Summary
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1.
The mechanisms underlying reserpine-induced depletion of neuropeptide Y-like immunoreactivity (NPY-LI) in relation to tissue content of noradrenaline (NA) and cardiovascular impairment were studied in guinea-pigs.
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2.
Reserpine pretreatment (5 mg/kg SC) caused a 5-fold increase in plasma levels of NPY-LI with a maximum after 4 h. This was associated with a progressive fall in systemic arterial blood pressure and heart rate (to about 50% of basal values). The contents of NPY-LI and NA in nerves of the heart and quadriceps muscle were then reduced by about 75% and 85%, respectively. The adrenal content of NPY-LI was reduced by 40% 8 h after reserpine, while the adrenaline content was uninfluenced.
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3.
Pretreatment with guanethidine depleted NA in the heart but did not influence plasma levels or tissue content of NPY-LI per se. The reserpine-induced increase in plasma NPY-LI and the depletion of NPY-LI in the heart and skeletal muscle was to a large extent prevented by guanethidine. The reserpine-induced bradycardia and hypotension were reduced after guanethidine pretreatment.
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4.
Chlorisondamine pretreatment depressed heart rate, blood pressure and plasma levels of NPY-LI. Furthermore, chlorisondamine inhibited the reserpine-induced increase in plasma NPY-LI and prevented the reduction in tissue content of NPY-LI in the heart, skeletal muscle and adrenal. The tissue depletion of NA induced by reserpine, however, was not influenced by chlorisondamine. The reserpine-induced hypotension was reduced by chlorisondamine, while the bradycardia was not influenced.
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5.
In conclusion, reserpine pretreatment induced a marked increase in plasma NPY-LI in guinea-pigs. The plasma raise in NPY-LI was reduced by guanethidine, which is likely to inhibit NPY release from sympathetic terminals, and blocked by chlorisondamine which blocks sympathetic transmission at the ganglionic level, suggesting that reserpine caused an enhanced release of NPY from certain sympathetic nerves and adrenal gland. Enhanced release of NPY in excess of resupply caused by neurogenic activation and/or loss of local presynaptic inhibitory control of release due to NA depletion may therefore explain the reduction in tissue content of NPY-LI. Whether NPY depletion contributes to the cardiovascular impairment seen after reserpine remains of be established.
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Lundberg, J.M., Al-Saffar, A., Saria, A. et al. Reserpine-induced depletion of neuropeptide Y from cardiovascular nerves and adrenal gland due to enhanced release. Naunyn-Schmiedeberg's Arch. Pharmacol. 332, 163–168 (1986). https://doi.org/10.1007/BF00511407
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DOI: https://doi.org/10.1007/BF00511407