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- W2414443722 abstract "Neuroanatomical, electrophysiological and immunohistochemical techniques were used to describe correlations between soma morphology and electrophysiological properties in two groups of guinea-pig enteric neurones posing particular challenges. Lucifer Yellow-staining of 542 myenteric plexus neurones of duodenum revealed a great diversity of neuronal morphology. The distribution was: Dogiel Type I 27%, Dogiel Type II 54%, Stach Type IV 9%; 10% were unclassified. Correlations were sought in 59 of these cells between morphology and electrophysiological properties but no particular association was recognised. Dynorphin A(1-8)-like immunoreactivity (Dyn A(1-8)-IR) was found in up to 90% of identified submucous neurones of guinea-pig ileum. Of 62 S-neurones, 41 showed 'weak' and 19 had 'intense' Dyn A (1-8)-IR. There was no evidence of Dyn A(1-8)-IR in 2 S-neurones, nor in 8/8 AH-neurones. As for 11/16 vasoactive intestinal peptide- (VIP-) IR neurones, there was a strong correlation between the presence of 'weak' Dyn A(1-8)-IR and the occurrence of inhibitory (IPSPs) and slow excitatory synaptic potentials (EPSPs) (13/16 cells tested), which were never observed in neurones with 'intense' Dyn A(1-8)-IR (16/16) or neuropeptide Y (NPY)-IR (8/8). Similarly, 7/7 neurones with 'weak' Dyn A(1-8)-IR, but not those (7/7) with 'intense' Dyn A(1-8)-IR, hyperpolarised or showed a conductance change to noradrenaline. It was concluded that dynorphin A(1-8)-like-IR was contained in two populations of submucous neurone that are anatomically, immunohistochemically, electrophysiologically and pharmacologically distinct and closely related to those containing VIP and NPY. Furthermore, as in the myenteric plexus throughout the small intestine, opioid peptides are not expressed in Dogiel Type II cells." @default.
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- W2414443722 date "1992-01-01" @default.
- W2414443722 modified "2023-10-11" @default.
- W2414443722 title "Complex correlations between the morphology, electrophysiology and peptide immunohistochemistry of guinea-pig enteric neurones." @default.
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