RRC ID 57112
著者 Anllo L, Plasschaert LW, Sui J, DiNardo S.
タイトル Live imaging reveals hub cell assembly and compaction dynamics during morphogenesis of the Drosophila testis niche.
ジャーナル Dev Biol
Abstract Adult stem cells are often found in specialized niches, where the constituent cells direct self-renewal of their stem cell pool. The niche is therefore crucial for both normal homeostasis and tissue regeneration. In many mammalian tissues, niche cells have classically been difficult to identify, which has hampered any understanding of how tissues first construct niches during development. Fortunately, the Drosophila germline stem cell (GSC) niche is well defined, allowing for unambiguous identification of both niche cells and resident stem cells. The testis niche first forms in the early embryo, during a late stage of gonadogenesis. Here, using live-imaging both in vivo and ex vivo, we follow pro-niche cells as they assemble and assume their final form. We show that after ex vivo culture the niche appears fully functional, as judged by enrichment of adhesion proteins, the ability to activate STAT in adjacent GSCs, and to direct GSCs to divide orthogonally to the niche, just as they would in situ. Collectively, our imaging has generated several novel insights on niche morphogenesis that could not be inferred from fixed images alone. We identify dynamic processes that constitute an assembly phase and a compaction phase during morphogenesis. The compaction phase correlates with cell neighbor exchange among the assembled pro-niche cells, as well as a burst of divisions among newly recruited stem cells. Before compaction, an assembly phase involves the movement of pro-niche cells along the outer periphery of the gonad, using the extracellular matrix (ECM) to assemble at the anterior of the gonad. Finally, live-imaging in integrin mutants allows us to define the role of pro-niche cell-ECM interaction with regard to the new assembly and compaction dynamics revealed here.
巻・号 446(1)
ページ 102-118
公開日 2019-2-1
DOI 10.1016/j.ydbio.2018.12.014
PII S0012-1606(18)30714-0
PMID 30553808
PMC PMC6410746
MeSH Animals Animals, Genetically Modified Cell Differentiation Drosophila melanogaster / embryology Drosophila melanogaster / genetics Drosophila melanogaster / metabolism Embryo Culture Techniques / methods Germ Cells / metabolism* Luminescent Proteins / genetics Luminescent Proteins / metabolism Male Microscopy, Confocal Morphogenesis Stem Cell Niche* Stem Cells / metabolism* Testis / cytology Testis / embryology Testis / metabolism* Time-Lapse Imaging / methods*
IF 2.936
引用数 1
リソース情報
ショウジョウバエ DGRC#110692 DGRC#110807