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IL-10 production in non-small cell lung carcinoma patients is regulated by ERK, P38 and COX-2

Swati Patel1, Shamal Vetale, Pradeep Teli

  • 1Chiplunkar Lab, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Navi Mumbai, India.

Journal of Cellular and Molecular Medicine
|April 22, 2011
PubMed

Insights

Non-small cell lung carcinoma (NSCLC) impairs immune function by increasing immunosuppressive IL-10 via COX-2 and PGE2. Targeting these pathways restores T cell function and cytokine balance in NSCLC patients.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Immune dysfunction is a key feature of non-small cell lung carcinoma (NSCLC).
  • The precise mechanisms linking cyclooxygenase-2 (COX-2) and prostaglandin E2 (PGE2) to the immunosuppressive cytokine interleukin-10 (IL-10) in NSCLC remain unclear.
  • Understanding these pathways is crucial for developing immunotherapies.

Purpose of the Study:

  • To investigate the role of T cell signaling intermediates, cytokines (IL-10, interferon-gamma [IFN-γ]), and their transcription factors (T-bet, GATA-3) in COX-2-mediated lymphocyte dysfunction in NSCLC.
  • To elucidate the involvement of p38 and extracellular signal-regulated kinase (ERK) mitogen-activated protein kinase (MAPK) pathways in regulating IL-10/IFN-γ balance in NSCLC.
  • To assess the therapeutic potential of targeting COX-2 and MAPK pathways.

Main Methods:

  • Lymphocyte proliferation assessed by thymidine incorporation assay.
  • Intracellular calcium and reactive oxygen species measured by flow cytometry.
  • Cytokine levels (IL-10, IFN-γ) quantified by ELISA.
  • Transcription factor regulation (T-bet, GATA-3) analyzed by Western blotting, immunoprecipitation, and electrophoretic mobility shift assay (EMSA).
  • MAPK pathway activation (p38, ERK, JNK) evaluated by Western blotting.
  • Inhibition studies using selective COX-2 and MAPK pathway inhibitors.

Main Results:

  • NSCLC patients exhibited reduced lymphocyte proliferation, decreased intracellular calcium, and increased reactive oxygen species compared to healthy individuals.
  • Elevated IL-10 and PGE2 levels with reduced IFN-γ production were observed in NSCLC patients.
  • Defective regulation of T-bet and GATA-3 transcription factors was evident.
  • Overexpression of p-p38, p-ERK, and COX-2, with diminished p-JNK, was noted.
  • p38 and ERK MAPK pathways, in conjunction with COX-2, were found to differentially regulate IL-10/IFN-γ levels.
  • Inhibition of these pathways restored lymphocyte proliferation and IFN-γ production while decreasing IL-10 levels.
  • Selective COX-2 inhibition (rofecoxib) modulated cytokine balance and transcription factor regulation.

Conclusions:

  • Lung tumor-derived PGE2, acting through ERK, p38, and COX-2 pathways, drives high IL-10 production in NSCLC.
  • Targeting the ERK, p38, and COX-2 pathways can reverse immune suppression in NSCLC.
  • Selective COX-2 inhibition offers a potential strategy to restore immune balance by modulating T-bet and GATA-3 transcription factors in NSCLC.

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