HIV-1 V3 loop clones of virus isolates derived from patients suffering from thrombocytopenia were used for infection of the human thymus/liver conjoint hematopoietic organ that developed in the severe combined immunodeficient mouse (SCID-hu Thy/Liv). The V3 loop clones showed a significantly greater degree of inhibition of megakaryopoiesis than myelopoiesis and erythropoiesis of the human CD34+ progenitor cells, in vivo. Inhibition of megakaryopoiesis occurs through reduction in c-Mpl expression and consequent decrease in STAT5 activation. Therefore HIV-1 V3 loop sequences of thrombocytopenic patients exhibit preferential inhibition of megakaryocyte lineage-specific differentiation of CD34+ progenitor cells, thus reflecting the patients' clinical condition. © 2010 Elsevier Inc.
Zhang, M., Evans, S., Yuan, J., Ratner, L., & Koka, P. S. (2010). HIV-1 determinants of thrombocytopenia at the stage of CD34+ progenitor cell differentiation in vivo lie in the viral envelope gp120 V3 loop region. Virology, 401(2), 131–136. https://doi.org/10.1016/j.virol.2010.03.005