Bone mesenchymal stem cells differentiate into myofibroblasts in the tumor microenvironment

Zhang,Jing; Sun,Dingqi; Fu,Qiang; Cao,Qingwei; Zhang,Hui; Zhang,Keqin

doi:10.3892/ol.2016.4645

Bone mesenchymal stem cells differentiate into myofibroblasts in the tumor microenvironment

Authors:
- Jing Zhang
- Dingqi Sun
- Qiang Fu
- Qingwei Cao
- Hui Zhang
- Keqin Zhang
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Affiliations: Department of Nephrology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China, Department of Urology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, P.R. China
Published online on: May 30, 2016 https://doi.org/10.3892/ol.2016.4645
Pages: 644-650

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Abstract

The aim of the present study was to investigate the tropism of mesenchymal stem cells (MSCs) to the tumor microenvironment, and to evaluate the feasibility of bone marrow mesenchymal stem cells differentiating into myofibroblasts in vitro. A total of 1 ml bone marrow was extracted from the greater trochanter of one male New Zealand rabbit, and MSCs were obtained by density gradient centrifugation and cultured routinely. The surface markers were analyzed by flow cytometry. A VX2 tumor was aseptically excised from another male New Zealand rabbit and primary cultured. The tropism of MSCs for 30% and 50% VX2 conditioned medium was determined by using Transwell migration assays. MSCs were incubated in 30% VX2 conditioned medium for 7 or 14 days. The messenger (m)RNA levels and protein expression of α‑smooth muscle actin (α‑SMA) and vimentin were measured by reverse transcription‑polymerase chain reaction and western blotting. MSCs were observed to have a spindle shape. The cultured MSCs were cluster of differentiation (CD)44+, CD105+, CD106+ and CD34‑. VX2 cells demonstrated a spindle or polygon shape. In the Transwell assay, it was observed that the migrated cells appeared more frequently in the 30% VX2 conditioned medium group compared with the other groups when microscopically examined, which was additionally confirmed by the results of a colorimetric assay. The mRNA levels and protein expression of α‑SMA and vimentin significantly increased in the test group compared with the control group at 7 days (P<0.01), and further increased in the test group at 14 days (P<0.01). The results of the present study demonstrated that MSCs have tropism for the tumor microenvironment and furthermore, may differentiate into myofibroblasts in the tumor microenvironment in vitro. The present study suggested that MSCs may migrate to the tumor and subsequently differentiate into myofibroblasts due to the tumor microenvironment, which may lead to promotion of the growth of the tumor. The present study additionally suggested that MSCs may be the precursors of tumor/carcinoma‑associated myofibroblasts.

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