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Modulation of antigen-specific T and B cell responses influence bacterial clearance of non-typeable Haemophilus influenzae from the lung in a rat model

journal contribution
posted on 06.12.2017, 00:00 by Jennelle Kyd, A Cripps
This study investigates antigen-specific B and T cell responses following mucosal immunization with the major outer membrane protein, P2, from non-typeable Haemophilus influenzae (NTHi) and the role of these responses in bacterial clearance following pulmonary challenge. Modification of the immunization preparation by the inclusion of sodium dodecyl sulphate (SDS) with the adjuvant, incomplete Freund’s, differentially affects the T and B cell responses to the P2 antigen. Rats received an intra-Peyer’s patch-immunization with P2 with or without the inclusion of 1% (w/v) SDS were boosted via an intrutracheal administrution of P2 alone on day 14, and challenged with live NTHi in the lungs on day 21. There were significant differences in the rate of bacterial clearance between the different P2-immunized groups and the non-immune group. The inclusion of SDS with P2 resulted in enhanced bacterial clearance. This clearance corresponded to an enhancement of P2-specific lymphocyte proliferation by CD4+ T helper cells but a decrease (reduced = 75%) in anti-P2 IgG and IgA in both serum and bronchoalveolar lavage washings. P2-specific IgM levels were not altered. IgG subclass analysis indicated that the inclusion of SDS had caused a significant reduction in IgG2a and an increase inIgG1. The data indicates that the magnitude of antibodv levels to P2 muy not be as important as T cell responses in enhancing clearance of NTHi in the lung, in vivo, and that immunization targeting enhancement of antigen-spectfic T cells may be important to inducing effective immunity to NTHi.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

14

Issue

15

Start Page

1471

End Page

1478

Number of Pages

8

eISSN

1873-2518

ISSN

0264-410X

Location

United Kingdom

Publisher

Elsevier Ltd

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of Canberra; University of Newcastle;

Era Eligible

No

Journal

Vaccine.

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