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Kristóf E, Klusóczki Á, Veress R, Shaw A, Combi ZS, Varga K, Győry F, Balajthy Z, Bai P, Bacso Z, Fésüs L. Interleukin-6 released from differentiating human beige adipocytes improves browning. Exp Cell Res 2019; 377:47-55. [PMID: 30794803 DOI: 10.1016/j.yexcr.2019.02.015] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 01/30/2019] [Accepted: 02/18/2019] [Indexed: 01/12/2023]
Abstract
Brown and beige adipocytes contribute significantly to the regulation of whole body energy expenditure and systemic metabolic homeostasis not exclusively by thermogenesis through mitochondrial uncoupling. Several studies have provided evidence in rodents that brown and beige adipocytes produce a set of adipokines ("batokines") which regulate local tissue homeostasis and have beneficial effects on physiological functions of the entire body. We observed elevated secretion of Interleukin (IL)-6, IL-8 and monocyte chemoattractant protein (MCP)-1, but not tumor necrosis factor alpha (TNFα) or IL-1β pro-inflammatory cytokines, by ex vivo differentiating human beige adipocytes (induced by either PPARγ agonist or irisin) compared to white. Higher levels of IL-6, IL-8 and MCP-1 were released from human deep neck adipose tissue biopsies (enriched in browning cells) than from subcutaneous ones. IL-6 was produced in a sustained manner and mostly by the adipocytes and not by the undifferentiated progenitors. Continuous blocking of IL-6 receptor by specific antibody during beige differentiation resulted in downregulation of brown marker genes and increased morphological changes that are characteristic of white adipocytes. The data suggest that beige adipocytes adjust their production of IL-6 to reach an optimal level for differentiation in the medium enhancing browning in an autocrine manner.
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Affiliation(s)
- Endre Kristóf
- Laboratory of Cell Biochemistry, Department of Biochemistry and Molecular Biology, University of Debrecen, Faculty of Medicine, Debrecen, Hungary
| | - Ágnes Klusóczki
- Laboratory of Cell Biochemistry, Department of Biochemistry and Molecular Biology, University of Debrecen, Faculty of Medicine, Debrecen, Hungary
| | - Roland Veress
- Laboratory of Cell Biochemistry, Department of Biochemistry and Molecular Biology, University of Debrecen, Faculty of Medicine, Debrecen, Hungary
| | - Abhirup Shaw
- Laboratory of Cell Biochemistry, Department of Biochemistry and Molecular Biology, University of Debrecen, Faculty of Medicine, Debrecen, Hungary
| | - Zsolt Sándor Combi
- Laboratory of Cell Biochemistry, Department of Biochemistry and Molecular Biology, University of Debrecen, Faculty of Medicine, Debrecen, Hungary
| | - Klára Varga
- Laboratory of Cell Biochemistry, Department of Biochemistry and Molecular Biology, University of Debrecen, Faculty of Medicine, Debrecen, Hungary
| | - Ferenc Győry
- Department of Surgery, University of Debrecen, Faculty of Medicine, Debrecen, Hungary
| | - Zoltán Balajthy
- Laboratory of Cell Biochemistry, Department of Biochemistry and Molecular Biology, University of Debrecen, Faculty of Medicine, Debrecen, Hungary
| | - Péter Bai
- MTA-DE Lendület Laboratory of Cellular Metabolism, Debrecen, Hungary; Research Center for Molecular Medicine, University of Debrecen, Faculty of Medicine, Debrecen, Hungary; Department of Medical Chemistry, University of Debrecen, Faculty of Medicine, Debrecen, Hungary
| | - Zsolt Bacso
- Department of Biophysics and Cell Biology, University of Debrecen, Faculties of Medicine and Pharmacy, Debrecen, Hungary
| | - László Fésüs
- Laboratory of Cell Biochemistry, Department of Biochemistry and Molecular Biology, University of Debrecen, Faculty of Medicine, Debrecen, Hungary; MTA-DE Stem Cells, Apoptosis and Genomics Research Group of the Hungarian Academy of Sciences, Debrecen, Hungary.
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