Fluorescence-activated single cell sorting of human embryonic stem cells.

Area of Science:

• Stem Cell Biology
• Regenerative Medicine
• Developmental Biology

Background:

• Human embryonic stem cells (hESCs) are crucial for regenerative medicine, toxicity testing, and developmental studies.
• Current limitations in hESC isolation and handling hinder their therapeutic and research applications.
• Automated cell sorting offers potential for isolating homogenous hESC populations and removing tumor-forming cells.

Purpose of the Study:

• To develop a semi-automated method for single-cell sorting of hESCs.
• To improve the clonal recovery and yield of hESCs after sorting and plating.
• To enable efficient isolation of differentiated and undifferentiated hESC populations.

Main Methods:

• Utilized an ES-specific promoter-transgene construct for hESC labeling.
• Employed automated Fluorescence-Activated Cell Sorting (FACS) for single-cell isolation and plating.
• Compared clonal recovery under different oxygen conditions (2% vs. 21%).

Main Results:

• Achieved successful semi-automated single-cell sorting of hESCs.
• Demonstrated a fourfold increase in clonal recovery at physiologic oxygen (2%) compared to room oxygen (21%; p < 0.01).
• Overcame poor recovery issues associated with single-cell disaggregation and low-density plating.

Conclusions:

• The developed automated protocol significantly enhances hESC recovery and throughput.
• This method facilitates the realization of hESC-based strategies in regenerative medicine and research.
• The protocol addresses key challenges in handling sensitive hESC populations for therapeutic and basic science applications.