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Relative potencies of locust adipokinetic hormone and prawn red pigment-concentrating hormone in insect and crustacean systems

1977; Elsevier BV; Volume: 33; Issue: 1 Linguagem: Inglês

10.1016/0016-6480(77)90132-0

1095-6840

W. Mordue, Judith V. Stone,

Insect and Arachnid Ecology and Behavior

The molar activities of locust adipokinetic hormone (AKH) and prawn red pigment-concentrating hormone (RPCH) in mobilising lipids in locusts and on red pigment concentration in prawns are compared. AKH is five times more potent than RPCH in the locust system, whereas RPCH is four times more active than AKH on prawn erythrophores. These two hormones are equally effective in concentrating black pigments in the shrimp, Crangon. RPCH is more potent than AKH in causing hyperglycaemia in cockroaches, through relatively large doses of both hormones are needed to elicit this response. AKH, in lower doses, is also able to induce hyperglycaemia in the crab, Portunus. The close structural similarity of AKH and RPCH clearly account for their activity in each other's systems. However, it is not known whether the additional effects observed here reflect structural resemblances among other arthropod neurohormones.