Open Access

Resveratrol protects against sodium nitroprusside induced nucleus pulposus cell apoptosis by scavenging ROS

  • Authors:
    • Kang Li
    • Yan Li
    • Jie Mi
    • Lu Mao
    • Xiuguo Han
    • Jie Zhao
  • View Affiliations

  • Published online on: February 6, 2018     https://doi.org/10.3892/ijmm.2018.3461
  • Pages: 2485-2492
  • Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Oxidative stress induced disc cell apoptosis plays an important role in intervertebral disc (IVD) degeneration. The present study aims to investigate effects of resveratrol (RV), a natural polyphenol compound, on sodium nitroprusside (SNP) induced nucleus pulposus (NP) cell apoptosis and related mechanism. Rat NP cells were pretreated with RV, N-acetyl cysteine (NAC) and carboxy-PTIO (PTIO) before SNP treatment. Cell Counting Kit-8 assay was carried out for cell viability evaluation. Annexin V/propidium iodide (PI), Hoechst 33258 and Actin‑Tracker Green and Tubulin-Tracker Red staining were conducted to detect NP cell apoptosis and apoptotic structural changes. Mitochondrial membrane potential (ΔΨm) was analyzed with tetramethylrhodamine methyl ester staining. DCFH-DA and DAF-FM DA staining was used to determine intracellular reactive oxygen species (ROS) and nitric oxide (NO) levels. An ex vivo experiment was also carried out followed by TUNEL assay of sections of discs. SNP induced NP cell apoptosis, excessive production of intracellular ROS and NO, reduction of ΔΨm as well as disruption of cytoskeletal and morphological structure. Meanwhile, organ culture results showed that SNP induced NP cell apoptosis ex vivo. RV and NAC siginificantly inhibited SNP induced NP cell apoptosis, production of intracellular ROS, deline of ΔΨm as well as disruption of cytoskeletal and morphological structure, while RV did not suppress NO production. RV and NAC could also suppress SNP induced NP cell apoptosis ex vivo. However, PTIO did not prevent SNP induced NP cell apoptosis, though it scavenged NO significantly. In conclusion, RV protects against SNP induced NP cell apoptosis by scavenging ROS but not NO, suggesting a promising prospect of RV in IVD degeneration retardation.

Introduction

Low back pain (LBP), a serious social health problem in modern society, has imposed a huge burden on the health care system (1,2). Related studies have proved intervertebral disc (IVD) degeneration to play the most important role in pathology of LBP and other spine degenerative diseases (3,4). Nowadays, however, the IVD degeneration mechanism has not be completely elucidated. There is evidence that nucleus pulposus (NP) cell apoptosis, which is triggered by biomechanical and biochemical stimulus in degenerative progression (5,6), plays an important role in IVD degeneration (7,8).

Previous studies demonstrate that excessive reactive oxygen species (ROS) may impair the mitochondrial function, resulting in apoptosis (9). In IVD, ROS can be produced by NP cells in response to many kinds of biomechanical and biochemical stimulus, such as compression loading, high glucose and hydrogen peroxide (1013). Meanwhile, nitric oxide (NO) is also proved to induce IVD cell apoptosis during degeneration (14). NO can suppress activity of cytochrome oxidase, leading to the reduction of the electron transport chain and the production of superoxide anions (15). NO production of NP cells may be induced by stimulation of interleukin (IL)-1, -10 and interferon (INF)-γ, which are involved in IVD degeneration (16,17). Sodium nitroprusside (SNP), a widely used donor of NO, is often adopted to investigate the mechanism of chondrocyte apoptosis induced by NO (1821). Treatment of SNP can also cause mitochondrial dysfunction in chondrocyte, which is characterized by decline of mitochondrial membrane potential (ΔΨm) and release of cytochrome c (2123). Similarly, as to IVD, SNP has been also used as an apoptosis inducer in annulus fibrosus cells, which are chondrocyte-like, suggesting that SNP can induce both endoplasmic reticulum and mitochondrial stress in annulus fibrosus cells (24).

