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Horm Metab Res 1982; 14(5): 261-265
DOI: 10.1055/s-2007-1018987
© Georg Thieme Verlag, Stuttgart · New York

Catecholamine and Thyroid Hormone Influence on Brown Fat Na+, K+-ATPase Activity and Thermogenesis in the Rat

N. J. Rothwell, M. E. Saville, M. J. Stock, M. G. Wyllie1
  • Department of Physiology, St. George's Hospital Medical School, Tooting, London, United Kingdom
  • 1Wyeth Institute of Medical Research, Maidenhead, United Kingdom
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Publication History

1981

1981

Publication Date:
23 April 2008 (online)

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Summary

Resting oxygen consumption (VO2) before and after injection of noradrenaline (NA), and plasma triiodothyronine levels were elevated in hyperthyroid and hyperphagic cafeteria fed rats, but were reduced in 4d-fasted and hypothyroid animals compared to controls. Refeeding fasted rats with a single carbohydrate meal caused all of these parameters to increase towards control levels. In vivo turnover, and in vitro release of NA brown adipose tissue (BAT) was elevated in cafeteria fed rats but remained unaltered in other groups and levels and uptake of NA in BAT were similar for all rats. Basal and NA stimulated Na+, K+-ATPase activity in BAT was increased in cafeteria and hyperthyroid rats and reduced in fasted and hypothyroid animals compared to control and refed groups. A highly significant correlation (r = 0.977), (P < 0.001), found between the in vitro activity of this enzyme and resting VO2 in all rats, indicates that BAT Na+, K+-ATPase may be involved in the thermogenic responses to diet, catecholamines and thyroid hormones.

Key-Words:

Diet-Induced Thermogenesis - Brown Adipose Tissue - Noradrenaline - Thyroid Hormones - Na+, K+-ATPase - Rats

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