Adenovirus-mediated overexpression of O-GlcNAcase improves contractile function in the diabetic heart - PubMed (original) (raw)
Adenovirus-mediated overexpression of O-GlcNAcase improves contractile function in the diabetic heart
Ying Hu et al. Circ Res. 2005.
Abstract
To examine whether excessive protein O-GlcNAcylation plays a role in the dysfunction of the diabetic heart, we delivered adenovirus expressing O-GlcNAcase (Adv-GCA) into the myocardium of STZ-induced diabetic mice. Our results indicated that excessive cellular O-GlcNAcylation exists in the diabetic heart, and that in vivo GCA overexpression reduces overall cellular O-GlcNAcylation. Myocytes isolated from diabetic hearts receiving Adv-GCA exhibited improved calcium transients with a significantly shortened T(decay) (P<0.01) and increased sarcoplasmic reticulum Ca2+ load (P<0.01). These myocytes also demonstrated improved contractility including a significant increase in +dL/dt and -dL/dt and greater fractional shortening as measured by edge detection (P<0.01). In isolated perfused hearts, developed pressure and -dP/dt were significantly improved in diabetic hearts receiving Adv-GCA (P<0.05). These hearts also exhibited a 40% increase in SERCA2a expression. Phospholamban protein expression was reduced 50%, but the phosphorylated form was increased 2-fold in the diabetic hearts receiving Adv-GCA. We conclude that excess O-GlcNAcylation in the diabetic heart contributes to cardiac dysfunction, and reducing this excess cellular O-GlcNAcylation has beneficial effects on calcium handling and diabetic cardiac function.
Comment in
- A bittersweet modification: O-GlcNAc and cardiac dysfunction.
Jones SP. Jones SP. Circ Res. 2005 May 13;96(9):925-6. doi: 10.1161/01.RES.0000168039.61228.67. Circ Res. 2005. PMID: 15890978 No abstract available.
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