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PHARMACOLOGICAL EVIDENCE FOR INVOLVEMENT OF PRESYNAPTIC ALPHA 2 ADRENOCEPTORS IN NOREPINEPHRINERGIC NEUROTRANSMISSION TRIGGERING THE RELEASE OF MELANIN-DISPERSING HORMONE IN THE FIDDLER CRAB UCA PUGILATOR

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image of Journal of Crustacean Biology

ABSTRACT 1. The specific alpha2 adrenoceptor agonist B-HT 933 significantly reduced the rate of melanin dispersion in crabs transferred from a white to a black background. 2. The specific alpha2 adrenoceptor blockers rauwolscine and yohimbine significantly increased the rate of melanin dispersion in crabs transferred from a white to a black background. 3. Rauwolscine and yohimbine, but not the alpha, adrenoceptor blocker indoramin, antagonized B-HT 933. 4. In crabs pretreated with the catecholaminergic neurotoxin 6-hydroxydopamine, which inhibits melanin dispersion, B-HT 933 did not produce further significant inhibition in the rate of melanin dispersion. 5. None of the drugs has been found to affect melanin migration in melanophores of isolated legs. 6. The results are consistent with the hypothesis that presynaptic adrenoceptors very similar to alpha2 adrenoceptors of mammals regulate impulse-mediated norepinephrinergic neurotransmission in the fiddler crab Uca pugilator, norepinephrine triggering release of a melanin-dispersing hormone.

Affiliations: 1: Department of Biology, Tulane University, New Orleans, Louisiana 70118

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/content/journals/10.1163/1937240x82x00022
1982-01-01
2016-12-06

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