Secrets of a marine worm's regenerative energy revealed | EUROtoday

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VSIt is a superpower that fascinates scientists. Some animals are in a position to regenerate a number of elements of their physique when it’s amputated. If mammals – together with people – can regenerate their liver or some arthropods and vertebrates reform advanced buildings, equivalent to legs or fins, Flatworms (or platyhelminthes) are able to reconstructing a whole particular person from a really small physique fragment.

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It should be mentioned that worms are fairly gifted at this recreation. The scientific staff led by Eve Gazave, analysis director on the Jacques-Monod Institute (CNRS/Université Paris-Cité) is finding out a marine worm known as Platynereis dumeriliia species with a segmented physique, near the earthworms that we see in our gardens.

“This worm is of particular interest to us because it has several extremely complex parts of its body that regenerate efficiently – its posterior part, which contains a precious ring of stem cells that allow it to constantly grow from the rear, as well as its locomotive appendages called parapodia – and a part – the anterior part of its body – that does not regenerate well. Thanks to it, we hope to understand why some species have very good regenerative capacities and others do not,” the biologist explains. To obtain this, the scientists got down to determine the cells and mechanisms concerned on this phenomenon.

Stem cell ring

“Given that the worm manages to regenerate its posterior part when it is amputated, including the ring of stem cells that allow it to lengthen throughout its life, we already knew that regeneration could not be achieved using the latter. It therefore uses other mechanisms that are so powerful that they allow it to produce not only differentiated muscle, epidermis or intestinal cells, but also stem cells capable of producing several different cell types,” emphasizes Eve Gazave.

His staff subsequently determined to have a look at the intestinal cells of Platynereis dumeriliiTo do that, the researchers used fluorescent beads that they fed to their worms and which, when ingested by the animals, had been positioned particularly within the intestinal epithelium. The purpose was to watch the habits of those intestinal cells throughout regeneration experiments.

A query of place

But what they found in doing so just isn’t trivial. Not solely do the worm's intestinal cells take part within the regeneration of the gut, however additionally they contribute to that of different tissues, equivalent to muscle groups or the dermis. Even extra astonishing, the researchers discovered that the regenerative capacities of the intestinal cells range markedly relying on their location: the nearer they’re to the posterior finish of the worm, the higher their capacities and the higher the number of cell varieties that they assist to regenerate.

“We even identified that the majority of cells involved in the regeneration of the posterior structure came from a very small part of the worm, the segment located just before the amputation site,” the researcher explains. Is this as a result of the cells situated behind the worm, resulting from its steady development, are additionally the youngest? This is likely one of the questions the staff should attempt to reply. But it additionally plans to work on figuring out whether or not different cell varieties are additionally liable for the astonishing powers of this worm. Fundamental analysis, actually, however which might effectively be of essential curiosity for regenerative medication.


https://www.lepoint.fr/science/les-secrets-du-pouvoir-de-regeneration-d-un-ver-marin-devoiles-06-07-2024-2564956_25.php