Stimulation of mucosal immunity by pulmonary delivery of live vaccines. A safe and effective strategy against TB Nacho Aguilo ([email protected]) Les Diablerets, 3rd February 2016
Stimulation of mucosal immunity by pulmonary delivery of live vaccines.
A safe and effective strategy against TB
Nacho Aguilo ([email protected])
Les Diablerets, 3rd February 2016
TB infection Live TB Vaccine
MIMIC NATURAL ROUTE OF INFECTION
INDUCE STRONG SPECIFIC MUCOSAL RESPONSE IN THE SITE OF INFECTION
Lagranderie et al. 1993 Kaushal et al. 2015 Chen et al. 2004
Giri et al. 2006
Aguilo et al. 2015
Goonetilleke et al. 2003
Tree et al. 2004
ANIMAL MODELS TESTED WITH PULMONARY LIVE VACCINES
Pulmonary vaccination with live vaccines is safe in preclinical models
Tree et al. 2004
SAFETY DATA OF BCG PULMONARY VACCINATION IN PRECLINICAL MODELS
Lagranderie et al. 1993
• Weekly BCG doses of 3x107 by the aerosol route • No hepatic or pulmonary toxicity was doccumented during the study
Lagranderie et al. 1993. Tubercle and Lung Disease
aerosol
subcutaneous
LogCFUs
Guinea Pigs
EFFICACY DATA IN ANIMAL MODELS
Lihao Chen et al. 2004 Infection and Immunity
Balb/c mice
EFFICACY DATA IN ANIMAL MODELS
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0.71 log 1.3 log 1.8 log
Aguilo et al. 2012. Clinical Vaccine Immunology
C57BL/6 mice
EFFICACY DATA IN ANIMAL MODELS
Aguilo et al. 2012. Clinical Vaccine Immunology
ns
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*
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C57BL/6 mice Dose response profile in BCG pulmonary
vaccination
EFFICACY DATA IN ANIMAL MODELS
*
Unpublished results
BCG IN boosts BCG SC vaccination
RE-VACCINATION OF BCG SC-IMMUNIZED MICE WITH BCG IN
Does pulmonary BCG work where parenteral immunization fails?
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subcutaneous
LogCFUs
Parenteral BCG immunization confers good protection in preclinical models used to test TB vaccines
TB susceptible and resistant mouse strains
Medina et al. 1998 Immunology
DBA/2 MOUSE STRAIN
Medina et al. 1999 Immunology Gruppo et al. 2002 Microbiology
BCG subcutaneous poorly protects DBA/2 mice against TB challenge
DBA/2 MOUSE STRAIN
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s.c. BCG Danish 106 CFUS i.n. Challenge H37Rv ≈ 150 CFUS
Sacrifice
8 weeks 4 weeks
BCG s.c does not confer protection to DBA/2 mice
PROTECTIVE EFFICACY (CFU in lungs)
ns
Aguilo et al. Journal of Infectious Diseases. IN PRESS
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s.c. or i.n BCG Danish 106 CFUS Sacrifice
8 weeks 4 weeks
i.n. Challenge H37Rv ≈ 150 CFUS
BCG i.n confers protection to DBA/2 mice in lungs and spleen
PROTECTIVE EFFICACY (CFU in lungs and spleen)
Aguilo et al. Journal of Infectious Diseases. IN PRESS
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s.c. or i.n BCG Danish 106 CFUS
8 weeks Survival
i.n. Challenge H37Rv ≈1000 CFUS
PROTECTIVE EFFICACY (Survival)
Aguilo et al. Journal of Infectious Diseases. IN PRESS
s.c. or i.n BCG Danish 106 CFUS
8 weeks
PPD-specific immune response
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Lung Spleen
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IFNg
IL17A
BCG intranasal induces both local and systemic higher Th1 and Th17
IMMUNOGENECITY PRE-CHALLENGE
Aguilo et al. Journal of Infectious Diseases. IN PRESS
s.c. or i.n BCG Danish 106 CFUS Sacrifice: CFUs and PPD-specific immune response
8 weeks 4 weeks
i.n. Challenge H37Rv ≈ 150 CFUS
CFUs PPD-specific immunity
IMMUNOGENECITY POST-CHALLENGE
Aguilo et al. Journal of Infectious Diseases. IN PRESS
challenge
p=0.02
* *
challenge
Th17 lung response post-challenge correlates with better protection
IMMUNOGENECITY POST-CHALLENGE
Aguilo et al. Journal of Infectious Diseases. IN PRESS
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s.c. or i.n BCG Danish 106 CFUS Sacrifice
8 weeks 4 weeks
- i.n. Challenge H37Rv ≈ 150 CFUS - PPD-specific immune response
aIL17A treatment (clone 17F3)
**
IL17A contributes to
protection mediated
by BCG intranasal
ROLE OF IL17A IN PROTECTIVE EFFICACY
Aguilo et al. 2016. Journal of Infectious Diseases. IN PRESS
MUCOSAL IMMUNOGLOBULINS (IgA)
Johansen et al. 2011. Mucosal Immunology
Johansen et al. 1999. Journal of Experimental Medicine
WT pIgR -/-
pIgR FUNCTION
Achkar et al. 2013
ROLE OF IgA IN PROTECTIVE EFFICACY
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pIgR 100 kDa
120 kDa
Induction of MTB-specific IgA by BCG
intranasal in an IL17-dependent fashion
IgA INDUCTION BY BCG IN BAL
Aguilo et al. Journal of Infectious Diseases. IN PRESS
Unpublished results
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PROTECTION AND IgA INDUCTION BY HEAT-KILLED MTB
BAL SAMPLES
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• Good safety profile of live pulmonary vaccines in different preclinical models. • Pulmonary route of administration is more effective than parenteral vaccination in
animal models.
• Pulmonary vaccination can work where parenteral immunization fails.
• Possible role of IL17 in BCG pulmonary-induced protection. • Good correlation of specific IgA in BAL with protection
SUMMARY
Nacho Aguiló
José Antonio Aínsa*
Henar Alonso
Esther Broset
Alberto Cebollada
Ana Belén Gómez
Jesús Gonzalo
Begoña Grácia
Mª José Iglesias Gozalo*
Carmen Lafoz
Elena Mata
Raquel Tarancón
* IP coordinadores de línea
Carlos Lampreave
Dessi Marinova
Isabel Otal*
Ana Pico
Sofía Samper *
Luis Solans
Santiago Uranga
Samuel Álvarez
Liliana Rodrigues
Irene Perez
Grupo de Genética de Micobacterias http://genmico.unizar.es
Microbiología Clínica
Mª José Revillo Pinilla
Asunción Vitoria
Dirección General de Salud Pública
Grupo de Apoptosis, Inmunidad y
Cancer
Alberto Anel
Julian Pardo
Centro de Encefalopatías y
Enfermedades Emergentes
Marta Monzón
Juan J Badiola