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Exposure to TiO2 Nanoparticles Induces Immunological Dysfunction in Mouse Testitis.

Fashui Hong1,2,3, Yajing Wang1,2,3, Yingjun Zhou1,2,3

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Summary

Titanium dioxide nanoparticles (TiO2 NPs) exposure impairs male fertility and testicular immune function. This dysfunction involves the TAM/Toll-like receptor (TLR) signaling pathway, highlighting risks for reproductive health.

Keywords:
TAM/TLRs signal pathwayimmune dysfunctionreproductive toxicitytestitistitanium dioxide nanoparticles

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Area of Science:

  • Environmental Toxicology
  • Reproductive Toxicology
  • Immunotoxicology

Background:

  • Titanium dioxide nanoparticles (TiO2 NPs) are endocrine disruptors known to cross the blood-testis barrier.
  • Previous studies indicate TiO2 NPs can cause reproductive toxicity in male animals.
  • The link between TiO2 NP-induced reproductive toxicity and testicular immunological dysfunction is not well understood.

Purpose of the Study:

  • To investigate if reproductive toxicity and immunological dysfunction from TiO2 NP exposure are linked to the TAM/Toll-like receptor (TLR)-mediated signal pathway in mouse testes.
  • To identify specific molecular markers associated with these effects.

Main Methods:

  • Male mice were exposed to TiO2 NPs.
  • Evaluated fertility, testicular histology, and cell apoptosis/necrosis.
  • Assessed the expression levels of key proteins in the TAM/TLR signaling pathway and related inflammatory markers using quantitative analysis.

Main Results:

  • TiO2 NP exposure led to reduced male fertility, inflammatory cell infiltration, and damage (apoptosis/necrosis) to spermatogenic and Sertoli cells.
  • Significant alterations in the TAM/TLR pathway were observed, including decreased expression of Tyro3, Axl, Mer, IκB, SOCS1, and SOCS3.
  • Conversely, increased expression of TLR-3, TLR-4, nuclear factor-κB, IL-1β, IL-6, TNF-α, IFN-α, and IFN-β indicated an activated inflammatory response.

Conclusions:

  • Reproductive toxicity in male mice exposed to TiO2 NPs is associated with impaired testicular immune environment and dysfunction of the TAM/TLR3-mediated signaling pathway.
  • These findings suggest potential risks to reproductive health, particularly for individuals with occupational exposure to TiO2 NPs.
  • Further attention to reproductive health risks associated with TiO2 NP exposure is warranted.