title: A rapid, cost-effective method for counting human embryonic stem cell numbers as clumps.
abstract: Enumeration of human embryonic stem cell (hESC) numbers through single cell digestion can be time consuming especially in high-throughput or multi-factorial analysis containing 50+ samples. We have developed a reproducible, cost-effective method of counting hESCs in clumps circumventing the need to manually dissociate each sample to single cells. The method is based on the DNA binding capacity of propidium iodide (PI) and subsequent fluorescent signal detection. Standard curves generated for cell numbers versus PI fluorescence as single cells or clumps showed an almost identical relationship in the lines of best fit. The reproducibility of the assay was first demonstrated by seeding hESC clumps at specific cell densities ranging 0.05[#x02013]2x105 cells/well and then secondly by using the assay to count cell numbers after different growth conditions. Validation tests showed that consistent seeding densities are important in maintaining undifferentiated hESC culture and that the assay can be used to estimate relative cell numbers and growth curves with high accuracy.
authors: Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Australia.
authors: Andrew
authors: A
authors: Prowse
authors: Ernst
authors: E
authors: Wolvetang
authors: Peter
authors: P
authors: Gray
mesh_terms: D015415:Biomarkers / Q000032:analysis; D002452:Cell Count / Q000191:economics; D018929:Cell Culture Techniques / Q000379:methods*; D002460:Cell Line; D002469:Cell Separation; D004396:Coloring Agents / Q000378:metabolism*; D004247:DNA / Q000378:metabolism*; D003902:Detergents / Q000494:pharmacology; D053595:Embryonic Stem Cells / Q000166:cytology*; D010450:Endopeptidases / Q000494:pharmacology; D019084:Fluorescent Antibody Technique, Indirect; D006801:Humans; D017830:Octoxynol / Q000494:pharmacology; D011419:Propidium / Q000378:metabolism*; D015203:Reproducibility of Results; D013997:Time Factors; D014357:Trypsin / Q000494:pharmacology
chemical_list: D015415:Biomarkers; D004396:Coloring Agents; D003902:Detergents; D011419:Propidium; D017830:Octoxynol; D004247:DNA; D010450:Endopeptidases; D014357:Trypsin; C023139:dispase