Extended lifespan and improved genome stability in HepaRG-derived cell lines through reprogramming by high-density...

Area of Science:

• Cell Biology
• Cancer Research
• Biophysics

Background:

• Cancer cell fate is influenced by mechanical cues from their microenvironment.
• HepaRG liver carcinoma cells exhibit transdifferentiation, but mechanisms are unclear.

Purpose of the Study:

• To investigate the impact of physical forces, mimicking the tumor microenvironment, on HepaRG cell reprogramming and differentiation.
• To explore the role of mechanical stress in genomic stability and cancer progression.

Main Methods:

• Seeding HepaRG cells at very high density to induce spatial confinement and compressive stress.
• Applying physical stress with and without corticoids to induce reprogramming and redifferentiation.
• Assessing genomic stability, DNA repair efficiency, and telomerase activity.

Main Results:

• High-density seeding induced reprogramming of HepaRG cells into stable, stem-like cells.
• Physical stress, particularly compressive stress from high-density seeding, improved chromosome quality and genomic stability.
• Cells demonstrated restored telomerase activity and enhanced DNA repair, enabling them to bypass the Hayflick limit twice.
• Redifferentiation into HepaRG-like cells was achieved using corticoids, indicating retained cellular memory.

Conclusions:

• External physical stress, especially compressive stress, can reprogram cancer cells and enhance genomic stability.
• This approach offers a novel method for generating cell lines and potentially improving cancer prognosis.
• The findings highlight the importance of the tumor microenvironment's mechanical properties in cancer cell behavior.