Open Access

Resveratrol ameliorates inflammatory damage and protects against osteoarthritis in a rat model of osteoarthritis

  • Authors:
    • Yulong Wei
    • Jie Jia
    • Xin Jin
    • Wei Tong
    • Hongtao Tian
  • View Affiliations

  • Published online on: November 13, 2017     https://doi.org/10.3892/mmr.2017.8036
  • Pages: 1493-1498
  • Copyright: © Wei et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Resveratrol is a non‑flavonoid polyphenol compound with a stilbene structure. As a type of phytoalexin produced under stress in plants, it improves the plant's resistance against pathogens and environment deterioration, and performs important functions beneficial to human health, such as anti‑cancer, anti‑oxidation, regulating blood lipid levels and prolonging life span. The effects of resveratrol were examined in a rat model of osteoarthritis (OA) and observed to ameliorate inflammatory damage and protect against OA. In the present study, resveratrol significantly inhibited the induction of clinical scores in rats with OA. Resveratrol inhibited tumor necrosis factor‑α, interleukin (IL)‑1β, IL‑6 and IL‑18 expression levels, and decreased caspase‑3/9 activity in rats with OA. Inducible nitric oxide synthase, nuclear factor (NF)‑κB, phosphorylated‑(p)‑AMP‑activated protein kinase and sirtuin 1 protein expression were significantly suppressed and heme oxygenase 1 (HO‑1) and nuclear factor erythroid 2‑related factor 2 (Nrf‑2) protein expression was stimulated in rats with OA treated with resveratrol. The current results indicate that resveratrol ameliorates inflammatory damage and protects against OA in a rat model of OA via NF‑κB and HO‑1/Nrf‑2 signaling.

Introduction

Osteoarthritis (OA) is a common chronic degenerative joint disease, primarily characterized by degradation of cartilage, synovitis and subchondral bone remodeling, it is a disease that affects all joints in the body (1). The epidemiological survey did not identify that OA had obvious racial and regional differences (1). Arm arthritis accounts for 2–6% of disabilities in people aged >50 years, only secondary to vascular diseases in terms of long-term disability (2). Due to high morbidity and disability rates in the elderly, OA is considered to be one of the most common diseases affecting human health (3).

Nuclear factor (NF)-κB, a nuclear factor that specifically binds to the κB sequence of immunoglobulin K chain gene enhancer, is the central transcription factor, which participates in inflammation and the immune response. It is activated by interleukin (IL)-1β, tumor necrosis factor (TNF)-α and other cytokines, and rapidly induces the expression of multiple genes, which participate in immune reactions and the inflammatory response via a series of reactions, such as cytokine TNF-α, IL-1β, IL-6 and IL-18, inflammatory enzyme and matrix metalloproteinase (MMPs). Previous studies demonstrated that the NF-κB signaling pathway was activated in a rat model of OA (4,5).

The imbalance of the oxidation-reduction reaction leads to the accumulation of reactive oxygen species in the human body, which eventually results in oxidative stress (6). Under oxidative stress, large-molecular substances, such as proteins, lipids, DNA and RNA, and particularly damaged protein, lose their normal functions and their structures are impaired by oxidative damage (7).

Chondrocytes secrete more proinflammatory cytokines due to pathological factors, among which TNF-α and IL-1β perform the most important roles. These proinflammatory cytokines promote the formation of MMPs and speed up the extracellular matrix degradation of chondrocytes, significantly contributing to the destruction of the articular cartilage (8). Due to congestion, edema and the aggregation of inflammatory mediators, synovial inflammation induces synovial cells to secrete a variety of proteases and proinflammatory cytokines. Proteases, such as MMPS, contribute to degradation of the articular cartilage. Proinflammatory cytokines, such as TNF-α, IL-1β, IL-6 and IL-18 act on synovial cells and chondrocytes to increase the secretion of MMPS, and inhibit the synthesis of proteoglycan and collagen (9).

Resveratrol was first extracted from the root of Veratrum grandiflorum by a Japanese man in 1940 (10). Resveratrol is the active constituent of certain herbal medicines that treat inflammation, lipid metabolism disorder and heart diseases (11). As an important secondary metabolite of plants, resveratrol contributes to health care and a variety of important biological functions (12). Resveratrol protects the cardiovascular system by reducing myocardial ischemia reperfusion injury, dilating blood vessels and preventing against atherosclerosis (13). As resveratrol dilates blood vessels, it lowers blood pressure and reduces the risk of cardiovascular diseases (13). People have long used Polygonum cuspidatum, Polygonum multiflorum and other traditional Chinese medicines rich in resveratrol to treat and prevent against hyperlipidemia and atherosclerosis (13). Recent studies have also indicated that resveratrol is an effective constituent preventing against cardiac dysfunction (13,14). Thus, the aim of the present study was to determine the effects of resveratrol on inflammatory damage in a rat model of OA, and its underlying mechanism.

