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- W2041421031 abstract "Human internal anal sphincter (IAS) is contracted by α1-adrenoceptor stimulation and thus α1-adrenoceptor agonists may be useful in treating fecal incontinence. This study characterizes the contribution of α1-adrenoceptor subtypes in contraction of human IAS and to investigate the age-related risk of patients with fecal incontinence. IAS and inferior mesenteric artery (IMA), as a predictor of systemic arterial pressure, were obtained from 11 patients. Both muscle strips were assessed by isometric-contraction experiments using phenylephrine, further in IAS, in the presence of various subtype selective α1-adrenoceptor antagonists. Immunohistochemistry and gene expression studies were performed in the same samples. The mean pEC50 values with SEM of phenylephrine in IAS (6.30 ± 0.13) were higher than those of IMA (5.60 ± 0.10). Furthermore, the age-related pEC50 change of IAS was observed between age <70 and ≥70 (6.58 ± 0.13 and 6.07 ± 0.16, respectively (P < 0.05)). In IAS, rightward shift of the concentration-response curves of phenylephrine was observed with three α1-adrenoceptor antagonists. Each pKB value of silodosin, BMY-7378 and prazosin was 9.36 ± 0.53, 7.28 ± 0.20 and 8.89 ± 0.12, respectively. These pKB values and gene expression studies indicated that α1A-adrenoceptor subtypes predominantly contributed to human IAS contraction." @default.
- W2041421031 created "2016-06-24" @default.
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- W2041421031 creator A5059335449 @default.
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- W2041421031 date "2015-04-01" @default.
- W2041421031 modified "2023-09-25" @default.
- W2041421031 title "Characterizations of the α1-adrenoceptor subtypes mediating contractions of the human internal anal sphincter" @default.
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- W2041421031 doi "https://doi.org/10.1016/j.jphs.2015.02.016" @default.
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