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• W2891625275 abstract "β-Phenylethylamine (β-PEA) is a trace amine with chemical proximity to biogenic amines and amphetamines. It is an endogenous agonist of trace amine-associated receptors (TAARs) that acts as a neuromodulator of classic neurotransmitters in the central nervous system. At high concentrations, β-PEA contracts smooth muscle, and a role for TAARs in these responses has been postulated. The high dietary intake of trace amines has been associated with such symptoms as hypertension and migraine, especially after the intake of foods containing such compounds. In gastrointestinal tissues, TAAR expression was reported, although the effect of β-PEA on gastric contractile behaviour is unknown. Here, isolated strips that were obtained from the rat gastric fundus were stimulated with high micromolar concentrations of β-PEA. Under resting tonus, β-PEA induced contractions. In contrast, when the strips were previously contracted with KCl, a relaxant response to β-PEA was observed. The contractile effect of β-PEA was inhibited by 5-hydroxytryptamine (5-HT) receptor antagonists (i.e., cyproheptadine and ketanserin) but not by the TAAR1 antagonist EPPTB. In gastric fundus strips that were previously contracted with 80 mmol/L KCl, the relaxant effect of β-PEA intensified in the presence of 5-HT receptor antagonists, which was inhibited by EPPTB and the adenylyl cyclase inhibitor MDL-12,330A. The guanylyl cyclase inhibitor ODQ did not alter the relaxant effects of β-PEA. In conclusion, β-PEA exerted dual contractile and relaxant effects on rat gastric fundus. The contractile effect appeared to involve the recruitment of 5-HT receptors, and the relaxant effect of β-PEA on KCl-elicited contractions likely involved TAAR1 ." @default.
• W2891625275 created "2018-09-27" @default.
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• W2891625275 date "2018-10-16" @default.
• W2891625275 modified "2023-10-14" @default.
• W2891625275 title "Dual excitatory and smooth muscle‐relaxant effect of β‐phenylethylamine on gastric fundus strips in rats" @default.
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• W2891625275 doi "https://doi.org/10.1111/1440-1681.13033" @default.
• W2891625275 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30229988" @default.
• W2891625275 hasPublicationYear "2018" @default.
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