Resveratrol (RV; 3,5,4′-trihydroxy-trans-stilbene), a natural polyphenol compound which could be extracted from grapes, has previously been proved to possess anti-inflammatory, antioxidant, and anticancer bioactivities in different kinds of cells and tissues (2529). RV can protect IVD from degeneration by reducing levels of proinflammatory cytokines and activating silent mating type information regulator 2 homolog 1 (SIRT1) (3034). However, antioxidant properties of RV in IVD have not been elucidated yet.

The present study aimed to explore the effects of RV on SNP induced NP cell apoptosis and investigate related mechanism. For the first time, our results indicate that RV can protect NP cells from SNP induced apoptosis, through scavenging excessive ROS rather than NO provided by SNP.

Materials and methods

Materials and reagents

SNP, RV, dimethyl sulfoxide (DMSO), N-acetyl cysteine (NAC), carboxy-PTIO (PTIO), type II collagenase, L-ascorbic acid, Hoechst 33258, 4′,6-diamidino-2-phenylindole (DAPI) and insulin-transferrin-selenium were purchased from Sigma-Aldrich (St. Louis, MO, USA). Dulbecco's modified Eagle's medium/nutrient mixture F-12 (DMEM/F12), trypsin, penicillin/streptomycin and fetal bovine serum (FBS) was purchased from Gibco (Carlsbad, CA, USA). Cell Counting Kit-8 (CCK-8) was purchased from Dojindo (Kumamoto, Japan). Caspase-3, -8, and -9 activity assay kits, 2′,7′-dichlorofluorescin diacetate (DCFH-DA), 3-amino,4-aminomethyl-2′,7′-difluorescein, diacetate (DAF-FM DA), Actin-Tracker Green and Tubulin-Trakcer Red were from purchased from Beyotime Institute of Biotechnology (Jiangsu, China). Annexin V-FITC/propidium iodide (PI) apoptosis detection kit and tetramethylrhodamine methyl ester (TMRM) was purchased from Invitrogen Life Technologies (Carlsbad, CA, USA). In situ cell death detection kit was purchased from Roche Diagnostics (Basel, Switzerland).

SNP was dissolved with phosphate-buffered saline (PBS) and NAC was dissolved with ultrapure water just before experiment. RV and PTIO were dissolved with DMSO. It is ensured that the working concentration of DMSO in medium was <1% throughout all experiments. The treatment time and concentration of RV and SNP were determined by our experiments. The pretreatment time of PTIO and NAC is 4 h, while their concentration is respectively 100 μM and 2 mM.

NP cell isolation and culture

This present study was carried out in accordance with the recommendations in the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health. Our experiment protocol was approved by the Animal Care and Experiment Committee of Shanghai Jiao Tong University School of Medicine. Ten 3-month-old Sprague-Dawley rats were provided by Experimental Animal Center of Shanghai Ninth People's Hospital for in vitro experiments. NP cell isolation and culture were carried out as we previously described (35). The second-generation NP cells were adopted in the following experiments. NP cells were seeded into 96-well plates (5×103/well for cell viability assay) or 6-well plates (1×105/well for apoptosis assay, caspases activity assay, intracellular ROS and NO measurement and mitochondrial membrane potential assay) for at least 24 h before treatment of any reagent.

Cell viability, apoptosis and caspase activity assay

According to manufacturer's instructions, cell viability was measured with CCK-8 (Dojindo) using a microplate reader (Omega Bio-Tek, Inc., Norcross, GA, USA). All cell viability experiments were performed 6 times. Flow cytometry (FCM) was carried out for analysis of apoptosis rates with Annexin V-FITC/PI apoptosis detection kit following instructions, while 10,000 NP cells were collected for each FCM analysis. Apoptosis rates were calculated as Q2 (Annexin V-FITC-positive and PI-positive) + Q3 (Annexin V-FITC-positive and PI-negative). NP cells were stained with 0.5 μg/ml Hoechst 33258 for 20 min in dark and then imaged by a fluorescent microscope (IX71; Olmypus, Tokyo, Japan). Caspase-3, -8 and -9 activities were detected with caspase-3, -8, and -9 activity assay kits following manufacturer's instructions using a microplate reader (Omega Bio-Tek, Inc.). The caspase activity levels were expressed as relative activity with control as standard.

