Production, Quality Control, Stability and Pharmacotoxicity of a Malaria Vaccine Comprising Three Highly Similar PfAMA1 Protein Molecules to Overcome Antigenic Variation
| Autor: | Alexander Croon, Clemens H. M. Kocken, Nicolas Havelange, Jürgen Drossard, Sophie Houard, Bart W. Faber, Robin Kastilan, Nicole van der Werff, Alan W. Thomas, Hubert Mertens, Marjolein van der Eijk, Richard W. Byrne, Edmond J. Remarque, Stephan Hellwig |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2016 |
| Předmět: |
Male
Metabolic Processes 0106 biological sciences 0301 basic medicine Physiology medicine.medical_treatment Protozoan Proteins lcsh:Medicine Antibodies Protozoan Toxicology Pathology and Laboratory Medicine Biochemistry 01 natural sciences Mice Immunologic Adjuvants Immune Physiology Medicine and Health Sciences Toxins Public and Occupational Health Malaria Falciparum Enzyme-Linked Immunoassays lcsh:Science Vaccines Immune System Proteins Multidisciplinary biology Protein Stability Antigenic Variation Vaccination and Immunization Recombinant Proteins Diafiltration Ectodomain Female Rabbits Adjuvant Research Article Quality Control Plasmodium falciparum Immunology Toxic Agents Bacterial Toxins Antigens Protozoan Research and Analysis Methods Antibodies Pichia pastoris 03 medical and health sciences 010608 biotechnology Malaria Vaccines medicine Antigenic variation Animals Humans Amino Acid Sequence Apical membrane antigen 1 Immunoassays Pharmacology Drug Screening Toxicity lcsh:R Membrane Proteins Biology and Life Sciences Proteins biology.organism_classification Endotoxins Metabolism 030104 developmental biology Fermentation Immunologic Techniques lcsh:Q Preventive Medicine Conformational epitope |
| Zdroj: | PLoS ONE PLoS ONE, Vol 11, Iss 10, p e0164053 (2016) |
| ISSN: | 1932-6203 |
| DOI: | 10.1371/journal.pone.0164053 |
| Popis: | Plasmodium falciparum apical membrane antigen 1 (PfAMA1) is a leading asexual blood stage vaccine candidate for malaria. In preparation for clinical trials, three Diversity Covering (DiCo) PfAMA1 ectodomain proteins, designed to overcome the intrinsic polymorphism that is present in PfAMA1, were produced under Good Manufacturing Practice (GMP) in Pichia pastoris. Using identical methodology, the 3 strains were cultivated in 70-L scale fed-batch fermentations and PfAMA1-DiCos were purified by two chromatography steps, an ultrafiltration/diafiltration procedure and size exclusion chromatography, resulting in highly pure (>95%) PfAMA1-DiCo1, PfAMA1 DiCo2 and PfAMA1 DiCo3, with final yields of 1.8, 1.9 and 1.3 gram, respectively. N-terminal determinations showed that approximately 50% of each of the proteins lost 12 residues from their N-terminus, in accordance with SDS-PAGE (2 main bands) and MS-data. Under reducing conditions a site of limited proteolytic cleavage within a disulphide bonded region became evident. The three proteins quantitatively bound to the mAb 4G2 that recognizes a conformational epitope, suggesting proper folding of the proteins. The lyophilized Drug Product (1:1:1 mixture of PfAMA1-DiCo1, DiCo2, DiCo3) fulfilled all pre-set release criteria (appearance, dissolution rate, identity, purity, protein content, moisture content, sub-visible particles, immuno-potency (after reconstitution with adjuvant), abnormal toxicity, sterility and endotoxin), was stable in accelerated and real-time stability studies at -20°C for over 24 months. When formulated with adjuvants selected for clinical phase I evaluation, the Drug Product did not show adverse effect in a repeated-dose toxicity study in rabbits. The Drug Product has entered a phase Ia/Ib clinical trial. |
| Databáze: | OpenAIRE |
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