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Increased PD-1 expression on CD4+ and CD8+ T cells is involved in immune evasion in gastric cancer

Hiroaki Saito1, Hirohiko Kuroda, Tomoyuki Matsunaga

  • 1Division of Surgical Oncology, Department of Surgery, Tottori University School of Medicine, Yonago, Japan. sai10@med.tottori-u.ac.jp

Journal of Surgical Oncology
|November 7, 2012
PubMed
Abstract

Insights

Increased programmed death-1 (PD-1) on T cells correlates with immune evasion in gastric cancer. This suggests PD-1 upregulation on CD4+ and CD8+ T cells contributes to the disease.

Area of Science:

  • Immunology
  • Oncology

Background:

  • Co-signaling molecules are crucial for T cell function.
  • Programmed death-1 (PD-1) is an inhibitory receptor implicated in cancer immune evasion.
  • Elevated PD-1 on T cells is observed in various cancers.

Purpose of the Study:

  • To investigate PD-1 expression on T cells in gastric cancer patients.
  • To determine the relationship between PD-1 expression and immune evasion in gastric cancer.

Main Methods:

  • Analyzed PD-1 expression on CD4+ and CD8+ T cells using multicolor flow cytometry.
  • Samples included peripheral blood mononuclear cells (PBMC), normal gastric mucosa, and gastric cancer tissue.
  • Compared PD-1 expression between gastric cancer patients and healthy controls.

Main Results:

  • PD-1 expression was significantly higher on CD4+ and CD8+ T cells in gastric cancer patients compared to controls.
  • Elevated PD-1 levels correlated with disease progression.
  • Gastric cancer tissue showed higher PD-1 expression than normal mucosa and PBMC.
  • PD-1 positive T cells produced less Interferon-gamma (IFN-γ) than PD-1 negative T cells.

Conclusions:

  • Upregulation of PD-1 on both CD4+ and CD8+ T cells may contribute to immune evasion in gastric cancer.
  • PD-1 expression serves as a potential biomarker for immune evasion in gastric cancer.

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