Mast cell chymase promotes angiogenesis and lymphangiogenesis mediated by activation of melanoma inhibitory activity gene family members in oral squamous cell carcinoma
- Authors:
- Published online on: February 20, 2020 https://doi.org/10.3892/ijo.2020.4996
- Pages: 1093-1100
Abstract
Introduction
Oral squamous cell carcinoma (OSCC) is a common form of cancer, with an estimated 447,751 new cases and 228,389 deaths reported worldwide in 2018, which represents ~2.5 and ~2.4% of all cancer incidence and mortality, respectively (1). In the USA, 53,000 new cases and 10,860 deaths from OSCC are estimated for 2019 (2). OSCC also exhibits high frequency in various other countries, including India, Sri Lanka, Pakistan, Afghanistan and Papua New Guinea; indeed, OSCC is the leading cause of cancer-related death among males in India and Sri Lanka (1). The incidence of OSCC, and lip and pharyngeal cancers is expected to increase in the future, reaching 855,900 new cases per year in 2035 due to changes in demographics (3). The overall 5-year survival rates of OSCC have not changed in the past 30 years, and remain <50% (4). Therefore, early detection and treatment, and the clarification of the molecular details of OSCC remain essential to address this increasing health problem.
Considerable attention has been paid to the role of mast cells (MCs) in the tumor microenvironment (TME) (5). Human MCs are a rich source of the serine proteases tryptase and chymase; MCs that only contain tryptase are classified as MCT, whereas those that contain both tryptase and chymase are classified as MCTC (5,6). Chymase acts indirectly to evoke angiogenesis through the activation of vascular endothelial growth factor (VEGF)-A, via the conversion of angiotensin I (Ang I) to Ang II and cleavage of matrix metalloproteinase-9 (MMP-9) (5). An increase in MCT count is closely associated with angiogenesis, cellular proliferation and poor prognosis in various types of cancer (5,6). MCT also promote lymphangio-genesis by releasing VEGF-C and VEGF-D (7,8), as well as overall immunosuppression (5,9). However, previous studies focusing on the relationship between MCTC and tumors have been inconclusive. The accumulation of MCTC appears to be significantly associated with angiogenesis, nodal metastasis and/or poor prognosis in lung cancer (10-13), and T grade, clinical stage, angiogenesis and poor prognosis in gastric cancer (14). In contrast, low MCTC density is closely related to poor prognosis in melanoma (15) and colon cancer (16), and a more favorable immunophenotype in breast carcinoma (17). A strong negative correlation has also observed between melanoma proliferation and MC infiltration (6,18). Therefore, the detailed roles of MCTC and chymase in various malignancies remain controversial.
Members of the melanoma inhibitory activity (MIA) gene family include MIA, MIA2, transport and Golgi organization protein 1 (TANGO or MIA3), and otoraplin. These secreted proteins share 34-45% amino acid and 47-59% cDNA sequence homology, and also possess a highly conserved Src homology 3-like domain (4,19). Our previous studies reported that MIA gene family members act as oncogenes in OSCC by acting on the TME (4,20-24). One of the major functions of MIA and MIA2 in OSCC is the induction of angiogenesis and lymphangiogenesis through the activation of VEGF-A, VEGF-C and VEGF-D, as well as the general suppression of tumor immunity (4,20-22,24). TANGO is also associated with microvessel density (MVD) and lymph vessel density (LVD) through the activation of platelet-derived growth factor β polypeptide (PDGFB) (4,23). MCTC in the TME may enhance the vasculogenic and immunosuppressive activity of the MIA gene family in OSCC. Thus, in the present study, the roles of MCTC and MIA gene family activation in OSCC were investigated.
