Open Access

Ginger facilitates cell migration and heat tolerance in mouse fibroblast cells

  • Authors:
    • Naotoshi Sugimoto
    • Masanori Katakura
    • Kentaro Matsuzaki
    • Mayumi Miyamoto
    • Eri Sumiyoshi
    • Taizo Wada
    • Akihiro Yachie
    • Hiroyuki Nakamura
    • Osamu Shido
  • View Affiliations

  • Published online on: February 2, 2021     https://doi.org/10.3892/mmr.2021.11889
  • Article Number: 250
  • Copyright: © Sugimoto et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The components of ginger root (Zingiber officinale Roscoe) are widely used for various medicinal purposes. Several bioactive compounds have been identified in ginger, including 6‑, 8‑ and 10‑gingerols, and 6‑shogaol, which are agonists of the thermo‑sensors transient receptor potential (TRP) cation channel subfamily V member 1 and TRP ankyrin 1. Our previous study demonstrated that ginger powder may affect human metabolism in vivo. However, the effects of the bioactive compounds of ginger on cells have not been completely elucidated. The present study investigated whether ginger powder extracts could modify cell functions in mouse fibroblast cells. The active components of ginger powder extracts were characterized using high‑performance liquid chromatography. The activation of protein kinases, actin assembly, cell migration, expression levels of heat shock proteins (HSPs) and cell viability after heat shock were analyzed in NIH3T3 mouse fibroblast cells. Subsequently, 6‑, 8‑, 10‑ and 12‑gingerols, as well as 6‑, 8‑ and 10‑shogaols, were detected in ginger powder extracts. The levels of phosphorylated Akt, mTOR, ERK and p38 MAPK increased after a 10‑min stimulation with ginger powder extracts. In addition, HSP expression levels, lamellipodia formation occurring at cell edges, cell migration and tolerance against heat shock were facilitated following ginger powder extract stimulation. These results suggest that ginger modified cell functions, including actin assembly and heat tolerance, in vitro.

Introduction

The components of ginger root (Zingiber officinale Roscoe, Zingiberaceae) are widely used for various medicinal purposes all over the world (1). One of the well-known effects of ginger is relief of gastrointestinal symptoms, including hyperemesis gravidarum and nausea (2). Several bioactive compounds - that is, 6-, 8- and 10-gingerols, and 6-shogaol - have been identified in ginger (3,4). These bioactive compounds function as antagonists of cholinergic and serotonergic receptors (5) and, in turn, might induce prevention of hyperemesis gravidarum and nausea (2). Meanwhile, one of the generally acknowledged beneficial effects of ginger consumption is an induction of a ‘warm sensation.’ Recently, we demonstrated that ginger powder might affect human metabolism in vivo (6). Interestingly, 6-, 8- and 10-gingerols, and 6-shogaol act as regulators of transient receptor potential (TRP) cationic channels, including TRP cation channel subfamily V member 1 (TRPV1), TRP canonical 5 (TRPC5), and TRP ankyrin 1 (TRPA1) (79).

TRP cationic channels are nonselective channels and are activated by chemicals and temperature (heat) (10,11). In particular, TRPV1 functions as a sensor for heat >42°C and a capsaicin receptor causing a burning sensation under stimulation of capsaicin that is the ‘hot’ ingredient in chili peppers. Recently, we showed that moderate heat (39.5°C) or capsaicin activates protein kinases, upregulates the expression of heat shock proteins (HSPs), and induces morphological changes in mouse fibroblast cells (1215). If the components of ginger affect cells in a similar manner as heat or capsaicin by activating TRPV1, it is postulated that these components can regulate protein kinases, HSP expression, and cell morphology. However, the effects of such components on cells have not been fully elucidated.

In this study, to determine whether ginger powder extracts (GPE) modify cell functions, we conducted various in vitro experiments in NIH3T3 mouse fibroblast cells. We investigated the effects of GPE on cellular responses; for instance, activation of Akt-mammalian target of rapamycin (mTOR) signaling and mitogen-activated protein kinases (MAPKs), cell morphology and migration, levels of HSPs, and heat tolerance - in mouse fibroblast cells.

