Spinal cord tissue engineering using human primary neural progenitor cells and astrocytes.

Area of Science:

• Regenerative Medicine
• Neuroscience
• Biomaterials Science

Background:

• Spinal cord injury (SCI) presents significant challenges for neural repair.
• Neural progenitor cell (NPC) transplantation shows promise but faces hurdles in cell survival, maturation, and integration.
• Developing effective strategies for cell survival and functional integration is crucial for SCI treatment.

Purpose of the Study:

• To engineer a novel, centimeter-scale human spinal cord neural tissue (hscNT) construct for SCI repair.
• To investigate the role of human spinal cord astrocytes (hscAS) in promoting neural progenitor cell (hscNPC) survival and organization on a collagen scaffold.
• To evaluate the therapeutic potential of the hscNT construct in a rat SCI model.

Main Methods:

• Fabrication of a centimeter-scale hscNT construct using hscNPCs and hscAS on a linearly ordered collagen scaffold (LOCS).
• Assessment of hscAS effects on hscNPC adhesion, survival, and neurite outgrowth.
• Transplantation of hscNT constructs into rats with SCI to evaluate biocompatibility, tissue regeneration, and functional recovery.
• Analysis of inflammatory response, glial scar formation, neural and vascular regeneration, and neural circuit reconstruction.

Main Results:

• The hscAS significantly promoted hscNPC adhesion, survival, and neurite outgrowth on the LOCS, forming a linearly ordered spinal cord-like structure.
• Transplanted hscNT constructs created a favorable microenvironment by reducing inflammation and glial scar formation.
• The constructs facilitated significant neural and vascular regeneration, promoting neural circuit reconstruction and motor functional recovery in SCI rats.

Conclusions:

• Engineered human spinal cord implants, incorporating astrocytes and neurons on axon guidance scaffolds, demonstrate significant potential for SCI treatment.
• The hscNT construct provides a promising platform for enhancing cell survival, promoting regeneration, and restoring function after spinal cord injury.
• This approach highlights the synergistic effects of astrocytes and organized scaffolds in advancing neural tissue engineering for SCI therapeutics.