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Limitations of Cross-Talk Between Osteosarcoma and Bone Marrow-Derived Mesenchymal Stem Cells.


Osteosarcoma is the most common type of bone cancer and the second leading cause of cancer-related deaths in children and young adults (1, 2). Although the origin of the disease remains unclear, the most likely candidates are seen as mesenchymal stem cells (MSCs) or osteoprogenitor cells (3). MSCs are characterized by their ability to differentiate into mesenchymal cell types such as osteoblasts, chondrocytes, adipocytes, muscle cells, pericytes, reticular fibroblasts, and even neural cells. They also represent a heterogeneous population of cells consisting of multipotent and progenitor cells and provide micro-environmental regulation that controls the dormancy and proliferation of hematopoietic stem cells in bone marrow and migrate to damaged areas in many pathological conditions such as inflammation, tissue repair, and neoplasia (4, 5). Recent studies show that these cells take important roles in tumor behavior.

The tumor cells communicate with neighbouring and distant cells to attract allies and reprogram micro-environment to benefit tumor growth, invasion, and metastasis. This cross-talk mechanisms involved in the collection of MSCs in tumor site are very similar to the activation and migration processes of inflammatory cells (6). The tumor cells secrete soluble factors and pro-inflammatory proteins to attract MSCs to the region (7-9). Microvesicles and exosomes also take an important role to transfer materials between cells (10). Furthermore, this interaction is double-sided. While primer and metastatic tumor cells attract MSCs from bone marrow, the stem cells also attract them into themselves (11-13).

The cross-talk not only influence the attraction of cells but, also modulate the phenotype and functional characteristics, therefore tumor progression (14, 15). In this dynamic micro-environment, soluble factors and extracellular vesicles reprogram the MSCs. In turn, the stem cells secrete pro-tumorogenic molecules and bodies (16). As a result, the tumor gets more aggressive in character while MSCs also changes to cancer stem-cell like phenotype (17).

Bone marrow-derived mesenchymal stem cells (BM-MSCs) are locally adjacent to tumor tissues. In addition, the cross-talk influences metastasis character of both cells. This study is aimed to investigate the effect of the cross-talk between Osteosarcoma (OS) and BM-MSCs in both hypoxic and normoxic conditions. Since this cross-talk double-sided, the results might suggest new approaches to limit metastasis to bone marrow and also prevent the migration.


Cell Culture

Human Umbilical Vein Endothelial Cells (HUVEC) (ATCC[R] CRL-1730[TM]) was obtained from American Type Culture Collection (Rockville, CT, USA) and cultured in Dulbecco's Modified Eagle Medium low-glucose containing 10% fetal bovine serum (FBS, Cegrogen Biotech GmbH, Stadtallendorf, Germany) and 1% penicillin/streptomycin (Biochrom GbmH, Berlin, Germany). Cells were incubated in 5% C[O.sub.2] incubator at 37[degrees]C in humidified air.

Bone Marrow-Derived Mesenchymal Stem Cell Culture

Human BM-MSCs (ATCC[R] PCS-500-012[TM]) were cultured in Mesenchymal Stem Cell Basal Medium for Adipose, Umbilical and Bone Marrow-derived MSCs (ATCC[R] PCS-500-030[TM]) supplemented with 7% FBS, 15 ng/mL rh IGF-1, 125 pg/mL Rh FGF-b, and 2.4 mM L-Alanyl-L-Glutamine. Cells were incubated in 5% C[O.sub.2] incubator at 37[degrees]C in humidified air. After 72 hours, the culture media of the cells were collected and maintained at -80[degrees]C to use in invasion/migration experiments as chemoattractant.

In Vitro Co-culture Models

The same amount of MG-63 and BM-MSCs were seeded into 25 [cm.sup.2] flasks in DMEM low glucose (Cat no: F1218, Biochrom GmbH, Germany) with 10% FBS and 1% penicillin-streptomycin. Hanging-drop plates were used for preparing the 3D cell culture model. The volume of each droplet was calculated as 50 [micro]l as BM-MSCs and BM-MSCs + MG-63 co-culture. The number of cells to be resuspended in each drop was optimized to 2.5x[10.sup.4] cells. 3 ml of PBS was added for moisture in the chamber, located on the side of the plate. Cell incubated in 37[degrees]C, 5% C[O.sub.2] for 72 hours. After 72 hours, the culture media of the cells were collected and maintained at-80[degrees]C to use in invasion/migration experiments as chemoattractants.

Normoxic and Hypoxic Conditions

Normoxic conditions were provided in 5% C[O.sub.2], 20% [O.sub.2] and 37[degrees] C incubators, and hypoxic conditions in 5% C[O.sub.2], 1% [O.sub.2] and 37[degrees]C incubators.

