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This galley proof is being listed electronically before publishing the final manuscript (It's not final version).

 
Leukotriene B4 receptors contribute to house dust mite-induced eosinophilic airway inflammation via TH2 cytokine production
Donghwan Park1,# (College student), Dong-Wook Kwak1,# (College student), Jae Hong Kim 1,* (Professor)
1Department of Biotechnology, College of Life Sciences, Korea University
Abstract
Leukotriene B4 (LTB4) is a lipid mediator of inflammation that is generated from arachidonic acid via the 5-lipoxygenase pathway. Previous studies have reported that the receptors of LTB4, BLT1 and BLT2 play mediatory roles in the allergic airway inflammation induced by ovalbumin (OVA). However, considering that house dust mites (HDMs) are the most prevalent allergen and well-known risk factor for asthmatic allergies, we are interested in elucidating the contributory roles of BLT1/2 in HDM-induced allergic airway inflammation. The aim of this study was to investigate whether BLT1/2 play any roles in HDM-induced allergic airway inflammation. In the present study, we observed that the levels of ligands for BLT1/2 [LTB4 and 12(S)-HETE (12(S)-hydroxyeicosatetraenoic acid)] were significantly increased in bronchoalveolar lavage fluid (BALF) after HDM challenge. Blockade of BLT1 or BLT2 as well as 5-lipoxygenase (5-LO) or 12-lipoxygenase (12-LO) markedly suppressed the production of TH2 cytokines (IL-4, IL-5 and IL-13) and alleviated lung inflammation and mucus secretion in an HDM-induced eosinophilic airway inflammation mouse model. Together, these results indicate that the 5-/12-LO-BLT1/2 cascade plays a role in HDM-induced airway inflammation by mediating the production of TH2 cytokines. Our findings suggest that BLT1/2 may be a potential therapeutic target for patients with HDM-induced allergic asthma.
Abstract, Accepted Manuscript(in press) [Submitted on November 6, 2020, Accepted on January 28, 2021]
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