Abstract:
BACKGROUND:Current efforts to direct differentiation of human embryonic stem cells (hESC) into a particular cell lineage usually lead to a heterogeneous cell population with only a fraction of the desired cell type present. We show the generation of an essentially pure population of human cardiomyocytes from hESC using lineage selection. METHODS:A construct comprising the murine alpha-myosin heavy chain (alpha-MHC) promoter driving the neomycin-resistance gene was introduced into hES3 cells to generate stable transgenic lines. Transgenic hESC lines were differentiated into cardiomyocytes and subjected to G418 selection. Both G418-selected and non-selected cardiomyocytes were characterized by immunocytochemistry and reverse transcriptase-polymerase chain reaction (RT-PCR) analysis. The teratoma-forming potential of differentiated cells was assessed by injection of about 2 million cells into the hind limb muscle of SCID mice. Results After cardiac differentiation and antibiotic selection in a suspension culture process, more than 99% of the transgenic cells showed immunoreactivity to alpha-MHC and alpha-actinin; this enrichment efficiency was observed for independent transgenic cell lines. Quantitative RT-PCR analysis revealed high levels of enrichment for cardiac-specific messages in the selected population. Importantly, injection of selected cells into six SCID mice resulted in no apparent teratoma formation, in contrast to differentiated but non-selected controls. DISCUSSION:Our results represent a significant step toward scalable production of pure human cardiomyocytes from stable, expandable hESC lines that will facilitate the development of cell therapies, safety pharmacology and drug discovery.
journal_name
Cytotherapyjournal_title
Cytotherapyauthors
Xu XQ,Zweigerdt R,Soo SY,Ngoh ZX,Tham SC,Wang ST,Graichen R,Davidson B,Colman A,Sun Wdoi
10.1080/14653240802105307subject
Has Abstractpub_date
2008-01-01 00:00:00pages
376-89issue
4eissn
1465-3249issn
1477-2566pii
793263310journal_volume
10pub_type
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