Protective effect of zoledronic acid on articular cartilage and subchondral bone of rabbits with experimental knee osteoarthritis

She,Guorong; Zhou,Ziqi; Zha,Zhengang; Wang,Fei; Pan,Xiaoting

doi:10.3892/etm.2017.5135

Protective effect of zoledronic acid on articular cartilage and subchondral bone of rabbits with experimental knee osteoarthritis

Authors:
- Guorong She
- Ziqi Zhou
- Zhengang Zha
- Fei Wang
- Xiaoting Pan
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Affiliations: Department of Orthopedics, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China, Department of Radiation Therapy, Peking Union Medical College Hospital (East), Beijing 100000, P.R. China, Department of Bone and Joint Surgery, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China, Department of Medical Imaging Center, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China, Department of Pathology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China
Published online on: September 19, 2017 https://doi.org/10.3892/etm.2017.5135
Pages: 4901-4909
Copyright: © She et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Subchondral bone reabsorption and remodeling are responsible for the initiation and progression of osteoarthritis (OA). Zoledronic acid (ZOL), a third‑generation bisphosphonate (BIS), is an inhibitor of bone reabsorption. However, the intervention effect of ZOL on OA has not been fully characterized and remains to be directly demonstrated in animal experiments. The present study examined the microscopic and macroscopic changes in the anterior cruciate ligament transection (ACLT) model of OA in rabbits and evaluated the effects of ZOL on cartilage degeneration and subchondral bone loss. A total of 32 New Zealand white rabbits were randomly divided into four groups: High‑, medium‑ and low‑dose ZOL groups, which received an intravenous injection of 250, 50 and 10 µg/kg ZOL, respectively, after modeling, as well as an untreated group. The bone mineral density (BMD) of the knee joint was evaluated by dual‑energy X‑ray absorptiometry scanning immediately after modeling and at 4 and 8 weeks. At week 8, quantitative measurement of cartilage was performed by a specialized magnetic resonance imaging (MRI) technique, including three‑dimensional fat‑suppressed spoil gradient‑recalled sequence and T2 mapping. The rabbits were sacrificed by air embolism after anesthesia and both knee joints were harvested and evaluated by general and histological observation. Toluidine blue and hematoxylin and eosin staining were used to assess histological changes in the articular cartilage. Quantitative analysis of cartilage histopathology was performed according to the Mankin scoring system. The BMD of ACLT joints dropped after modeling, which was effectively suppressed by ZOL at the high and medium dose but not the low dose. MRI scans demonstrated that in the untreated group, articular cartilages on ACLT knees were thinner than those on normal knees. The high dose of ZOL preserved the cartilage tissue thickness more efficiently than the medium and low doses. Observation of specimens and pathological slices revealed that the articular cartilage degeneration in the high‑dose ZOL group was lightest, while that in the medium‑ and low‑dose ZOL group was moderate, and the untreated group exhibited the most severe defect. The untreated group had the highest Mankin score, whereas the high‑dose ZOL group had the lowest score. In conclusion, ZOL increased the subchondral bone density, improved the microstructure and reduced the degeneration of articular cartilage in OA according to morphological as well as quantitative observation. ZOL exerted significant chondroprotective effects in a dose‑dependent manner. A favorable chondroprotective effect was induced at the dose of 250 µg/kg. ZOL may represent a novel promising drug to complement the treatment of OA.

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