PMID- 23269411 OWN - NLM STAT- MEDLINE DCOM- 20130416 LR - 20220410 IS - 1522-1555 (Electronic) IS - 0193-1849 (Print) IS - 0193-1849 (Linking) VI - 304 IP - 5 DP - 2013 Mar 1 TI - Inflammation during obesity is not all bad: evidence from animal and human studies. PG - E466-77 LID - 10.1152/ajpendo.00266.2012 [doi] AB - Chronic inflammation is a characteristic of obesity and is associated with accompanying insulin resistance, a hallmark of type 2 diabetes mellitus (T2DM). Although proinflammatory cytokines are known for their detrimental effects on adipose tissue function and insulin sensitivity, their beneficial effects in the regulation of metabolism have not drawn sufficient attention. In obesity, inflammation is initiated by a local hypoxia to augment angiogenesis and improve adipose tissue blood supply. A growing body of evidence suggests that macrophages and proinflammatory cytokines are essential for adipose remodeling and adipocyte differentiation. Phenotypes of multiple lines of transgenic mice consistently suggest that proinflammatory cytokines increase energy expenditure and act to prevent obesity. Removal of proinflammatory cytokines by gene knockout decreases energy expenditure and induces adult-onset obesity. In contrast, elevation of proinflammatory cytokines augments energy expenditure and decreases the risk for obesity. Anti-inflammatory therapies have been tested in more than a dozen clinical trials to improve insulin sensitivity and glucose homeostasis in patients with T2DM, and the results are not encouraging. One possible explanation is that anti-inflammatory therapies also attenuate the beneficial effects of inflammation in stimulating energy expenditure, which may have limited the efficacy of the treatment by promoting energy accumulation. Thus, the positive effects of proinflammatory events should be considered in evaluating the impact of inflammation in obesity and type 2 diabetes. FAU - Ye, Jianping AU - Ye J AD - Antioxidant and Gene Regulation Laboratory, Pennington Biomedical Research Center, Louisiana State Univ. System, Baton Rouge, LA 70808, USA. yej@pbrc.edu FAU - McGuinness, Owen P AU - McGuinness OP LA - eng GR - R01 DK078188/DK/NIDDK NIH HHS/United States GR - DK-043748/DK/NIDDK NIH HHS/United States GR - DK-020593/DK/NIDDK NIH HHS/United States GR - R01 DK068036/DK/NIDDK NIH HHS/United States GR - DK-085495/DK/NIDDK NIH HHS/United States GR - U24 DK059637/DK/NIDDK NIH HHS/United States GR - DK-068036/DK/NIDDK NIH HHS/United States GR - P60 DK020593/DK/NIDDK NIH HHS/United States GR - R56 DK068036/DK/NIDDK NIH HHS/United States GR - R01 DK085495/DK/NIDDK NIH HHS/United States GR - R56 DK043748/DK/NIDDK NIH HHS/United States GR - DK-078188/DK/NIDDK NIH HHS/United States GR - DK-059637/DK/NIDDK NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20121226 PL - United States TA - Am J Physiol Endocrinol Metab JT - American journal of physiology. Endocrinology and metabolism JID - 100901226 RN - 0 (Anti-Inflammatory Agents) RN - 0 (Blood Glucose) RN - 0 (Cytokines) RN - 0 (Hormones) SB - IM MH - Adipose Tissue/physiopathology MH - Animals MH - Anti-Inflammatory Agents/therapeutic use MH - Blood Glucose/metabolism MH - Cytokines/metabolism MH - Diabetes Mellitus, Type 2/physiopathology MH - Energy Metabolism/physiology MH - Homeostasis/physiology MH - Hormones/metabolism MH - Humans MH - Inflammation/complications/drug therapy/*physiopathology MH - Insulin Resistance MH - Obesity/complications/*physiopathology PMC - PMC3774179 EDAT- 2012/12/28 06:00 MHDA- 2013/04/17 06:00 PMCR- 2014/03/01 CRDT- 2012/12/28 06:00 PHST- 2012/12/28 06:00 [entrez] PHST- 2012/12/28 06:00 [pubmed] PHST- 2013/04/17 06:00 [medline] PHST- 2014/03/01 00:00 [pmc-release] AID - ajpendo.00266.2012 [pii] AID - E-00266-2012 [pii] AID - 10.1152/ajpendo.00266.2012 [doi] PST - ppublish SO - Am J Physiol Endocrinol Metab. 2013 Mar 1;304(5):E466-77. doi: 10.1152/ajpendo.00266.2012. Epub 2012 Dec 26.