Single-Cell Transcriptomic Characterization of the Tumor Microenvironment in Prostate Cancer Bone Metastases

Area of Science:

• Oncology
• Genomics
• Cell Biology

Background:

• Prostate cancer (PCa) bone metastases are a major cause of morbidity and mortality.
• The tumor microenvironment (TME) in bone metastases drives disease progression and treatment resistance.
• Limited understanding of the cellular heterogeneity within the PCa bone TME.

Purpose of the Study:

• To comprehensively characterize cellular populations and molecular signatures of PCa bone metastases.
• To utilize single-cell RNA sequencing (scRNA-seq) data for detailed analysis.
• To identify key mechanisms driving bone metastasis progression.

Main Methods:

• Acquired scRNA-seq data from PCa bone metastasis samples via the Gene Expression Omnibus (GEO) database.
• Performed quality control, normalization, dimensionality reduction, and cell type identification using Seurat.
• Conducted differential expression, pseudotime trajectory, pathway enrichment, gene regulatory network, and cell-cell communication analyses.

Main Results:

• Identified distinct cellular populations in the bone metastatic TME: malignant epithelial cells, fibroblasts, endothelial cells, osteoblasts, osteoclasts, and immune cells.
• Revealed heterogeneous transcriptional signatures and developmental transitions between cell states via clustering and pseudotime analysis.
• Discovered key transcription factors, enriched pathways (bone remodeling, angiogenesis, immune regulation), and critical cancer-stromal cell signaling interactions.

Conclusions:

• Provided comprehensive insights into the cellular composition and molecular architecture of the PCa bone metastatic TME.
• Revealed distinct cell populations and type-specific gene signatures driving bone metastasis.
• Identified cell-cell communication networks crucial for prostate cancer bone metastasis progression.