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ORIGINAL ARTICLE
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Antitumoral potential of microvesicles extracted from human adipose-derived mesenchymal stem cells on human breast cancer cells


1 Medical Biotechnology Research Center, Ashkezar Branch, Islamic Azad University, Ashkezar, Yazd, Iran
2 Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Correspondence Address:
Abdolreza Ardeshirylajimi,
Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran
Iran
Mahmood Dehghani Ashkezari,
Medical Biotechnology Research Center, Ashkezar Branch, Islamic Azad University, Ashkezar, Yazd
Iran
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jcrt.JCRT_147_18

 > Abstract 

Aim of Study: One of the new methods that have promising results is the use of cell-derived microvesicles (MVs) to kill tumor cells. Given that MVs contain apoptotic materials, genes, and proteins, they can interfere with the fate of adjacent cells.
Materials and Methods: In the present study, after adipose tissue-derived mesenchymal stem cells (AT-MSCs) isolation and characterization, MVs were derived from AT-MSCs and then characterized morphologically by standard error of the mean and size determination by DLS, and after that, the influence of MVs on human breast cancer cells (MCF-7) was investigated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium assay and apoptosis-related gene expression. The raw data were analyzed in SPSS.17 software.
Results: The results indicated that MVs have a size range of 500–1500 nm, and the viability of MCF-7 was significantly decreased when treated by different concentrations of MVs and it was confirmed when apoptosis-related genes' expression level was measured by real-time reverse transcription polymerase chain reaction whereas demonstrated that apoptosis genes including Bax, P53, P21, and EP300 (2−ΔΔCT) and ΔCT values were expressed significantly in MCF-7 treated by MVs higher than those nontreated, and decrease of Bcl-2 expression level in MVs-treated MCF-7 was also significant as an antiapoptosis-related gene.
Conclusions: Taking together, AT-MSC-derived MVs demonstrated anticancer or antitumoral properties on MCF-7 cells, and it could also be effective for other types of cancer cells.

Keywords: Adipose-derived mesenchymal stem cells, breast cancer and tumor, microvesicles



How to cite this URL:
Rezaie Z, Ardeshirylajimi A, Ashkezari MD, Seifati SM. Antitumoral potential of microvesicles extracted from human adipose-derived mesenchymal stem cells on human breast cancer cells. J Can Res Ther [Epub ahead of print] [cited 2019 Aug 19]. Available from: http://www.cancerjournal.net/preprintarticle.asp?id=251396


 > Introduction Top


Cancer is one of the most important noncommunicable diseases that are currently affecting human beings. Cancer is the second most common cause of death in the world, with 8.8 million deaths worldwide. According to statistics released in 2018, 1,735,350 new cancerous patients and 609,640 deaths are occurred due to cancers in the United States.[1] Breast cancer is the most commonly diagnosed cancer and is the fifth cause of cancer deaths in both men and women (571,000 in 2015) and the second cause of cancer death among women. Annually, about one million and a hundred thousand new cases of this disease are diagnosed, causing annual deaths of 500,000 people.[2] In the United States, in 2018, 266,120 cases of breast cancer have been estimated, of which a total of 40,290 deaths have been reported.[1]

The age of the disease in developed countries is 40–60 years, while, unfortunately, the prevalence rate in Iran is 10 years younger and 40–30 years old. The prevalence of this disease in Asian women is somewhat lower than in the United States and Western Europe.[3] Similarly, women in industrialized countries have a higher risk of infection than others, but Japan is an exception. Statistics and evidence have suggested a steady increase in the incidence of breast cancer since the mid-1940s. For example, in the United States, its prevalence rose from a ratio of 1 to 13 in 1970, from 1 to 11 in 1980, and from 1 to 8 (Available: http://www.breastcancer.org/symptoms/understand_bc/statistics).

