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Chronic Inflammation May Enhance Leiomyoma Development by the Involvement of Progenitor Cells.

1. Introduction

Uterine leiomyomas (fibroids) are benign tumors originating from the myometrium and the most common neoplasms of the female reproductive system [1, 2]. They cause prolonged bleeding, pelvic pain, recurrent abortions, and adverse obstetric outcomes and are a significant cause of infertility [3-5]. Their origin and pathophysiology are unclear. A wide range of factors, from genetic aberrations [6] to an undifferentiated cell population that could give rise to them [7,8], has been investigated. The latter hypothesis is supported by the uterine tissue remodeling that occurs during life in physiological [9] and pathological conditions [10].

One possible explanation for the development of leiomyomas is the dysregulation of mesenchymal stem cell activity [9]. Previous studies [11, 12] have proposed that undifferentiated cells are involved in myometrial pathologies, and also leiomyoma onset may be the result of impaired function, proliferation, and differentiation of undifferentiated cells inside the myometrium that are under the effect of ovarian hormones [13,14]. Moreover, the clonality of leiomyomas that originate from a single altered cell strongly enforces this hypothesis [1, 15, 16]. Undifferentiated cells have been sought in normal myometrium and leiomyoma tissue by a variety of techniques to address different questions [17-20]. A role for the microenvironment has been suggested for many tumor types, including leiomyoma [21-24], with inflammation appearing to exert a major effect. If the condition causing acute inflammation is not resolved, the inflammation may become chronic, favoring tumor onset and development. Chronic inflammation is maintained by cytokines secreted by the immune system as well as undifferentiated cells [25-29], which are involved in a complex crosstalk with neoplastic cells. These cytokines influence proliferation, fibrosis, and angiogenesis, which in turn sustain fibroid formation and growth [30-32]. Considering that (i) the existence of undifferentiated cells may correlate with leiomyoma onset, (ii) inflammation may sustain leiomyomas, and (iii) cytokines secreted by undifferentiated cells create an inflammatory microenvironment, this study was performed to isolate and characterize undifferentiated cells from myometrium (myometrial progenitor cells, MPCs) and from leiomyoma tissue (leiomyoma progenitor cells, LPCs) and to evaluate the expression of selected inflammation-related cytokines. In addition, the expression of MDR1 (a member of ABC family recognized as a stem cell marker) and of [alpha]-SMA, collagen type 1, and fibronectin (primary component of the extracellular matrix involved in fibroid development) was tested.

2. Materials and Methods

2.1. Ethics Statement. All patients provided their written informed consent to participate in the study, which was approved by the institutional ethics committees and was conducted in accordance with the Declaration of Helsinki.

2.2. Human Tissue Collection. Leiomyoma and normal myometrium samples were collected from 12 women of childbearing age (range 30-35 years) undergoing hysterectomy for symptomatic fibroids from February to November 2016 at "Salesi Hospital," Ancona. We investigated normal myometrium and leiomyoma tissue from the same 12 patients with a histologically confirmed diagnosis of leiomyoma. All tissue samples were collected in the operating room under surgical conditions from a trained operator. After removal of the uterus, one small fragment (3-5 mm) from the largest leiomyoma and one (3-5 mm) from normal myometrium was removed by a cold-blade scalpel. The samples were placed in MSCGM medium (Mesenchymal Stem Cell Growth Medium, Lonza, Basel, Switzerland) and sent to our laboratory for processing. We reported the size (in cm), topographic site (anterior, posterior, left lateral, right lateral, and fundal), and location (subserosal, intramural or submucosal) of fibroids from where the samples were obtained. The removal of the sample did not alter the histopathological analysis in any case. All patients displayed good general condition; none of them had a history of myomectomy or uterine surgery, had received medical therapy or oral contraceptives in the previous three months, or had evidence of genital tract infection, endometriosis, or ovarian disease. All had a negative cervical vaginal swab collected prior to surgery, which was performed in the proliferative phase of the cycle. Adenomyosis or other uterine disorders demonstrated on histopathological examination were exclusion criteria.

2.3. Cell Culture. Tissue fragments (2-3 [mm.sup.3]) were firstly subjected to mechanical digestion then to enzymatic digestion with 0.2% type II collagenase (Sigma-Aldrich, Milan, Italy) at 37[degrees]C for 4 hours; subsequently, partially digested solution was placed into 6-well plates containing MSCGM medium which enhances the growth of undifferentiated cells and maintained in culture using same media at 37[degrees]C in 95% air and 5% C[O.sup.2]. The growth medium was changed after 24 hours to remove unattached cells and then twice a week. Cell morphology was evaluated by phase-contrast microscopy (Leica DM IL; Leica Microsystems GmbH, Wetzlar, Germany) and viability by an automated cell counter (Invitrogen, Milano, Italy). All further analyses involved separate assays of the specimens from each participant up to the first five passages.

2.4. Doubling Time. To assess doubling time, 8 x [10.sup.4] cells/ well were plated using an algorithm available online (http:// DT = t x lg2/(lgNt - lgN0) where N0 is the number of plated cells, Nt is the number of harvested cells, and t is culture time in hours [33].

2.5. Characterization of Leiomyoma Progenitor Cells and Myometrium Progenitor Cells. Cells were characterized by testing plastic adherence [34]. Immunophenotype and multipotency were evaluated as previously described [27]. Briefly, for immunophenotyping, 2.5 x [10.sup.5] cells were stained for 45 min with fluorescein isothiocyanate- (FITC-) conjugated antibodies (Becton Dickinson) against HLA-DR, CD14, CD19, CD34, CD45, CD73, CD90, CD105 OCT4, SOX2, NANOG, and KLF4. Since it is reported [35] that many of the mesenchymal markers are also found in fibroblasts, we analyzed the level of CD9 (Becton Dickinson), which is differently expressed by the two cellular subsets.

For differentiation assay, cells were induced towards osteocytes, chondrocytes, and adipocytes using STEMPRO[R] Osteogenesis and Chondrogenesis and Adipogenesis Kits (GIBCO, Invitrogen), respectively. Osteogenic differentiation was assessed by von Kossa and alkaline phosphatase (ALP) stainings; adipogenic differentiation was tested by Oil Red staining; for chondrogenesis, cells were cultured in pellet culture system and the sections were exposed to a solution of Safranin-O. Cells cultured in MSCGM alone were used as negative controls.

