Abstract
Tris (2-chloroethyl) phosphate (TCEP) is a crucial organophosphorus flame retardant widely used in many industrial and commercial products. Available reports reported that TCEP could cause various toxicological effects on organisms, including humans. Unfortunately, toxicity data for TCEP (particularly on neurotoxicity) on aquatic organisms are lacking. In the present study, Danio rerio were exposed to different concentrations of TCEP for 42 days (chronic exposure), and oxidative stress, neurotoxicity, sodium, potassium-adenosine triphosphatase (Na+, K+-ATPase) activity, and histopathological changes were evaluated in the brain. The results showed that TCEP (100 and 1500 µg L−1) induced oxidative stress and significantly decreased the activities of antioxidant enzymes (SOD, CAT and GR) in the brain tissue of zebrafish. In contrast, the lipid peroxidation (LPO) level was increased compared to the control group. Exposure to TCEP inhibited the acetylcholinesterase (AChE) and Na+,K+-ATPase activities in the brain tissue. Brain histopathology after 42 days of exposure to TCEP showed cytoplasmic vacuolation, inflammatory cell infiltration, degenerated neurons, degenerated purkinje cells and binucleate. Furthermore, TCEP exposure leads to significant changes in dopamine and 5-HT levels in the brain of zebrafish. The data in the present study suggest that high concentrations of TCEP might affect the fish by altering oxidative balance and inducing marked pathological changes in the brain of zebrafish. These findings indicate that chronic exposure to TCEP may cause a neurotoxic effect in zebrafish.
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The author (Jesudass Sutha) wish to thank Rashtriya Uchchattar Shiksha Abhiyan (RUSA) 2.0 – BCTRC Bharathiar Cancer Theranostics Research Centre for providing fellowship.
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Jesudass Sutha: Conceptual framework, Experiments, Investigation, Data curation, Original manuscript writing.
Murugesh Gayathri: Resources, Experiments, Investigation, Formal data analysis.
Mathan Ramesh: Conceptual framework, Supervision, Resources, Writing—review and editing.
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Sutha, J., Gayathri, M. & Ramesh, M. Chronic exposure to tris (2-chloroethyl) phosphate (TCEP) induces brain structural and functional changes in zebrafish (Danio rerio): A comparative study on the environmental and LC50 concentrations of TCEP. Environ Sci Pollut Res 31, 16770–16781 (2024). https://doi.org/10.1007/s11356-024-32154-y
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DOI: https://doi.org/10.1007/s11356-024-32154-y