Mitochondrial membrane potential assay

Mitochondrial membrane potential was measured with TMRM staining. NP cells were incubated with 100 nM TMRM at 37°C in dark for 30 min, washed with PBS 3 times and covered with fresh medium. NP cells were subsequently imaged using microscope (IX71, Olmypus). The excitation wavelength for TMRM was 549 nm. Three images (×200) of each kind of treatment were obtained for quantitative analysis of fluorescence intensity of the TMRM using IPP version 6.0 software (Media Cybernetics, Bethesda, MD, USA). The fluorescence intensity of the TMRM was expressed as mean density in IPP version 6.0 software.

Measurement of intracellular ROS and NO

To measure intracellular ROS or NO level, NP cells was incubated with DCFH-DA (10 μM) for 30 min or with DAF-FM DA (5 μM) for 20 min in dark at 37°C. After washed with PBS 3 times, NP cells were collected and suspended in fresh medium. The fluorescence intensity was detected using a microplate reader (Omega Bio-Tek, Inc.). The excitation wavelengths for DCFH-DA and DAF-FM DA are 488 and 495 nm respectively. The experiments were repeated 3 times.

Imaging of cytoskeletal and morphological structure

Imaging of cytoskeletal structure was carried out as previously described (29). After staining with Actin-Tracker Green and Tubulin-Trakcer Red, cytoskeletons (×400) were imaged using a fluorescent microscope (LEICA DM4000B; Leica Microsystems GmbH, Wetzlar, Germany). The excitation wavelengths for Actin-Tracker Green and Tubulin-Trakcer Red are 488 and 543 nm respectively. After cell treatment, NP cells (×200) were imaged under transmitted light illumination using microscope (IX71; Olmypus).

Organ culture and TUNEL assay

Rat disc organ culture was carried out as we previously described (35). Ex vivo, discs were pretreated with 100 μM RV for 24 h or 2 mM NAC for 12 h or 100 μM PTIO for 12 h, then treated with or without 1 mM SNP for 18 h. Then the harvested discs were fixed in 4% paraformaldehyde, and then decalcified with EDTA for 2 weeks. After embedding with paraffin, 5-μm thick serial mid-sagittal sections of discs were made for slides. Mid-sagittal sections of discs were analyzed for apoptosis using in situ cell death detection kit according to manufacturer's instructions. DAPI staining was conducted for indication of total cells. TUNEL-positive apoptotic cells and DAPI-positive total cells of NP area on mid-sagittal sections of discs were identified by fluorescent microscope (IX71; Olmypus), and apoptosis rate was calculated as the percentage of numbers of TUNEL-positive cells to the numbers of total cells using IPP version 6.0 software (Media Cybernetics). The quantitative analysis was performed on three ×200 fields/section (three sections/disc and three discs for each kinds of treatment).

Statistical analysis

All statistical data were expressed as mean ± standard deviation. Results were statistically analyzed by a one-way analysis of variance (ANOVA) with multiple comparisons using SPSS 19.0 (IBM, Inc., New York, NY, USA). P-values <0.05 were considered to indicate statistically significant difference.

Results

Dose and time-dependent effects of SNP and RV on NP cell viability

As shown by CCK-8 assays, SNP induced NP cells cytotoxicity in a dose and time-dependent manner (Fig. 1A and B). Treatment concentration of SNP was set as 1 mM and treatment time of SNP was set as 6 h throughout the following experiments without indication. Treatment of RV for 24 h did not exert obvious cytotoxicity on NP cells when RV concentration was no higher than 200 μM (Fig. 1C). Treatment of 100 μM RV did not exert significant cytotoxicity on NP cells when treatment time was no longer than 24 h (Fig. 1D). Pretreatment of RV for 18 h showed dose-dependent protective effects on SNP induced cytotoxicity (Fig. 1E). Pretreatment of 100 μM RV protected NP cells from SNP induced cytotoxicity in a time-dependent manner (Fig. 1F). Treatment concentration of RV was set as 100 μM and treatment time of RV was set as 18 h throughout the following experiments without indication.

