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Public Security S&T Symposium 2009

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Presentation on theme: "Public Security S&T Symposium 2009"— Presentation transcript:

1 Public Security S&T Symposium 2009
Pre-clinical Development of a Nasal Adenovirus-Based Vaccine Against Ebola Virus (CRTI RD)

2 PROJECT BACKGROUND An ongoing NIH sponsored phase 1 clinical trial is evaluating Adenovirus-based vaccine to stimulate significant immune responses against Ebola virus. Goal: Pre-clinical development of a nasal adenovirus-based vaccine against Ebola virus. We have developed an optimized adenovirus-based Ebola vaccine that can stimulate both mucosal and systemic immune responses following nasal immunization. The first objective is to develop a formulated pre-clinical grade optimized AdHu5 EBOV vaccine. The second objective is to advance the knowledge on immune correlates of protection against EBOV in NHPs.

3 Different Vaccine Strategies
DNA Vaccinia VEE replicon VLPs (Warfield et al. 2007) HPIV3 VSV Adenovirus Have successfully protected NHP (Bukreyev et al., 2007) (Jones et al., 2005) (Sullivan et al., 2000)

4 Objective To optimize expression of the ZEBOV glycoprotein from an adenoviral vector and compare it to the CMV driven EboGP Ad vaccine vector. Improving the expression cassette Codon optimization Improved CAG promoter

5 FIX MMI: Computer control
Image created by Robert Voyer, BRI-ACTDSP, JAN. 1998

6 Ad5-GFP-Q production in 60L- Bioreactor

7 Adenovirus Purification
Production Cell lysis LIQUID Harvest Ultrafiltration Concentration Filtration SOLID Anion-Exchange Chromatography Fractogel EMD-DEAE Size Exclusion Sephacryl S-400 Purified Adenovirus DNAse treatment Centrifuge/ conditioning RETENTATE Concentrated Adenovirus PERMEATE (Waste)

8 Recombinant Adenovirus
Expression Ebola ZGP Recombinant Adenovirus HEK 293 Ad-CMV/ZGP Ad-CAG/OptZGP

9 Survival and weight loss 28 days post-vaccination
Vaccine Concentration (IFU/Mouse) Survival (Percentage) Weight Loss (Percentage) Ad-CMVZGP 1 x 107 100 1 x 106 1 x 105 40 17 Ad-CAGoptZGP 1 x 104 Control na1 >25 Mice were challenged with a lethal dose (LD50 = 1000) of mouse-adapted ZEBOV

10 Survival of mice 30 min post challenge

11 Percentage weight loss in post-exposure treatment

12 Immune response 6 days post-vaccination

13 Formulations Tested 1 Saline, vehicle control (pH 7.4)
2 Ad-ZGP in PBS (pH 7.4) 3 Ad-ZGP + Base formulation (Sucrose (10mg/ml), Mannitol (40mg/ml) and Pluronic F68 (0.001%)) 4 Ad-ZGP + Base formulation + Selenium (1ug/ml) 5 Ad-ZGP + Base formulation + beta-cyclodextrin (0.5%) 6 Ad-ZGP + tertiary amine beta-cyclodextrin (5%) 7 Ad-ZGP + chitosan (1%) 8 Ad-ZGP + Base formulation + chitosan (1%) 9 PEGylated Ad-ZGP in PBS (pH 7.4) 10 PEGylated Ad-ZGP + Base formulation

14 Effect of Formulation on Transduction of Calu-3 cells

15 Frequency of IFN Positive Cells 10 Days After Vaccination (ELISPOT)

16 Neutralizing Antibody Levels Against Zaire Ebola GP 16 Days After Vaccination

17 Survival Upon Challenge with Mouse Adapted Ebola
Promising Preparations Unsuccessful Preparations

18 Guinea pigs Initial Treatment Ad-lacZ I.M. Ad-lacZ I.N. Nil
Dose (Total Infectious Particles) 2.5 x 1011 n/a Serum Neutralizing Antibodies Detected cde 122 ± 52 153.9 ± 124.2 8.9 ± 7.7 22.2 ± 27.8 Nasal Lavage Neutralizing Antibodies Detected cde Secondary Vaccination f Ad-CAGoptZGP I.N. Ad-CAGoptZGP I.M. PBS 1 x 1010 Serum Neutralizing Antibodies Detected i 20 ± 13 23 ± 8 40 ± 35 20 ± 20 Nasal Lavage Neutralizing Antibodies Detected i 13 ± 12 7 ± 12 27 ± 12 Maximum Weight Loss (%) 1 ± 1.9 1 ± 2.8 1 ± 1.8 3 ± 2.4 >20 Percent Survival 100% 0%

Significant progress steps related to milestones Comparative evaluation of the first and second generation Ad-Ebo vaccines in mice and guinea pigs. Key Technical Accomplishments, Innovations, Inventions 100-fold improvement in protective dose, post-exposure protection and overcoming pre-existing immunity. Potential linkages to projects not defined in the Project Charter. Gene optimization may be beneficial to other vaccine platform such as VSV.

The optimized vaccine also fully protected mice against a lethal challenge with ZEBOV at a dose 100 times lower than the minimal dose required to achieve full protection with the first generation vaccine. Complete survival was also achieved 30 minutes post-exposure although weight loss was observed. Higher number of IFN-γ, TNF-α and IL-2 positive CD8 T cells and NAB were detected from splenocytes of Ad-CAGoptZGP immunized mice 6 days post-vaccination when compared to AdCMVZGP immunized mice. Several promising formulations have been identified. Mice vaccinated by the nasal route with these preparations have similar or slightly improved immune responses against Ebola and can survive challenge. Published in: PLoS ONE, 2009;4(4):e5308. Epub 2009 Apr 23.

Core Members: Project Champion: Dr. Harvey Artsob Project Manager: Dr. Gary Kobinger Portfolio Manager: Norm Yanofsky NRC Management Representative: Dr. Amine Kamen University of Texas Management Representative: Dr. Maria Croyle Associate Members: Procurement Lead: Daniele Cole / Doris Bruneau Deputy Project Manager: Dr. Jim Strong Recording Secretary: Doris Bruneau

22 Routes of immunization: protection in mice against 200 LD50 of MA-Ebola virus
Intramuscular (I.M.) (%) Intranasal (I.N.) Oral Vehicle AdHu5-ZGP 100 100 AdHu5-ZGP + human Ig

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