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Parapodial glandular organs in Owenia borealis (Annelida: Oweniidae) and their possible relationship with nephridia.
Journal of Experimental Zoology-B: Molecular and Developmental Evolution ( IF 2.2 ) Pub Date : 2020-01-30 , DOI: 10.1002/jez.b.22928
Nadezda Rimskaya-Korsakova 1 , Vyacheslav Dyachuk 2 , Elena Temereva 1, 3
Affiliation  

Oweniidae is a basal group of recent annelids and nowadays it attracts the attention of researchers of many biological fields. Surprisingly, details of their anatomy, like the adult excretory system, remain obscure. Researchers recently suggested that the paired organs of tubeworms in the family Oweniidae are related to nephridia. In the current study of Owenia borealis adults, we determined that these structures are parapodial glandular organs (PGOs) and are located in the first two segments of adults. The PGOs are complex subepidermal multicellular glands that contain secretory cells, that is, goblet cells, which are differentiated by the type of the producing tube matter. The goblet cells are surrounded by muscles that are used to extrude material stored in the PGO's lumen into the external environment. The anterior pair of PGOs have very well-developed rough endoplasmatic reticulum in the proximal cells, spacious Golgi complexes, numerous nail-shaped microvilli, and apocrine secretory processes in the goblet cells of the distal parts. The posterior pair of PGOs only consists of cells, which probably produce proteinaceous fibrils. We discuss the homology of goblet cells with specific nail-shaped microvilli that produce β-chitin within annelids. We also discuss the possibility that PGOs and nephridia have a common origin. This study provides new information on the ultrastructure of cells that secrete the organic material used to form the tubes inhabited by tube-dwelling annelids.

中文翻译:

欧文氏虫(Annelida:Oweniidae)的足旁腺器官及其与肾病的可能关系。

Oweniidae是近来的无脊椎动物的基础群体,如今它吸引了许多生物学领域的研究人员的注意。令人惊讶的是,它们的解剖结构(如成人排泄系统)仍然不清楚。研究人员最近建议,在Oweniidae家族中,结节虫的配对器官与肾病有关。在目前对欧文氏虫成虫的研究中,我们确定这些结构是足突腺器官(PGOs),位于成虫的前两个部分。PGO是复杂的表皮下多细胞腺体,其包含分泌细胞,即杯状细胞,其通过生产管物质的类型来区分。杯状细胞周围有肌肉,这些肌肉用于将存储在PGO内腔中的物质挤出到外部环境中。前一对PGO在近端细胞中具有非常发达的粗糙内质网,宽敞的高尔基体,大量的钉状微绒毛和远端杯状细胞中的顶泌分泌过程。后对PGO仅由细胞组成,可能会产生蛋白质原纤维。我们讨论了杯状细胞与特定的钉状微绒毛的同源性,这些绒毛在肛门内产生β-甲壳质。我们还讨论了PGO和肾病有共同起源的可能性。这项研究提供了有关细胞超微结构的新信息,这些超微结构分泌了有机材料,这些有机材料用于形成被管类动物居住的管类。末梢杯状细胞中的顶泌分泌过程。后对PGO仅由细胞组成,可能会产生蛋白质原纤维。我们讨论了杯状细胞与特定的钉状微绒毛的同源性,这些绒毛在肛门内产生β-甲壳质。我们还讨论了PGO和肾病有共同起源的可能性。这项研究提供了有关细胞超微结构的新信息,这些超微结构分泌了有机材料,这些有机材料用于形成被管类动物居住的管类。末梢杯状细胞中的顶泌分泌过程。后对PGO仅由细胞组成,可能会产生蛋白质原纤维。我们讨论了杯状细胞与特定的钉状微绒毛的同源性,这些绒毛在肛门内产生β-甲壳质。我们还讨论了PGO和肾病有共同起源的可能性。这项研究提供了有关细胞超微结构的新信息,这些超微结构分泌了有机材料,这些有机材料用于形成由居住在管中的类管动物居住的管。
更新日期:2020-04-14
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