Robert J. Snelgrove, PhD, Lisa G

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Presentation transcript:

Alternaria-derived serine protease activity drives IL-33–mediated asthma exacerbations Robert J. Snelgrove, PhD, Lisa G. Gregory, PhD, Teresa Peiró, PhD, Samia Akthar, MSc, Gaynor A. Campbell, PhD, Simone A. Walker, MSc, Clare M. Lloyd, PhD Journal of Allergy and Clinical Immunology Volume 134, Issue 3, Pages 583-592.e6 (September 2014) DOI: 10.1016/j.jaci.2014.02.002 Copyright © 2014 The Authors Terms and Conditions

Fig 1 Acute allergen-induced mediator release. A, IL-33 levels in the BALF of mice treated with HDM, Alternaria (ALT), cat dander (CAT), ragweed (RAG), papain (PAP), or trypsin (TRYP). “B” denotes boiled extract. B, Western blot of IL-33 protein in BALF. C, Immunohistochemistry, demonstrating alveolar epithelial expression of IL-33 (brown stained cells). IL-1β (D) and MMP-9 levels in the BALF (E). F, Serum MCPT-1 levels. Data are presented as mean ± SEM (3 mice per treatment group). *P < .05 compared with PBS-treated mice. Representative photomicrographs are shown. Original magnification ×40. Scale bar = 50 μm. Journal of Allergy and Clinical Immunology 2014 134, 583-592.e6DOI: (10.1016/j.jaci.2014.02.002) Copyright © 2014 The Authors Terms and Conditions

Fig 2 Serine proteases mediate innate mediator release. BALF IL-33 (A and B), IL-1β (C), and serum MCPT-1 (D) levels of mice treated with either HDM or Alternaria (Alt). E, MMP-9 levels in the BALF. F, Western blot of MMP-9 and gelatin zymogram (G) for MMP-9 activity. Data are presented as mean ± SEM (8-10 mice per treatment group). Representative photomicrographs of gel images are shown. *P < .05 compared with PBS-treated mice. †P < .05 compared with Alternaria-treated mice. Journal of Allergy and Clinical Immunology 2014 134, 583-592.e6DOI: (10.1016/j.jaci.2014.02.002) Copyright © 2014 The Authors Terms and Conditions

Fig 3 Cell recruitment to the lungs occurs within 24 hours. Mice were treated with either HDM or Alternaria (Alt). Total cells (A), neutrophils (B), eosinophils (C), tissue macrophages (D), IL-13 (E), and IL-5 (F) levels in the BALF. Data are presented as mean ± SEM (8-10 mice per treatment group). *P < .05 compared with PBS-treated mice. †P < .05 compared with Alternaria-treated mice. Journal of Allergy and Clinical Immunology 2014 134, 583-592.e6DOI: (10.1016/j.jaci.2014.02.002) Copyright © 2014 The Authors Terms and Conditions

Fig 4 Exacerbation of HDM-induced allergic airway disease by Alternaria. Mice were treated with HDM and received a final challenge with Alternaria (Alt). A, Schematic of exacerbation protocol. B, qPCR of MUC5AC transcript. C, Mucous score and periodic acid–Schiff staining of paraffin section, showing mucous (pink staining) (D). E, Baseline elastance and baseline compliance (F). G, Elastance at 100 mg/mL methacholine (MCh). H, Airway resistance to increasing doses of methacholine. Data are presented as mean ± SEM (4-6 mice per treatment group). Representative photomicrographs are shown. Original magnification ×40. Scale bar = 50 μm. *P < .05 compared with PBS-treated mice. †P < .05 compared with HDM-treated mice. Journal of Allergy and Clinical Immunology 2014 134, 583-592.e6DOI: (10.1016/j.jaci.2014.02.002) Copyright © 2014 The Authors Terms and Conditions

Fig 5 Alternaria results in inflammatory cell influx in allergic mice. Mice were treated with HDM and received a final challenge with Alternaria (Alt). Eosinophils (A), tissue macrophages (B), neutrophils (C), Lin− IL-13+ ILC2 cells (D), CD4+ IFN-γ+ TH1 (E), CD4+ IL-17+ TH17 (F), and CD4+ IL-13+ TH2 cells in the BALF (G). H, IL-13 levels in the BALF determined by ELISA. *P < .05 compared with PBS-treated mice. †P < .05 compared with HDM or HDM ALT-treated mice. Data are presented as mean ± SEM (4-6 mice per treatment group). Journal of Allergy and Clinical Immunology 2014 134, 583-592.e6DOI: (10.1016/j.jaci.2014.02.002) Copyright © 2014 The Authors Terms and Conditions

Fig E1 Innate mediator release in the BALF after allergen challenge. Mice were treated with extracts of either HDM, Alternaria (ALT), cat dander (CAT), ragweed (RAG), or the proteases papain (PAP) or trypsin (TRYP). B denotes boiled extract. A, Total cells. B, IL-33 levels in the lung 1 hour after PBS or ALT exposure. C, Lactate dehydrogenase, uric acid (D), albumin levels (E) in the BALF. Data are presented as mean ± SEM (8-10 mice per treatment group). *P < .05 compared with PBS-treated mice. Journal of Allergy and Clinical Immunology 2014 134, 583-592.e6DOI: (10.1016/j.jaci.2014.02.002) Copyright © 2014 The Authors Terms and Conditions

Fig E2 Protease activity of allergen extracts. A, Total protease activity of HDM and Alternaria (ALT). B, Serine/cysteine protease activity determined by metabolism of the serine and cysteine protease substrate N-Benzoyl-Phe-Val-Arg-p-nitroanilide (NBP-VANA). Data are presented as mean ± SEM (n = 4). C, IL-33 levels in the BALF 1 hour after exposure to allergen. Data are presented as mean ± SEM (4-6 mice per treatment group). Journal of Allergy and Clinical Immunology 2014 134, 583-592.e6DOI: (10.1016/j.jaci.2014.02.002) Copyright © 2014 The Authors Terms and Conditions

Fig E3 Alternaria induces mucus release in the exacerbation model. A, Fold increase in transcript for MUC5B determined by qPCR. B, Western blot for mucin 5AC in the BALF of mice exposed to HDM and subsequently treated with either Alternaria in the presence or absence of AEBSF or PBS. Data are 4-6 mice per treatment group. *P < .05 compared with PBS-treated mice. Journal of Allergy and Clinical Immunology 2014 134, 583-592.e6DOI: (10.1016/j.jaci.2014.02.002) Copyright © 2014 The Authors Terms and Conditions