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Fine structure of the aggregate silk nodules in the orb-web spider Nephila clavata
Animal Cells and Systems ( IF 2.5 ) Pub Date : 2018-11-02 , DOI: 10.1080/19768354.2018.1546227
Myung-Jin Moon 1
Affiliation  

ABSTRACT Among the triad spinning units for capture thread producing system in the orb-web spiders, aqueous gluey substances are produced from two pairs of aggregate silk glands (ASG). Although biochemical analysis of glue substance is produced by way of their passage through the ASG, its structural modifications in the nodular area have been nearly neglected till now. This paper focused on identifying the fine structural characteristics of the aggregate nodules in the golden orb-web spider Nephila clavata using both of light and transmission electron microscopes. The ASG in N. clavata is composed of a multi-lobed secretory region and a thick excretory duct surrounded by large irregular nodules. Histological analysis of the nodules demonstrates that the nodule forming cells have extensive membrane-bound tubular system that is continuous with the surface membrane. In particular, the nodule forming cells contain numerous mitochondria and glycogen particles within their cytoplasms, and they are surrounded by the same sheath of thin connectives. As previously described, each gluey droplet is formed of a central glycoprotein mass surrounded by an aqueous covering components, the nodular organization in N. clavata indicates that the extensive membrane system is thought to have a function for gluey silk production in spider. The results of this study also strengthen the premise that spider glues are made of glycoproteins, and the aggregate nodule functions as a key component for the spider web glue production.

中文翻译:

球网蜘蛛 Nephila clavata 中聚集丝节的精细结构

摘要 在圆网蜘蛛捕获线生产系统的三重纺纱单元中,水性胶状物质由两对聚合丝腺 (ASG) 产生。虽然胶物质的生化分析是通过它们通过 ASG 产生的,但它在结节区域的结构变化至今几乎被忽视。本文重点研究了使用光学和透射电子显微镜识别金色圆网蜘蛛 Nephila clavata 中聚集结节的精细结构特征。N. clavata 中的 ASG 由多叶分泌区和被大的不规则结节包围的粗排泄管组成。结节的组织学分析表明,结节形成细胞具有与表面膜连续的广泛的膜结合管系统。特别是,结节形成细胞的细胞质中含有大量线粒体和糖原颗粒,并且它们被相同的薄结缔组织鞘包围。如前所述,每个胶状液滴都由被水性覆盖成分包围的中央糖蛋白团形成,N. clavata 中的结节组织表明广泛的膜系统被认为对蜘蛛的胶状丝产生具有功能。这项研究的结果还加强了蜘蛛胶由糖蛋白构成的前提,并且聚集结节是蜘蛛网胶生产的关键成分。结节形成细胞的细胞质内含有大量线粒体和糖原颗粒,它们被相同的薄结缔组织鞘包围。如前所述,每个胶状液滴都由被水性覆盖成分包围的中央糖蛋白团形成,N. clavata 中的结节组织表明广泛的膜系统被认为对蜘蛛中的胶状丝产生具有功能。这项研究的结果还加强了蜘蛛胶由糖蛋白构成的前提,并且聚集结节是蜘蛛网胶生产的关键成分。结节形成细胞的细胞质内含有大量线粒体和糖原颗粒,它们被相同的薄结缔组织鞘包围。如前所述,每个胶状液滴都由被水性覆盖成分包围的中央糖蛋白团形成,N. clavata 中的结节组织表明广泛的膜系统被认为对蜘蛛中的胶状丝产生具有功能。这项研究的结果还加强了蜘蛛胶由糖蛋白构成的前提,并且聚集结节是蜘蛛网胶生产的关键成分。每个胶状液滴都由被水性覆盖成分包围的中心糖蛋白团形成,N. clavata 中的结节组织表明广泛的膜系统被认为对蜘蛛的胶状丝产生具有功能。这项研究的结果还加强了蜘蛛胶由糖蛋白构成的前提,并且聚集结节是蜘蛛网胶生产的关键成分。每个胶状液滴都由被水性覆盖成分包围的中心糖蛋白团形成,N. clavata 中的结节组织表明广泛的膜系统被认为对蜘蛛的胶状丝产生具有功能。这项研究的结果还加强了蜘蛛胶由糖蛋白构成的前提,并且聚集结节是蜘蛛网胶生产的关键成分。
更新日期:2018-11-02
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