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The effects of Tim-3 activation on T-cells in gastric cancer progression

Jiangtao Yu1,2, Huanhu Zhang2, Shengbo Sun2

  • 1Department of Gastrointestinal Surgery, Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China.

Oncology Letters
|January 25, 2019
PubMed

Insights

Increased T-cell immunoglobulin mucin domain-3 (Tim-3) expression in gastric cancer correlates with tumor stage. This suggests Tim-3 signaling may impair anti-tumor T-cell responses, offering a potential therapeutic target for gastric cancer.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Gastric cancer incidence remains high, particularly in China.
  • There is a need for novel therapeutic targets in gastric cancer treatment.
  • T-cell immunoglobulin mucin domain-3 (Tim-3) is a molecule expressed on T-cells with potential roles in immune regulation.

Purpose of the Study:

  • To investigate the expression of Tim-3 in gastric cancer tissues and its correlation with tumor stage.
  • To explore the impact of Tim-3 signaling pathway activation on T-cell function and anti-tumor activity.
  • To evaluate Tim-3 as a potential therapeutic target for gastric cancer.

Main Methods:

  • Collected peripheral blood and gastric tissue samples (cancerous and paracancerous) from gastric cancer patients.
  • Quantified Tim-3 expression in T-cells using various techniques.
  • Analyzed the correlation between Tim-3 expression and gastric cancer T-staging.
  • Assessed the secretion of interferon-gamma (IFN-γ) and tumor necrosis factor-alpha (TNF-α) following Tim-3 activation.
  • Utilized a nude mouse model to evaluate the effect of Tim-3-stimulated T-cells on tumor growth.

Main Results:

  • Tim-3 expression was significantly elevated in both paracancerous and cancerous gastric tissues compared to peripheral blood.
  • Tim-3 expression was further increased in cancerous tissues relative to paracancerous tissues.
  • Tim-3 expression levels progressively increased with advanced T-staging of gastric cancer.
  • Activation of the Tim-3 signaling pathway in T-cells was associated with reduced secretion of IFN-γ and TNF-α.
  • In the mouse model, Tim-3 activation diminished the T-cells' inhibitory effect on tumor growth.
  • Increased Tim-3 expression on tumor-infiltrating T-cells correlated with impaired T-cell function.

Conclusions:

  • Elevated Tim-3 expression on T-cells is a significant finding in gastric cancer, correlating with tumor progression.
  • Tim-3 signaling pathway activation appears to suppress key anti-tumor immune responses mediated by T-cells.
  • These findings highlight the potential of targeting Tim-3 as a novel therapeutic strategy for gastric cancer.
Keywords:
T-cell immunoglobulin and mucin domain-3T-cellsflow cytometrygastric cancernude mice

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