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  • Title: Productive infection of CD34+-cell-derived megakaryocytes by X4 and R5 HIV-1 isolates.
    Author: Voulgaropoulou F, Pontow SE, Ratner L.
    Journal: Virology; 2000 Mar 30; 269(1):78-85. PubMed ID: 10725200.
    Abstract:
    The human immunodeficiency virus (HIV-1) causes various hematopoietic abnormalities, with thrombocytopenia (TP) occurring in 30% of infected individuals. In the present study, we aimed to determine whether HIV-1 in the bone marrow of TP patients can infect primary megakaryocytes in vitro, which may contribute to the development of thrombocytopenia. We amplified the V3 loop of HIV-1 envelope from the bone marrow of TP and non-TP patients and constructed recombinant viruses. We demonstrate that the bone marrow of TP and non-TP patients contained R5 strains, whereas X4 strains were present only in the bone marrow of TP patients. Furthermore, HIV-1 from the bone marrow of TP and non-TP patients infected megakaryocytes to similar levels, suggesting that the V3 loop of HIV-1 may not contain the viral determinants of HIV-associated TP. Chemokine receptor analysis determined that CD34+-cell-derived megakaryocytes express CD4, CXCR4, and CCR5 and are productively infected by both X4 and R5 HIV-1 isolates. Finally, we showed that CD34+-cell-derived megakaryocytes express the chemokine receptor CCR3.
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