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Silver effects on silkworm, Bombyx mori.

Abdelli Nouara1,2, Peng Lü2, Liang Chen2

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|December 7, 2018
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Direct ingestion of silver nanoparticles (Ag-NPs) in silkworms altered gene expression related to metabolism and digestion. High concentrations increased body weight but caused midgut damage, indicating potential toxicity.

Keywords:
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Area of Science:

  • Nanotechnology
  • Toxicology
  • Molecular Biology

Background:

  • Silver nanoparticles (Ag-NPs) are widely used in consumer products, including food packaging.
  • Understanding the in vivo toxicity of Ag-NPs is crucial due to potential human exposure through diet.

Purpose of the Study:

  • To evaluate the toxicity of ingested Ag-NPs on silkworm growth and development.
  • To examine Ag-NP distribution and histopathological effects in silkworms.
  • To investigate the molecular mechanisms of Ag-NP toxicity using transcriptomics.

Main Methods:

  • Silkworms were exposed to varying concentrations of Ag-NPs (1-100 mg·L⁻¹).
  • Body weight, Ag-NP distribution, and midgut histopathology were analyzed.
  • RNA sequencing was performed to assess transcriptomic responses.

Main Results:

  • High Ag-NP concentrations significantly increased silkworm body weight.
  • Histopathological changes were observed in the midgut.
  • Gene expression analysis revealed alterations in carbohydrate, digestive, and energy metabolism pathways.

Conclusions:

  • Ag-NPs can induce toxicity in silkworms, primarily affecting the digestive system.
  • Exposure leads to energy deregulation and imbalances in nutrient digestion and absorption.
  • This study provides insights into the molecular mechanisms of Ag-NP toxicity in vivo.