Conditioned medium from umbilical cord mesenchymal stem cells induces migration and angiogenesis

Shen,Chongyang; Lie,Puchang; Miao,Tianyu; Yu,Meixing; Lu,Qiao; Feng,Ting; Li,Jinrong; Zu,Tingting; Liu,Xiaohuan; Li,Hong

doi:10.3892/mmr.2015.3409

Conditioned medium from umbilical cord mesenchymal stem cells induces migration and angiogenesis

Authors:
- Chongyang Shen
- Puchang Lie
- Tianyu Miao
- Meixing Yu
- Qiao Lu
- Ting Feng
- Jinrong Li
- Tingting Zu
- Xiaohuan Liu
- Hong Li
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Affiliations: Key Laboratory of Obstetric, Gynecologic, Pediatric Diseases and Birth Defects of the Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China, Key Laboratory of Regeneratative Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong 510530, P.R. China, West China School of Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China, Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
Published online on: March 4, 2015 https://doi.org/10.3892/mmr.2015.3409
Pages: 20-30
Copyright: © Shen et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].

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Abstract

Umbilical cord mesenchymal stem cells (UC‑MSCs) have been suggested as a candidate for various clinical applications, however, major limitations include the lack of organ‑specific accumulation and low survival rates of transplanted cells. In the present study, it was hypothesized that the paracrine effects of UC‑MSCs may enhance stem cell‑based tissue repair and regeneration by promoting the specific homing of stem/progenitor cells and the overall ability to drive them to the damaged area. UC‑MSCs‑derived conditioned medium (UC‑CM) was analyzed using liquid chip and ELISA techniques. In vitro tube formation assays of human umbilical vein endothelial cells (HUVECs) and UC‑MSCs were then performed to assess the angiogenic properties of UC‑CM. Subsequently, UC‑MSCs, HUVECs and fibroblasts were labeled with PKH26 for an in vivo cell migration assay. The expression levels of C‑X‑C chemokine receptor 4 (CXCR4), C‑C chemokine receptor 2 (CCR2) and c‑met were determined in the UC‑MSCs, HUVECs and fibroblasts using reverse transcription‑quantitative polymerase chain reaction and flow cytometry. UC‑CM was incubated with or without antibodies, and the contribution of stromal cell‑derived factor 1 (SDF‑1), monocyte chemotactic protein 1 (MCP‑1) and hepatocyte growth factor (HGF) on the migration of cells was investigated in vitro. The results demonstrated that UC‑MSCs secreted different cytokines and chemokines, including increased quantities of SDF‑1, MCP‑1 and HGF, in addition to the angiogenic factors, vascular cell adhesion protein‑1, interleukin‑8, insulin‑like growth factor‑1 and vascular endothelial growth factor. The total lengths of the tubes were significantly increased in the UC‑MSCs and HUVECs incubated in UC‑CM compared with those incubated in Dulbecco's modified Eagle's medium. In vivo cell migration assays demonstrated that UC‑CM was a chemotactic stimulus for the UC‑MSCs and HUVECs. In vitro Matrigel migration and scratch healing assays demonstrated that UC‑CM increased the migration of CXCR4‑postive or/and CCR2‑positive cells in a dose‑dependent manner. In addition, different molecules were screened under antibody‑based blocking migration conditions. The data revealed that the SDF‑1/CXCR4 and MCP‑1/CCR2 axes were involved in the chemoattractive activity of UC‑CM and suggested that the effective paracrine factor of UC‑CM is a large complex rather than a single factor. The results of the present study supported the hypothesis that UC‑MSCs release soluble factors, which may extend the therapeutic applicability of stem cells.

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