实验性氟中毒鸡胚股骨形态学观察及骨组织计量学研究

THE MORPHOLOGICAL OBSERVATIONS AND BONE HISTOMOPHOMETRIC STUDY OF THE CHICKEN EMBRYO FEMUR IN EXPERIMENTAL FLUOROSIS

本文对实验性氟中毒鸡胚股骨进行了光镜、电镜观察及骨组织计量学研究。结果表明,实验组股骨骨小梁表面成骨细胞密集分布,多为立方状。矿化骨减少,类骨质增加。骨形成指数大于对照组,骨吸收指数无显著性变化。实验组类骨质中Ⅰ型胶原纤维明暗相间的横纹不清,胶原肿胀,板层结构紊乱。以上结果提示,氟对胚胎成骨细胞有刺激作用,成骨作用加强,但成骨细胞产生异常的胶原纤维,类骨质矿化障碍,出现骨软化。

The femur of chicken embryo in experimental fluorosis was observed under light and electron microscope, and studied by bone histomorphometric method. The results showed that most of osteoblasts were cuboid and crowded together on the surface of bone trabecula in experimental group. The osteoid was increased and mineralized bone was diminished. The bone reformation indexes were higher significantly and the bone resorption indexes did not show differences between the two groups. The cross striations of type Ⅰ collagen fibrils in osteoid layers of experimental group were indistinct and bone lamella were jumble array. Our results suggest that though fluoride has a stimulating action on the embryonic osteoblasts and enhanced the bone formation, the osteoblasts produced abnormal collagen fibrils which caused disorder of osteoid mineralization and led to osteomalacia.