Materials and methods

Chemicals

Dried ginger powder was provided by Sunsho Pharmaceutical Co., Ltd. Dulbecco's modified Eagle's medium (DMEM) was obtained from Wako Pure Chemical Industries, Ltd., whereas fetal bovine serum (FBS) was obtained from Invitrogen; Thermo Fisher Scientific, Inc.. Anti-phospho-mTOR (Ser2448) rabbit antibody (#2971), anti-mTOR rabbit antibody (#2983), anti-phospho-Akt (Ser473) rabbit antibody (#9271), anti-Akt rabbit antibody (#9272), anti-phospho-specific p38 mitogen-activated protein kinase (p38 MAPK) (Thr180/Tyr182) rabbit antibody (#9211), anti-p38 MAPK rabbit antibody (#9212), anti-phospho-specific extracellular signal-regulated kinase (ERK1/2) (Thr202/Tyr204) (20G11) rabbit antibody (#4376), anti-ERK1/2 rabbit antibody (#9102), anti-heat shock factor 1 (HSF1) rabbit antibody (#4356), anti-HSP90 (E289) rabbit antibody (#4875), anti-HSP70 rabbit antibody (#4872), anti-HSP40 rabbit antibody (#4868), anti-glyceraldehyde-3-phosphate dehydrogenase (GAPDH) rabbit antibody (#2118), and horseradish peroxidase (HRP)-conjugated anti-rabbit IgG (#7074) were purchased from Cell Signaling Technology, Inc.. Meanwhile, EzWestBlue was purchased from ATTO Corp..

Preparation and characterization of GPE

GPE was extracted from dried ginger powder (Sunsho Pharmaceutical Co., Ltd. Shizuoka, Japan) with 95% ethanol and dry down with N2 gas. Then, residues were dissolved in dimethyl sulfoxide (DMSO). The active components of GPE used in this study were characterized using high-performance liquid chromatography (HPLC). The active components of GPE were measured as described by Yu et al (4) and Tao et al (3) with a slight modification. Briefly, HPLC was combined with electrospray ionization/tandem mass spectrometry (LC-ESI-MS/MS) in a TSQ Quantum mass spectrometer (Thermo Fisher Scientific, Inc.). HPLC was conducted in a Luna 3u C18 (2) 100 Å LC column (100×2.0 mm; Phenomenex) at 30°C. Samples were eluted with a mobile phase composed of acetonitrile-methanol (4:1,v/v) and water-acetic acid (100:0.1, v/v) in a 20:80 ratio for 5 min, then ramped up to a 100:0 ratio after 10 min, and held for 5 min at a flow rate of 0.2 ml/min. MS/MS analyses were conducted in positive ion mode, and 6-, 8-, 10- and 12-gingerols and 6-, 8- and 10-shogaols were detected and quantified with selected reaction monitoring. Peaks were selected, and their areas were calculated using Xcalibur 2.1 software (TThermo Fisher Scientific, Inc.). The main active components in GPE are summarized in Table I.

Table I.

Main bioactive components in ginger powder extracts (100 µg) used in the present study.

Table I.

Main bioactive components in ginger powder extracts (100 µg) used in the present study.

Bioactive componentsWeight, µg
6-Gingerol23.68
8-Gingerol3.80
10-Gingerol5.22
12-Gingerol0.15
6-Shogaol51.38
8-Shogaol7.18
10-Shogaol4.58

For treatment of cells, GPE stock solutions dissolved in DMSO at the concentrations of 0.001, 0.01, 0.1, and 1.0 mg/ml were prepared and stored at −20°C until use. The respective GPE stock solutions were diluted 1:1,000 (v/v) in the cell culture medium. Resultantly, the final concentration of GPE in culture medium used in each experiment was 0.001, 0.01, 0.1, and 1.0 mg/ml, respectively.

Cell culture

NIH3T3 mouse fibroblast cells were provided by Dr Nobuhiko Komine (Kanazawa University). The cells were maintained in DMEM containing 10% FBS at 37°C in a 5% CO2 incubator.

