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首页> 中文期刊> 《中国组织工程研究》 >木瓜蛋白酶诱导早期膝骨关节炎模型大鼠软骨超微结构的动态变化

木瓜蛋白酶诱导早期膝骨关节炎模型大鼠软骨超微结构的动态变化

         
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BACKGROUND:Papain-induced rat knee osteoarthritis is a common modeling method, which can obtain a stable osteoarthritis model. OBJECTIVE:To observe the change of ultrastructure of chondrocytes in the early process of papain-induced rat knee osteoarthritis under transmission electron microscope. METHODS:A total of 18 Sprague-Dawley rats were randomly divided into three groups. Two rats were considered as a normal control group, without intervention. The mixture of papain and L-cysteine was injected in right knee joint cavity of 16 rats to induce osteoarthritis models (osteoarthritis model group). Physiological saline was injected in the left side (physiological saline control group). At 1, 2, 4 and 6 weeks after injection, samples were col ected. Transmission electron microscope was used to observe the change of cartilage ultrastructure of the medial femoral condyle joint. RESULTS AND CONCLUSION:For the normal control group and physiological saline control group, their cytoplasm contained abundant rough endoplasmic reticulum and mitochondria. After 1 week of injection, mitochondria vacuoles and light expanded rough endoplasmic reticulum were visible. Two weeks later, lipid droplets appeared, mitochondria degeneration was distinct, vacuolization was serious and its number was reduced, and rough endoplasmic reticulum expansion was obvious. Four weeks later, lipid droplets became increased, and the number of mitochondria decreased significantly. Most of the rough endoplasmic reticula were highly expanded, and part of the rough endoplasmic reticula were dissolved and fractured. Six weeks later, a number of lipid droplets were visible in cytoplasm, most of the mitochondria disappeared, only a smal number of mitochondria existed, and most of the rough endoplasmic reticula were dissolved and fractured. These results confirmed that cartilage ultrastructure changes gradual y in the early process of papain-induced rat knee osteoarthritis under transmission electron microscope.%背景：木瓜蛋白酶诱导大鼠膝关节骨性关节炎是常用造模方法，能获得稳定的骨关节炎模型。　　目的：观察木瓜蛋白酶诱导大鼠膝早期骨关节炎进程中透射电镜下关节软骨细胞超微结构的变化规律。　　方法：将18只SD大鼠随机分为3组，2只为正常对照组不做干预；16只大鼠右膝关节腔注射木瓜蛋白酶和L-半胱氨酸混合液诱导骨关节炎模型(骨关节炎模型组)，左侧注射生理盐水(生理盐水对照组)。注射后第1，2，4，6周后分别取材，使用透射电镜观察股骨内侧髁关节软骨超微结构变化。　　结果与结论：正常对照组和生理盐水对照组胞质内有丰富的粗面内质网、线粒体。骨关节炎模型组注射1周后，线粒体空泡化，可见轻度扩张的粗面内质网；2周后，出现脂滴，线粒体变性明显，空泡化严重，数目减少，粗面内质网扩张明显；4周后，脂滴增多，线粒体数目明显减少，大部分粗面内质网高度扩张，部分粗面内质网溶解断裂；6周后，胞质内见数个脂滴，大部分线粒体消失，仅有少量线粒体存在，大部分粗面内质网断裂溶解。说明木瓜蛋白酶诱导大鼠膝早期骨关节炎进程中透射电镜下软骨超微结构呈渐进性变化。

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