Open Access

Lidocaine suppresses the malignant behavior of gastric cancer cells via the c‑Met/c‑Src pathway

  • Authors:
    • Wei Zeng
    • Ze Ting Xing
    • Mei Yun Tan
    • Yan Wen Wu
    • Chun Yuan Zhang
  • View Affiliations

  • Published online on: February 25, 2021     https://doi.org/10.3892/etm.2021.9868
  • Article Number: 424
  • Copyright: © Zeng et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The present study was designed to investigate the role and mechanism of action behind the action of lidocaine in gastric cancer cells. Lidocaine was tested for its potential role in affecting the viability of cells using Cell Counting Kit‑8 (CCK‑8) assays. It was found that there was a decreased MKN45 cell viability upon lidocaine treatment in a dose‑dependent manner. Phosphorylated c‑Met, phosphorylated c‑Src, c‑Met and c‑Src levels were detected using western blotting following lidocaine or hepatocyte growth factor (HGF) intervention. It was found that the phosphorylation levels of c‑Met and c‑Src were markedly reduced by lidocaine treatment, with this effect being further relieved by the addition of HGF. Subsequently, whether lidocaine repressed the malignant biological properties of gastric cancer cells through the c‑Met/c‑Src axis was further investigated through the detection of epithelial‑mesenchymal transition markers (N‑caderin and vimentin), wound healing and transwell assay analysis. In addition, cell apoptosis and the levels of apoptosis‑related proteins were determined using TUNEL and western blot assays, respectively. The results demonstrated that the malignant behavior of cells were notably repressed upon lidocaine treatment, but the addition of HGF markedly reversed these effects, indicating that the effects of lidocaine on supressing the malignant behaviour of cells could be mediated through the c‑Met/c‑Src axis. Subsequently, whether lidocaine affected the sensitivity of cells to cisplatin or 5‑FU was analyzed using a CCK‑8 assay. Enhanced sensitivity of cells to cisplatin or 5‑FU was observed when treated in combination with lidocaine. The present study concluded that the involvement of the c‑Met/c‑Src pathway in the biological behaviour of MKN45 cells was mediated by lidocaine. Therefore, lidocaine may have the potential to suppress the malignant behaviour and proliferation of gastric cancer cells.

Introduction

Gastric cancer is the fifth most common cancer worldwide (1). Surgical treatment is the first choice for gastric cancer; however, the 5-year survival rate is only 20-30% due to low early diagnosis rates and high postoperative recurrence and metastasis rates (2).

Lidocaine is a local anesthetic which can effectively inhibit the biological activity of a variety of cancer types. In vivo and in vitro studies have indicated the antitumor effects of lidocaine in gastric cancer (3-5). Mechanistically, lidocaine has been found to decrease Src activation (6-8). A recent study suggested that lidocaine can inhibit the proliferative and invasive capabilities of c-Met positive MKN45 cells (3). c-Met is a member of the protein tyrosine kinase receptor superfamily, which is encoded by the mesenchymal-epithelial transition (MET) proto-oncogene and mainly produced by epithelial cells (9). c-Met expression in gastric cancer tissues is higher compared with that in healthy tissues and is associated with invasion, metastasis and poor prognosis of gastric cancer, but is not associated with sex, age, size, location or differentiation degree of the tumor (10-12). MET amplification has been found to be common feature in gastric cancer and its inhibition contributes to apoptosis of gastric cancer cells (13-16). c-Src, a non-receptor tyrosine kinase, is closely associated with the proliferation and survival of cancer cells (17,18). Hepatocyte growth factor (HGF) functions as a natural endogenous ligand of the MET receptor, which forms a signaling pathway with c-Met, which is closely related to the occurrence, development, metastasis and prognosis of gastric cancer (9,19,20). In most types of gastric cancer, the inhibition of this signaling pathway exerts an antiproliferative effect and induces apoptosis in gastric cancer cells (13). c-Met/c-Src signaling has been reported to play a vital role on the growth of MET-activated gastric cancer cells (13). Although the potential anti-tumor effects of lidocaine have been reported, the role and mechanism of action of lidocaine remain unclear. The present study aimed to investigate the efficacy of lidocaine against the malignant behavior and proliferation of gastric cancer cells and its mechanism of action.

Materials and methods

Cell culture

Human gastric carcinoma cells MKN45 (ATCC), a c-MET-positive cell line, were cultured in RPMI-1640 medium (Thermo Fisher Scientific, Inc.) containing 10% FBS at 37˚C after resuscitation until adherent. Once the cell density reached 80%, cells were digested with 0.25% trypsin and passaged at a 1:3 ratio of cells: Medium. MKN45 cells were continuously cultured using the same conditions for subsequent experiments.

