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Published on: January 7, 2019

Functional inactivation of EBV-specific T-lymphocytes in nasopharyngeal carcinoma: implications for tumor

Jiang Li1, Xue-hui Zeng, Hao-yuan Mo

  • 1State Key Laboratory of Oncology in Southern China, Cancer Center, Sun Yat-sen University, Guangzhou, China.

Plos One
|November 8, 2007
PubMed

Insights

Nasopharyngeal carcinoma (NPC) is linked to Epstein-Barr virus (EBV). This study found that while EBV-specific T-cells show defects in NPC patients, tumor-infiltrating lymphocytes are inactivated at the tumor site, hindering immune response.

Area of Science:

  • Immunology
  • Oncology
  • Virology

Background:

  • Nasopharyngeal carcinoma (NPC) is an Epstein-Barr virus (EBV)-associated cancer prevalent in Southern China.
  • Understanding the host immune response to EBV in NPC is crucial for developing effective therapies.

Purpose of the Study:

  • To investigate the phenotype and function of T-cells and tumor-infiltrating lymphocytes (TILs) in untreated NPC patients.
  • To determine if defects in EBV-specific immunity contribute to NPC development and progression.

Main Methods:

  • Analysis of circulating T-cell subsets (naïve, activated, regulatory) and NK-cells in NPC patients versus healthy donors.
  • Assessment of T-cell responses to EBV-specific epitopes (LMP1, LMP2) using HLA-A2 tetramers.
  • Expansion and functional analysis of TILs, including cytotoxicity and cytokine production (IFN-gamma).

Main Results:

  • NPC patients showed decreased circulating naïve T-cells and increased activated T-cells and NK-cells.
  • Reduced frequency of EBV-specific T-cells recognizing LMP1/LMP2 epitopes in patients.
  • TILs exhibited altered T-cell populations but lacked cytotoxic activity and IFN-gamma production upon specific stimulation, despite potential for reactivation from peripheral blood.

Conclusions:

  • EBV-specific T-cell responses are impaired in the peripheral blood of NPC patients.
  • Tumor-infiltrating lymphocytes in NPC are functionally inactivated at the tumor site, suggesting a mechanism of immune evasion.

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