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Chang YW, Hung LC, Chen YC, Wang WH, Lin CY, Tzeng HH, Suen JL, Chen YH. Insulin Reduces Inflammation by Regulating the Activation of the NLRP3 Inflammasome. Front Immunol 2021; 11:587229. [PMID: 33679687 PMCID: PMC7933514 DOI: 10.3389/fimmu.2020.587229] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 12/24/2020] [Indexed: 12/18/2022] Open
Abstract
The NOD-, LRR-, and pyrin domain-containing protein 3 (NLRP3) inflammasome is the platform for IL-1β maturation, aimed at mediating a rapid immune response against danger signals which must be tightly regulated. Insulin is well known as the critical hormone in the maintenance of glucose in physiologic response. Previous studies have proved insulin has the anti-inflammatory effect but the molecular mechanism of immunomodulation provided by insulin is not clear so far. Here we investigated whether insulin reduces inflammation by regulating the NLRP3 inflammasome. In the present study, we used LPS and ATP to induce the intracellular formation of the NLRP3 inflammasome. Insulin inhibited the secretion of IL-1β by preventing the assembly of the ASC in THP-1 cells and human CD14+ monocyte-derived macrophages. The phosphorylation status of Syk, p38 mitogen−activated protein kinase (MAPK) and ASC were altered by insulin. These effects were attenuated in THP-1 cells transfected with small interfering RNA targeting insulin receptors. In vivo, administration of glucose–insulin–potassium reduced serum IL-1β level, intestinal ASC speck formation, local macrophage infiltration and alleviated intestinal injury in mice exposed to LPS. Insulin may play an immunomodulatory role in anti-inflammation by regulating the NLRP3 inflammasome.
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Affiliation(s)
- Yu-Wei Chang
- College of Medicine, Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Laboratory, Taitung Hospital, Ministry of Health and Welfare, Taitung, Taiwan
| | - Ling-Chien Hung
- Division of Infectious Disease, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,School of Medicine, Graduate Institute of Medicine, Sepsis Research Center, Research Center of Tropical Medicine and Infectious Disease, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yu-Cheng Chen
- Division of Infectious Disease, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,School of Medicine, Graduate Institute of Medicine, Sepsis Research Center, Research Center of Tropical Medicine and Infectious Disease, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Wen-Hung Wang
- Division of Infectious Disease, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,School of Medicine, Graduate Institute of Medicine, Sepsis Research Center, Research Center of Tropical Medicine and Infectious Disease, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chun-Yu Lin
- College of Medicine, Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Division of Infectious Disease, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,School of Medicine, Graduate Institute of Medicine, Sepsis Research Center, Research Center of Tropical Medicine and Infectious Disease, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Hsin-Han Tzeng
- College of Medicine, Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Jau-Ling Suen
- College of Medicine, Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Research Center of Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Yen-Hsu Chen
- Division of Infectious Disease, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,School of Medicine, Graduate Institute of Medicine, Sepsis Research Center, Research Center of Tropical Medicine and Infectious Disease, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Biological Science and Technology, College of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan.,Institute of Medical Science and Technology, National Sun-Yet University, Kaohsiung, Taiwan
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