Contractility of the roots of flagella and cilia
Contractility of the roots of flagella and cilia
复制标题
鞭毛和纤毛根部的收缩性
作者：
M. Sleigh
纤毛和鞭毛的基体上有很高比例的纹状根和/或微管纤维束。在没有明确证据表明有任何其他功能的情况下，人们一直认为这些附着的纤维结构的目的是为睫状体基底提供牢固的锚定，从而可以充分利用睫状体干的推进活动。然而，大的条纹根不存在。不仅在机械活性纤毛和鞭毛上，而且在诸如脊椎动物视网膜的视杆细胞中的感觉纤毛上，其中纤毛基部的锚定似乎不需要如此大的根部结构。Salisbury和弗洛伊德最近的报告（Science 202，975; 1978）指出，藻类鞭毛扁藻鞭毛的条纹状根经历了钙诱导的收缩，这应该引起对这些结构的进一步研究。
Ahigh proportion of the basal bodies of cilia and flagella bear striated roots and/or bundles of microtubular fibrils. In the absence of clear evidence for any other function it has been assumed that the purpose of these attached fibrous structures is to provide a firm anchorage for the ciliary base, so that the propulsive activity of the ciliary shaft can be exploited to the full. However, large striated roots are present not. only on mechanically active cilia and flagella, but also on such sensory cilia as those in the rod cells of the vertebrate retina, where anchorage of the ciliary base would not seem to require such a large root structure. The recent report by Salisbury and Floyd (Science 202, 975; 1978) that the striated roots of flagella of the algal flagellate Platymonas undergo a calcium-induced contraction should provoke further investigation of these structures.