Journal of Capital Medical University ›› 2023, Vol. 44 ›› Issue (2): 258-264.doi: 10.3969/j.issn.1006-7795.2023.02.012

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

Yin Hongyu1 ,  Wei Hua2,   Liu Jinchun2*   

  1. 1. Department of Plastic Surgery, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, China;    2. Department of Clinic Medicine, Henan Vocational College of Nursing, Anyang 455000, Henan Province, China
  • Received:2022-10-28 Online:2023-04-21 Published:2023-04-18

Abstract: 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 1 μmol/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 Col Ⅱ, 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 Col Ⅰ and Runx 2 also decreased markedly (P<0.05). Expressions of Col Ⅱ, 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 Col Ⅰ and 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. 

Key words: retinoic acid, thyroid,  , chondrogenesis, bone marrow mesenchymal stem cells, endochondral bone formation

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