In Vitro Wound Simulation: A High-Throughput Device for Scratch Assays.

Area of Science:

• Neuroscience
• Biomedical Engineering
• Cell Biology

Background:

• Traumatic central nervous system (CNS) injuries cause cell death and blood-brain barrier (BBB) disruption, hindering functional recovery.
• Current in vitro methods for studying CNS wound healing, like scratch assays, lack standardization and high throughput.
• Developing reliable assays is crucial for screening therapies that promote CNS regeneration over scarring.

Purpose of the Study:

• To design and validate a novel, inexpensive, and user-friendly rig for standardized high-throughput in vitro scratch assays.
• To improve the consistency of scratch width, straightness, and cell removal in simulated CNS wounds.
• To facilitate the mechanistic study of cell migration and proliferation in CNS repair models.

Main Methods:

• A simple scratch assay rig was designed for rapid assembly (<30 minutes) and low cost (<$110).
• The rig produces uniform, straight scratches (tortuosity < 1.1) with tunable widths (730-1100μm) on 24-well plates.
• The device was tested on in vitro cultures of neural progenitor cells (NPCs) to assess wound closure rates.

Main Results:

• The rig consistently created uniform and straight scratches, fully removing damaged cells.
• The device enabled high-throughput screening by accommodating multiple experimental conditions or replicates.
• Application on NPCs showed the assay could detect differences in wound closure rates across various media conditions.

Conclusions:

• The developed scratch assay rig offers a standardized, efficient, and cost-effective method for in vitro wound healing studies.
• This tool can significantly improve the screening of molecular approaches for CNS injury repair.
• Implementation of this rig will enhance the reliability and throughput of research investigating glial responses and fibrotic scarring in CNS repair.