Materials and methods
Tumor samples
Tissues were fixed over 96 h with formalin at 4˚C. Formalin-fixed, paraffin-embedded (FFPE) specimens of 93 primary OSCC (43 males and 50 females; age range, 45-89 years; mean, 66.8±10.7 years) without preoperative therapy were used in the present study. All specimens were selected at random from the Nara Medical University Hospital. Written informed consent was obtained from all individuals for the use of their tissue specimens. Tumor staging and the histological grade of OSCC were based on the Union for International Cancer Control (UICC) TNM classification system (8th edition) (25) and the World Health Organization criteria (26), respectively. Medical records and prognostic follow-up data were obtained from the patient database managed by the hospital. The present study was conducted following a protocol approved by the Medical Ethical Committee of the Nara Medical University (approval no. 719). The study protocol using human samples was performed according to the ethical standards stated in the Declaration of Helsinki.
Immunohistochemistry
Consecutive 3-µm sections were cut from each block, and immunohistochemistry was performed. An immunoperoxidase technique was performed following antigen retrieval with microwave treatment (95˚C) in citrate buffer (pH 6.0) for 45 min. Sections were pretreated with 3% H2O2-methanol to block endogenous peroxidase activity at room temperature, and specimens were incubated in 10% skim milk solution (Morinaga Milk Industry Co., Ltd.) for 20 min at room temperature to avoid false-positive antibody reactions. Antibodies (all diluted to 0.5 µg/ml) specific for MC chymase (cat. no. ab2377; Abcam), CD34 (cat. no. M7165; Dako; Agilent Technologies, Inc.), used as a marker of endothelial cells, and the lymphatic vessel endothelial hyaluronan receptor 1 (LYVE1) antibody (cat. no. ab10278; Abcam), a marker for lymphatic endothelial cells, were used. After incubation at room temperature for 2 h, sections were incubated with polyclonal anti-goat/mouse/rabbit Multi-Link secondary antibody (1:200; cat. no. E0453; Dako; Agilent Technologies, Inc.) for 30 min at room temperature. Specimens were visualized by exposure to diaminobenzidine solution (Dako; Agilent Technologies, Inc.), and counter-stained with Meyer's hematoxylin (Sigma-Aldrich; Merck KGaA) at room temperature for 10 min.
Evaluation of immunohistochemistry
Verification of histological diagnoses and grading of immunohistochemistry were performed by two pathologists. To quantify the MCTC density, MVD and LVD, five strongly immunoreactive areas surrounding tumor cells were selected and examined using a light microscope (magnification, x200; BX53; Olympus Corporation), and densities were averaged. To determine the association between MCTC density and disease-free survival, the specimens were divided into two groups according to the MCTC density based on the overall mean value (23).
Laser capture microdissection (LCM)
Laser capture micro-dissection was performed to specifically select OSCC cells for the preparation of small RNAs. Tissue sections (7 µm) were prepared from each paraffin block, and stained using hematoxylin and eosin at room temperature for 10 min. A PixCell II LCM microscope (Arcturus) was used to capture and transfer cells for microdissection according to the manufacturer's instructions; ~5,000 tumor cells were acquired from each tissue sample.
Reverse transcription-quantitative polymerase chain reaction (RT-qPCR)
Total RNA of tissues and cultured cells was extracted using an RNeasy FFPE Kit (Qiagen, Inc.), and 1 ng of total RNA was converted to cDNA using a ReverTra Ace qRT kit (Toyobo Life Science) at 37˚C for 15 min and 95˚C for 5 min. qPCR was performed on a StepOnePlus Real-Time PCR System (Applied Biosystems; Thermo Fisher Scientific, Inc.) with TaqMan Fast Universal PCR Master Mix (Applied Biosystems; Thermo Fisher Scientific, Inc.). The reactions were pre-incubated at 95˚C for 20 sec, followed by 40 cycles of denaturation at 95˚C for 1 sec and annealing/extension at 60˚C for 20 sec. Results were analyzed using the 2-∆∆Cq method (27). GAPDH mRNA was used as the internal control. The TaqMan Gene Expression Assays for MIA (cat. no. Hs00197954_m1), MIA2 (cat. no. Hs00365015_m1), TANGO/MIA3 (cat. no. Hs00412706_m1), and GAPDH (cat. no. Hs03929097_g1) were purchased from Applied Biosystems (Thermo Fisher Scientific, Inc.). All PCR reactions were performed in triplicate.
