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Immunohistochemical localization of opioid peptides in the brain of the leech Theromyzon tessulatum
Authors:M Verger-Bocquet  J Malecha  G Tramu
Institution:(1) Unité Associée au C.N.R.S. ncompfn 148, Endocrinologie des Invertébrés, Université de Lille Flandres-Artois, Villeneuve-d'Ascq, France;(2) Unité 156, I.N.S.E.R.M., Lille, France;(3) Unité Associée au C.N.R.S. ncompfn 148 Endocrinologie des Invertébrés, Université de Lille Flandres-Artois, F-59655 Villeneuve-d'Ascq Cédex, France
Abstract:Summary By use of antisera directed against met-enkephalin, leu-enkephalin, dynorphin or agr-neoendorphin, immunoreactive structures were visualized in the central nervous system and proboscis of the leech Theromyzon tessulatum. Their distribution in the various compartments of the supra- and subesophageal ganglia was mapped. No correspondence could be established between the neurons containing met- or leu-enkephalin-like substances and the different types of neurosecretory cells classically described in Hirudinea. Successive localization of leu- and met-enkephalin on the same section revealed that these two peptides occur in different neurons. Only one cell located in compartment 6 of the supraesophageal ganglion was both dynorphin- and leu-enkephalin-positive. The other dynorphinimmunoreactive cells were not stained with the anti-leuenkephalin serum. The agr-neoendorphin-immunopositive cells were leu-enkephalin immunonegative and vice versa.
Keywords:Opioid peptides  Immunohistochemistry  Annelida: Hirudinea  Theromyzon tessulatum
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