Materials and methods

Animals

All animal procedures were approved by the Animal Research Ethics Committee at Tongji Medical College (Wuhan, China). Male Wistar rats (age, 6 weeks, n=30), weighing 200–230 g, were purchased from Central Lab of Tongji Medical College (Wuhan, China). Animals were maintained at Tongji Medical College (Tongji, China) and housed three per cage in a room with controlled temperature conditions (21–22°C), controlled lighting (12-h light/dark cycle) and access to sterile food and water.

Induction of the OA model rat and grouping

The animals were randomized and assigned to three groups (n=10/per group) as follows: Sham group, OA model group and resveratrol treatment group. Following anesthetization with isoflurane (Sigma-Aldrich; Merck KGaA, Darmstadt, Germany), rats in the OA model group and the resveratrol treatment group were injected with intra-articular injection of monosodium iodoacetate (Sigma-Aldrich; Merck KGaA) through the patellar ligament into the intra-articular space of the right knee. Rats in the resveratrol treatment group were administered with 50 mg/kg/3 days resveratrol, for 8 weeks. Rats were sacrificed using decollation under 35 mg/kg pentobarbital sodium (Sigma-Aldrich; Merck KGaA), after treatment with resveratrol.

Clinical score of OA

A total score of 16 was recorded for each rat. The clinical score was measured as follows: 0, No swelling; 1, ≥0.1 mm increase in paw swelling or 1 digit; 2, ≥0.2 mm increase in paw swelling and two groups of inflamed joints; 3, ≥0.3 mm increase in paw swelling and two groups of inflamed joints; 4, ≥0.45 mm increase in paw swelling and two groups of inflamed joints (15).

Western blot analysis

Joint tissue samples were acquired from rats and washed with PBS. Total protein of the tissue samples was extracted using a protein radioimmunoprecipitation assay (Beyotime Institute of Biotechnology, Nantong, China) and Protein concentrations were measured using a Bicinchoninic Protein Assay kit (Beyotime Institute of Biotechnology). Equal quantities (50 µg) of total protein were separated by electrophoresis (80 V for 30 min and 120 V for 1 h) on 12% SDS-PAGE and electrophoretically transferred onto polyvinylidene difluoride membranes. Membranes were blocked with 5% skimmed milk in tris buffered saline with 0.1% Tween for 1 h at 37°C and incubated with NF-κB (cat. no. sc-56735, 1:1,000; Santa Cruz Biotechnology, Inc., Dallas, TX, USA), p-AMP-activated protein kinase (AMPK; 1:1,000; Santa Cruz Biotechnology, Inc.), sirtuin 1 (SIRT1; cat. no. sc-15404,1:1,000; Santa Cruz Biotechnology, Inc.), heme oxygenase 1 (HO-1; cat. no. sc-10789, 1:1,000; Santa Cruz Biotechnology, Inc.), nuclear factor erythroid 2-related factor 2 (Nrf-2; cat. no. sc-722, 1:1,000; Santa Cruz Biotechnology, Inc.) and GAPDH (cat. no. sc-25778, 1:1,000; Santa Cruz Biotechnology, Inc.) at 4°C after the membranes were washed with Tris-buffered saline with Tween 20. Membranes were developed using an ECL detection system (Beyotime Institute of Biotechnology) subsequent to incubation with peroxidase-conjugated secondary antibodies (cat. no. sc-2004, 1:5,000; Santa Cruz Biotechnology, Inc.) at 37°C for 1 h.

Statistical analysis

The results are presented as means ± standard deviation. Statistical analysis was performed by one-way analysis of variance for multiple comparisons and P<0.05 was considered to indicate a statistically significant difference.

Results

Resveratrol ameliorates the clinical scores in OA rat

There was a significant increase of clinical scores in OA rats compared with the control group (Fig. 1; P<0.01). Treatment with resveratrol significantly ameliorated the clinical scores in the OA rats when compared with the OA model (Fig. 1; P<0.01).