Western blotting

Western blotting was performed as described previously (16). Briefly, proteins were extracted from cells, and protein concentrations were determined using Pierce BCA protein assay kit (Thermo Fisher Scientific, Inc.) according to the manufactures protocol. Equal amounts of protein (30 µg) were separated from each sample using 10% sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The resolved proteins were transferred onto polyvinylidene fluoride (PVDF) membranes, which were incubated with primary antibodies (1:1,000), followed by incubation with HRP-linked secondary antibodies (1:2,000).

Actin filament staining

To evaluate the actin cytoskeletons, cells were fixed in 3.7% (v/v) formaldehyde in Dulbecco's phosphate-buffered saline (PBS) and processed as described previously (17). F-actin was visualized with tetramethylrhodamine (TRITC)-labeled phalloidin under an inverted EVOS fluorescence microscope (Life Technologies Japan).

Cell viability assay

Cell viability was analyzed using the Cell Counting Kit-8 (Wako Pure Chemical Industries, Ltd.) as described previously (16). NIH3T3 cells were seeded in 96-well plates at a density of 1×103 cells/well. After 24 h of incubation, the cells were treated with 0.001–1.0 µg/ml of GPE for 2 days. Next, the cells were incubated with 10 µl CCK-8 for 3 h at 37°C. The absorbance of the colored formazan product produced by mitochondrial dehydrogenases in metabolically active cells was recorded at 450 nm. Cell viability was expressed as a ratio of the absorbance obtained in treated wells relative to that in untreated (control: 0.1% DMSO) wells.

Wound healing assay (cell migration)

A wound healing assay was performed to evaluate the migration ability of the cells. Cells were passaged into 35-mm dishes. When the cells reached to the 90% confluence, an injury line of 2 mm width was drawn using a pipet tip. The dishes were rinsed with PBS and incubated with DMEM. The images were obtained after 16 h of incubation and the wound closure was measured.

Severe heat shock treatment

The cells were exposed to 45°C temperature for 30 min after a 2-day treatment with or without GPE at 37°C in 5% CO2. One day after the heat shock treatment, cell viability was analyzed using the Cell Counting Kit-8 as described above.

Statistical analysis

Data are presented as the mean ± standard error of the mean (SEM) from at least three independent experiments. Statistical analysis was performed using a Student's unpaired t-test or a Kruskal-Wallis nonparametric analysis of variance (ANOVA) with Dunn's post hoc test, and results were considered statistically significant when P<0.05 or P<0.01.

Results

Low doses of GPE do not affect cell viability in mouse fibroblast cells

Several previous reports have shown that the ingredients of GPE, gingerol and shogaol have toxic effects on the cells (1820). However, in this study, we found that low doses of GPE (0.001–0.1 µg/ml) had a minimal effect on cell viability. As shown in Fig. 1, the low doses (0.001–0.1 µg/ml) of GPE did not significantly decrease the cell viability. Therefore, we used 0.001–0.1 µg/ml doses of GPE for the subsequent experiments.

GPE activate Akt/mTOR signaling

To determine whether GPE activates Akt/mTOR signaling pathway, we detected phosphorylated Akt (phospho-Akt) and phosphorylated mTOR (phospho-mTOR) by western blot. Western blot analysis revealed that the GPE increased phospho-Akt and phospho-mTOR levels in NIH3T3 cells (Fig. 2). These results indicate that the GPE activates Akt/mTOR signaling pathway. These result indicate that the activation of Akt-mTOR signaling and increase in intracellular phosphatidylinositol 3-phosphate (PtdIns3P or PI3P). PI3P stimulates Rho family small G proteins (Rho, Rac, and Cdc42) as well as Akt (17,21), and, in turn, regulates cell morphology and cell migration.

GPE regulate cell morphology and stimulate cell migration

Microscopic examination indicated that GPE changed cell morphology and promoted cell migration (Fig. 3). We observed that lamellipodia formation occurred at the cell edges (Fig. 3, upper), which is known to facilitate cell migration (22). In fact, a 16-h treatment with GPE narrowed the wound area in vitro (Fig. 3, lower), indicating acceleration of cell migration.

