Targeting autophagy to treat HIV immune dysfunction

Area of Science:

• Immunology
• Virology
• Cellular Biology

Background:

• Chronic inflammation and immune activation are key drivers of Human Immunodeficiency Virus-1 (HIV-1) pathogenesis.
• Autophagy, a cellular degradation process, is crucial for maintaining cellular homeostasis and regulating immune responses, but its role in HIV infection remains unclear.

Purpose of the Study:

• To investigate the role of autophagy in regulating inflammation and antiviral T cell responses during HIV-1 infection.
• To evaluate the therapeutic potential of enhancing autophagy in an in vivo model of chronic HIV-1 infection.

Main Methods:

• Examined the effects of autophagy impairment and induction on type I Interferon (IFN-I) signaling in macrophages.
• Administered the autophagy inducer rapamycin to chronically HIV-1 infected humanized mice.
• Assessed IFN-I signaling, antiviral T cell function, and viral loads in treated mice.

Main Results:

• Impaired autophagy led to spontaneous IFN-I signaling, while autophagy induction reduced it in macrophages.
• In vivo rapamycin treatment decreased chronic IFN-I signaling in HIV-1 infected mice.
• Autophagy induction improved exhausted antiviral T cell function and reduced viral loads.

Conclusions:

• Autophagy plays a significant role in modulating inflammation and T cell responses during HIV-1 infection.
• Enhancing autophagy through inducers like rapamycin shows therapeutic potential for mitigating HIV-1 immunopathogenesis.
• Autophagy induction may improve antiviral immunity and reduce viral burden in HIV-1 infection.