Regulation of Water Permeability of the Skin of the Treefrog, Hyla arborea japonica : Physiology

概要

論文の詳細を見る
Water permeabaility of excised skin was investigated in Japanese treefrogs during the non-breeding season. In normal frogs, water flowed inward across the ventral skin at a rate of 0.30 μl/cem^2/min, and outward at a rate of 0.0015 μl/cem^2/min across the dorsal skin. The water flux across the ventral skin was greatly stimulated when frogs were submitted to dehydration. The sympathomimetic agent noradrenaline and the beta-adrenergic receptor agonist isoproterenol (IP) greatly increased the the water flux across the ventral skin, but these had no effect on the dorsal skin. The beta-receptor antagonist propranolol (PP) suppressed the enhanced water influx by dehydration or IP treatment. However, PP had no effect on normal water permeation across the ventral skin. Ouabain, a specific inhibitor of Na^+, K^+ -ATPase, also suppressed the stimulatory effect of IP, whereas this inhibitor again had no effect in normal water flux of the ventral skin. The adrenergic alpha-receptor agonist phenylephrine had no effects on water permeation in either ventral or dorsal skin. Prolactin administration for one week prior to the experimentation decreased water permeability significantly across the ventral skin in both normal and stimulated preparations. These results all argue for the presence of two types of water transport system in the ventral skin of the Japanese treefrog. The first is mediated by the adrenergic beta-receptor and by Na^+, K^+--ATPase activity and may be activated by dehydration. The second is not mediated by the adrenergic receptor and may function as the normal, basal water permeation.
社団法人日本動物学会の論文
1990-06-15

Regulation of Water Permeability of the Skin of the Treefrog, Hyla arborea japonica : Physiology

スポンサーリンク

概要

著者

関連論文

スポンサーリンク