MicroRNA‑27b‑3p inhibits the proliferation and invasion of cutaneous squamous cell carcinoma by targeting EGFR and MMP‑13

  • Authors:
    • Daning Liang
    • Zhenning Zhang
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  • Published online on: August 10, 2021     https://doi.org/10.3892/ol.2021.12990
  • Article Number: 729
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Abstract

Cutaneous squamous cell carcinoma is a common malignant tumor. The aim of the present study was to examine the biological function of microRNA (miR)‑27b‑3p in cutaneous squamous cell carcinoma (CSCC) and its underlying mechanism. The relative expression levels of miR‑27b‑3p were determined in A‑431, Colo‑16 and NHEK/SVTERT3‑5 cell lines. The regulatory effects of miR‑27b‑3p on the proliferation of CSCC cells were evaluated using MTT and colony formation assays. Transwell assays were conducted to examine the role of miR‑27b‑5p in the migratory and invasive abilities of CSCC cells. The levels of EGFR, MMP‑13, Akt, phosphorylated (p)‑Akt, cyclin D1, N‑cadherin (CAD) and E‑CAD were detected in CSCC cells using reverse transcription‑quantitative PCR and western blot analysis. Binding between miR‑27b‑3p and the 3'‑untranslated region (UTR) of EGFR or MMP‑13 was assessed using a dual‑luciferase reporter assay. miR‑27b‑3p was significantly downregulated in CSCC cell lines, compared with the skin keratinocyte cell line. Transfection with a miR‑27b‑3p mimic significantly reduced the proliferative, migratory and invasive abilities of CSCC cells in vitro. Moreover, miR‑27b‑3p mimic transfection downregulated the mRNA and protein levels of EGFR, MMP‑13, cyclin D1, p‑Akt and N‑CAD, whilst upregulating E‑CAD levels in CSCC cells. miR‑27b‑3p was found to target the EGFR and MMP‑13 3'‑UTRs, thus downregulating the expression of these molecules. The inhibition of CSCC proliferation by miR‑27b‑3p was effectively reversed by EGFR overexpression. Moreover, the inhibitory effect of miR‑27b‑3p on the migratory and invasive abilities of CSCC cells was abolished by MMP‑13 overexpression. In conclusion, miR‑27b‑3p inhibits the proliferation, migration and invasion of CSCC cells by downregulating the expression of EGFR and MMP‑13 and may represent a potential diagnostic marker and therapeutic option for CSCC.

Introduction

Cutaneous squamous cell carcinoma (CSCC) is a malignant tumor originating from the epidermis or keratinocytes of skin appendages (1). CSCC ranks second to basal cell cancer as the most common type of skin cancer in the USA (2). This global incidence continues to increase annually with an estimated 50–200% increase in the last three decades (3), CSCC severely endangers human health and lives (4). Surgery is the preferred treatment option for patients with CSCC (5). Although surgical resection can eliminate small superficial tumor lesions, lymphadenectomy of the removal of the regional draining lymph node is necessary for cancer cases with high risks of lymph node invasion (6,7). The risk of nodal metastasis (NM) in cohort and tumor registry studies has ranged from 2.0 to 5.8%. A single cohort study reported a risk of disease-specific death (DSD) of 1.5% (8), which is mainly attributed to cancer cell infiltration and metastasis (9).

MicroRNA (miRNA/miR) is a type of endogenous small non-coding RNA (10). miRNA molecules can induce mRNA degradation, inhibit gene transcription or lead to mRNA deadenylation by binding the 3′-untranslated region (UTR) of target mRNA transcripts (11). A previous study have revealed the crucial functions of miRNA in cancer development (12). Miao et al (13) demonstrated that miR-27b-3p played an important role in the development of glioma and that Yes-associated protein 1 (YAP1) was the downstream target of this miRNA. Moreover, they also suggested that miR-27b-3p controlled the proliferation, migration and apoptosis of glioma cells by regulating YAP1 (13). Yang et al (14) also reported overexpression of miR-27b-3p in colorectal cancer and suggested that miR-27b-3p could significantly promote the migration and invasion of colorectal cancer by targeting homeobox A10.

