20 research outputs found
Calcium involvement in mediating the action of octopamine and hypertrehalosemic peptides on insect haemocytes
Get PDFAbstractOctopamine, the hypertrehalosemic peptides HT-I and HT-II and the calcium ionophore A23187 elevate intracellular calcium levels in cultured haemocytes of Malacosoma disstria (Lepidoptera: Lasiocampidae). The octopamine-mediated response is dose-dependent and the magnitude of the response is influenced by the concentration of calcium in the incubation medium. Mianserin, an inhibitor of octopamine-mediated elevation of cyclic AMP production, blocks the octopamine-mediated increase in intracellular calcium but has no effect on the HT-I- and HT-II-mediated responses. The results indicate that some effects of octopamine are mediated through agonist-dependent calcium gating whereas others are expressed through receptors coupled to adenylate cyclase. The study also confirms previous suggestions that HT-I and HT-II elevate intracellular calcium concentrations
Elevation of adenosine 3′,5′-monophosphate by octopamine in fat body of the american cockroach, Periplaneta americana L
No full textEffect of taurine on serum trehalase activity in the American cockroach, Periplaneta americana
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Binding of [3H]pifluthixol, a dopamine antagonist, in the brain of the American cockroach, Periplaneta americana
No full textCalcium involvement in mediating the action of octopamine and hypertrehalosemic peptides on insect haemocytes
No full textDopamine, and in tissues of newly ecdysed and fully tanned adult cockroaches (Periplaneta americana)
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Sex pheromone biosynthesis in the red-banded leafroller moth, studied by mass-labeling with stable isotopes and analysis with mass spectrometry
No full textBehaviour, physiological states and thermal characteristics of aggregating male Hybomitra illota (Diptera: Tabanidae)
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