Evidence for the involvement of 5-hydroxytryptamine 4 receptors in 5-hydroxytryptophan-induced diarrhea in mice.
The objective of this study was to characterize the receptor(s) to 5-HT mediating 5-HTP-induced diarrhea in mice. The severity of diarrhea in mice was assessed using an arbitary scoring scale ranging from 0 (normal stools) to 3 (watery diarrhea). Administration of 5-HTP (1-30 mg/kg i.p.) produced a dose-dependent increase in diarrhea score (ED50, 1.47 mg/kg i.p.). 5-HTP (10 mg/kg i.p.)-induced diarrhea was unaffected by atropine (3 mg/kg i.p.) but was completely abolished by the aromatic L-amino acid decarboxylase inhibitor benserazide (10 mg/kg i.p.). Pretreatment (5 min before 5-HTP) with DAU 6285, a marginally selective 5-HT4 receptor antagonist, significantly inhibited 5-HTP-induced diarrhea (ID50, 0.58 mg/kg i.p.). Pretreatment (5 min before 5-HTP) with GR 113808 or SB 204070, two highly selective 5-HT4 antagonists, significantly inhibited 5-HTP-induced diarrhea with ID50 estimates of 0.31 and 0.003 mg/kg i.p., respectively. The maximal inhibition produced by DAU 6285, GR 113808 and SB 204070 was 63%, 68% and 36%, respectively. Neither GR 113808 (1 and 3 mg/kg i.p.) nor SB 204070 (0.1 and 1 mg/kg i.p.) had any effect on 16,16-dimethyl prostaglandin E2 (30 micrograms/kg i.p.)-induced diarrhea in mice. DAU 6285 significantly inhibited 16,16-dimethyl prostaglandin E2-induced diarrhea at the highest dose (3 mg/kg i.p.). Pretreatment (30 min before 5-HTP) with methysergide (0.1-3 mg/kg i.p.), metergoline (0.01-0.1 mg/kg i.p.), ketanserin (0.01-1 mg/kg i.p.), YM 060 (0.01-0.1 mg/kg i.p.) or ondansetron (0.01-3 mg/kg i.p.) had no significant effects on 5-HTP-induced diarrhea.(ABSTRACT TRUNCATED AT 250 WORDS)
Institute of Pharmacology, Syntex Discovery Research, Palo Alto, California.
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D006916:5-Hydroxytryptophan / Q000494:pharmacology*; D000818:Animals; D001285:Atropine / Q000494:pharmacology; D001545:Benserazide / Q000494:pharmacology; D001562:Benzimidazoles / Q000494:pharmacology; D001643:Bridged Bicyclo Compounds / Q000494:pharmacology; D019086:Bridged Bicyclo Compounds, Heterocyclic; D003967:Diarrhea / Q000139:chemically induced*; D004146:Dioxanes / Q000494:pharmacology; D007211:Indoles / Q000494:pharmacology; D008297:Male; D051379:Mice; D010275:Parasympathetic Nervous System / Q000502:physiology; D010880:Piperidines / Q000494:pharmacology; D011985:Receptors, Serotonin / Q000187:drug effects* / Q000502:physiology; D013449:Sulfonamides / Q000494:pharmacology
D001562:Benzimidazoles; D001643:Bridged Bicyclo Compounds; D019086:Bridged Bicyclo Compounds, Heterocyclic; D004146:Dioxanes; D007211:Indoles; D010880:Piperidines; D011985:Receptors, Serotonin; D013449:Sulfonamides; C074390:DAU 6285; C084858:SB 204070A; D001545:Benserazide; D001285:Atropine; D006916:5-Hydroxytryptophan; C082871:GR 113808