CONVENTIONAL VACCINE DEVELOPMENT
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1 CONVENTIONAL VACCINE DEVELOPMENT
2 PROBLEM Lethal germ Dead mouse
3 LIVE VACCINES Related but harmless germ gives protection against lethal pathogen. Examples are the original pox vaccine and some TB vaccines
4 BENEFITS AND DRAWBACKS Pros Relatively safe Strong response Long memory Cons Expensive to produce and store Antigens not identical to the real pathogen
5 Organisms with disabled virulent properties. Examples include yellow fever, measles, rubella, and mumps. LIVE ATTENUATED VACCINES
6 BENEFITS AND DRAWBACKS Pros Strong response against native antigens Long memory Cons Risk of reversion/ conversion Production and storage costs
7 Previously virulent microorganisms which have been killed with chemicals or heat. Examples are flu, cholera, bubonic plague, polio and hepatitis A KILLED VACCINES
8 BENEFITS AND DRAWBACKS Pros Generally very safe Response against native antigens Cons No CTL Shorter memory
9 TOXOIDS Toxoids are inactivated toxins, which is used where the toxin cause illness or death, but the producing organism otherwise will be eliminated. Examples of toxoid-based vaccines include tetanus and diphtheria.
10 BENEFITS AND DRAWBACKS Pros Relatively safe Easy to produce Cons No CTL Shorter memory
11 SUBUNIT VACCINES
12 Johri et al. Nature Reviews Microbiology 4, (December 2006) doi: / nrmicro1552
13 ANTIGEN DISCOVERY
14 Eluted from Ab trapping Johri et al. Nature Reviews Microbiology 4, (December 2006) doi: / nrmicro1552
15 CTL Peptide Scan
16
17 Avian Flu vaccine development by Reverse genetics techniques from the National Institute of Allergy and Infectious Diseases
18 Cleavage sites and binding affinities Collaborators approaches
19 Bioinformatics is data driven Most methods needs a large number of training examples Best if made the same way Validation can be done by different methods Good collaborators are invaluable
20 in vitro cleavage measurements lifeext/aging.html
21 Peptide Digest Workflow Purification of Peptides by RP-HPLC: Synthesized peptides are polished to >98% purity (1h Gradient, 25 cm x 4 mm C18 column), lyophilized and used for digestion Digestion: 100 ul Volume - 15 ul/ Timepoint MSMS-Analysis very fast analysis of peptide digests can be performed in one day multiple time points possible (Instrument time: 90 min/timepoint) Data Processing: Waters Protein Expression System (1-2h processing) Excel-Macros (Manual, 30 min/timepoint)
22 Peptide polishing: very high purity of peptide substrates required, but some peptides ordered at >80% purity are quite dirty -> time consuming polishing of peptides (4-8h) Protocol has been established for routine purification high hydrophobicity of some peptides leads to solubility /purification problems
23 MHC Binding
24 RMAS Assay: classical way to measure peptide binding - However not quantitative (no determination of the affinity) TAP difficient cell line At 37 C At 26 C Add peptide
25 RMAS Assay: classical way to measure peptide binding - However not quantitative (no determination of the affinity) TAP difficient cell line At 37 C At 26 C Add peptide Measure T cell activation
26 Experimental description of peptide-mhc binding How to examine HLA specificity? What the HLA has bound in vivo Elution and sequencing of natural ligands Simpel motif ~ low sensitivity predictions What the HLA will, or will not, bind in vitro Determine the binding strength of any peptide Extended motif ~ higher sensitivity predictions
27 Experimental description of peptide-mhc binding How to examine HLA specificity? What the HLA has bound in vivo Elution and sequencing of natural ligands Simpel motif ~ low sensitivity predictions What the HLA will, or will not, bind in vitro Determine the binding strength of any peptide Extended motif ~ higher sensitivity predictions Hans-Georg Rammensee et al.,
28 How to determine peptide affinity Law of mass action Binding [R] + [L] k off k on [RL] K D = k off (S -1 )/k on (M -1 S -1 ) 100% 50% Saturation assay Binding [MHC] + [P] Binding hot peptide k off k on [P*MHC] Inhibition assay Peptide [M] Peptide Log [M] Cold Peptide Log [M] K D = ( M) Log IC 50
29 How to do radioactive biochemical inhibition binding assays Obtain purified HLA Or recombinant heavy chain & b2m Obtain indicator peptide Perform dose titration of any inhibitory peptide Separate free from bound peptide Calculate binding and IC 50
