富含α-2巨球蛋白的血清治疗大鼠膝关节创伤性骨关节炎的效果评价

Effects of Alpha-2-macroglobulin-rich serum on knee post-traumatic osteoarthritis in rats

目的探讨富含α-2巨球蛋白的血清(A2MRS)治疗大鼠膝关节创伤性骨关节炎的效果。方法取2个月龄、体重为250~300 g的80只SD雄性大鼠, 随机分为4组(n=20):A2MRS高剂量组、A2MRS低剂量组、阳性对照组大鼠采用前交叉韧带(ACL)切断术制备膝关节创伤性骨关节炎模型, 分别给予含α-2巨球蛋白20 μg/μL的A2MRS、10 μg/μL的A2MRS、生理盐水处理;空白对照组行膝关节假手术切开, 给予生理盐水治疗。采用苏木精-伊红染色、甲苯胺蓝染色、番红O固绿染色、改良Mankin评分、国际骨关节炎研究学会(OARSI)评分评估A2MRS治疗大鼠膝关节创伤性骨关节炎的效果。比较4组大鼠的治疗效果。结果与空白对照组相比, 阳性对照组大鼠的软骨变薄、表面不完整、有明显的裂隙, 软骨细胞减少、分布不均匀。阳性对照组大鼠的改良Mankin评分[(3.89±0.93)分]和OARSI评分[(10.05±0.72)分]均显著高于空白对照组大鼠[(0.67±0.07)、(3.10±0.29)分], 差异均有统计学意义(P<0.05)。与阳性对照组相比, A2MRS高剂量组和A2MRS低剂量组的软骨厚度增加、表面基本完整, 无明显的裂隙, 软骨细胞增加、分布较均匀。A2MRS高剂量组和A2MRS低剂量组大鼠的改良Mankin评分[(1.33±0.50)、(1.56±0.53)分]、OARSI评分[(6.30±0.64)、(4.75±0.66)分]均显著低于阳性对照组大鼠, 差异均有统计学意义(P<0.05);而A2MRS高剂量组与A2MRS低剂量组之间比较差异均无统计学意义(P>0.05)。结论 A2MRS可有效延缓膝关节创伤性骨关节炎的病理进程。

Objective:To explore the effects of Alpha-2-macroglobulin-rich serum (A2MRS) on knee post-traumatic osteoarthritis (PTOA).Methods:The knee PTOA models were constructed by transection of the anterior cruciate ligament (ACL) in 80 SD male rats, aged 2 months and weighing from 250 to 300 g, which were randomized into 4 groups ( n=20): a high dose group (A2MRS containing 20 μg/μL A2M administered), a low dose group (A2MRS containing 10 μg/μL A2M administered), a positive control group (normal saline administered), and a blank control group (the knee joint cut pseudooperatively and normal saline administered). HE, toluidine blue staining, safranine O staining, modified Mankin scoring and Osteoarthritis Research Society International (OARSI) scoring were conducted to evaluate and compare the therapeutic effects of A2MRS on the knee PTOA among the 4 groups. Results:The rat cartilage was thinner with patchy and cracked surface, and the chondrocytes were reduced and distributed unevenly in the positive control group, compared with the blank control group. The modified Mankin score (3.89±0.93) and OARSI score (10.05±0.72) in the positive control group were significantly higher than those in the blank control group (0.67±0.07 and 3.10±0.29) ( P<0.05). The rat cartilage was thicker with basically complete and crack-free surface, and the chondrocytes were increased and distributed more evenly in the high dose group and the low dose group, compared with the positive control group. The modified Mankin scores (1.33±0.50 and 1.56±0.53) and OARSI scores (6.30±0.64 and 4.75±0.66) in the high dose group and the low dose group were significantly lower than those in the positive control group ( P<0.05). However, there were no such differences between the high dose group and the low dose group ( P>0.05). Conclusion:A2MRS effectively delays the pathological process of knee PTOA.