The most important treatment for breast cancer is the use of chemical drugs (chemotherapy) based on the individual's disease stage. The challenges and side effects of this type of treatment in the body led to the introduction of more appropriate drugs by researchers with extensive studies.[4] Several studies were tried to introduce herbal or biological drugs with anticancer properties as an alternative for chemo-drugs.[5],[6],[7] One of the areas that have been widely considered by scientists and researchers in recent years is the use of stem cells in the treatment of many diseases. At the same time, stem cell users were faced with challenges that pushed scientists toward replacing them. The use of exosomes and microvesicles secreted from stem cells does not have challenges that may be exerted by stem cells including ethical problems and the rejection of transplants in the use of stem cells, and therefore, studies on the use of cellular exosomes and MVs have been very increased in recent years.[8],[9],[10] Regards to availability, simple accessibility, less invasive harvesting process, and intrinsic immunomodulatory properties of mesenchymal stem cells (MSCs), several studies have been reported that exosomes and MVs secrete from MSCs have a promising great therapeutic effect such as regenerative medicine, tumor inhibition, and immune regulation.[11],[12]

These MSC-derived exosomes and MVs may have some particular advantages such as fewer tendencies to initiate inherent and compromised immune responses for patient safety. These MVs can play an inhibitory role by proteins, mRNAs, and miRNAs.[13] These MVs can also be content of inhibitors of cancer stem cell (CSC) signaling, siRNAs/miRNAs targeting oncoprotein and CSC signaling, proapoptotic proteins, and proteasome that help to killing of the cancerous cells. The content of MVs varies according to the cell type and can have different effects on other cells. However, more studies are needed to more clear presentation of these functions because these effects depend entirely on the type of cells that release MVs, the type of cancer cells, and the stage in which it is located.[14] In this study, we have tried to investigate the effects of MVs secreted by human adipose-derived MSCs on the growth and proliferation rate of the human breast cancer cells.


 > Materials and Methods Top


Stem cell isolation and characterization

Isolation

Fat tissues were aspirated during liposuction procedures from abdomens of five men donors with an average age of 35 years (Razi Clinic, Tehran, Iran) with informed consent, according to the medical ethics guidelines of Shahid Beheshti University of Medical Sciences, Tehran, Iran. MSCs were extracted from fat tissues, according to the protocol was previously reported.[15] In brief, samples were transferred with Dulbecco's Modified Eagle's Medium (DMEM) supplemented with penicillin and streptomycin antibiotics and after that were washed three times with phosphate-buffered saline (PBS) content antibiotics while cutting them apart. Samples were incubated by 0.2% collagenase Type-I for a 30 min at 37°C while shaking slowly and then centrifuged at 1500 RPM for 15 min, and then supernatant was removed and cell pellet was suspended in the basal medium (DMEM supplemented with fetal bovine serum [FBS] 10% and antibiotics and antifungal) and transfer to the flasks. Culture media were exchanged every 2 days to remove nonadherent cells and cell's debris. After 4 days, cell density comes to 80%; cells were detached with 0.25% trypsin and subculture them to achieve a homogenous stem-cell numbers as adipose tissue-derived MSCs (AT-MSCs).

Characterizations

To characterize the isolated cells, osteogenic and adipogenic differentiation potential of them was investigated at passage 3 according to the previously reported protocols.[16] Stem cells were seeded with cell density of 2 × 104 cells per well at a 4-well plates under DMEM medium supplemented with 100 μM dexamethasone, 10 μM beta-glycerol phosphate, 50 μM ascorbic acid, and 10% FBS (all from Sigma-Aldrich, USA) for osteogenic differentiation and supplemented with 5 μL dexamethasone 1 μM, 5 μL insulin 1.7 μM, 5 μL indomethacin 200 μM, 5 μL isobutylmethylxanthine 500 μM, and FBS 10% (all from Sigma-Aldrich, USA) for adipogenic processes. Another 4-well plate was considered as a control group, which these cells cultured under basal media (DMEM supplemented with 10% FBS). Media were exchanged every 2 days and 14 days after seeding time, cells were fixed with paraformaldehyde 4% for 45 min at room temperature (RT) and then washed by cold PBS very slowly. Stem cells that differentiated into osteoblast, stained with alizarin red (Behnogen, Iran) for 10–15 min at RT, and those differentiated into adipocyte stained with Oil red (Merck, Germany) for 10 min at RT. Fixed control groups were also stained with alizarin red and oil red after 14 days.