The expression of stemness genes (OCT4, SOX2, NANOG, and KLF4) was analyzed by real-time PCR (RT-PCR) and cytofluorometry as above reported; total RNA was isolated from 1 x [10.sup.6] cells at passage 4th by using 5 PRIME PerfectPure RNA Purification (5 PRIME, Hamburg, Germany) and retrotranscribed in cDNA (GoScript[TM] Reverse Transcription System, Promega, Italy). All samples were tested in triplicate with the housekeeping genes RPLP0 and GAPDH for data normalization. Of the two, GAPDH was the most stable and was used for subsequent normalization. After amplification, melting curves were acquired. Direct detection of PCR products was monitored by measuring the fluorescence produced by SYBR Green I dye (EVA Green PCR Master Mix, Bio-Rad) binding to double strand DNA after every cycle. These measurements were then plotted against cycle numbers. The parameter threshold (Ct) was defined as the number of cycles it took to detect a real signal above background fluorescence.

The amount of mRNA detected in LPCs was calculated as X-fold respect to MPCs (expressed as 1) by the [2.sup.-[DELTA][DELTA]Ct] method [33], where [DELTA]Ct=Ct (gene of interest)--Ct (housekeeping gene) and [DELTA] ([DELTA]Ct) = ACt (LPCs)--[DELTA]Ct (MPCs). X-fold was calculated for the selected genes in all the twelve samples of LPCs and twelve samples of MPCs. Subsequently, mean [+ or -] SD from three independent experiments in triplicates was calculated and displayed. All the primer sequences are reported in Table 1.

2.6. Analysis of MDR1 Expression by Western Blotting. MDR1, a member of the large family of ABC transporters, which confer multidrug resistance on human stem cells, was investigated in the two cell types by Western blotting. Briefly, RIPA buffer (150 mM NaCl, 10 mM Tris, pH 7.2, 0.1% SDS, 1.0% Triton X-100, 5 mM EDTA, pH 8.0) containing protease inhibitor cocktail (Roche Applied Science, Indianapolis, IN, USA) was used for protein extraction from 1 x [10.sup.6] cells at passage 4th. Protein concentration was determined using Bradford reagent (Sigma-Aldrich, Milan, Italy). Total protein extracts (40 [micro]g) were reduced in DTT (0.5 M) for 10 min at 70[degrees]C and samples run on a 4-12% gradient precast NuPAGE Bis-Tris polyacrylamide gel for 1 h at 200 V. Electroblotting was performed using iBlot[R] Dry Blotting System (Invitrogen). Membranes were incubated overnight with primary anti-MRD1 antibody (Santa Cruz Biotechnology, Heidelberg, Germany, 1 : 400) followed by incubation with a secondary antibody conjugated to horseradish peroxidase. Immunoreactive proteins were visualized using a chemiluminescent substrate (Santa Cruz Biotechnology). Anti-[beta]-actin (Santa Cruz Biotechnology) was the endogenous control and normal human lung fibroblasts (NHLFs) were the negative control.

2.7. Expression of [alpha]-SMA, Collagen Type 1, andFibronectin. It is known that even if all mesenchymal stem cells exhibit the original MSC features as defined by the ISCT minimum criteria (spindle-shape, multilineage differentiation, and surface marker expression), the tissue of origin leaves a sort of imprinting in the isolated cells that will express some specific proteins that best characterized their histological source [36-38]. For this reason and to better characterized isolated cells, the expression of [alpha]-SMA, collagen type 1, and fibronectin expression has been tested by indirect immunofluorescence (IIF) and immunocytochemistry (ICC).

For IIF, 1.5 x [10.sup.4] cells at passage 3rd were plated, fixed, permeabilized, and treated overnight with mouse anti-human primary antibodies: anti-collagen type I (1: 1000), anti-cellular fibronectin (1:400), and anti-[alpha]-SMA (1 : 400, all from Sigma-Aldrich, Milano, Italy). Goat antimouse FITC-conjugated antibody (Sigma-Aldrich) was the secondary antibody.

Nuclei were visualized using Hoechst 33342 (SigmaAldrich, 1 : 1000) under a Zeiss Axiovert 200 M inverted microscope (Carl Zeiss, Jena, Germany).

For ICC, 1.5 x [10.sup.4] cells from 1 x [10.sup.6] cells at passage 3rd were plated, fixed, permeabilized, and incubated overnight at 4[degrees]C with anti-collagen type I (1: 1000), anti-cellular fibronectin (1: 400), and anti-[alpha]-SMA (1: 400) monoclonal antibodies. Cells were immunostained using the streptavidin-biotin peroxidase technique (LSAB universal peroxidase kit, Dako Cytomation, Milano, Italy) and incubated with 3,3diaminobenzidine. Slides were counterstained with Mayer's hematoxylin.

2.8. ELISA and RT-PCR Analysis of the Expression of Inflammation-Related Cytokines. Selected cytokines related to acute and chronic inflammation, IL6, IL12, IFN-[gamma], TNF-[alpha], IL2, IL4, IL5, IL13, IL10, TGF-[beta]11, IL17A, and G-CSF, were investigated by RT-PCR (as above reported) and by ELISA (Multi-Analyte ELISArray kit, Qiagen, Milan, Italy) as previously described [39]. Briefly, medium conditioned for 72 hours by each sample of MPCs (1 x [10.sup.5] cells at passage 5th) and LPCs (1 x [10.sup.5] cells at passage 5th) was used for the test. Samples were dispensed into a 96-well microtiter plate and incubated for 2 hours at room temperature. After washing, avidin-HRP-conjugated antibody was added to the plate and incubated for 30 minutes. Finally, captured cytokines were detected by addition of substrate solution. The OD at 450 nm was determined using a microtiter plate reader (Multiskan GO Microplate Reader, Thermo Scientific).

The levels of the cytokines secreted by leiomyoma cells are reported as a percentage of the levels measured in the corresponding myometrial sample. After, mean [+ or -] SD from three independent experiments in triplicates was calculated and displayed. Quantification of mRNA expression in MPCs and LPCs was calculated with the [2.sup.-[DELTA]Ct] method, where [DELTA]Ct=Ct (gene of interest) - Ct (housekeeping gene). [DELTA]Ct was calculated for the selected genes in all the twelve samples of MSCs. Subsequently, mean [+ or -] SD from three independent experiments in triplicates was calculated and displayed.

The expression of other Th1/Th17-related soluble factors (IL22, NFKB1, IL23A, STAT3, CCR5, IL17RA, CX3CL1, CXCL12, and CXCL5) was also assessed by RT-PCR, and the amount of mRNA calculated as above described. All the primer sequences are reported in Table 1.

