2017年4月14日, 國際內分泌-糖尿病領域的權威期刊《Diabetes》雜誌上線上發表了北京大學基礎醫學院楊吉春教授團隊題為“NFE2 Induces miR-423-5p to Promote Gluconeogenesis and Hyperglycemia by Repressing Hepatic FAM3A-ATP-Akt Pathway”和“Hepatic Activation of the FAM3C-HSF1-CaM Pathway Attenuates Hyperglycemia of Obese Diabetic Mice”的兩篇研究論文。 論文揭示了以FAM3基因家族成員FAM3A及FAM3C為核心的非胰島素依賴糖脂代謝調控網路。 博士生楊衛利、陳真真和碩士生丁立偉是論文論文第一作者, 楊吉春為兩篇論文通訊作者。
課題組在前期研究中已揭示FAM3A是一個新線粒體蛋白, 其在肝臟表達受抑制的2型糖尿病及非酒精性脂肪肝發生過程中起重要作用。 然而, 糖尿病發生時, 肝臟FAM3A表達受抑制的機制尚不清楚(Hepatology 2014)。 課題組結合生物資訊學預測和一系列細胞生物學手段,
在糖尿病小鼠肝臟組織中, FAM3基因家族另一成員FAM3C表達也顯著降低。 在糖尿病小鼠肝臟特異性過表達FAM3C基因後,
隨著糖尿病病情的發展, 胰島素抵抗及胰島功能衰竭進行性加重,
FAM3A與FAM3C通過功能性及轉錄啟動CaM, 抑制肝臟糖脂異生緩解糖尿病及脂肪肝
原文連結:
NFE2 Induces miR-423-5p to Promote GluconeoGENEsis and Hyperglycemia by Repressing Hepatic FAM3A-ATP-Akt Pathway
原文摘要:
Under obese condition, hepatic FAM3A expressionis repressed, but the underlying mechanism remains unknown. This study determined the role and mechanism of miR-423-5p in hepatic glucose and lipid metabolism by repressing FAM3A expression. miR-423-5p expression was increased in the livers of obese diabetic mice and NAFLD patients with decreased FAM3A expression. miR-423-5p directly targeted FAM3A mRNA to repress its expression and FAM3A-ATP-Akt pathway in cultured hepatocytes. Hepatic miR-423-5p inhibition suppressed gluconeogenesis, and improved insulin resistance, hyperglycemia and fatty liver in obese diabetic mice. In contrast, hepatic miR-423-5p overexpression promoted gluconeogenesis and hyperglycemia, and increased lipid deposition in normal mice. miR-423-5p inhibition activated FAM3A-ATP-Akt pathway, and repressed gluconeogenic and lipogenic gene expression in diabetic mouse livers. miR-423 precursor gene was further shown to be a target gene of NFE2, which induced miR-423-5p expression to repress FAM3A-ATP-Akt pathway in cultured hepatocytes. Hepatic NFE2 overexpression upregulated miR-423-5p to repress FAM3A-ATP-Akt pathway, promoting gluconeogenesis and lipid deposition, and causing hyperglycemia in normal mice. In conclusion: under obese condition, activation of hepatic NFE2/miR-423-5p axis plays important roles in the progression of type 2 diabetes and NAFLD by repressing FAM3A-ATP-Akt signaling pathway.
作者:楊吉春 點擊:次