@article{10.1172/jci.insight.93367, author = {Eun Ran Kim AND Shengjie Fan AND Dmitry Akhmedov AND Kaiqi Sun AND Hoyong Lim AND William O’Brien AND Yuanzhong Xu AND Leandra R. Mangieri AND Yaming Zhu AND Cheng-Chi Lee AND Yeonseok Chung AND Yang Xia AND Yong Xu AND Feng Li AND Kai Sun AND Rebecca Berdeaux AND Qingchun Tong}, journal = {JCI Insight}, publisher = {The American Society for Clinical Investigation}, title = {Red blood cell β-adrenergic receptors contribute to diet-induced energy expenditure by increasing O2 supply}, year = {2017}, month = {7}, volume = {2}, url = {https://insight.jci.org/articles/view/93367}, abstract = {Diet-induced obesity (DIO) represents the major cause for the current obesity epidemic, but the mechanism underlying DIO is unclear. β-Adrenergic receptors (β-ARs) play a major role in sympathetic nervous system–mediated (SNS-mediated) diet-induced energy expenditure (EE). Rbc express abundant β-ARs; however, a potential role for rbc in DIO remains untested. Here, we demonstrated that high-fat, high-caloric diet (HFD) feeding increased both EE and blood O2 content, and the HFD-induced increases in blood O2 level and in body weight gain were negatively correlated. Deficiency of β-ARs in rbc reduced glycolysis and ATP levels, diminished HFD-induced increases in both blood O2 content and EE, and resulted in DIO. Importantly, specific activation of cAMP signaling in rbc promoted HFD-induced EE and reduced HFD-induced tissue hypoxia independent of obesity. Both HFD and pharmacological activation cAMP signaling in rbc led to increased glycolysis and ATP levels. These results identify a previously unknown role for rbc β-ARs in mediating the SNS action on HFD-induced EE by increasing O2 supply, and they demonstrate that HFD-induced EE is limited by blood O2 availability and can be augenmented by increased O2 supply.}, number = {14}, doi = {10.1172/jci.insight.93367}, url = {https://doi.org/10.1172/jci.insight.93367}, }