To investigate the combined effect of bilateral ovariectomy (OVX) and anterior cruciate ligament transection (ACLT) with medial meniscectomy (MM) on the development of osteoarthritis (OA).
Twenty female 15-week-old Sprague-Dawley rats were used. Five rats in each group underwent bilateral OVX (OVX group), bilateral ACLT with MM (ACLT with MM group), bilateral OVX plus ACLT with MM (OVX plus ACLT with MM group), and sham surgery (SHAM group). All the rats were subjected to treadmill running for 4 weeks. The behavioral evaluation for induction of OA used the number of rears method, and this was conducted at 1, 2, and 4 weeks post-surgery. Bone mineral density (BMD) was calculated with micro-computerized tomography images and the modified Mankin's scoring was used for the histological changes.
The number of rears in the OVX plus ACLT with MM group decreased gradually and more rapidly in the ACLT with MM group. Histologically, the OVX plus ACLT with MM group had a significantly higher modified Mankin's score than the OVX group (p=0.008) and the SHAM group (p=0.008). BMDs of the OVX plus ACLT with MM group were significantly lower than the SHAM group (p=0.002), and the ACLT with MM group (p=0.003).
We found that bilateral OVX plus ACLT with MM induced definite OA change in terms of histology and BMD compared to bilateral OVX and ACLT with MM alone. Therefore, OVX and ACLT with MM was an appropriate degenerative OA rat model.
Citations
Method: The experimented rats were total 50 Sprague- Dawley female rats. They were divided randomly 5 groups. The treatment was initiated on the first day after surgery and continued for a period of 4 weeks. Bone measurements were performed in the distal femoral metaphysis and 5th lumbar vertebrae with dual energy x-ray absorptiometry at the time of 2nd week and 4th week after drug injection in all groups.
Results: The cancellous bone density in the ovariectomized rats treated with high dose of the salmon calcitonin microspheres was significantly higher than that of the free salmon calcitonin-treated ovariectomized rats, but less than that of the sham-operated control rats.
Conclusion: This study shows that the salmon calcitonin microspheres were evaluated for protection against the cancellous bone loss in the ovariectomized rats. The bone protective effect of the salmon calcitonin microspheres was greater than that of the free salmon calcitonin. (J Korean Acad Rehab Med 2003; 27: 121-125)
Objective: To confirm the effect of calcitonin injection relieving pain in ovariectomized rats.
Method: Thirty five Sprague-Dawley rats were randomly divided into five groups (high dose calcitonin group (112 U/ Kg), low dose calcitonin group (56 U/Kg), free calcitonin group, ovariectomy group, control group). To assess the pain in ovariectomized rats, the tail of rats were dived in waters of 50⁑1oC. Then the tail withdrawal time was measured (tail withdrawal test). The tail withdrawal test was performed in once a week for eight weeks. Results: 1. At seven and eight weeks after injection, the tail withdrawal time of high and low dose calcitonin group compared with that of ovariectomy group were significantly prolonged (p＜0.05). 2. At eight weeks after injection, the tail withdrawal time of free calcitonin group compared with that of ovariectomy group was significantly prolonged (p＜0.05).
Conclusion: The effect of calcitonin injection relieving pain in ovariectomized rats was found. (Korean Acad Rehab Med 2002; 26: 587-590)
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