Octopamine regulates antennal sensory neurons via daytime-dependent changes in cAMP and IP3 levels in the hawkmoth Manduca sexta

PloS One
Thomas SchendzielorzMonika Stengl

Abstract

The biogenic amine octopamine (OA) mediates reward signals in olfactory learning and memory as well as circadian rhythms of sleep and activity. In the crepuscular hawkmoth Manduca sexta, OA changed pheromone detection thresholds daytime-dependently, suggesting that OA confers circadian control of olfactory transduction. Thus, with enzyme-linked immunosorbent assays we searched hawkmoth antennae for daytime-dependent changes in the concentration of OA and its respective second messengers. Antennal stimulation with OA raised cAMP- and IP3 levels. Furthermore, antennae expressed daytime-dependent changes in the concentration of OA, with maxima at Zeitgebertime (ZT) 20 when moths were active and also maximal concentrations of cAMP occurred. Maximal IP3 levels at ZT 18 and 23 correlated with maximal flight activity of male moths, while minimal IP3 levels at dusk correlated with peaks of feeding activity. Half maximal effective concentration (EC50) for activation of the OA-receptor decreased during the moth's activity phase suggesting daytime-dependent changes in OA receptor sensitivity. With an antiserum against tyramine, the precursor of OA, two centrifugal neurons were detected projecting out into the sensory cell layer of the ant...Continue Reading

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Methods Mentioned

BETA
enzyme-linked immunosorbent assays
ELISAs
ELISA

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