大骨节病关节软骨细胞凋亡及其相关调控因子的表达

目的 探讨大骨节病患者关节软骨细胞凋亡及相关调控因子Bcl-2、Bax、Fas及iNos表达分布的特点。方法 收集15例大骨节病儿童和15例正常对照儿童关节软骨。采用脱氧核糖核酸末端转移酶介导的脱氧核糖核酸缺口标记(TUNEL)技术和Bcl-2、Bax、Fas及iNos蛋白免疫组化抗生物素蛋白-生物素-碱性磷酸酶(B-SA)法染色,观察大骨节病儿童和正常对照儿童关节软骨的凋亡细胞和Bcl-2、Bax、Fas及iNos蛋白阳性表达细胞的密度与分布。结果 (1)大骨节病儿童关节软骨中层凋亡阳性细胞数[(33.60±2.71)%]较正常关节软骨[(1.33±0.41)%]显著增多(t=11.59,P<0.01);(2)大骨节病儿童关节软骨表层和中层Bcl-2、Bax、Fas及iNos的表达显著高于正常关节软骨中的表达(t=11.75~18.65,P<0.01);大骨节病儿童关节软骨各层Bcl-2、Bax、Fas及iNos表达阳性率有显著性差异(F=73.49~114.42,P<0.01),以表层最多[分别为(41.93±12.26)%、(45.60±15.78)%、(53.60±16.49)%和(45.47±14.02)%],其次为中层[分别为(14.93±3.50)%、(13.87±4.32)%、(23.27±4.83)%、(21.67±6.82)%]。结论 大骨节病患者关节软骨细胞凋亡及相关调控因子Bcl-2、Bax、Fas、iNos表达较正常人显著增多。

Chondrocyte apoptosis and the expression of Bcl-2, Bax, Fasand iNos in articular cartilage in Kashin-Beck disease

Objective To investigate the characteristics of chondrocyte apoptosis and distribution of Bcl-2, Bax, Fas and iNos expressions in articular cartilage in Kashin-Beck disease (KBD). Methods Samples of articular cartilage were collected from 15 healthy children and 15 children with KBD diagnosed according to the Pathological Criteria of KBD Diagnosis in China. Chondrocyte apoptosis was detected by TUNEL method, and the articular chondrocytes positive for Bcl-2, Bax, Fas and iNos were stained by B-SA immunohistochemistry. Results The percentage of apoptotic chondrocytes positively stained by TUNEL in the middle layer of articular cartilage was significantly higher in KBD children than in the control group (33.60%±2.71% vs 1.33%±0.41%, t=11.59, P<0.01). Significant difference in Bcl-2, Bax, Fas and iNos expressions was observed between the upper, middle and deep layers of the articular cartilage of KBD children (F =73.49-114.42, P<0.01), and staining for Bcl-2, Bax, Fas and iNos in KBD children was prominent in the upper layer (41.93%±12.26%, 45.60%±15.78%, 53.60%±16.49%, and 45.47%±14.02%, respectively) and the middle layer (14.93%±3.50%, 13.87%±4.32%, 23.27%±4.83%, and 21.67%±6.82%, respectively) of the articular cartilage; the percentages of chondrocytes positively stained for Bcl-2, Bax, Fas and iNos were significantly higher than those of the control group (t=11.75-18.65, P<0.01). Conclusion The percentages of apoptotic chondrocytes and chondrocytes positive for Bcl-2, Bax, Fas and iNos in the articular cartilage of children with KBD are significantly higher than those in healthy children.