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- W1927182147 abstract "Objective: The second messenger cAMP is involved in both β3 adrenoceptor (β3-AR) mediated detrusor relaxation and the kinetics of Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels. Here we characterized the effect HCN channel activation and possible interaction with β3-AR in bladder.Methods: Bladder tissues from Sprague-Dawley rats and Human organ donors obtained for studying species-specific expression of HCN channels by real-time QPCR and Western Blot. Effect of β3-agonist on rat bladder Strips (0.5 x 0.5 x 7 mm in size) was studied during activation and blockade of HCN channels by Lamotrigine and ZD7288, respectively.Results: Expression of all four genes encoding for HCN channels (HCN1-4) was detected separately in bladder mucosa and detrusor from human and rat bladders. Species based differences shown by relatively higher expression of HCN4 isoform in human bladder and that of HCN1 in rat bladder. Western blot confirmed the findings at mRNA level. Cumulative application β3-AR agonist CL316,243 produced a concentration dependent decrease in resting tension of rat bladder strips expressed as integral of mechanical activity. Pre-incubation of HCN channel blocker ZD 7288 opposed the relaxant effect of CL316,243, whereas co-administration of lamotrigine with CL316,243 at equal molar concentrations caused an additive decrease in resting tension. Cumulative addition of ZD7288 and lamotrigine in absence of CL316,243 showed opposing effects on detrusor contractilityConclusions: Species-specific differences noted in expression of HCN channels in bladder. Opposing effects ZD7288 and Lamotrigine in the action of β3-AR agonist demonstrate possible functional interaction of HCN channels and β3-AR in detrusor contractility." @default.
- W1927182147 created "2016-06-24" @default.
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- W1927182147 date "2015-07-17" @default.
- W1927182147 modified "2023-10-16" @default.
- W1927182147 title "Characterization of the role of HCN channels in β3-adrenoceptor mediated rat bladder relaxation" @default.
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- W1927182147 doi "https://doi.org/10.14440/bladder.2015.44" @default.
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