Human Prostate Tissue-derived Extracellular Matrix as a Model of Prostate Microenvironment

Area of Science:

• Oncology
• Biotechnology
• Cancer Research

Background:

• Prostate cancer (PPCa) exhibits significant heterogeneity, complicating accurate prognosis.
• Current predictive tools often fail to distinguish indolent from aggressive PPCa phenotypes.
• There is a critical need for reliable methods to assess PPCa cell invasiveness.

Purpose of the Study:

• To develop a novel ex vivo/in vitro model for evaluating the invasive potential of PPCa cells (PPCaC).
• To establish a system capable of estimating the invasive phenotype of PPCa cells.

Main Methods:

• Utilized decellularized prostate extracellular matrix (ECM) from radical prostatectomy specimens.
• Co-cultured PPCaC with the prepared ECM to assess invasion.
• Quantified invasion by counting infiltrated cells and performed statistical comparisons using the Mann-Whitney test.

Main Results:

• The developed ECM was cell-free, DNA-free, and preserved its 3D structure and stromal proteins.
• The model demonstrated reliability, with cell lines exhibiting expected behaviors (re-epithelialization or invasion).
• PPCaC invasion correlated with tumor stage and biochemical recurrence, and the model identified distinct invasive phenotypes even within similar Gleason grades and stages.

Conclusions:

• An ex vivo/in vitro model was successfully developed to replicate the PPCa microenvironment.
• This model can accurately identify the inherent invasive behavior of PPCaC.
• The system holds potential for identifying new biomarkers to predict disease progression and improve patient outcomes.