Delta-Opioid Receptor mRNA Expression and Immunohistochemical Localization in Porcine Ileum
Tóm tắt
Opiates have potent antidiarrheal actions thatare mediated in part by delta-opioid receptors (DOR). Weexamined DOR localization within subregions of porcineileum, a tissue analogous to human small bowel. A partial cDNA sequence for porcine DOR wasobtained after reverse transcription-polymerase chainreaction cloning of forebrain RNA; it encoded the end oftransmembrane domain 1 through the beginning of transmembrane domain 7 and exhibited 93%nucleotide identity with human DOR. Positive signals forDOR mRNA were found in all subregions of the porcineileal wall. With an antiserum recognizing an N-terminal epitope in murine DOR, DOR-likeimmunoreactivity was localized in neurons withinmyenteric and submucous ganglia, longitudinal andcircular smooth muscle, and villous lamina propria. TheDOR agonist [D-Ser2, Leu5, Thr6]enkephalin(DSLET) attenuated circular smooth muscle contractionsin porcine ileum that were evoked by electricalstimulation of myenteric cholinergic neurons. Theseresults are consistent with previous reports of the DOR-mediatedneuromodulation that underlies the antipropulsive andantisecretory effects of opioids in the intestinaltract.
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