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Mishra A, Yao X, Saxena A, Gordon EM, Kaler M, Cuento RA, Barochia AV, Dagur PK, McCoy JP, Keeran KJ, Jeffries KR, Qu X, Yu ZX, Levine SJ. Low-density lipoprotein receptor-related protein 1 attenuates house dust mite-induced eosinophilic airway inflammation by suppressing dendritic cell-mediated adaptive immune responses. J Allergy Clin Immunol 2017; 142:1066-1079.e6. [PMID: 29274414 DOI: 10.1016/j.jaci.2017.10.044] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 09/20/2017] [Accepted: 10/19/2017] [Indexed: 01/08/2023]
Abstract
BACKGROUND Low-density lipoprotein receptor-related protein 1 (LRP-1) is a scavenger receptor that regulates adaptive immunity and inflammation. LRP-1 is not known to modulate the pathogenesis of allergic asthma. OBJECTIVE We sought to assess whether LRP-1 expression by dendritic cells (DCs) modulates adaptive immune responses in patients with house dust mite (HDM)-induced airways disease. METHODS LRP-1 expression on peripheral blood DCs was quantified by using flow cytometry. The role of LRP-1 in modulating HDM-induced airways disease was assessed in mice with deletion of LRP-1 in CD11c+ cells (Lrp1fl/fl; CD11c-Cre) and by adoptive transfer of HDM-pulsed CD11b+ DCs from Lrp1fl/fl; CD11c-Cre mice to wild-type (WT) mice. RESULTS Human peripheral blood myeloid DC subsets from patients with eosinophilic asthma have lower LRP-1 expression than cells from healthy nonasthmatic subjects. Similarly, LRP-1 expression by CD11b+ lung DCs was significantly reduced in HDM-challenged WT mice. HDM-challenged Lrp1fl/fl; CD11c-Cre mice have a phenotype of increased eosinophilic airway inflammation, allergic sensitization, TH2 cytokine production, and mucous cell metaplasia. The adoptive transfer of HDM-pulsed LRP-1-deficient CD11b+ DCs into WT mice generated a similar phenotype of enhanced eosinophilic inflammation and allergic sensitization. Furthermore, CD11b+ DCs in the lungs of Lrp1fl/fl; CD11c-Cre mice have an increased ability to take up HDM antigen, whereas bone marrow-derived DCs display enhanced antigen presentation capabilities. CONCLUSION This identifies a novel role for LRP-1 as a negative regulator of DC-mediated adaptive immune responses in the setting of HDM-induced eosinophilic airway inflammation. Furthermore, the reduced LRP-1 expression by circulating myeloid DCs in patients with eosinophilic asthma suggests a possible role for LRP-1 in modulating type 2-high asthma.
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Affiliation(s)
- Amarjit Mishra
- Laboratory of Asthma and Lung Inflammation, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Xianglan Yao
- Laboratory of Asthma and Lung Inflammation, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Ankit Saxena
- Flow Cytometry Core Facility, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Elizabeth M Gordon
- Laboratory of Asthma and Lung Inflammation, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Maryann Kaler
- Laboratory of Asthma and Lung Inflammation, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Rosemarie A Cuento
- Laboratory of Asthma and Lung Inflammation, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Amisha V Barochia
- Laboratory of Asthma and Lung Inflammation, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Pradeep K Dagur
- Flow Cytometry Core Facility, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - J Philip McCoy
- Flow Cytometry Core Facility, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Karen J Keeran
- Animal Surgery and Resources Core Facility, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Kenneth R Jeffries
- Animal Surgery and Resources Core Facility, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Xuan Qu
- Pathology Core Facility, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Zu-Xi Yu
- Pathology Core Facility, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Stewart J Levine
- Laboratory of Asthma and Lung Inflammation, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md.
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