Cell culture and reagents
Our previous studies reported that OSCC-derived HSC3 cells overexpress MIA (21,22), MIA2 (20) and TANGO (23). Therefore, HSC3 cells were used in the present study and maintained in Dulbecco's modified Eagle's medium (Wako Pure Chemical Industries, Ltd.) supplemented with 10% fetal bovine serum (Nichirei Biosciences, Inc.) and 10,000 U/ml penicillin/10,000 µg/ml streptomycin (Wako Pure Chemical Industries, Ltd.) under 5% CO2 and 95% air at 37˚C. Cells were treated with various concentrations (0, 5 or 10 nM) of recombinant human chymase (R&D Systems, Inc.) for 48 h at 37˚C.
Primary human umbilical vein endothelial cells (HUVECs) and primary human dermal lymphatic microvascular endothelial cells (HDLMVECs) were purchased from Cell Applications, Inc. HUVECs were cultured in endothelial cell media (Cell Applications, Inc.), and HDLMVECs were cultured in microvascular endothelial cell media (Cell Applications, Inc.), both with 5% CO2 at 37˚C.
Small interfering RNA (siRNA)
Stealth Select RNAi siRNAs for MIA (cat. no. HSS144615), MIA2 (cat. no. HSS133246) and TANGO (cat. no. HSS180081) were purchased from Thermo Fisher Scientific, Inc. AllStars Negative Control siRNA was used as a control (cat. no. SI03650318; Qiagen, Inc.). Cells were seeded (6,000 cells/well) in 24-well culture plates and cultured for 24 h. Cells were transfected with 10 nM siRNA using Lipofectamine® 2000 (Invitrogen; Thermo Fisher Scientific, Inc.) according to the manufacturer's protocols. Subsequent experiments were performed after 48 h of transfection.
Immunoblotting
Whole cell lysates were obtained using M-PER™ Mammalian Protein Extraction Reagent (Thermo Fisher Scientific, Inc.). Protein concentrations of the lysates were determined by using a DC™ protein assay (Bio-Rad Laboratories, Inc.). Lysates (50 µg/lane) were subjected to 12.5% SDS-PAGE and immunoblotting by electrotransfer to PVDF membranes (Thermo Fisher Scientific, Inc.). Bullet Blocking One for Western Blotting (Nacalai Tesque, Inc.) was used as a blocking reagent (ready to use) at room temperature for 10 min. The membranes were incubated with anti-MIA (1:10,000; cat. no. sc-377375; Santa Cruz Biotechnology, Inc.), anti-MIA2 (1:10,000; cat. no. ab58973; Abcam) and anti-TANGO/MIA3 antibodies (1:15,000; cat. no. LS-B4210; LifeSpan BioSciences, Inc.) for 12 h at room temperature. Binding of the primary antibodies was detected with peroxidase-conjugated anti-mouse (cat. no. sc-516102; Santa Cruz Biotechnology, Inc.) or anti-rabbit antibody (1:5,000; cat. no. sc-2357; Santa Cruz Biotechnology, Inc.) for 2 h at room temerature. The immune complex was visualized with an ECL Western Blotting Detection System (Amersham; GE Healthcare Life Sciences). Anti-GAPDH antibody (1:10,000; cat. no. sc-20357; Santa Cruz Biotechnology, Inc.) was used as an internal control.
ELISA for MIA family
Cell culture medium was collected and centrifuged at 270 x g at 4˚C for 10 min. Proteins in the supernatant were then extracted using M-PER Mammalian Protein Extraction Reagent. ELISA kits were used to analyze MIA (cat. no. 11976826001; Roche Diagnostics), MIA2 (cat. no. LS-F16959; LifeSpan BioSciences, Inc.), TANGO/MIA3 (cat. no. LS-F52248; LifeSpan BioSciences, Inc.), VEGF-A (cat. no. RAB0508; Calbiochem; Merck KGaA), VEGF-C (cat. no. DVEC00; R&D Systems, Inc.), VEGF-D (cat. no. DVED00; R&D Systems, Inc.) and PDGFB (cat. no. DBB00; R&D Systems, Inc.). The assays were performed according to the manufacturers' instructions and in triplicate. The presented data are the mean of three independent experiments.
