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Life cycle exposure to titanium dioxide nanoparticles (TiO2-NPs) induces filial toxicity and population decline in the nematode Caenorhabditis elegans

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Abstract

Titanium dioxide nanoparticle (TiO2-NP) exposure has raised significant concern due to their potential toxicity and adverse ecological impacts. Despite their ubiquitous presence in various environmental compartments, the long-term consequences of TiO2-NPs remain poorly understood. In this study, we combined data of in vivo toxicity and modeling to investigate the potential negative impacts of TiO2-NP exposure. We employed the nematode Caenorhabditis elegans, an environmental organism, to conduct a full life cycle TiO2-NP toxicity assays. Moreover, to assess the potential impact of TiO2-NP toxicity on population dynamics, we applied a stage-constructed matrix population model (MPM). Results showed that TiO2-NPs caused significant reductions in reproduction, survival, and growth of parental C. elegans (P0) at the examined concentrations. Moreover, these toxic effects were even more pronounced in the subsequent generation (F1) when exposed to TiO2-NPs. Furthermore, parental TiO2-NP exposure resulted in significant toxicity in non-exposed C. elegans progeny (TiO2-NPs free), adversely affecting their reproduction, survival, and growth. MPM analysis revealed decreased transition probabilities of surviving (Pi), growth (Gi), and fertility (Fi) in scenarios with TiO2-NP exposure. Additionally, the population growth rate (λmax) was found to be less than 1 in both P0 and F1, indicating a declining population trend after successive generations. Sensitivity analysis pinpointed L1 larvae as the most vulnerable stage, significantly contributing to the observed population decline in both P0 and F1 generations under TiO2-NP exposure. Our findings provide insight into the potential risk of an environmental organism like nematode by life cycle exposure to TiO2-NPs.

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All data supporting the findings of this study are available within the paper and its Supplementary Information, and are available from the corresponding author upon reasonable request.

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Funding

This work was financially supported in part by grants from the National Science and Technology Council of Taiwan (MOST 111–2313-B-002 -052 -MY3 and MOST 111–2320-B-002 -030 -MY3) and from NTU Core Consortiums (Ecotoxicity of long-term exposure to emerging pharmaceutical contaminant in C. elegans, NTU-CC-111L894702) to Professor Vivian H.-C. Liao.

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Hsin Yen: methodology, investigation, visualization, and writing—original draft. Chi-Wei Huang: methodology, visualization, and writing—original draft. Chien-Hou Wu: providing TiO2-NPs. Vivian H.-C. Liao: conceptualization, resources, writing—review and editing, supervision, and funding acquisition.

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Correspondence to Vivian Hsiu-Chuan Liao.

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Yen, H., Huang, CW., Wu, CH. et al. Life cycle exposure to titanium dioxide nanoparticles (TiO2-NPs) induces filial toxicity and population decline in the nematode Caenorhabditis elegans. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33159-3

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