Measuring the Effect of BM-MSCs on Invasion and Migration Under Normoxic and Hypoxic Conditions

Osteosarcoma cells and BM-MSCs were cultured both as separate and co-cultures under normoxic and hypoxic conditions. xCELLigence RTCA System (ACEA, Biosciences, San Diego, CA) and CIM-Plate 16 were used to determine the effects of these conditions on invasion and migration capacities of osteosarcoma cells. Matrigel was used to determine invasion of cells.

To prepare the xCELLigence System, 1% and 20% FBS, BM-MSCs and BM-MSCs + MG-63 cultured in both normoxic and hypoxic conditions, that are seeded as a chemoattractant in the lower wells of the plates separately. 4x104 cells cultured in both conditions are seeded to the upper wells as their culture conditions match with the chemoattractants. The measurements were made real time for 48 hours.

Identifying the Shifting in Metastatic Phenotype of OS with Fluorescent Immunohistochemistry

The group to which 20% FBS was administered in MG-63 cells was accepted as a positive group in which invasion and migration were induced. Cells were incubated for 48 hours in normoxic and hypoxic conditions in Chambered Cell Culture Slides (Falcon, USA). The culture media was aspirated and the cells were washed with PBS. Subsequently, cells were fixed by incubation with 4% paraformaldehyde (Electron Microscopy Sciences, Hatfield, Pa., USA) for 20 min at room temperature. After the fixation, cells were incubated overnight at 4[degrees]C with N-cadherin (dilution 1:500) antibody diluted in staining buffer (1% bovine serum albumin in PBS and 0.3% Triton X-100). After overnight incubation, the cells were washed twice with PBS to avoid residual primary antibody. After washing steps, the cells were incubated with Alexa Fluor 568 (dilution 1:500) secondary antibodies for 2 hours at room temperature under mild agitation. After application of the secondary antibodies, DNA was incubated with nucleotide 4', 6-Diamidino-2-Phenylindole, Dihydrochloride (DAPI) (dilution 1:1000) for 5 min at room temperature. After all staining steps, the cells were carefully washed and viewed with a fluorescence microscope after selection of the appropriate wavelength (568 nm for N-fader).

Statistical analysis

Analyzing the data, SPSS V. 15.0 (SPSS, Chicago, Illinois, USA) was used. For numerical values found in the figures and also text, the mean [+ or -] the standard error (SE) was used. A non-parametric Mann Whitney U test was used to determine the statistical significance. All P-values <0.05 were considered statistically significant.


MG-63 and BM-MSCs Cross-Talk Effect on BM-MSCs

In the migration model, measurements were made real time for 48 hours. As a chemoattractant, 1% FBS medium was used as a negative control and 20% FBS medium as a positive control. The total and time-dependent effects (rates) of chemoattractants were obtained from BM-MSCs and the co-culture between MG-63 and the stem cells by xCelligenceDP real-time cell analysis instrument.

It is observed that the total effect of normoxic microenvironment on cell migration in 3D cell culture that 20% FBS, BM-MSCs and BM-MSCs + MG-63 chemoattractants increased the migration 1.83, 16.11 and 4.42 fold; on the other hand in hypoxia the chemoattractants increased by 3.04, 10.38 and 7.11 fold respectively, compared to 1% FBS at the end of 12 hours. At the 24th hour, these chemoattractants increased cell migration 3.38, 26.43 and 7.25 fold in normoxia and 2.90, 9.88 and 6.78 fold in hypoxia and it is also compared to 1% FBS. In addition to migration rates between 12th and 24th hours in MG-63, the chemoattractants increased the rate 0.09, 0.17, 0.12 fold in normal oxygen levels and rate 0.03, 0.26 and 0.13 fold in the hypoxic microenvironment.

Similarly to the migration model, measurements were also made real time for 48 hours and same chemoattractants were used in the invasion assay. However, the major difference between the migration and the invasion models was the matrigel that mimics the structure of basal membrane which leads only the cells having invasive character could pass from upper chamber to a lower one.

The assay established that the total effect of normoxic microenvironment on cell invasion in 3D cell culture with 20% FBS, BM-MSCs and BM-MSCs + MG-63 chemoattractants increased the invasion 2.24, 9.51 and 2.51 fold; and the chemoattractants increased it 3.82, 12.29 and 5.28 fold respectively, compared to 1% FBS at the end of 12 hours in hypoxia. At the 24th hour, the chemoattractants enhanced the cell invasion 1.99, 8.71 and 2.99 fold in normoxia and 3.74, 23.43 and 8.76 fold in hypoxia and it is also compared to 1% FBS. Moreover, invasion rates between 12th and 24th hours in MG-63 cells measured by xCelligence DP RTCA appraised that the chemoattractants raised the rate 0.07, 0.30, 0.17 fold in normal oxygen levels and rate 0.03, 0.26 and 0.13 fold in the hypoxic microenvironment.

