Relationship of adipokinetic hormone I and II to migratory propensity in the grasshopper, Melanoplus sanguinipes.

This report examines three aspects of adipokinetic hormone (AKH) involvement in migratory flight behavior in the grasshopper, Melanoplus sanguinipes. The titer of hemolymph AKH I during long-duration tethered flight was examined using radioimmunoassay (RIA) after narrow bore RP-HPLC. The hemolymph fraction containing AKH I was assayed using commercially available anti-Tyr1-AKH I serum. Titer determinations of hemolymph AKH were done at rest and after various periods of flight. The amount of AKH I released from the corpora cardiaca during flight was estimated. When resting levels of AKH I and II in corpora cardiaca (CC) of migrants and non-migrants were examined with HPLC, no significant differences in AKH levels were detected between non-migrants, animals that had flown for 1 h to identify them as migrants, and animals that had flown to exhaustion (i.e., voluntary cessation). CC levels of both AKH I and II were less in this species than in locusts. When the lipid mobilization in response to AKH I and II was compared in migrants (animals that had self-identified as migrants in a 1-h tethered flight test) and non-migrants (animals that would not perform a 1-h flight in a tethered flight test), the adipokinetic response to AKH I was greater in migrants than in non-migrants, possibly indicating differences in level of sensitivity or number of receptors in the target tissues. AKH II had little effect on hemolymph lipid levels in either flight group, and may not play a significant role in lipid mobilization in this species.

Min KJ ，Taub-Montemayor TE ，Linse KD ，Kent JW Jr ，Rankin MA ... -  《ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY》

Increased juvenile hormone levels after long-duration flight in the grasshopper, Melanoplus sanguinipes.

Min KJ ，Jones N ，Borst DW ，Rankin MA ... -  《JOURNAL OF INSECT PHYSIOLOGY》

Endocrine control of TAG lipase in the fat body of the migratory locust, Locusta migratoria.

Auerswald L ，Gäde G 《INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY》

Flight fuel and neuropeptidergic control of fuel mobilisation in the twig wilter, Holopterna alata (Hemiptera, Coreidae).

Gäde G ，Auerswald L ，Marco HG 《JOURNAL OF INSECT PHYSIOLOGY》

Trehalose inhibits the release of adipokinetic hormones from the corpus cardiacum in the African migratory locust, Locusta migratoria, at the level of the adipokinetic cells.

Passier PC ，Vullings HG ，Diederen JH ，Van der Horst DJ ... -  《JOURNAL OF ENDOCRINOLOGY》