Microvesicles' extraction

To MVs obtaining, first, the supernatants of several T-75 flasks with 80%–90% AT-MSCs at passage 3 were collected through centrifuge at 2000 rpm, 4°C for 10 min. Then, to eliminate apoptotic bodies and cell debris, the supernatant obtained from the previous step was centrifuged again at 10,000, 4°C for 20 min. After that, to achieve MVs pallet, the supernatant obtained from the previous step was centrifuged again at 60,000 g, 4°C for 1 h, and finally, the MVs pellets were washed in PBS by re-centrifuge at 60,000 g, 4°C for 1 h. MVs were stored at −70°C after aliquot in several microtubes, but protein concentration measurement was performed using freshly pellets using Bradford assay.

Microvesicles' characterization

Scanning electron microscopy

To morphological evaluation, isolated MVs were fixed with 3.7% glutaraldehyde (Sigma Aldrich, St. Louis, MO) for 20 min. Then, samples were washed twice with PBS; the fixed MVs were dehydrated through a graded series of ethanol (10 min for every section, 50%, 60%, 70%, 80%, 90%, and 100%). When ethanol evaporated from samples, they were left to dry at RT for an overnight on the glass plates and then mounted on aluminum stubs. Samples were examined by a scanning electron microscope (S-4500; Hitachi, Tokyo, Japan) at an accelerating voltage of 20 KV after gold-palladium sputtering.

Dynamic light scattering and zeta potential determinations

To DLS and zeta potential determinations of MVs, Zetasizer nanoseries instrument (Malvern Nano-Zetasizer = 532 nm laser wavelength) was used according to the previously reported protocol.[17] Scattering intensity distribution (z-average) was considered for MVs size and then nanoparticle-tracking analysis was performed with a NanoSight LM10 instrument equipped with the NTA 2.0 analytical software (NanoSight, Wiltshire, UK) for determining the size of MVs. These two experiments were performed after diluted MVs in PBS (1:1000) and all samples were analyzed as triplicate experiments.

Protein concentration assay

Total protein concentration content of extracted MVs was performed using a Bradford protein assay kit (Merck) according to manufacture's protocol. In brief, after preparing a concentration gradient of bovine serum albumin in a 96-well plate, the PBS-suspended MVs were also prepared as triplicate in that plate. Then, 200 μl of a Bradford reagent was added to the each well, and a micro-plate reader at 595 nm (BioTek Instruments, Winooski, VT, USA) was used for absorbance measurement of the samples. Finally, protein concentration was calculated through a standard curve and its line equation.

Breast cancer cell proliferation

In this project, MCF-7 cell line was used as the most widely used human breast cancer cell line. These cells are isolated from human breast squamous adenoma, adherent with a doubling time of 38 h. The cell vial was purchased in freezing form from Pasteur cell bank (Tehran, Iran) and after thawing in RPMI supplemented with 10% FBS and 1% penicillin and streptomycin antibiotics, sub-cultured several times when received to 90% confluence.

Cell survival assay by 3-(4,5-dimethylthiazol-2-yl) -2,5- diphenyltetrazolium

Cell viability was examined using 3-(4,5-dimethylthiazol-2-yl) -2,5-diphenyltetrazolium bromide (MTT) test to obtain a proper concentration of the MVs, which has a highest inhibitory effect on the MCF-7 cells' growth, as well as no inhibitory effect on AT-MSCs as a control group during 96 h. In addition, it should be noted that Etoposide was considered as a positive control as a common anticancer drug. MTT (10 μl) was added to the cells after 24, 48, 72, and 96 h, while cells were treated with the different concentrations of the MVs and Etoposide (0, 5, 10, 20, 30, 40, and 50 μg/ml) and the cells were incubated for 4 h at 37°C. After that, supernatant was removed and 100 μl of dimethyl sulfoxide was added to the wells for Formazan dissolving and then absorbance was read using a microplate reader at 570 nm (BioTek Instruments, Winooski, VT, USA). The median lethal dose (LC50) was considered for MVs and Etoposide that giving 50% cytotoxicity.