2.9. Statistical Analysis. Statistical analysis of data from at least 3 independent experiments was performed using SPSS 19.0 software (SPSS Inc., Chicago, IL, USA). All data are mean [+ or -] SD. For two-sample comparisons, significance was calculated by Student's t-test using SPSS 17.0 software. p values [less than or equal to] 0.05 were considered significant.

3. Results

3.1. Sample Collection. Twelve 3-5 mm samples of leiomyoma and 12 samples of normal myometrium were collected. The median size of leiomyomas was 5 cm (range 3-8 cm); 3 of them were anterior, 4 posterior, 2 left lateral, 1 right lateral, and 2 were fundal. The location was subserousal in 2 cases, intramural in 4, and submucosal in the remaining six.

3.2. Cell Isolation and Characterization. Leiomyoma andnormal myometrium samples from the same 12 patients were used to establish cell cultures. Up to the second passage, the cell population was heterogeneous (Figure 1(a), top panels), probably because it was composed by differentiated and undifferentiated cells; cells displayed different morphologies, from rounded to spindle-like and different sizes. After, cells appeared homogeneous, with a fibroblastoid morphology, (Figure 1(a), bottom panels) and also the cytofluorometric analysis revealed the presence of just one cell population. All subsequent experiments were performed separately on each cell sample. Since no differences were detected among the samples from the two tissue groups, no pairwise analysis was necessary and values are the average of 12 samples.

Doubling time was stable up to the 5th passage and almost identical in the two cell groups; it then increased, the increment being greater in myometrium cells (Figure 1(b)).

Evaluation of the stemness criteria identified by Dominici et al. demonstrated that cells adhered to plastic and that they were strongly positive for CD73, CD90, and CD105 and negative for HLA-DR, CD14, CD19, CD34, CD45, and for the key marker CD9 (Table 2).

Cells were also capable of differentiating to osteogenic, chondrogenic, and adipogenic lineages (Figure 2).

Both cell types expressed NANGO, OCT4, SOX2, and KLF4, tested by RT-PCR and cytofluorometry, with a higher expression in leiomyoma cells (Figure 3).

Since all experiments confirmed their undifferentiated status, the two cell types were designated, respectively, as myometrium progenitor cells (MPCs) and leiomyoma progenitor cells (LPCs).

3.3. MDR1, [alpha]-SMA, Collagen Type 1, and Fibronectin Expression. Western blotting demonstrated a reactive band (molecular weight 170 kDa, corresponding to MDR1) in the MPC and LPC lanes. Densitometric analysis revealed that MDR1expression was higher in LPCs (Figure 4), whereas no signal was detected in NHLFs (negative control).

MPCs and LPCs were positive for [alpha]-SMA, collagen type 1, and fibronectin on IIF (Figure 5) and IIC (Figure 6), without significant differences between the two cell types. Although more than 90% of MPCs and LPCs were strongly positive for all three proteins, the staining for collagen type 1 was fainter than the other two.

3.4. Expression Profile of Inflammatory Cytokines. The expression and secretion of inflammation-related cytokines were, respectively, evaluated by RT-PCR (Figure 7(a)) and ELISA (Figure 7(b)).

Compared to MPCs, LPCs exhibited significantly (p < 0.05) higher levels of Th2 pathway cytokines (IL4, IL5, IL10, and IL13), with IL10 showing a 40% increase, and significantly (p < 0.05) lower levels of Th1/Th17 cytokines (IL6, IL12, IL17A, IFN-[gamma], G-CSF, and TGF-[beta]1).

Finally, IL2 and TNF-[alpha] expression was not significantly different between MPCs and LPCs. Since both mRNA levels and ELISA revealed a strong downregulation of Th1/Th17 pathway cytokines in leiomyoma, the expression of other soluble factors belonging to these pathways was assessed by RT-PCR and found to be lower in LPCs (Figure 7(c)).

4. Discussion

Uterine leiomyomas are highly common lesions of unclear etiology. Several hypotheses have been formulated and predisposing factors have been described [40]. Investigation of the factors responsible for the significant plasticity of the uterus has led to the identification of a progenitor/ undifferentiated cell population, prompting the hypothesis that its dysregulation may be implicated in the development of uterine pathologies [8, 41, 42]. Various approaches have been applied to identify and characterize progenitor cells [17-20, 43].

Since inflammation is a recognized mechanism underlying the onset of several tumors, the role of an inflammatory microenvironment has also been explored in leiomyoma development. The overall hypothesis is that leiomyomas are caused in part by an immune milieu that is chronically inflammatory [28]. In addition, the chronic inflammatory state increases estrogen which in turn may increase leiomyoma growth [44]. Chronic inflammation is sustained by specific cytokines secreted by immune, undifferentiated, and tumor cells [25, 26] and seems to be exploited by tumor cells to escape the host immune system [25]. Undifferentiated cells play a central role in the microenvironment and modulate the cellular functions of a variety of immune cells including B and T lymphocytes, natural killer cells, monocytes, and dendritic cells [45-50]. Presumably, this role is operated by a complex interplay of short- and long-range signaling that may entail a wide spectrum of molecular mediators, including soluble cytokines and growth factors [51].

However, a correlation between undifferentiated cells and inflammation in leiomyoma onset has never been explored. In the present work, the issue was investigated through isolation and extensive characterization of undifferentiated progenitor cells from 12 specimens of normal myometrium and 12 leiomyoma samples. Demonstration of a stem-like immunophenotype and of the ability to differentiate into osteoblasts, chondrocytes, and adipocytes enabled their designation as MPCs and LPCs. For the first 5 passages, MPCs and LPCs showed a stable and comparable DT; subsequently, the doubling time increased. This increment was higher in MPCs than in LPCs (75.36 [+ or -] 4.19 versus 61.55 [+ or -] 1.32 hours, resp.). The DT increase corresponded with a reduction in proliferation, which in cultured cells is a sign of senescence; since senescence is greater in more differentiated cells, LPCs seemed to be less differentiated than MPCs. Although this finding disagrees with those of Chang et al. [16], it is consistent with the higher expression by LPCs of stemness genes (SOX2, OCT4, and KLF4) and of MDR1 (as demonstrated by Western blot and densitometric analysis). MDR1 is a member of the ABC transporter family, which is believed to protect stem cells from genetic damage by naturally occurring xenobiotics [52, 53]. ABC family members are considered as stem cell markers and maybe used for stem cell purification; treating cells with specific dyes (Rhodamine123 or Hoechst 33342), stem cells show a reduced retention by the presence of this transmembrane proteins capable of pumping these dyes out of the cell [54]. Different roles have been attributed to MDR1, such as drug efflux and protection of cells against apoptotic cell death induced by a variety of causes, and to modulate signal transduction pathways enhancing cell survival [54].

