Engineering Neural Tissue from Human Pluripotent Stem Cells Using Novel Small Molecule Releasing Microspheres

Area of Science:

• Biotechnology
• Stem Cell Biology
• Tissue Engineering

Background:

• Human-induced pluripotent stem cells (hiPSCs) offer potential for neural tissue engineering.
• Controlled release of small molecules is crucial for directing stem cell differentiation.
• Developing functional motor neurons is essential for regenerative medicine.

Purpose of the Study:

• To develop a novel technique for engineering motor neurons from hiPSCs.
• To create and characterize purmorphamine (puro)-releasing poly ε-caprolactone (PCL) microspheres.
• To evaluate the efficacy of combining puro and retinoic acid (RA) microspheres in directing hiPSC differentiation into motor neurons.

Main Methods:

• Encapsulation of purmorphamine (puro) into poly ε-caprolactone (PCL) microspheres via an oil-in-water emulsion method.
• Incorporation of puro and retinoic acid (RA) microspheres into hiPSC aggregates.
• Assessment of neural differentiation using markers such as β-tubulin III (βT-III), Olig2, HB9, and ChaT at various time points.

Main Results:

• Successfully encapsulated puro into PCL microspheres with high efficiency (84% ± 2.12%).
• Puro microspheres demonstrated controlled release over 46 days (91% ± 1.7%).
• Combined puro and RA microspheres significantly promoted hiPSC differentiation into neural tissues expressing motor neuron markers (HB9 and ChaT).

Conclusions:

• A novel method for engineering motor neurons using hiPSCs and controlled small molecule release microspheres was established.
• The engineered neural tissues show potential for applications in regenerative medicine, including spinal cord injury (SCI) treatment.
• This approach is also suitable for disease modeling and drug screening purposes.