文章基本信息

标题：TFAM expression in brown adipocytes confers obesity resistance by secreting extracellular vesicles that promote self-activation
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作者：Masakazu Fujii ; Daiki Setoyama ; Kazuhito Gotoh 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2022
卷号：25
期号：9
页码：1-26
DOI：10.1016/j.isci.2022.104889
语种：English
出版社：Elsevier
摘要：SummaryThe occurrence of diet-induced obesity has been increasing worldwide and has become a major health concern. Mitochondria are densely distributed in brown adipose tissue and are involved in lipid consumption. Therefore, increasing energy expenditure through the activation of brown adipocytes may be a potential therapy for obesity. Our findings showed that mitochondrial transcription factor A (TFAM) homozygous transgenic (TgTg) mice had highly activated brown adipocytes and increased expression of oxidative phosphorylation, leading to resistance to obesity. Transplantation models of TFAM-expressing brown adipocytes could mimic the phenotype of TFAM TgTg mice, and proving their anti-obesity effect. We found that brown adipocytes secrete exosomes which enable self-activation in an autocrine and paracrine manner. The secretion was enhanced in TFAM TgTg brown adipocytes, resulting in a higher activation. These findings may lead to a promising treatment strategy for obesity through selective stimulation of exosome secretion.Graphical abstractDisplay OmittedHighlights•Human TFAM overexpression in BAT promotes strong anti-obesity effects•Increasing mitochondrial function in hTFAM TgTg mice facilitates EVs secretion•Enhanced EV released in TgTg brown adipocytes induce self-differentiation/activationMolecular biology, Cell biology, Human metabolism