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Cell-based assays as an alternative for the study of aquatic toxicity of pharmaceuticals

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Abstract

An increasing number and amount of pharmaceuticals for human and veterinary use currently reach the aquatic environment, and the determination of their effects on aquatic organisms becomes of major importance. The 96-h fish lethal test is one of the conventional assays required for environmental hazardous assessment, but it is extremely time-consuming and costly, and it raises ethical concerns. In a broad study, we compared the ability of cell-based assays to detect, in absolute terms, lethal toxicity in fish due to pharmaceuticals in order to select sensitive cell lines to be posteriorly used as an alternative to fish testing. This study also explored the sensitivity of the rat cardiomyoblast H9c2(2-1) cell line and the suitability of the sulforhodamine B colorimetric assay regarding 15 pharmaceuticals belonging to 9 different therapeutic classes. The relation between in vivo and in vitro data was expressed as LC50,96h/EC50 ratios, and 66% of concordant data were attained. Accordingly, it was possible to conclude that cell-based assays could be considered a suitable alternative to fish lethal testing for pharmaceuticals, which, after validation, may dramatically reduce the number of fish required for environmental hazardous assessment. Several cell lines were selected as promising alternatives, but H9c2(2-1), HepG2, PLHC-1, and RTG-2 could be considered suitable starting cell types for further studies, as relevant results were obtained with low exposure times.

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Funding

The Portuguese Foundation for Science and Technology (FCT) financially supported the present study through a fellowship attributed to Elsa Teresa Rodrigues (SFRH/BPD/116152/2016), which was funded by the Human Potential Operating Programme of the European Social Fund, and by the Portuguese budget through the Ministry of Education and Science. This study was also developed within the FishFree Project (PTDC/AAG-TEC/4966/2014), supported by FCT through national funds (3599-PPCDT), and the co-funding of the European Regional Development Fund (POCI-01-0145-FEDER-016875). It was also supported within the PT2020 Partnership Agreement and COMPETE 2020 by the Centre for Functional Ecology Strategic Project (UID/BIA/04004/2013).

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Authors and Affiliations

  1. CFE-Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal

    Elsa T. Rodrigues, Ana T. Varela & Miguel A. Pardal

  2. CNC-Centre for Neuroscience and Cell Biology, University of Coimbra, UC Biotech, Lot 8A, Biocant Park, 3060-197, Cantanhede, Portugal

    Vilma A. Sardão

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  1. Elsa T. Rodrigues
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  2. Ana T. Varela
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  3. Miguel A. Pardal
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  4. Vilma A. Sardão
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Correspondence to Elsa T. Rodrigues.

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Rodrigues, E.T., Varela, A.T., Pardal, M.A. et al. Cell-based assays as an alternative for the study of aquatic toxicity of pharmaceuticals. Environ Sci Pollut Res 27, 7145–7155 (2020). https://doi.org/10.1007/s11356-019-07384-0

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