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Cell death and renewal during prey capture and digestion in the carnivorous sponge Asbestopluma hypogea (Porifera: Poecilosclerida)

Abstract : The sponge Asbestopluma hypogea is unusual among sponges due to its peculiar carnivorous feeding habit. During various stages of its nutrition cycle, the sponge is subjected to spectacular morphological modifications. Starved animals are characterized by many elongated filaments, which are crucial for the capture of prey. After capture, and during the digestion process, these filaments actively regress before being regenerated during a subsequent period of starvation. Here, we demonstrate that these morphological events rely on a highly dynamic cellular turnover, implying a coordinated sequence of programmed cell death (apoptosis and autophagy), cell proliferation and cell migration. A candidate niche for cell renewal by stem cell proliferation and differentiation was identified at the base of the sponge peduncle, characterized by higher levels of BrdU/EdU incorporation. Therefore, BrdU/EdU-positive cells of the peduncle base are candidate motile cells responsible for the regeneration of the prey-capturing main sponge body, i.e. the dynamic filaments. Altogether, our results demonstrate that dynamics of cell renewal in sponge appear to be regulated by cellular mechanisms as multiple and complex as those already identified in bilaterian metazoans.
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https://hal.umontpellier.fr/hal-01878493
Contributeur : Camille Martinand-Mari Connectez-vous pour contacter le contributeur
Soumis le : vendredi 4 juin 2021 - 11:40:58
Dernière modification le : jeudi 19 mai 2022 - 15:45:40
Archivage à long terme le : : dimanche 5 septembre 2021 - 19:01:55

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C. Martinand-Mari, J. Vacelet, M. Nickel, G. Worheide, P. Mangeat, et al.. Cell death and renewal during prey capture and digestion in the carnivorous sponge Asbestopluma hypogea (Porifera: Poecilosclerida). Journal of Experimental Biology, The Company of Biologists, 2012, 215 (22), pp.3937-3943. ⟨10.1242/jeb.072371⟩. ⟨hal-01878493⟩

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