纤毛
轴丝
软骨细胞
超微结构
细胞外基质
细胞生物学
软骨
电子断层摄影术
解剖
生物物理学
共焦
化学
生物
电子显微镜
光学
生物化学
物理
鞭毛
扫描透射电子显微镜
基因
作者
Cynthia G. Jensen,CA Poole,Susan R. McGlashan,Michael Marko,Z.I. Issa,K.V. Vujcich,Samuel S. Bowser
标识
DOI:10.1016/j.cellbi.2003.11.007
摘要
Hyaline cartilage chondrocytes express one primary cilium per cell, but its function remains unknown. We examined the ultrastructure of chick embryo sternal chondrocyte cilia and their interaction with extracellular matrix molecules by transmission electron microscopy (TEM) and, for the first time, double-tilt electron tomography. Ciliary bending was also examined by confocal immunohistochemistry. Tomography and TEM showed the ciliary axoneme to interdigitate amongst collagen fibres and condensed proteoglycans. TEM also revealed the presence of electron-opaque particles in the proximal axoneme which may represent intraciliary-transport (ICT) particles. We observed a wide range of ciliary bending patterns. Some conformed to a heavy elastica model associated with shear stress. Others were acutely deformed, suggesting ciliary deflection by collagen fibres and proteoglycans with which the cilia make contact. We conclude that mechanical forces transmitted through these matrix macromolecules bend the primary cilium, identifying it as a potential mechanosensor involved in skeletal patterning and growth.
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