Measurement of the Adipose Stem Cells Cell Sheets Transmittance

Area of Science:

• Cell Biology
• Biotechnology
• Regenerative Medicine

Background:

• Cell sheet technology is gaining traction in cell therapy.
• Harvesting cell sheets at the optimal time is crucial but difficult due to variability in culture conditions and cell sources.
• Adipose stromal cells (ASCs) are a promising cell source for regenerative therapies.

Purpose of the Study:

• To develop and validate a device for estimating the optimal harvesting time of adipose stromal cell sheets (ASCCS).
• To assess the correlation between cell sheet transmittance and maturation.
• To confirm the identity and characteristics of ASCCS.

Main Methods:

• A novel device utilizing a light emitting diode and detector was developed to measure the transmittance of multilayer cell sheets.
• Transmittance of ASCCS was monitored every other day for up to 12 days post-seeding across different initial seeding densities.
• Cell marker expression (CD29, CD73, CD90, CD105, HLA-A, HLA-DR) was analyzed using Real-time PCR and immunostaining.

Main Results:

• The developed device successfully measured ASCCS transmittance.
• A decrease in transmittance correlated with cell sheet maturation.
• No correlation was found between cell number, thickness, and transmittance, suggesting transmittance is a specific indicator of maturation.
• ASCCS expressed key cell markers, though at lower levels than isolated ASCs.

Conclusions:

• A novel transmittance-based device enables objective estimation of ASCCS harvesting time.
• This technology can enhance the consistency and reliability of cell sheet production for therapeutic applications.
• Further research can optimize ASCCS culture and harvesting protocols using this device.