Search results for: CD230 _ Human Prion Protein (PrP)
#22076653 
2011/11/11
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Functional mechanisms of the cellular prion protein (PrP(C)) associated anti-HIV-1 properties.
The cellular prion protein PrP(C)/CD230 is a GPI-anchor protein highly expressed in cells from the nervous and immune systems and well conserved among vertebrates. In the last decade, several studies suggested that PrP(C) displays antiviral properties by restricting the replication of different viruses, and in particular retroviruses such as murine leukemia virus (MuLV) and the human immunodeficiency virus type 1 (HIV-1). In this context, we previously showed that PrP(C) displays important similarities with the HIV-1 nucleocapsid protein and found that PrP(C) expression in a human cell line strongly reduced HIV-1 expression and virus production. Using different PrP(C) mutants, we report here that the anti-HIV-1 properties are mostly associated with the amino-terminal 24-KRPKP-28 basic domain. In agreement with its reported RNA chaperone activity, we found that PrP(C) binds to the viral genomic RNA of HIV-1 and negatively affects its translation. Using a combination of biochemical and cell imaging strategies, we found that PrP(C) colocalizes with the virus assembly machinery at the plasma membrane and at the virological synapse in infected T cells. Depletion of PrP(C) in infected T cells and microglial cells favors HIV-1 replication, confirming its negative impact on the HIV-1 life cycle.Sandrine Alais, Ricardo Soto-Rifo, Vincent Balter, Henri Gruffat, Evelyne Manet, Laurent Schaeffer, Jean Luc Darlix, Andrea Cimarelli, Graça Raposo, Théophile Ohlmann, Pascal Leblanc
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#19843289 2009/10/15
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Increase in CD230 (cellular prion protein) fluorescence on blood lymphocytes in bovine spongiform encephalopathy-infected nonhuman primates.
The cellular prion protein (PrP(c)) plays a central role in prion diseases such as variant Creutzfeldt-Jakob disease. This disease can be transmitted by blood transfusion. However, the exact kinetics of blood infectivity and the blood fraction carrying infectivity have not yet been identified.Edgar Holznagel, Barbara Yutzy, Walter Schulz-Schaeffer, Kay-Martin Hanschman, Andreas Stuke, Uwe Hahmann, Mechthild Törner, Cheick Coulibaly, Andreas Hoffmann, Gerhard Hunsmann, Johannes Löwer