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Distinct TLR-mediated pathways regulate house dust mite–induced allergic disease in the upper and lower airways

 Ji-Hwan Ryu  ;  Jung-Yeon Yoo  ;  Min-Ji Kim  ;  Sang-Gyu Hwang  ;  Kwang Chul Ahn  ;  Jae-Chan Ryu  ;  Mi-Kyung Choi  ;  Jung Hee Joo  ;  Chang-Hoon Kim  ;  Sang-Nam Lee  ;  Won-Jae Lee  ;  Jaesang Kim  ;  Dong Min Shin  ;  Mi-Na Kweon  ;  Yun Soo Bae  ;  Joo-Heon Yoon 
 Journal of Allergy and Clinical Immunology, Vol.131(2) : 549-561, 2013 
Journal Title
 Journal of Allergy and Clinical Immunology 
Issue Date
BACKGROUND: Allergic rhinitis (AR) and asthma are 2 entities of allergic airway diseases that frequently occur together, which is referred to as united airways. In contrast to this general concept, we hypothesized that innate immunity of the upper and lower airways is respectively distinctive, because the immunologic conditions of the nasal and lung mucosa as well as the functions of the immune cells within their epithelia are different. OBJECTIVE: We wanted to identify distinctive mechanisms of innate immunity in the nose and lung mucosa, which are responsible for house dust mite (HDM)-induced AR and allergic asthma (AA), respectively. METHODS: We constructed a mouse model of AR or AA induced by sensitization and consequent provocation with HDM extracts. RESULTS: HDM-derived β-glucans, rather than LPS, were proven to be essential to activating innate immunity in the nasal mucosa and triggering AR, which depended on Toll-like receptor 2 (TLR2), but not on TLR4; however, the LPS/TLR4 signaling axis, rather than β-glucans/TLR2, was critical to HDM-induced AA. These differences were attributed to the specific role of β-glucans and LPS in inducing the surface expression of TLR2 and TLR4 and their translocation to lipid rafts in nasal and bronchial epithelial cells, respectively. We also showed that dual oxidase 2-generated reactive oxygen species mediate both β-glucan-induced TLR2 activation and LPS-induced TLR4 activation. CONCLUSIONS: We describe a novel finding of distinctive innate immunity of the nose and lungs, respectively, which trigger AR and AA, by showing the critical role of HDM-induced TLR activation via dual oxidase 2-mediated reactive oxygen species.
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2. College of Dentistry (치과대학) > Dept. of Oral Biology (구강생물학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Otorhinolaryngology (이비인후과학교실) > 1. Journal Papers
5. Research Institutes (연구소) > Research Center for Human Natural Defense System (생체방어연구센터) > 1. Journal Papers
Yonsei Authors
Kim, Chang Hoon(김창훈) ORCID logo https://orcid.org/0000-0003-1238-6396
Shin, Dong Min(신동민) ORCID logo https://orcid.org/0000-0001-6042-0435
Ryu, Ji Hwan(유지환)
Yoon, Joo Heon(윤주헌)
Lee, Sang Nam(이상남)
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