TGF—β诱导骺板肥大区软骨细胞向成骨样细胞分化

目的 通过研究转化生长因子－β（TGF－β）对骺板软骨细胞分化的作用，揭示TGF－β软骨内成骨的作用机制。方法 采用鸡胚股骨无血清培养、酶组化检测碱性磷酸酶（ALP）、免疫组化检测Ⅰ型胶原、纤维粘连蛋白（FN）等方法，观察TGF－β在不同作用时间和剂量时对骺板肥大区软骨细胞分化的作用。结果 TGF－β可使肥大区软骨细胞表达Ⅰ型胶原和FN，使ALP表达增加，并存在着量效和时效关系。结论 TGF－β可以诱导鸡胚股骨骺板肥大区软骨细胞向成骨样细胞分化，与TGF－β的作用剂量和时间密切相关。

Transforming growth factor-beta can induce differentiation of hypertrophic chondrocytes into osteoblast-like cells in epiphyseal plate]

OBJECTIVE: To investigate the effect of transforming growth factor-beta (TGF-beta) on the differentiation of hypertrophic chondrocytes in epiphyseal plate in order to understand its role in the mechanism of bone and cartilage formation. METHODS: We observed the effect of TGF-beta in varied time and dosage on the differentiation of hypertrophic chondrocytes in embryonic chick femora which were cultured in serum-free medium, using histochemical staining to detect the expression of alkaline phosphatase (ALP) and immunohistochemical staining to detect the expression of type I collagen and fibronectin. RESULTS: TGF-beta enabled the chondrocytes to express type I collagen and fibronectin, and it enhanced the expression of ALP in hypertrophic zone. Time-effect and dosage-effect relationships were observed. CONCLUSION: TGF-beta can induce the differentiation of hypertrophic chondrocytes into osteoblast-like cells in epiphyseal plate of embryonic chick femora. The inducing effect might be closely related to time and dosage of TGF-beta.