GPE activate ERK and p38 MAPK in mouse fibroblast cells

MAPKs, including ERK and p38 MAPK, play crucial roles in the transduction from extracellular stimuli to intracellular signaling (15,22). Next, we tested the effects of GPE on ERK and p38 MAPK in the cells. A 10-min treatment with GPE increased the phosphorylation of ERK and p38 MAPK in a dose-dependent manner (Fig. 4), indicating that the GPE activates ERK and p38 MAPK.

GPE induces HSF1, HSP90, HSP70 and HSP40 expression

Continuous exposure to heat induces the upregulation of HSPs in vitro (23,24). Previously, we had also shown that continuous 2-day exposure to moderate heat increased HSP70 and HSP90 expressions (12). We therefore speculated whether GPE upregulates HSPs expressions in mouse fibroblast cells. Interestingly, the expression of HSF1, HSP90, HSP70, and HSP40 was increased after a 2-day continuous treatment with GPE in NIH3T3 cells (Fig. 5). These results indicated that ginger might induce upregulation of HSPs similar to the effect of heat exposure.

GPE attenuates severe heat shock-induced cell death

HSPs play an important role in protecting cells from environmental stressors such as heat shock (14,15,23,24). Thus, we examined whether a continuous 2-day treatment with GPE can improve heat tolerance by measuring cell viability after severe heat shock in mouse fibroblast cells. The cells were incubated at 45°C for 30 min (severe heat shock) after an initial 2-day treatment with GPE at 37°C. Cell viability was determined after 1 day of severe heat shock.

Results showed that although severe heat shock decreased cell viability, GPE treatment was able to attenuate heat shock-induced cell death in mouse fibroblast cells (Fig. 6). This result suggested that GPE may facilitate heat tolerance in vitro.

Discussion

Several bioactive compounds-6-, 8-, 10-, and 12-gingerols and 6-, 8- and 10-shogaols-were identified in GPE (Table I). However, the effects of these bioactive compounds on cells have not been fully elucidated in vitro. The results of our investigation provide evidence that GPE activated phosphoinositide 3-kinase (PI3K)-Akt-mTOR and MAPKs, facilitated cell migration and expression levels of HSPs, and attenuated heat shock-induced cell death in mouse fibroblast cells.

Treatment with GPE (~0.1 µg/ml) did not affect cell viability, indicating that GPE (~0.1 µg/ml) is nontoxic to mouse fibroblast cells, in contrast to several reports showing that the ingredients of ginger extracts, such as gingerol and shogaol, have cytotoxic activity (1820). The discrepancy in the findings regarding the cytotoxic activity of ginger might be attributable to the difference in the doses of GPE used. In our study, the dose used was ~0.1 µg/ml, whereas Akimoto et al (18) used ~25 µg/ml. Interestingly, the total levels of free 6-, 8- and 10-gingerols and 6-shogaol in serum 60 min after the oral intake of GPE in humans were <0.1 µg/ml (25). Therefore, the physiological response to lower doses of ginger constituents-rather than higher doses-is likely to be of greater importance. The doses of GPE (0.01–0.1 µg/ml) used in our study were appropriate for elucidating the effect of ginger on cells.

Actin assembly and cell migration are regulated by the activity of a number of signaling molecules (15,22). Lamellipodia are formed by actin assembly at the edge of a cell in the direction of migration. PI3K activation is known to phosphorylate Akt (Akt activation) and induce lamellipodia formation (15,22). After Akt activation by PI3K, Akt phosphorylates mTOR (15,22,26). Here, we have shown that GPE phosphorylate Akt and mTOR in mouse fibroblast cells, indicating that they activate the PI3K-Akt-mTOR pathway. Moreover, GPE facilitate lamellipodia formation occurring at cell edges and narrow wound areas, indicating acceleration of cell migration. These results suggested that ginger might play a valuable role in wound healing, erosion, or ulcer. In fact, a recent study showed that the Japanese herbal medicine Hangeshashinto, which contains ginger, enhances oral keratinocyte migration to facilitate healing of oral ulcerative mucositis (6). The components contained in ginger may regulate actin assembly and cell migration via the Akt-mTOR pathway. However, there are many other signal cascades that control cytoskeletal polymerization and cell migration other than Akt-mTOR pathway, e.g., Rho-A/Rho-kinase signaling pathway (27,28). The impact of GPE on actin assembly- and cell migration-related signal cascades other than Akt-mTOR pathway should be investigated in the future.

