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Seasonal effects on osmotic permeability ofRana pipiens in vivo and in vitro

✍ Scribed by Parsons, Robert H. ;Brady, Robert ;Goddard, Bryan ;Kernan, Donald

Publisher
John Wiley and Sons
Year
1978
Tongue
English
Weight
322 KB
Volume
204
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

Dependence on season of the osmotic water permeability (Lp) of the skin of whole frogs and isolated preparations of frog leg and abdominal skin have been determined. The Lp of frog skin in vivo and in vitro increases during the summer. However, the increase in vivo occurs in April while the increase in vitro does not occur until August. Injection of arginine vasopressin (ADH) into whole frogs in July produces a 200% increase in the osmotic water permeability, while the same injection in March induces only a slight increase. Isolated abdominal skin shows a similar effect upon stimulation by 500 mU/ml of ADH: a large increase in July with a barely detectable effect in March. Isolated leg skin does not show a response to this level of vasopressin either in July or March. The possibility that seasonal changes in the osmotic permeability of whole animals can be attributed to seasonal variations in sensitivity to ADH is discussed.

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