A scalable solution for isolating human multipotent clinical-grade neural stem cells from ES precursors

Area of Science:

• Stem Cell Biology
• Neuroscience
• Regenerative Medicine

Background:

• Establishing clinical-grade human neural stem cells (hNSCs) from embryonic stem cells (hESCs) for safe transplantation remains a challenge.
• Current limitations hinder widespread testing of cell replacement therapies for central nervous system (CNS) injuries and diseases.

Purpose of the Study:

• To develop a reproducible and efficient method for isolating large numbers of clinical-grade multipotent hNSCs.
• To validate the safety and differentiation potential of these isolated hNSCs for potential therapeutic applications.

Main Methods:

• Manual selection of neural precursors based on colony morphology (CoMo-NSC) for in vitro isolation.
• Validation of purity and NSC properties via marker expression, lack of pluripotent markers, and in vivo spinal grafting in multiple animal models.

Main Results:

• CoMo-NSCs demonstrated consistent expression of NSC markers and lack of pluripotent markers, maintaining a stable karyotype for over 15 passages.
• In vivo grafting showed CoMo-NSCs differentiate into neurons, astrocytes, and oligodendrocytes without forming tumors in immunodeficient rats, ALS rats, and spinally injured minipigs.
• Transplanted cells formed functional neuronal and glial connections in diverse host environments, indicating favorable safety and differentiation.

Conclusions:

• Manually selected CoMo-NSCs provide a safe and expandable source of neural stem cells.
• These hNSCs are suitable for prospective human clinical trials targeting neurodegenerative disorders and CNS injuries like ALS, stroke, and spinal trauma.