EGFR is a transmembrane receptor tyrosine kinase that initiates multiple intracellular signaling pathways (15). EGFR regulates the proliferation, invasion, metastasis and apoptosis of cancer cells (15). MMP-13 is a matrix metalloproteinase that participates in the degradation of the extracellular matrix and is involved in tumor cell metastasis (16,17). Our previous studies found that EGFR and MMP-13 are highly expressed in CSCC (18,19). However, the potential functions of EGFR and MMP-13 in the proliferation and metastasis of CSCC remain largely unclear. The aim of the present study was to examine the biological function of miR-27b-3p in CSCC and its underlying mechanism to find potential molecular markers and therapeutic targets for clinical treatment of CSCC.

Materials and methods

Cell culture

The human CSCC cell lines A-431 (cat. no. MZ-0014; Ningbo Mingzhou Biotechnology Co., Ltd.), Colo-16 (cat. no. MZ-1591; Ningbo Mingzhou Biotechnology Co., Ltd.), HSC-1 (cat. no. MZ-1501; Ningbo Mingzhou Biotechnology Co., Ltd.) and SCL-1 (cat. no. MZ-1504; Ningbo Mingzhou Biotechnology Co., Ltd.), human skin keratinocyte cell line NHEK/SVTERT3-5 (cat. no. CE22072; Beijing Crespo Biotechnology, Co., Ltd.) and the 293T cell line (cat. no. MZ-0005; Ningbo Mingzhou Biotechnology Co., Ltd.) were provided by Ningbo Mingzhou Biotechnology Co., Ltd. and Beijing Crespo Biotechnology, Co., Ltd. NHEK/SVTERT3-5 cells were used as a control.

The cells were cultured in Dulbecco's modified Eagle's medium (DMEM) (Gibco; Thermo Fisher Scientific Inc.) containing 10% fetal bovine serum (FBS) (Gibco; Thermo Fisher Scientific Inc.) and 1% penicillin-streptomycin in a humidified atmosphere with 5% CO2 at 37°C. When the cells reached 80% confluence, cell passage was performed using trypsin. The cells were cryopreserved in 20% DMSO and at −80°C.

Cell transfection

The miR-27b-3p mimic (5′-CGUCUUGAAUCGGUGACACUU-3′) and mimic negative control (NC) (5′-AAGUGUCACCGAUUCAAGACG-3′) were synthesized by Guangzhou RiboBio Co., Ltd.. Cells were cultured in serum-free Opti-DMEM™ (Gibco; Thermo Fisher Scientific) for 4-h starvation. A mixture containing mimics or mimic-NC and Lipofectamine® 2000 reagent (Invitrogen; Thermo Fisher Scientific, Inc.) was incubated for 20 min at room temperature and added into each well at a final concentration of 100 nM in 5% CO2 for 40 min at 37°C, and then, the Opti-MEM was then replaced with DMEM containing 10% FBS and 1% penicillin-streptomycin. After 24-h cell culture, reverse transcription-quantitative PCR (RT-qPCR) was used to evaluate the transfection efficacy.

RT-qPCR

Total RNA was extracted from cell lines using TRIzol® (Invitrogen; Thermo Fisher Scientific, Inc.). Using the Takara Primescript™ RT Reagent Kit (Takara Bio, Inc.), 1 µg/µl of the RNA sample was purified with a gDNA eraser and reverse transcribed to cDNA. The RT steps were as follows: 25°C for 5 min, 42°C for 15 min and 85°Cfor 5 sec. qPCR was carried out using SYBR Premix Ex Taq™ II with Tli RNaseH (Takara Bio, Inc.). The thermocycling conditions consisted of an initial denaturation at 95°C for 15 min, followed by 40 cycles at 95°C for 5 sec, 60°C for 30 sec and 72°C for 40 sec, then a final extension at 72°C for 10 min. The results was analyzed following the 2−ΔΔCq method (20). GAPDH and U6 served as the internal references. Primer sequences are listed in Table I.

Table I.

Primer sequences.

Table I.

Primer sequences.

Primer namePrimer sequence, 5′-3′
miR-27b-3p-F AGTGGCTAAGTTCTGCGTCG
miR-27b-3p-R GTATCCAGTGCGTGTCGTGG
Akt-F TCTATGGCGCTGAGATTGTG
Akt-R CTTAATGTGCCCGTCCTTGT
Cyclin D1-F CGATGCCAACCTCCTCAACGA
Cyclin D1-R TCGCAGACCTCCAGCATCCA
N-CAD-F CCACAGACATGGAAGGCAATCC
N-CAD-R CACTGATTCTGTATGCCGCATTC
E-CAD-F GTACTTGTAATGACACATCTC
E-CAD-R TGCCAGTTTCTGCATCTTGC
GAPDH-F GAAGGTGAAGGTCGGAGT
GAPDH-R GAAGATGGTGATGGGATTTC
U6-F CTCGCTTCGGCAGCACA
U6-R AACGCTTCACGAATTTGCGT

[i] F, forward; R, reverse; miR, microRNA; CAD, cadherin.