Cell Counting Kit-8 (CCK-8) assay

MKN45 cells were cultured to the logarithmic stage and seeded into 96-well plates (2x103 cells/well). After overnight culture, the culture solution was discarded. Media containing lidocaine (Selleck Chemicals) at final concentrations of 1, 5 and 10 mM was added to the cells for incubation for 48 h at 37˚C. Each lidocaine concentration treatment was performed as five separate assays. In analyzing the influence of lidocaine on the sensitivities of cells for cisplatin (cat. no. A10221; Adooq Bioscience) or 5-FU (cat. no. CSN19496, CSNpharm, Inc.), cells were cultured in RPMI-1640 medium containing cisplatin (0.25 or 0. 5 µg/ml) or in combination with lidocaine (10 mM) or HGF (40 ng/ml, cat. no. AP3513; Adooq Bioscience). Following culture for 48 h, 10 µl CCK-8 solution was added for incubation for 2 h at 37˚C (Abcam). The absorbance at a wavelength of 450 nm was detected using a microplate reader.

Western blotting

Total protein was extracted from MKN45 cells using RIPA lysis buffer (Beijing Solarbio Science & Technology Co., Ltd.). Protein concentration was determined using a BCA kit. A total of 30 µg protein was obtained, mixed with loading buffer and loaded into 10% polyacrylamide gels. Polyacrylamide gel electrophoresis was performed to separate the proteins. The proteins were then transferred to PVDF membranes and 5% skimmed milk was used to block the membranes at room temperature for 1 h. Subsequently, the membranes were incubated with primary antibodies [c-Met, cat. no. ab216574, 1:1,000; phosphorylated (p)-c-Met, cat. no. ab5662, 1:1,000; c-Src, cat. no. ab16885, 1:1,000; p-c-Src, cat. no. ab40660, 1:2,000; N-cadherin, cat. no. ab76011, 1:5,000; vimentin, cat. no. ab92547, 1:2,000; GAPDH, ab8245, 1:10,000; all from Abcam] at 4˚C overnight and secondary antibodies [horseradish peroxidase (HRP)-conjugated rabbit anti-mouse, cat. no. ab47827, 1:10,000; HRP-conjugated goat anti-Rabbit IgG, ab97040, 1:10,000; Abcam] at room temperature for 1 h. Protein bands were visualized using a gel imaging system (Bio-Rad Laboratories, Inc.) following addition of ECL developing reagent (Beyotime Institute of Biotechnology). The gray value of protein bands was analyzed using Image J software 1.46r (National Institutes of Health). The grayscale ratio of target proteins to GADPH was then calculated.

Wound healing assay

MKN45 cells were seeded into 6-well plates (2x106 cells/well) and cultured for 24 h. When cell confluence reached 100%, linear scratches were made using a 200-µl sterile pipette tip and photographed as the controls. After being washed with PBS, the cells were treated with serum-free medium containing lidocaine (10 mM) or HGF (40 ng/ml) at 37˚C for 48 h. Images were then captured using a light microscope (magnification, x200; Olympus Corporation). The migration rate was calculated using the formula: Migration rate=(T0 h area-T48 h area)/T0 h area x100%.

Transwell assay

The invasive capabilities of MKN45 cells were detected using Transwell assays. Matrigel (50 mg/l) was added to the upper chamber of the Transwell at 4˚C to dry for 5 h (0.4 µM pore size; BD Biosciences). Once the cells were digested and collected, the cell suspension (5x104 cells/200 µl) was prepared using RPMI-1640 medium containing no FBS and seeded into the Transwell upper chamber. Medium containing 10% FBS was added into the lower chamber. After 48 h at 37˚C, the chamber was removed and cells in the upper chamber were wiped off using a cotton swab. The cells were fixed with 4% paraformaldehyde for 15 min at room temperature and then stained with 0.1% crystal violet for 30 min at room temperature (Sigma Aldrich; Merck KGaA) and observed under a light microscope (magnification x200).

TUNEL assay

Following treatment of MKN45 cells, cells (1x106 cells) were collected added to polylysine slides and fixed using 4% paraformaldehyde for 25 min at room temperature. Subsequently, 0.2 % Triton X-100 was added to the sections and incubated for 5 min at room temperature. Apoptotic cells were stained with TUNEL reagent (50 µl) for 1 h at room temperature and DAPI for 10 min (0.4 µg/ml, blue) in the dark, according to the instructions of the TUNEL Fluorescence Assay kit (Roche Diagnostics). Apoptosis was observed under a fluorescence microscope (Roche Diagnostics). In total, five non-overlapping fields were randomly selected. The apoptosis levels of the cells were calculated using the following method: (The number of positive cells in each field/the total number of all cells in the field) x100%.

