HIV-1 and HIV-1-Tat Induce Mitochondrial DNA Damage in Human Neurons

Area of Science:

• Neuroscience
• Virology
• Genetics

Background:

• Mitochondrial dysregulation is a hallmark of HIV-1 infection.
• Accelerated aging in HIV-1 patients suggests a link between HIV-1 and age-related mitochondrial damage.
• Human models for studying HIV-1-induced mitochondrial DNA (mtDNA) damage are limited.

Purpose of the Study:

• To investigate whether HIV-1 infection or HIV-1 proteins can induce mtDNA damage.
• To explore the mechanisms by which HIV-1 proteins may cause mtDNA damage.
• To establish a human model for studying HIV-1-related mtDNA alterations.

Main Methods:

• Comparison of mtDNA and nuclear DNA (nDNA) damage in human cortical neurons and peripheral blood mononuclear cells (PBMC).
• Treatment of neuronal cultures with HIV-1-infected PBMC conditioned media or HIV-1 proteins (Tat, Vpr).
• Assessment of mitochondrial function, gene expression, and protein levels related to energy metabolism and apoptosis.

Main Results:

• HIV-1 infection and HIV-1 proteins (Tat, Vpr) significantly increased mtDNA damage in neuronal cells and PBMC.
• Tat protein was shown to dysregulate mitochondrial energy metabolism gene expression and induce apoptosis.
• HIV-1 and Tat caused more mtDNA damage than nDNA damage, confirming their specific impact on mtDNA.

Conclusions:

• HIV-1 infection and its proteins lead to increased mtDNA damage in neurons and PBMC.
• mtDNA damage contributes to neurodegeneration and neuronal apoptosis.
• The developed model system is suitable for studying HIV-1-induced mtDNA changes.