Ndiaye Papa Ibnou, Miquel Jordi, Bâ Cheikh Tidiane, Marchand Bernard
Laboratori de Parasitologia, Departament de Microbiologia i Parasitologia Sanitàries, Facultat de Farmàcia, Universitat de Barcelona, Av. Joan XXIII, sn, E-08028 Barcelona, Spain.
J Parasitol. 2004 Feb;90(1):30-40. doi: 10.1645/GE-3171.
The present paper describes the spermiogenesis and the ultrastructure of the spermatozoon of Fasciola gigantica, as revealed by transmission electron microscopy. Spermiogenesis in F. gigantica begins with the formation of a differentiation zone containing 2 centrioles with associated striated roots and an intercentriolar body between them. Each centriole develops a flagellum. Proximodistal fusion of these flagella with the median cytoplasmic extension gives rise to the spermatozoon. Spermiogenesis in F. gigantica is characterized by the formation of a dorsolateral cytoplasmic expansion, an external ornamentation of the cell membrane, and spinelike bodies. These 3 structures were also observed in the anterior part of the spermatozoon. Our study describes for the first time the simultaneous presence of dorsolateral cytoplasmic expansion, external ornamentation of the plasma membrane, and spinelike bodies in the spermatozoon of a trematode.
本文描述了通过透射电子显微镜揭示的巨片形吸虫精子发生过程及精子的超微结构。巨片形吸虫的精子发生始于一个分化区的形成，该分化区包含两个带有相关横纹根的中心粒以及它们之间的中心粒间体。每个中心粒长出一根鞭毛。这些鞭毛与中间的细胞质延伸部进行近远端融合，从而产生精子。巨片形吸虫的精子发生的特征在于背外侧细胞质扩张、细胞膜的外部装饰以及刺状体的形成。在精子的前部也观察到了这三种结构。我们的研究首次描述了吸虫精子中同时存在背外侧细胞质扩张、质膜的外部装饰和刺状体。
