Open Access

A study on the prevention and treatment of murine calvarial inflammatory osteolysis induced by ultra‑high‑molecular‑weight polyethylene particles with neomangiferin

  • Authors:
    • Hong‑Tao Wang
    • Jia Li
    • Shi‑Ting Ma
    • Wen‑Yu Feng
    • Qi Wang
    • Hong‑Yan Zhou
    • Jin‑Min Zhao
    • Jun Yao
  • View Affiliations

  • Published online on: September 11, 2018     https://doi.org/10.3892/etm.2018.6725
  • Pages: 3889-3896
  • Copyright: © Wang 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 aimed to examine the influence of neomangiferin on murine calvarial inflammatory osteolysis induced by ultra‑high‑molecular‑weight polyethylene (UHMWPE) particles. Eight‑week‑old male C57BL/J6 mice served as an inflammatory osteolysis model, in which UHMWPE particles were implanted into the calvarial subperiosteal space. The mice were randomly distributed into four groups and treated with different interventions; namely, a sham group [phosphate‑buffered saline (PBS) injection and no UHMWPE particles], model group (PBS injection and implantation of UHMWPE particles), low‑dose neomangiferin group (UHMWPE particles +2.5 mg/kg neomangiferin), and high‑dose neomangiferin group (UHMWPE particles +5 mg/kg neomangiferin). Following 3 weeks of feeding according to the above regimens, celiac artery blood samples were collected for an enzyme‑linked immunosorbent assay (ELISA) to determine the expression of receptor activator of nuclear factor‑κB ligand (RANKL), osteoclast‑related receptor (OSCAR), cross‑linked C‑telopeptide of type I collagen (CTX‑1); osteoprotegerin (OPG), tumor necrosis factor (TNF)‑α, and interleukin (IL)‑1β. Subsequently, the mice were sacrificed by cervical dislocation following ether‑inhalation anesthesia, and the skull was separated for osteolysis analysis by micro‑computed tomography (micro‑CT). Following hematoxylin and eosin staining, tartrate‑resistant acid phosphatase (TRAP) staining was performed to observe the dissolution and destruction of the skull. The micro‑CT results suggested that neomangiferin significantly inhibited the murine calvarial osteolysis and bone resorption induced by UHMWPE particles. In addition, the ELISA results showed that neomangiferin decreased the expression levels of osteoclast markers RANKL, OSCAR, CTX‑1, TNF‑α and IL‑1β. By contrast, the levels of OPG increased with the neomangiferin dose. Histopathological examination revealed that the TRAP‑positive cell count was significantly reduced in the neomangiferin‑treated animals compared with that in the positive control group, and the degree of bone resorption was also markedly reduced. Neomangiferin was found to have significant anti‑inflammatory effects and to inhibit osteoclastogenesis. Therefore, it has the potential to prevent the aseptic loosening of a prosthesis following artificial joint replacement.

Introduction

Currently, it is suggested that the main reason for aseptic loosening (AL) of an artificial joint prosthesis is due to an inflammatory osteolytic reaction induced by wear particles (1,2). Studies have suggested that wear particles, including metal particles (titanium, cobalt), ultra-high-molecular-weight polyethylene (UHMWPE), and polymethylmethacrylate, are largely responsible for the initial stage and progression of an inflammatory osteolytic reaction (36). A chronic inflammatory reaction induced by wear particles triggers macrophage infiltration and cytokine release associated with osteolysis, suppression of osteoblast proliferation and differentiation, and promotion of osteoclast activation. Therefore, osteoclast differentiation induced by wear particles is a determinant of inflammatory osteolysis (710). The receptor activator of nuclear factor-κB (RANK)-RANK ligand (RANKL)-osteoprotegerin (OPG) signal transduction pathway is a crucial signaling pathway for osteoclast differentiation and maturation and influences the key process of osteolysis around the prosthesis. Medication inhibiting osteoclast activity is an effective method of treating osteolysis. Drugs, including estrogen and bisphosphonates, can inhibit bone resorption; however, significant side effects limit their long-term use. There is a herbal decoction that inhibits osteoclast action in the treatment of osteoporosis, in which neomangiferin is one of the important active ingredients. Neomangiferin, derived from Anemarrhena plants, has a molecular formula of C25H28O16 and molecular weight of 584.4802. In addition, neomangiferin has anti-inflammatory, antioxidant, anti-osteoporotic, and liver and kidney protective biological activities (1114). In our previous experiments (Wang et al; unpublished data), it was found that neomangiferin inhibited osteoclast differentiation in vitro, however, the exact mechanism remains to be elucidated. Therefore, the purpose of the present study was to investigate the role of neomangiferin in the inhibition of inflammatory osteolysis through in vivo animal experiments and to examine the possible mechanism of action of neomangiferin, thereby providing therapeutic options for the prevention or treatment of metabolic bone diseases induced by wear particles.