The most effective chemoattractant that increases the rate of migration in the osteosarcoma cell line under both normoxic (P 0.02) and hypoxic (P 0.004) conditions has been found to be the chemoattractant obtained from the BM-MSC culture. Moreover, the experiment revealed that when MG-63 cells were co-cultured with BM-MSCs, the capacity of BM-MSC on the migration of osteosarcoma decreases. (P 0.004 for normoxia and hypoxia) A parallel effect is also observed in invasion results. (P 0.004 for both conditions) Also on the invasion, it seems that the cross-talk reduces the effect of BM-MSCs (Figure 1).

Effect of Co-culture on Metastatic Phenotype of BM-MSCs

The mesenchymal character representing the metastatic phenotype of BM-MSCs and BM-MSCs + MG-63 co-culture chemoattractants were evaluated with osteosarcoma cells exposed to these BM-MSCs and BM-MSC + MG-63 in the metastasis process. Changes in the mesenchymal phenotype marker N-cadherin (red) expression were demonstrated by fluorescence immunocytochemical techniques. MG-63 cell line under normal growth conditions was used as a control and osteosarcoma cells exposed to BM-MSCs and BM-MSCs + MG-63 co-culture chemoattractants were compared (Figure 2).

To obtain quantitative data of N-cadherin expression, pixel analysis was performed on the obtained fluorescence immunocytochemical images by an image analysis program. As a result of the generated graphs and structured statistical analysis with Mann Whitney U tests, when the expressions in the control group were compared with the MG-63 cells incubated with the BM-MSCs chemoattractant, the increases in the N-cadherin expressions were found to be statistically significant (P 0.003 for co-culture and P 0.002 for BM-MSCs). A decrease in N-Cadherin expression of the MG-63 exposed to the co-culture between BM-MSCs and MG-63 is observed, compared to the stem cell condition. (P 0.015) This result is similar with earlier findings of this study in the migration and the invasion assays.


The present study investigates the effectiveness of BM-MSCs on migration and invasion of MG-63 osteosarcoma cell lines. In the migration and the invasion models, the results revealed that the BMMSCs is the most effective chemoattractant in both normoxic and hypoxic microenvironment. Even though the MG-63 and the stem cell co-culture has also a positive chemoattractant effect on tumor cells, its effect is lower than the effect of BM-MSCs alone. The altered expressions of N-cadherin point out that there is a related shift in metastatic phenotype of the MG-63 exposed to BM-MSCs and the co-culture conditions. As a consequence, it is concluded that the coculture limits the effectiveness of BM-MSCs on metastatic behavior.

Several studies have found the presence of stem cells which facilitate migration and growth in the environment (18-20). In osteosarcoma, Huang J et. al showed that MSCs promotes both growth and metastasis (21). Other studies also point an increase in the metastasis via cross-talk between OS and BM-MSCs (22, 23). The metastasis increases by 10-fold considering the impact of BM-MSCs in the literature (24, 25). The data obtained from the results in the present study are also similar. Additionaly, it has been observed that a direct co-culture between OS and BMMSCs as an attractant limits the capacity to both migrate and invade.

Contrary to the results in osteosarcoma, Sarah M. Ridge et al. recorded that treatment with condition mediums of some metastatic prostate cancer to BM-MSCs has enhanced the capacity on the migration of PC3 cell line compared to untreated MSCs. However, such an effect is not observed for 22Rv1 or DU145 prostate cancer cells, which suggests that PC3 may modulate the behavior of MSCs that is beneficial specifically to PC3 cells (12) The source of BM-MSCs investigated in the study is bone marrow aspirates from Pca patients and healthy volunteers. Furthermore, the exposure time of MSCs to the condition mediums of Pca cell lines is much longer when the time is 30 days in the study whereas we treated BM-MSCs in co-culture with osteosarcoma for 72 hours. The extended time would probably cause differentiation of BM-MSCs and researchers studied the changes in both character and phenotype of differentiated BM-MSCs. Moreover, the direct co-culture would affect BM-MSCs and the secreted soluble factors which change the metastasis of indirect co-cultured MG-63 s via paracrine effect in the study. The phenotypes of cancer cells are essential for the examination of metastatic characteristics. N-Cadherin is a marker which increases with metastasis in many types of cancers such as breast and colon cancers, neuroblastoma, and osteosarcoma (26-29). In addition, H. Rai and J. Ahmed point out the increase in N-cadherin which is related to the mesenchymal transition in tumor progression since it mediates a less stable cell-cell adhesion (30). N-cadherin, a mesenchymal marker, was examined by fluorescent immunocytochemistry. The staining was performed to demonstrate the effect of the BMMSCs chemoattractant group and the BM-MSCs + MG-63 coculture chemoattractant group on the invasion and migration to demonstrate that the metastasis process is induced by cross-talk in BM-MSCs and BM-MSCs + MG-63 co-culture group.

