Journal
ACTA BIOLOGICA HUNGARICA
Volume 55, Issue 1-4, Pages 177-183Publisher
AKADEMIAI KIADO ZRT
DOI: 10.1556/ABiol.55.2004.1-4.22
Keywords
Lymnaea stagnalis; feeding; octopamine; receptor; second messenger
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We describe octopamine responses of 3 large buccal neurons of Lymnaea and test the hypothesis that these are cAMP-dependent. The B1 neuron is excited by octopamine and the depolarisation is significantly enlarged (P < 0.05) by application of the blocker of cAMP breakdown, 3-isobutyl-1-methylxanthine (IBMX). The B1 neuron is also depolarised by forskolin, an activator of adenylyl cyclase. The B2 and B3 neurons are inhibited by octopamine, and the response is not affected by IBMX Both cells are excited by forskolin. We conclude that the B I neuron response to octopamine is likely to be mediated by cAMP, while the B2 and B3 responses are cAMP-independent.
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