牛牙骨质来源细胞的分离、培养和鉴定

目的 探索体外分离培养牙骨质来源细胞（cementum-derived cells,CDC)的方法，并研究其生物学特性。方法 用组织法联合酶消化法，分离培养新生牛牙根表面的细胞；免疫细胞化学方法检测CDC中与骨相关的标志物如骨钙素、碱性磷酸酶和特异性牙骨质附着蛋白的表达；改良钙钴法检测碱性磷酸酶的活性。结果 培养增殖的细胞具有成牙骨质细胞的形态特征，经5次传代后细胞形态无明显改变；该细胞骨钙素、碱性磷酸酶免疫细胞化学染色均为阳性，并有碱性磷酸酶活性表达；牙骨质附着蛋白呈阳性着色。结论 初步确定本实验首次成功分离培养了牛牙骨质来源的、具成牙骨质细胞特性的成牙骨质细胞。为进一步研究成牙骨质细胞的生物学特性及牙骨质生成和修复提供了条件。

Isolation, culture and identification of bovine cementum-derived cells

OBJECTIVE: To isolate and culture bovine cementum-derived cells and investigate their biological properties. METHODS: Culture of primary bovine cementoblast (CB) were established from new-born bovine teeth. Cementum was manually dissected, fragmented, and digested twice with collagenase. Following a thorough wash to remove liberated cells, the remaining cementum fragments were plated and cultured in RPMI1640 containing 10% FCS and 1.5% Hepes. The cells in culture were identified using immunocytochemistry by expression of cementum attachment protein (CAP), osteocalcin (OCN) and alkaline phosphatase (ALP). ALP activity was measured by modified Gomori staining. RESULTS: (1) The cells in culture possessed the typical morphology of CB and there were no obvious change of the cell morphology up to 5th passage; (2) Cells in culture exhibited alkaline phosphatase activity and were also positive to CAP, OPN and ALP immunohistochemistry staining. CONCLUSION: The cells isolated and cultured in this experiment possess the properties of CB. This enables us to further observe its biological characteristics during cementogenesis and periodontal regeneration.