Micro- and nanostructure of the adhesive material secreted by the tube feet of the sea star Asterias rubens
Micro- and nanostructure of the adhesive material secreted by the tube feet of the sea star Asterias rubens
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DOI：
10.1016/j.jsb.2008.06.007
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发表时间：
2008-10-01
影响因子：
3
通讯作者：
Flammang, Patrick
中科院分区：
文献类型：
--
作者：
Hennebert, Elise;Viville, Pascal;Flammang, Patrick
为了附着在水下表面，海星依靠特殊器官管足产生的粘性分泌物。粘连是暂时的，管脚也可以自愿脱离。管足盘表皮的两种粘附性分泌细胞产生粘附物质，并沉积在盘表面和基质之间。分离后，这种材料作为足迹保留在底层上。利用光学显微镜、扫描电镜和原子力显微镜对红海星个体在不同基底上留下的足迹进行了精细结构的观察。用透射电镜观察了附着管脚粘附层的超微结构。无论使用何种方法，粘合剂材料都表现为由球形纳米结构组成，形成沉积在薄的均匀膜上的网状结构。这种外观并没有根据脚印是否固定而有所不同，也没有根据脚印是否干燥而有所不同。TEM观察表明，2型粘附细胞将负责释放构成均匀膜的材料，而1型粘附细胞将产生形成网状物的材料。这种网状结构可能来源于盘表面粘附细胞分泌孔的排列。(c)2008年爱思唯尔公司All rights reserved.
To attach to underwater surfaces, sea stars rely on adhesive secretions produced by specialised organs, the tube feet. Adhesion is temporary and tube feet can also voluntarily become detached. The adhesive material is produced by two types of adhesive secretory cells located in the epidermis of the tube foot disc, and is deposited between the disc surface and the substratum. After detachment, this material remains on the substratum as a footprint. Using LM, SEM, and AFM, we described the fine structure of footprints deposited on various substrata by individuals of Asterias rubens. Ultrastructure of adhesive layer of attached tube feet was also investigated using TEM. Whatever the method used, the adhesive material appeared as made up of globular nanostructures forming a meshwork deposited on a thin homogeneous film. This appearance did not differ according to whether the footprints were fixed or not, and whether they were observed hydrated or dry. TEM observations suggest that type 2 adhesive cells would be responsible for the release of the material constituting the homogeneous film whereas type 1 adhesive cells would produce the material forming the meshwork. This reticulated pattern would originate from the arrangement of the adhesive cell secretory pores on the disc surface. (c) 2008 Elsevier Inc. All rights reserved.