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The alpha4beta7 integrin has been shown to serve as a coreceptor for HIV. One anti-alpha4 integrin agent (natalizumab) has been approved for the treatment of multiple sclerosis and Crohn's disease. We found that activation of CD4+ T cells with retinoic acid induced the upregulation of alpha4 and beta7 integrins. However, natalizumab failed to block the replication of HIV-1 strains in lymphoid MT-4 cells or CD4+ T cells at concentrations up to 125microg/ml. Our results suggest that alpha4 integrins are not essential cofactors for HIV replication.
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Pauls et al. (2008) studied this question.
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