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The absence of lymphoid CD8+ dendritic cell maturation in L-selectin-/- respiratory compartment attenuates antiviral immunity. | LitMetric

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Article Abstract

Intratracheal instillation of L-selectin-deficient (L-Sel(-/-)) mice with an adenovirus 2 (Ad2) vector resulted in the lack of respiratory Ad2- or beta-galactosidase-specific CTLs with concomitant long-lived beta-galactosidase transgene expression in the lungs. The absence of Ag-specific CTLs was attributed to a deficiency in lymphoid CD11c(+)CD8(+) dendritic cells (DCs) in the lower respiratory lymph nodes (LRLNs). To enable L-Sel(-/-) CTL activity, cell-sorted L-Sel(-/-)CD8(+) T cells were cocultured with cell-sorted L-Sel(+/+)CD8(+) or CD8(-) DCs or L-Sel(-/-)CD8(-) DCs. Only the CD8(+) DCs restored CTL activity; L-Sel(-/-)CD8(-) DCs failed to support L-Sel(+/+) CTLs because these remained immature, lacking the ability to express costimulatory molecules CD40, CD80, or CD86. Although no lung CD8(+) DCs were detected, the DC environment remained suppressive in L-Sel(-/-) mice evident by the lack of CTL responses following adenoviral challenge with OVA in recipient L-Sel(-/-) adoptively transferred with OT-1 CD8(+) T cells. To assess whether the L-Sel(-/-)CD8(-) DCs could be induced into maturity, microbial stimulation studies were performed showing the failure of L-Sel(-/-) LRLN to make matured DCs. When L-Sel(-/-) mice were subjected in vivo to microbial activation before Ad2 vector dosing, CTL activity was restored stimulating the renewed presence of LRLN CD8(+) DCs in L-Sel(-/-) mice. These studies show that impairment of L-Sel(-/-) DC maturation results in insufficient mature DCs that require microbial activation to restore increases in respiratory CD8(+) DCs to support CTL responses.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2601724PMC
http://dx.doi.org/10.4049/jimmunol.181.2.1345DOI Listing

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