Western blot analysis

Total protein from CSCC cells was collected, and first isolated by RIPA lysis buffer (Beyotime Institute of Biotechnology), and protein samples was determined by BCA method at 1 µg/µl. The protein samples were then subjected to 5% (for EGFR, N-CAD and E-CAD) or 10% (for MMP-13, AKT, p-AKT, cyclin D1 and GAPDH) gel electrophoresis (50 µg/lane), then transferred to PVDF membranes. Non-specific antigen binding was blocked using 5% skimmed milk in room temperature for 1 h. Membranes were incubated with primary antibodies (1:1,000) at 4°C overnight and then incubated with secondary antibodies (1:1,000) at room temperature for 1 h. Finally, the membrane was treated with chemiluminescent horse radish peroxidase (HRP) Substrate (cat. no. WBKLS0500; MilliporeSigma) to visualize the protein. Antibodies used in western blot assay were purchased from ABclonal Biotech Co., Ltd., and the catalog numbers were as follows: EGFR (cat. no. A4929); MMP-13 (cat. no. A11148); AKT (cat. no. A17909); p-AKT (cat. no. AP0637); cyclin D1 (cat. no. A11022); N-CAD (cat. no. A19083); E-CAD (A3044); GAPDH (cat. no. AC001) and the secondary antibody HRP goat anti-rabbit (cat. no. AS014). Band exposure was achieved using the enhanced chemiluminescence method and visualized by Quantity One software v.4.6.9 (Bio-Rad Laboratories, Inc.).

Colony formation assay

CSCC cells were seeded in a 6-well plate at a density of 2×102 cells/well, then cultured in DMEM containing 10% FBS for 14 days until the formation of visible colonies. The colonies were washed with PBS, fixed in 4% paraformaldehyde for 30 min at room temperature and stained in 1% crystal violet for 15 min at room temperature. Visible colonies were captured under an inverted microscope and the number of colonies were counted that had >50 cells.

MTT assay

MTT assay was conducted according to the manufacturer's instructions of MTT Assay kit (ABclonal Biotech Co., Ltd.; cat. no. ab211091). CSCC cells were seeded in a 96-well plate at a density of 6×103 cells/well. At the 12, 24, 36, 48 and 60-h time points, 20 µl MTT (5 mg/l) was added to each well at 37°C for 4 h. The supernatant was then discarded, and 150 µl DMSO was added to each well. After gentle shaking for 10 min, the optical density at 570 nm was measured using an ultraviolet spectrophotometer.

Wound healing assay

At the bottom of a 24-well plate, an auxiliary line (perpendicular to the cell scratch) was drawn every 0.5 cm to ensure the consistency of each observation site. Cells were seeded at 5×105 cells/well and cultured into a monolayer. An artificial wound was created using a pipette tip, and the scratched cells were washed in serum-free medium (21). After 24 h culture, cell migration was observed using an inverted microscope. The scratch area was calculated by ImageJ v.1.8.0 software (National Institutes of Health).

Transwell assay

Matrigel diluted in DMEM at a 1:5 ratio (100 µl) was used to coat in a Transwell chamber, then dried in cell incubator at 37°C in 5% CO2; 24-well plates were used for cell culture. On the following day, 200 µl cell suspension (2.5×104 cells/ml) and 500 µl DMEM containing 10% FBS were added to the top and bottom chambers, respectively. After 24-h culture, the inner side cells that did not pass through the membrane were discharged and stained with crystal violet for 5 min. Photomicrographs were captured with an inverted fluorescence microscope (magnification, ×100).

