Multiwalled carbon nanotubes hinder microglia function interfering with cell migration and phagocytosis

Area of Science:

• Neuroscience
• Nanotechnology
• Toxicology

Background:

• Intranasal delivery of engineered nanomaterials offers potential for brain-targeted nano-medicines.
• Multiwalled carbon nanotubes (MWCNTs) are candidates for brain cancer therapy due to their ability to cross barriers and inhibit cancer cell proliferation.
• Microglia, the brain's resident macrophages, are key cells involved in nanomaterial transport and brain immune responses.

Purpose of the Study:

• To investigate the effects of MWCNTs on microglial cell function and viability.
• To assess the potential risks associated with MWCNT exposure in the brain.
• To identify strategies for improving the biocompatibility of MWCNTs for therapeutic applications.

Main Methods:

• Primary microglial cell cultures were treated with varying doses of MWCNTs.
• Cell division arrest and apoptosis were quantified using specific assays.
• Cell migration and phagocytosis assays were performed to evaluate microglial function.
• Live imaging techniques were employed to observe cellular responses in real-time.

Main Results:

• MWCNTs induced a dose-dependent cell division arrest and apoptosis in microglial cells.
• MWCNTs significantly impaired both the migration and phagocytic capabilities of microglia.
• These findings highlight potential neurotoxic effects of MWCNTs on brain immune cells.

Conclusions:

• The use of MWCNTs for intranasal brain delivery requires careful consideration of their impact on microglial cells.
• Re-evaluation of the safety of inhaled airborne CNTs is warranted.
• Strategies for biocompatibilizing MWCNTs are crucial to mitigate damage to brain macrophages and develop safer nanodrugs.