Progenitor cells were further characterized by IIF and ICC through the expression of [alpha]-SMA, collagen type 1, and fibronectin. Their expression was strong and similar in MPCs and LPCs, although staining for collagen type 1 was weaker. It is now well accepted that progenitor/mesenchymal cells are a very heterogeneous reservoir of cells; even if cells satisfied all the three essential criteria identified by Dominici, progenitor displays biologic properties that may differ according to the tissue of derivation. Specific molecules, receptors that characterized a particular tissue, may be expressed by undifferentiated cells derived from it. In this case, myometrium is characterized by abundant amounts of [alpha]-SMA, collagen type 1, and fibronectin. We found a detectable expression of these three molecules at mRNA level; interestingly, progenitors from leiomyoma do not hyperexpress these factors compared to cells from myometrium even if it is known their involvement in fibroid development. This apparent contradiction may reside in the fact that accumulation of extracellular matrix (ECM) in leiomyoma may be the result of a dysregulated proliferation of cells; in fibroids, ECM is more abundant because of a more elevated number of producing cells. In vitro experiments were performed using the same amount of cells derived from myometrium and leiomyoma [55]. The expression of collagen type 1 was weaker than the other two molecules; it may depend by the low secretion of TGF-[beta]1 observed by ELISA test. TGF-[beta]1 is in fact known as a great promoter of collagen type 1 production [56, 57].

As regards the role of inflammation, it is well accepted that leiomyoma onset may correlate with active inflammation [21] and that undifferentiated cells participate in microenvironment formation. For this reason, a panel of 12 cytokines related to acute and chronic inflammation was evaluated in LPCs and MPCs as mRNA expression and secretion.

Although IL6, TNF-[alpha], IFN-[gamma], G-CSF, and TGF-[beta]1, which have been implicated in leiomyoma development [58, 59], were expressed in both cell types, the most notable finding was the significantly different expression of Th2 and Th1/Th17 pathways in LPCs and MPCs. Indeed, LPCs exhibited a significantly greater expression of IL4, IL5, IL10, and IL13 (Th2 pathway) and a significantly lower expression of Th1/Th17 pathway cytokines. In particular, they secreted less TGF-[beta]1 which, alone or combined with IL6, is involved in the differentiation of naive T-cells to Treg T-cells and Th17 T-cells, which in turn secrete TGF-[beta]1 and IL17. Treg T-cells are actively involved in inhibiting tissue inflammation, and their suppression may enhance the maintenance of the inflammatory microenvironment that favors leiomyoma development. IL12 and IFN-[gamma], which allow differentiation of naive cells to Th1 T-cells, were lower in LPCs, whereas secretion of IL4, IL5, and IL13, which drive the differentiation to Th2 T-cells, was lower in MPCs; this also applied to IL10, which is subsequently produced.

To lend support to the downregulation of Th1/Th17 pathway cytokines in LPCs, other soluble factors of the same subgroups (IL22, NFKB, IL23A, STAT3, CCR5, IL17A, IL17RA, CXCL12, CX3CL1, and CXCL5) were evaluated by RT-PCR. This panel of molecules with different functions (chemokines, cytokines, transcription factors, and signaling pathway molecules) provided a general picture of the involvement of Th1/Th17 pathways. All molecules were downregulated in LPCs, confirming the upregulation of the Th2 profile. Th2 cells and cytokines are associated with chronic inflammation, whereas the Th1/Th17 pathways are related to acute inflammation. The upregulation of the Th2 pathway in LPCs may reflect a protracted inflammatory state that is maintained by paracrine effect exerted also by undifferentiated cells, which create a stroma favoring leiomyoma development.

These observations suggest a relationship between chronic myometrial inflammation and uterine leiomyomatosis, infertility, and adverse obstetric outcomes [60]. Indeed, a chronic inflammatory reaction induced by fibroids and altered myometrium contractility may hinder embryo implantation, affecting fertility [61-63]. Among the mechanisms invoked to explain the increased myometrial contractility are an excess of cytokines, growth factors, neurotensin, neuropeptides, enkephalin, oxytocin modulators, and chronic inflammation of the fibroid capsule [64-66].

Alterations in the endometrial-myometrial junction (EMJ) seem to play a key role in implantation failure and recurrent miscarriage. The EMJ, the inner third of the myometrium adjacent to the endometrium, provides macrophages and uterine natural killer cells, which are essential for endometrial decidualization in the midluteal window of implantation [67]. It is conceivable that intramural/submucosal fibroids not only physically disrupt the EMJ [68-70] but also cause chronic inflammation, steroid receptor alterations, and ultimately implantation failure. A chronic proinflammatory effect exerted by leiomyoma progenitor cells may explain why even small myomas or early-stage diffuse leiomyomatosis hamper embryo implantation. Inflammatory stimuli also seem to alter progesterone receptor activation; hence, transrepressive activity in myometrial cells, providing support for the hypothesis that tissue inflammation, may be involved in miscarriage and preterm delivery [71].

In conclusion, the present data suggest that (i) progenitor cells are found both in leiomyomas and normal myometrium, (ii) these progenitors show a differential expression of cytokines related to acute and chronic inflammation, and (iii) the upregulation of cytokines related to chronic inflammation in leiomyoma progenitors may favor the formation of a microenvironment suitable for leiomyoma onset and development.

Conflicts of Interest

The authors declare that there is no conflict of interest regarding the publication of this article.


[1] C. L. Walker and E. A. Stewart, "Uterine fibroids: the elephant in the room," Science, vol. 308, no. 5728, pp. 1589-1592, 2005.

[2] S. Okolo, "Incidence, aetiology and epidemiology of uterine fibroids," Best Practice & Research Clinical Obstetrics & Gynaecology, vol. 22, no. 4, pp. 571-588, 2008.

[3] E. A. Stewart, "Uterine fibroids," The Lancet, vol. 357, no. 9252, pp. 293-298, 2001.

[4] W. H. Parker, "Etiology, symptomatology, and diagnosis of uterine myomas," Fertility and Sterility, vol. 87, no. 4, pp. 725-736, 2007.

[5] A. Ciavattini, N. Clemente, G. Delli Carpini, J. Di Giuseppe, S. R. Giannubilo, and A. L. Tranquilli, "Number and size of uterine fibroids and obstetric outcomes," The Journal of MaternalFetal & Neonatal Medicine, vol. 28, no. 4, pp. 484-488, 2015.