Interaction assays of OSCCs and endothelial cells
The reciprocal actions of OSCC cells and endothelial cells were tested using a CytoSelect Tumor-Endothelium Adhesion Assay (Cell Biolabs, Inc.) in conjunction with the CytoSelect Tumor Transendothelial Migration Assay system (Cell Biolabs, Inc.) according to the manufacturer's protocols. Cellular adhesion and migration were measured using a Multiskan GO Microplate Spectrophotometer (Thermo Fisher Scientific, Inc.) at 480 and 520 nm, respectively.
Statistical analysis
All statistical analyses were conducted using JMP13 (SAS Institute). Continuous data were presented as the mean ± SD. The differences in MCTC density between were analyzed by unpaired parametric t-test or one-way ANOVA, and multiple comparisons were analyzed by Tukey test. Moreover, cell experiments were analyzed using one-way ANOVA, and multiple comparisons were made using Tukey's test. The correlations between MVD, LVD and expression levels of MIA gene family and MCTC density were analyzed with Pearson's correlation coefficient. Disease-free survival was calculated using the Kaplan-Meier method, and differences between groups were tested by means of a log-rank test. P<0.05 was considered to indicate a statistically significant difference.
Results
MCTC density, MVD and LVD in OSCC specimens
First, MCTC density, MVD and LVD were evaluated in 93 patients with OSCC using immunohistochemistry. The mean ± SD values of the MCTC density, MVD and LVD in OSCC cases were 49.7±30.6, 50.6±34.5 and 25.6±13.4 cells or vessels/field of view, respectively (Fig. 1A-F). No expression of chymase was observed in OSCC cells.
The clinicopathological relevance of MCTC density in OSCC is presented in Table I. Significantly higher density was observed in patients with nodal metastasis compared with those without nodal metastasis (P=0.0029). Significant relationships were also found between the MCTC density and histological grade (P=0.0443), local progression (T grade; P=0.0347), and clinical stage (P=0.0157). No relationship was found between MCTC density and other clinicopathological characteristics in OSCC. MCTC density was also correlated with MVD (P<0.0001) and LVD (P=0.0473) in OSCC (Fig. 1G and H).
Relationship between MCTC density and MIA gene family expression in OSCC specimens
It was previously reported that the MIA gene family is associated with MVD and LVD in OSCC (20-24). Thus, the expression levels of MIA, MIA2 and TANGO were analyzed via RT-qPCR, and the correlations with MCTC density in OSCC specimens were evaluated. Expression levels of MIA (P=0.0023) and MIA2 (P= 0.012) were correlated with MCTC density, whereas those of TANGO were not (Fig. 2A-C).
Relationship between MCTC density and OSCC prognosis
During the follow-up period, 17 of the 93 patients presented with a local or metastatic recurrence of cancer. The overall mean clinical follow-up time was 1,282 days, and ranged from 115 to 1,895 days. The disease-free survival curves suggested that cases with high MCTC density tended to have a poorer prognosis than those with lower MCTC density; however, there was no significant difference (P=0.0801; Fig. 3).
Effect of chymase on secretion of MIA family proteins, and angiogenesis and lymphangiogenesis in OSCC cells
HSC3 cells overexpress members of the MIA family (20-23). As MIA, MIA2 and TANGO are secretory proteins (4), the effect of chymase on the secretion and expression of the MIA gene family was evaluated in HSC3 cells. Secretion and expression of MIA and MIA2 was increased by treatment with recombinant human chymase, whereas MIA or MIA2 knockdown abolished the chymase-induced increase in MIA or MIA2 secretion (Fig. 4A-E). The secretion levels of TANGO were not affected by treatment with different concentrations of chymase in HSC-3 cells (Fig. 4D and E). These results suggested that chymase increases the expression and secretion of MIA and MIA2 in a paracrine manner in OSCC cells.