RV protects against SNP induced NP cell apoptosis by scavenging ROS instead of NO in vitro

In order to investigate the mechanism of protective effects of RV, NAC as an established ROS scanvenger and PTIO as an established NO scanvenger were adopted in the following experiments. FCM assay with Annexin V-FITC/PI staining showed that SNP induced significant NP cell apoptosis, which was significantly rescued by RV and NAC instead of PTIO (Fig. 2A and B). CCK-8 assays demonstrated that RV and NAC instead of PTIO significantly suppressed SNP induced cytotoxicity, while NAC or PTIO alone did not show obvious cytotoxicity (Fig. 2C). Meanwhile, RV and NAC instead of PTIO markedly inhibited activation of caspase-3 and -9 induced by SNP (Fig. 2D). However, SNP did not significantly activate caspase-8 (Fig. 2D). Hoechst 33258 staining images showed that RV and NAC instead of PTIO effectively decreased apoptotic nuclei containing condensed or fragmented chromatin induced by SNP, which is consistent with FCM assay with Annexin V-FITC/PI staining (Fig. 2E). As to mitochondrial membrane potential, TMRM staining and quantitative analysis demonstrated that significant loss of ΔΨm was caused by SNP and effectively rescued by RV and NAC but not PTIO (Fig. 3A and B). As shown by intracellular ROS and NO analysis, SNP significantly induced production of intracellular ROS (Fig. 3C) and NO (Fig. 3D). Pretreatment with RV obviously suppressed SNP induced excessive intracellular ROS production, but did not suppress SNP induced NO production (Fig. 3C and D). As expected, NAC significantly decreased the SNP induced high intracellular ROS and NO production, while PTIO significantly decreased the SNP induced high intracellular NO production but not ROS production.

Overall, ROS, not NO, production is probably the key mechanism of SNP induced NP cell apoptosis. RV can effectively scavenge intracellular ROS instead of NO, subsequently protecting NP cells from SNP induced apoptosis.

RV protects NP cells from SNP induced disruption of cytoskeletal and morphological structure

Actin-Tracker Green and Tubulin-Trakcer Red were used to mark F-actin and α-tubulin respectively under fluorescent microscope. In control and RV treated NP cells, normal cytoskeleton was observed with regularly distributed F-actin filament and microtubule (Fig. 4A). SNP treatment caused cytoskeleton shrinkage, by curling up F-actin filaments and disrupting microtubule structure (Fig. 4A). The SNP induced cytoskeleton shrinkage was significantly rescued by RV and NAC instead of PTIO (Fig. 4A). Under microscope with transmitted light illumination, SNP induced obvious cell shrinkage compared to control, which was significantly prevented by RV and NAC but not PTIO (Fig. 4B).

RV protects against SNP induced NP cell apoptosis by scavenging ROS instead of NO ex vivo

Organ culture was also carried out to analyze effects of RV on NP cells ex vivo. Treatment of SNP ex vivo significantly increased the TUNEL-positive cells percentage of NP area on mid-sagittal sections of discs compared to control (Fig. 5A and B). Consistent with in vitro results, RV and NAC significantly decreased TUNEL-positive cells percentage on mid-sagittal sections of discs compared to SNP treated group, while PTIO exerted no significant effects (Fig. 5A and B).

Discussion

Our results demonstrate that SNP can potently induce NP cell apoptosis in a ROS dependent rather than NO dependent manner. For the first time, RV is found to effectively scavenge ROS instead of NO in NP cells, through which RV significantly inhibits SNP induced NP cell apoptosis.

In previous cartilaginous studies, SNP is usually adopted as a NO donor to investigate NO related apoptosis and NO is considered to be the key mediator of apoptosis (18,36,37). As to IVD, Zhao et al proved that both endoplasmic reticulum and mitochondria play a role in SNP induced annulus fibrosus cell apoptosis and speculated that high concentration of NO provided by SNP acted as the main upstream mediator (24). However, no study focused on effects of SNP on NP cells. Moreover, a recent study show that ROS rather than NO plays the key role in SNP induced in rabbit articular chondrocytes apoptosis, suggesting a new mechanism of SNP induced apoptosis (29). In our study, both intracellular NO and ROS level was raised by SNP treatment. Nevertheless, PTIO, which significantly scavenged intracellular NO, could not retard SNP induced NP cell cytotoxicity and apoptosis, which indicated that SNP induces NP cell apoptosis in a NO independent manner.

