BBIQ, a pure TLR7 agonist, is an effective influenza vaccine adjuvant.

Abstract:

:Better adjuvants are needed for vaccines against seasonal influenza. TLR7 agonists are potent activators of innate immune responses and thereby may be promising adjuvants. Among the imidazoquinoline compounds, 1-benzyl-2-butyl-1H-imidazo[4,5-c]quinolin-4-amine (BBIQ) was reported to be a highly active TLR7 agonist but has remained relatively unexplored because of its commercial unavailability. Indeed, in silico molecular modeling studies predicted that BBIQ had a higher TLR7 docking score and binding free energy than imiquimod, the gold standard TLR7 agonist. To circumvent the availability issue, we developed an improved and higher yield method to synthesize BBIQ. Testing BBIQ on human and mouse TLR7 reporter cell lines confirmed it to be TLR7 specific with significantly higher potency than imiquimod. To test its adjuvant potential, BBIQ or imiquimod were admixed with recombinant influenza hemagglutinin protein and administered to mice as two intramuscular immunizations 2 weeks apart. Serum anti-influenza IgG responses assessed by ELISA 2 weeks after the second immunization confirmed that the mice that received vaccine admixed with BBIQ had significantly higher anti-influenza IgG1 and IgG2c responses than mice immunized with antigen alone or admixed with imiquimod. This confirmed BBIQ to be a TLR7-specific adjuvant able to enhance humoral immune responses.

journal_name

Hum Vaccin Immunother

authors

Kaushik D,Dhingra S,Patil MT,Piplani S,Khanna V,Honda-Okubo Y,Li L,Fung J,Sakala IG,Salunke DB,Petrovsky N

doi

10.1080/21645515.2019.1710409

subject

Has Abstract

pub_date

2020-08-02 00:00:00

pages

1989-1996

issue

8

eissn

2164-5515

issn

2164-554X

journal_volume

16

pub_type

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