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. 1987 Mar;7(1):91-6.
doi: 10.1007/BF00734992.

The presence of enkephalin-like substances in the eyestalk and brain of the land crab Gecarcinus lateralis

M K Leung, H Kessler, K Whitefield, M Murray, E A Martinez, G B Stefano

The presence of enkephalin-like substances in the eyestalk and brain of the land crab Gecarcinus lateralis

M K Leung et al. Cell Mol Neurobiol. 1987 Mar.

Abstract

The eyestalk of the land crab, Gecarcinus lateralis, is rich in Met-enkephalin-like materials. Leu-enkephalin, if present, is at a level which is below the sensitivity of our assay. The brain (cerebral ganglion) of this organism contains both Met- and Leu-enkephalin-like materials. Material which was reactive with our Met-enkephalin antibody was also detected in a peak that migrated after Leu-enkephalin. This biochemical study confirms earlier immunohistochemical reports which indicated that opioid substances are present in crustaceans. It also strongly supports the concept that opioid mechanisms are a product of early evolution and further demonstrates that the sequence of the smaller opioid compounds has been conserved.

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