1. Hepatic posttranscriptional network comprised of CCR4–NOT deadenylase and FGF21 maintains systemic metabolic homeostasis
- Author
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Akinori Takahashi, Sakie Katsumura, René St-Arnaud, Ola Larsson, Vincent Giguère, Tadashi Yamamoto, Hiroshi Kiyonari, Masahiro Morita, Takeshi Nagashima, Nahum Sonenberg, Nadeem Siddiqui, Christopher Rouya, Bahareh Hekmatnejad, Mengwei Zang, Mariko Okada-Hatakeyama, Yuichi Oike, and Ivan Topisirovic
- Subjects
FGF21 ,Protein subunit ,Tristetraprolin ,Regulator ,Adipokine ,Adipose tissue ,Mice, Transgenic ,Biology ,Diet, High-Fat ,03 medical and health sciences ,Paracrine signalling ,Mice ,0302 clinical medicine ,Ribonucleases ,Animals ,Homeostasis ,Humans ,RNA, Messenger ,Cells, Cultured ,030304 developmental biology ,Metabolic Syndrome ,0303 health sciences ,Multidisciplinary ,Cell biology ,Fibroblast Growth Factors ,Liver ,PNAS Plus ,Exoribonucleases ,Hepatocytes ,030217 neurology & neurosurgery - Abstract
Whole-body metabolic homeostasis is tightly controlled by hormone-like factors with systemic or paracrine effects that are derived from nonendocrine organs, including adipose tissue (adipokines) and liver (hepatokines). Fibroblast growth factor 21 (FGF21) is a hormone-like protein, which is emerging as a major regulator of whole-body metabolism and has therapeutic potential for treating metabolic syndrome. However, the mechanisms that control FGF21 levels are not fully understood. Herein, we demonstrate that FGF21 production in the liver is regulated via a posttranscriptional network consisting of the CCR4–NOT deadenylase complex and RNA-binding protein tristetraprolin (TTP). In response to nutrient uptake, CCR4–NOT cooperates with TTP to degrade AU-rich mRNAs that encode pivotal metabolic regulators, including FGF21. Disruption of CCR4–NOT activity in the liver, by deletion of the catalytic subunit CNOT6L, increases serum FGF21 levels, which ameliorates diet-induced metabolic disorders and enhances energy expenditure without disrupting bone homeostasis. Taken together, our study describes a hepatic CCR4–NOT/FGF21 axis as a hitherto unrecognized systemic regulator of metabolism and suggests that hepatic CCR4–NOT may serve as a target for devising therapeutic strategies in metabolic syndrome and related morbidities.
- Published
- 2019