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Article Dans Une Revue Royal Society Open Science Année : 2023

Interaction of the mechanosensitive microswimmer Paramecium with obstacles

Nicolas Escoubet
Romain Brette
Lea-Laetitia Pontani
Alexis Michel Prevost

Résumé

In this work, we report investigations of the swimming behaviour of Paramecium tetraurelia , a unicellular microorganism, in micro-engineered pools that are decorated with thousands of cylindrical pillars. Two types of contact interactions are measured, either passive scattering of Paramecium along the obstacle or avoiding reactions (ARs), characterized by an initial backward swimming upon contact, followed by a reorientation before resuming forward motion. We find that ARs are only mechanically triggered approximately 10% of the time. In addition, we observe that only a third of all ARs triggered by contact are instantaneous while two-thirds are delayed by approximately 150 ms. These measurements are consistent with a simple electrophysiological model of mechanotransduction composed of a strong transient current followed by a persistent one upon prolonged contact. This is in apparent contrast with previous electrophysiological measurements where immobilized cells were stimulated with thin probes, which showed instantaneous behavioural responses and no persistent current. Our findings highlight the importance of ecologically relevant approaches to unravel the motility of mechanosensitive microorganisms in complex environments.
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Dates et versions

hal-04237413 , version 1 (07-11-2023)

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Nicolas Escoubet, Romain Brette, Lea-Laetitia Pontani, Alexis Michel Prevost. Interaction of the mechanosensitive microswimmer Paramecium with obstacles. Royal Society Open Science, 2023, 10 (5), ⟨10.1098/rsos.221645⟩. ⟨hal-04237413⟩
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