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- W2154133047 abstract "Evidence exists that protein kinase C and the mammalian target of rapamycin are important regulators of cardiac hypertrophy. We examined the contribution of these signaling kinases to cardiac growth in spontaneously hypertensive rats (SHRs). Systolic blood pressure was increased ( P <0.001) at 10 weeks in SHRs versus Wistar-Kyoto controls (162±3 versus 128±1 mm Hg) and was further elevated ( P <0.001) at 17 weeks in SHRs (184±7 mm Hg). Heart:body weight ratio was not different between groups at 10 weeks but was 22% greater ( P <0.01) in SHRs versus Wistar-Kyoto controls at 17 weeks. At 10 weeks, activation of Akt and S6 ribosomal protein was greater ( P <0.01) in SHRs but returned to normal by 17 weeks. In contrast, SHRs had protein kinase C activation only at 17 weeks. To determine whether mammalian target of rapamycin regulates the initial development of hypertrophy, rats were treated with rapamycin (2 mg/kg per day IP) or saline vehicle from 13 to 16 weeks of age. Rapamycin inhibited cardiac mammalian target of rapamycin in SHRs, as evidenced by reductions ( P <0.001) in phosphorylation of S6 ribosomal protein and eukaryotic translation initiation factor-4E binding protein 1. Rapamycin treatment also reduced ( P <0.001) heart weight and hypertrophy by 47% and 53%, respectively, in SHRs in spite of increased ( P <0.001) systolic blood pressure versus untreated SHRs (213±8 versus 189±6 mm Hg). Atrial natriuretic peptide, brain natriuretic peptide, and cardiac function were unchanged between SHRs treated with rapamycin or vehicle. These data show that mammalian target of rapamycin is required for the development of cardiac hypertrophy evoked by rising blood pressure in SHRs." @default.
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- W2154133047 date "2009-12-01" @default.
- W2154133047 modified "2023-10-18" @default.
- W2154133047 title "Mammalian Target of Rapamycin Is a Critical Regulator of Cardiac Hypertrophy in Spontaneously Hypertensive Rats" @default.
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- W2154133047 doi "https://doi.org/10.1161/hypertensionaha.109.138818" @default.
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