The CD34-like protein PODXL and alpha6-integrin (CD49f) identify early progenitor MSCs with increased clonogenicity and migration to infarcted heart in mice. Academic Article uri icon


  • We screened for surface proteins expressed only by the early progenitor cells present in low-passage, low-density cultures of the adult stem/progenitor cells from bone marrow referred to as mesenchymal stem cells or multipotent stromal cells (MSCs). Six proteins were identified that were selectively expressed in the early progenitors: podocalyxin-like protein (PODXL), alpha6-integrin (CD49f), alpha4-integrin (CD49d), c-Met, CXCR4, and CX3CR1. All were previously shown to be involved in cell trafficking or tumor progression. Antibodies to CD49f and PODXL, a sialomucin in the CD34 family, were the most robust for FACScan assays. PODXL(hi)/CD49f(hi) MSCs were more clonogenic and differentiated more efficiently than PODXL(lo)/CD49f(lo) cells. Inhibition of expression of PODXL with RNA interference caused aggregation of the cells. Furthermore, PODXL(hi)/CD49f(hi) MSCs were less prone to produce lethal pulmonary emboli, and larger numbers were recovered in heart and kidney after intravenous infusion into mice with myocardial infarcts.

published proceedings

  • Blood

altmetric score

  • 10

author list (cited authors)

  • Lee, R. H., Seo, M. J., Pulin, A. A., Gregory, C. A., Ylostalo, J., & Prockop, D. J.

citation count

  • 151

complete list of authors

  • Lee, Ryang Hwa||Seo, Min Jeong||Pulin, Andrey A||Gregory, Carl A||Ylostalo, Joni||Prockop, Darwin J

publication date

  • January 2009

published in