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Effect of histaminergic drugs on tail melanophores of tadpole, Bufo melanostictus.
Indian J Exp Biol ; 1993 May; 31(5): 440-2
Article in English | IMSEAR | ID: sea-61618
ABSTRACT
The H1 and H2 receptor agonist histamine caused a powerful aggregation of B. melanostictus tail melanophores, which was completely blocked by metiamide, a specific H2 receptor antagonist, while mepyramine an H1 receptor blocker partially blocked the aggregating response. The strong melanin aggregating effect of 4-methyl histamine a specific H2 receptor agonist and its complete blockade by metiamide further supports the conclusion that there exists a dominant population of H2 type of histamine receptors along with sparse population of H1 receptor on the tail melanophores of the toad, which mediate centripetal movement of melanin granules within the pigment cells leading to blanching of the animal.
Subject(s)
Full text: Available Index: IMSEAR (South-East Asia) Main subject: Bufonidae / Receptors, Histamine / Histamine / Embryo, Nonmammalian / Animals / Melanophores Language: English Journal: Indian J Exp Biol Year: 1993 Type: Article

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Full text: Available Index: IMSEAR (South-East Asia) Main subject: Bufonidae / Receptors, Histamine / Histamine / Embryo, Nonmammalian / Animals / Melanophores Language: English Journal: Indian J Exp Biol Year: 1993 Type: Article