南方医科大学学报

南方医科大学学报 ›› 2014, Vol. 34 ›› Issue (12): 1785-.

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大骨节病与骨关节病软骨组织死亡相关因子表达的比较

武世勋，郭雄，张峰，郑晶晶，张增铁   

  • 出版日期:2014-12-20 发布日期:2014-12-20

Comparison of the expression profiles of cell death factors in articular cartilage between
Kashin-Beck disease and osteoarthritis

  • Online:2014-12-20 Published:2014-12-20

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摘要： 目的观察大骨节病软骨组织中程序化细胞死亡分子5（programmed cell death 5, PDCD5）和早期生长反应蛋白1（early
growth response protein-1, EGR-1）表达的变化及其在大骨节病软骨损伤中的作用。方法收集来自大骨节病患者关节软骨（KBD
组）10例，同时收集15例骨关节炎病人关节软骨（OA组）作为疾病对照，收集6例正常软骨作为健康对照（正常组）。采用免疫组化
染色法检测3组关节软骨组织中死亡受体调节因子PDCD5和EGR-1表达变化，并在显微镜下计数和分析3组关节软骨不同分层
间阳性表达率的显著性差异。结果（1）KBD软骨中层PDCD5阳性细胞表达率（41.35±2.97）%显著高于OA组（26.48±2.04）%和
正常组（19.02±1.88）%（P=0.001和P=0.000），KBD软骨深层显著高于正常组和OA组（P=0.000和P=0.029），OA组也高于正常组
（P=0.038），而3组间的表层软骨细胞PDCD5阳性率无差异（P>0.05）；（2）在KBD软骨表层，EGR-1表达显著高于OA软骨和正常
软骨表层（P=0.000和P=0.000），3组软骨的阳性表达率分别为（27.94±3.09）%、（3.20±1.49）%和（12.66±1.06）%，KBD软骨中层
EGR-1阳性细胞表达率显著低于OA组软骨（P=0.002），而高于正常软骨（P=0.017），KBD软骨和OA软骨深层阳性率均明显高于
正常组（P=0.000和P=0.001），而KBD组和OA组的平均阳性率无统计学差异（P=0.187）；（3）KBD组与正常组的PDCD5和EGR-1
分别在3个软骨细胞层的表达均无相关性，而PDCD5和EGR-1在OA关节软骨表层呈强正相关。结论KBD软骨深层PDCD5显
著上调，而软骨表层和深层EGR-1显著高表达，提示这两种重要的细胞死亡相关因子在大骨节病软骨破坏过程中发挥重要作用。

Abstract: Objective To compare the expressions of programmed cell death 5 (PDCD5) and early growth response protein-1
(EGR-1) in the articular cartilage between Kashin-Beck disease (KBD) and primary osteoarthritis and the roles of these factors
in KBD cartilage. Methods Cartilage specimens were collected from 10 confirmed KBD patients, 15 osteoarthritic patients and
6 healthy subjects. The expression levels of PDCD5 and EGR-1 in the cartilage were detected by immunohistochemistry
staining, and the positive chondrocyte counts were recorded in the different layers of KBD and OA cartilages. Results The
KBD cartilages contained a significantly higher percentage of PDCD5-positive chondrocytes in the middle layer [(41.35 ±
2.97)%] than OA cartilages [(26.48±2.04)%, P=0.001] and normal cartilages [(19.02±1.88)%, P=0.000] with also obvious PDCD5
over-expression in the deeper layer compared to OA (P=0.000) and normal cartilages (P=0.029), but PDCD5 expression in the
superficial layer of the cartilages showed no significant difference among the 3 groups(P>0.05). The average EGR-1 positivity
rate in the superficial layer of the cartilage was significantly higher in KBD patients than in OA patients (P=0.000) and healthy
controls (P=0.000), but in the middle layer, its positivity rate in KBD patients was higher than that in the normal control (P=
0.017) but lower than that of OA cartilage (P=0.002); EGR-1 expression in the deeper layer was comparable in KBD and OA
cartilages but both was higher than that in normal cartilages. PDCD5 and EGR-1 expressions were not correlated in either KBD
or normal cartilages, but were positively correlated in the superficial layer of OA cartilages. Conclusions KBD cartilages show
a significantly increased PDCD5 expression in the deeper layer and enhanced EGR-1 expression in both superficial and deeper
layers, suggesting the involvement of PDCD5 and EGR-1 in the pathogenesis of KBD.