Effects of insulin and transgenic overexpression of UDP-glucose pyrophosphorylase on UDP-glucose and glycogen accumulation in skeletal muscle fibers.
Effects of insulin and transgenic overexpression of UDP-glucose pyrophosphorylase on UDP-glucose and glycogen accumulation in skeletal muscle fibers.
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胰岛素和 UDP-葡萄糖焦磷酸化酶转基因过表达对骨骼肌纤维中 UDP-葡萄糖和糖原积累的影响。
DOI:
10.1074/jbc.m413614200
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发表时间:
2005
期刊:
影响因子:
--
通讯作者:
LawrenceJr,JohnC
中科院分区:
文献类型:
--
作者:
Reynolds4th,ThomasH;Pak,Yunbae;Harris,ThurlE;Manchester,Jill;Barrett,EugeneJ;LawrenceJr,JohnC
UDP-glucose (UDP-Glc) and glycogen levels in skeletal muscle fibers of defined fiber type were measured using microanalytical methods. Infusing rats with insulin increased glycogen in both Type I and Type II fibers. Insulin was without effect on UDP-Glc in Type I fibers but decreased UDP-Glc by 35–40% in Type IIA/D and Type IIB fibers. The reduction in UDP-Glc suggested that UDP-Glc pyrophosphorylase (PPL) activity might limit glycogen synthesis in response to insulin. To explore this possibility, we generated mice overexpressing a UDP-Glc PPL transgene in skeletal muscle. The transgene increased both UDP-Glc PPL activity and levels of UDP-Glc in skeletal muscles by ∼3-fold. However, overexpression of UDP-Glc PPL was without effect on either the levels of skeletal muscle glycogen or glucose tolerancein vivo. The transgene was also without effect on either control or insulin-stimulated rates of14C-glucose incorporation into glycogen in muscles incubatedin vitro. The results indicate that UDP-Glc PPL activity is not limiting for glycogen synthesis.
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