Materials and methods

Preparation of the UHMWPE particle suspension

Pure UHMWPE particles were purchased from Germany Clariant (Gersthofer, Germany). The average particle diameter was 1.84±1.50 µm. It was estimated that >32% of the particles were <1 µm in size. The UHMWPE particles were soaked in 75% ethanol for 48 h to remove toxins; subsequently, the cells were cryogenically sealed with standard ethylene oxide. The UHMWPE particles were cleaned three times with phosphate-buffered saline (PBS) and formulated into a 100-mg/ml UHMWPE particle suspension with cryogenic PBS prior to use.

Animals

The animal model was designed according to previous reports (15,16). The neomangiferin was screened for osteoclast differentiation, and it was found that the neomangiferin inhibited the formation of osteoclasts at a concentration of 2.5 µmol/l (data not shown). The concentration of Chinese herbs required to inhibit osteoclasts in vivo is a low concentration of 1–10 mg/kg and a high concentration of 2–30 mg/kg (1718). In the present study, the doses in vivo were calculated (low and high concentrations of 2.5 and 5 mg/kg, respectively) according to the weight of mice and the content of body fluid (data not shown). A total of 24, 8 week old C57BL/6 mice (specific pathogen free grade) were provided by the Experimental Animal Center of Guangxi Medical University (Nanning, China). Mice were housed at a temperature of 22–24°C, a humidity of 56% and interval lighting (12 h dark/light cycle), with regular ventilation. All mice were fed standard laboratory chow with ad libitum water, but were fasted from 10:00 to 15:00 prior to experimentation. The animals were randomly divided into four groups (n=6 per group): Negative control group (injected with PBS only); positive control group (UHMWPE particles + PBS); neomangiferin (purity >98% by high-performance liquid chromatography; Chengdu Manster Biotechnology Co., Ltd., Sichuan, China), low-dose group (UHMWPE particles + 2.5 mg/kg neomangiferin), and neomangiferin high-dose group (UHMWPE particles + 5 mg/kg neomangiferin). The animal experimental protocol was approved by the Animal Ethics Committee of Guangxi Medical University (approval no. 201707006), and the Guidelines for Care and Use of Laboratory Animals were strictly followed.

According to the body weight of each mouse, anesthesia was induced intraperitoneally with 4% chloral hydrate (400 mg/kg mouse body weight). Following successful anesthesia, a depilatory agent was used to adequately remove iodine from the hair of the mouse. Following placement on a disposable sterile towel, the mouse skull sagittal line and mouse bilateral external auditory canal connection was selected as a reference point. Subsequently, via the midpoint of the connection, incisions of the skin and subcutaneous tissue were made using 15 small circular knives. Mouse calvarial bone was fully exposed in an area of ~1×1 cm of full-range periosteum. A 2×2 mm periosteum defect area was created using a small round knife at the top of the cranium. The control group was syringe-injected with sterile PBS (100 µl); the other three groups were injected with UHMWPE particles (100 µl, 100 mg/ml). The skin wound was closed with sutures postoperatively to prevent drug spillover. Following these procedures, the mice were housed separately. Penicillin was routinely used to ensure anti-infective surgery. At 2 days post-surgery, the negative control group and the positive control group were injected with 100 µl PBS; the other two groups were injected with neomangiferin at 2.5 or 5 mg/kg. The drug was injected every other day for 21 days. None of the mice died; therefore, the model was successful (19,20). At 3 weeks post-surgery, each group of mice was anesthetized with ether, and blood samples from the celiac artery were collected for ELISA assays. The mice were sacrificed by cervical dislocation, following which the intact skull was collected, trimmed, and immersed in 10% paraformaldehyde for fixing and later use.

