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Disruption of the striated muscle glycogen targeting subunit PPP1R3A of protein phosphatase 1 leads to increased weight gain, fat deposition, and development of insulin resistance.

Diabetes. 2003 Mar;52(3):596-604. doi:10.2337/diabetes.52.3.596
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摘要


Disruption of the PPP1R3A gene encoding the glycogen targeting subunit (G(M)/R(GL)) of protein phosphatase 1 (PP1) causes substantial lowering of the glycogen synthase activity and a 10-fold decrease in the glycogen levels in skeletal muscle. Homozygous G(M)(-/-) mice show increased weight gain after 3 months of age and become obese, weighing approximately 20% more than their wild-type (WT) littermates after 12 months of age. Glucose tolerance is impaired in 11-month-old G(M)(-/-) mice, and their skeletal muscle is insulin-resistant at > or =12 months of age. The massive abdominal and other fat depositions observed at this age are likely to be a consequence of impaired blood glucose utilization in skeletal muscle. PP1-G(M) activity, assayed after specific immunoadsorption, was absent from G(M)(-/-) mice and stimulated in the hind limb muscles of WT mice by intravenous infusion of insulin. PP1-R5/PTG, another glycogen targeted form of PP1, was not significantly stimulated by insulin in the skeletal muscle of WT mice but showed compensatory stimulation by insulin in G(M)(-/-) mice. Our results suggest that dysfunction of PP1-G(M) may contribute to the pathophysiology of human type 2 diabetes.

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