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Tuma, R.A. et al.

Tuma, Giannino, Guirnalda, Leiner, Pamer,

Rescue of CD8 T cell-mediated antimicrobial immunity with a nonspecific inflammatory stimulus.

Reconstitution of protective immunity by adoptive transfer of pathogen-specific T cells has been successful in patients with compromised cellular immunity. The in vivo effectiveness of in vitro-expanded CD8 CTLs is variable, however. For example, adoptively transferred Listeria monocytogenes-specific CD8 CTLs only confer protective immunity if challenge infection occurs within 48 hours of T cell infusion. Herein we show that transferred CTLs persist in lymphoid compartments for many weeks, but that their response to bacterial challenge decreases during the first week following transfer. While T cells transferred less than 48 hours before infection proliferate, those transferred 7 days before infection die. Remarkably, treatment of mice with anti-CD40 at the time of T cell infusion reprograms transferred T cells, allowing them to proliferate and confer protective immunity upon bacterial challenge 7 days later. Our study demonstrates, for the first time to our knowledge that CD40- mediated stimuli can influence CD8 T cell activation independent of concurrent antigen exposure. The ability to modulate long-term responsiveness of CD8 T cells with a transient, nonspecific inflammatory stimulus has importation implications for adoptive immunotherapy.[1]

References

Rescue of CD8 T cell-mediated antimicrobial immunity with a nonspecific inflammatory stimulus. Tuma, R.A., Giannino, R., Guirnalda, P., Leiner, I., Pamer, E.G. J. Clin. Invest. (2002) [Pubmed]

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