Therefore, the increase in N-cadherin expression might explain the enhanced migration capacity in the OS exposed to BM-MSCs whereas the lower expression observed in the co-culture treated MG-63, consistent with the results in migration and invasion models of this study.

This study investigates the effects of mesenchymal stem cell on tumor behaviour in 3-dimensional (3D) in vitro cancer model mimicking in vivo tissue features best with creating different microenvironments (31). It allows the cell to make cell-cell interaction without polarization, an organization with the extracellular matrix in addition to growth factors, chemokines, and cytokines. Moreover, real-time measurements made it possible to observe the process (32, 33). The decreased shifting in N-cadherin expression of co-culture compared to BM-MSCs also support the results for migration and invasion models. The study could be expanded with an animal model since in vivo studies mimic microenvironments more accurately and could provide some conditions which are difficult to predict.

In the co-culture conditions, BM-MSCs and MG-63 cross-talk by releasing cytokines and chemokines which contribute to tumor invasion and migration. It is revealed that this interaction limits the effect of BM-MSCs on metastasis. In future studies, it is suggested to research the role of the cytokines and chemokines in this manner. This could provide a new scientific approach to downregulate the metastasis by decreasing the effect of BM-MSCs.


Special thanks to Gizem Calibasi-Kocal, Mahdi Akbarpour, Ece Cakiroglu, and Kagan Dagdeviren, for their professional and technical support on this project.

Funding Statement

This work was supported by Dokuz Eylul University Scientific Research Coordination Unit (Project Number: 2017.KB.SAG.003) and Tailor of Science Biotechnology Innovation I.C. (Project Number: TSCI.Project.001)

Informed Consent: Written informed consent was obtained from patient who participated in this study.

Peer-review: Externally peer-reviewed.

Author Contributions: Concept - TU; Design - YB; Supervision - YB; Fundings - TY; Materials - AP; Data Collection and/or Processing - TU; Analysis and/or Interpretation - HCM; Literature Search - CK; Writing Manuscript - ED; Critical Review - HE

Conflict of Interest: No conflict of interest was declared by the authors.

Financial Disclosure: The authors declared that this study has received no financial support.


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Yasemin Basbinar (1) [iD], Tugba Uysal (1) [iD], Caner Karaca (2) [iD], Ezgi Daskin (1) [iD], Hanife Ecenur Meco (1) [iD], Ahu Pakdemirli (3) [iD], Turkan Yigitbasi (4) [iD], Hulya Ellidokuz (5) [iD]

(1) Dokuz Eylul University, Institute of Oncology, Translational Oncology Department, Izmir, Turkey

(2) Dokuz Eylul University, Institute of Health Sciences, Department of Oncology, Izmir, Turkey

(3) Dokuz Eylul University, Vocational School of Health Services, Department of First and Emergency Aid, Izmir, Turkey

(4) Istanbul Medipol University, Faculty of Medicine, Department of Biochemistry, Istanbul, Turkey

(5) Dokuz Eylul University Oncology Institute Department of Preventive Oncology, School of Medicine Department of Biostatistics and Medical Informatics, Izmir, Turkey.

Address for Correspondence: Yasemin Basbinar, E-mail:

Received: 12.04.2019201; Accepted: 27.04.2019; Available Online Date: 28.05.2019

Cite this article as: Basbinar Y, Uysal T, Karaca C, Daskin E, Meco HE, Pakemirli A, Yigitbasi T, Ellidokuz H. Limitations of Cross-Talk Between Osteosarcoma and Bone Marrow-Derived Mesenchymal Stem Cells. J Basic Clin Health Sci 2019; 3:83-88.
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Title Annotation:Original investigation
Author:Basbinar, Yasemin; Uysal, Tugba; Karaca, Caner; Daskin, Ezgi; Meco, Hanife Ecenur; Pakdemirli, Ahu;
Publication:Journal of Basic and Clinical Health Sciences
Date:May 1, 2019
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