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  • Title: HIV-1 Nef interferes with M-CSF receptor signaling through Hck activation and inhibits M-CSF bioactivities.
    Author: Suzu S, Harada H, Matsumoto T, Okada S.
    Journal: Blood; 2005 Apr 15; 105(8):3230-7. PubMed ID: 15626739.
    Abstract:
    HIV-1 Nef protein is a major determinant of the pathogenicity of the virus. It has been shown that Nef activates Hck, a member of Src family kinase, in monocytes/macrophages and that the interaction is critical for AIDS-like disease progression in a mouse model. However, it was unclear how the molecular interaction in monocytes/macrophages leads to disease progression. Here, we show for the first time that Nef interferes with the macrophage colony-stimulating factor (M-CSF)/M-CSF receptor signal pathway. In this study, we introduced a conditionally active Nef into myeloid leukemia TF-1-fms cells and analyzed their responsiveness to M-CSF. We found that Nef-activated Hck constitutively associated with the M-CSF receptor complex. The formation of the molecular complex should occur under physiologic conditions, that is, on M-CSF stimulation. Because of aberrant molecular association, the tyrosine-phosphorylation/activation of the receptor in response to M-CSF was markedly diminished in Nef-active cells. Consequently, Nef activation caused the inhibition of M-CSF-mediated proliferation of TF-1-fms cells and macrophage differentiation of the cells induced by M-CSF and 12-O-tetradecanoylphorbol 13-acetate. These results indicate that HIV-1 Nef interferes with M-CSF receptor signaling through Hck activation and thereby inhibits M-CSF functions in monocytes/macrophages.
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