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The apical cell - An enigmatic somatic cell in leech ovaries - Structure and putative functions
Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Surgery. University of Silesia in Katowice, Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, Katowice, Poland.ORCID iD: 0000-0002-4340-7316
University of Silesia in Katowice, Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, Katowice, Poland.ORCID iD: 0000-0001-9410-4510
2021 (English)In: Developmental Biology, ISSN 0012-1606, E-ISSN 1095-564X, Vol. 469, p. 111-124Article in journal (Refereed) Published
Abstract [en]

Although somatic cells play an integral role in animal gametogenesis, their organization and function are usually poorly characterized, especially in non-model systems. One such example is a peculiar cell found in leech ovaries – the apical cell (AC). A single AC can be found at the apical tip of each ovary cord, the functional unit of leech ovaries, where it is surrounded by other somatic and germline cells. The AC is easily distinguished due to its enormous size and its numerous long cytoplasmic projections that penetrate the space between neighboring cells. It is also characterized by a prominent accumulation of mitochondria, Golgi complexes and electron-dense vesicles. ACs are also enriched in cytoskeleton, mainly in form of intermediate filaments. Additionally, the AC is connected to neighboring cells via junctions that structurally resemble hemidesmosomes. In spite of numerous descriptive data about the AC, its functions remain poorly understood. Its suggested functions include a role in forming skeleton for the germline cells, and a role in defining a niche for germline stem cells. The latter is more speculative, since germline stem cells have not been identified in leech ovaries. Somatic cells with similar morphological properties to those of the AC have been found in gonads of nematodes – the distal tip cell – and in insects – Verson’s cell, hub cells and cap cells. In the present article we summarize information about the AC structure and its putative functions. AC is compared with other well-described somatic cells with potentially similar roles in gametogenesis.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 469, p. 111-124
Keywords [en]
Oogenesis, Stem cell niche, Distal tip cell, Verson's cell, Cell-to-cell communication
National Category
Cell and Molecular Biology
Identifiers
URN: urn:nbn:se:umu:diva-178959DOI: 10.1016/j.ydbio.2020.10.004ISI: 000599265000003PubMedID: 33141038Scopus ID: 2-s2.0-85095425107OAI: oai:DiVA.org:umu-178959DiVA, id: diva2:1526117
Available from: 2021-02-05 Created: 2021-02-05 Last updated: 2023-03-24Bibliographically approved

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