title: Endothelial progenitor cells as putative targets for angiostatin.
abstract: Angiostatin, a product of the proteolytic cleavage of plasminogen, possesses potent antitumor and antiangiogenic properties in vivo. Studies with cultured endothelial cells suggest that under certain conditions, angiostatin inhibits the migration and proliferation of these cells or, alternatively, increases their rate of apoptosis. In general, the effects of angiostatin have been considerably less potent in vitro than in vivo. One potential explanation for this disparity is that the in vivo target of angiostatin is not the mature endothelial cell. Recently, evidence has accumulated to show that circulating endothelial progenitor cells (EPCs) contribute to neovascularization. In this study, we have isolated EPCs from human subjects and demonstrated that, in contrast to that of mature endothelial cells, the growth of EPCs is exquisitely sensitive to angiostatin. These results suggest that angiostatin and related compounds may exert their biological effects by inhibiting the contribution of EPCs to angiogenesis and not by altering the growth of mature endothelial cells.
authors.affiliation: Laboratory of Molecular Biology, NHLBI, NIH, Bethesda, MD 20892-1650, USA.
authors.forename: H
authors.initials: H
authors.lastname: Ito
authors.forename: I I
authors.initials: II
authors.lastname: Rovira
authors.forename: M L
authors.initials: ML
authors.lastname: Bloom
authors.forename: K
authors.initials: K
authors.lastname: Takeda
authors.forename: V J
authors.initials: VJ
authors.lastname: Ferrans
authors.forename: A A
authors.initials: AA
authors.lastname: Quyyumi
authors.forename: T
authors.initials: T
authors.lastname: Finkel
mesh_terms: D043168:Angiostatins; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000166:cytology* / Q000187:drug effects; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D006801:Humans; D007700:Kinetics; D010446:Peptide Fragments / Q000494:pharmacology*; D010958:Plasminogen / Q000494:pharmacology*; D014471:Umbilical Veins
chemical_list: D000970:Antineoplastic Agents; D010446:Peptide Fragments; D043168:Angiostatins; D010958:Plasminogen