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Primate lentiviruses, including HIV-1, transduce terminally differentiated, nondividing myeloid cells; however, these cells are refractory to infection by gammaretroviruses such as murine leukemia virus (MLV). Here, we present evidence that a cellular restriction is the obstacle to transduction of macrophages by MLV. Neutralization of the restriction by Vpx, a primate lentiviral protein previously...
B lymphocyte hyperactivation and elevated immunoglobulin levels (hypergammaglobulinemia) are pathogenic manifestations of HIV-1 infection. Here we provide evidence that these hallmarks are caused by a soluble factor whose production by infected macrophages is induced by the HIV-1 Nef protein. In vitro, HIV-1-infected macrophages or macrophages expressing Nef promoted B cell activation and differentiation...
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