Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.26/4941
Título: Resistance to antibody neutralization in HIV-2 infection occurs in late stage disease and is associated with X4 tropism
Autor: Marcelino, José Maria
Borrego, Pedro
Nilsson, Charlotta
Família, Carlos
Barroso, Helena
Maltez, Fernando
Doroana, Manuela
Antunes, Francisco
Quintas, Alexandre
Taveira, Nuno
Palavras-chave: HIV-2
X4 Tropism
Antibody neutralization
Data: 28-Nov-2012
Editora: Lippincott Williams & Wilkins
Citação: AIDS. 28 November 2012 - Volume 26 - Issue 18 - p 2275–2284
Resumo: Objectives: To characterize the nature and dynamics of the neutralizing antibody (NAb) response and escape in chronically HIV-2 infected patients.
Methods: Twenty-eight chronically infected adults were studied over a period of 1-4 years. The neutralizing activity of plasma IgG antibodies against autologous and heterologous primary isolates was analyzed using a standard assay in TZM-bl cells. Coreceptor usage was determined in GHOST cells. The sequence and predicted 3Dstructure of the C2V3C3 Env region were determined for all isolates.
Results: Only 50% of the patients consistently produced IgG NAbs to autologous and contemporaneous virus isolates. In contrast, 96% of the patients produced IgG antibodies that neutralized at least two isolates of a panel of six heterologous R5 isolates. Breadth and potency of the neutralizing antibodies were positively associated with the number of CD4+ T cells and with the titer and avidity of C2V3C3-specific binding IgG antibodies. X4 isolates were obtained only from late stage disease patients and were fully resistant to neutralization. The V3 loop of X4 viruses was longer, had a higher net charge and differed markedly in secondary structure compared to R5 viruses.
Conclusions: Most HIV-2 patients infected with R5 isolates produce C2V3C3-specific neutralizing antibodies whose potency and breadth decreases as the disease progresses. Resistance to antibody neutralization occurs in late stage disease and is usually associated with X4 viral tropism and major changes in V3 sequence and conformation. Our studies support a model of HIV-2 pathogenesis in which the neutralizing antibodies play a central role and have clear implications for the vaccine field.
Descrição: This is a non-final version of an article published in final form in AIDS. 28 November 2012 - Volume 26 - Issue 18 - p 2275–2284
Peer review: yes
URI: http://hdl.handle.net/10400.26/4941
Versão do Editor: http://journals.lww.com/aidsonline/Abstract/2012/11280/Resistance_to_antibody_neutralization_in_HIV_2.2.aspx
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