Dual-luciferase reporter assay

Target prediction for miR-27b-3p was carried out using TargetScan v.7.2 (http://www.TargetScan.org/vert_72/). The 3′-UTRs of EGFR and MMP-13 were cloned into pmir-GLO vectors (Promega Corporation) to generate EGFR wild-type (wt) and MMP-13 wt vectors. The EGFR mutant (mut) and MMP-13 mut vectors were generated using the GeneTailer site-directed mutagenesis kit (Invitrogen; Thermo Fisher Scientific Inc.). The aforementioned vectors were mixed with the miR-27b-3p mimic or mimic-NC and Lipofectamine® 2000 (Invitrogen; Thermo Fisher Scientific, Inc.) for 20 min at room temperature. The mRNA/plasmid/Lipofectamine 2000 mixture was then added to the cells for 40 min at 37°C in a humidified atmosphere containing 5% CO2, the plasmids was transfected at 500 ng per well and the final concentration of mimic or mimic-NC was 20 nM. Cells were then cultured at 37°C and 5% CO2 for 48 h. Luciferase activity was then determined using a dual-luciferase reporter assay system (Promega Corporation). Relative luciferase activity was expressed as the ratio of firefly luciferase activity to Renilla luciferase activity.

Lentivirus transduction

A 2nd generation system was used to the package of lentivirus. EGFR and MMP-13 overexpression plasmids were generated by cloning the sequences of these two genes into the GV287 plasmid (Shanghai GeneChem Co., Ltd.), the lentiviral plasmid was mixed with packaging vector (Shanghai GeneChem Co., Ltd.) and envelope vector (Shanghai GeneChem Co., Ltd.) at a 4:3:2 ratio for a total DNA mass of 20 µg, the mixture was then incubated with Lenti-Easy Packaging Mix (cat. no. LPK001; Shanghai GeneChem Co., Ltd.) at 37°C for 15 min and then incubated incubation with Lipofectamine® 2000 (Invitrogen; Thermo Fisher Scientific Inc.) for another 20 min. The mixture were added into 293T cells (cat. no. MZ-0005; Ningbo Mingzhou Biotechnology Co., Ltd.) for 6 h at 37°C. The transfection medium was replaced with fresh DMEM medium, 293T cells were cultured overnight to 80% confluence. Opti-MEM was replaced for another 4 h culture. The lentiviral plasmid, packaging vector and envelope vector were mixed at a 4:3:2 ratio for a total DNA mass of 20 µg and incubated with 1 ml Lenti-Easy Packaging Mix for 15 min. The mixture was then incubated with Lipofectamine® 2000(Invitogen; Thermo Fisher Scientific Inc.) for another 20 min. Finally, the mixture was incubated with 293T cells for 6 h at 37°C (2.5×105 cells/plate in a 10-cm plate), which were previously incubated in Opti-MEM for 4 h. Then, the medium was then replaced with DMEM containing 10% FBS and 1% penicillin-streptomycin on the following day. At the 72-h time point, the supernatant of the transfected 293T cells was collected and centrifuged via 4.5 µm filter, then concentrated by ultracentrifugation at 70,000 × g at 4°C for 2 h. The suspension was filtered to determine the viral titers. The A-431 and Colo-16 cells were cultured at 80% confluence, then infected with lentivirus at a multiplicity of infection of 5 and with polybrene (Sigma-Aldrich; Merck KGaA) for 24 h. Fresh culture medium was then used to replace the old medium. After 3 days, the fluorescence intensity was subsequently observed to screen stable cell lines and the transfection efficiency was determined by RT-qPCR.

Statistical analysis

Statistical analysis was performed using GraphPad Prism 8 (GraphPad Software, Inc.). Data were normally distributed and are presented as the mean ± SD. Comparisons between multiple groups were analyzed using one-way ANOVA followed by Tukey's post hoc test or Bonferroni correction. P<0.05 was considered to indicate a statistically significant difference. All experiments were performed in triplicate and repeated three times.

Results

miR-27b-3p is downregulated in CSCC cells

The relative expression levels of miR-27b-3p, EGFR and MMP-13 in human CSCC cell lines and human normal skin fibroblasts were detected (Fig. 1). miR-27b-3p was downregulated in CSCC cell lines compared with the normal skin keratinocyte cell line NHEK/SVTERT3-5.

miR-27b-3p inhibits the proliferation, migration and invasion of CSCC cells

Compared with untransfected cells and cells transfected with mimic-NC, transfection of A-431 and Colo-16 cells with miR-27b-3p mimic upregulated the expression of miR-27b-3p, but downregulated the mRNA expression levels of EGFR and MMP-13 (Fig. 2A). The results of colony formation and MTT assays indicated that overexpression of miR-27b-3p significantly inhibited the proliferative ability of the CSCC cells (Fig. 2B and C). Moreover, wound healing and Transwell assays demonstrated that miR-27b-3p could attenuate the migratory and invasive abilities of CSCC cells (Fig. 2D and E). The protein expression levels of p-Akt/total AKT, cyclin D1 and N-CAD were downregulated in CSCC cells overexpressing miR-27b-3p, whereas E-CAD was upregulated (Fig. 2F).

