Stem Cells
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First published online November 3, 2005
Stem Cells Vol. 24 No. 3 March 2006, pp. 717 -721
doi:10.1634/stemcells.2005-0214; www.StemCells.com
© 2006 AlphaMed Press

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TISSUE-SPECIFIC STEM CELLS

Old Bone Marrow Cells Inhibit Skin Wound Vascularization

Gina C. Schatteman, Ning Ma

Department of Exercise Science, University of Iowa, Iowa City, Iowa, USA

Key Words. Bone marrow • Angiogenesis • Aging • Wound healing • Sca-1 • Endothelial progenitor cell

Correspondence: Gina C. Schatteman, Ph.D., Department of Exercise Science FH412, University of Iowa, Iowa City, Iowa 52242, USA. Telephone: 319-335-9486; Fax: 319-335-6966; e-mail: gina-schatteman{at}uiowa.edu

Received May 12, 2005; accepted for publication October 28, 2005.
Local injection of hematopoietic stem cell–enriched cells, including mouse lin– cells, accelerates vascularization in animal injury models, apparently by release of angiogenic factors. Locally injected lin– cells from nondiabetic mice dramatically improve, but those from obese diabetic mice inhibit vascular growth in obese diabetic mouse skin wounds. Because of similarities between diabetes and aging and because autologous bone marrow–derived cells are currently being tested in clinical trials involving older patients, we investigated the effects of old lin– cells on skin wound vascularization in nondiabetic and obese diabetic mice. Treatment with old lin– bone marrow cells resulted in decreased vessel size and numerical density, leading to profoundly reduced vascular volume density in wounds of non-diabetic and diabetic mice. Our data suggest that bone marrow–derived cells may be poor candidates for therapeutic use in older patients and could actually harm them.




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