Statistical analysis

Data are presented as the mean ± SD. Experimental data among the various groups were compared using one-way ANOVAs followed by post hoc Tukey's tests using GraphPad 7.0 (GraphPad Software, Inc.). Each experiment was repeated at least three times.

Results

Effects of lidocaine on the c-Met/c-Src axis in MKN45 cells

To evaluate the effects of lidocaine on cell growth, MKN45 cells were exposed to various concentrations of lidocaine for 48 h and the cell viability was measured. Various concentrations of lidocaine were found to inhibit MKN45 cell proliferation in a dose-dependent manner (Fig. 1A), indicating that MKN45 cells are sensitive to lidocaine. To further investigate the mechanism of action of lidocaine, western blot assays were performed to analyze the protein expression and phosphorylation levels of c-Met and c-Src. Although there were no marked changes in the expression levels of c-Met and c-Src in MKN45 cells upon treatment with various concentrations of lidocaine, a significant decrease was observed in the phosphorylation levels of c-Met and c-Src (Fig. 1B and C).

HGF suppresses the efficacy of lidocaine in MKN45 cells via the c-Met/c-Src axis

The aforementioned findings indicated that there was an inhibitory effect of lidocaine on c-Met and c-Src. It has been reported that c-Met/c-Src activation is closely related to the overall survival rate of patients with gastric cancer and is considered as a potential therapeutic target for gastric cancer (20-24). As such, it was hypothesized that the c-Met/c-Src pathway may mediate the suppressive effects of lidocaine on MKN45 cell proliferation. To validate this hypothesis, MKN45 cells were pre-treated with HGF (40 ng/ml), followed by treatment with various concentrations of lidocaine (1, 5 and 10 mM) for 48 h (Fig. 2). HGF is a known activator of c-MET (25). A marked increase in the phosphorylation levels of c-Met and c-Src was observed in MKN45 cells treated with the various concentrations of lidocaine in the presence of HGF, when compared with lidocaine treatment alone. In addition, no marked changes in the expression of c-Met and c-Src were observed in MKN45 cells following lidocaine or HGF treatment.

Lidocaine suppresses the malignant behavior of MKN45 cells

Subsequently, the present study further evaluated the influence of lidocaine on the malignant behavior of MKN45 cells through analyzing the abilities of cell migration and invasion, as well as the expression of EMT-related markers. Western blot assays were performed to analyze the expression of N-cadherin and vimentin, while migration and invasion were investigated using wound healing and Transwell assays. A significant reduction in N-cadherin and vimentin protein expression levels was found in MKN45 cells exposed to lidocaine, while HGF reversed these effects (Fig. 3A). Metastasis is one of the factors that impede successful treatment of patients with gastric cancer. Therefore, in vitro migration and invasion assays were subsequently performed in MKN45 cells following lidocaine or HGF treatment. MKN45 cells exposed to 10 mM lidocaine exhibited significantly higher levels of both migration and invasion, while HGF treatment reversed these effects (Fig. 3B and C).

Lidocaine inhibits the apoptosis of MKN45 cells

Fluorescein-dUTP was used to analyze cell apoptosis using a TUNEL assay. Following treatment of MKN45 cells with lidocaine (10 mM), a marked increase in the number of cells showing green fluorescence was observed, indicating an increase in the extent of cell apoptosis compared with the control group. HGF (40 ng/ml) treatment significantly reduced the promoting effects of lidocaine on cell apoptosis (Fig. 4A and B). The expression of apoptosis-related proteins (Bcl-2, Bax and cleaved caspase 3) in MKN45 cells was detected using western blot assays. Significant changes in all of the aforementioned protein expression levels in cells exposed to lidocaine were found compared with the control group (Fig. 4C and D). The expression levels of the pro-apoptotic protein Bcl-2 were significantly decreased, whilst Bax and cleaved caspase3 expression was significantly increased. The results indicated that lidocaine induced cell apoptosis by potentially activating the intrinsic c-Met/c-Src pathway.

Lidocaine enhances the sensitivity of cells to chemotherapy

The resistance of tumor cells to chemotherapy drugs limits the efficacy of drugs and is a major obstacle to effective cancer chemotherapy (26). The sensitivity of MKN45 cells exposed to lidocaine in combination with cisplatin to chemotherapy was assessed using a CCK-8 assay. Cisplatin inhibited cell viability in a dose-dependent manner, the effects of which were significantly enhanced when combined with lidocaine treatment (Fig. 5A). The synergistic inhibitory effects of lidocaine were also observed in MKN45 cells treated with 5-FU (Fig. 5B). Moreover, the promoting effects of HGF on cell viability were observed in cells treated with lidocaine, cisplatin when compared with co-treatment of cisplatin and lidocaine. Similarly, the effects of the combination treatment of 5-FU and lidocaine on cell viability were reversed by HGF.

