CD8⁺ T cells induce interstrand crosslinking-associated DNA damage in neurons

Area of Science:

• Neuroscience
• Immunology
• Genetics

Background:

• Viral infections can lead to long-term neurological problems.
• The role of CD8+ T cells in these neurological issues is not fully understood.
• DNA damage is a potential mechanism linking viral infections to neuronal dysfunction.

Purpose of the Study:

• To investigate if CD8+ T cells induce DNA damage in neurons.
• To explore the mechanisms by which CD8+ T cells may cause neurological dysfunction.
• To examine the link between CD8+ T cell-induced DNA damage and neurodegenerative diseases.

Main Methods:

• Used a mouse model of neurotropic flavivirus infection.
• Employed an in vitro co-culture system of primary neurons and CD8+ T cells.
• Analyzed human transcriptomic data from patients with Parkinson's disease, Alzheimer's disease, and multiple sclerosis.

Main Results:

• Viral infection upregulated genes associated with interstrand crosslinking (ICL) DNA damage.
• CD8+ T cells induced ICL-like DNA damage in primary neurons.
• Human neurodegenerative diseases showed overexpression of ICL damage-associated genes.

Conclusions:

• CD8+ T cells cause genotoxic DNA damage in neurons.
• This damage is independent of antigen-specific interactions or direct cell contact.
• CD8+ T cell-induced neuronal DNA damage may contribute to neurodegenerative conditions.