Scavenger Receptor BI Attenuates IL-17A-Dependent Neutrophilic Inflammation in Asthma.

Journal Article (Journal Article)

Asthma is a common respiratory disease currently affecting more than 300 million worldwide and is characterized by airway inflammation, hyperreactivity, and remodeling. It is a heterogeneous disease consisting of corticosteroid-sensitive T-helper cell type 2-driven eosinophilic and corticosteroid-resistant, T-helper cell type 17-driven neutrophilic phenotypes. One pathway recently described to regulate asthma pathogenesis is cholesterol trafficking. Scavenger receptors, in particular SR-BI (scavenger receptor class B type I), are known to direct cellular cholesterol uptake and efflux. We recently defined SR-BI functions in pulmonary host defense; however, the function of SR-BI in asthma pathogenesis is unknown. To elucidate the role of SR-BI in allergic asthma, SR-BI-sufficient (SR-BI+/+) and SR-BI-deficient (SR-BI-/-) mice were sensitized (Days 0 and 7) and then challenged (Days 14, 15, and 16) with a house dust mite (HDM) preparation administered through oropharyngeal aspiration. Airway inflammation and cytokine production were quantified on Day 17. When compared with SR-BI+/+ mice, the HDM-challenged SR-BI-/- mice had increased neutrophils and pulmonary IL-17A production in BAL fluid. This augmented IL-17A production in SR-BI-/- mice originated from a non-T-cell source that included neutrophils and alveolar macrophages. Given that SR-BI regulates adrenal steroid hormone production, we tested whether the changes in SR-BI-/- mice were glucocorticoid dependent. Indeed, SR-BI-/- mice were adrenally insufficient during the HDM challenge, and corticosterone replacement decreased pulmonary neutrophilia and IL-17A production in SR-BI-/- mice. Taken together, these data indicate that SR-BI dampens pulmonary neutrophilic inflammation and IL-17A production in allergic asthma at least in part by maintaining adrenal function.

Full Text

Duke Authors

Cited Authors

  • Reece, SW; Varikuti, S; Kilburg-Basnyat, B; Dunigan-Russell, K; Hodge, MX; Luo, B; Madenspacher, JH; Thomas, SY; Tokarz, DA; Tighe, RM; Cook, DN; Fessler, MB; Gowdy, KM

Published Date

  • June 2021

Published In

Volume / Issue

  • 64 / 6

Start / End Page

  • 698 - 708

PubMed ID

  • 33647226

Pubmed Central ID

  • PMC8456883

Electronic International Standard Serial Number (EISSN)

  • 1535-4989

Digital Object Identifier (DOI)

  • 10.1165/rcmb.2020-0007OC

Language

  • eng

Conference Location

  • United States