Multi-biomarker approach to evaluate the toxicity of chlorpyrifos (active ingredient and a commercial formulation) on different stages of Biomphalaria straminea

• Published in: Comparative biochemistry and physiology. Toxicology & pharmacology Vol. 281; p. 109923
• Main Authors: Bianco, Karina Alesia, Martini, Claudia Noemí, Tejedor, María José, Paredes, María Gimena, Kristoff, Gisela
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.07.2024
• Subjects: Animals; Antioxidants; Biomarkers - metabolism; Biomphalaria - drug effects; Catalase - metabolism; Chlorpyrifos - toxicity; Embryo, Nonmammalian - drug effects; Embryotoxicity; Gastropods; Hemocytes; Hemocytes - drug effects; Insecticides - toxicity; Lethal Dose 50; Neurotoxicity; Reproduction - drug effects; Superoxide Dismutase - metabolism; Water Pollutants, Chemical - toxicity; NADPH; CDNB; WC; CEs; SC; Antioxidants; BSA; Neurotoxicity; AcSCh; p-NPB; GSH; p-NPA; AChE; ChE; GSSG; NBT; OP; Embryotoxicity; CF; DTNB; AI; GST; SOD; GR; EROS; CAT; Gastropods; Hemocytes
• ISSN: 1532-0456; 1878-1659
• DOI: 10.1016/j.cbpc.2024.109923

Biomphalaria straminea is a freshwater gastropod native to South America and used in toxicological assessments. Our aim was to estimate 48 h-LC50 and sub-chronic effects after the exposure to low concentrations of chlorpyrifos as commercial formulation (CF) and active ingredient (AI) on B. straminea adult, embryos and juveniles. Concentrations between 1 and 5000 μg L−1 were chosen for acute exposures and 0.1 and 1 μg L−1 for the sub-chronic one. After 14 days biochemical parameters, viability and sub-populations of hemocytes, reproductive parameters, embryotoxicity and offspring' survival were studied. Egg masses laid between day 12 and 14 were separated to continue the exposure and the embryos were examined daily. Offspring' survival and morphological changes were registered for 14 days after hatching. 48 h-LC50, NOEC and LOEC were similar between CF and AI, however the CF caused more sub-lethal effects. CF but not the AI decreased carboxylesterases, catalase and the proportion of hyalinocytes with respect to the total hemocytes, and increased superoxide dismutase and the % of granulocytes with pseudopods. Also CF caused embryotoxicity probably due to the increase of embryos' membrane permeability. Acetylcholinesterase, superoxide dismutase, hemocytes sub-populations, the time and rate of hatching and juveniles' survival were the most sensitive biomarkers. We emphasize the importance of the assessment of a battery of biomarkers as a useful tool for toxicity studies including reproduction parameters and immunological responses. Also, we highlight the relevance of incorporating the evaluation of formulations in order to not underestimate the effects of pesticides on the environment. [Display omitted] •In adult snails, 48 h LC50 not differ between active ingredient and a formulation.•Acetylcholinesterase was more sensitive to the active ingredient than the formulation.•Chlorpyrifos modified hemocytes sub-populations increasing granulocytes.•The formulation increased the time and decreased the percentage of hatching.•Chlorpyrifos, active ingredient and formulation, causes lethality in the juveniles.