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Cold exposure as a potentiating factor of pineal actions in nonhibernating mammals.

Abstract：

:Twenty-eight-day-old male rats were used in three experiments to study whether cold exposure potentiates pineal actions in nonhibernating mammals. The following questions were considered: (a) Can cold exposure increase the antigonadal effects of light deprivation? (b) Are the effects induced by blindness plus cold exposure pineal dependent? (c) Can cold exposure modify the response of the endocrine-reproductive axis to exogenously administered melatonin? Blind cold-exposed rats showed a significant loss in body weight as well as in weights of pituitary and reproductive tract organs compared with either intact or blind animals kept at 22 degrees C, or intact rats exposed to cold; serum testosterone levels were also lowest in blind cold-exposed rats. These effects were not present in blind cold-exposed animals that were pinealectomized at the beginning of the experiment. When intact animals placed at 22 or 10 degrees C were treated with daily injections of melatonin (50 micrograms) there was a reduction of body weight and weights of the hypophyso-gonadal axis organs. Those effects of melatonin were, however, significantly greater in cold-exposed rats than in rats placed at 22 degrees C. These results suggest that cold exposure should be considered as another state which potentiates the pineal-dependent actions of light deprivation. Cold exposure probably acts by increasing the sensitivity of sites at which pineal melatonin exerts its actions.

journal_name

Cryobiology

journal_title

Cryobiology

authors

Sánchez-Barceló EJ,Cos S,Mediavilla MD

doi

10.1016/0011-2240(86)90020-9

subject

Has Abstract

pub_date

1986-02-01 00:00:00

pages

72-80

issue

1

eissn

0011-2240

issn

1090-2392

pii

0011-2240(86)90020-9

journal_volume

23

pub_type

杂志文章

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