Damage to the Blood Brain Barrier Structure and Function from Nano Titanium Dioxide Exposure Involves the Destruction...

Area of Science:

• Neuroscience
• Toxicology
• Materials Science

Background:

• Nano titanium dioxide (TiO₂) is known to accumulate in animal brains.
• Previous research indicates nano TiO₂ can damage the blood-brain barrier (BBB).
• The specific mechanisms, particularly the role of tight junction proteins, remain under-investigated.

Purpose of the Study:

• To investigate whether nano TiO₂ exposure leads to the destruction of tight junction proteins in the mouse brain.
• To assess the impact of nano TiO₂ on the structural integrity and permeability of the BBB.
• To elucidate the molecular mechanisms underlying nano TiO₂-induced BBB damage.

Main Methods:

• Mice were exposed to nano TiO₂ for 30 consecutive days.
• Transmission electron microscopy was used to examine BBB ultrastructure.
• Evans blue assay evaluated BBB permeability.
• Immunofluorescence and Western blotting assessed tight junction protein expression (Occludin, ZO-1, Claudin-5).

Main Results:

• Nano TiO₂ exposure damaged BBB ultrastructure.
• Increased BBB permeability was observed following nano TiO₂ exposure.
• Expression of Occludin, ZO-1, and Claudin-5 was significantly reduced in the mouse brain.

Conclusions:

• Nano TiO₂ damages the BBB's structure and function.
• The destruction of key tight junction proteins (Occludin, ZO-1, Claudin-5) is implicated in nano TiO₂-induced BBB damage.
• Findings suggest a potential neurotoxic pathway for nano TiO₂ exposure.