In general, the activation of Akt pathway is related not only to migration but also to proliferation of various types of cells, such as mononuclear macrophages and epithelial cells (29,30). Also, we have previously shown that direct exposure to mild heat increases neural stem/progenitor cells (NSC/NPCs) proliferation concomitant with the upregulation of Akt phosphorylation (31). Since GPE may affect various types of cell proliferation via activation of Akt pathway, the effects of GPE on cell proliferation e.g., mononuclear macrophages, epithelial cells and NSC/NPCs, should be investigated as a continuation of this study.

GPE activated ERK and p38 MAPK. ERK signaling is a crucial regulator of growth, differentiation, and migration (32), whereas p38 MAPK is generally known as the principal stress-activated protein kinase, and the p38 MAPK pathway regulates HSP transcription (33) through the activation of HSF-1 (34). In this study, GPE increased the levels of HSF-1, and HSPs (HSP90, HSP70, and HSP40), concomitant with activation of p38 MAPK.

HSPs play an essential chaperoning role that helps cells maintain cellular protein homeostasis and prevent apoptosis under diverse forms of stress (24,3537). Previously, the upregulation of HSP70 and HSP90 has been shown to cause the development of heat tolerance in mouse fibroblast cells (12,14,15). In this study, GPE attenuated heat shock-induced cell death. These data indicate that ginger may facilitate heat tolerance similar to the effect of heat exposure.

However, our data did not show which receptor mediated ginger-induced cell functions. The bioactive compounds in ginger have been reported to function as antagonists of cholinergic and serotonergic receptors (5) or activators of TRPV1, TRPVC5, and TRPA1 (79). Interestingly, TRPV1 and TRPA1 act as thermo-sensors. In this study, we showed that GPE upregulate HSP levels in a similar manner to heat in mouse fibroblast cells. These lines of evidence indicate that ginger might moderate cell functions through TRPs, including TRPV1 and TRPA1 (Fig. 7).

In this study, we showed that GPE accelerate cell migration and prevent heat shock-induced cell death in vitro. These results suggest that ginger might play a valuable role in wound and ulcer healing, preventing erosion, as well as resisting heat shock.

Acknowledgements

Not applicable.

Funding

This study was supported by Grants-in-Aid for Science and Culture (grant nos. 25282021, 26650173, 15KT0003, 16K13013 and 17H01963) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.

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

NS designed the study and prepared the manuscript. NS, MK, KM and ES conducted the experiments. MM, TW and HN analyzed the data. NS, MK and KM assessed the authenticity of the data. NS obtained funding. AY and OS contributed to interpretation of data and supervised the study. NS, MK, KM, AY and OS revised the manuscript. All 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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Sugimoto N, Katakura M, Matsuzaki K, Miyamoto M, Sumiyoshi E, Wada T, Yachie A, Nakamura H and Shido O: Ginger facilitates cell migration and heat tolerance in mouse fibroblast cells. Mol Med Rep 23: 250, 2021.
APA
Sugimoto, N., Katakura, M., Matsuzaki, K., Miyamoto, M., Sumiyoshi, E., Wada, T. ... Shido, O. (2021). Ginger facilitates cell migration and heat tolerance in mouse fibroblast cells. Molecular Medicine Reports, 23, 250. https://doi.org/10.3892/mmr.2021.11889
MLA
Sugimoto, N., Katakura, M., Matsuzaki, K., Miyamoto, M., Sumiyoshi, E., Wada, T., Yachie, A., Nakamura, H., Shido, O."Ginger facilitates cell migration and heat tolerance in mouse fibroblast cells". Molecular Medicine Reports 23.4 (2021): 250.
Chicago
Sugimoto, N., Katakura, M., Matsuzaki, K., Miyamoto, M., Sumiyoshi, E., Wada, T., Yachie, A., Nakamura, H., Shido, O."Ginger facilitates cell migration and heat tolerance in mouse fibroblast cells". Molecular Medicine Reports 23, no. 4 (2021): 250. https://doi.org/10.3892/mmr.2021.11889