Discussion

Lidocaine is a local anesthetic, with strong and lasting effects and good surface penetration (27). Intravenous lidocaine injections may effectively relieve pain and reduce fentanyl consumption during the early postoperative period (28). Recent studies have demonstrated a possible regulatory mechanism of action for lidocaine through suppressing the proliferation of gastric cancer cells, which is associated with ERK1/2 phosphorylation, the MAPK pathway and altering the expression profiles of microRNAs (3-5). EMT activation is involved in the cell invasion and metastasis of a variety of cancer types (29,30). In the present study, lidocaine downregulated the expression levels of the EMT markers, N-cadherin and vimentin, the effects of which were inhibited by HGF treatment. The HGF/c-Met pathway has previously been found to induce EMT in gastric cancer cells (31). Based on these experimental data, lidocaine may suppress the EMT process by inhibiting the activation of the c-Met/c-Src signaling pathway.

The proliferative and anti-apoptotic functions of HGF have been previously confirmed in gastric cancer cells, consistent with the results of the present study (32). Abnormal HGF levels and apoptosis dysregulation are closely associated with the pathogenesis of gastric cancer (33). Detection of growth factors and apoptosis-related proteins has revealed an increased HGF expression and dysregulated Bax/Bcl-2 in patients with gastric cancer (34). The present study found that lidocaine decreased Bcl-2 levels and increased the levels of Bax and cleaved caspase3 through the c-Met/c-Src pathway, and also revealed that lidocaine may promote mitochondrial mediated apoptosis pathway to induce cell apoptosis. Similar roles for lidocaine in apoptosis have also been reported a number of malignancies, including lymphoma, colorectal cancer and cervical cancer (35-37). The present study demonstrated that promoting apoptosis through lidocaine treatment resulted in the inhibition of cell proliferation, indicating the potential anti-tumor effects of lidocaine on gastric cancer cells.

HGF was shown to suppress the effects of lidocaine in MKN45 cells. HGF is cytotoxic and serves as a ligand for c-Met (38). HGF/c-Met signaling plays a vital role in normal biological functions as well as cancer pathology, where it has been implicated in tumor metastasis (23,39). Inhibition of this pathway may sensitize tumor cells to chemotherapy (24). It has previously been shown that c-MET-mediates the malignant behaviors in NT2D1 non-seminoma cells, as well as being implicated in the recruitment of c-Src, which has been associated with the aggressiveness of some types of cancer (40). In the present study, lidocaine alone markedly suppressed cell proliferation, while its combination with cisplatin resulted in the synergistic suppression of cell proliferation. Furthermore, HGF treatment reversed these effects, indicating that the inhibition of c-Met/c-Src with lidocaine enhanced the anti-proliferative effects of cisplatin.

Taken together, the findings of the present study provided evidence supporting a potential role of lidocaine against the malignant behavior of gastric cancer cells and provided a novel insight into the mechanisms of action of lidocaine in gastric cancer.

Acknowledgements

No applicable.

Availability of data and materials

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

Authors' contributions

WZ, ZTX, MYT, YWW and CYZ conceived and designed the study, performed the experiment, collected, analyzed and interpreted the data, and revised the manuscript. WZ and CYZ wrote the manuscript. All authors read and approved the final manuscript. WZ and CYZ confirm the authenticity of all the raw data.

Ethics approval and consent to participate

No applicable.

Patient consent for publication

No applicable.

Competing interests

All authors declare that they have no competing interests.

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Spandidos Publications style
Zeng W, Xing ZT, Tan MY, Wu YW and Zhang CY: Lidocaine suppresses the malignant behavior of gastric cancer cells via the c‑Met/c‑Src pathway. Exp Ther Med 21: 424, 2021
APA
Zeng, W., Xing, Z.T., Tan, M.Y., Wu, Y.W., & Zhang, C.Y. (2021). Lidocaine suppresses the malignant behavior of gastric cancer cells via the c‑Met/c‑Src pathway. Experimental and Therapeutic Medicine, 21, 424. https://doi.org/10.3892/etm.2021.9868
MLA
Zeng, W., Xing, Z. T., Tan, M. Y., Wu, Y. W., Zhang, C. Y."Lidocaine suppresses the malignant behavior of gastric cancer cells via the c‑Met/c‑Src pathway". Experimental and Therapeutic Medicine 21.5 (2021): 424.
Chicago
Zeng, W., Xing, Z. T., Tan, M. Y., Wu, Y. W., Zhang, C. Y."Lidocaine suppresses the malignant behavior of gastric cancer cells via the c‑Met/c‑Src pathway". Experimental and Therapeutic Medicine 21, no. 5 (2021): 424. https://doi.org/10.3892/etm.2021.9868