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- W2021232010 abstract "1 The effects of endogenous noradrenaline released by tyramine and the influence of depletion of the tissue noradrenaline with reserpine and/or alpha-methyl-p-tyrosine on the twitch responses of the field-stimulated mouse vas deferens have been studied.2 Tyramine (10-40 muM) inhibited the twitch responses to field stimulation and failed to produce a contraction. The inhibition decreased as the rate of stimulation increased.3 The inhibition produced by tyramine was antagonized by cocaine (10 muM) and by yohimbine (10 nM), which indicated that it was produced by released noradrenaline acting on presynaptic alpha-adrenoceptors.4 Depletion of the tissue noradrenaline by 39% by blockade of the synthesis of noradrenaline with alpha-methyl-p-tyrosine, was without effect on the twitch response but it reduced the inhibitory effect of tyramine.5 Depletion of the tissue noradrenaline by 96.5% with reserpine alone and by 99.4%, with a combination of reserpine and alpha-methyl-p-tyrosine, reduced the twitch responses by approximately 66% and virtually abolished the inhibition produced by tyramine. It also increased the rate of decline of the responses when the tissue was continuously stimulated. The remaining twitch was not antagonized by phenoxybenzamine (15 muM).6 Residual twitches were bigger in tissues depleted by 99.4% than in those depleted by only 96.5%. This difference was eliminated in the presence of yohimbine (128 nM).7 It is concluded that inhibition of the twitch responses by tyramine is produced by stimulation of presynaptic alpha-adrenoceptors and that the twitch response is associated with stimulation of the sympathetic neurone, but that it is not mediated by postsynaptic alpha-adrenoceptors." @default.
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- W2021232010 date "1978-09-01" @default.
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- W2021232010 title "THE EFFECTS OF RELEASE AND DEPLETION OF ENDOGENOUS NORADRENALINE ON THE TRANSMISSION OF IMPULSES IN THE MOUSE VAS DEFERENS" @default.
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- W2021232010 doi "https://doi.org/10.1111/j.1476-5381.1978.tb08651.x" @default.
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