THE dopaminergic modulation of neuronal transmission in coeliac ganglia of spontaneously hypertensive rats (SHR) has been shown to be less efficient than in control Wistar Kyoto rats (WKY). From these results it was inferred that the development of hypertension may be due to this defect. Recent reports2,3 suggest that polypeptides may function as neurotransmitters or neuromodulators in sympathetic ganglia. A heterogeneous group of immunoreactive Met5-enkephalin-like (ME) peptides have been found in these ganglia3, and are also present in adrenal glands, in both chromaffin cells and afferent axons (unpublished observations). Some of these peptides, when released from the afferent axons, may modulate opiate receptors located in adrenal medulla (unpublished observations). The vasodilatory action of morphine suggests that if the opiate agonists present in the chromaffin cells were to be secreted they might also cause vasodilation by acting on distant receptors. In view of their possible role in the regulation of sympathetic transmission and vascular tone, we have studied the content and Chromatographie characteristics of the immunoreactive ME-like peptides in adrenal gland, sympathetic ganglia, salivary gland and hypothalamus of SHR and WKY rats. We report here that the content of these peptides was lower in SHR than WKY rats in all tissues studied, except the hypothalamus. In sympathetic ganglia this decrease was due to a reduction in the ME content and not to that of the high molecular weight (MW) immunoreactive ME-like peptides.
Subscribe to Journal
Get full journal access for 1 year
only $3.83 per issue
All prices are NET prices.
VAT will be added later in the checkout.
Rent or Buy article
Get time limited or full article access on ReadCube.
All prices are NET prices.
Lutold, B. E., Karoum, F. & Neff, N. H. Circulation Res. (in the press).
Schultzberg, M. et al. Neuroscience 3, 1169–1186 (1978).
Di Giulio, A. M. et al. Neuropharmacology 17, 989–992 (1978).
Costa, E., Di Giulio, A., Fratta, W., Hong, J. & Yang, H.-Y.T. In Proc. 4th int. Congr. On Catecholamines (ed. Usdin, E.) (Pergamon, Oxford, in the press).
Yang, H.-Y.T., Fratta, W., Hong, J. S., Di Giulio, A. M. & Costa, E. Neuropharmacology 17, 433–438 (1978).
Eckenhoff, J. E. & Oech, S. R. Clin. Pharmac. Ther. 1. 483–524 (1960).
Gomes, C., Svensson, T. H. & Trolin, G. Naunyn Schmiedebergs Archs Pharmak. 294, 141–147 (1976).
Yang, H.-Y. T., Hong, J. S. & Costa, E. Neuropharmacology 16, 303–307 (1977).
About this article
Cite this article
DI GIULIO, A., YANG, H., FRATTA, W. et al. Decreased content of immunoreactive enkephalin-like peptide in peripheral tissues of spontaneously hypertensive rats. Nature 278, 646–647 (1979). https://doi.org/10.1038/278646a0
Plasma levels of β-endorphin, leucine enkephalin and arginine vasopressin in patients with essential hypertension and the effects of clonidine
International Journal of Cardiology (1995)
Clinical and Experimental Hypertension. Part A: Theory and Practice (1989)
Brain Research (1987)
[Met5]enkephalin-Arg6-Phe7- and [Met5]enkephalin-Arg6-Gly7-Leu8-immunoreactive nerve fibres and neurons in the superior cervical ganglion of the rat