Real-time reverse transcription polymerase chain reaction

MCF-7 cells were cultured under the selected MVs concentration (20 μg/ml) and under basal media as a control group for 3 days. After that, expression level of the important apoptosis gene markers including P53, P21, EP300, Bcl-2, and β-actin as an endogenous control was measured using real-time reverse transcription polymerase chain reaction (RT-PCR) on days 1, 2, and 3. First, RNeasy kit (Qiagen, Germantown, MD, USA) was used for total RNA extraction according to the manufacturer's protocol. After that, cDNA was synthesized using a RevertAid First Strand cDNA synthesis kit (Fermentas, Burlington, ON, Canada). PCR parameters included denaturation at 95°C for 4 min, then 35 cycles at 95°C for 15 s, annealing at 60°C for 30 s, and elongation at 72°C for 30 s. Real-time RT-PCR was performed using SYBR Premix Ex Taq (TaKaRa Bio Inc., Otsu, Shiga, Japan). Rotor Gene 6000 (Corbett, Concorde, NSW, Australia) was used for the measurement of the gene expression levels. Primer sequences are demonstrated in [Table 1].
Table 1: Human primer's sequences used in real-time reverse transcriptase polymerase chain reaction analysis

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Statistical analysis

Experiments were carried out three times, and data are shown as mean ± standard deviation Real-time RT-PCR results were analyzed by REST 2009 software (Qiagen, Hilden, Germany) and the one-way analysis of variance using SPSS software (SPSS version 19, Chicago, IL, USA) was used for evaluation of significance, whereas 0.05 was considered as P value for statistical significance.


 > Results Top


Stem cells' characterization

Isolated stem cells were characterized first by morphologically with their spindle fibroblast-like shape at passage 2 [Figure 1]a and then by osteogenic and adipogenic differentiation potentials' investigation. Oil drop vesicles resulting by isolated stem cell's adipogenic differentiation were detected by oil-red staining in red color [Figure 1]b and deposited calcium due to osteogenic differentiation process was stained by alizarin red-S [Figure 1]c.
Figure 1: Optical micrographs of isolated mesenchymal stem cells from human adipose tissue at passage 2 (a), Oil red stained adipose tissue-mesenchymal stem cells 2 weeks after cultured under adipogenic differentiation medium (b) and Alizarin Red-stained adipose tissue-mesenchymal stem cells 2 weeks after cultured under osteogenic differentiation medium (c)

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Microvesicles characterization

Extracted MVs from AT-MSCs were characterized morphologically by standard error of the mean (SEM) [Figure 2]a and then the size of MVs was measured by DLS and result was showed that MVs size were with diameters of 500–1500 nanometer [Figure 2]b. AT-MSCs extracted MVs zeta potential was strongly negative − 60 ± 18 mV.
Figure 2: Scanning electron micrographs of fixed and dehydrated adipose tissue-mesenchymal stem cells derived microvesicles (a), dynamic light scattering result to size determination of microvesicles (b) and optical micrograph of MCF-7 cells as a human breast cancer cell line (c)

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Breast cancer cell proliferation and survival assay

Obtained MCF-7 cell line, as a routine human breast cancer cell line, was cultured and expanded and depicted in [Figure 2]c. MTT assay was done to investigate viability of MCF-7 cells when treated by different concentrations of the extracted MVs during 72 h, and results were showed that cell viability was decreased during 3 days in all treated groups (10, 20, and 30 μg/ml MVs) compared to the control group (0 μg/ml MVs) with increasing pattern during 3 days [Figure 3]a. MCF-7 was also treated by Etoposide as a common chemo-drug for cancer therapy and its survival was analyzed using MTT [Figure 3]b.
Figure 3: The viability of the MCF-7 cells using 3-(4,5-dimethylthiazol-2-yl) -2,5-diphenyltetrazolium assay when cultured under different concentrations of microvesicles (a) and Etoposide (b, A common anticancer drug as a control) (0, 10, 20, and 30 μg/ml) during different time points (0, 24, 48, and 72 h) after cell seeding. The significant differences (P < 0.05) between groups are indicated with (*)

