Control of cell nucleus shapes via micropillar patterns

Area of Science:

• Biomaterials Science
• Cell Biology
• Tissue Engineering

Background:

• Controlling cell morphology is crucial for understanding cell function and guiding tissue regeneration.
• Existing methods for manipulating cell shape often lack precision or impact cell viability.
• Investigating the relationship between substrate microtopography and nuclear architecture is an emerging area.

Purpose of the Study:

• To develop and demonstrate a material technique for precisely controlling cell nucleus shapes.
• To investigate the impact of substrate microtopography on the nuclear deformation of bone marrow stromal cells (BMSCs).
• To assess the viability, proliferation, and differentiation potential of BMSCs with deformed nuclei.

Main Methods:

• Fabrication of poly(D,L-lactide-co-glycolide) (PLGA) micropillars and micropits with varying dimensions.
• Culture of BMSCs on these micro-patterned substrates to observe cell adhesion and nuclear morphology.
• Analysis of nucleus deformation using microscopy.
• Assessment of BMSC proliferation and differentiation potential via standard cell assays.

Main Results:

• Significant self-deformation of BMSC nuclei was observed on PLGA micropillars of sufficient height.
• BMSCs maintained their proliferation and differentiation capabilities despite substantial nuclear deformation.
• Demonstrated precise regulation of BMSC nucleus shapes, achieving non-spherical morphologies like square, cross, and dumbbell.
• Microtopography design was shown to be an effective strategy for dictating nuclear shape.

Conclusions:

• Substrate microtopography is a powerful tool for controlling cell nucleus morphology.
• PLGA-based micro-patterned substrates enable precise manipulation of nuclear shape without impairing cell function.
• This technique offers new possibilities for studying nucleus-cytoskeleton interactions and for applications in regenerative medicine.