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- W2809781758 abstract "Introduction: As importantly underscored by the SPRINT Trial, innovative blood pressure (BP) lowering and multiorgan protective drugs are needed for treating hypertension (HTN). We engineered a Mayo Clinic designer atrial natriuretic peptide (ANP)-based drug, ZD100, which possesses a unique 12 amino acid (AA) carboxy-terminus (CT) extension while maintaining the N-terminus (NT) of ANP. ZD100 is more potent than ANP in reducing BP, inducing natriuresis and inhibiting aldosterone via pGC-A and its second messenger cGMP. To date, the in vivo actions of ZD100 in a model of essential HTN are undefined. Further, in attempt to enhance and/or minimize pGC-A activation, the importance of specific AAs in the CT and NT of ZD100 is unknown and is critical to define. Hypothesis: We hypothesize that ZD100 is a potent anti-HTN drug activating pGC-A/cGMP system and that specific AA variations in the CT and/or NT of ZD100 will modify the ability of activating pGC-A. Methods: Spontaneously hypertensive rats (SHRs) received intravenous (IV) ZD100 or vehicle and BP, plasma and urinary cGMP and the natriuretic effects were determined. We then engineered 15 strategic ZD100 variants (Vs) consisting of mutated peptides in the CT or NT or both. We stimulated HEK293 cells overexpressing pGC-A with ZD100 and the 15 Vs (10-8 M) and measured intracellular cGMP generation. Results: In SHRs, acute IV ZD100 reduced BP, increased plasma and urinary cGMP generation and induced natriuresis demonstrating efficacy in HTN. In vitro, we found two more potent pGC-A activators (+100% cGMP activation) only among the CT-only mutated ZD100 Vs. Importantly, key mutations of either the CT or NT resulted in 6 loss-of-function Vs identifying importance of peptide-receptor dependency. Conclusions: We demonstrate for the first time in a genetic model of HTN that ZD100 reduces BP, activates systemic and renal pGC-A/cGMP and induces natriuresis. Enhanced or reduced pGC-A activation with targeted AA mutations in the CT and NT of ZD100 provides key structure function insights into ZD100 which may lead to next generation ZD100 therapeutic peptides. These findings support ZD100 as a novel peptide therapeutic strategy for HTN and will help guide the selection of best-in-class ZD100 analogues." @default.
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- W2809781758 date "2016-11-11" @default.
- W2809781758 modified "2023-09-24" @default.
- W2809781758 title "Abstract 11603: Structural Insights Into C-terminus and N-terminus of a Designer cGMP Activating ANP-Based Antihypertensive Peptide: ZD100" @default.
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