Hesperidin inhibits tobacco smoke‑induced pulmonary cell proliferation and EMT in mouse lung tissues via the p38 signaling pathway
- Authors:
- Published online on: November 29, 2022 https://doi.org/10.3892/ol.2022.13616
- Article Number: 30
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Copyright: © Liang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
Lung cancer is one of the most common causes of cancer-related deaths in men and women worldwide (1,2). Tobacco smoke (TS) is associated with multiple types of cancer, but especially lung cancer (3,4). Epidemiological studies have revealed a link between TS and lung cancer initiation and development (5–7). TS accounts for 80% of female and 90% of male lung cancer cases (8,9). Lung cancer contributes to >3,000 deaths per day and is the leading cause of cancer-related deaths in men and women (2). However, the molecular pathogenesis of TS-induced lung cancer still remains largely unknown.
Lung cancer is a multicentric and multistep phenomenon, which sequentially accumulates molecular and genetic abnormalities (9). Abnormal cell proliferation and epithelial-mesenchymal transition (EMT) help in developing lung cancer and can be activated by carcinogens (10–12). It has been demonstrated that exposure of cells or mice to TS accelerates the EMT process, which is characterized by changes in the expression of EMT markers, including decreased E-cadherin, and increased vimentin and N-cadherin (13–15). In addition, TS-induced EMT initiates early-stage carcinogenesis (16–18). Cancer is a group of diseases characterized by abnormal cell proliferation, and abnormal cell proliferation is a key step that may promote the occurrence and development of cancer (19–22). Studies have suggested that exposure to TS induces abnormal cell proliferation accompanied by changes in the expression of PCNA or Ki-67 (23–25). To the best of our knowledge, the molecular mechanism of TS-induced abnormal pulmonary cell proliferation and EMT is unclear. However, further investigations may provide strategies for early treatment and intervention in lung cancer.
MAPKs control cellular processes, such as proliferation, apoptosis, angiogenesis, cell motility and differentiation (26,27). Therefore, MAPKs can contribute to tumorigenesis (28–30). p38 is a member of the MAPK family, participating in the occurrence and development of TS-induced lung cancer by regulating the EMT process (30–36). However, the functional mechanism of p38 in lung tissues is not clear.
Dietary phytochemicals are potentially anticancerous and flavonoids have been reported to inhibit cancer progression (37). Hesperidin is a citrus flavone, which is the abundant polyphenol in citrus fruits and is commonly used in Traditional Chinese Medicine (37,38). Hesperidin exerts a range of biological and pharmacological activities, including antioxidant, anti-inflammatory and anticancer effects, with minimal or no side effects (39–41). Hesperidin is anticancerous for tumors, such as breast, gastric and lung tumors. The anticancer activity of hesperidin has been well studied (37,39,42,43). However, limited work has been conducted on its potential to treat TS-induced abnormal cell proliferation and EMT in lung tissues.
The present study examined the regulation of the p38 pathway in TS-induced abnormal lung cell proliferation and EMT. The preventive effects of hesperidin were determined by examining the lung tissues of treated mice. The findings may provide a novel avenue for determining the pathogenesis and early interventions of TS-induced lung tumorigenesis.
Materials and methods
Chemicals and reagents
Phosphorylated p38 (catalogue number, 4511T; 1:500), phosphorylated c-Fos (catalogue number, 5348T; 1:1,000), p38 (catalogue number, 8690T; 1:1,000), c-Fos (catalogue number, 2250T; 1:1,000), E-cadherin (catalogue number, 3195T; 1:1,000) and N-cadherin (catalogue number, 13116T; 1:1,000) antibodies were purchased from Cell Signaling Technology, Inc. Vimentin (catalogue number, MB65651; 1:1,000), proliferating cell nuclear antigen (PCNA) (catalogue number, MB0156; 1:500) and GAPDH (catalogue number, BS65483M; 1:2,000) antibodies were purchased from Bioworld Technology, Inc. Horseradish peroxidase-conjugated secondary antibodies were purchased from Invitrogen; Thermo Fisher Scientific, Inc. (catalogue numbers, 31430 and 31460; 1:2,000). Primers for Vimentin, E-cadherin, N-cadherin, PCNA and GAPDH (Table I) were synthesized by Invitrogen; Thermo Fisher Scientific, Inc. SB203580 was purchased from MilliporeSigma. The sources of other materials are indicated throughout the text.
