A critical role for IL-18 in transformation and maturation of naive eosinophils to pathogenic eosinophils Sathisha Upparahalli Venkateshaiah, PhD, Akanksha.

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Presentation transcript:

A critical role for IL-18 in transformation and maturation of naive eosinophils to pathogenic eosinophils Sathisha Upparahalli Venkateshaiah, PhD, Akanksha Mishra, BS, MA, Murli Manohar, PhD, Alok K. Verma, PhD, Priya Rajavelu, PhD, Rituraj Niranjan, PhD, Laurianne G. Wild, MD, Nereida A. Parada, MD, Uwe Blecker, MD, Joseph A. Lasky, MD, Anil Mishra, PhD Journal of Allergy and Clinical Immunology Volume 142, Issue 1, Pages 301-305 (July 2018) DOI: 10.1016/j.jaci.2018.02.011 Copyright © 2018 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 1 Human blood and tissue CD101 and CD274 expression on eosinophils in healthy subjects and allergic patients. A-D, Representative flow cytometric analysis was performed by selecting live CCR3+ and anti–Siglec-8 double-positive eosinophils for identifying CD101- and CD274-expressing eosinophils in the blood of healthy subjects, asthmatic patients, and patients with EoE. E and F, Analysis shows that all blood CD101-expressing eosinophils do not express CD274. G and H, Percentages and absolute numbers of both CD101- and CD274-expressing CCR3+Siglec-8+ eosinophils in the blood of patients with EoE and asthmatic patients compared with healthy subjects are shown in Fig 1, G and H, respectively. I-N, Nasal lavage fluid from asthmatic patients (Fig 1, I-K) and esophageal biopsy specimens from patients with EoE (Fig 1, L-N) showed only double-positive CD101+CD274+ eosinophils. All data presented are expressed as means ± SDs (healthy subjects, n = 10; asthmatic patients, n = 14; patients with EoE, n = 16). NS, Not significant. Journal of Allergy and Clinical Immunology 2018 142, 301-305DOI: (10.1016/j.jaci.2018.02.011) Copyright © 2018 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 2 IL-18 is critical for the development of CD101 and CD274 eosinophil subsets. A-F, A representative flow cytometric analysis of eosinophil surface expression on 7-aminoactinomycin D (7AAD)−/CCR3+ leukocytes selected for detection of CD101 and CD274 on anti-CCR3 and anti–Siglec-F double-positive eosinophils of CD2–IL-5 transgenic mouse splenocytes and blood based on CD101 and CD274 isotype-matched anti-IgG. G-J, Very few (>2%) CD101-expressing (Fig 2, G and H) and CD274-expresing (Fig 2, I and J) eosinophils (CCR3+Siglec-F+) were detected in the blood. K-R, CD2–IL-5 transgenic mouse splenocytes exposed to IL-18 ex vivo showed a time-dependent kinetic increase in expression of CD101 on CCR3+Siglec-F+ eosinophils (Fig 2, K-N) and CD274 on CCR3+Siglec-F+ eosinophils (Fig 2, O-R). Data are expressed as means ± SDs (n = 3 individual experiments). Journal of Allergy and Clinical Immunology 2018 142, 301-305DOI: (10.1016/j.jaci.2018.02.011) Copyright © 2018 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 3 Confocal, electron microscopic, flow cytometric, and microarray analyses of eosinophils derived from LDEBM precursors in response to rIL-5 and rIL-18. A, Representative confocal photomicrographs of anti-MBP and anti-IgG–fluorescein isothiocyanate (FITC; green)–stained and 4′-6-diamidino-2-phenylindole dihydrochloride–stained (blue) rIL-5 and rIL-18 differentiated eosinophils. B and C, Total computerized quantitative area of the compartmentalized nucleus and cytoplasm and their ratio analyzed by using IMARIS software presented (mean ± SD, n = 30) from rIL-5– and rIL-18–differentiated eosinophils (Fig 3, B and C). D, Electron photomicrographs of rIL-5–differentiated eosinophils (original magnification ×24,000) and rIL-18–differentiated eosinophils (original magnification ×1,800, n = 15 eosinophils analyzed). E, Representative flow cytometric analysis (n = 5) of eosinophil granularity and size analysis on side-scatter (SSC) and forward-scatter (FSC) plots for rIL-5–and rIL-18–treated eosinophils. F, Microarray analysis of CD34+ LDEBM precursors treated with FLT3L for 4 days (control), rIL-5–derived eosinophils, and rIL-18–differentiated eosinophils purified by means of fluorescence-activated cell sorting. Overexpressed genes are presented in red, and downregulated genes are presented in blue. Each column represents combined experimental data sets analyzed by using multiple independently generated eosinophil RNAs, and a gene list of genes with a greater than 10-fold change in response to IL-18 and IL-5 are presented. G and H, Highly expressed CD274 (PDL1) mRNA relative expression along with CD101 was also examined by using real-time PCR. I, Comparative real-time PCR analysis data of the transcript levels (fold change) in IL-5– and IL-18–generated eosinophil granules (MBP, EPO, eosinophil cationic protein [ECP], and eosinophil-derived neurotoxin [EDN]) are presented and demonstrate more granular content in IL-18–differentiated eosinophils compared with IL-5–generated eosinophils, except EPO. Arrows demonstrate eosinophil granules in the eosinophils. Data are expressed as means ± SDs (n = 3). *P < .04, **P < .01, ***P < .0001, and ****P < .00001. NS, Not significant. Journal of Allergy and Clinical Immunology 2018 142, 301-305DOI: (10.1016/j.jaci.2018.02.011) Copyright © 2018 American Academy of Allergy, Asthma & Immunology Terms and Conditions