Abstract
In intact tissue, [d-Ala2,MePhe4, Gly-ol5] enkephalin (10−5 M;μ-ligand), diminsihed short-circuit current (Isc) and increased water, Na+ and Cl− net fluxes in vitro under open circuit conditions; it also inhibitedL-valine absorption andL-valine-dependent variations of short-circuit current (ΔIsc, val). Naloxone (10−6 M) antagonized these effects. In the absence of the muscularis and myenteric plexus this enkephalin or morphine (μ-ligand) reduced Isc and ΔIsc, val. These enkephalin effects occurred at different times. Different concentrations of enkephalin were tested for their effects on ΔIsc, val. [d-Ala2,d-Leu5] enkephalin (mainly a σ-ligand) significantly decreased Isc but not ΔIsc, val. The reduction ofL-valine absorption does not depend on the effects on basal ion transport. Interaction of opioids withμ-receptors located in the submucosal plexus and/or in the epithelial cell accounts for this reduction. This enkephalin effect seems to be at least partially under the control of the myenteric plexus.
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Meyer, G., Bottà, G., Fedele, G. et al. Regulation ofL-valine absorption by opioids interacting withμ-receptors in rabbit ileum. Experientia 51, 1045–1051 (1995). https://doi.org/10.1007/BF01946913
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DOI: https://doi.org/10.1007/BF01946913