Serum ELISA

In each group, blood was collected from the celiac artery of the mouse. Subsequently, serum was prepared via centrifugation (350 × g for 10 min at 4°C) and analyzed using an ELISA kit (Wuhan Landing Medical Hi-Tech Co., Ltd., Hubei, China). The levels of osteoclast-related receptor (OSCAR), RANKL, cross-linked C-telopeptide of type I collagen (CTX-1), OPG, interleukin lβ (IL-1β), and tumor necrosis factor (TNF)-α were assayed.

Micro-computed tomography (micro-CT) examination

Following fixing in paraformaldehyde (40 g/l) solution for 1 day, the skulls from each group, with UHMWPE particles removed, were scanned by micro-CT (Skyscan1176; Bruker microCT, Kontich, Belgium). The parameters were set as follows: Resolution 18 µm, current 100 mA, voltage 80 kV, and exposure time 100 ms. Bone mineral density (BMD) and the bone volume/tissue volume ratio (BV/TV) were analyzed by software measurement (Skyscan1176; Skyscan CT analyser v1.115.2.2+; Bruker microCT). Bone resorption pits and porosity were quantified using Image J software (version 1.36; NIH, Bethesda, MA, USA).

Histological analysis

Following micro-CT examination, the skulls in each group were placed in an EDTA solution for decalcification. The decalcification solution was replaced every 2 days. The samples were embedded in paraffin and sectioned (section thickness 4 µm). Five consecutive sections were stained with hematoxylin and eosin (H&E) for each specimen to observe the inflammatory osteolysis necrotic responses. Subsequently, tartrate-resistant acid phosphatase (TRAP) reagent (Sigma, EMD Millipore, Billerica, MA, USA) staining was applied. The sections were placed in the TRAP scanning liquid and incubated for 50 min at 37°C, until red wine-colored staining of the osteoclasts was observed under an optical microscope (DM4000B; Leica Microsystems GmbH, Wetzlar, Germany). High-power microscopic examination of images was performed as follows: Each section was subjected to osteoclast counting in five visual fields. Using Image Pro-Plus 6 software (Media Cybernetics, Inc., Bethesda, MD, USA), TRAP staining analysis (+) was performed to determine the number of osteoclasts and region of osteolysis.

Statistical analysis

Experimental results are represented as the mean ± standard deviation. Statistical analyses were performed with the SPSS Statistics Package 19.0 (IBM SPSS, Armonk, NY, USA). One-way analysis of variance (ANOVA) was performed to compare groups. If P<0.05 in AVONA, the SNK-q test was used for any pairwise comparisons; P<0.05 was considered to indicate a statistically significant difference.

Results

Micro-CT scanning

The Micro-CT examination revealed, as shown in Fig. 1A, that the skull surface in the vehicle group underwent severe destruction. By contrast, in the sham group of mice, the skull surface was smooth, without significant osteolysis. In the vehicle group and the low- and high-dose neomangiferin groups, osteolysis occurred to varying degrees. Specifically, the surface area of the skull samples was characterized in terms of the depth of bone resorption fossa. The above data showed that the UHMWPE particles induced osteolysis. Neomangiferin significantly inhibited bone destruction, increased BMD (Fig. 1B) and BV/TV (Fig. 1C), and decreased the number of bone resorption pits and total porosity within the skull region of interest (Fig. 1D and E). This analysis confirmed that neomangiferin effectively inhibited the calvarial osteolysis induced by UHMWPE particles. Following neomangiferin treatment, skull destruction was mild, with less damage observed in the high-dose neomangiferin group. The analysis of bone status (Fig. 1B-E) confirmed that the effect of high-dose neomangiferin on bone resorption was significantly greater than that of low-dose neomangiferin.

