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Effects of tumor necrosis factor alpha on dendritic cell accumulation in lymph nodes draining the immunization site and the impact on the anticryptococcal cell-mediated immune response.

Abstract：

:Cell-mediated immune (CMI) responses and tumor necrosis factor alpha (TNF-alpha) have been shown to be essential in acquired protection against Cryptococcus neoformans. Induction of a protective anticryptococcal CMI response includes increases in dendritic cells (DC) and activated CD4(+) T cells in draining lymph nodes (DLN). During the expression phase, activated CD4(+) T cells accumulate at a peripheral site where cryptococcal antigen is injected, resulting in a classical delayed-type hypersensitivity (DTH) reaction. Induction of a nonprotective anticryptococcal CMI response results in no significant increases in the numbers of DC or activated CD4(+) T cells in DLN. This study focuses on examining the role of TNF-alpha in induction of protective and nonprotective anticryptococcal CMI responses. We found that neutralization of TNF-alpha at the time of immunization with the protective immunogen (i) reduces the numbers of Langerhans cells, myeloid and lymphoid DC, and activated CD4(+) T cells in DLN and (ii) diminishes the total numbers of cells, the numbers of activated CD4(+) T cells, and amount of gamma interferon at the DTH reaction site. Although TNF-alpha neutralization during induction of the nonprotective CMI response had little effect on cellular and cytokine parameters measured, it did cause a reduction in footpad swelling when mice received challenge in the footpad. Our findings show that TNF-alpha functions during induction of the protective CMI response by influencing the accumulation of all three DC subsets into DLN. Without antigen stimulated DC in DLN, activated CD4(+) T cells are not induced and thus not available for the expression phase of the CMI response.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Bauman SK,Huffnagle GB,Murphy JW

doi

10.1128/iai.71.1.68-74.2003

keywords:

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

68-74

issue

eissn

0019-9567

issn

1098-5522

journal_volume

pub_type

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Effects of tumor necrosis factor alpha on dendritic cell accumulation in lymph nodes draining the immunization site and the impact on the anticryptococcal cell-mediated immune response.