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Orthotopic Transplantation of Syngeneic Lung Adenocarcinoma Cells to Study PD-L1 Expression
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Marked Global DNA Hypomethylation Is Associated with Constitutive PD-L1 Expression in Melanoma

Aniruddha Chatterjee1, Euan J Rodger1, Antonio Ahn2

  • 1Department of Pathology, Dunedin School of Medicine, University of Otago, 270 Great King Street, Dunedin 9054, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, Level 2, 3A Symonds Street, Auckland, New Zealand.

Iscience
|September 22, 2018
PubMed

Insights

Global DNA methylation loss correlates with constitutive PD-L1 expression in melanoma, potentially enabling immune evasion. This finding suggests combining epigenetic therapy with immunotherapy may improve cancer treatment outcomes.

Area of Science:

  • Cancer Biology
  • Epigenetics
  • Immunology

Background:

  • Immune checkpoint protein programmed death-ligand 1 (PD-L1) constitutively expressed in cancer inhibits anti-tumor immune responses.
  • Regulatory factors governing PD-L1 expression remain largely unknown.

Purpose of the Study:

  • To investigate the role of global DNA methylation in regulating PD-L1 expression in melanoma.
  • To explore the relationship between DNA methylation, PD-L1 expression, and anti-tumor immunity in melanoma.

Main Methods:

  • Integrated genomic analysis of melanoma cell lines and The Cancer Genome Atlas (TCGA) data.
  • Analysis of DNA methylation patterns, transcriptomic profiles, and PD-L1 expression levels.
  • Assessment of epigenetic regulators (e.g., DNMT3A) and viral mimicry gene expression.

Main Results:

  • Loss of global DNA methylation, especially in intergenic and repeat regions, is linked to constitutive PD-L1 expression in melanoma.
  • Decitabine treatment, inhibiting DNA methylation, increased PD-L1 expression in melanoma cells.
  • Viral mimicry and immune response genes were upregulated in PD-L1-positive melanomas compared to PD-L1-negative ones.

Conclusions:

  • Global DNA methylation status significantly influences PD-L1 expression in melanoma, impacting immune evasion.
  • Findings highlight the potential of combining epigenetic therapies with immunotherapies for melanoma treatment.
Keywords:
CancerGeneticsGenomicsTranscriptomics

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