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The importance of CCAAT/enhancer binding proteins (C/EBPs) and binding sites for HIV-1 replication in primary macrophages, T cell lines and primary CD4+ T cells was examined. When lines overexpressing the C/EBP dominant-negative protein LIP were infected with HIV-1, replication occurred in Jurkat T cells but not in U937 promonocytes, demonstrating a requirement for C/EBP activators by HIV-1 only in promonocytes. Primary macrophages did not support the replication of HIV-1 harboring mutant C/EBP binding sites in the long terminal repeat but Jurkat, H9 and primary CD4+ T cells supported replication of wild-type and mutant HIV-1 equally well. Thus the requirement for C/EBP sites is also confined to monocyte/macrophages. The requirement for C/EBP proteins and sites identifies the first uniquely macrophage-specific regulatory mechanism for HIV-1 replication.

CCAAT/enhancer binding protein (C/EBP) sites are required for HIV-1 replication in primary macrophages but not CD4+T cells

CCAAT/enhancer binding protein (C/EBP) sites are required for HIV-1 replication in primary macrophages but not CD4⁺T cells