Reduced T Cell Priming in Microbially Experienced "Dirty" Mice Results from Limited IL-27 Production by XCR1+ Dendritic Cells.

Reduced T Cell Priming in Microbially Experienced "Dirty" Mice Results from Limited IL-27 Production by XCR1+ Dendritic Cells.
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DOI:
10.4049/jimmunol.2200324
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发表时间:
2022-12-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Griffith TS
Griffith TS
中科院分区:
其他
文献类型:
--
作者:
Sjaastad FV;Huggins MA;Lucas ED;Skon-Hegg C;Swanson W;Martin MD;Salgado OC;Xu J;Pierson M;Dileepan T;Kucaba TA;Hamilton SE;Griffith TS

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Successful vaccination strategies offer the potential for lifelong immunity against infectious diseases and cancer. There has been increased attention regarding the limited translation of some preclinical findings generated using specific pathogen-free (SPF) laboratory mice to humans. One potential reason for the difference between preclinical and clinical findings lies in maturation status of the immune system at the time of challenge. In this study, we used a ‘dirty’ mouse model, where SPF laboratory mice were cohoused with pet store mice to permit microbe transfer and immune system maturation, to investigate the priming of a naïve T cell response after vaccination with a peptide subunit mixed with polyI:C and agonistic anti-CD40 mAb. While this vaccination platform induced robust antitumor immunity in SPF mice, it failed to do so in microbially-experienced cohoused (CoH) mice. Subsequent investigation revealed that despite similar numbers of Ag-specific naïve CD4 and CD8 T cell precursors, the expansion, differentiation, and recall responses of these CD4 and CD8 T cell populations in CoH mice were significantly reduced compared to SPF mice after vaccination. Evaluation of the dendritic cell compartment revealed reduced IL-27p28 expression by XCR1+ DC from CoH mice after vaccination, correlating with reduced T cell expansion. Importantly, administration of recombinant IL-27:EBI3 complex to CoH mice shortly after vaccination significantly boosted Ag-specific CD8 and CD4 T cell expansion, further implicating the defect to be T cell extrinsic. Collectively, our data show the potential limitation of exclusive use of SPF mice when testing vaccine efficacy.
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