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Cellular and oxidative stress responses of Mytilus galloprovincialis to chlorpromazine: implications of an antipsychotic drug exposure study
Summary
This study examined how the antipsychotic drug chlorpromazine affects Mediterranean mussels, finding that it reduced cell survival and disrupted antioxidant defenses even at very low concentrations found in the environment. While focused on pharmaceutical pollution rather than microplastics, the research is relevant because mussels are filter-feeders that also concentrate microplastics, and the combined exposure to drugs and plastics may compound toxic effects. The study highlights how multiple pollutants in marine environments can together threaten the safety of shellfish consumed by humans.
<b>Introduction:</b> Bivalve molluscs like <i>Mytilus galloprovincialis</i> are valuable bioindicators due to their filter-feeding lifestyle, wide distribution, and ability to concentrate xenobiotics. Studying the effects of pharmaceuticals on these molluscs is crucial given their presence in surface waters. This study investigated the response of <i>M. galloprovincialis</i> to chlorpromazine (Cpz), an antipsychotic with antiviral activity against influenza, HIV, and coronaviruses in human cells. <b>Methods:</b> In this study, we examined the 14-day impact of chlorpromazine (Cpz) on the model species <i>M. galloprovincialis</i> at two concentrations (Cpz 1: 12 ng <sup>L-1</sup> or 37 pM; Cpz 2: 12 µg <sup>L-1</sup> or 37 nM). To ensure controlled exposure, a stock solution of Cpz was prepared and introduced into the tanks to match the intended concentrations. Seawater and stock solutions were refreshed every 48 h. The primary focus of this study centered on evaluating cell viability, cell volume regulation, and oxidative stress indicators. <b>Results:</b> Although cell volume regulation, as assessed by decreasing regulatory volume Regulation volume decrease, did not show statistically significant changes during the experiment, digestive cell viability, on the other hand, showed a significant decrease (<i>p</i> < 0.01) in the Cpz 2 group, suggesting effects on the general health and survival of these cells. Biochemically, in both Cpz 1 and Cpz 2, superoxide dismutase activity increased, while catalase (CAT) decreased, causing an elevated lipid peroxidation thiobarbituric acid-reactive substances and protein carbonyls, particularly in the Cpz 2 group. The level of reduced glutathione (GSH) increased in both exposures, whereas the level of GSSG increased only in the Cpz 1 group. Consequently, the GSH/GSSG ratio was elevated in the Cpz 2 group only. <b>Discussion:</b> A comparison of the magnitudes of anti- and pro-oxidative manifestations indicated a pro-oxidative shift in both exposures. These findings show that Cpz induces non-specific symptoms of biochemical and cellular disturbances in <i>M. galloprovincialis</i> even at the low picomolar concentration.
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