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Published on: May 7, 2013
Exposure to TiO2 Nanoparticles Induces Immunological Dysfunction in Mouse Testitis
Fashui Hong1,2,3, Yajing Wang1,2,3, Yingjun Zhou1,2,3
1Jiangsu Collaborative Innovation Center of Regional Modern Agriculture & Environmental Protection, Huaiyin Normal University , Huaian 223300, China.
Abstract:
Although TiO2 nanoparticles (NPs) as endocrine disruptors have been demonstrated to be able to cross the blood-testis barriers and induce reproductive toxicity in male animals, whether the reproductive toxicity of male animals due to exposure to endocrine disruptor TiO2 NPs is related to immunological dysfunction in the testis remains not well understood. This study determined whether the reproductive toxicity and immunological dysfunction induced by exposure to TiO2 NPs is associated with activation or inhibition of TAM/TLR-mediated signal pathway in mouse testis. The results showed that male mice exhibited significant reduction of fertility, infiltration of inflammatory cells, rarefaction, apoptosis, and/or necrosis of spermatogenic cells and Sertoli cells due to TiO2 NPs. Furthermore, these were associated with decreased expression of Tyro3 (-18.16 to -66.6%), Axl (-14.7 to -57.99%), Mer (-7.98 to -72.62%), and IκB (-11.25 to -63.16%), suppression of cytokine signaling (SOCS) 1 (-21.99 to -73.8%) and SOCS3 (-8.11 to -34.86%), and increased expression of Toll-like receptor (TLR)-3 (21.4-156.03%), TLR-4 (37.0-109.87%), nuclear factor-κB (14.75-69.34%), interleukin (IL)-lβ (46.15-123.08%), IL-6 (2.54-81.98%), tumor necrosis factor-α (6.95-88.39%), interferon (IFN)-α (2.54-37.25%), and IFN-β (10.19-80.56%), which are involved in the immune environment in the testis. The findings showed that reproductive toxicity of male mice induced by exposure to endocrine disruptor TiO2 NPs may be associated with biomarkers of impairment of immune environment or dysfunction of TAM/TLR3-mediated signal pathway in mouse testitis. Therefore, the potential risks to reproductive health should be attended, especially in those who are occupationally exposed to TiO2 NPs.
Insights
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.
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.