Mice and exposure to TS
Male 8-week-old BALB/c mice weighing 18–22 g (n=60) were purchased from the Animal Research Center of Jiangsu University (Zhenjiang, China). Mice were acclimated for 1 week prior to TS exposure. The mice were housed in polypropylene cages at 22±0.5°C and 40–60% humidity with 12 h light/dark cycles at the Animal Care Facility of Jiangsu University (Zhenjiang, China). Water and a normal diet were provided ad libitum. All of the mouse experiments were approved by the Animal Care and Use Committee of Jiangsu University and efforts were made to minimize suffering and distress. Mice in the TS group (n=18) were exposed in the smoking apparatus (Beijing Huironghe Technology Co., Ltd.) for 6 h daily for 12 weeks. The filtered air (FA) control group (n=18) mice were exposed to filtered air in the smoking apparatus. After TS exposure, mice in each group were provided with water and a normal diet. Filter-less 3R4F Kentucky reference cigarettes (containing 9.4 mg tar and 0.76 mg nicotine per cigarette) were used as the TS source. In the TS + DMSO group (n=12), mice were injected with sterile DMSO (catalogue number, D2650; MilliporeSigma) and exposed to TS, while in the TS + SB203580 group (n=6), mice were injected with SB203580 (1 mg/kg body weight) and exposed to TS. SB203580 was dissolved in sterile DMSO and administered intraperitoneally every other day. In the TS + hesperidin group (n=6), mice were exposed to TS and received 30 mg/kg hesperidin (catalogue number, HY-15337; MedChemExpress) every other day by gavage, and a normal diet. SB203580 and hesperidin were dissolved in DMSO, and further diluted in 0.9% saline to the final concentration. TS was generated by a smoke machine, which pumped the smoke from the burning cigarette at a constant rate (5 min/cigarette). Smoke was delivered to the whole-body exposure chambers with total particulate matter (TPM) of 85 mg/m3. The exposures were monitored and characterized as: Carbon monoxide (16.75±2.47 ppm) and TPM (0 mg/m3) for the control group; and carbon monoxide (181.05±14.79 ppm) and TPM (84.83±5.19 mg/m3) for the TS exposure group. Animal health and behavior were monitored twice a week and the experiment lasted for 12 weeks. There was no accidental death of mice during the experiment, and all mice were euthanized at the end of the experiment. Mice were sacrificed by cervical dislocation and death was confirmed by the sound of cervical spine fracture and the absence of breathing (44).
Western blot analysis
Lung tissues were homogenized using a full automatic sample rapid grinding instrument (Shanghai Jingxin Industrial Development, Co., Ltd.) in lysis buffer containing 1X protease inhibitor cocktail (Pierce; Thermo Fisher Scientific, Inc.) and centrifuged at 12,000 × g at 4°C for 15 min. Protein concentration was determined by bicinchoninic acid assay. Equal amounts of proteins (60 µg) were fractionated by electrophoresis via 7.5–10% SDS-PAGE and transferred to a PVDF membrane (MilliporeSigma). The membrane was blocked using 5% non-fat milk at 25°C for 1 h and incubated overnight with monoclonal antibody at 4°C. The membranes were washed with tris-buffered saline with 0.1% Tween-20 and probed with horseradish peroxidase-conjugated secondary antibody diluted in 5% skimmed milk. GAPDH served as the loading control. The membranes were developed with ECL kit (catalogue number, E412-02; Vazyme Biotech Co., Ltd.). For densitometric analyses, protein bands on the blots were measured with ImageJ 1.8.0.345 (National Institutes of Health).
Reverse transcription-quantitative PCR (RT-qPCR)
Total RNA from the lung tissues of the mice was isolated using TRIzol™ (Gibco; Thermo Fisher Scientific, Inc.). A total of 2 µg RNA was reverse transcribed into cDNA using AMV Reverse Transcriptase (Promega Corporation) and the HiScript® III 1st Strand cDNA Synthesis Kit (catalogue number, R312-01; Vazyme Biotech Co., Ltd.) was used according to the manufacturer's protocol. qPCR was performed using AceQ® qPCR SYBR Green Master Mix (Vazyme Biotech Co., Ltd.) and a StepOnePlus™ Real-Time PCR System (Applied Biosystems; Thermo Fisher Scientific, Inc.). The thermocycling conditions were as follows: 95°C for 5 min, followed by 40 cycles at 95°C for 15 sec, 60°C for 15 sec, 72°C for 20 sec and a 65–95°C drawing dissociation curve (45). GAPDH expression was used as the normalization control. Fold-changes in the expression of each gene were calculated using the 2−ΔΔCq (46). The primers used are shown in Table I.
