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A novel anti-inflammatory role for spleen-derived interleukin-10 in obesity-induced hypothalamic inflammation
Authors:Gotoh Koro  Inoue Megumi  Masaki Takayuki  Chiba Seiichi  Shimasaki Takanobu  Ando Hisae  Fujiwara Kansuke  Katsuragi Isao  Kakuma Tetsuya  Seike Masataka  Sakata Toshiie  Yoshimatsu Hironobu
Institution:First Department of Internal Medicine, Faculty of Medicine, Oita University, Hasama, Yufu, Japan. gotokoro@med.oita-u.ac.jp
Abstract:Obesity can be associated with systemic low-grade inflammation that contributes to obesity-related metabolic disorders. Recent studies raise the possibility that hypothalamic inflammation contributes to the pathogenesis of diet-induced obesity (DIO), while another study reported that obesity decreases the expression of pro-inflammatory cytokines in spleen. The following study examines the hypothesis that obesity suppresses the splenic synthesis of the anti-inflammatory cytokine, interleukin (IL)-10, thereby resulting in chronic hypothalamic inflammation. The results showed that due to oxidative stress or apoptosis, the synthesis of splenic IL-10 was decreased in DIO when compared with non-obesity rats. Splenectomy (SPX) accelerated DIO-induced inflammatory responses in the hypothalamus. Interestingly, SPX suppressed the DIO-induced increases in food intake and body weight and led to a hypothalamic pro-inflammatory state that was similar to that produced by DIO, indicating that hypothalamic inflammation exerts a dual effect on energy metabolism. These SPX-induced changes were inhibited by the systemic administration of IL-10. Moreover, SPX had no effect on hypothalamic inflammatory responses in IL-10-deficient mice. These data suggest that spleen-derived IL-10 plays an important role in the prevention of hypothalamic inflammation and may be a therapeutic target for the treatment of obesity and hypothalamic inflammation.
Keywords:hypothalamic inflammation  IL‐10  Obesity  spleen
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