Allergen Immunotherapy in Asthma: Now and in the Future
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1 Allergen Immunotherapy in Asthma: Now and in the Future Young-Il Koh, M.D. Chonnam National University Medical School, Gwangju, Korea CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 1
2 Management of asthma Allergic Nonallergic Avoidance Ⅹ Pharmacotherapy Allergen immunotherapy (AIT) Ⅹ CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 2
3 A case of SCIT in allergic asthma Patient: 24 yrs, Male Diagnosis: HDM-allergic asthma with rhinitis Vaccine: Der p 50% + Der f 50% (Novo-Helisen Depot) Build-up: Conventional schedule Maintenance: 4-week intervals CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 3
4 100 FEV 1 (% pred.) Fluticasone 50 g/day No medications for asthma and rhinitis 9-Apr-13 7-May-13 6-Aug Jun Aug-14 4-Mar Mar CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 4
5 Specific IgG 4 (mg/l) Apr-13 4-May-16 Der p Der f CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 5
6 Specific IgE (ku/l) Apr Jun May-16 Der p Der f CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 6
7 SPT wheal size (A/H ratio, %) Nov-10 8-Jul-14 5-Jul-16 Der p Der f CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 7
8 Current AIT Severity: Mild-to-moderate asthma Allergen: HDM, animal, pollen, Alternaria (Allergy 2015;70:897) Route: SCIT and SLIT Duration: at least 3 5 yrs CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 8
9 Advantages of AIT Long-lasting effect after discontinuation Effect of pharmacotherapy is transient Prevention of new allergen sensitization CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 9
10 Long-lasting effect Methacholine AHR improvement has been maintained at least 6 8 years after discontinuation in 3 SLIT groups compared to controls JACI 2010;126: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 10
11 Prevention of new sensitization At least 1 new skin sensitization was reduced in 3 SLIT groups compared to controls JACI 2010;126: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 11
12 Extended indication for AIT in asthma Well controlled asthma (regardless of severity) is not a contraindication Uncontrolled asthma is an absolute contraindication Partly controlled asthma is a relative contraindication Allergy 2015;70:897 position paper CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 12
13 Role of AIT for stepping down medication Asthma medication: stepwise approach Non-pharmacological strategies to step down medication: add-on- AIT Demoly et al. JACI Pract CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 13
14 SCIT to reduce ICS dose 54 HDM-allergic adult asthmatics SCIT 3 yrs Placebo SCIT Allergy 2006;61: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 14
15 AQLQ score SLIT to reduce ICS dose 604 HDM-allergic ICS dose/day adult asthmatics ACQ score CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL Resp Med 2014;108:
16 SLIT to reduce asthma exacerbation JAMA 2016;315: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 16
17 Role of AIT for asthma control in GINA In step 3 and 4, add-on-slit can be considered in HDM-allergic adult asthmatics with exacerbations despite ICS treatment, provided FEV 1 is > 70% pred. GINA CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 17
18 Induction of Treg and Breg cell during AIT World Allergy Organ J 2015;8:17 JCI 2014;124: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 18
19 Limitations of AIT Effect: not so big Safety: anaphylaxis Treatment duration: long Uncontrolled asthma: contraindication CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 19
20 New approaches to increase AIT efficacy Change to a more efficient route of administration Epicutaneous Intralymphatic Increase the dose of allergen by reducing allergenicity by Chemical modification (allergoid) Recombinant modification Not-IgE binding peptides Use of Th1 or Treg promoting TLR ligand CpG oligonucleotides MLP Suppression of Th2 response Th2 cytokine antagonist Adjuvants Probiotics Vitamin D Allergy Asthma Proc 2016;37: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 20
21 Treg or Breg cell-promoting agent & AIT AIT modulate immune reaction through increased production of Treg or Breg cells A new agent that generates Treg or Breg cells could be a potent adjuvant for the development of more effective and safe AIT CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 21
22 Flagellin, TLR5 ligand: A candidate to induce Treg cells CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 22
23 Flagellin suppressed OVA-induced asthma Experimental protocol AHR BAL Lung tissue JACI 2016;137: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 23
24 Flagellin decreased Th2/Th1 cytokines but increased Treg cell cytokines BAL fluids Bronchial LN cultures JACI 2016;137: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 24
25 Flagellin induced Foxp3+ Treg cells CD4+ T cells from bronchial LN JACI 2016;137: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 25
26 CD11c+ DC from bronchial LN Flagellin generated regulatory DC JACI 2016;137: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 26
27 Effect of flagellin on human immune cells HDM-allergic adult asthma patients PBMC monocytederived CD11c+ DC, CD4+ T cells Co-culture (DC+T cell + HDM extract) JACI 2016;137: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 27
28 Intracellular cytokines Effect of flagellin on regulatory DC and Treg cell was reproduced in peripheral blood from asthma patients JACI 2016;137: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 28
29 Summary of flagellin experiments Flagellin induced regulatory DC and Treg cells in mouse and human asthma Flagellin-adjuvanted AIT could maximize AIT efficacy by robust generation of Treg cells JACI 2016;137: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 29
30 Breg cell-promoting probiotics & AIT 60 HDM-allergic adult asthmatics SCIT for 6 m Probiotics: Clostridium butyricum (CB) 4 groups: AIT, AIT/CB, CB, Placebo Am J Transl Res 2016;8: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 30
31 Breg cell-promoting probiotics enhanced the effect of AIT in asthma patients Am J Transl Res 2016;8: CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 31
32 Conclusions Now AIT can be done if asthma is well controlled, regardless of asthma severity (Allergy 2015;70:897). AIT(SLIT) can be added to GINA step 3 or 4 to control asthma (GINA 2017). Future Treg and Breg cell-promoting agents may be potent adjuvants for more effective and safe AIT vaccine. Flagellin, TLR5 ligand, may be one of the useful candidates CHONNAM NATIONAL UNIVERSITY MEDICAL SCHOOL 32
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