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. 1972 Jan;51(1):181–190. doi: 10.1172/JCI106790

Renomedullary Antihypertensive Function in Accelerated (Malignant) Hypertension

OBSERVATIONS ON RENOMEDULLARY INTERSTITIAL CELLS

E E Muirhead 1,2, B Brooks 1,2, J A Pitcock 1,2, P Stephenson 1,2
PMCID: PMC332944  PMID: 4108666

Abstract

The antihypertensive function of the renal medulla was tested on accelerated (malignant) hypertension of the rabbit. A procedure for the development of accelerated hypertension of the rabbit of lethal proportions within 3 wk was established. This procedure consisted of the application of a rigid clip with a fixed and unyielding gap to the left renal artery and removal of the right kidney. Three additional manipulations, other than simple nephrectomy, were performed on the right kidney after application of the rigid clip to the left renal artery. These were: (a) a sham operation, (b) removal of the kidney and separation of the renal cortex and its autotransplantation in a fragmented state, and (c) removal of the kidney and separation of the renal medulla and its autotransplantation in a fragmented state. After the sham-operated kidney and autotransplanted renal medulla, the standardized accelerated hypertension did not develop, whereas after autotransplanted renal cortex it did. After a period of protection against accelerated hypertension, removal of either the sham-operated kidney or the renomedullary transplants was followed by a prompt rise in arterial pressure and death of the animal. Thus, the antihypertensive action of renomedullary tissue was similar to that of the whole kidney. The main cell type noted in the protective renomedullary transplants had the microscopic characteristics of the lipid-containing interstitial cells. These cells occurred in clusters, often were near capillaries, and appeared hyperplastic. It is suggested that the renomedullary interstitial cell is the most eligible cell for exertion of the renomedullary antihypertensive action. Since vasoactive lipids are extractable from the renal medulla and its interstitial cells, the hypothesis that interstitial cells secrete antihypertensive substance(s) is attractive.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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