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Impaired in vitro growth of purified (CD34+) hematopoietic progenitors in
human immunodeficiency virus-1 seropositive thrombocytopenic individuals
G Zauli, MC Re, B Davis, L Sen, G Visani, L Gugliotta, G Furlini and M La Placa
Institute of Microbiology, University of Bologna, Italy.
In this report the role played by human immunodeficiency virus type-1
(HIV-1) in the pathogenesis of HIV-1-related thrombocytopenia was
investigated. CD34+ hematopoietic stem/progenitor cells were purified from
the bone marrow (BM) of HIV-1(+) thrombocytopenic patients, HIV- 1(+)
nonthrombocytopenic individuals, HIV-1(-) patients with immune
thrombocytopenic purpura, and HIV-1(-) normal donors. CD34+ cells from
HIV-1(+) thrombocytopenic individuals alone showed a reduced capacity to
give rise to megakaryocytic colonies (CFU-Meg) and also a progressive and
significant decline in cell number when placed in liquid culture containing
recombinant human interleukin-3 (rIL-3). This decline involved not only
megakaryocyte but also erythroid and granulocyte/macrophage progenitors.
The defects in megakaryocyte colony formation and CD34+ cell growth did not
result from a productive HIV-1 infection of CD34+ cells. Moreover, HIV-1
DNA was absent from CD34+ cells in 10 of 12 thrombocytopenic patients
examined. On the other hand, the decreased survival/proliferation of CD34+
cells in liquid culture, within the HIV-1(+) thrombocytopenic patients, was
correlated with the presence of HIV-1 p24 antigen in BM plasma. These
results demonstrate an impairment of CD34+ cells in HIV-1(+) individuals
presenting thrombocytopenia as the only hematologic manifestation.
Furthermore, these findings suggest that increased viral replication in the
BM microenvironment may cause this impairment and possibly contributes to
HIV-induced thrombocytopenia.
Volume 79,
Issue 10,
pp. 2680-2687,
05/15/1992
Copyright © 1992 by The American Society of Hematology

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