Expression of the Splicing Factor Gene SFRS10 Is Reduced in Human Obesity and Contributes to Enhanced Lipogenesis

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• 作者：Jussi Pihlajamä ; ki¹ ; ⁴ ; ⁵ ; ¹³ ; Carles Lerin¹ ; ⁷ ; ¹³ ; Paula Itkonen⁴ ; Tanner Boes¹ ; Thomas Floss⁸ ; Joshua Schroeder¹ ; Farrell Dearie¹ ; Sarah Crunkhorn¹ ; Furkan Burak¹ ; Josep  ; C. Jimenez-Chillaron¹ ; Tiina Kuulasmaa⁴ ; Pekka Miettinen⁶ ; Peter  ; J. Park² ; Imad Nasser³ ; Zhenwen Zhao⁹ ; Zhaiyi Zhang¹⁰ ; Yan Xu⁹ ; Wolfgang Wurst⁸ ; ¹¹ ; ¹² ; Hongmei Ren¹⁰ ; Andrew  ; J. Morris¹⁰ ; Stefan Stamm¹⁰ ; Allison  ; B. Goldfine¹ ; Markku Laakso⁴ ; Mary  ; Elizabeth Patti¹ ; ^{mary.elizabeth.patti@joslin.harvard.edu"" rel=""nofollow}
• 刊名：Cell Metabolism
• 出版年：2011
• 出版时间：3 August 2011
• 年：2011
• 卷：14
• 期：2
• 页码：208-218
• 全文大小：738 K

文摘

Summary

Alternative mRNA splicing provides transcript diversity and may contribute to human disease. We demonstrate that expression of several genes regulating RNA processing is decreased in both liver and skeletal muscle of obese humans. We evaluated a representative splicing factor, SFRS10, downregulated in both obese human liver and muscle and in high-fat-fed mice, and determined metabolic impact of reduced expression. SFRS10-specific siRNA induces lipogenesis and lipid accumulation in hepatocytes. Moreover, Sfrs10 heterozygous mice have increased hepatic lipogenic gene expression, VLDL secretion, and plasma triglycerides. We demonstrate that LPIN1, a key regulator of lipid metabolism, is a splicing target of SFRS10; reduced SFRS10 favors the lipogenic β isoform of LPIN1. Importantly, LPIN1β-specific siRNA abolished lipogenic effects of decreased SFRS10 expression. Together, our results indicate that reduced expression of SFRS10, as observed in tissues from obese humans, alters LPIN1 splicing, induces lipogenesis, and therefore contributes to metabolic phenotypes associated with obesity.