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Prorenin and (pro)renin receptor: a review of available data from in vitro studies and experimental models in rodents Nguyen G; Danser AHExp Physiol 2008[May]; 93 (5): 557-63The discovery of a (pro)renin receptor [(P)RR] and the introduction of renin inhibitors in the clinic have brought renin and prorenin back into the spotlight. The (P)RR binds both renin and its inactive precursor prorenin, and such binding triggers intracellular signalling that upregulates the expression of profibrotic genes, potentially leading to cardiac and renal fibrosis, growth and remodelling. Simultaneously, binding of renin to the (P)RR increases its angiotensin I-generating activity, whereas binding of prorenin allows the 'inactive' renin precursor to become fully enzymatically active. Therefore, the (pro)renin receptor system could be considered as having two functions, an angiotensin-independent function related to (P)RR-induced intracellular signalling and its downstream effects and an angiotensin-dependent function related to the increased catalytic activity of receptor-bound (pro)renin. A (P)RR blocker has already been described which blocks both functions, thus preventing diabetic nephropathy, cardiac fibrosis and ocular neovascularization. On-going experimental studies should now determine which of the two functions plays the more important role in pathological situations. The results of these studies are extremely important in view of the clinical use of renin inhibitors, since it is well known that their administration results in increased levels of both renin and prorenin. Although this rise can be interpreted as evidence of effective renin-angiotensin system blockade, it could also result in increased (P)RR activation.|Aging/physiology[MESH]|Animals[MESH]|Cardiovascular Diseases/metabolism[MESH]|Kidney Diseases/metabolism[MESH]|Mice[MESH]|Prorenin Receptor[MESH]|Rats[MESH]|Receptors, Cell Surface/metabolism/*physiology[MESH]|Renin/metabolism/*physiology[MESH] |
