Renal medullary antihypertensive mechanisms. 1995

W P Anderson, and R L Woods, and C J Thomas, and G Szenasi, and R G Evans
Baker Medical Research Institute, Melbourne, Victoria, Australia.

1. Increasing renal perfusion pressure, using an extracorporeal circuit in rabbits and dogs, causes release from the kidney of a vasodepressor substance. 2. The hypotensive response occurs in denervated kidneys, and it is not due to platelet activating factor, nitric oxide, prostanoids or suppression of renin release. 3. In the rabbit, the pressure threshold for release of the hypotensive substance appears to be slightly above normal resting pressures. 4. The source of the hypotensive substance is medullary, since the hypotensive response to increased renal perfusion pressure is abolished in dogs and rabbits whose medullae are damaged by bromoethylamine treatment. 5. The chemical nature of the hypotensive substance remains unknown. 6. Thus the renal medulla appears to possess a hypotensive hormone, released in response to elevation of renal perfusion pressure. Many aspects of the physiology and pathology of the substance and its significance in blood pressure regulation remain to be determined.

UI MeSH Term Description Entries
D006973 Hypertension Persistently high systemic arterial BLOOD PRESSURE. Based on multiple readings (BLOOD PRESSURE DETERMINATION), hypertension is currently defined as when SYSTOLIC PRESSURE is consistently greater than 140 mm Hg or when DIASTOLIC PRESSURE is consistently 90 mm Hg or more. Blood Pressure, High,Blood Pressures, High,High Blood Pressure,High Blood Pressures
D007668 Kidney Body organ that filters blood for the secretion of URINE and that regulates ion concentrations. Kidneys
D012083 Renin A highly specific (Leu-Leu) endopeptidase that generates ANGIOTENSIN I from its precursor ANGIOTENSINOGEN, leading to a cascade of reactions which elevate BLOOD PRESSURE and increase sodium retention by the kidney in the RENIN-ANGIOTENSIN SYSTEM. The enzyme was formerly listed as EC 3.4.99.19. Angiotensin-Forming Enzyme,Angiotensinogenase,Big Renin,Cryorenin,Inactive Renin,Pre-Prorenin,Preprorenin,Prorenin,Angiotensin Forming Enzyme,Pre Prorenin,Renin, Big,Renin, Inactive
D001794 Blood Pressure PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS. Systolic Pressure,Diastolic Pressure,Pulse Pressure,Pressure, Blood,Pressure, Diastolic,Pressure, Pulse,Pressure, Systolic,Pressures, Systolic
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia

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