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Stem cell recruitment factors secreted from cord blood-derived stem cells that are not secreted from mature endothelial cells enhance wound healing

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Abstract

Wounds are one of the most frequently occurring medical complication. Stem cells were recently highlighted as a novel therapeutic approach to treating wounds, although some negative aspects of allogenic stem cell transplantation were observed, such as cellular source limitations and unknown side effects in vivo. To address and eliminate these side effects, we examined the wound healing effect of secretory factors released from human cord blood-derived stem cells (hCB-SCs) and human umbilical vascular endothelial cells (HUVECs) on cutaneous excisional wound models. The hCB-SCs retained endothelial progenitor cell characteristics and expressed MSC markers such as CD73, CD105, and CD44. Analysis of hCB-SC-conditioned medium (CM) indicated that hCB-SCs secrete distinctly unique cytokines and chemokines such as TGF-β, PDGF, bFGF, EGF, KGF, and VEGF, which are well known to be important in normal angiogenesis and wound healing. Furthermore, hCB-SCs also secreted stem cell-recruiting factors such as G-CSF and GM-CSF, whereas HUVECs did not. When CB-SC-CM was applied to wound sites, hCB-SC-CM accelerated the wound healing rate compared with HUVEC-CM- and control medium-treated groups. In addition, hCB-SC-CM treatment caused a more rapid re-formation of granulation tissue and re-epithelialization of wounds, which indicates that the therapeutic effect of hCB-SC-CM is due to secreted stem cell-recruiting factors from stem cells, not just from endothelial lineage cells. Taken together, these results suggest that secretory factors released from stem cells, not just from endothelial cells, could be an important mediator of stem cell therapy in ischemic tissue diseases.

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Acknowledgments

This research was supported by the Agenda Program (No.PJ00932102) from Rural Development Administration, Republic of Korea.

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Correspondence to Hyung Min Chung or Jung-Il Chae.

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Editor: T. Okamoto

Jumi Kim and Ji Hye Lee contributed equally to this work.

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Supplementary Fig. 1

Quantification analysis of c-kit positive cells in wound site after treatment of control-, hCB-SC and HUVEC conditioned medium at day 5. Quantification analysis result for c-kit positive cells in 10mm X 10mm tissue slide (n = 4) at day 5 after treatment of control-, hCB-SC and HUVEC conditioned medium. Statistical analysis was performed with the t-test. A value of P < 0.05 was considered statistically significant. The significance of differences was evaluated by paired two-tailed student’s t-tests (SAS version 8.0, Cary, NC, USA) (JPEG 38 kb)

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Kim, J., Lee, J.H., Yeo, S.M. et al. Stem cell recruitment factors secreted from cord blood-derived stem cells that are not secreted from mature endothelial cells enhance wound healing. In Vitro Cell.Dev.Biol.-Animal 50, 146–154 (2014). https://doi.org/10.1007/s11626-013-9687-0

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  • DOI: https://doi.org/10.1007/s11626-013-9687-0

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