Comprehensive transcriptomic analysis of prostate cancer lung metastases

Area of Science:

• Oncology
• Molecular Biology
• Genomics

Background:

• Metastatic prostate cancer (mPCa) poses a significant mortality risk.
• Understanding the molecular drivers of mPCa progression, particularly in visceral and skeletal sites, is crucial.
• The tumor microenvironment significantly influences metastatic spread and disease outcomes.

Purpose of the Study:

• To conduct a comprehensive transcriptomic analysis of prostate cancer (PCa) lung metastases.
• To identify differentially expressed genes in PCa lung metastases compared to primary PCa and bone metastases.
• To elucidate the role of the microenvironment in PCa lung metastasis.

Main Methods:

• Digital gene expression analysis using the NanoString nCounter system on formalin-fixed, paraffin-embedded (FFPE) tissues from PCa lung metastases (n=24).
• Comparative analysis with gene expression data from primary PCa and PCa bone metastases.
• Bioinformatic analysis utilizing publicly available tools.

Main Results:

• 209 genes were upregulated and 100 genes were downregulated in PCa lung metastases compared to bone metastases.
• Upregulated genes in lung metastases were associated with immunogenic responses (e.g., HLA-DPB1, PTPRC, CCL5).
• Downregulated genes were linked to epithelial-mesenchymal transition (EMT) (e.g., FOXC2, TWIST1). The CXCR3/CXCL10 axis was also implicated.

Conclusions:

• PCa lung metastases exhibit a distinct transcriptomic profile compared to bone metastases.
• The upregulation of immune response genes suggests a more immunogenic phenotype in lung metastases.
• This immunogenic shift may enhance susceptibility to immunotherapeutic interventions in mPCa patients.