In:
The Journal of Immunology, The American Association of Immunologists, Vol. 182, No. 1_Supplement ( 2009-04-01), p. 45.9-45.9
Kurzfassung:
Developing an in-depth understanding of the factors that regulate the induction, quality, and longevity of T cell responses is essential for devising rational strategies to promote anti-pathogen immunity. Cellular immune responses to many persistent viral infections are associated with the development of T cell exhaustion, which is characterized by the inability to produce anti-viral cytokines and proliferate. We have used IFN-γ-Thy1.1 cytokine reporter mice to dissect the initial activation events and functional traits of CD8 T cells as they respond following acute or persistent lymphocytic choriomeningitis virus (LCMV) infections. We show that a positive correlation exists between the expression of the Thy1.1 reporter molecule and IFN-γ production. Significantly, we show that expression of the Thy1.1 IFN-γ reporter molecule is elevated during the early stages of infections associated with the subsequent development of T cell exhaustion but is not as markedly upregulated following infections that become well controlled. This parallels the expression of PD-1, which is known to be upregulated on exhausted cells. Collectively, these data indicate that exhausted T cells, which are ineffective at eradicating persisting antigens, are derived from populations of cells that are initially hyperactivated. Thus, the blockade of this hyperactivation may represent a novel therapeutic approach to enhance cellular immunity against intracellular pathogens.
Materialart:
Online-Ressource
ISSN:
0022-1767
,
1550-6606
DOI:
10.4049/jimmunol.182.Supp.45.9
Sprache:
Englisch
Verlag:
The American Association of Immunologists
Publikationsdatum:
2009
ZDB Id:
1475085-5