miR-27b-3p binds to the 3′-UTRs of EGFR and MMP-13

Target prediction with TargetScan indicated that miR-27b-3p contained sequences that could interact with the 3′-UTRs of EGFR and MMP-13 (Fig. 3A). The dual-luciferase reporter assay revealed that co-transfection with the miR-27b-3p mimic significantly decreased luciferase activity in EGFR wt and MMP-13 wt, but not EGFR mut and MMP-13 mut (Fig. 3B). This finding confirmed that miR-27b-3p targeted EGFR and MMP13.

Overexpression of EGFR or MMP-13 reverses the effects of miR-27b-3p on CSCC cells

A-431 and Colo-16 cells were co-transfected with the miR-27b-3p mimic and lentivirus infection. Transfection efficiency is shown in Fig. 4A and relevant RNA expression was shown as Fig. 4B. Notably, overexpression of EGFR significantly reversed the inhibitory effect of miR-27b-3p on CSCC proliferation (Fig. 4C and D). Overexpression of MMP-13 and the miR-27b-3p mimic increased the migration and invasion of CSCC cells, compared with cells transfected with the mimic alone (Fig. 4E and F). Co-overexpression of EGFR markedly promoted the viability and proliferation of CSCC cell lines, while overexpression of MMP-13 markedly enhanced the migration and invasion of CSCC cells (Fig. 4C-F). Moreover, overexpression of EGFR upregulated p-Akt/total AKT expression and cyclin D1. Overexpression of MMP-13 downregulated N-CAD and upregulated E-CAD levels compared with untreated or mimic-group (Fig. 4G). Therefore, overexpression of EGFR and MMP-13 reversed the inhibitory effect of miR-27b-3p on CSCC cells.

Discussion

The prognosis of CSCC is closely associated with clinical manifestations and histopathology, including tumor size, infiltration depth, nerve involvement, previous therapeutic effects, histological differentiation and immune status (22). The American Joint Committee on Cancer uses criteria including tumor diameter larger than 2 cm, poor cellular differentiation, depth of invasion more than 2 mm or to the reticular dermis (Clark level IV), perineural invasion, or ear or mucosal lip location to classify high-risk tumors (8). Gore et al (9) analyzed 57 patients with CSCC and found that patients with lymphatic metastasis experienced poor prognosis and high mortality. Among them, 8 patients presented lymphatic metastasis, with infiltration of nerves and lymphatic vessels as the main reasons affecting their prognosis. During the follow-up period of 19.4 months, 9 patients experienced recurrence, including 6 deaths. Thus, infiltration and metastasis may be the leading causes of deterioration and poor prognosis in CSCC.

miR-27b-3p, which exhibits anticancer effects, is downregulated in several types of cancer, such as breast cancer, lung carcinoma, esophageal carcinoma and colorectal carcinoma (14,2325). Han et al (24) determined that miR-27b-3p was downregulated in esophageal squamous cell carcinoma (ESCC) tissue samples and cell lines and was associated with poor cell differentiation, TNM staging and lymphatic metastasis. The transcription factor nuclear-related factor 2 is the direct target of miR-27b-3p, as evidenced by dual-luciferase reporter assays (24). In a study conducted by Zeng et al (26), IL-10 induced the upregulation of miR-27b-3p and reduced the mRNA stability of proliferating cell nuclear antigen, which inhibited the development of hemangioma cavernosum. As the target of the long non-coding RNA HLA complex P5, miR-27b-3p drives the malignant development of gastric cancer, including proliferation and epithelial-to-mesenchymal transition (EMT) (27). However, the potential functions of miR-27b-3p in the development of CSCC have rarely been studied. The results of the present study revealed that miR-27b-3p was significantly downregulated in CSCC cell lines. Overexpression of miR-27b-3p attenuated the proliferative, migratory and invasive abilities of A-431 and Colo-16 cells compared with untreated group. In addition, the relative expression levels of EGFR, MMP-13, Akt, p-Akt and cyclin D1 were downregulated by miR-27b-3p overexpression, while E-CAD was upregulated compared with untreated group. These findings suggested that miR-27b-3p exerted an inhibitory role on the growth of CSCC cells.