MIA and MIA2 are angiogenic and lymphangiogenic factors, inducing VEGF family activation, whereas TANGO promotes angiogenesis and lymphangiogenesis via the activation of PDGFB in HSC3 cells (4,20-23). Next, the relationship between chymase and MIA gene family-induced angiogenesis and lymphangiogenesis was investigated. The secretion of VEGF-A, VEGF-C, and VEGF-D was increased following treatment with chymase in a dose-dependent manner in HSC3 cells, but not in MIA or MIA2 knockdown HSC3 cells (Fig. 5A-C). TANGO siRNA similarly attenuated chymase-induced increases in VEGF-A, VEGF-C and VEGF-D. Moreover, secretion levels of PDGFB were not affected by chymase treatment (Fig. 5D). Finally, although the adhesion and transmigration abilities of HSC3 cells to endothelial cells were increased by chymase treatment, these abilities were inhibited by MIA, MIA2 or TANGO siRNA (Fig. 5E-H).
Collectively, the present resulted suggested that chymase promotes OSCC progression by inducing MIA- and MIA2-dependent angiogenic and lymphangiogenic mechanisms.
Discussion
The TME is proposed to substantially contribute to cancer progression and metastasis (4). During this process, angio-genesis and lymphangiogenesis are pivotal events (21). Our previous study showed that high MVD and LVD, resulting from activation of the VEGF family, are strongly associated with T grade, clinical stage, nodal metastasis, local recurrence and poor prognosis in OSCC (21). MCs are present in the TME, and induce positive or negative effects on cancer (5,10-17). In human OSCC, an increase in MCT density is strongly associated with MVD (28). Mohtasham et al (29) also reported a gradual increase in MCT from oral dysplasia to OSCC. In addition, a separate study observed a significant increase in the numbers of MCTC in OSCC compared with healthy oral mucosa (30). Conversely, another study showed that the numbers of MCT decrease in OSCC and leukoplakia compared with normal oral mucosa (31). Hence, there remains substantial uncertainty regarding the role of MCs in OSCC, particularly the relevance of MCTC to lymphangiogenesis.
Chymase is a component of the renin-angiotensin system and plays a key role in blood pressure regulation (32,33). In malignancies, chymase can cleave pro-MMP9 to produce MMP9, generate Ang II from Ang I, and induce angiogenesis via the activation of VEGF-A (5). Other studies have suggested that MCT promote lymphangiogenesis by releasing VEGF-C and VEGF-D in mild and moderate periodontitis (7,8,34). In the present study, it was revealed that MCTC density is associated with tumor progression and nodal metastasis in OSCC. Moreover, a significant correlation was observed between MCTC density, and MVD, LVD, and expression levels of MIA and MIA2 in OSCC specimens. In OSCC cells, chymase promoted angiogenesis and lymphangiogenesis through the secretion of VEGF-A, VEGF-C, and VEGF-D via MIA and MIA2 activation.
MIA/MIA2-integrin α4/α5 signaling is regulated by the phosphorylation of mitogen-activated protein kinase p38 and c-Jun N-terminal kinase, and promotes OSCC progression, angiogenesis and lymphangiogenesis via upregulation of VEGF family activity (4,20,21,24). As TANGO activates PDGFB-dependent neovasculogenesis in OSCC (23), it is proposed that chymase does not promote angiogenesis and lymphangiogenesis via TANGO. The interaction of VEGF family members secreted by OSCC cells and MCTC may augment the potential for angiogenesis and lymphangiogenesis. A recent study suggested that chymase promotes cell detachment by decreasing E-cadherin, and facilitates the destruction of the extracellular matrix (ECM) through the activation of MMP-9 in human lung adenocarcinoma and squamous cell carcinoma cells (35). In cancer cells, MIA can bind to fibronectin, a major component of the ECM, and both MMP and MIA gene family receptors are cell surface integrins (4,6,19,36). Chymase in the TME may enhance ECM destruction, angiogenesis and lymphangiogenesis by interacting with MIA secreted from cancer cells. Therefore, further studies are warranted to further understand the mechanisms underlying this process.
