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• W2078443710 abstract "Big renin has a greater molecular weight (63,000 versus 43,000) than normal renin, but it shares the characteristic enzymatic and immunologic properties of normal renin. As it exists in the kidney or plasma of a patient, big renin is less active than normal renin, but its enzymatic activity is greatly enhanced by exposure to pH values of 3.0 to 3.6 or by brief incubation with pepsin or trypsin. Use of the terms prorenin and zymogen might be withheld until big renin is shown to exist in normal tissue or plasma and to be converted to normal renin in vivo. To date, big renin has been found in renal tumors and other abnormal kidney tissues as well as in the plasma of patients with renal disorders. The remarkable activation of big renin at pH levels of 3.3 can be used to detect its presence. If a method involving acidification is used to quantitate plasma renin activity of a patient with circulating big renin, the activated plasma renin activity greatly exceeds that measured in plasma maintained at neutral pH. Gel filtration of plasma is used to prove the presence of big renin. When large amounts of big renin are secreted by a renal tumor, hyperfusion may ensue and be cured by removal of the tumor. The secretion of small amounts of big renin does not necessarily result in any physiologic disorder. However, if there is a concomitant diminution or absence of normal renin a state of apparent hyporeninemia exists, as we have observed in diabetic nephropathy; this may be associated with hypoaldosteronism and hyperkalemia. Big renin does not appear to respond to physiologic changes that stimulate or suppress normal plasma renin activity. The finding of big renin may indicate the presence of certain renin-secreting renal tumors or other renal disorders, especially diabetic nephropathy." @default.
• W2078443710 created "2016-06-24" @default.
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• W2078443710 date "1976-03-01" @default.
• W2078443710 modified "2023-09-24" @default.
• W2078443710 title "Big renin: Identification, chemical properties and clinical implications" @default.
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• W2078443710 doi "https://doi.org/10.1016/0002-9149(76)90412-4" @default.
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