HIV-1 Infection Promotes Cholesterol Aggregation by Inducing miR-33b-5p to Suppress ABCA1 Expression

Area of Science:

• Virology
• Molecular Biology
• Biochemistry

Background:

• MicroRNAs are key regulators in virus-host interactions.
• Dysregulation of lipid metabolism is observed in individuals with human immunodeficiency virus type 1 (HIV-1) infection.

Purpose of the Study:

• To investigate the role of miR-33b-5p in HIV-1 infection.
• To elucidate the mechanism of altered lipid transport in HIV-1-infected cells.

Main Methods:

• Quantification of miR-33b-5p expression in HIV-1-infected cell lines and human serum.
• Analysis of ATP-binding cassette transporter (ABCA1) levels in HIV-1-infected cells.
• Assessment of lipid transport and accumulation in macrophages.
• Evaluation of the effects of an miR-33b-5p inhibitor.

Main Results:

• miR-33b-5p expression was significantly elevated in HIV-1-infected cells and serum.
• ABCA1 levels were reduced in HIV-1-infected cells, with miR-33b-5p identified as a direct target.
• HIV-1 infection induced aberrant lipid transport and intracellular lipid accumulation in macrophages.
• Treatment with an miR-33b-5p inhibitor reversed these lipid metabolism abnormalities.

Conclusions:

• HIV-1 infection upregulates miR-33b-5p, which downregulates ABCA1, leading to impaired lipid transport.
• This miR-33b-5p/ABCA1 pathway represents a novel mechanism contributing to poor lipid metabolism in HIV-1.
• Targeting miR-33b-5p offers a potential therapeutic strategy for managing lipid disorders in individuals with HIV-1.