한빛사논문
Eun-Ji Park1,6, Hyun-Soo Kim1,6, Do-Hyoung Lee1, Su-Min Kim1, Joon-Sup Yoon1, Ji-Min Lee2, Se Jin Im3, Ho Lee4, Min-Woo Lee2 & Chang-Woo Lee1,5
1Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.
2Department of Integrated Biomedical Science and Soonchunhyang Institute of Medi-bio Science (SIMS), Soonchunhyang University, Cheonan, Republic of Korea.
3Department of Immunity, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea.
4Graduate School of Cancer Science and Policy, Research Institute, National Cancer Center, Goyang, Republic of Korea.
5Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea.
6These authors contributed equally: Eun-Ji Park, Hyun-Soo Kim.
Corresponding authors : Correspondence to Hyun-Soo Kim, Min-Woo Lee or Chang-Woo Lee.
Abstract
Brown adipose tissue (BAT) plays a pivotal role in maintaining body temperature and energy homeostasis. BAT dysfunction is associated with impaired metabolic health. Here, we show that Ssu72 phosphatase is essential for mRNA translation of genes required for thermogenesis in BAT. Ssu72 is found to be highly expressed in BAT among adipose tissue depots, and the expression level of Ssu72 is increased upon acute cold exposure. Mice lacking adipocyte Ssu72 exhibit cold intolerance during acute cold exposure. Mechanistically, Ssu72 deficiency alters cytosolic mRNA translation program through hyperphosphorylation of eIF2α and reduces translation of mitochondrial oxidative phosphorylation (OXPHOS) subunits, resulting in mitochondrial dysfunction and defective thermogenesis in BAT. In addition, metabolic dysfunction in Ssu72-deficient BAT returns to almost normal after restoring Ssu72 expression. In summary, our findings demonstrate that cold-responsive Ssu72 phosphatase is involved in cytosolic translation of key thermogenic effectors via dephosphorylation of eIF2α in brown adipocytes, providing insights into metabolic benefits of Ssu72.
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