The ventral epithelium of Trichoplax adhaerens deploys in distinct patterns cells that secrete digestive enzymes, mucus or diverse neuropeptides

Biology Open
Tatiana D MayorovaCarolyn L Smith

Abstract

The disk-shaped millimeter-sized marine animal, Trichoplax adhaerens, is notable because of its small number of cell types and primitive mode of feeding. It glides on substrates propelled by beating cilia on its lower surface and periodically pauses to feed on underlying microorganisms, which it digests externally. Here, a combination of advanced electron and light microscopic techniques are used to take a closer look at its secretory cell types and their roles in locomotion and feeding. We identify digestive enzymes in lipophils, a cell type implicated in external digestion and distributed uniformly throughout the ventral epithelium except for a narrow zone near its edge. We find three morphologically distinct types of gland cell. The most prevalent contains and secretes mucus, which is shown to be involved in adhesion and gliding. Half of the mucocytes are arrayed in a tight row around the edge of the ventral epithelium while the rest are scattered further inside, in the region containing lipophils. The secretory granules in mucocytes at the edge label with an antibody against a neuropeptide that was reported to arrest ciliary beating during feeding. A second type of gland cell is arrayed in a narrow row just inside the row o...Continue Reading

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Citations

Jul 5, 2019·Cell and Tissue Research·Carolyn L Smith, Tatiana D Mayorova
Feb 9, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Leonid L MorozAndrea B Kohn
Mar 9, 2021·Frontiers in Cell and Developmental Biology·Cynthia Arroyo PortillaHugues Lelouard
Apr 21, 2021·Cell and Tissue Research·Daria Y RomanovaLeonid L Moroz
May 11, 2020·Mechanisms of Development·Jorge Zuccolotto-Arellano, Rodrigo Cuervo-González

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Methods Mentioned

BETA
scanning electron microscopy
confocal microscopy
fluorescence microscopy

Software Mentioned

Fiji
ATLAS
Volocity
Zen
PAST

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