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http://dx.doi.org/10.14348/molcells.2021.0159

Contributory Role of BLT2 in the Production of Proinflammatory Cytokines in Cecal Ligation and Puncture-Induced Sepsis  

Park, Donghwan (Department of Biotechnology, College of Life Sciences, Korea University)
Ro, MyungJa (Department of Biotechnology, College of Life Sciences, Korea University)
Lee, A-Jin (Department of Biotechnology, College of Life Sciences, Korea University)
Kwak, Dong-Wook (Department of Biotechnology, College of Life Sciences, Korea University)
Chung, Yunro (College of Health Solutions, Arizona State University)
Kim, Jae-Hong (Division of Life Sciences, College of Life Sciences, Korea University)
Publication Information
Molecules and Cells / v.44, no.12, 2021 , pp. 893-899 More about this Journal
Abstract
BLT2 is a low-affinity receptor for leukotriene B4, a potent lipid mediator of inflammation generated from arachidonic acid via the 5-lipoxygenase pathway. The aim of this study was to investigate whether BLT2 plays any role in sepsis, a systemic inflammatory response syndrome caused by infection. A murine model of cecal ligation and puncture (CLP)-induced sepsis was used to evaluate the role of BLT2 in septic inflammation. In the present study, we observed that the levels of ligands for BLT2 (LTB4 [leukotriene B4] and 12(S)-HETE [12(S)-hydroxyeicosatetraenoic acid]) were significantly increased in the peritoneal lavage fluid and serum from mice with CLP-induced sepsis. We also observed that the levels of BLT2 as well as 5-lipoxygenase (5-LO) and 12-LO, which are synthesizing enzymes for LTB4 and 12(S)-HETE, were significantly increased in lung and liver tissues in the CLP mouse model. Blockade of BLT2 markedly suppressed the production of sepsis-associated cytokines (IL-6 [interleukin-6], TNF-α [tumor necrosis factor alpha], and IL-1β [interleukin-β] as well as IL-17 [interleukin-17]) and alleviated lung inflammation in the CLP group. Taken together, our results suggest that BLT2 cascade contributes to lung inflammation in CLP-induced sepsis by mediating the production of inflammatory cytokines. These findings suggest that BLT2 may be a potential therapeutic target for sepsis patients.
Keywords
BLT2; cecal ligation and puncture; cytokines; leukotrienes; sepsis;
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