[6] S. E. Bulun, "Uterine fibroids," The New England Journal of Medicine, vol. 369, no. 14, pp. 1344-1355, 2013.

[7] P. Zhang, C. Zhang, J. Hao et al., "Use of X-chromosome inactivation pattern to determine the clonal origins of uterine leiomyoma and leiomyosarcoma," Human Pathology, vol. 37, no. 10, pp. 1350-1356, 2006.

[8] R. A. Canevari, A. Pontes, F. E. Rosa, C. A. Rainho, and S. R. Rogatto, "Independent clonal origin of multiple uterine leiomyomas that was determined by X chromosome inactivation and microsatellite analysis," American Journal of Obstetrics & Gynecology, vol. 193, no. 4, pp. 1395-1403, 2005.

[9] M. M. Carneiro, "Stem cells and uterine leiomyomas: what is the evidence?," JBRA Assisted Reproduction, vol. 20, no. 1, pp. 33-37, 2016.

[10] R. E. Blake, "Leiomyomata uteri: hormonal and molecular determinants of growth," Journal of the National Medical Association, vol. 99, no. 10, pp. 1170-1184, 2007.

[11] A. Mas, I. Cervello, C. Gil-Sanchis, and C. Simon, "Current understanding of somatic stem cells in leiomyoma formation," Fertility and Sterility, vol. 102, no. 3, pp. 613-620, 2014.

[12] A. Mas, I. Cervello, A. Fernandez-Alvarez et al., "Overexpression of the truncated form of high mobility group a proteins (HMGA2) in human myometrial cells induces leiomyomalike tissue formation," MHR: Basic Science of Reproductive Medicine, vol. 21, no. 4, pp. 330-338, 2015.

[13] T. Kurita, P. S. Cooke, and G. R. Cunha, "Epithelial-stromal tissue interaction in paramesonephric (mullerian) epithelial differentiation," Developmental Biology, vol. 240, no. 1, pp. 194-211,2001.

[14] G. P. Flake, J. Andersen, and D. Dixon, "Etiology and pathogenesis of uterine leiomyomas: a review," Environmental Health Perspectives, vol. 111, no. 8, pp. 1037-1054, 2003.

[15] T. Maruyama, K. Miyazaki, H. Masuda, M. Ono, H. Uchida, and Y. Yoshimura, "Review: human uterine stem/progenitor cells: implications for uterine physiology and pathology," Placenta, vol. 34, pp. S68-S72, 2013.

[16] H. L. Chang, T. N. Senaratne, L. Zhang et al., "Uterine leiomyomas exhibit fewer stem/progenitor cell characteristics when compared with corresponding normal myometrium," Reproductive Sciences, vol. 17, no. 2, pp. 158-167, 2010.

[17] M. Ono, W. Qiang, V. A. Serna et al., "Role of stem cells in human uterine leiomyoma growth," PLoS One, vol. 7, no. 5, article e36935, 2012.

[18] M. Ono, P. Yin, A. Navarro et al., "Paracrine activation of WNT/[beta]-catenin pathway in uterine leiomyoma stem cells promotes tumor growth," Proceedings of the National Academy of Sciences of the United States of America, vol. 110, no. 42, pp. 17053-17058, 2013.

[19] M. Ono, P. Yin, A. Navarro et al., "Inhibition of canonical WNT signaling attenuates human leiomyoma cell growth," Fertility and Sterility, vol. 101, no. 5, pp. 1441-1449.e1, 2014.

[20] P. Yin, M. Ono, M. B. Moravek et al., "Human uterine leiomyoma stem/progenitor cells expressing CD34 and CD49b initiate tumors in vivo," The Journal of Clinical Endocrinology & Metabolism, vol. 100, no. 4, pp. E601-E606, 2015.

[21] G. Wegienka, "Are uterine leiomyoma a consequence of a chronically inflammatory immune system?," Medical Hypotheses, vol. 79, no. 2, pp. 226-231, 2012.

[22] O. Protic, P. Toti, M. S. Islam et al., "Possible involvement of inflammatory/reparative processes in the development of uterine fibroids," Cell and Tissue Research, vol. 364, no. 2, pp. 415-427, 2016.

[23] M. S. Islam, M. M. Akhtar, A. Ciavattini et al., "Use of dietary phytochemicals to target inflammation, fibrosis, proliferation, and angiogenesis in uterine tissues: promising options for prevention and treatment of uterine fibroids?," Molecular Nutrition & Food Research, vol. 58, no. 8, pp. 1667-1684, 2014.

[24] G. Weiss, L. T. Goldsmith, R. N. Taylor, D. Bellet, and H. S. Taylor, "Inflammation in reproductive disorders," Reproductive Sciences, vol. 16, no. 2, pp. 216-229, 2009.

[25] E. Elinav, R. Nowarski, C. A. Thaiss, B. Hu, C. Jin, and R. A. Flavell, "Inflammation-induced cancer: crosstalk between tumours, immune cells and microorganisms," Nature Reviews Cancer, vol. 13, no. 11, pp. 759-771, 2013.

[26] S. Ma, N. Xie, W. Li, B. Yuan, Y. Shi, and Y. Wang, "Immunobiology of mesenchymal stem cells," Cell Death & Differentiation, vol. 21, no. 2, pp. 216-225, 2014.

[27] M. Orciani, R. Lazzarini, M. Scartozzi et al., "The response of breast cancer cells to mesenchymal stem cells: a possible role of inflammation by breast implants," Plastic and Reconstructive Surgery, vol. 132, no. 6, pp. 899e-910e, 2013.

[28] M. Orciani, G. Sorgentoni, M. Torresetti, R. Di Primio, and G. Di Benedetto, "MSCs and inflammation: new insights into the potential association between ALCL and breast implants," Breast Cancer Research and Treatment, vol. 156, no. 1, pp. 65-72, 2016.

[29] M. Orciani, G. Sorgentoni, F. Olivieri, M. Mattioli-Belmonte, G. Di Benedetto, and R. Di Primio, "Inflammation by breast implants and adenocarcinoma: not always a bad company," Clinical Breast Cancer, vol. 17, no. 4, pp. 286-292, 2017.

[30] P. Ciarmela, M. S. Islam, F. M. Reis et al., "Growth factors and myometrium: biological effects in uterine fibroid and possible clinical implications," Human Reproduction Update, vol. 17, no. 6, pp. 772-790, 2011.

[31] N. Chegini, "Proinflammatory and profibrotic mediators: principal effectors of leiomyoma development as a fibrotic disorder," Seminars in Reproductive Medicine, vol. 28, no. 3, pp. 180-203, 2010.

