Photoperiod and pinealectomy do not affect cold-induced deposition of brown adipose tissue in the long-evans rat

K. S. Kott, Barbara A Horwitz

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Brown adipose tissue is a major thermogenic effector of cold-induced nonshivering thermogenesis. Previous studies indicate that melatonin and/or short photo-period are involved in the increase in brown fat deposition seen in certain cold-acclimated rodents. The present study was undertaken, in part, to determine whether the pineal is a necessary component in the cold-induced increase in thermogenic capacity characteristic of the cold-acclimated laboratory rat. Under a 12L:12D light cycle, pinealectomized rats did not differ from sham-operated rats in their ability to increase brown fat deposition in the cold (5 °C). Moreover, in a subsequent set of experiments performed at 9 °C, intact rats maintained at a short photoperiod (9L:15D) exhibited the same degree of brown fat hypertrophy/hyperplasia as did those kept at a long photoperiod (15L:9D). These data thus indicate that: (a) the intact pineal is not necessary for the cold-induced increase in brown adipose tissue occurring in the cold-acclimated rat; and (b) photoperiod does not significantly modulate the magnitude of this increase.

Original languageEnglish (US)
Pages (from-to)100-105
Number of pages6
JournalCryobiology
Volume20
Issue number1
DOIs
StatePublished - 1983

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Long Evans Rats
Brown Adipose Tissue
brown adipose tissue
Photoperiod
Rats
photoperiod
Tissue
rats
Fats
Melatonin
Thermogenesis
melatonin
heat production
pinealectomy
hypertrophy
hyperplasia
Hypertrophy
Hyperplasia
Rodentia
rodents

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

Photoperiod and pinealectomy do not affect cold-induced deposition of brown adipose tissue in the long-evans rat. / Kott, K. S.; Horwitz, Barbara A.

In: Cryobiology, Vol. 20, No. 1, 1983, p. 100-105.

Research output: Contribution to journalArticle

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