Histopathological analysis via H&E staining and TRAP staining

Inflammatory cells, macrophages, and multinucleated osteoclasts were detected in the skulls of mice that received UHMWPE particles (Fig. 2A). In agreement with the micro-CT examination results, TRAP staining showed that a greater number of positively stained cells were observed on the cranial surface of the vehicle group (Fig. 2B). The quantity of TRAP-positive cells was decreased as the neomangiferin dose increased (Fig. 2C). In addition, the histomorphological observations revealed that the area of bone erosion was markedly decreased following neomangiferin application (Fig. 2D). Therefore, these results indicated that neomangiferin inhibited UHMWPE particle-induced osteolysis.

Expression of RANKL, OSCAR, OPG, CTX-1, TNF-α and IL-1β

The ELISA results of celiac arterial blood showed that the expression levels of TNF-α and IL-1β in the drug treatment groups were lower those in the positive control group, and the greater the dose, the lower the concentration (Fig. 3A and B). The expression levels of RANKL, OSCAR and CTX-1 were highest in the positive control group compared with those in the other groups (P<0.05; Fig. 4A-C). In addition, the expression of CTX-1, RANKL and OSCAR decreased with the increase in neomangiferin dose. The expression of OPG was the lowest in the positive control group. In the high-dose neomangiferin group, the expression of OPG was significantly increased (Fig. 4D). Neomangiferin reduced the expression of RANKL, OSCAR and CTX-1, increased the expression of OPG, and inhibited the expression of proinflammatory factors TNF-α and IL-1β. These results were consistent with the previous ELISA analysis, micro-CT examination, and pathological observations. Therefore, these findings suggested that neomangiferin inhibited osteoclast proliferation and differentiation during UHMWPE particle-induced osteolysis, and thereby protected and promoted osteoblast differentiation.

Discussion

AL is one of the main reasons for the failure of artificial joint replacements, and prosthesis loosening is considered to be associated with several factors. Studies have shown that the AL of prostheses is associated with extensive infiltration of wear particles. Prosthetic wear particle-induced osteolysis at the bone interface (prosthesis-osteoclastic interface) is a leading cause of loosening of prostheses (21). The prosthesis wear particles can induce an inflammatory reaction involving macrophages in the tissue surrounding the prosthesis, osteoclast activation, and inhibition of osteogenic gene expression (2224). Inhibition of an early inflammatory response can guarantee implant bone interface stability at the early stage, thereby reducing the influence of wear particles and the physical transfer of the inflammatory media (25). Therefore, inhibiting the inflammatory reaction caused by wear particles and inhibiting osteoclast differentiation are some of the primary means to reduce or prevent the prosthetic loosening. However, there remains a lack of modalities and drugs for the treatment of these problems, and side effects are difficult to manage (2630). The extract of a Chinese herbal medicine has shown efficacy and mild side effects, thus providing an innovative idea for the treatment of bone destruction-related diseases (3134). Neomangiferin is a compound from a Chinese medicine substance, which has antioxidative, anti-inflammatory, antiviral, immunoregulatory and antitumor effects (11,35). Neomangiferin is more bioactive than previous forms of mangiferin in order to have a more marked effect on osteolysis (36,37). The traditional Chinese medicine Erxian decoction can promote bone tissue formation, suppress bone resorption and increase bone mineral density, and neomangiferin is one of the main active ingredients. In our previous study, it was found that neomangiferin inhibited osteoclast differentiation in vitro, whereas in vivo neomangiferin inhibited the inflammatory osteolytic effect; however, the possible mechanism remained to be fully elucidated. The mouse model of calvarial inflammatory osteolysis induced by UHMWPE particles used in the present study can simulate joint aseptic osteolysis. Neomangiferin treatment of this tissue environment inhibited osteoclast formation; therefore, it was analyzed for possible curative effects on osteolysis. Specifically, the possible mechanisms underlying the inhibition of UHMWPE particle-induced inflammatory osteolysis were examined.