Immunohistochemistry
Immunohistochemistry was performed according a previously reported method (47). Briefly, tissues were fixed in 4% buffered formalin at room temperature for 24 h. 5-µm paraffin-embedded continuous sections were de-waxed in xylene and rehydrated in graded alcohol. Next, the endogenous peroxidase activity was quenched by incubating the slices in 3% (v/v) H2O2 in methanol. Antigen-retrieval was performed by incubating the sections in citrate buffer (pH 6.0) and the non-specific binding was blocked using 5% bovine serum albumin at 37°C for 30 min. After incubation overnight with E-cadherin (catalogue number, 3195T; 1:200; Cell Signaling Technology, Inc.) and Vimentin (catalogue number, MB9006; 1:100; Bioworld Technology, Inc.) at 4°C, the sections were subsequently washed with phosphate-buffered solution, and then incubated with biotinylated immunoglobulin G and SABC (catalogue number, SA1020; Wuhan Boster Biological Technology, Ltd.) for 1 h. Image acquisition was performed with a light microscope (Nikon Solar Eclipse Ti-S; Nikon Corporation).
Statistical analysis
Statistical analysis was performed using SPSS 16.0 (SPSS, Inc.). The data of three repeated experiments are presented as the mean ± standard deviation. One-way ANOVA, followed by Tukey's post hoc test, was used to analyze the statistical differences among multiple groups. The differences between two groups were analyzed using an unpaired t-test. P<0.05 was considered to indicate a statistically significant difference.
Results
TS-induced abnormal EMT and cell proliferation in mouse lung tissues
TS is the dominant risk factor for lung cancer (3,4). Abnormal EMT and cell proliferation initiate TS-induced lung cancer (16,25). The altered EMT and cell proliferation marker (E-cadherin, vimentin, N-cadherin and PCNA) levels were screened in mouse lung tissues after 12 weeks of TS exposure. The RT-qPCR results showed a reduction in E-cadherin mRNA levels after TS exposure compared with the levels in the FA control group, whereas vimentin, N-cadherin and PCNA levels were elevated (Fig. 1A). The western blotting results revealed that TS reduced E-cadherin protein expression compared with that in the FA group, but increased vimentin, N-cadherin and PCNA expression (Fig. 1B and C). In order to further clarify that smoking can induce EMT in lung tissue of mice, vimentin and E-cadherin were detected by immunohistochemistry. It was demonstrated that TS increased vimentin expression but decreased E-cadherin expression compared with that in the FA group (Fig. 1D). Therefore, TS exposure induced abnormal EMT and cell proliferation in mouse lung tissues.
TS-mediated abnormal EMT and cell proliferation are inhibited by p38 pathway inhibition
To determine whether the abnormal lung EMT and proliferation processes triggered by TS are associated with the p38 pathway, the levels of p38, phosphorylated p38 and phosphorylated c-fos in mouse lung tissues were investigated. The western blotting results revealed an increase in phosphorylated p38 and phosphorylated c-Fos levels upon TS exposure compared with that in the FA group (Fig. 2A). In addition, the ratio of phosphorylated protein to total protein was also evaluated, and TS was shown to increase the ratio of phosphorylated p38 and phosphorylated c-Fos compared with the FA group (Fig. 2B).
To further verify the role of p38 pathway, BALB/c mice were treated with SB203580. After 12 weeks of treatment with SB203580, the upregulation of phosphorylated p38 and phosphorylated c-Fos induced by TS was significantly inhibited, as demonstrated by western blotting (Fig. 3A). In addition, the ratio of phosphorylated protein to total protein evaluated by density analysis showed that SB203580 reduced the proportion of the TS-induced increase in phosphorylated p38 and phosphorylated c-Fos (Fig. 3B).
The expression of EMT and proliferation markers was also detected after 12 weeks treatment. These results showed that alterations in the levels of EMT and proliferation markers induced by TS were significantly suppressed by inhibition of the p38 pathway in mouse lung tissues (Fig. 4). Therefore, TS-mediated abnormal EMT and cell proliferation were inhibited by the inhibition of the p38 pathway as shown in the in vivo experiments in mice.
Hesperidin inhibits abnormal EMT and cell proliferation in mouse lung tissues elicited by TS
BALB/c mice were administered with hesperidin and exposed to TS for 12 weeks. The downregulation of E-cadherin was reduced, and the upregulation of vimentin, N-cadherin and PCNA was reduced compared with that in the TS group (Fig. 5). The preventive effects of hesperidin on TS-mediated abnormal EMT and cell proliferation in mouse lung tissues were evident.
The effect of hesperidin on TS-induced abnormal pulmonary EMT and cell proliferation through its effects on the p38 pathway was also studied. It was found that hesperidin (30 mg/kg) reversed the increased expression of phosphorylated p38 and phosphorylated c-fos induced by TS (Fig. 6A). In addition, the ratio of phosphorylated protein to total protein evaluated by density analysis showed that hesperidin reduced the phosphorylation level of p38 and c-Fos compared with that in the TS group (Fig. 6B).
