{"id":60753,"date":"2021-05-27T09:16:21","date_gmt":"2021-05-27T13:16:21","guid":{"rendered":"https:\/\/dev.inrs.ca\/?p=60753"},"modified":"2021-05-27T09:18:53","modified_gmt":"2021-05-27T13:18:53","slug":"effects-of-nanoplastics-on-canadian-and-guadeloupean-oysters","status":"publish","type":"post","link":"https:\/\/dev.inrs.ca\/en\/news\/effects-of-nanoplastics-on-canadian-and-guadeloupean-oysters\/","title":{"rendered":"Effects of nanoplastics on Canadian and Guadeloupean oysters"},"content":{"rendered":"\n

An international research shows that the exposure of oysters to nanoplastics and arsenic could affect their biological functions.<\/strong><\/p>\n\n\n\n

\"An<\/figure><\/div>\n\n\n\n
<\/div>\n\n\n\n

Oysters\u2019 exposure to plastics is concerning, particularly because these materials can accumulate and release metals which are then absorbed by the molluscs. According to a recent study<\/a> published in the journal Chemosphere<\/em><\/a>, the combined presence of nanoplastics and arsenic affects the biological functions of oysters. This study was conducted by the Institut national de la recherche scientifique (INRS) in Qu\u00e9bec City and the French National Centre for Scientific Research<\/a> (CNRS) at the University of Bordeaux<\/a> in France.<\/p>\n\n\n\n

The international research team chose to study arsenic, since it is one of the most common metals absorbed by the plastic debris collected from the beaches of Guadeloupe. <\/p>\n\n\n\n

\u201cOysters easily accumulate metals from the environment into their tissues. We therefore wanted to test whether the combined exposure to nanoplastics and arsenic would increase the bioaccumulation of this contaminant.\u201d <\/p>Marc Lebordais, the Master\u2019s student in charge of the research.<\/cite><\/blockquote>\n\n\n\n

The scientists proved that the bioaccumulation of arsenic does not increase when nanoplastics are also present. However, it remained higher in the gills of the Canadian Crassostrea virginica<\/em> oyster than in the Isognomon alatus <\/em>oyster, found in Guadeloupe. These results are the first to highlight the diverging sensitivity of different species.<\/p>\n\n\n\n


Gene deregulation<\/strong><\/h2>\n\n\n\n

In addition to bioaccumulation, the team also observed an overexpression of genes responsible for cell death and the number of mitochondria\u2014a cell\u2019s energy centres\u2014in C. virginica<\/em>.In I. alatus<\/em>, the expression of these same genes was less significant.<\/em><\/p>\n\n\n\n

\u201cEvaluating the expression of genes involved in important functions, such as cell death and detoxification, gives us information on the toxicity of nanoplastics and arsenic on a cellular level,\u201d explained the young researcher, who is co-directed by Professors Val\u00e9rie Langlois<\/a> of INRS and Magalie Baudrimont of the University of Bordeaux.<\/p>\n\n\n\n


The food chain<\/strong><\/h2>\n\n\n\n

The next step, after characterizing the presence of nanoplastics and arsenic in oysters, would be to study how these contaminants are transferred through the food chain.<\/p>\n\n\n\n

\u201cAnalytical tools are currently being developed to quantify the presence of nanoplastics in biological tissues,\u201d said Marc Lebordais. \u201cUnderstanding the amount of nanoplastics in farmed oysters currently boils down to a technical issue.\u201d 
<\/p>\n\n\n\n


About the study<\/strong><\/h3>\n\n\n\n

The article \u201cMolecular impacts of dietary exposure to nanoplastics combined with arsenic in Canadian oysters (Crassostrea virginica<\/em>) and bioaccumulation comparison with Caribbean oysters (Isognomon alatus<\/em>)\u201d, written by Marc Lebordais, Juan Manuel Gutierrez-Villagomez, Julien Gigault, Magalie Baudrimont, and Val\u00e9rie Langlois, was published in the journal Chemosphere<\/em>. The study received financial support from the French National Research Agency<\/a> (ANR), the CNRS, and from Canada Research Chairs.<\/p>\n","protected":false},"excerpt":{"rendered":"

An international research shows that the exposure of oysters to nanoplastics and arsenic could affect their biological functions.<\/p>\n","protected":false},"author":392,"featured_media":61026,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[688],"tags":[],"sectors":[729,728],"class_list":["post-60753","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-innover-a-linrs-en","sectors-environnement-en","sectors-eau-en"],"acf":[],"yoast_head":"\nEffects of nanoplastics on Canadian and Guadeloupean oysters | INRS<\/title>\n<meta name=\"description\" content=\"An international research shows that the exposure of oysters to nanoplastics and arsenic could affect their biological functions.\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" 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