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Gene expression

To more evaluation of which mechanism was used by MVs to decrease viability of the MCF-7 cells, four apoptotic genes and one antiapoptotic gene were investigated by real-time RT-PCR in MCF-7 cells were treated by 20 μg/ml MVs on all 3 days [Figure 4]. Expression level of the Bax, P53, P21, and EP300 genes was significantly increased 48 and 72 h after MCF-7 cells' treatment by MVs in comparison with nontreated cells, although P53 and P21 were also significantly increased in treated groups 24 h after treatment compared to the control. Bcl gene expression as an antiapoptotic factor was showed a decreasing pattern during the culture process for both treated and nontreated groups, while this decrease was significant in treated group compared to the nontreated group.
Figure 4: Relative expression of Bax, P53, P21, and EP300 as apoptotic genes and Bcl-2 as an antiapoptotic gene by real-time reverse transcription polymerase chain reaction in MCF-7 cells cultured with adipose tissue-derived mesenchymal stem cells derived microvesicles (20 μg/ml) and without microvesicles during different time points (0, 24, 48, and 72 h) after cell seeding. The significant differences (P < 0.05) between groups are indicated with (*) and (P < 0.01) indicated with (**)

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 > Discussion Top


The aim of this study was investigating the anticancer properties of the human AT-MSCs-derived MVs on the one of the most famous human breast cancer cell lines, MCF-7. We successfully extracted MVs and characterized by SEM, DLS, surface negative potential, and protein content using Bradford assay. Since, two most important items that are very critical during cell's lifespan (growth and proliferation) are cell-to-cell and cell-to-surface communications. Membrane activities including embedding vesicles that named MVs have an important role in cell-to-cell communications while mediate information exchange between cells since MVs content genetic materials such as miRNAs and mRNAs that can epigenetically reprogram their neighbor cells.[13],[18] Several studies were reported MVs secreted by MSCs derived from different sources that can exclude positive and negative responses from their neighbor cells.[19],[20] In addition, during the last decades, adult stem cells particularly MSCs have a critical role in the repair and regeneration of the injured tissues in the body that this role is due to migration capability of the MSCs to the injured site that named homing ability.[21] However, it is not completely clear that when MSCs migrate and incorporated to the tumor site, it has inhibitory effects on tumor progression or it has any enhancing effect, while it could be found several papers in all two characteristics of the MSCs in literature. Fonsato et al. examined the role of MVs derived from human adult liver stem cells (HLSC-MVs) in gastrointestinal cancers through in vitro and in vivo studies.[22] They in vitro results were showed that HeoG2 hepatoma and primary hepatocellular carcinoma cell's growth was inhibited when treated by HLSC-MVs and their in vivo results were also confirmed anticancer properties of the HLSC-MVs when injected to the ectopic tumors developed in SCID mice. In another study, Bruno et al. were observed that MVs isolated from bone marrow MSCs would have a protective effect against acute tubular damage. According to the results of microarray, they concluded that this effect is due to the presence of RNAs in MVs.[23] Our results were also showed that MVs extracted from AT-MSCs have a great anticancer property on breast cancer cells according to the MTT results and confirmed by upregulation of the apoptotic gene markers through real-time RT-PCR analysis. It has been demonstrated that MSCs derived MVs has an anticancer effect on various tumor cells, for example, Wu et al. investigated anticancer effects of MVs extracted from human umbilical cord Wharton's jelly-derived MSCs on the growth of the T24 cell line as a bladder tumor cell and their results revealed that cells growth markedly reduced by MVs. The cell growth pattern was studied at 24, 48, and 72 h after culture under the presence of MVs. T24 cells were also injected subcutaneously to the mice for ectopic in vivo evaluation of the antitumor effects of MVs and results demonstrated that tumor size was very small when T24 cells injected with MVs in comparison with injected with MSCs or alone. These inhibitory effects were resulted the protein kinase Akt and caspase-3 during apoptotic pathway activation.[24] There are several ways to use MVs for cancer treatment. For example, it can be used as a natural carrier for anticancer drugs, and on the other hand, miRNAs and surface proteins present in exosomes and MVs can specifically induce apoptosis or inhibit cancer signals in cancerous cells. In addition, this kind of treatment has no ethical problems and is also a natural base and has no side effects such as chemotherapy drugs.


 > Conclusions Top


According to the results, it could be concluded that MVs are involved in the various physiological and pathophysiological processes in the body, which is depended on the type of source cell and target cell and there will be a wide range of implications including escape from the immune system, angiogenesis and anti-angiogenesis, metastasis and anti-metastasis, preservation of stem cell plasticity, and phenotypic regulation.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
 > References Top

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