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. 1977 Jan;59(1):209–214. doi: 10.1111/j.1476-5381.1977.tb06996.x

The effects of reserpine and 6-hydroxydopamine on the concentrations of some arylakylamines in rat brain.

A A Boulton, A V Juorio, S R Philips, P H Wu
PMCID: PMC1667690  PMID: 837000

Abstract

1 The concentrations of p- and m-tyramine were measured in the caudate nucleus of the rat brain following subcutaneous injection of reserpine or intraventricular injection of 6-hydroxydopamine, beta-Phenylethylamine was analysed in the hypothalamus after reserpine. 2 Endogenous levels of p-tyramine and m-tyramine in the caudate nucleus, and beta-phenylethylamine in the hypothalamus were 8.02, 2.25 and 2.52 ng/g respectively. 3 Tyramine concentrations were reduced to less than 20% of control values one day after a reserpine injection of 1 or 10 mg/kg. A single dose of reserpine (0.4 mg/kg) significantly decreased the content of both tyramines in the caudate nucleus. The effects became apparent as early as 45 min after drug case of m-tyramine. 4 The hypothalamic content of beta-phenylethylamine was unaffected by reserpine. 5 Ten days after an intraventricular injection of 6-hydroxydopamine (250 mug), p- and m-tyramine concentrations in the caudate nucleus were significantly below control levels. 6 The results suggest that p- and m-tyramine may be stored by an intraneuronal reserpine-sensitive storage mechanism. Alternatively, the tyramines may replace some of the catecholamines from their storage granules and then be released as false transmitters by the nervous impulse. The observed changes in tyramine levels might also the fact that these amines may be metabolically related to another amine which is stored in reserpine-sensitive granules.

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Selected References

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