Resveratrol ameliorates TNF-α, IL-1β, IL-6 and IL-18 expression levels in OA rats

To investigate the protection mechanism of resveratrol on OA rats, TNF-α, IL-1β, IL-6 and IL-18 expression levels were measured. As shown in Fig. 2, TNF-α, IL-1β, IL-6 and IL-18 expression levels in the OA rats were significantly increased compared with the control group (Fig. 2; P<0.01). Treatment with resveratrol significantly ameliorated TNF-α, IL-1β, IL-6 and IL-18 expression levels in OA rats compared with the OA model rats (Fig. 2; P<0.01).

Resveratrol suppresses inducible nitric oxide synthase (iNOS), NF-κB, p-AMPK and SIRT1 protein expression levels in OA rats

To investigate the anti-inflammation effect of resveratrol in OA rat, iNOS, NF-κB, p-AMPK and SIRT1 protein expression levels were analyzed using western blotting. As shown in Fig. 3, there were significant increases in iNOS, NF-κB, p-AMPK and SIRT1 protein expression levels in OA rats when compared with the control rats (P<0.01). Treatment with resveratrol significantly suppressed the increased levels of iNOS, NF-κB, p-AMPK and SIRT1 protein expression in the OA rats, compared with the OA models (Fig. 3; P<0.01).

Resveratrol inhibits 3,4-methylenedioxyamphetamine (MDA) and superoxide dismutase (SOD) levels in OA rast

To further investigate the protection mechanism of resveratrol on OA rats, SOD and MDA levels were measured using ELISA kits. As presented in Fig. 4, OA effectively inhibited the SOD level and increased the MDA level in OA rats, when compared with the control group. Treatment with resveratrol significantly recovered the inhibited SOD level and reduced the increased MDA level in the OA rat, compared with the OA model (Fig. 4; P<0.01).

Resveratrol induces HO-1 and Nrf-2 protein expression levels in OA rats

The effect of resveratrol on HO-1 and Nrf-2 protein expression levels was evaluated in OA rats. As presented in Fig. 5, HO-1 and Nrf-2 protein expression levels were significantly lower in OA rats than in the control rats (P<0.01). Treatment with resveratrol significantly induced HO-1 and Nrf-2 protein expression levels in OA rats, compared with the OA model (Fig. 5; P<0.01).

Resveratrol reduces caspase-3/9 activity in OA rats

The anti-apoptosis effects of resveratrol were investigated in OA rats. As shown in Fig. 6, OA effectively induced caspase-3/9 activity in the OA rat models compared with the control group. Treatment with resveratrol significantly reduced caspase-3/9 activity in OA rats compared with the OA model (Fig. 6; P<0.01).

Discussion

OA, one of the most common chronic bone and joint degenerative diseases, may affect the joints of the limbs and spine, with pathological characteristics, including lesions in joint cartilage and subchondral bone (16). The clinical manifestations of OA primarily include pain, stiffness, deformation and limited movement of affected joints (17). Due to the aging population in China, the incidence of OA is increasing, with 50% of the population aged >60 years diagnosed with OA by X-ray, of which 35–50% present with clinical manifestations, and 80% of the population >75-years-old present with OA symptoms in China (18). In the current study, resveratrol treatment was found to ameliorate inflammatory damage, oxidative stress and neuronal apoptosis, and protect against OA in rat models of OA. This is consistent with Pan et al (12), who indicated that resveratrol protects against neonatal brain injury following hypoxia-ischemia via anti-apoptotic and anti-inflammatory effects (12).

The pathogenesis of OA remains unclear, although it has been confirmed that NO is significant in the incidence and development of OA (19). NO, an important regulatory factor participating in the differentiation and apoptosis of chondrocytes, inhibits the proliferation of chondrocytes and induces the apoptosis of chondrocytes. In addition, NO suppresses the synthesis of proteoglycan and type II collagen secreted by chondrocytes, and promotes the decomposition of cartilage extracellular matrix (20). NOS is the key enzyme inducing NO in patients with OA (9,20). Furthermore, the current data indicates that resveratrol significantly suppressed the increased levels of iNOS protein expression in OA rats. Wang et al (19) reported that resveratrol ameliorates the integrity of the blood-brain barrier by maintaining iNOS expression.

