Cells in the Polyaneuploid Cancer Cell State are Pro-Metastatic

Area of Science:

• Oncology
• Cancer Biology
• Metastasis Research

Background:

• Prostate cancer metastasis requires a deeper understanding of cancer cell adaptation.
• The Polyaneuploid Cancer Cell (PACC) state is emerging as a potential driver of metastatic competency.
• Previous in vitro studies and patient data suggest PACCs are linked to increased metastatic potential.

Purpose of the Study:

• To investigate the causative role of PACC biology in prostate cancer metastasis.
• To quantify and characterize PACC-state circulating tumor cells (CTCs) and disseminated tumor cells (DTCs) in vivo.
• To elucidate the mechanisms by which PACCs contribute to metastasis.

Main Methods:

• Development of a novel flow-cytometry method for detecting PACC-state CTCs and DTCs.
• Utilized subcutaneous, caudal artery, and intracardiac mouse models of metastasis.
• Performed in vivo colonization assays and in vitro mechanistic analyses (EMT, secretory profile).

Main Results:

• 74% of recovered CTCs and DTCs across all models were identified as being in the PACC state.
• In vivo assays demonstrated that PACC populations can reactivate proliferative capacity after dormancy at metastatic sites.
• In vitro analyses revealed PACC-specific partial Epithelial-to-Mesenchymal-Transition (EMT) phenotype and a pro-metastatic secretory profile.

Conclusions:

• The PACC state is mechanistically linked to prostate cancer metastasis.
• PACCs possess the ability to survive dormancy and regain proliferative capacity at secondary sites.
• These findings highlight PACCs as a critical factor in prostate cancer metastatic progression.