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2011 ; 186
(4
): 2117-26
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Hapten application to the skin induces an inflammatory program directing
hapten-primed effector CD8 T cell interaction with hapten-presenting endothelial
cells
#MMPMID21239709
J Immunol
2011[Feb]; 186
(4
): 2117-26
PMID21239709
show ga
Contact hypersensitivity is a CD8 T cell-mediated response to hapten
sensitization and challenge of the skin. Effector CD8 T cell recruitment into the
skin parenchyma to elicit the response to hapten challenge requires prior
CXCL1/KC-directed neutrophil infiltration within 3-6 h after challenge and is
dependent on IFN-? and IL-17 produced by the hapten-primed CD8 T cells.
Mechanisms directing hapten-primed CD8 T cell localization and activation in the
Ag challenge site to induce this early CXCL1 production in response to
2,4-dinitrofluorobenzene were investigated. Both TNF-? and IL-17, but not IFN-?,
mRNA was detectable within 1 h of hapten challenge of sensitized mice and
increased thereafter. Expression of ICAM-1 was observed by 1 h after challenge of
sensitized and nonsensitized mice and was dependent on TNF-?. The induction of
IL-17, IFN-?, and CXCL1 in the challenge site was not observed when ICAM-1 was
absent or neutralized by specific Ab. During the elicitation of the contact
hypersensitivity response, endothelial cells expressed ICAM-1 and produced CXCL1
suggesting this as the site of CD8 T cell localization and activation.
Endothelial cells isolated from challenged skin of naive and sensitized mice had
acquired the hapten and the ability to activate hapten-primed CD8 T cell cytokine
production. These results indicate that hapten application to the skin of
sensitized animals initiates an inflammatory response promoting hapten-primed CD8
T cell localization to the challenge site through TNF-?-induced ICAM-1 expression
and CD8 T cell activation to produce IFN-? and IL-17 through endothelial cell
presentation of hapten.