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SAMM50 Regulates Thermogenesis of Beige Adipocytes Differentiated from Human Adipose-Derived Stem Cells by Balancing Mitochondrial Dynamicsopen access

Authors
Park, Se-JunShon, Dong-HyunKim, Jae-HyunRyu, Yang-HwanKo, Yong
Issue Date
Jun-2022
Publisher
MDPI
Keywords
adipose-derived stem cells; thermogenic adipocytes; mitochondrial dynamics; obesity; SAMM50; UCP1
Citation
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, v.23, no.12
Indexed
SCIE
SCOPUS
Journal Title
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume
23
Number
12
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/142811
DOI
10.3390/ijms23126764
ISSN
1661-6596
1422-0067
Abstract
Brown/beige adipocyte thermogenesis is a process that is important for energy balance. The thermogenesis of brown/beige adipocytes occurs in the mitochondria, which is modulated by the dynamic balance between mitochondrial fusion and fission. Mitophagy is also involved in mitochondrial dynamics. The sorting and assembly machinery (SAM) complex protein, SAMM50, plays a key role in mitochondrial dynamics and quality control through regulating mitophagy. However, the roles of SAMM50 in the thermogenesis of beige adipocytes remain unknown. Thus, the objective of this study was to conduct functional analyses of SAMM50. The expression of mitochondrial fusion genes was repressed by SAMM50 knockdown but was not altered by SAMM50 overexpression. These results agreed with the distribution of the fluorescence-stained mitochondria and an mtDNA copy number. In contrast, the expression of mitochondrial fission genes showed an opposite outcome. As a result, suppression by the SAMM50 shRNA inhibited the expression of thermogenic genes (UCP1, PPARGC1A, DIO2, ELOVL3, CIDEA, and CIDEC) and mitochondrial-related genes (CYCS, COX7A1, TFAM, CPT1B, and CPT2). Conversely, SAMM50 overexpression promoted the expression of the thermogenic genes and mitochondrial genes. Thus, SAMM50 links the balance between the mitochondrial dynamics and thermogenesis of beige adipocytes.
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