30 How to do radioactive biochemical inhibition binding assays Obtain purified HLA Or recombinant heavy chain & b2m Obtain indicator peptide Perform dose titration of any inhibitory peptide Separate free from bound peptide Calculate binding and IC 50 Binding test Peptide Non binding test peptide
31 A spun column binding assay b2m peptide G50 MHC
32 A spun column binding assay b2m peptide G50 Non binding test peptid Binding test peptid MHC
33 The radioactive biochemical binding assay PROS Truly quantitative Can address affinities in the low nm level Reproducible CONS Radioactive Not a standard method Waste problem
34 The Quantitative ELISA Capable of Determining Peptide-MHC Class I Interaction Made possible by our recent development of highly active recombinant MHC class I heavy chains functional equivalents of empty molecules Pros: L.O.Pedersen et al.,, EJI. 2001, 31: 2986 Reasonably simple, sensitive and quantitative Does not depend on labeled peptide It is easily adaptable to other laboratories Disseminated protocol and standard reagents
35 Strategy for the assay Step I: Folding of MHC class I molecules in solution
36 Strategy for the assay Step I: Folding of MHC class I molecules in solution Incubation
37 Strategy for the assay Step I: Folding of MHC class I molecules in solution Incubation Step II: Detection of de novo folded MHC class I molecules by ELISA
38 Strategy for the assay Step I: Folding of MHC class I molecules in solution Incubation Step II: Detection of de novo folded MHC class I molecules by ELISA
39 Strategy for the assay Step I: Folding of MHC class I molecules in solution Incubation Step II: Detection of de novo folded MHC class I molecules by ELISA
40 Strategy for the assay Step I: Folding of MHC class I molecules in solution Incubation Step II: Detection of de novo folded MHC class I molecules by ELISA
41 Strategy for the assay Step I: Folding of MHC class I molecules in solution Incubation Step II: Detection of de novo folded MHC class I molecules by ELISA
42 Strategy for the assay Step I: Folding of MHC class I molecules in solution Incubation Step II: Detection of de novo folded MHC class I molecules by ELISA Development Sensitivity below 0.1 nm or 5 x M MHC class I complex!
43 ELISA driven assay nm complex detected nm peptide offered Concentrations of complexes generated are plotted as a function of the concentration of peptide offered Sylvester-Hvid, C. et al., Tissue Antigens (2002) 59:251
44 ELISA driven assay nm complex detected nm peptide offered Concentrations of complexes generated are plotted as a function of the concentration of peptide offered Sylvester-Hvid, C. et al., Tissue Antigens (2002) 59:251
45 ELISA driven assay Results are expressed as: nm complex detected nm peptide offered B MAX : Amount of detected complex including 95% confidence interval Concentrations of complexes generated are plotted as a function of the concentration of peptide offered Sylvester-Hvid, C. et al., Tissue Antigens (2002) 59:251
46 ELISA driven assay Results are expressed as: nm complex detected nm peptide offered B MAX : Amount of detected complex including 95% confidence interval K D : Peptide affinity including 95% confidence interval Concentrations of complexes generated are plotted as a function of the concentration of peptide offered Sylvester-Hvid, C. et al., Tissue Antigens (2002) 59:251
47 ELISA driven assay Results are expressed as: nm complex detected nm peptide offered B MAX : Amount of detected complex including 95% confidence interval K D : Peptide affinity including 95% confidence interval Automated, 384 format Concentrations of complexes generated are plotted as a function of the concentration of peptide offered Sylvester-Hvid, C. et al., Tissue Antigens (2002) 59:251
48 AlphaScreen Pros Homologous proximity assay. No washing => fast development Donor bead Acceptor bead Cons Expensive reagents Specialized reader O 2 <200 nm
49 AlphaScreen Biotin Streptavidin anti-mouse IgG W6/32 mouse anti- HLA
50 AlphaScreen Biotin Streptavidin anti-mouse IgG W6/32 mouse anti- HLA
51 AlphaScreen 480 nm O nm Biotin Streptavidin anti-mouse IgG W6/32 mouse anti- HLA
52 AlphaScreen
53 TAP Binding
54 TAP Binding TAP is very hard to purify for in vitro assays (membrane bound) Most used assay is the radioactive RIA assay IC 50 from RIA assays are dependent of the affinity of the competing peptide
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