Egg yolk immunoglobulin (IgY) targeting SARS-CoV-2 S1 as potential virus entry blocker.
J Appl Microbiol
; 132(3): 2421-2430, 2022 Mar.
Article
in English
| MEDLINE | ID: covidwho-1488216
ABSTRACT
AIMS:
COVID-19 pandemic caused by SARS-CoV-2 has become a public health crisis worldwide. In this study, we aimed at demonstrating the neutralizing potential of the IgY produced after immunizing chicken with a recombinant SARS-CoV-2 spike protein S1 subunit. METHODS ANDRESULTS:
E. coli BL21 carrying plasmid pET28a-S1 was induced with IPTG for the expression of SARS-CoV-2 S1 protein. The recombinant His-tagged S1 was purified and verified by SDS-PAGE, Western blot and biolayer interferometry (BLI) assay. Then S1 protein emulsified with Freund's adjuvant was used to immunize layer chickens. Specific IgY against S1 (S1-IgY) produced from egg yolks of these chickens exhibited a high titer (125,600) and a strong binding affinity to S1 (KD = 318 nmol L-1 ). The neutralizing ability of S1-IgY was quantified by a SARS-CoV-2 pseudotyped virus-based neutralization assay with an IC50 value of 0.99 mg ml-1 . In addition, S1-IgY exhibited a strong ability in blocking the binding of SARS-CoV-2 S1 to hACE2, and it could partially compete with hACE2 for the binding sites on S1 by BLI assays.CONCLUSIONS:
We demonstrated here that after immunization of chickens with our recombinant S1 protein, IgY neutralizing antibodies were generated against the SARS-CoV-2 spike protein S1 subunit; therefore, showing the potential use of IgY to block the entry of this virus. SIGNIFICANCE AND IMPACT OF THE STUDY IgY targeting S1 subunit of SARS-CoV-2 could be a promising candidate for pre- and post-exposure prophylaxis or treatment of COVID-19. Administration of IgY-based oral preparation, oral or nasal spray may have profound implications for blocking SARS-CoV-2.Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Immunoglobulins
/
Virus Internalization
/
Antibodies, Neutralizing
/
Spike Glycoprotein, Coronavirus
/
SARS-CoV-2
Type of study:
Experimental Studies
Limits:
Animals
/
Humans
Language:
English
Journal:
J Appl Microbiol
Journal subject:
Microbiology
Year:
2022
Document Type:
Article
Affiliation country:
Jam.15340
Similar
MEDLINE
...
LILACS
LIS