Discussion
TS is the leading cause of lung cancer and promotes initiation and progression of pulmonary tumorigenesis (5–7,9,48). The underlying molecular mechanism of TS causing lung cancer remains unclear. The present study focused on TS-induced abnormal EMT and cell proliferation in mouse lungs. The study demonstrated that the p38 pathway regulates TS-associated abnormal pulmonary EMT and cell proliferation. The data presented in the present study indicated that hesperidin suppressed the p38 pathway to prevent TS-induced abnormal pulmonary EMT and cell proliferation. The findings provide insights into the molecular mechanisms of TS-mediated pulmonary tumorigenesis, and provide potential targets for lung cancer intervention.
It is well known that both normal cells and cancer cells can proliferate, but the proliferation of cancer cells is abnormal and uncontrolled (48,49). Antiproliferative activity can inhibit the proliferation of all cells, while antitumor activity only targets cancer cells with abnormal proliferation and has little effect on normal cells. EMT is a common cellular process where cells lose epithelial properties and acquire mesenchymal properties (50,51). Normal cells can acquire EMT properties, which may be an important feature in the carcinogenic process (51). The tumor cell EMT process is a strategy of ‘immune escape’ and a means to improve invasion and metastasis (52,53). Carcinogens can stimulate abnormal cell proliferation and EMT, leading to lung cancer (10–12). TS-induced abnormal EMT and cell proliferation regulate early events in cancer (54–56). In the present study, the change in the expression levels of EMT and proliferation markers indicated abnormal EMT and cell proliferation in the lungs of mice exposed to TS. This was demonstrated through western blot analysis and RT-qPCR where reduced levels of E-cadherin, and increased levels of vimentin, N-cadherin and PCNA were observed. Immunohistochemical staining also revealed increased vimentin expression and decreased E-cadherin expression.
A number of signaling pathways control abnormal EMT and cell proliferation, including the Wnt/β-catenin, MAPK and NF-κB signaling pathways (57–59). The MAPK pathway regulates physiological processes and pathologies, such as cell proliferation, apoptosis, inflammation, cell motility, differentiation and tumorigenesis (60,61). p38 is an important member of the MAPK family and participates in the development of cancer by regulating EMT and abnormal cell proliferation (30,31,62). The present study demonstrated that TS-mediated abnormal pulmonary EMT and cell proliferation were associated with the upregulation of phosphorylated p38 and phosphorylated c-Fos.
The role of the p38 pathway in abnormal pulmonary EMT and cell proliferation has been previously studied. In these studies, mice were treated with SB203580, which inhibited p38 activation (63,64). In the present study, SB203580 inhibited the upregulation of phosphorylated p38 and phosphorylated c-Fos induced by TS. The suppressed p38 pathway inhibited TS-mediated abnormal pulmonary EMT and cell proliferation, as shown by elevated E-cadherin levels and decreased vimentin, N-cadherin and PCNA levels.
Dietary phytochemicals, such as hesperidin, are considered to contribute to cancer prevention (37,38). The safety of hesperidin and its anticancer activity have been previously demonstrated (41,65,66). The intervention of hesperidin in TS-induced abnormal pulmonary EMT and cell proliferation is through the p38 pathway, where phosphorylated p38 and phosphorylated c-Fos are attenuated by hesperidin.
The results of the present study illustrated that the p38 pathway positively regulated TS-induced abnormal pulmonary EMT and proliferation. The interventive effects of hesperidin were demonstrated, which may aid the understanding of the mechanisms and chemoprevention of TS-induced lung cancer.
Acknowledgements
The authors would like to thank Professor Caiyun Zhong (Nanjing Medical University, Nanjing, China) for providing guidance on mouse model construction and research design.
Funding
The present study was supported by the project of Social Development in Zhenjiang (grant no. SH2021045), the Foundation for Excellent Young Teachers of Jiangsu University (grant no. 5521280013), and Zhenjiang Key Laboratory of High Technology Research on Exosomes Foundation and Transformation Applications (grant no. SS2018003).
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
ZL, YW and YZ designed the study and wrote, revised the manuscript. YZ and YX performed the experiments. XZ and YX analyzed the data. All authors read and approved the final manuscript. ZL and YW confirm the authenticity of all the raw data.
Ethics approval and consent to participate
Mice were handled as per the guidelines of the Animal Care and Welfare Committee of Jiangsu University (Zhenjiang, China). The study protocol was approved by the Committee on the Ethics of Animal Experiments of Jiangsu University (Zhenjiang, China).
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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