion, the IBAT of TX cold-exposed rats is incapable of respo...Continue Reading

Citations

Jun 27, 2013·The British Journal of Nutrition·Rosario Ayala-MorenoLucía Quevedo
Oct 22, 2020·American Journal of Perinatology·Morgan R PeltierDarios Getahun

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