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- W2106039672 abstract "Rationale : The (pro)renin receptor [(P)RR], encoded in ATP6AP2 , plays a key role in the activation of local renin-angiotensin system (RAS). A truncated form of (P)RR, termed M8.9, was also found to be associated with the vacuolar H + -ATPase (V-ATPase), implicating a non–RAS-related function of ATP6AP2. Objective : We investigated the role of (P)RR/ATP6AP2 in murine cardiomyocytes. Methods and Results : Cardiomyocyte-specific ablation of Atp6ap2 resulted in lethal heart failure; the cardiomyocytes contained RAB7- and lysosomal-associated membrane protein 2 (LAMP2)-positive multivesicular vacuoles, especially in the perinuclear regions. The myofibrils and mitochondria remained at the cell periphery. Cardiomyocyte death was accompanied by numerous autophagic vacuoles that contained undigested cellular constituents, as a result of impaired autophagic degradation. Notably, ablation of Atp6ap2 selectively suppressed expression of the V O subunits of V-ATPase, resulting in deacidification of the intracellular vesicles. Furthermore, the inhibition of intracellular acidification by treatment with bafilomycin A1 or chloroquine reproduced the phenotype observed for the (P)RR/ATP6AP2-deficient cardiomyocytes. Conclusions : Genetic ablation of Atp6ap2 created a loss-of-function model for V-ATPase. The gene product of ATP6AP2 is considered to act as in 2 ways: (1) as (P)RR, exerting a RAS-related function; and (2) as the V-ATPase-associated protein, exerting a non–RAS-related function that is essential for cell survival." @default.
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- W2106039672 date "2010-07-09" @default.
- W2106039672 modified "2023-10-17" @default.
- W2106039672 title "The (Pro)renin Receptor/ATP6AP2 is Essential for Vacuolar H <sup>+</sup> -ATPase Assembly in Murine Cardiomyocytes" @default.
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- W2106039672 doi "https://doi.org/10.1161/circresaha.110.224667" @default.
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