title: Cardiomyocyte enrichment from human embryonic stem cell cultures by selection of ALCAM surface expression.
abstract: OBJECTIVE
  The production of a homogenous population of human cardiomyocytes that can be expanded in vitro may facilitate development of replacement tissue lost as a result of cardiac disease and injury.
  
  
  METHODS
  We evaluated the utility of activated leukocyte cell-adhesion molecule, CD166 (ALCAM) expression as a marker for isolating cardiomyocytes from differentiating cultures of human embryonic stem cells (hESCs). Using RT-qPCR, immunohistochemistry and DNA methylation studies, we evaluated the developmental age of hESC-derived cardiomyocytes.
  
  
  CONCLUSIONS
  We demonstrate that cardiomyocytes derived from hESC cultures express ALCAM and that this surface antigen can be used to select a population of differentiated cells that are enriched for cardiomyocytes. Expression of contractile proteins and ion channels, and DNA methylation patterns, suggest that ALCAM-enriched cardiomyocytes have an embryonic phenotype. Selected cardiomyocyte populations survive sorting, adhere to collagen-coated tissue culture plastic and proliferate in short-term culture. Long-term in vitro survival of cardiomyocytes was achieved by culturing cells in 3D aggregates.
authors.affiliation: Lonza Walkersville, Inc., 8830 Biggs Ford Road, Walkersville, MD 21793, USA. william.rust@lonza.com
authors.forename: William
authors.initials: W
authors.lastname: Rust
authors.forename: Thavamalar
authors.initials: T
authors.lastname: Balakrishnan
authors.forename: Robert
authors.initials: R
authors.lastname: Zweigerdt