EGFR is a transmembrane glycoprotein encoded by the proto-oncogene C-erbB-1 (28). Binding of ligands to the extracellular domain of EGFR triggers conformational changes in its transmembrane region and activates the intracellular region to bind to ATPase, leading to autophosphorylation and transphosphorylation. Consequently, multiple cellular signaling pathways are induced (29). For instance, EGFR can affect tumor development, metastasis and drug resistance mainly by activating the RAS-RAF-MAPK, the PI3K-PTEN-Akt and the JAK/STAT pathways (30). Diego Carrillo-Beltrán et al (31) analyzed relevant signaling pathways that mediate the carcinogenesis of oral cancer induced by high-risk human papillomavirus infection and demonstrated that HPV16 E7 activated the EGFR/PI3K/Akt1/NRF2, which in turn induced the activation of pirin/NF-κB signaling in oral cancer. In addition, Tang et al (32) demonstrated that knockdown of circ_0081143 suppressed hypoxia-induced migration, invasion and EMT in gastric cancer cells via the miR-497-5p/EGFR axis. Xiong et al (33) reported that WAP four-disulfide core domain 2 (WFDC2) levels negatively correlated to the Gleason score and incidence of metastasis in patients with prostate cancer. WFDC2 binds to the extracellular domain of EGFR and inhibits the EGFR/Akt/GSK3β/Snail signaling pathway, thus blocking the metastasis of prostate cancer (33). In the present study, EGFR was the direct target of miR-27b-3p. By targeting EGFR, miR-27b-3p attenuated CSCC proliferation through the inhibition of Akt phosphorylation and cyclin D1 downregulation.

The MMP family is closely related to tumor migration and invasion (34). Wang et al (35) suggested that clusterin (CLU) promotes cell proliferation and survival in hepatocellular carcinoma (HCC) and that CLU levels are associated with poor survival of patients with HCC and relapse. CLU accelerates HCC metastasis by activating the EIF3I/Akt/MMP13 signaling pathway (35). Overexpressed TLR-9 promoted the expression of MMP-13 and triggered the migratory and invasive abilities of prostate cancer (36). Zhang et al (37) reported that sirtuin 1 (SIRT1) is significantly upregulated in gastric cancer tissue samples, and via activating the STAT3/MMP-13 signaling pathway, SIRT1 deficiency facilitates the migration of gastric cancer both in vivo and in vitro. MMP-13 was validated as a target gene of miR-27b-3p in the present study. Overexpression of miR-27b-3p upregulated E-CAD in A-431 and Colo-16 cells by downregulating MMP-13, thus inhibiting the metastasis and EMT of CSCC cells.

In conclusion, miR-27b-3p reduces the proliferation, migration and invasion of CSCC cells by binding to the 3′-UTRs of EGFR and MMP-13. Thus, this miRNA may represent a potential diagnostic marker and therapeutic option for CSCC.

Acknowledgements

Not applicable.

Funding

This project was funded by Guangdong medical science and Technology Research Fund (grant no. A2019289).

Availability of data and materials

The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.

Authors' contributions

DL and ZZ made substantial contributions to conception and design, acquisition, analysis and interpretation of data. DL and ZZ performed the experiments. ZZ drafted the manuscript and revised it critically for important intellectual content. DL and ZZ confirmed the authenticity of the raw data. Both authors read and approved the final manuscript.

Ethics approval and consent to participate

Not applicable.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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October-2021
Volume 22 Issue 4

Print ISSN: 1792-1074
Online ISSN:1792-1082

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Spandidos Publications style
Liang D and Zhang Z: MicroRNA‑27b‑3p inhibits the proliferation and invasion of cutaneous squamous cell carcinoma by targeting EGFR and MMP‑13. Oncol Lett 22: 729, 2021.
APA
Liang, D., & Zhang, Z. (2021). MicroRNA‑27b‑3p inhibits the proliferation and invasion of cutaneous squamous cell carcinoma by targeting EGFR and MMP‑13. Oncology Letters, 22, 729. https://doi.org/10.3892/ol.2021.12990
MLA
Liang, D., Zhang, Z."MicroRNA‑27b‑3p inhibits the proliferation and invasion of cutaneous squamous cell carcinoma by targeting EGFR and MMP‑13". Oncology Letters 22.4 (2021): 729.
Chicago
Liang, D., Zhang, Z."MicroRNA‑27b‑3p inhibits the proliferation and invasion of cutaneous squamous cell carcinoma by targeting EGFR and MMP‑13". Oncology Letters 22, no. 4 (2021): 729. https://doi.org/10.3892/ol.2021.12990