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Dynamic programming of CD8+ T cell trafficking after live viral immunization.

by Liu L, Fuhlbrigge RC, Karibian K, Tian T, Kupper TS

Article Abstract:

After viral infection, activated T cells are present in multiple tissues regardless of the infection route. How these cells acquire pleiotropic homing ability is unclear. By using a cutaneous vaccinia virus infection model, we demonstrate that regulation of T cell trafficking is multiphasic. Upon completion of three cell divisions, CD8+ T cells upregulated specific skin-homing molecules within draining lymph nodes (LN). By 60 hr after infection, some activated T cells reached the infected tissue, while others entered distant antigen-free LN. These latter cells continued to divide and acquire additional tissue-homing molecules in this new setting, independent of antigen presentation. After viral clearance, the initial skin-homing imprint became the predominant homing phenotype on memory cells and provided superior protection against secondary cutaneous challenge. These observations demonstrate a mechanism by which T cells provide both immediate tissue-specific immune control at the pathogen entry site and a more flexible systemic protection against pathogen dissemination.

Dynamic Programing of CD8+ T Cell Trafficking after Live Viral Immunization

By: Anonymous - Sat 10/28/2006 AM
Review: I couldn't attend this journal club so I don't know how this manuscirpt was evaluated by the group, but I have read many similar articles that have suggested that DCs from the site of antigen exposure induce tissue-of-origin homing receptors on activated T cells in the draining lmyph nodes. The studies I'm referring to were largely performed on gut-homing T lymphocyte responses. This paper examines activated T cell homing to the skin and seems reasonable.

Source: http://immunologyjournalclub.blogspot.com/200...
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