Micro-Topographies Induce Epigenetic Reprogramming and Quiescence in Human Mesenchymal Stem Cells

Area of Science:

• Biomaterials Science
• Cell Biology
• Epigenetics

Background:

• Biomaterials can dictate cell and nuclear morphology.
• Nuclear shape influences chromatin organization, gene expression, and cell identity.
• Surface topography is a key factor in controlling cell phenotype.

Purpose of the Study:

• To investigate how surface topography affects nuclear morphology.
• To explore the impact of topography on histone modifications and gene expression.
• To understand the link between biophysical cues and cellular phenotype.

Main Methods:

• Advanced histone mass spectrometry
• Microarray analysis
• Long-term cell culture on micro-topographies and flat surfaces

Main Results:

• Nuclear confinement due to micro-topographies reduced histone acetylation and nucleoli abundance.
• Gene expression analysis showed reduced expression of genes involved in chromosome organization.
• Mesenchymal stem cells exhibited a quiescent phenotype with reduced proliferation and metabolism, yet maintained multipotency on micro-topographies.
• The observed effects on nuclear morphology and proliferation were reversible upon re-culturing on flat surfaces.

Conclusions:

• Surface topography significantly influences the epigenetic landscape by altering nuclear morphology and histone modifications.
• Biophysical signaling via surface topography can induce a reversible quiescent state in mesenchymal stem cells.
• These findings offer insights into how biomaterial design can control cellular behavior and phenotype.