Circulating microRNAs Related to Bone Metabolism in HIV-Associated Bone Loss

Area of Science:

• Endocrinology
• Virology
• Genetics

Background:

• Human immunodeficiency virus (HIV) infection is associated with complex bone loss.
• The specific mechanisms driving HIV-associated bone loss remain largely unknown.
• MicroRNAs (miRNAs) play a role in regulating bone metabolism.

Purpose of the Study:

• To investigate serum miRNA expression in individuals with HIV and bone loss.
• To identify specific miRNAs associated with osteoporosis/osteopenia in the context of HIV infection.
• To explore potential diagnostic biomarkers for HIV-associated bone disease.

Main Methods:

• A case-control study design was employed.
• Participants included male individuals with HIV and osteoporosis/osteopenia (HIV+/OP+), HIV+ individuals with normal bone mass (HIV+/OP-), and HIV-negative controls.
• Serum samples were analyzed for the expression of a panel of eight miRNAs involved in bone metabolism.

Main Results:

• Within the HIV+ cohort, significantly lower serum expression of miRNA-21-5p and miRNA-23a-3p was observed in HIV+/OP+ cases compared to HIV+/OP- controls (p < 0.001).
• Significantly higher serum expression of miRNA-24-2-5p was found in HIV+/OP+ cases versus HIV+/OP- controls (p = 0.030).
• miRNA-21-5p showed 84.6% sensitivity and 66.7% specificity in distinguishing HIV+/OP+ individuals.

Conclusions:

• Circulating miRNAs, specifically miRNA-21-5p, miRNA-23a-3p, and miRNA-24-2-5p, are significantly altered in individuals with HIV and osteoporosis.
• These altered miRNA patterns suggest a common molecular pathway in bone loss, potentially independent of the underlying cause.
• The findings highlight the potential of these miRNAs as biomarkers for HIV-associated bone loss.