In type 2 diabetes, HbA1c decreases upon treatment of heart failure with the angiotensin receptor-neprilysin (NEP) inhibitor LCZ696 (LCZ). We sought to determine whether the components of LCZ, the NEP inhibitor sacubitril (SAC) and angiotensin receptor blocker valsartan (VAL), enhance insulin secretion and if so, their effects are additive when combined in LCZ. C57BL/6 mice fed high fat diet (HFD) received injections of vehicle (VEH) or low-dose streptozotocin (3 × 30 mg/kg; STZ), the latter to induce diabetes. Mice were continued for 8 weeks on HFD alone (CTL) or supplemented with LCZ (114 mg/kg/d), SAC (48 mg/kg/d) or VAL (54 mg/kg/d). All drugs significantly reduced body weight gain in both VEH and STZ groups, with LCZ being more effective than SAC (Table). SAC and VAL, but not LCZ, lowered fed and fasting plasma glucose and increased insulin release during an IV glucose tolerance test (IVGTT) in STZ mice only (Table). In VEH and STZ mice, insulin sensitivity was similar among the 4 treatment groups; however, SAC enhanced glucose disposal during IVGTT (Table). None of the treatments altered pancreatic ß- and α-cell mass or lipolysis (not shown). In sum, SAC and VAL exert beneficial anti-obesity, glycemic and insulinotropic effects when given alone in obese and/or diabetic mice. Additional studies are needed to understand why, when SAC and VAL are combined in LCZ, only anti-obesity effects are observed.
N. Esser: None. C.R. Schmidt: None. B. Barrow: None. L. Cronic: None. D.J. Hackney: None. S.M. Mongovin: None. R.L. Hull: None. S. Zraika: Research Support; Self; Novartis Pharmaceuticals Corporation.
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