The bone microenvironment invigorates metastatic seeds for further dissemination

Area of Science:

• Oncology
• Cancer Biology
• Epigenetics

Background:

• Metastasis is typically viewed as the final stage of tumor progression.
• Genomic studies indicate that metastases can arise from the further spread of existing metastatic sites.
• Pre-clinical models and mechanistic understanding of this phenomenon are limited.

Purpose of the Study:

• To investigate the role of the bone microenvironment in facilitating further cancer metastasis.
• To elucidate the underlying epigenetic mechanisms driving multi-organ secondary metastases.
• To identify key molecular players involved in metastasis evolution.

Main Methods:

• Utilized parabiosis and an evolving barcode system for pre-clinical modeling.
• Analyzed epigenetic reprogramming and stem cell-like properties in cancer cells from bone lesions.
• Assessed the impact of EZH2 activity on cancer cell stemness and metastatic capacity.

Main Results:

• The bone microenvironment promotes further metastasis of breast and prostate cancer cells.
• Epigenetic reprogramming confers stem cell-like properties on disseminated cancer cells.
• Enhanced EZH2 activity is crucial for increased stemness and metastatic potential.
• Mechanisms identified are independent of clonal selection.

Conclusions:

• The bone microenvironment plays a critical, previously unappreciated role in metastasis evolution.
• Epigenomic reprogramming within the bone microenvironment drives terminal-stage, multi-organ metastases.
• Targeting EZH2 may offer therapeutic strategies for advanced metastatic disease.