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Phase 1 Study of the Safety and Immunogenicity of Na-GST-1/Alhydrogel, With or Without a CpG ODN Adjuvant, in Healthy Adults
In Brief
A Phase 1 clinical trial evaluating Na-GST-1/Alhydrogel® and CpG 10104 for Hookworm Infection and Hookworm Disease. Completed, enrolled 24 participants across 1 site.
Detailed Summary
Na-GST-1 is a protein expressed during the adult stage of the hookworm life cycle that is thought to play a role in the parasite's degradation of host hemoglobin for use as an energy source. Vaccination with recombinant GST-1 has protected dogs and hamsters from infection in challenge studies. This study will evaluate the safety and immunogenicity of two formulations of Na-GST-1 in healthy adult volunteers when co-administered with the immunostimulant CpG 10104, a Toll-like Receptor-9 agonist.
Study Details
Timeline
Interventions
The Na-GST-1 candidate vaccine contains the recombinant Na-GST-1 protein expressed by Pichia pastoris. Purified Na-GST-1 was subsequently adsorbed onto aluminum hydroxide gel (Alhydrogel®) and suspended in a solution containing 10% glucose and 10 mM imidazole. The final concentration of Na-GST-1 in the drug product is 0.1 mg/ml whereas that of Alhydrogel® is 0.8 mg/ml. Different doses of Na-GST-1 will be delivered by injecting different volumes of the 0.1 mg/ml Na-GST-1 preparation.
Unmethylated cytosine-guanine dinucleotides (CpGs) are found in bacterial DNA in the expected frequency predicted by random usage, whereas their occurrence is suppressed 4-fold in vertebrate DNA. In vertebrate DNA CpG motifs are also usually methylated. Bacterial CpG-DNA motifs are recognized by the human innate immune system via Toll-like Receptor-9 (TLR-9), a pathogen-associated molecular pattern (PAMP) receptor that is expressed, in particular, by antigen-presenting dendritic cells. Interactions between CpG-DNA and TLR9 rapidly activate antigen-presenting dendritic cells to upregulate co-stimulatory molecules and to produce Th1-polarizing cytokines such as interleukin-12 and interferon gamma. CpG 10104 is a short synthetic oligodeoxynucleotide of the following sequence: 5'-TCG TCG TTT CGT CGT TTT GTC GTT-3'.