Retrovirology

, 6:P56 | Cite as

P04-28. Breadth and magnitude of neutralizing antibody responses in subjects infected with HIV-1 subtype D or recombinants in Rakai district, Uganda

  • L Eller
  • B Ouma
  • P Oballah
  • MA Eller
  • MS de Souza
  • F Wabwire-Mangen
  • O Laeyendecker
  • T Quinn
  • N Kiwanuka
  • D Serwadda
  • N Sewankambo
  • M Wawer
  • R Gray
  • NL Michael
  • ML Robb
  • D Montefiori
  • BK Brown
  • VR Polonis
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Keywords

Viral Replication Neutralize Antibody Great Magnitude Potent Response High Viral Load 

Background

Limited information is available regarding HIV-1 neutralizing antibody (NAb) responses in clade D infection. Here we assess the breadth and magnitude of NAb responses in clade D or D recombinant infections, and correlate both to clinical outcomes.

Methods

Participants were enrolled in an HIV-1 incidence cohort in Rakai district, Uganda, between 1999 and 2004. The TZM-bl NAb assay was performed against a panel of 10 Tier 2 pseudoviruses (2 each of clades A, B, C, D and CRF02 AG) using one early plasma (within 1 year of seroconversion) and one later sample (3–4 years after seroconversion) from 21 participants (11 Clade D and 10 recombinants). Subtype was determined using a Multi-Region Hybridization assay.

Results

Overall, subjects showed more NAb against subtypes A, AG and D, compared to subtypes B and C. Increased magnitude was observed at later timepoints in 81% (17/21) of subjects, with geometric mean titers against the 10 viruses ranging from <20 to 1035. NAb breadth increased in 71% (15/21) of subjects. No statistical differences were seen in magnitude or breadth comparing recombinant versus clade D infections. Strikingly, higher NAb magnitude in both the early (P = 0.048) and late (P = 0.009) plasmas was associated with progression to AIDS. Higher viral load (>50,000 copies/ml) at the early timepoint was associated with greater magnitude (p < 0.0001) and breadth (p = 0.04) of neutralization over time.

Conclusion

These data demonstrate an expansion of breadth and magnitude of NAb over time in subtype D and D recombinant HIV-1 infections in Uganda, with more frequent and potent responses directed against subtypes A, CRF02 AG, and D. Higher viral load was associated with greater breadth and magnitude of neutralization, indicating that increased antigen load with viral replication may be driving the expansion of pseudovirus NAb responses in this cohort, with no observed benefit in clinical outcome.

Copyright information

© Eller et al; licensee BioMed Central Ltd. 2009

This article is published under license to BioMed Central Ltd.

Authors and Affiliations

  • L Eller
    • 1
  • B Ouma
    • 2
  • P Oballah
    • 2
  • MA Eller
    • 1
  • MS de Souza
    • 3
  • F Wabwire-Mangen
    • 4
  • O Laeyendecker
    • 5
  • T Quinn
    • 5
  • N Kiwanuka
    • 4
  • D Serwadda
    • 4
  • N Sewankambo
    • 6
  • M Wawer
    • 5
  • R Gray
    • 5
  • NL Michael
    • 1
  • ML Robb
    • 1
  • D Montefiori
    • 7
  • BK Brown
    • 1
  • VR Polonis
    • 1
  1. 1.Makerere Univ. Walter Reed Project/US Military HIV Research ProgramKampalaUganda
  2. 2.Makerere University Walter Reed ProjectKampalaUganda
  3. 3.Armed Forces Research Institute of Medical SciencesBangkokThailand
  4. 4.Makerere Univ. Walter Reed/Makerere Univ School of Public HealthKampalaUganda
  5. 5.Johns Hopkins School of Medicine, NIAID, NIHBaltimoreUSA
  6. 6.Makerere University College of Health SciencesKampalaUganda
  7. 7.Duke UniversityDurhamUSA

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