Immunophenotyping of Live Human Pluripotent Stem Cells by Flow Cytometry

Area of Science:

• Stem cell biology
• Immunology
• Regenerative Medicine

Background:

• Human pluripotent stem cells (hPSCs) hold significant promise for regenerative medicine and cell replacement therapies.
• Ensuring the quality and differentiation capacity of hPSC cultures is crucial before clinical application.
• High-throughput validation of hPSC lines is essential for their reliable use in therapeutic settings.

Purpose of the Study:

• To describe the immunophenotyping of live human embryonic stem cell (hESC) and human induced pluripotent stem cell (hiPSC) lines using flow cytometry.
• To validate the use of a specific antibody panel for identifying stem cell markers on hPSCs.
• To establish protocols applicable to both undifferentiated and differentiated hPSC progeny.

Main Methods:

• Utilized flow cytometry for high-throughput validation of hPSC lines.
• Employed a panel of antibodies targeting surface markers, including stem cell reference markers (CD90, EpCam) and prevalent/restricted markers (c-Kit, HPI-1, Integrin α6, Semaphorin-6A).
• Focused on immunophenotyping live hESC (H9) and hiPSC (KB3) lines.

Main Results:

• Successfully characterized the surfaceome of live hESC and hiPSC lines using flow cytometry.
• Identified specific antibody targets for distinguishing and validating hPSC populations.
• Demonstrated the applicability of the protocols for both undifferentiated and differentiated hPSC progeny.

Conclusions:

• Flow cytometry is an invaluable tool for the high-throughput validation and quality control of hPSC cultures.
• The described immunophenotyping protocols enable the identification and isolation of well-defined, homogeneous cell populations.
• These methods are instrumental for advancing the clinical application of hPSCs in regenerative medicine.