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Recombinant flagellins with deletions in domains D1, D2, and D3: Characterization as novel immunoadjuvants.

Abstract：

:Bacterial flagellin activates the innate immune system and ultimately the adaptive immune system through a Toll-like receptor 5 (TLR5)-dependent signaling mechanism. Given that TLR5 is widely distributed in epithelia, flagellin is currently being developed as a mucosal adjuvant. Flagellin FliC from Salmonella enterica has four domains: the conserved D0 and D1 domains and the hypervariable D2 and D3 domains. The deletion of D3 and partial deletion of D2 in the recombinant FliCΔ174-400 strongly impairs flagellin's intrinsic antigenicity but does not affect the TLR5-dependent immunostimulation activity, i.e., the capacity to promote innate responses and adaptive responses to co-administered antigens. Here, we describe the development of novel recombinant flagellins with various deletions encompassing all of D2 and D3, and part of D1. Most of the recombinant molecules conserved an α-helical secondary structure that was as resistant to heat denaturation as the native protein. Whereas the recombinant flagellins' ability to trigger TLR5 varied markedly in vitro, most gave equivalent in vivo TLR5-dependent innate immune responses following intranasal administration of 2 μg of flagellin to mice. Concordantly, the recombinant flagellins were also valuable respiratory adjuvants for eliciting antibody responses to the foreign antigen ovalbumin, although their intrinsic antigenicity was decreased compared to the native flagellin and not increased compared to FliCΔ174-400. Our results show that the additional deletions of D2 and the distal part of D1 of FliCΔ174-400 does not impact on antigenicity and does not significantly modify the immunostimulatory adjuvant activity. Altogether, this study generated a novel set of recombinant flagellin that constitutes a portfolio of TLR5-dependent candidate adjuvants for vaccination.

journal_name

Vaccine

journal_title

Vaccine

authors

Biedma ME,Cayet D,Tabareau J,Rossi AH,Ivičak-Kocjan K,Moreno G,Errea A,Soulard D,Parisi G,Jerala R,Berguer P,Rumbo M,Sirard JC

doi

10.1016/j.vaccine.2018.12.009

subject

Has Abstract

pub_date

2019-01-21 00:00:00

pages

652-663

issue

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(18)31654-2

journal_volume

pub_type

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Recombinant flagellins with deletions in domains D1, D2, and D3: Characterization as novel immunoadjuvants.