Cilia-like structures anchor the amphioxus notochord to its sheath
Cilia-like structures anchor the amphioxus notochord to its sheath
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DOI：
10.1016/j.acthis.2009.08.002
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发表时间：
2011-01-01
影响因子：
2.5
通讯作者：
Saraga-Babic, Mirna
中科院分区：
文献类型：
--
作者：
Bocina, Ivana;Ljubesic, Nikola;Saraga-Babic, Mirna
在鱼的波动运动中，身体僵硬是很重要的。在文昌鱼中，肌梭在肌力向脊索的传递中起着重要的作用。为了明确文昌鱼运动过程中脊索的具体支持作用，用透射电子显微镜对10个文昌鱼成年标本的超微结构进行了分析。在脊索细胞附着于脊索鞘的部位，每个脊索细胞表面均可见大量纤毛样结构。在超微结构上，这些结构由周围和中央的微管双重体组成，并锚定在脊索鞘的内层。免疫组织化学显示纤毛样结构区域对动力蛋白和β-微管蛋白抗体呈阳性反应。我们认为，纤毛状结构的来回运动减少可能有助于脊索内液体的流动，从而调节文昌鱼身体在波动运动中的硬度。(C)2009年爱思唯尔股份有限公司。版权所有。
Body stiffness is important during undulatory locomotion in fish. In amphioxus, the myosepta play an important role in transmission of muscular forces to the notochord. In order to define the specific supporting role of the notochord in amphioxus during locomotion, the ultrastructure of 10 adult amphioxus specimens was analyzed using transmission electron microscopy. Numerous cilia-like structures were found on the surface of each notochordal cell at the sites of their attachment to the notochordal sheath. Ultrastructurally, these structures consisted of the characteristic arrangement of peripheral and central microtubular doublets and were anchored to the inner layer of the notochordal sheath. Immunohistochemically, a positive reaction to applied dynein and beta-tubulin antibodies characterized the area of the cilia-like structures. We propose that reduced back-and-forth movements of the cilia-like structures might contribute to the flow of the fluid content inside the notochord, thus modulating the stiffness of the amphioxus body during its undulatory locomotion. (C) 2009 Elsevier GmbH. All rights reserved.