prof. dr. u. wahn how can we prevent u. wahn department of pediatric pneumology and immunology
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Prof. Dr. U. Wahn
How can we preventHow can we prevent
U. Wahn
Department of Pediatric Pneumology and Immunology
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EPAAC Atopic Dermatitis Severity (SCORAD)
Atopic Dermatitis Severity (SCORAD)
0
10
20
30
40
0 1 3 6 9 12 15 18
Months
Sc
ora
d S
co
re
Placebo
Lctz
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0
1
10
100
1 2 3 5 6
Sp
ecif
ic I
gE
(kU
/l)
Years
Cow's milk
0
1
10
100
1 2 3 5 6
Sp
ec
ific
IgE
(k
U/l)
Years
Birch
Natural course of sIgE concentrations
(Kulig et al, JACI 1999)
Natural course of sIgE concentrationsNatural course of sIgE concentrations
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Prevalence of current wheeze from birth to age 13 years in
children with any wheezing episode at schoolage (5 – 7 yrs),
stratified for atopy at schoolage
MAS-90
0
10
20
30
40
50
60
70
80
1 2 3 4 5 6 7 8 9 10 11 12 13
Age (in years)
Wheezing at school age (5–7 yrs): non-atopic atopic
S. Illi et al., Lancet 2006
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Early sensitisation and allergen exposure to perennial
allergens * and lung function at school age
0
20
40
60
80
100
120
140
160
FEV1 (% pred) MEF75 (% pred) MEF50 (% pred) MEF25 (% pred)
p = 0.020
p = 0.003
FEV1 (% FVC)
p = 0.018
p = 0.003
p = 0.001
p = 0.025
p < 0.001
not sensitised sensitised / low exposure sensitised / high exposure
Mea
n +
/–
SD
* Sensitisation / exposure to mites and/or cats up to the age of 3 yearsMAS-90
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Target Groups for prevention:The windows of opportunity
Primary Prevention (no clinical signs) in high risk or low risk infants (1 – 6 months) Secondary prevention (6 – 36 months) in infants/young children with a) early wheeze b) atopic dermatitis c) sensitization to egg/milk d) early sensitization to indoor allergens e) combination of risk factors Disease modification (school age) Children with SAR
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Parental Phenotypes
Infantile Phenotypes
Atopy/Asthma Atopy/Asthma
AD Wheeze
Food Sensitization
Perennial aero-
sensitization
Food Sensitization
Perennial aero-
sensitization
Persistent asthma
in adolescene
SpecificGeneMutation
SpecificGeneMutation
The child at risk for asthma The child at risk for asthma Candiates for preventive interventionCandiates for preventive intervention
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Combining family history and early phenotypes with specific
gene mutations may help to identify the child with persistant
asthma within the first year of life
Prediction instead of risk assessment!
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Primary prevention
• Diet in early infancy- breast milk- hypoallergenic formulae (high risk!)- probiotics (lactobacilli)- prebiotic formula (low risk and high risk!)
• Avoidance of tobacco smoke exposure
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Saarinen UM et al. Prolonged breast-feeding as prophylaxis for atopic disease.
Lancet 1979; 2:163-166
Saarinen UM et al. Breast-feeding as prophylaxis against atopic disease:
prospective follow-up study until 17 years old.
Lancet 1995; 346:1065-1069
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van Odijk J et al. Breastfeeding and allergic disease: a multidisciplinary review of the literature (1966-2001) on the mode of early feeding in infancy and its impact
on later atopic manifestations.Allergy 2003; 58:833-843
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Certain hydrolyzed formulas reduce the incidence of atopic dermatitis but not that of
asthma: Three-year results of the German Infant Nutritional Intervention Study
Andrea von Berg et al. J Allergy Clin Immunol, 2007;119:718-25
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0
5
10
15
20
25
0 1. Year 2. Year 3. Year
KMF pHF-MeHF-M eHF-C
Cumulative Incidence of ADCumulative Incidence of AD
%
*p < 0.05 für pHF-M and eHF-C vs KMF
*
*
*
*
**
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Model Population Proposed protective factors
Regionality Former East Germany
Common colds in infancy
Farming Lifestock Farming Unpasteurized milkendotoxin in dust
Anthroposophy Antropos. Pupils Infections ?microbial flora? avoidance of vaccines/antibiotics?
Migration Migrants ???
Populations with low susceptibility for atopy
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Prevalence of Hay Fever (A), Hay Fever Symptoms (B), and Prevalence of Hay Fever (A), Hay Fever Symptoms (B), and Atopic Sensitization (C) in Relation to Endotoxin-LoadAtopic Sensitization (C) in Relation to Endotoxin-Load
N Engl J Med 2002; 347 (12):869-77
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BACTERIAL MOLECULES
ISS-ODN (CpG motifs)
4
Modified LPS 5
PAMPs
Pathogen Associated Molecular Patterns (interaction with PRR)
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Protective „farm-effect“Protective „farm-effect“
Ege. J. Allergy Clin. Immunol. 2006; 117: 817.
