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首页> 外文期刊>Molecular and Cellular Biology >Transient Neonatal Diabetes Mellitus Gene Zac1 Impairs Insulin Secretion in Mice through Rasgrf1
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Transient Neonatal Diabetes Mellitus Gene Zac1 Impairs Insulin Secretion in Mice through Rasgrf1

机译:暂时性新生儿糖尿病基因Zac1通过Rasgrf1损害小鼠的胰岛素分泌

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The biallelic expression of the imprinted gene ZAC1/PLAGL1 underlies ~60% of all cases of transient neonatal diabetes mellitus (TNDM) that present with low perinatal insulin secretion. Molecular targets of ZAC1 misexpression in pancreatic β cells are unknown. Here, we identified the guanine nucleotide exchange factor Rasgrf1 as a direct Zac1/Plagl1 target gene in murine β cells. Doubling Zac1 expression reduced Rasgrf1 expression, the stimulus-induced activation of mitogen-activated protein kinase (MAPK) and phosphoinositide 3-kinase (PI3K) pathways, and, ultimately, insulin secretion. Normalizing Rasgrf1 expression reversed this phenotype. Moreover, the transplantation of Zac1-overexpressing β cells failed to reinstate euglycemia in experimental diabetic mice. In contrast, Zac1 expression did not interfere with the signaling of the glucagon-like peptide 1 receptor (GLP-1R), and the GLP-1 analog liraglutide improved hyperglycemia in transplanted experimental diabetic mice. This study unravels a mechanism contributing to insufficient perinatal insulin secretion in TNDM and raises new prospects for therapy.
机译:印记基因 ZAC1 / PLAGL1 的双等位基因表达占所有围产期胰岛素分泌低的短暂性新生儿糖尿病(TNDM)病例的约60%。胰腺β细胞中ZAC1错误表达的分子靶标尚不清楚。在这里,我们确定了鸟嘌呤核苷酸交换因子 Rasgrf1 是鼠类β细胞中直接的Zac1 / Plagl1靶基因。 Zac1表达增加一倍会降低Rasgrf1表达,刺激诱导的丝裂原活化蛋白激酶(MAPK)和磷酸肌醇3激酶(PI3K)通路的激活,并最终导致胰岛素分泌。标准化Rasgrf1表达可逆转此表型。此外,在实验性糖尿病小鼠中,过表达Zac1的β细胞的移植未能恢复正常血糖。相反,Zac1表达不干扰胰高血糖素样肽1受体(GLP-1R)的信号传导,而GLP-1类似物利拉鲁肽可改善移植的实验性糖尿病小鼠的高血糖症。这项研究揭示了导致TNDM围产期胰岛素分泌不足的机制,并为治疗提供了新的前景。

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