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A Caenorhabditis elegans Nutritional-status Based Copper Aversion Assay

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Nematode Uptake Preference toward Different Nanoplastics through Avoidance Behavior Regulation.

Caijiao He¹, Xintong Lin², Pei Li¹

¹Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Department of Environmental Science, Zhejiang University, Hangzhou 310058, China.

|April 18, 2024

Summary

This summary is machine-generated.

Organisms avoid ingesting nanoplastics, with smaller or positively charged particles causing greater avoidance due to toxicity. This defense mechanism, mediated by the insulin/IGF signaling pathway, impacts ecological risk assessment.

Keywords:

avoidance insulin/IGF signaling (IIS) pathway nanoplastic nematode uptake preference

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Area of Science:

Environmental toxicology
Nematode biology
Nanoparticle science

Background:

Understanding nanoplastic bioaccumulation is crucial for assessing ecological risks associated with global plastic pollution.
Invertebrate uptake of nanoplastics is a critical step in food chain transport, but the regulatory mechanisms are not well understood.

Purpose of the Study:

To investigate the uptake mechanisms and preferences of nanoplastics in invertebrates.
To elucidate the biological regulatory mechanisms behind nanoplastic avoidance.
To determine the relationship between nanoplastic characteristics and uptake preference.

Main Methods:

Utilized *Caenorhabditis elegans* as a model organism.
Investigated nanoplastic uptake and avoidance behavior.
Performed transcriptomic analysis to identify molecular pathways involved.
Validated findings using mutant strains.

Main Results:

Nematodes actively avoid nanoplastics, with smaller (100 nm) and positively charged nanoplastics inducing stronger avoidance due to higher toxicity.
Nanoplastic accumulation was lower in nematodes exposed to smaller or positively charged particles compared to larger (500 nm) or negatively charged ones.
The insulin/IGF signaling (IIS) pathway, particularly DAF-16 activation, was confirmed as essential for selective nanoplastic avoidance and defense responses.

Conclusions:

*C. elegans* exhibits size- and charge-dependent avoidance of nanoplastics, driven by toxicity.
The IIS pathway plays a vital role in mediating defense and avoidance behaviors against nanoplastics in nematodes.
This genetically conserved defense response suggests potential cascading ecological risks in ecosystems due to differential nanoplastic uptake preferences.