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Decline in CD4+ cell numbers reflects increase in HIV-1 replication
Insights
Detecting human immunodeficiency virus type 1 antigen (HIV-1-Ag) in serum indicates a decline in CD4+ cell counts. Persistent HIV-1-Ag positivity correlates with a significant drop in CD4+ cells, while remaining HIV-1-Ag negative stabilizes counts.
Area of Science:
- Immunology
- Virology
- Public Health
Background:
- Human immunodeficiency virus type 1 (HIV-1) infection is characterized by a decline in CD4+ T-cell counts, a key indicator of immune system health.
- The presence of HIV-1 antigen (HIV-1-Ag) in serum is associated with active viral replication and disease progression.
Purpose of the Study:
- To investigate the relationship between the presence of HIV-1 antigen (HIV-1-Ag) in serum and changes in CD4+ cell numbers in a prospective cohort of homosexual men.
- To determine the impact of HIV-1-Ag seroconversion on CD4+ cell dynamics.
Main Methods:
- Prospective follow-up of homosexual men over 30 months.
- Monitoring of CD4+ cell counts and detection of HIV-1 antigen (HIV-1-Ag) and HIV-1 antibody (HIV-1-Ab) in serum.
- Analysis of CD4+ cell changes in relation to HIV-1-Ag status and seroconversion.
Main Results:
- CD4+ cell counts remained stable in HIV-1-Ab seropositives who were consistently HIV-1-Ag negative.
- CD4+ cell counts declined significantly in HIV-1-Ab seropositives who were persistently HIV-1-Ag positive.
- A decline in CD4+ cells was observed around the time of HIV-1-Ab seroconversion, irrespective of antigen expression duration.
- HIV-1-Ab seroconverters who became HIV-1-Ag positive showed a steady decline in CD4+ cells, while those remaining HIV-1-Ag negative had stable counts post-seroconversion.
Conclusions:
- The presence of HIV-1 antigen (HIV-1-Ag) in serum is a strong predictor of CD4+ cell decline in individuals with HIV-1 infection.
- Monitoring HIV-1-Ag status can help identify individuals at higher risk of immune deterioration.
- Early viral replication, indicated by antigen presence, precedes or coincides with antibody seroconversion and is associated with subsequent CD4+ cell loss.
Abstract:
Changes in CD4+ cell numbers were studied in relation to the presence of HIV-1 antigen (HIV-1-Ag) in serum from homosexual men followed prospectively. During 30 months of follow-up the mean CD4+ cell number (x 10(9) per liter) was stable in 134 at entry HIV-1 antibody (HIV-1-Ab) seropositives, who remained HIV-1-Ag negative (from 0.59 to 0.62) and declined in 38 at entry HIV-1-Ab seropositives who were persistently HIV-1-Ag positive (from 0.43 to 0.34). In sera of 9 of 65 HIV-1-Ab seroconverters HIV-1-Ag was detected only once, 3 months before or concomitantly with antibody seroconversion. Another 11 men became persistently HIV-1-Ag positive with antibody seroconversion or 2-6 weeks thereafter. A decline in CD4+ cell numbers was seen between 6 months before and the moment of HIV-1-Ab seroconversion, independently of duration and level of antigen expression. This indicates initial HIV-1 replication in both HIV-1-Ag negatives and positives. Following antibody seroconversion, HIV-1-Ag negatives had higher CD4+ cell numbers than HIV-1-Ag positives. Similarly to those who were HIV antigenemic from entry of the study, the HIV-1-Ab seroconverters who concomitantly with seroconversion or shortly thereafter became HIV-1 antigenemic showed a steady and significant (p = 0.01) decline in CD4+ cell numbers. In those who remained HIV-1-Ag negative after antibody seroconversion, CD4+ cell numbers were stable during follow-up.(ABSTRACT TRUNCATED AT 250 WORDS)