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Low-Frequency Intermittent Hypoxia Suppresses Subcutaneous Adipogenesis and Induces Macrophage Polarization in Lean Mice

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单位: [1]Department of Medicine, The University of Hong Kong Li Ka Shing Faculty of Medicine, Hong Kong, [2]Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China, [3]Research Centre of Heart, Brain, Hormone and Healthy Aging,The University of Hong Kong Li Ka Shing Faculty of Medicine, Hong Kong [4]Department of Pharmacology & Pharmacy, The University of Hong Kong Li Ka Shing Faculty of Medicine, Hong Kong
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关键词: Adipogenesis Inflammation Hypoxia Macrophages

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Background: The relationship between obstructive sleep apnoea (OSA) and metabolic disorders is complex and highly associated. The impairment of adipogenic capacity in pre-adipocytes may promote adipocyte hypertrophy and increase the risk of further metabolic dysfunction. We hypothesize that intermittent hypoxia (IH), as a pathophysiologic feature of OSA, may regulate adipogenesis by promoting macrophage polarization. Methods: Male C57BL/6N mice were exposed to either IH (240 seconds of 10% O-2 followed by 120 seconds of 21% O-2, i.e., 10 cycles/hour) or intermittent normoxia (IN) for 6 weeks. Stromal-vascular fractions derived from subcutaneous (SUB-SVF) and visceral (VIS-SVF) adipose tissues were cultured and differentiated. Conditioned media from cultured RAW 264.7 macrophages after air (Raw) or IH exposure (Raw-IH) were incubated with SUB-SVF during adipogenic differentiation. Results: Adipogenic differentiation of SUB-SVF but not VIS-SVF from IH-exposed mice was significantly downregulated in comparison with that derived from IN-exposed mice. III-exposed mice compared to IN-exposed mice showed induction of hypertrophic adipocytes and increased preferential infiltration of M1 macrophages in subcutaneous adipose tissue (SAT) compared to visceral adipose tissue. Complementary in vitro analysis demonstrated that Raw-IH media significantly enhanced inhibition of adipogenesis of SUB-SVF compared to Raw media, in agreement with corresponding gene expression levels of differentiation-associated markers and adipogenic transcription factors. Conclusion: Low frequency IH exposure impaired adipogenesis of SAT in lean mice, and macrophage polarization may be a potential mechanism for the impaired adipogenesis.

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出版当年[2018]版:
大类 | 2 区 医学
小类 | 3 区 内分泌学与代谢
最新[2025]版:
大类 | 2 区 医学
小类 | 2 区 内分泌学与代谢
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出版当年[2017]版:
Q2 ENDOCRINOLOGY & METABOLISM
最新[2024]版:
Q1 ENDOCRINOLOGY & METABOLISM

影响因子: 最新[2024版] 最新五年平均[2021-2025] 出版当年[2017版] 出版当年五年平均[2013-2017] 出版前一年[2016版] 出版后一年[2018版]

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第一作者单位: [1]Department of Medicine, The University of Hong Kong Li Ka Shing Faculty of Medicine, Hong Kong, [2]Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China,
通讯作者:
通讯机构: [1]Department of Medicine, The University of Hong Kong Li Ka Shing Faculty of Medicine, Hong Kong, [3]Research Centre of Heart, Brain, Hormone and Healthy Aging,The University of Hong Kong Li Ka Shing Faculty of Medicine, Hong Kong [*1]Division of Respiratory Medicine, Department of Medicine, Queen Mary Hospital, The University of Hong Kong Li Ka Shing Faculty of Medicine, 4/F Professorial Block, 102 Pok Fu Lam Road, Hong Kong
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