8月20日,Nature 旗下Cell Death & Differentiation雜志在線發(fā)表了上海生科院吳家睿研究組和廖侃研究組合作取得的最新研究成果,。
隨著現(xiàn)代人生活方式的改變,,肥胖在世界范圍內已經成為影響人類健康的一個重要問題,。肥胖容易導致多種疾病的發(fā)生,如糖尿病,,心血管疾病等,。因此,控制過度肥胖是防止多種代謝相關疾病發(fā)生的有效渠道,。在人體內,,肥胖的發(fā)生,即脂肪組織的過度增長,,是和脂肪細胞的數(shù)量增多和體積增大密切相關的,。所以,了解在體內脂肪細胞的產生過程,明確脂肪細胞分化中的分子機理,,對解決一系列肥胖相關疾病具有重要的現(xiàn)實意義,。
吳家睿研究組的裴鴻娟博士和廖侃研究組的姚遙博士通過研究發(fā)現(xiàn),KLF轉錄因子家族成員KLF9在前脂肪細胞向脂肪細胞分化的過程中起了重要作用,。脂肪細胞分化伴隨著KLF9表達量的增加,,如果抑制KLF9的表達,脂肪細胞的分化將被抑制,。研究進一步發(fā)現(xiàn),,KLF9在分化的中期結合到一個重要的調控分化的轉錄因子: PPARγ基因的啟動子上,促進PPARγ的表達,,從而促進脂肪細胞分化,;并且,KLF9可以和另一個轉錄因子:C/EBPα相互作用,,共同上調PPARγ的表達,。這個研究結果在現(xiàn)有認識的基礎上,進一步闡明了調控脂肪細胞分化的分子機制,,為人們解決肥胖和一系列肥胖相關的健康問題提供了新的思路,。
該研究工作得到中國科學院、科技部重大科學研究計劃,、國家自然科學基金委,、上海市科委的經費資助。(生物谷Bioon.com)
生物谷推薦英文摘要:
Cell Death & Differentiation , (20 August 2010) | doi:10.1038/cdd.2010.100
Krüppel-like factor KLF9 regulates PPARγ transactivation at the middle stage of adipogenesis
H Pei, Y Yao, Y Yang, K Liao and J-R Wu
Krüppel-like factors (KLFs) as a family of zinc-finger transcription factors involve in the regulation of many physiological processes. In these studies, KLF9 was characterized for its role in adipogenesis. The expression of KLF9 was markedly upregulated during the middle stage of 3T3-L1 adipocyte differentiation, and inhibition of KLF9 by RNAi impaired adipogenesis. Using promoter deletion and mutation analysis, we identified two KLF9-binding sites within the 0.6-kb region of the PPARγ2 proximal promoter, indicating that KLF9 interacts with the PPARγ2 promoter. Furthermore, we found that KLF9 could synergistically activate PPARγ2 promoter by directly interacting with C/EBPα. In addition, overexpression of PPARγ2 rescued the impairment of adipocyte differentiation induced by KLF9 knockdown, which supports that PPARγ2 is a downstream target of KLF9. Collectively, our results indicate KLF9 as a key pro-adipogenic transcription factor through regulation of PPARγ2 expression with C/EBPα at the middle stage of adipogenesis.