The results of the micro-CT and histological morphological analyses showed that neomangiferin attenuated UHMWPE particle-induced osteolysis of the skull. In addition, with increased drug concentration, neomangiferin reduced the number of osteoclasts and bone damage. In terms of the mechanism underlying the neomangiferin-driven suppression of osteolysis, the following two assumptions can be made: First, the animal model with neomangiferin injection demonstrated inhibition of osteoclast activity. Prosthesis wear particles stimulate monocyte-derived precursor cell macrophages to differentiate into osteoclasts and enhance their activity, thereby disrupting the dynamic balance of bone resorption and bone formation (38,39). Therefore, the inhibition of osteoclast proliferation and differentiation is a key treatment aim for osteolysis induced by wear particles. In the present study, compared with the negative control group, the number of TRAP-positive cells in the UHMWPE particle group increased significantly. By contrast, the number of TRAP-positive cells in the animal model treated with neomangiferin was significantly lower than in the UHMWPE particle group. In the present study, following neomangiferin treatment, the extent of skull erosion and severity of damage were significantly decreased. Combined with results of the previous experiment, the present data suggested that neomangiferin may inhibit osteoclast formation and differentiation, thus inhibiting osteolysis. Second, neomangiferin may inhibit bone destruction by disrupting the dynamic balance between OPG and RANKL. The combination of RANKL and RANK can regulate the phosphorylation of several downstream signal pathways, including NF-κB, nuclear factor of activated T-cells, and extracellular signal-regulated kinase, in addition to promoting osteoclast proliferation and differentiation, and activating osteoclast maturation to induce bone resorption (40). OPG is expressed in bone marrow stromal cells and osteoblasts. By binding to RANKL, OPG inhibits the binding of RANKL to RANK and prevents the overproduction of osteoclasts (41). Wear particle-induced inflammatory osteolysis can upregulate the expression level of RANKL and inhibit the expression of OPG, thereby inducing osteoclast formation and promoting bone resorption (4244). Therefore, the dynamic balance of OPG and RANKL affects the wear particle-induced level of osteolysis (45). Compared with the negative control group, the expression levels of OSCAR, RANKL and CTX-1 were increased in the positive control group, whereas that of OPG was decreased. Following 3 weeks of neomangiferin treatment, the expression level of OPG was increased, whereas the expression levels of RANKL, OSCAR and CTX-1 were decreased. Based on the above results, it was hypothesized that neomangiferin suppresses the osteolysis induced by UHMWPE particles by regulating the expression of RANKL and OPG.

Wear particles can induce monocytes to produce cytokines, including IL-1β and TNF-α, within the OPG-RANKL-RANK signaling pathway and induce the activation of monocyte-derived macrophage precursor cells (46,47). Additionally, wear particles can transform them into activated osteoclasts, induce fibroblast release of collagenase and prostaglandin E2 associated with bone resorption, and inhibit type I collagen synthesis and osteocalcin in osteoblasts (8), and thus accelerate bone destruction and osteolysis. In the present study, the results of micro-CT, H&E staining, TRAP staining, and serological ELISA showed that the number of osteoclasts and bone resorption pits in the neomangiferin group decreased with increasing drug concentration. Consequently, the extent of damage decreased in the region of mouse calvarial bone resorption. The experiments showed that UHMWPE particles significantly upregulated the expression of inflammatory cytokines, however, neomangiferin significantly inhibited the expression of IL-1β and TNF-α and osteoclastogenesis. TNF-α and IL-1β are the major inflammatory cytokines found in the surrounding tissues of loose prostheses. They are considered as an effective medium for bone resorption. The expression and activity of RANKL are regulated by these proinflammatory cytokines, further supporting their key role in wear particle-induced osteolysis (41,48,49). Furthermore, the inhibitory effect was dose-dependent. Therefore, neomangiferin may inhibit the inflammatory bone resorption induced by UHMWPE particles by reducing the secretion of proinflammatory cytokines and by reducing osteoclastogenesis.

