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- W2122945293 abstract "Evidence of endogenous angiotensin-(1-12) [Ang-(1-12)] may necessitate revision of the accepted view that Ang I is the immediate peptide product derived from the precursor protein angiotensinogen. As the processing of this peptide has not been fully elucidated, we characterized Ang-(1-12) metabolism in the serum and kidney of the mRen2.Lewis rat, a model of high circulating renin and ACE expression. A sensitive HPLC-based method to detect the metabolism ex vivo of low concentrations of (125)I-labeled Ang-(1-12) was utilized. Ang-(1-12) processing to serum did not reveal the participation of renin; however, serum ACE readily converted Ang-(1-12) to Ang I with subsequent metabolism to Ang II. Ang I and Ang II forming activities for serum ACE were 102±4 and 104±3 fmol/ml/min serum (n=3), respectively, and both products were abolished by the potent ACE inhibitor lisinopril. The metabolism of Ang-(1-12) in renal cortical membranes also revealed the formation of Ang I; however, the main products were Ang-(1-7) and Ang-(1-4) at 129±9 and 310±12 fmol/mg/min protein (n=4), respectively. Neprilysin inhibition abolished these products and substantially reduced the overall metabolism of Ang-(1-12). Incubation of Ang-(1-12) with either human or mouse neprilysin revealed identical products. We conclude that endogenous Ang-(1-12) may contribute to the expression of biologically active angiotensins through a renin-independent pathway. The preferred route for Ang-(1-12) metabolism likely reflects the relative tissue content of ACE and neprilysin." @default.
- W2122945293 created "2016-06-24" @default.
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- W2122945293 date "2012-06-01" @default.
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- W2122945293 title "Divergent pathways for the angiotensin-(1–12) metabolism in the rat circulation and kidney" @default.
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- W2122945293 doi "https://doi.org/10.1016/j.peptides.2012.03.025" @default.
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