Studies of AMPK predominantly focused on energy metabolism, and very few studies investigate the association between AMPK and inflammatory reactions (21,22). However, increasing numbers of studies have demonstrated that AMPK exerted anti-inflammatory effects. For example, AMPK is pivotal in the regulation of energy metabolism in skeletal muscles, and is involved in energy metabolism and inflammation of skeletal muscles (23). In skeletal muscles, AMPK exerts anti-inflammatory effects by inhibiting the expression level of NF-κB (24). Activation of the NF-κB signaling pathway, a pro-inflammatory signaling pathway in the skeletal muscle cells of mice, may be inhibited by AMPK, and peroxisome proliferation activated receptor inhibits skeletal muscular inflammation and insulin resistance by inhibiting endoplasmic reticulum stress via the AMPK-dependent signaling pathway (22). In the present study, resveratrol significantly suppressed AMPK protein expression levels in OA rats. Meng et al (21) demonstrated that resveratrol attenuated estrogen deficient-induced cardiac dysfunction through enhancement of SIRT1/AMPK activity (21).

NF-κB is stimulated by various factors, such as TNFs and ILs (24). Activated NF-κB dissociates from its inhibitory proteins and translocates into the nucleus from the cytoplasm, and binds to specific sequences (at the κB site) of promoter/enhancer, located upstream of the NF-κB signaling pathway, to adjust the expression levels of target genes (19,24). The activated NF-κB signaling pathway leads to the transcription of a series of downstream target genes, resulting in associated biological effects, such as the generation of inflammatory factors and the induction of chondrocyte apoptosis (10). Furthermore, resveratrol significantly reduced the level of NF-κB protein expression in OA rats.

SIRT1 is expressed in human articular chondrocytes and cartilage; however, its expression level in joint chondrocytes is lower than that in normal chondrocytes of patients with OA (25). In addition, it has been found that SIRT1 promotes the expression of cartilage specific genes, and enhances the anti-stress ability of chondrocytes, promotes cell survival and inhibits chondrocyte apoptosis, indicating that SIRT1 prevents against OA by inhibiting the aging and apoptosis of chondrocytes (26). These findings indicate that resveratrol significantly reduces SIRT1 protein expression levels in OA rats. Gan et al (27) demonstrated that resveratrol reduced acute kidney injury in septic rats via SIRT1 and de-acetylated NF-κB-P65 (27).

HO-1/Nrf-2 has been confirmed to act against oxidation, proliferation of malignant cells, apoptosis and inflammation, indicating that HO-1/Nrf-2 is a protective molecule in the body and has been used for the treatment of various diseases (28). At present, studies indicate that HO-1 alleviates lupus nephritis; an experimental study with animal models of elastase-induced emphysema indicated that gene therapy with adenovirus vector-mediated HO-1/Nrf-2 exerted a sound curative effect (29). In addition, HO-1/Nrf-2 gene-transfected chemical induction therapy and gene therapy are effective in the treatment of heart and liver injury induced by ischemia reperfusion, lipopolysaccharide-induced intraocular inflammation and cardiac allograft rejection (30). By contrast, studies on patients lacking HO-1/Nrf-2 indicated that HO-1/Nrf-2 deficiency may delay and worsen inflammation (31). Taken together, the current data suggests that resveratrol significantly reduced caspase-3/9 activity in OA rats. Cheng et al (32) reported that resveratrol attenuates inflammation and oxidative stress via the Nrf-2/antioxidant responsive element signaling pathway in myocardial ischemia-reperfusion injury (32).

In conclusion, the current study demonstrated that resveratrol ameliorates inflammatory damage, oxidative stress and neuronal apoptosis, and protects against OA in rat models of OA, via further suppression of NF-κB and activation of HO-1/Nrf-2 signaling. Thus, resveratrol may present as an effective therapeutic strategy for patients with OA. However, this study only used a rat model, and therefore requires further study in other models or clinical trials.

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Wei Y, Jia J, Jin X, Tong W and Tian H: Resveratrol ameliorates inflammatory damage and protects against osteoarthritis in a rat model of osteoarthritis. Mol Med Rep 17: 1493-1498, 2018
APA
Wei, Y., Jia, J., Jin, X., Tong, W., & Tian, H. (2018). Resveratrol ameliorates inflammatory damage and protects against osteoarthritis in a rat model of osteoarthritis. Molecular Medicine Reports, 17, 1493-1498. https://doi.org/10.3892/mmr.2017.8036
MLA
Wei, Y., Jia, J., Jin, X., Tong, W., Tian, H."Resveratrol ameliorates inflammatory damage and protects against osteoarthritis in a rat model of osteoarthritis". Molecular Medicine Reports 17.1 (2018): 1493-1498.
Chicago
Wei, Y., Jia, J., Jin, X., Tong, W., Tian, H."Resveratrol ameliorates inflammatory damage and protects against osteoarthritis in a rat model of osteoarthritis". Molecular Medicine Reports 17, no. 1 (2018): 1493-1498. https://doi.org/10.3892/mmr.2017.8036