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© Research
Publication : Blood

TLR3 essentially promotes protective class I-restricted memory CD8⁺ T-cell responses to Aspergillus fumigatus in hematopoietic transplanted patients

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Blood - 06 Dec 2011

Carvalho A, De Luca A, Bozza S, Cunha C, D'Angelo C, Moretti S, Perruccio K, Iannitti RG, Fallarino F, Pierini A, Latgé JP, Velardi A, Aversa F, Romani L

Link to Pubmed [PMID] – 22147891

Blood 2012 Jan;119(4):967-77

Aspergillus fumigatus is a model fungal pathogen and a common cause of severe infections and diseases. CD8⁺ T cells are present in the human and murine T-cell repertoire to the fungus. However, CD8⁺ T-cell function in infection and the molecular mechanisms that control their priming and differentiation into effector and memory cells in vivo remain elusive. In the present study, we report that both CD4⁺ and CD8⁺ T cells mediate protective memory responses to the fungus contingent on the nature of the fungal vaccine. Mechanistically, class I MHC-restricted, CD8⁺ memory T cells were activated through TLR3 sensing of fungal RNA by cross-presenting dendritic cells. Genetic deficiency of TLR3 was associated with susceptibility to aspergillosis and concomitant failure to activate memory-protective CD8⁺ T cells both in mice and in patients receiving stem-cell transplantations. Therefore, TLR3 essentially promotes antifungal memory CD8⁺ T-cell responses and its deficiency is a novel susceptibility factor for aspergillosis in high-risk patients.

http://www.ncbi.nlm.nih.gov/pubmed/22147891