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Updated: Feb 11, 2026

Derivation of Cardiac Progenitor Cells from Embryonic Stem Cells
Published on: January 12, 2015
β1-integrin is a cell-autonomous factor mediating the Numb pathway for cardiac progenitor maintenance
Brian C Gibbs1, Lincoln Shenje1, Peter Andersen1
1Division of Cardiology, Department of Medicine, Institute for Cell Engineering, Cellular and Molecular Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
None:
Proper control of multipotent/stem cell number and fate is essential for ensuing organ formation during development. β1-integrin, a subfamily of cell surface receptors, has a conserved role in maintenance of multipotent/stem cells, including renal progenitor cells, follicle stem cells, epidermal stem cells and neural stem cells. However, it remains unclear whether β1-integrin has a role in cardiac progenitor cell (CPC) development. Here we show that a mesodermal deletion of β1-integrin decreases Isl1+ cell number in the second pharyngeal arch (PA2), where CPCs undergo renewal and expansion. Mesp1 lineage-specific mosaicism revealed that β1-integrin-deleted Isl1+ cells do not proliferate in the PA2. Consistently, β1-integrin-deleted Isl1+ CPCs failed to expand in vitro, independent of PA2 cells. β1-integrin co-localized and physically associated with Numb, a crucial regulator of CPC renewal and expansion. Importantly, Numb/Numbl-deleted CPCs showed dramatic reduction in β1-integrin levels. These findings suggest that β1-integrin is a key mediator of the Numb pathway in CPC maintenance.
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