Transgenic overexpression of Angptl4 in the mouse heart inhibited cardiac lipoprotein lipase activity and increased fasting plasma triglyceride levels to 133.1 mg/dl compared to 58.4 mg/dl in controls.
Absolute Event Rate: 133.1% vs 58.4%
p-value: p=<0.0001
To investigate the role of Angptl4, an inhibitor of lipoprotein lipase that is induced by >3-fold in the heart after rosiglitazone treatment, we generated transgenic mice that overexpress Angptl4 in the heart (MHC-Angptl4). We show that MHC-Angptl4 mice exhibit cardiac-restricted expression of the transgene and inhibition of cardiac lipoprotein lipase (LPL) activity. However, LPL activities in other tissues or that released into plasma by heparin are not affected. In addition, MHC-Angptl4 mice also exhibit hypertriglyceridemia after 6 h of fasting. We use echocardiography to show that MHC-Angptl4 mice develop left-ventricular dysfunction. Comparison of the metabolic profiles of isolated working hearts demonstrates that cardiac impairment in MHC-Angptl4 mice is positively associated with decreased triglyceride (TG) utilization. When bred to transgenic mice that overexpress acyl-CoA synthetase in the heart, a strain that exhibits elevated cardiac TG accumulation, cardiac TG content in double transgenic mice is reversed to that of wild-type mice. Taken together, our data support the hypothesis that induction of Angptl4 in the heart inhibits lipoprotein-derived fatty acid delivery. This mouse model will be useful to elucidate the role of reduced fatty acid supply in the pathogenesis of heart failure and related disorders.
Yu et al. (Wed,) conducted a other in Cardiomyopathy / Lipid metabolism. Transgenic overexpression of Angptl4 in the heart (MHC-Angptl4) vs. Wild-type littermates was evaluated on Fasting plasma triglyceride levels (mg/dl) (p=<0.0001). Transgenic overexpression of Angptl4 in the mouse heart inhibited cardiac lipoprotein lipase activity and increased fasting plasma triglyceride levels to 133.1 mg/dl compared to 58.4 mg/dl in controls.