Molecular and functional characterization of glycogen synthase in the porcine satellite cells under insulin treatment

Molecular and functional characterization of glycogen synthase in the porcine satellite cells under insulin treatment
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胰岛素处理下猪卫星细胞糖原合酶的分子和功能表征

DOI:
10.1007/s11010-011-1054-4
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发表时间:
2011
影响因子:
4.3
通讯作者:
Dequan Xu
Dequan Xu
中科院分区:
生物学3区
文献类型:
--
作者:
Linjie Wang;Yuanzhu Xiong;Bo Zuo;Minggang Lei;Zhuqing Ren;Dequan Xu

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糖原合成酶(GS)催化糖原合成的关键步骤,在肝脏和肌肉的糖原代谢中起重要作用。本研究克隆了猪糖原合成基因GYS 1和GYS 2的cDNA和启动子序列。表达分析表明,猪GYS 1在骨骼肌和心脏中高表达,GYS 2在肝脏和皮下脂肪组织中特异性表达。猪卫星细胞从增殖到分化过程中GYS 1的表达水平上调,胰岛素对GYS 1的转录水平无明显影响。胰岛素刺激72 h分化的卫星细胞,表现为GS磷酸化水平降低,但不影响GYS 1转录和总GS蛋白水平,表明胰岛素的作用主要是通过转录后调控介导的,而不是在转录水平上调节。在猪GYS 1基因启动子和cDNA序列中检测到4个单核苷酸多态性(SNP)。关联分析显示,GYS 1Hin 6 I和MvaI多态性均与M的pH值存在显著关联(P <0.05)。背最长肌(pHLD)、M.股二头肌(biceps femoris,pHBF)和M.死后45 min时的半侧头炎(pHSC)。这些结果为进一步研究猪骨骼肌糖原合酶的功能提供了有用的信息。
Glycogen synthase (GS) catalyzes the key step of glycogen synthesis and plays an important role in glycogen metabolism in liver and muscle. In this study, we cloned the cDNA and promoter sequences of porcine glycogen synthesis genes (GYS1andGYS2). Expression analysis revealed that porcineGYS1was highly expressed in the skeletal muscle and heart.GYS2was expressed specifically in liver and subcutaneous adipose tissue. The expression level ofGYS1was up-regulated from proliferation to differentiation in the porcine satellite cells, and insulin did not significantly affect the transcription ofGYS1. Insulin stimulated 72-h-differentiated satellite cells as indicated by decrease in phosphorylation of GS, but did not affectGYS1transcription and total GS protein level, suggesting that the effect of insulin is primarily mediated via posttranscriptional control rather than regulated at the transcriptional level. Four single-nucleotide polymorphisms (SNPs) were detected in the promoter and cDNA sequences of porcineGYS1. Association analyses revealed that the GYS1Hin6I andMvaI polymorphisms both had significant associations (P< 0.05) with pH ofM. longissimus dorsi(pHLD),M. biceps femoris(pHBF) andM. semipinalis capitis(pHSC) at 45 min postmortem. These results provide useful information for further investigation on the function of glycogen synthase in porcine skeletal muscle.
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