[32] M. S. Islam, O. Protic, P. Stortoni et al., "Complex networks of multiple factors in the pathogenesis of uterine leiomyoma," Fertility and Sterility, vol. 100, no. 1, pp. 178-193, 2013.

[33] C. Mariotti, R. Lazzarini, M. Nicolai et al., "Comparative study between amniotic-fluid mesenchymal stem cells and retinal pigmented epithelium (RPE) stem cells ability to differentiate towards RPE cells," Cell and Tissue Research, vol. 362, no. 1, pp. 21-31,2015.

[34] M. Dominici, K. le Blanc, I. Mueller et al., "Minimal criteria for defining multipotent mesenchymal stromal cells. The International Society for Cellular Therapy position statement," Cytotherapy, vol. 8, no. 4, pp. 315-317, 2006.

[35] S. Halfon, N. Abramov, B. Grinblat, and I. Ginis, "Markers distinguishing mesenchymal stem cells from fibroblasts are downregulated with passaging," Stem Cells and Development, vol. 20, no. 1, pp. 53-66, 2011.

[36] S. Barlow, G. Brooke, K. Chatterjee et al., "Comparison of human placenta- and bone marrow-derived multipotent mesenchymal stem cells," Stem Cells and Development, vol. 17, no. 6, pp. 1095-1108, 2008.

[37] R. Izadpanah, C. Trygg, B. Patel et al., "Biologic properties of mesenchymal stem cells derived from bone marrow and adipose tissue," Journal of Cellular Biochemistry, vol. 99, no. 5, pp. 1285-1297, 2006.

[38] R. A. Panepucci, J. L. C. Siufi, W. A. Silva Jr. et al., "Comparison of gene expression of umbilical cord vein and bone marrow-derived mesenchymal stem cells," Stem Cells, vol. 22, no. 7, pp. 1263-1278, 2004.

[39] M. Orciani, A. Campanati, M. Caffarini et al., "T helper (Th)1, Th17 and Th2 imbalance in mesenchymal stem cells of adult patients with atopic dermatitis: at the origin of the problem," British Journal of Dermatology, vol. 176, no. 6, pp. 1569-1576, 2017.

[40] M. M. McWilliams and V. M. Chennathukuzhi, "Recent Advances in Uterine Fibroid Etiology," Seminars in Reproductive Medicine, vol. 35, no. 2, pp. 181-189, 2017.

[41] C. E. Gargett, H. P. T. Nguyen, and L. Ye, "Endometrial regeneration and endometrial stem/progenitor cells," Reviews in Endocrine and Metabolic Disorders, vol. 13, no. 4, pp. 235-251, 2012.

[42] S. A. Hubbard, A. M. Friel, B. Kumar, L. Zhang, B. R. Rueda, and C. E. Gargett, "Evidence for cancer stem cells in human endometrial carcinoma," Cancer Research, vol. 69, no. 21, pp. 8241-8248, 2009.

[43] I. Cervello, C. Gil-Sanchis, A. Mas et al., "Human endometrial side population cells exhibit genotypic, phenotypic and functional features of somatic stem cells," PLoS One, vol. 5, no. 6, article e10964, 2010.

[44] F. Modugno, R. B. Ness, C. Chen, and N. S. Weiss, "Inflammation and endometrial cancer: a hypothesis," Cancer Epidemiology Biomarkers & Prevention, vol. 14, no. 12, pp. 2840-2847, 2005.

[45] A. Corcione, F. Benvenuto, E. Ferretti et al., "Human mesenchymal stem cells modulate B-cell functions," Blood, vol. 107, no. 1, pp. 367-372, 2006.

[46] J. Plumas, L. Chaperot, M. J. Richard, J. P. Molens, J. C. Bensa, and M. C. Favrot, "Mesenchymal stem cells induce apoptosis of activated T cells," Leukemia, vol. 19, no. 9, pp. 1597-1604, 2005.

[47] P. A. Sotiropoulou, S. A. Perez, A. D. Gritzapis, C. N. Baxevanis, and M. Papamichail, "Interactions between human mesenchymal stem cells and natural killer cells," Stem Cells, vol. 24, no. 1, pp. 74-85, 2006.

[48] G. M. Spaggiari, A. Capobianco, S. Becchetti, M. C. Mingari, and L. Moretta, "Mesenchymal stem cell-natural killer cell interactions: evidence that activated NK cells are capable of killing MSCs, whereas MSCs can inhibit IL-2-induced NKcell proliferation," Blood, vol. 107, no. 4, pp. 1484-1490, 2006.

[49] S. Beyth, Z. Borovsky, D. Mevorach et al., "Human mesenchymal stem cells alter antigen-presenting cell maturation and induce T-cell unresponsiveness," Blood, vol. 105, no. 5, pp. 2214-2219, 2005.

[50] X. X. Jiang, Y. Zhang, B. Liu et al., "Human mesenchymal stem cells inhibit differentiation and function of monocyte-derived dendritic cells," Blood, vol. 105, no. 10, pp. 4120-4126, 2005.

[51] C. W. Park, K. S. Kim, S. Bae et al., "Cytokine secretion profiling of human mesenchymal stem cells by antibody array," International Journal of Stem Cells, vol. 2, no. 1, pp. 59-68, 2009.

[52] E. P. L. M. de Grouw, M. H. G. P. Raaijmakers, J. B. Boezeman et al., "Preferential expression of a high number of ATP binding cassette transporters in both normal and leukemic CD34+CD38- cells," Leukemia, vol. 20, no. 4, pp. 750-754, 2006.

[53] A. Shervington and C. Lu, "Expression of multidrug resistance genes in normal and cancer stem cells," Cancer Investigation, vol. 26, no. 5, pp. 535-542, 2008.

[54] K. D. Bunting, "ABC transporters as phenotypic markers and functional regulators of stem cells," Stem Cells, vol. 20, no. 1, pp. 11-20, 2002.

[55] M. Iwahashi, Y. Muragaki, M. Ikoma et al., "Immunohistochemical analysis of collagen expression in uterine leiomyomata during the menstrual cycle," Experimental and Therapeutic Medicine, vol. 2, no. 2, pp. 287-290, 2011.

[56] X. M. Tang, Q. Dou, Y. Zhao, F. McLean, J. Davis, and N. Chegini, "The expression of transforming growth factorbeta s and TGF-beta receptor mRNA and protein and the effect of TGF-beta s on human myometrial smooth muscle cells in vitro," MHR: Basic Science of Reproductive Medicine, vol. 3, no. 3, pp. 233-240, 1997.

