内分泌学
内科学
脂肪组织
脂解
生物
脂肪组织巨噬细胞
胰岛素抵抗
白色脂肪组织
脂肪细胞
免疫系统
先天免疫系统
产热
炎症
细胞生物学
胰岛素
免疫学
医学
作者
Liping Zeng,D. Scott Herdman,Sung Min Lee,Ailin Tao,Manasi Das,Samuel Bertin,Lars Eckmann,Sushil K. Mahata,Panyisha Wu,Miki Hara,Jun Soo Byun,Shwetha Devulapalli,Hemal H. Patel,Anthony Molina,Olivia Osborn,Maripat Corr,Eyal Raz,Nicholas J. G. Webster
出处
期刊:Diabetes
[American Diabetes Association]
日期:2023-05-31
卷期号:72 (9): 1235-1250
被引量:2
摘要
In obesity, CD11c+ innate immune cells are recruited to adipose tissue and create an inflammatory state that causes both insulin and catecholamine resistance. We found that ablation of Gnas, the gene that encodes Gαs, in CD11c expressing cells protects mice from obesity, glucose intolerance, and insulin resistance. Transplantation studies showed that the lean phenotype was conferred by bone marrow–derived cells and did not require adaptive immunity. Loss of cAMP signaling was associated with increased adipose tissue norepinephrine and cAMP signaling, and prevention of catecholamine resistance. The adipose tissue had reduced expression of catecholamine transport and degradation enzymes, suggesting that the elevated norepinephrine resulted from decreased catabolism. Collectively, our results identified an important role for cAMP signaling in CD11c+ innate immune cells in whole-body metabolism by controlling norepinephrine levels in white adipose tissue, modulating catecholamine-induced lipolysis and increasing thermogenesis, which, together, created a lean phenotype. Article Highlights We undertook this study to understand how immune cells communicate with adipocytes, specifically, whether cAMP signaling in the immune cell and the adipocyte are connected. We identified a reciprocal interaction between CD11c+ innate immune cells and adipocytes in which high cAMP signaling in the immune cell compartment induces low cAMP signaling in adipocytes and vice versa. This interaction regulates lipolysis in adipocytes and inflammation in immune cells, resulting in either a lean, obesity-resistant, and insulin-sensitive phenotype, or an obese, insulin-resistant phenotype.
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