Abstract
The octopamine content of dorsal longitudinal nerves and of dorso-ventral nerve-muscle tissues was lower in locusts flown for 10 min than in unflown controls. No such change was found for the octopamine content of brain or thoracic ganglia. Endogenous octopamine was released from isolated working thoracic muscle preparations perfused in the presence of yohimbine. It is proposed that release of octopamine from thoracic nerves can account for much of the increase in octopamine that occurs in haemolymph during the first few minutes of flight. Octopamine injected into locusts in vivo was rapidly removed from the haemolymph. In vitro experiments showed that Malpighian tubules were effective at removing octopamine added to the incubation medium. When the octopamine content of crude tissue preparations such as whole tagmata is estimated by radioenzymatic procedures, erroeneously high results are obtained unless precautions are taken to purify the labelled product.
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