Dopamine and Background Adaptation in Bullfrog Tadpoles (<I>Rana catesbeiana</I>): A Pharmacologicaland Histofluorescence Study
スポンサーリンク
概要
- 論文の詳細を見る
Bromocryptine, a dopamine agonist, effectively inhibited the black-adaptation of prometamorphic tadpoles of the bullfrog Rana catesbeiana. The melanophore index (MI) of bromocryptine-injected tadpoles was significantly lower than that of controls. Bromocryptine was also effective in lightening the skin color of the hypophysectomized tadpoles bearing a pituitary graft. When pimozide, a dopamine receptor blocker, was given to the tadpoles adapted to a white background, the MI increased significantly and their skin color became dark. However, pimozide was not effective in darkening the skin color of the hypophysectomized tadpoles. The injection of α-methyl-p-tyrosine (α-MPT), an inhibitor of tyrosine hydroxylase, markedly attenuated the background response of the tadpoles. After being transferred from a black to a white background, the skin color of α-MPT-treated tadpoles was still significantly darker than that of non-injected controls. On histofluorescence examination, numerous green catecholamine fluorescent nerve terminals were found among the glandular cells of α-MPT-injected and control tadpoles adapted to a black background. This green fluorescence in the pars intermedia (PI) of α-MPT-treated tadpoles disappeared 6h after exposure to a white background. However, catecholamine fluorescence in the PI of the controls did not decrease in a white background.<BR>The present results suggest the possible involvement of dopamine in the background response of the bullfrog tadpoles. Since the background response of the tadpole skin color is dependent on the pituitary MSH, dopamine presumably inhibits MSH secretion by acting on the glandular cells of the PI when the animals are exposed to a white background.
- 社団法人 日本内分泌学会の論文
著者
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Kikuyama Sakae
Department Of Biology Faculty Of Science Shizuoka University
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Arai Yasumasa
Department Of Anatomy Juntendo University School Of Medicine
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MIYAKAWA MOMOKO
Department of Anatomy, Juntendo University School of Medicine
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Miyakawa Momoko
Department Of Anatomy Juntendo University School Of Medicine
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Arai Yasumasa
Department Of Anatomy Jaunted University Scool Of Medicine
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