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- W2023573816 abstract "1 The present study was carried out compare the effects of nifedipine, verapamil, papaverine and chloroethylclonidine (CEC) on the electrically-induced contractions and on the contractions produced by exogenous noradrenaline and α,β methylene-ATP in the epidydimal portion of rat vas deferens. 2 Nifedipine inhibited in a concentration-dependent fashion the purinergic component (phase I) of the electrically evoked response. Verapamil (10−−7 M−10−−5 M) did not inhibit significantly or even potentiated phase I of the contractile response to single-pulse field stimulation but inhibited the response to α,β methylene-ATP. Papaverine left unaffected phase I but depressed the response to α,β methylene-ATP. CEC significantly potentiated the purinergic component of the electrically-evoked response and the response induced by α,β methylene-ATP. 3 Nifedipine was devoid of any inhibitory action on the noradrenergic component (phase II) of the response to single shock. Verapamil at the highest concentration used (10−−5 M) was able to partially inhibit phase II. Papaverine abolished in a concentration-dependent manner the noradrenergic component of the response to single shock. CEC abolished the phase II of single shock while was devoid of any inhibitory action on exogenous noradrenaline. 4 The implications of these differences among the compounds studied in the present work are discussed in relation to roles of calcium channels." @default.
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- W2023573816 date "1999-08-01" @default.
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- W2023573816 title "Differential blockade of alpha,beta-methylene-ATP, noradrenaline and electrically evoked contractions of the rat vas deferens" @default.
- W2023573816 doi "https://doi.org/10.1046/j.1365-2680.1999.00143.x" @default.
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