Thermophilic Filamentous Fungus C1-Cell-Cloned SARS-CoV-2-Spike-RBD-Subunit-Vaccine Adjuvanted with Aldydrogel®85 Protects K18-hACE2 Mice against Lethal Virus Challenge.
Vaccines (Basel)
; 10(12)2022 Dec 11.
Article
em En
| MEDLINE
| ID: mdl-36560529
ABSTRACT
SARS-CoV-2 is evolving with increased transmission, host range, pathogenicity, and virulence. The original and mutant viruses escape host innate (Interferon) immunity and adaptive (Antibody) immunity, emphasizing unmet needs for high-yield, commercial-scale manufacturing to produce inexpensive vaccines/boosters for global/equitable distribution. We developed DYAI-100A85, a SARS-CoV-2 spike receptor binding domain (RBD) subunit antigen vaccine expressed in genetically modified thermophilic filamentous fungus, Thermothelomyces heterothallica C1, and secreted at high levels into fermentation medium. The RBD-C-tag antigen strongly binds ACE2 receptors in vitro. Alhydrogel®'85'-adjuvanted RDB-C-tag-based vaccine candidate (DYAI-100A85) demonstrates strong immunogenicity, and antiviral efficacy, including in vivo protection against lethal intranasal SARS-CoV-2 (D614G) challenge in human ACE2-transgenic mice. No loss of body weight or adverse events occurred. DYAI-100A85 also demonstrates excellent safety profile in repeat-dose GLP toxicity study. In summary, subcutaneous prime/boost DYAI-100A85 inoculation induces high titers of RBD-specific neutralizing antibodies and protection of hACE2-transgenic mice against lethal challenge with SARS-CoV-2. Given its demonstrated safety, efficacy, and low production cost, vaccine candidate DYAI-100 received regulatory approval to initiate a Phase 1 clinical trial to demonstrate its safety and efficacy in humans.
BALB/c mice; C-tag; CHO-cell; COVID-19; IgG; IgG1 and IgG2b; K18-hACE-2 mice; Myceliophthora thermophila; RBD; SARS-CoV-2; Thermothelomyces heterothallica; adjuvant; alum; aluminum-based vaccine adjuvants; antigen; baculovirus; biomanufacturing; dyadic; efficacy; glycans; glycoprotein; glycosylation; insect cells; intranasal challenge; neutralizing antibodies; pandemic; receptor binding domain; recombinant protein subunit vaccine; stability; toxicology; vaccine; variants of concern; virus; zoonotic
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Vaccines (Basel)
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Israel