PARSIFAL study population n=285/ 2086 Atopic sensitisation
Current farm exposure 0.96 (0.63-1.46) p=0.854Regular contact with farm animals ever 0.76 (0.51-1.15) p=0.194Farm milk consumption ever 0.76 (0.52-1.11) p=0.162Stable exposure in pregnancy 0.58 (0.39-0.86) p=0.007
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The effect of farm milk consumption on The effect of farm milk consumption on asthmaasthma
Bieli Ch., JACI 2007; 120: 1308-1315
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Intervention strategies: The „protective factor“ concept
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“Probiotic Bacteria”: Lactobacilli & Bifidobacteria
Rationale
1995-98 to increase gut “barrier”
1999-2000 stimulate TH1 to suppress TH2
2000-….. stimulate T reg & cytokines
aspecific immunomodulation
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Mouse Model
Prenatal initiation of exposure to LPS via the airways
– inhibited allergen-mediated sensitisation and airway inflammatory responses in the offspring
associated with increased expressions of
– LPS receptors– Th1-controlling transcription factor T-betGerhold et al. J. Allergy Clin. Immunol. 2006; 118: 666.
LPS Aerosol
-7-14-21 0DayMother
Birth
OVA i.p.
605758
OVA Aerosol
Offspring
1 25 28
LPS Aerosol
42 56
IgE Eosinophilic AI
AR
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Treatment phase of human intervention studyTreatment phase of human intervention study
Primary outcome within treatment phase
Effect of oral bacterial compounds on
atopic eczema
sensitisation to food allergens
635 InfantsAtopic Background
Bacterial lysates of E. coli / Strept. faecalis p.o.
1 2 3 4 5Month of Life 6
ADPlacebo p.o.
7
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Synbiotics
living bacteriain the food
Probiotics
% survival ?
activity ?
excretion
active exogeneous
bacteria
neutral HMOS(GOS/FOS)
Prebiotics
fermentation in the colon
promotion of active endogeneous
beneficial bacteria
Prebiotic, Probiotic and Synbiotic Food
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Prebiotic prevention study teamPrebiotic prevention study team
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Cumulative Incidence of Atopic Dermatitis • Group differences develop slowly during study period.
Development for BF infants delayed. • As numbers are low, significance between formula groups is
reached only after 1 year.
0
2
4
6
8
10
12
8 16 24 52
Weeks of life
(%)
Total Active (n=414) Total Control (n=416) Total Breast (n=300)
35
1
15
20
4
19
32
10
23
39
20
p=0.0469
p=0.082
p=0.0153
p=0.0109
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Incidence of Atopic Dermatitis (MIP-Study)
Time to first occurrence of AD significantly different between both formula groups according 2-sided logrank test: p=0.0411
BF (n=20)
Control(N=39)
Prebiotic formula(N=23)
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Prophylaxis of atopy and asthma Prophylaxis of atopy and asthma in childrenin children
Immune Tolerance Network (NIH)Immune Tolerance Network (NIH)
• Inclusion criteria:• Children 12 – 30 months of age (n=200)• Atopic dermatitis, sensitisation to food • No sensitisation to aeroallergens• Positive family history for atopy/asthma
• Primary end points:• Allergic sensitisation
• Secondary end points:• Current asthma 3 years after the end of intervention
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Enrolment Randomisation(n=200)
(age 12 – 30 month)
(Cat, house dust mites, grass)Allergens
Placebo
EndpointAssessment
(ITT/ PP)
12 months of oral application
Follow-up
Study DesignStudy Design
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Helminth therapy for Crohn’s Disease
Summers R. Gastroenterology, 2005;128:825-832
Trichuris suis eggs
Joel Weinstock
Randomized, DBPC trial in 54 patients with active colitis, randomly assigned to receive placebo or ova treatment. Patients received 2500 Trichuris suis ova or placebo orally at 2-week intervals for 12 weeks.
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Trichuris Suis Ova
• Porcine whipworm; very similar to human whipworm, but does not reproduce in humans
• Eggs hatch, populate human gut for 2 – 3 weeks, then die
• Can be extracted from pathogen-free pigs
• Present in large numbers in farming communities
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Trichuris Suis Ova
• Appears to help restore proper immune function in autoimmune disorders (Crohn‘s disease)
• Appears to have no side effects
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THE PAT STUDY
Denmark: A. Høst, S. Halken
Sweden: C. Møller, S. Dreborg, H.A. Ferdousi
Finland: E. Valovirta
Austria: R. Urbanek, D. Koller
Germany: U. Wahn, B. Niggemann
ALK: S. Sparholt, H. Løwenstein, L. Jacobsen,
Monitor: Lotte Askevig
Statistics: Jannik Godt
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Specific immunotherapy and asthma prevention in children
Niggemann et al. Allergie 2006, 61, 855
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Acknowledgement
Berlin:S. LauR. NickelR. BergmannC. GrüberP. MatricardiB. NiggemannT.Keil
Partners:S. IlliE. von MutiusC.P. BauerJ. ForsterV. WahnW. Kamin
EPAAC-Cohort:J.O. WarnerA. Huret (Business Effisciences)EPAAC Board and study group
MIPS-Cohort:J. JelinekG. BoehmMIPS-study group
ITN-Cohort:P. HoltP. SlyB. BjorkstenH. Sampson
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Funding
• German Ministry of Education and Research (BMBF)
• German Research Foundation (DFG)
• Ga2len (EU-Network of Excellence, 7th framework program)
• Numico Research, Wageningen NL
• UCB Pharma