Abstract
Okadaic acid (OA) is an important marine lipophilic phycotoxin with various pathological properties, responsible for diarrheal shellfish poisoning events in human beings over the world. However, to date no mechanism can well explain the toxicity and symptom of OA, even diarrhea. Here, to reveal the toxic mechanism of OA to mammals, we analyzed the metabolism of OA in rat and the effects of OA exposure on the composition and function of gut bacteria using a multi-omics strategy and rRNA high-throughput technology. We found that OA exerted great effects on gut bacteria, mainly featured in heavy fluctuation of dominant genera and significant changes in the mapped bacterial function genes, including not only virulence genes of pathogenic bacteria, but also bacterial metabolism genes. In the feces of the OA-exposed group, we detected dinophysistoxin-2 (DTX-2), lespedezaflavanone F and tolytoxin, suggesting that OA could be transformed into other metabolites like DTX-2. Other metabolic biomarkers such as N-Acetyl-a-neuraminic acid, N,N-dihydroxy-l-tyrosine, nalbuphine, and coproporphyrin I and III were also highly correlated with OA content, which made the toxicity of OA more complicated and confusing. Spearman correlation test demonstrated that Bacteroides and Romboutsia were the genera most related to OA transformation, suggesting that Bacteroides and Romboutsia might play a key role in the complicated and confusing toxicity of OA. In this study, we found for the first time that OA may be converted into other metabolites in gut, especially DTX-2. This finding could not only help to reveal the complex toxicity of OA, but also have important significance for clarifying the transportation, metabolism, and environmental fate of OA in the food chain.
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This work was supported by the National Key Research and Development Program of China (2019YFC0312601), National Natural Science Foundation of China (42076143, 41776120, 31801664) and China Postdoctoral Science foundation (2020M683178).
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Liu, Y., Lu, Y., Jiao, YH. et al. Multi-omics analysis reveals metabolism of okadaic acid in gut lumen of rat. Arch Toxicol 96, 831–843 (2022). https://doi.org/10.1007/s00204-021-03219-5
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DOI: https://doi.org/10.1007/s00204-021-03219-5