Complement activation and immune complexes in early congenital HIV infection

Area of Science:

• Immunology
• Virology
• Pediatrics

Background:

• Congenital human immunodeficiency virus (HIV) infection shares features with adult HIV, including complement activation and circulating immune complexes.
• Understanding the early immune response in infants is crucial for managing congenital HIV.

Purpose of the Study:

• To determine if complement activation in congenitally HIV-infected infants involves the classic, alternative, or both pathways.
• To investigate the relationship between complement activation and circulating immune complexes in this population.
• To establish the earliest detection time for complement activation and immune complexes in congenital HIV infection.

Main Methods:

• Analysis of complement pathway activation (classic and alternative).
• Detection and quantification of C1q-binding immune complexes.
• Longitudinal assessment in infants and children with congenital HIV infection.

Main Results:

• Classic complement pathway activation and C1q-binding immune complexes were detected within the first 4 months of life in infants with congenital HIV.
• A weak association was observed between classic pathway activation and immune complexes before 10 months of age.

Conclusions:

• Early-onset complement activation via the classic pathway occurs in congenital HIV infection.
• The findings suggest complex interactions between complement and immune complexes in early pediatric HIV, requiring further study.
• These results highlight the need to explore complement-mediated immune complex processing in HIV-infected infants.