title: Therapeutic effects of human STRO-3-selected mesenchymal precursor cells and their soluble factors in experimental myocardial ischemia.
abstract: Stromal precursor antigen (STRO)-3 has previously been shown to identify a subset of adult human bone marrow (BM)-derived mesenchymal lineage precursors, which may have cardioprotective potential. We sought to characterize STRO-3-immunoselected and culture-expanded mesenchymal precursor cells (MPCs) with respect to their biology and therapeutic potential in myocardial ischemia. Immunoselection of STRO-3(+)  MPCs enriched for fibroblastic colony forming units from unfractionated BM mononuclear cells (MNCs). Compared to mesenchymal stem cells conventionally isolated by plastic adherence, MPCs demonstrated increased proliferative capacity during culture expansion, expressed higher levels of early 'stem cell' markers and various pro-angiogenic and cardioprotective cytokines, and exhibited greater trilineage developmental efficiency. Intramyocardial injection of MPCs into a rat model of myocardial infarction (MI) promoted left ventricular recovery and inhibited left ventricular dilatation. These beneficial effects were associated with cardioprotective and pro-angiogenic effects at the tissue level, despite poor engraftment of cells. Treatment of MI rats with MPC-conditioned medium (CM) preserved left ventricular function and dimensions, reduced myocyte apoptosis and fibrosis, and augmented neovascularization, involving both resident vascular cells and circulating endothelial progenitor cells (EPCs). Profiling of CM revealed various cardioprotective and pro-angiogenic factors, which had biological activity in cultures of myocytes, tissue-resident vascular cells and EPCs. Prospective immunoselection of STRO-3(+)  MPCs from BM MNCs conferred advantage in maintaining a population of immature MPCs during ex vivo expansion. Transplantation of culture-expanded MPCs into the post-MI heart resulted in therapeutic benefit, attributable at least in part to paracrine mechanisms of action. Thus, MPCs represent a promising therapy for myocardial ischemia.
authors.affiliation: The University of Melbourne, St Vincent's Hospital, Department of Medicine, Melbourne, Victoria, Australia. fiona.see@nyumc.org
authors.forename: Fiona
authors.initials: F
authors.lastname: See
authors.forename: Tetsunori
authors.initials: T
authors.lastname: Seki
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Psaltis
authors.forename: Hugo P
authors.initials: HP
authors.lastname: Sondermeijer
authors.forename: Stan
authors.initials: S
authors.lastname: Gronthos
authors.forename: Andrew C W
authors.initials: AC
authors.lastname: Zannettino
authors.forename: Klaas M
authors.initials: KM
authors.lastname: Govaert
authors.forename: Michael D
authors.initials: MD
authors.lastname: Schuster
authors.forename: Paul A
authors.initials: PA
authors.lastname: Kurlansky
authors.forename: Darren J
authors.initials: DJ
authors.lastname: Kelly
authors.forename: Henry
authors.initials: H
authors.lastname: Krum
authors.forename: Silviu
authors.initials: S
authors.lastname: Itescu
mesh_terms: D000818:Animals; D000941:Antigens / Q000032:analysis; D001853:Bone Marrow / Q000378:metabolism; D016207:Cytokines / Q000235:genetics / Q000378:metabolism; D004195:Disease Models, Animal; D006801:Humans; D045164:Mesenchymal Stem Cell Transplantation; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000378:metabolism*; D017202:Myocardial Ischemia / Q000628:therapy*; D011923:Rats, Nude; D017154:Stromal Cells / Q000378:metabolism
chemical_list: D000941:Antigens; D016207:Cytokines