Nanotopography controls cell cycle changes involved with skeletal stem cell self-renewal and multipotency

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Regenerative Medicine

Background:

• Mesenchymal stem cells, also known as skeletal stem cells (SSCs), spontaneously differentiate into fibroblasts in culture.
• This differentiation limits the expansion of multipotent SSCs, hindering their use in regenerative medicine.
• Understanding the mechanisms regulating SSC expansion and multipotency is crucial but challenging due to cell heterogeneity and lack of investigative tools.

Purpose of the Study:

• To investigate the mechanisms regulating skeletal stem cell (SSC) expansion and multipotency in culture.
• To identify tools and conditions that allow for the proliferation of SSCs while maintaining their multipotent state.
• To explore the role of cell cycle adjustments and mitogen-activated protein kinases in SSC phenotype retention.

Main Methods:

• Utilized a nanotopographical surface as a tool to culture and expand isolated bone marrow-derived SSCs.
• Analyzed cell cycle regulation in SSCs cultured on the nanotopographical surface.
• Investigated changes in mitogen-activated protein kinase (MAPK) activation associated with SSC phenotype maintenance.

Main Results:

• The nanotopographical surface facilitated SSC proliferation while preserving their multipotency.
• SSC phenotype retention in culture was linked to specific cell cycle adjustments.
• These cell cycle changes correlated with alterations in mitogen-activated protein kinase activation pathways.

Conclusions:

• Biomaterials, specifically nanotopographical surfaces, can serve as effective tools for culturing skeletal stem cells (SSCs).
• Maintaining SSC multipotency requires subtle biochemical control, involving cell cycle regulation and MAPK signaling.
• These findings provide insights into the profound impact of controlled culture environments on stem cell fate, paving the way for improved regenerative medicine strategies.