Spatiotemporal contact between peroxisomes and lipid droplets regulates fasting-induced lipolysis via PEX5

Jinuk Kong, Yul Ji, Yong Geun Jeon, Ji Seul Han, Kyung Hee Han, Jung Hyun Lee, Gung Lee, Hagoon Jang, Sung Sik Choe, Myriam Baes and Jae Bum Kim ()
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Jinuk Kong: Seoul National University
Yul Ji: Seoul National University
Yong Geun Jeon: Seoul National University
Ji Seul Han: Seoul National University
Kyung Hee Han: Seoul National University
Jung Hyun Lee: Seoul National University
Gung Lee: Seoul National University
Hagoon Jang: Seoul National University
Sung Sik Choe: Seoul National University
Myriam Baes: KU Leuven
Jae Bum Kim: Seoul National University

Nature Communications, 2020, vol. 11, issue 1, 1-16

Abstract: Abstract Lipid droplets (LDs) are key subcellular organelles for regulating lipid metabolism. Although several subcellular organelles participate in lipid metabolism, it remains elusive whether physical contacts between subcellular organelles and LDs might be involved in lipolysis upon nutritional deprivation. Here, we demonstrate that peroxisomes and peroxisomal protein PEX5 mediate fasting-induced lipolysis by stimulating adipose triglyceride lipase (ATGL) translocation onto LDs. During fasting, physical contacts between peroxisomes and LDs are increased by KIFC3-dependent movement of peroxisomes toward LDs, which facilitates spatial translocations of ATGL onto LDs. In addition, PEX5 could escort ATGL to contact points between peroxisomes and LDs in the presence of fasting cues. Moreover, in adipocyte-specific PEX5-knockout mice, the recruitment of ATGL onto LDs was defective and fasting-induced lipolysis is attenuated. Collectively, these data suggest that physical contacts between peroxisomes and LDs are required for spatiotemporal translocation of ATGL, which is escorted by PEX5 upon fasting, to maintain energy homeostasis.

Date: 2020
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DOI: 10.1038/s41467-019-14176-0

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