In conclusion, the in vivo experiments showed that neomangiferin inhibited the activation of osteoclasts and thereby influenced the UHMWPE particle-induced osteolystic process. However, the possible mechanism is to be determined in future experiments. In this process, the anti-inflammatory effects of neomangiferin and its ability to modulate the expression of RANKL and OPG may be important. These results show that neomangiferin may be a promising treatment of wear particle-induced inflammatory osteolysis.

Acknowledgements

Not applicable.

Funding

This study was supported by the Guangxi Natural Science Foundation (grant no. 2017GXNSFAA198258).

Availability of data and materials

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

Authors' contributions

J-MZ and JY designed the current study; H-TW, JL, S-TM, W-YF, QW and H-YZ performed the experiments, analyzed the data and prepared the figures; H-TW wrote the manuscript. All authors reviewed the article.

Ethics approval and consent to participate

The animal protocol was approved by the Animal Ethics Committee of Guangxi Medical University (approval no. 201707006), and the Guidelines for Care and Use of Laboratory Animals were strictly followed.

Consent for publication

Not applicable.

Competing interests

The authors confirm that they have no competing interests.

Glossary

Abbreviations

Abbreviations:

AL

aseptic loosening

BMD

bone mineral density

BV/TV

bone volume/tissue volume ratio

ELISA

enzyme-linked immunosorbent assay

H&E

hematoxylin and eosin

micro-CT

micro-computed tomography

PBS

phosphate-buffered saline

TRAP

tartrate-resistant acid phosphatase

UHMWPE

ultra-high-molecular-weight polyethylene

RANKL

receptor activator of nuclear factor-κB ligand

OSCAR

osteoclast-related receptor

CTX-1

cross-linked C-telopeptide of type I collagen

OPG

osteoprotegerin

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November-2018
Volume 16 Issue 5

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Online ISSN:1792-1015

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Spandidos Publications style
Wang HT, Li J, Ma ST, Feng WY, Wang Q, Zhou HY, Zhao JM and Yao J: A study on the prevention and treatment of murine calvarial inflammatory osteolysis induced by ultra‑high‑molecular‑weight polyethylene particles with neomangiferin. Exp Ther Med 16: 3889-3896, 2018
APA
Wang, H., Li, J., Ma, S., Feng, W., Wang, Q., Zhou, H. ... Yao, J. (2018). A study on the prevention and treatment of murine calvarial inflammatory osteolysis induced by ultra‑high‑molecular‑weight polyethylene particles with neomangiferin. Experimental and Therapeutic Medicine, 16, 3889-3896. https://doi.org/10.3892/etm.2018.6725
MLA
Wang, H., Li, J., Ma, S., Feng, W., Wang, Q., Zhou, H., Zhao, J., Yao, J."A study on the prevention and treatment of murine calvarial inflammatory osteolysis induced by ultra‑high‑molecular‑weight polyethylene particles with neomangiferin". Experimental and Therapeutic Medicine 16.5 (2018): 3889-3896.
Chicago
Wang, H., Li, J., Ma, S., Feng, W., Wang, Q., Zhou, H., Zhao, J., Yao, J."A study on the prevention and treatment of murine calvarial inflammatory osteolysis induced by ultra‑high‑molecular‑weight polyethylene particles with neomangiferin". Experimental and Therapeutic Medicine 16, no. 5 (2018): 3889-3896. https://doi.org/10.3892/etm.2018.6725