Gene-Environment Interaction in Allergic Asthma
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1 Gene-Environment Interaction in Allergic Asthma Renz, von Mutius, et al. Nature Immunology 211;12: Renz H, Autenrieth IB, Brandtzeag P, Cookson WO, Holgate S, von Mutius E, et al. JACI 211;128(6):25-49.
2 Pre- and postnatal environment opportunity for early immuno-education and programming
3 Loss of clinical and immunological tolerance Hygiene hypothesis Lack of infectious microbes in early childhood Altered exposure to environmental microbes Examples: having older siblings frequent viral infections anthroposophical life style early day care traditional farming
4 Traditional farming and early immuno-education Courtesy: Erika von Mutius ALEX-Study ( ) EU-6FWP PASTURE (22 27) EU-7FWP PRO-IMMUNE (28 211)
5 Traditional farming environment and atopic/allergic phenotypes - studies worldwide - n=5 n=3 n=4 n=1 n=1 n= n=1 6 4 n=6 n=6 n=2 n=6 n=4 n=1 n=4 n = 33 studies
6 Effect of childhood farm exposure on allergic phenotypes Protective effect Phenotype Number of studies Risk reduction Significant Trend (n =) (n =) % (n =) % rhinitis/ conjunctivitis 16 (12) 75 % (4) 25 % atopic sensitization 14 (1) 71 % (4) 29 % asthma 28 (18) 64 % (1) 36 % wheezing 17 (9) 53 % (7) 41 % * atopic dermatitis 14 (3) 21 % (1) 72 % Total study number : n = 33 * In one study a slight increase in risk was observed von Mutius and Vercelli, 21; Roduit et al., 21
7 Adj. Prevalence of Hay Fever (%) Adj. Prevalence of Hay Fever Symptomes (%) Adj. Prevalence of Atopic Sensitization (%) Inverse relationship between endotoxin-load and atopic phenotypes Adj. Prevalence of Hay Fever (%) Adj. Prevalence of Hay Fever Symptoms (%) Adj. Prevalence of Atopic Sensitization (%) Endotoxin Load in Mattress [EU/m 2 ] Endotoxin Load in Mattress [EU/m 2 ] Endotoxin Load in Mattress [EU/m 2 ] Endotoxin Load in Mattress [EU/m 2 ] Endotoxin Load in Mattress [EU/m 2 ] Endotoxin Load in Mattress [EU/m 2 ] Braun-Fahrländer et al. NEJM, 22
8 CD14 mrna / 18s rrna TLR2 mrna / 18s rrna TLR4 mrna / 18s rrna Farmers express higher levels of CD14 and TLR-2, but not TLR-4 CD14 TLR-2 TLR p <.5.21 p <.1.55 ns non farmer farmer. non farmer farmer.2 non farmer farmer Lauener et al, Lancet 22
9 IFN [pg/1 6 lymphocytes] IL-1 [pg/1 IL-1 [pg/1 6 lymphocytes] ] Inverse relationship between in-vitro IFN- and IL-1 production and in-door endotoxin load IFN IL-1 1 IFN [pg/1 6 lymphocytes] Endotoxin Load in Mattress [EU/m 1 2 ] Endotoxin Load in Mattress [EU/m 2 ] Endotoxin Load in Mattress [EU/m²] stimulation of PBMC with 1 µg/ml LPS collection of supernatants after 24 h Braun-Fahrländer et al. NEJM, 22
10 TNFα [pg/1 6 lymphocytes] 6 lymphocytes] IL-12 [pg/1 6 lymphocytes] Braun-Fahrländer et al. NEJM, 22 Inverse relationship between in-vitro TNF-a and IL-12 production and in-door endotoxin load TNF a [pg/ TNFα IL-12 [pg/1 6 lymphocytes] IL Endotoxin Load in Mattress [EU/m 2 ] Endotoxin Load in Mattress [EU/m 1 2 ] Endotoxin Load in Mattress [EU/m²]
11 Selection of study population RS SRS = random selection = stratified random selection Ege MJ et al. Allergy 212;67:
12 Examples of bacterial species inversly related to childhood asthma and atopy Health outcome Physician s diagnosis of asthma Bacterium Corynebacterium sp Jeotgalicoccus sp Gardnerella vaginalis Lactobacillus curvatus, saker Atopic sensitization Staphylococcus sciuri Lactobacillus iners Acinetobacter lwoffii modified from Ege MJ et al. Allergy 212;67:
13
14 Mouse model of prenatal immuno-modulation - proof of principle - Mother A. lwoffii F78 exposure Mating Pregnancy Birth days -1 2 sensitization aerosol challenge Offspring days Phenotype
15 Prenatal A. lwoffii F78 exposure prevents the allergic phenotype Goblet cells Eosinophils Airway reactivity Conrad et al, J Exp Med, 29
16
17 Toll-like receptors and their ligands Peptidoglycan (G+) Lipoprotein Zymosan (Yeast) dsrna LPS (G-) Flagellin MALP-2 ssrna R848 CpG DNA??? CD14 MD-2
18 Intact maternal TLR-signalling is required for allergy protection Conrad et al, J Exp Med, 29
19 Intranasal A. lwoffii administration suppressed placental cytokine production X. Conrad et al, JEM 29
20 Commensal bacteria promote development of respiratory mucosal immune system Renz et al. Nat Rev Immunol 211 Dec 9;12(1):9-23.