In general, the release of histamine, interleukin-10 and tumor necrosis factor-α from MCT leads to the suppression of tumor immunity in several malignancies (37). Cancer cells also suppress tumor immunity and create an environment in which they can easily grow (20,37,38). Previous results have indicated that tumor-derived MIA may contribute to immune escape mechanisms frequently seen in patients with melanoma by suppressing the activation of immune cells and their associated antitumor cytotoxicity (38). Moreover, our previous study reported that MIA2 expression in OSCC is promoted by a disturbance in tumor immunity via the suppression of cytotoxic T lymphocytes and a relative increase in regulatory T lymphocytes (20). MCTC may also disrupt tumor immunity via interactions with MIA and MIA2 in OSCC cells. Additional studies are required to elucidate the immunosuppression observed following MCTC activation.
The functions and roles of chymase in tumor tissue remain controversial. Two polymorphisms in the chymase gene (CMA), CMA/A and CMA/B, are localized on chromosome 14 and associated with chymase expression (39). Sugimoto et al (32,33) reported that the CMA/B polymorphism in leukocytes is strongly associated with an increased risk of gastric cancer development and progression in Japanese populations. Conversely, Shimomoto et al (40) observed that the expression of MC chymase is upregulated in colon cancer-derived HT29 and CT26 cells, and the cytoplasm of colon cancer specimens. To our knowledge, there is no other report that chymase is expressed in epithelial cells. Therefore, there are questions regarding the findings of the aforementioned study, and further studies are required to determine the accurate expression of chymase in cancer cells.
Fig. 6 presents a proposed schematic of the mechanisms of MCTC in OSCC based on the findings of the present study. MCTC may accelerate angiogenesis and lymphangiogen-esis via the activation of the VEGF family. Moreover, it is suggested that OSCC cells stimulated by chymase induce VEGF family secretion through MIA and MIA2, and promote angiogenesis and lymphangiogenesis in combination with MCTC. Consequently, it is proposed that MCTC act as tumor promoting factors by upregulating MIA and MIA2 activity in OSCC. A previous study suggested that cimeti-dine inhibits the activation of MCs in patients with breast cancer (41). Additionally, c-kit signaling is critical for MCs and the antitumor effects of imatinib, a tyrosine kinase inhibitor with activity against c-kit, which are mediated via mast cell inhibition (42,43). The antiangiogenic agents, sunitinib, sorafenib and nilotinib, have similar effects to imatinib, and may also be effective in suppressing cancer cells by regulating MC functions (37). Angiogenesis and lymphangiogenesis are pivotal events in tumor progression, and the resulting irregular neoplastic blood and lymphatic vessels interfere with the delivery of anticancer drugs (4). Normalization of the tumor vessels by using antiangiogenic and antilymphan-giogenic treatments targeting the chymase-MIA gene family network may be useful methods for malignancies. However, the function of MCTC may vary depending on the type of cancer and clinical stage. More detailed studies are required to elucidate the varied roles of MCs; however, the present findings indicated the relevance of MCTC as a diagnostic and therapeutic target in OSCC.
Funding
This work was supported by JSPS KAKENHI (grant nos. JP 17K11621 and 18K09796).
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Authors' contributions
TS, AKB and TK conceived and designed the study. MKS, TS and HS acquired data. MKS, TS, HS and AKB analyzed and interpreted data. TS, MKS, AKB and TK drafted, revised and/or reviewed the manuscript. All authors read and approved the final manuscript.
Ethics approval and consent to participate
The present study was approved by the Medical Ethical Committee of the Nara Medical University (approval no. 719). The study protocol using human samples was performed according to the ethical standards laid out in the Declaration of Helsinki.
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
Acknowledgments
Not applicable.
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