[57] I. Sozen and A. Arici, "Interactions of cytokines, growth factors, and the extracellular matrix in the cellular biology of uterine leiomyomata," Fertility and Sterility, vol. 78, no. 1, pp. 1-12, 2002.

[58] P. Hatthachote and J. I. Gillespie, "Complex interactions between sex steroids and cytokines in the human pregnant myometrium: evidence for an autocrine signaling system at term," Endocrinology, vol. 140, no. 6, pp. 2533-2540, 1999.

[59] O. Kurachi, H. Matsuo, T. Samoto, and T. Maruo, "Tumor necrosis factor-a expression in human uterine leiomyoma and its down-regulation by progesterone," The Journal of Clinical Endocrinology & Metabolism, vol. 86, no. 5, pp. 2275-2280, 2001.

[60] Practice Committee of the American Society for Reproductive Medicine, "Myomas and reproductive function," Fertility and Sterility, vol. 86, no. 5, Supplement 1, pp. S194-S199, 2006.

[61] B. W. Rackow and H. S. Taylor, "Submucosal uterine leiomyomas have a global effect on molecular determinants of endometrial receptivity," Fertility and Sterility, vol. 93, no. 6, pp. 2027-2034, 2010.

[62] A. Kido, S. M. Ascher, W. Hahn et al., "3 T MRI uterine peristalsis: comparison of symptomatic fibroid patients versus controls," Clinical Radiology, vol. 69, no. 5, pp. 468-472, 2014.

[63] O. Yoshino, O. Nishii, Y. Osuga et al., "Myomectomy decreases abnormal uterine peristalsis and increases pregnancy rate," The Journal of Minimally Invasive Gynecology, vol. 19, no. 1, pp. 63-67, 2012.

[64] A. Malvasi, C. Cavallotti, G. Nicolardi et al., "NT, NPY and PGP 9.5 presence in myomeytrium and in fibroid pseudocapsule and their possible impact on muscular physiology," Gynecological Endocrinology, vol. 29, no. 2, pp. 177-181, 2013.

[65] J. Ben-Nagi, J. Miell, D. Mavrelos, J. Naftalin, C. Lee, and D. Jurkovic, "Endometrial implantation factors in women with submucous uterine fibroids," Reproductive BioMedicine Online, vol. 21, no. 5, pp. 610-615, 2010.

[66] H. Cakmak and H. S. Taylor, "Implantation failure: molecular mechanisms and clinical treatment," Human Reproduction Update, vol. 17, no. 2, pp. 242-253, 2011.

[67] D. C. Sinclair, A. Mastroyannis, and H. S. Taylor, "Leiomyoma simultaneously impair endometrial BMP-2-mediated decidualization and anticoagulant expression through secretion of TGF-[beta]3," The Journal of Clinical Endocrinology & Metabolism, vol. 96, no. 2, pp. 412-421, 2011.

[68] K. Kitaya and T. Yasuo, "Leukocyte density and composition in human cycling endometrium with uterine fibroids," Human Immunology, vol. 71, no. 2, pp. 158-163, 2010.

[69] A. Tocci, E. Greco, and F. M. Ubaldi, "Adenomyosis and 'endometrial-subendometrial myometrium unit disruption disease' are two different entities," Reproductive BioMedicine Online, vol. 17, no. 2, pp. 281-291, 2008.

[70] P. Purohit and K. Vigneswaran, "Fibroids and infertility," Current Obstetrics and Gynecology Reports, vol. 5, no. 2, pp. 81-88, 2016.

[71] G. A. Peters, L. Yi, Y. Skomorovska-Prokvolit et al., "Inflammatory stimuli increase progesterone receptor-a stability and transrepressive activity in myometrial cells," Endocrinology, vol. 158, no. 1, pp. 158-169, 2017.

Monia Orciani [ID] (7) Miriam Caffarini [ID] (7) Alessandra Biagini, [ID] (2) Guendalina Lucarini (7) Giovanni Delli Carping, [ID] (2) Antonella Berretta [ID], (3) Roberto Di Primio [ID], (1) and Andrea Ciavattini [ID] (2)

(1) Department of Clinical and Molecular Sciences and Histology, Universita Politecnica delle Marche, 60126 Ancona, Italy

(2) Department of Clinical Science, Universita Politecnica delle Marche, 60126 Ancona, Italy

(3) Clinic of Immunology, Azienda Ospedali Riuniti di Ancona, 60126 Ancona, Italy

Correspondence should be addressed to Roberto Di Primio;

Received 5 December 2017; Revised 12 March 2018; Accepted 4 April 2018;

Published 13 May 2018

Academic Editor: Dunfang Zhang

Caption: Figure 1: Cell morphology and doubling time. (a) Phase-contrast images of myometrium progenitor cells (MPCs, left) and leiomyoma progenitor cells (LPCs, right) at 2nd (top) and 4th (bottom) passage of culture. Scale bar = 100 [micro]m. (b) Doubling time was calculated over 21 days (8th passage). Data are mean [+ or -] SD of experiments performed on 12 samples. *p < 0.05 LPCs versus MPCs.

Caption: Figure 2: Multilineage differentiation of MPCs and LPCs. Representative images of differentiation experiments. Osteogenic differentiation: ALP staining (top); chondrogenic differentiation: acid mucopolysaccharide coloration with Safranin-O (center); adipocyte differentiation: Oil Red staining (bottom). No differences were noted among different leiomyoma and myometrium samples. Scale bar =100 [micro]m. MPCs: myometrium progenitor cells; LPCs: leiomyoma progenitor cells.

Caption: Figure 3: OCT4, SOX2, NANOG, and KLF4 expression. Selected markers of self-renewal and differentiation potential (OCT4, SOX2, NANOG, and KLF4) were evaluated by RT-PCR (a) and cytofluorometry (b). For PCR analysis, the expression levels measured in LPCs are considered as X-fold with respect to MPCs (considered as 1). Data are mean [+ or -] SD of analyses performed in 12 different MPC and LPC cultures, upon three independent experiments in triplicates. *p < 0.05 LPCs versus MPCs. For cytofluorometric analysis, representative FACScan analyses of cell-surface antigen expression, as indicated. Black histograms refer to the MPCs and red histograms refer to LPCs.