21
22 MCh5 (mg/ml) pg/ml inflammation score V mucin/sbm (µm 3 /µm 2 ) % of goblet cells per basal membrane length (µm/µm) Asthma protection by prenatal A. lwoffii exposure is IFN dependent B Prenatal exposure Inflammation *** * A.lwoffii A.lwoffii A.lwoffii 7 6 Mucin 8 * A.lwoffii A.lwoffii A.lwoffii * Goblet cells 55 *** * A.lwoffii A.lwoffii A.lwoffii Sensitization Challenge Antibody treatment IgG a IFN IgG a IFN IgG a IFN C Airway reactivity 1 ** * Prenatal exposure A.lwoffii A.lwoffii A.lwoffii D IL-5 * * A.lwoffii A.lwoffii A.lwoffii Sensitization Challenge Antibody treatment IgG a IFN IgG a IFN Brand et al., JACI 211
23 % Methylation % Methylation % Methylation % Methylation % Methylation % Prenatal A. lwoffii exposure has no significant effect on DNA methylation of cytokine promotors / 1 9 IL-4 promoter IL-4 promoter 1 9 IL-5 promoter IL-5 promoter / 8 8 A. lwoffi/ A. lwoffi/ / / ACI/ ACI/ IFN promoter IFN- promoter CNS-1 1 ** 9 * ** CNS % Methylation % Methylation Brand et al, 211 JACI 28(3)
24 Epigenetic regulation - Histone modifications Transcription no Transcription TF Open chromatin: active state closed chromatin: inactive state H3 Ac Ac K79 K27 K23 Ac Me Me K18 Me R17 K14 Ac K9 Ac Me Me K4 Ac H4 K2 Me Ac K16 Ac K8 R3 Me Histone modifications: Acetylation Methylation Phosphorylation Ubiquination Sumoylation
25 % Input % Methylation Epigenetic regulation of the IFN promotor by prenatal A. lwoffii exposure DNA methylation / / Aci/ Aci/ / / A. lwoffi/ A. lwoffi/ 25 ** 2 Histone acetylation 15 1 ** 5 ns IgG H4ac H3K27me3 Brand et al, 211 JACI 28(3)
26 % Input % Input % Input % Input Epigenetic regulation of cytokine promotors by prenatal A. lwoffii exposure / / IFN promoter IL-4 promoter A. lwoffi/ ** ** / / A.lwoffii/ lwoffi/ A.lwoffii/ lwoffi/ ** A. lwoffi/ ns 5 ns H4ac H3K27me3 H4ac H3K27me3 IL-5 promoter CNS ns 1 ns 5 ns 5 ns H4ac H3K27me3 H4ac H3K27me3
27 Histone Acetyltransferase Inhibitor Garcinol Histone Acetyltransferase p3 Potent inhibitor of HAT p3 (IC 5 = 7µM) and PCAF (IC 5 = 5µM) Histone-Binding-Site Acetyl-CoA-Binding-Site Inhibits histone acetylation, no effect on deacetylation of histones Acetylation of H4 >> H3 Garcinol Arif et al., J.Med.Chem., 29 Balasubramanyam et al., JBC, 24
28 MHC5 pg/ml inflammation score % of goblet cells per basal membrane length (µm/µm) Garcinol inhibits histone acetylation and abolishes A. lwoffii mediated asthma protection in the progeny B Prenatal exposure Inflammation ** * A.lwoffii A.lwoffii A.lwoffii Goblet cells * ** A.lwoffii A.lwoffii A.lwoffii Sensitization Challenge Treatment Gar Gar C AHR AHR 9 *** ** Prenatal exposure A.lwoffii A.lwoffii A.lwoffii D Prenatal exposure IFN *** ** A.lwoffii A.lwoffii A.lwoffii Sensitization Sensitization Challenge Challenge Treatment Gar Treatment Gar Brand et al, JACI 212
29 The Team PASTURE study team Erika von Mutius, Munich, D Charlotte Braun-Fahrländer, Basel, CH Roger Lauener, Zürich, CH Josef Riedler, Salzburg, A Juha Pekannen, Kuopio, Fi Jean-Charles Dalphin, Besancon, F Dept of Clinical Chemistry and Molecular Diagnostics, Marburg Holger Garn Petra Ina Pfefferle Stefanie Brandt Dörthe Kesper Christoph Hudemann Ayse Kilic Ulrich Purath SFB/TR22 study team Otto Holst, Borstel Kai Vogel, Borstel Johann Bauer, Munich Melanie Korthals, Munich
Gene-Environment Interaction in Chronic Inflammatory Disease
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