Distal retinal pigment of the fiddler crab, Uca pugilator: release of the dark-adapting hormone by methionine enkephalin and FMRFamide.
The neuropeptides methionine enkephalin and FMRFamide, when injected into intact fiddler crabs, Uca pugilator, produce dark adaptation of the distal retinal pigment. Furthermore, both neuropeptides stimulate release of distal retinal pigment dark-adapting hormone activity from the isolated eyestalk neuroendocrine complex. It is hypothesized that both neuropeptides, when injected into intact fiddler crabs, act only indirectly on the distal retinal pigment, by stimulating release of this dark-adapting hormone.
D000064:Acclimatization / Q000187:drug effects; D000818:Animals; D003386:Brachyura / Q000502:physiology*; D003624:Darkness; D004744:Enkephalin, Methionine / Q000494:pharmacology*; D019835:FMRFamide; D007447:Invertebrate Hormones / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D009479:Neuropeptides / Q000494:pharmacology*; D012016:Reference Values; D012168:Retinal Pigments / Q000502:physiology*
D007447:Invertebrate Hormones; D009479:Neuropeptides; D012168:Retinal Pigments; D004744:Enkephalin, Methionine; D019835:FMRFamide