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Exopolysaccharides protect Synechocystis against the deleterious effects of Titanium dioxide nanoparticles in natural and artificial waters

Mariane Planchon 1, 2 Thichakorn Jittawuttipoka 3 Corinne Cassier-Chauvat 3 François Guyot 4 Alexandre Gelabert 5 Marc. Benedetti 2 Franck Chauvat 3, 1 Olivier Spalla 1
1 SIS2M UMR 3299 - Service Interdisciplinaire sur les Systèmes Moléculaires et les Matériaux (ex SCM)
2 IPGP - Institut de Physique du Globe de Paris
3 CEA Saclay, DSV IBITEC S SB2SM, UMR 8221, F-91191 Gif Sur Yvette, France
4 LMCP - Laboratoire de minéralogie, cristallographie de Paris
5 IPGP - Institut de Physique du Globe de Paris
Abstract : We have studied the effect of TiO2 nanoparticles (NPs) on the model cyanobacteria Synechocystis PCC6803. We used well-characterized NPs suspensions in artificial and natural (Seine River, France) waters. We report that NPs trigger direct (cell killing) and indirect (cell sedimentation precluding the capture of light, which is crucial to photosynthesis) deleterious effects. Both toxic effects increase with NPs concentration and are exacerbated by the presence of UVAs that increase the production of Reactive Oxygen Species (hydroxyl and superoxide radicals) by TiO2 NPs. Furthermore, we compared the responses of the wild-type strain of Synechocystis, which possesses abundant exopolysaccharides surrounding the cells, to that of an EPS-depleted mutant. We show, for the first time, that the exopolysaccharides play a crucial role in Synechocystis protection against cell killing caused by TiO2 NPs
Keywords : TiO2 nanoparticles Cyanobacteria Exopolysaccharides Reactive Oxygen Species Toxicity
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https://hal-insu.archives-ouvertes.fr/insu-02885418
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Submitted on : Tuesday, June 30, 2020 - 4:35:25 PM
Last modification on : Wednesday, December 15, 2021 - 10:02:21 AM

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INSU | IMPMC | ALLINSP | CEA | SU-SCIENCES | UPMC | SORBONNE-UNIVERSITE | CNRS | UNIV-PARIS7 | UNIV-PARIS | AFRIQ | IPGP | SIS2M | IRAMIS | INC-CNRS

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Mariane Planchon, Thichakorn Jittawuttipoka, Corinne Cassier-Chauvat, François Guyot, Alexandre Gelabert, et al.. Exopolysaccharides protect Synechocystis against the deleterious effects of Titanium dioxide nanoparticles in natural and artificial waters. Journal of Colloid and Interface Science, Elsevier, 2013, 405, pp.35-43. ⟨10.1016/j.jcis.2013.05.061⟩. ⟨insu-02885418⟩

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