alexa A novel stem cell source for vasculogenesis in ischemia: subfraction of side population cells from dental pulp.
Cardiology

Cardiology

Journal of Clinical & Experimental Cardiology

Author(s): Iohara K, Zheng L, Wake H, Ito M, Nabekura J,

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Abstract Cell therapy with stem cells and endothelial progenitor cells (EPCs) to stimulate vasculogenesis as a potential treatment for ischemic disease is an exciting area of research in regenerative medicine. EPCs are present in bone marrow, peripheral blood, and adipose tissue. Autologous EPCs, however, are obtained by invasive biopsy, a potentially painful procedure. An alternative approach is proposed in this investigation. Permanent and deciduous pulp tissue is easily available from teeth after extraction without ethical issues and has potential for clinical use. We isolated a highly vasculogenic subfraction of side population (SP) cells based on CD31 and CD146, from dental pulp. The CD31(-);CD146(-) SP cells, demonstrating CD34+ and vascular endothelial growth factor-2 (VEGFR2)/Flk1+, were similar to EPCs. These cells were distinct from the hematopoietic lineage as CD11b, CD14, and CD45 mRNA were not expressed. They showed high proliferation and migration activities and multilineage differentiation potential including vasculogenic potential. In models of mouse hind limb ischemia, local transplantation of this subfraction of SP cells resulted in successful engraftment and an increase in the blood flow including high density of capillary formation. The transplanted cells were in proximity of the newly formed vasculature and expressed several proangiogenic factors, such as VEGF-A, G-CSF, GM-CSF, and MMP3. Conditioned medium from this subfraction showed the mitogenic and antiapoptotic activity on human umbilical vein endothelial cells. In conclusion, subfraction of SP cells from dental pulp is a new stem cell source for cell-based therapy to stimulate angiogenesis/vasculogenesis during tissue regeneration. This article was published in Stem Cells and referenced in Journal of Clinical & Experimental Cardiology

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