Th17 activation by dendritic cells stimulated with gamma-irradiated Streptococcus pneumoniae.

Abstract:

:Dendritic cells (DCs) play an important role in antigen presentation, which is an essential step for the induction of antigen-specific adaptive immunity. Inactivated bacterial whole cell vaccines have been widely used to prevent many bacterial infections because they elicit good immunogenicity due to the presence of various antigens and are relatively inexpensive and easy to manufacture. Recently, gamma-irradiated whole cells of nonencapsulated Streptococcus pneumoniae were developed as a broad-spectrum and serotype-independent multivalent vaccine. In the present study, we generated gamma-irradiated S. pneumoniae (r-SP) and investigated its capacity to stimulate mouse bone marrow-derived DCs (BM-DCs) in comparison with heat-inactivated and formalin-inactivated S. pneumoniae (h-SP and f-SP, respectively). r-SP showed an attenuated binding and internalization level to BM-DCs when compared to h-SP or f-SP. r-SP weakly induced the expression of CD80, CD83, CD86, MHC class I, and PD-L2 compared with h-SP or f-SP. Furthermore, r-SP less potently induced IL-6, TNF-α, and IL-23 expression than h-SP or f-SP but more potently induced IL-1β expression than h-SP or f-SP in BM-DCs. Since Th17-mediated immune responses are known to be important for the protection against pneumococcal infections, r-SP-primed DCs were co-cultured with splenocytes or splenic CD4+ T cells. Interestingly, r-SP-sensitized BM-DCs markedly induced IL-17A+ CD4+ T cells whereas h-SP- or f-SP-sensitized BM-DCs weakly induced them. Collectively, these results suggest that r-SP could be an effective pneumococcal vaccine candidate eliciting Th17-mediated immune responses by stimulation of DCs.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Kim HY,Kim SK,Seo HS,Jeong S,Ahn KB,Yun CH,Han SH

doi

10.1016/j.molimm.2018.07.023

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

344-352

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(18)30576-5

journal_volume

101

pub_type

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