Caption: Figure 4: Western blots and densitometric analyses of MDR1 expression. (Top) representative Western blot gels showing the bands of MDR1 and of the endogenous control [beta]-actin. (Bottom) densitometric analyses of the immunoreactive bands (quantified as MDR1/[beta]-actin bands in corresponding samples and expressed as arbitrary units, A.U.). Data are mean [+ or -] SD of analyses performed in MPCs and LPCs from the 12 patients. *p < 0.05 LPCs versus MPCs. MPCs: myometrium progenitor cells; LPCs: leiomyoma progenitor cells.

Caption: Figure 5: Indirect immunofluorescence analysis of [alpha]-SMA, collagen type 1, and fibronectin. A secondary FITC-conjugated antibody was used after incubation with the primary antibodies. Nuclei were counterstained with Hoechst 33342. Myometrium progenitor cells (MPCs) and leiomyoma progenitor cells (LPCs) showed a similarly strong positivity for [alpha]-SMA and fibronectin, whereas collagen type 1 expression was fainter. Differences between MPCs and LPCs were not significant (x200 original magnification).

Caption: Figure 6: Immunocytochemical analysis of [alpha]-SMA, collagen type 1, and fibronectin. Compared to the negative control (secondary antibody alone), the primary antibodies induce brownish staining in myometrium progenitor cells (MPCs) and leiomyoma progenitor cells (LPCs). The reaction was weaker for collagen type 1 than for [alpha]-SMA and fibronectin. Differences between MPCs and LPCs were not significant (immunoperoxidase, x400 original magnification).

Caption: Figure 7: Expression of selected cytokines in myometrium progenitor cells (MPCs) and leiomyoma progenitor cells (LPCs). (a) Quantification of mRNA expression in MPCs and LPCs was calculated with the [2.sup.-[DELTA]Ct] method, where [DELTA]Ct = Ct (gene of interest) - Ct (housekeeping gene). [DELTA]Ct was calculated for the selected genes on 12 different cultures. Subsequently, mean [+ or -] SD from three independent experiments in triplicates was calculated for LPCs and displayed. *p < 0.05 LPCs versus MPCs. (b) ELISA test; the levels measured in MPCs were considered as 100% and those detected in LPCs accordingly calculated; *p < 0.05 LPCs versus MPCs. (c) Selected Th1/Th17 pathway molecules evaluated by RT-PCR. Quantification of mRNA expression in MPCs and LPCs was calculated with the [2.sup.-[DELTA]Ct] method, where [DELTA]Ct = Ct (gene of interest) - Ct (housekeeping gene). [DELTA]Ct was calculated for the selected genes on 12 different cultures. Subsequently, mean [+ or -] SD from three independent experiments in triplicates was calculated for LPCs and displayed. *p < 0.05.
Table 1: Primer sequences.

Gene           Primers

               Reverse 5 '-TGGGATTTCCATTGATGACAAGC-3'

               Reverse 5'-TCAGCAAGTGGGAAGGTGTAATC-3'

               Reverse 5'-CTGGATGTTCTGGGTCTGGT-3'

SOX2           Forward 5'-ACACCAATCCCATCCACACT-3'
               Reverse 5 '-GCAAACTTCCTGCAAAGCTC-3'

OCT4           Forward 5'-AGCGAACCAGTATCGAGAAC-3'
               Reverse 5-'TTACAGAACCACACTCGGAC-3'

KLF4           Forward 5'-CCCACACAGGTGAGAAACCT-3'
               Reverse 5'-ATGTGTAAGGCGAGGTGGTC-3'

               Reverse 5'-TTAAAAATGCAAGTAAGTTTGCTG-3'


IL4            Forward 5'-GAAGAGAGGTGCTGATTG-3'
               Reverse 5 -GGAAGAACAGAGGGGGAAG-3

               Reverse 5'-AAGCAGTGCCAAGGTCTCTTTCAC-3'

IL6            Forward 5'-ATTCTGCGCAGCTTTAAGGA-3'
               Reverse 5'-AACAACAATCTGAGGTGCCC-3'

               Reverse 5'-GAGATGCCTTCAGCAGAGTG-3'

IL12           Forward 5'-GGAGTACCCTGACACCTG-3'
               Reverse 5'-AGATGACCGTGGCTGAGG-3'

IL13           Forward 5'-CCAGAAGGCTCCGCTCTGCAA-3'
               Reverse 5'-GTGCGGGCAGAATCCGCTCA-3'

IL17A          Forward 5' -TCACAATCCCACGAAATCCAG-3'
               Reverse 5'-GTGAGGTGGATCGGTTGTAG-3'

TGF-[beta]     Forward 5'-GGCCAGATCCTGTCCAAGC-3'
               Reverse 5'-GTGGGTTTCCACCATTAGCAC-3'

               Reverse 5'-AAGCTGTAGGCCCCAGTGAGTT-3'

               Reverse 5'-TTACTGGGATGCTCTTCGAC-3'

               Reverse 5'-CAGCTTGTAGGTGGCACACTC-3'

               Reverse 5'-CGATGAGTGTGATGAGGCCATA-3'

IL-22          Forward 5'-TTGAGGTGTCCAACTTCCAGCA-3'
               Reverse 5'-AGCCGGACGTCTGTGTTGTTA-3'

IL23           Forward 5'-CGTCTCCTTCTCCGCTTCAA-3'
               Reverse 5'-ACCCGGGCGGCTACAG-3'

NFKB           Forward 5 '-CACTGCTCAGGTCCACTGTC-3'
               Reverse 5'-CTGTCACTATCCCGGAGTTCA-3'

STAT3          Forward 5'-GAGGACTGAGCATCGAGCA-3'

               Reverse 5,-CCTGTGCCTCTTCTTCTCATTTCG-3'

               Reverse 5'-GGCCTCAGGGTCCAAAGACA-3'

CXCL5          Forward 5'-TGGACGGTGGAAACAAGG-3'
               Reverse 5'-CTTCCCTGGGTTCAGAGAC-3'

               Reverse 5'-CTTTAGCTTCGGGTCAATGC-3'

Table 2: Flow cytometry results of progenitor cells.

                  Myometrium    Leiomyoma

HLA-DR            --            --
CD14              --            --
CD19              --            --
CD34              --            --
CD45              --            --
CD73              +             +
CD90              +             +
CD105             +             +
CD9               --            --

Positive immunolabelling (+) was defined as a level of fluorescence
> 90% of the corresponding isotype-matched control antibodies.
Percentages < 2% were considered negative (-). No statistically
significant differences were found among the twelve cultures.
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Title Annotation:Research Article
Author:Orciani, Monia; Caffarini, Miriam; Biagini, Alessandra; Lucarini, Guendalina; Carpini, Giovanni Dell
Publication:Stem Cells International
Date:Jan 1, 2018
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