维甲酸和甲状腺激素在骨髓间充质干细胞软骨分化中的作用  

Role of retinoic acid and thyroid hormone in chondrogenic differentiation of bone marrow mesenchymal stem cells

作　　者：尹宏宇 魏华[2] 刘瑾春 Yin Hongyu;Wei Hua;Liu Jinchun(Department of Plastic Surgery,Beijing Shijitan Hospital,Capital Medical University,Beijing 100038,China;Department of Clinic Medicine,Henan Vocational College of Nursing,Anyang 455000,Henan Province,China)

机构地区：[1]首都医科大学附属北京世纪坛医院整形美容外科,北京100038 [2]河南护理职业学院临床医学系,河南安阳455000

出　　处：《首都医科大学学报》2023年第2期258-264,共7页Journal of Capital Medical University

摘　　要：目的 探讨甲状腺素(thyroxine,T3)和维甲酸(retinoic acid,RA)对骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs)软骨形成的影响。方法 在3种条件培养基中培养和诱导猪BMSCs成软骨分化:对照组使用软骨生成培养基(含10-7mol/L地塞米松和10 ng/mL转化生长因子β1),RA组采用软骨生成培养基加1μmol/L RA,T3组采用软骨生成培养基加100 nmol/L T3。采用MTT法单层检测BMSCs的增殖情况。收获第3代BMSCs,离心形成细胞颗粒,分为3组分别进行软骨细胞诱导。4周后采集3组的细胞颗粒,通过组织学染色和半定量基因表达分析进行软骨形成评估。结果 T3组BMSCs增殖高于对照组(P<0.05);RA组BMSCs增殖低于对照组(P<0.05);对照组BMSCs颗粒中观察到软骨特征的类腔隙结构和甲苯胺蓝阳性染色,RA组未见;RA组软骨发生标志基因ColⅡ、蛋白聚糖(aggrecan)和Sox9的表达与对照组相比显著降低,而肥大标志基因ColX的表达在RA组显著增加,成骨相关基因ColⅠ和Runx2的表达也明显降低,差异有统计学意义(P<0.05);T3组ColⅡ、aggrecan和Sox9的表达显著增加,Col X的表达也显著增加,差异有统计学意义(P<0.05),2组间ColⅠ和Runx2表达,差异无统计学意义(P>0.05)。结论 RA可抑制BMSCs的增殖和软骨形成,T3可促进BMSCs的增殖和软骨形成,但可诱导软骨细胞肥大。Objective To investigate the effects of thyroxine(T3)and retinoic acid(RA)on chondrogenesis of bone marrow mesenchymal stem cells(BMSCs).Methods Porcine BMSCs were cultured and induced in three conditioned medium:control group was treated chondrogenic medium[with 10-7 mol/L dexamethasone and 10 ng/mL transforming growth factor-β1(TGF-β1)].RA group was treated chondrogenic medium plus 1μmol/L RA.T3 group was treated chondrogenic medium plus 100 nmol/L T3.BMSCs proliferation was evaluated by MTT assay in a monolayer way.BMSCs pellets in the two groups were harvested after 4 weeks and were evaluated with histological staining and semi-quantitative gene expression analysis.Results BMSCs proliferation in T3 group was significantly higher than that of control group(P<0.05).BMSCs proliferation in RA group was significantly lower than that of control group(P<0.05).Lacuna-like structure and positive staining of toluidine blue were observed in BMSCs pellets of control group but not in RA group.Better lacuna like structure and positive staining of toluidine blue were observed in BMSCs pellets of T3 group.Expressions of marker genes of chondrogenesis,such as ColⅡ,aggrecan and Sox 9,were significantly decreased in RA group compared with control group at week 4,while expression of Col X,a marker gene of hypertrophy,was significantly increased in RA group.The expressions of osteogenesis-related genes ColⅠand Runx 2 also decreased markedly(P<0.05).Expressions of ColⅡ,aggrecan and Sox9 were significantly increased in T3 group compared with control group at week 4,and expression of Col X was significantly increased in T3 group(P<0.05).There was no significant difference in the gene expressions of ColⅠand Runx2 between the two groups(P>0.05).Conclusion RA inhibited proliferation and chondrogensis of BMSCs.T3 promoted the proliferation and chondrogenesis of BMSCs,but induced the hypertrophy of chondrocytes differentiated from BMSCs.

关 键 词：维甲酸 甲状腺素 软骨形成 骨髓间充质干细胞 软骨内成骨 

分 类 号：R62[医药卫生—整形外科]