title: Effect of somatostatin analogues and 17-alpha-dihydroequilin on rat brain opiate receptors.
abstract: Two somatostatin analogues (SA)  and 17-alpha-dihydroequilin (E) inhibited the stereospecific binding of 3H-naloxone in vitro to rat brain opiate receptors in the absence of sodium. The addition of sodium indicated the SA to be greater or similar in potency to somatostatin as opiate agonists and E to be an opiate antagonist. The results indicate that SA and certain steroids may affect endorphin containing neurons.
mesh_terms: D015068:17-Ketosteroids / Q000494:pharmacology*; D000818:Animals; D001667:Binding, Competitive; D001921:Brain / Q000187:drug effects* / Q000378:metabolism; D004857:Equilin / Q000031:analogs & derivatives / Q000494:pharmacology*; D066298:In Vitro Techniques; D008297:Male; D009270:Naloxone / Q000378:metabolism; D051381:Rats; D011957:Receptors, Opioid / Q000187:drug effects* / Q000378:metabolism; D012964:Sodium / Q000378:metabolism; D013004:Somatostatin / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D015068:17-Ketosteroids; D011957:Receptors, Opioid; D004857:Equilin; D009270:Naloxone; D013004:Somatostatin; D012964:Sodium