It has been reported that SNP can hinder electron transfer process and raise the level of reduced cytochrome c, resulting in production of ROS (38). Meanwhile, mitochondrial membrane potential can be reduced by SNP in many kinds of tissues (3942). Loss of mitochondrial membrane potential means disruption of mitochondrial membrane function, which leads to the transfer of ROS into cytoplasm subsequently inducing cell death (43). As shown by our results, SNP induced an excessive production of ROS, loss of mitochondrial membrane potential and apoptosis. According to our results, we conclude that ROS instead of NO is the key mediator of SNP induced NP cell apoptosis. Interestingly, SNP seemed to exert no obvious effects on caspase-8 activity when it significantly activated caspase-3 and -9. It is probably due to that SNP induces NP cell apoptosis mainly via an intrinsic apoptotic pathway (44). In the present study, RV showed potent effects of scavenging ROS to inhibit SNP induced apoptosis, which is comparable to NAC. However, no obvious effects of RV were observed on SNP induced NO production unlike NAC and PTIO.

To further prove the effects of RV, an ex vivo study was also carried out. Among studies adopting disc organ culture system, few of them focus on NP cells apoptosis induced by oxidative stress (4547). Considering the rapid effects of SNP in vitro, we modified the organ culture system with relatively short culture time. For the first time, it is found that ex vivo SNP treatment on IVD caused significant NP cell apoptosis under the established disc organ culture condition. Consistent with in vitro results, RV and NAC but not PTIO partly recued the NP cell apoptosis ex vivo.

RV has been reported to exert antioxidative effects in many kinds of tissues, while the antioxidative potential of RV in NP cells is proved by us for the first time (4850). As oxidative stress plays an important role in degeneration related disc cell apoptosis, antioxidative treatment is a promising therapeutic strategy (1013). There have been studies aiming to retard IVD degeneration with antioxidative drugs and biomaterials (13,51,52). The antioxidative potential makes RV a good choice for treatment of IVD degeneration in future targeting at degeneration related disc cell apoptosis.

In general, the present study demonstrated that ROS is the key mediator in SNP induced NP cell apoptosis. RV significantly inhibit SNP induced NP cell apoptosis by scavenging ROS but not NO in vitro and ex vivo. With potent antioxidative activity, RV would be a favorable candidate for protection against oxidative stress related disc cell apoptosis.

Acknowledgments

The technical support from Chuan Jiang and Lei Wang is appreciated by the authors.

Notes

[1] Competing interests

The authors declare that they have no competing interests.

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May-2018
Volume 41 Issue 5

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Copy and paste a formatted citation
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Spandidos Publications style
Li K, Li Y, Mi J, Mao L, Han X and Zhao J: Resveratrol protects against sodium nitroprusside induced nucleus pulposus cell apoptosis by scavenging ROS. Int J Mol Med 41: 2485-2492, 2018
APA
Li, K., Li, Y., Mi, J., Mao, L., Han, X., & Zhao, J. (2018). Resveratrol protects against sodium nitroprusside induced nucleus pulposus cell apoptosis by scavenging ROS. International Journal of Molecular Medicine, 41, 2485-2492. https://doi.org/10.3892/ijmm.2018.3461
MLA
Li, K., Li, Y., Mi, J., Mao, L., Han, X., Zhao, J."Resveratrol protects against sodium nitroprusside induced nucleus pulposus cell apoptosis by scavenging ROS". International Journal of Molecular Medicine 41.5 (2018): 2485-2492.
Chicago
Li, K., Li, Y., Mi, J., Mao, L., Han, X., Zhao, J."Resveratrol protects against sodium nitroprusside induced nucleus pulposus cell apoptosis by scavenging ROS". International Journal of Molecular Medicine 41, no. 5 (2018): 2485-2492. https://doi.org/10.3892/ijmm.2018.3461