Details

Autor(en) / Beteiligte

• Fourcade, Julien
• Kudela, Pavol
• Sun, Zhaojun
• Shen, Hongmei
• Land, Stephanie R.
• Lenzner, Diana
• Guillaume, Philippe
• Luescher, Immanuel F.
• Sander, Cindy
• Ferrone, Soldano
• Kirkwood, John M.
• Zarour, Hassane M.

Titel

PD-1 Is a Regulator of NY-ESO-1-Specific CD8+ T Cell Expansion in Melanoma Patients1

Ist Teil von

• The Journal of immunology (1950), 2009-05, Vol.182 (9), p.5240-5249

Erscheinungsjahr

2009

Quelle

Electronic Journals Library

Beschreibungen/Notizen

• The programmed death 1 (PD-1) receptor is a negative regulator of activated T cells and is up-regulated on exhausted virus-specific CD8 + T cells in chronically infected mice and humans. Programmed death ligand 1 (PD-L1) is expressed by multiple tumors, and its interaction with PD-1 resulted in tumor escape in experimental models. To investigate the role of PD-1 in impairing spontaneous tumor Ag-specific CD8 + T cells in melanoma patients, we have examined the effect of PD-1 expression on ex vivo detectable CD8 + T cells specific to the tumor Ag NY-ESO-1. In contrast to EBV, influenza, or Melan-A/MART-1-specific CD8 + T cells, NY-ESO-1-specific CD8 + T cells up-regulated PD-1 expression. PD-1 up-regulation on spontaneous NY-ESO-1-specific CD8 + T cells occurs along with T cell activation and is not directly associated with an inability to produce cytokines. Importantly, blockade of the PD-1/PD-L1 pathway in combination with prolonged Ag stimulation with PD-L1 + APCs or melanoma cells augmented the number of cytokine-producing, proliferating, and total NY-ESO-1-specific CD8 + T cells. Collectively, our findings support the role of PD-1 as a regulator of NY-ESO-1-specific CD8 + T cell expansion in the context of chronic Ag stimulation. They further support the use of PD-1/PD-L1 pathway blockade in cancer patients to partially restore NY-ESO-1-specific CD8 + T cell numbers and functions, increasing the likelihood of tumor regression.