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Wan T, Yuan G, Ren Y, Zuo Z, Wang Z, Jia Y, Cui H, Peng X, Fang J, Deng J, Yu S, Hu Y, Shen L, Ma X, Wang Y, Ren Z. Diet-induced obese mice exhibit altered immune responses to acute lung injury induced by Escherichia coli. Obesity (Silver Spring) 2016; 24:2101-10. [PMID: 27558300 PMCID: PMC5095879 DOI: 10.1002/oby.21608] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 05/06/2016] [Accepted: 05/11/2016] [Indexed: 11/05/2022]
Abstract
OBJECTIVE Obesity has been associated with impaired immunity and increased susceptibility to bacterial infection. It also exerts protective effects against mortality secondary to acute lung injury. The effects of obesity on immune responses to acute lung injury induced by Escherichia coli were investigated to determine if the above-mentioned differences in its effects were related to infection severity. METHODS Diet-induced obesity (DIO) and lean control mice received intranasal instillations of 10(9) or 10(10) CFUs of E. coli. The immune responses were examined at 0 h (uninfected), 24 h, and 96 h postinfection. RESULTS Following infection, the DIO mice exhibited higher leukocyte, interleukin (IL)-10, IL-6, and tumor necrosis factor-α levels and more severe lung injury than the lean mice. Following inoculation with 10(10) CFUs of E. coli, the DIO mice exhibited higher mortality and more severe inflammation-induced injury than the lean mice, but no differences in E. coli counts were noted between the two groups. However, inoculated with 10(9) CFUs of E. coli, the DIO mice exhibited smaller E. coli burdens at 24 h and 96 h after infection, as well as lower concentrations of IL-10 and tumor necrosis factor-α and less severe lung injury at 96 h after infection. CONCLUSIONS The results support the emerging view that obesity may be beneficial in the setting of milder infection but detrimental in the setting of more severe infection.
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Affiliation(s)
- Taomei Wan
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Guiqiang Yuan
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Yi Ren
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Zhicai Zuo
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China..
| | - Zhengyi Wang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Yiping Jia
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Hengmin Cui
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Xi Peng
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Jing Fang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Junliang Deng
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Shumin Yu
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Yanchun Hu
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Liuhong Shen
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Xiaoping Ma
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Ya Wang
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
| | - Zhihua Ren
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Sichuan Province, Wenjiang, China
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Abstract
Human phagocytic cells are of crucial importance in the early responses to infection. However, tests of their function have been somewhat neglected in immunological screening. This paper summarises briefly our techniques for studying neutrophils and monocytes in skin abrasions and a simple assay of phagocytic and bactericidal function. These techniques use small volumes of blood and are suitable for inclusion in the early screening of individuals who have repeated bacterial infections.
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