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• W2317605718 abstract "Abstract In this study, we examined the potential role of the human immunodeficiency virus (HIV) tat protein in causing the hematopoietic abnormalities frequently observed in HIV-infected individuals. Recombinant tat (r-tat) protein, at concentrations up to 10 micrograms/mL, did not display any stimulatory or inhibitory effect on the survival/proliferative capacity of CD34+ hematopoietic progenitor cells, purified from normal bone marrow (BM). However, exposure of r-tat protein (at concentrations between 10 ng/mL and 10 micrograms/mL) to enriched normal BM macrophages induced the production of a factor(s) in conditioned media that inhibited the in vitro growth of CD34+ cells in liquid cultures and of immature hematopoietic progenitors (day 14 colony-forming unit-granulocyte-macrophage, burst-forming unit-erythroid, and colony-forming unit-megakaryocyte) in semisolid assays. Pre-exposure of r-tat protein with a monoclonal neutralizing anti-tat antibody completely abrogated the inhibitory activity present in BM macrophage culture supernatants. The main factor responsible for this suppressive activity was transforming growth factor-beta 1 (TGF-beta 1), as shown by the ability of a polyclonal anti-TGF-beta 1 neutralizing antibody to almost completely reverse the suppressive effect of BM macrophage supernatants on CD34+ cells. TGF-beta 1 bioassays showed that exposure of r-tat protein to BM macrophages significantly increased the levels of both active and latent forms of TGF-beta 1. These results indicate that the production of TGF-beta 1, one of the most potent negative regulator of hematopoiesis, is increased by HIV tat protein and that such increase could contribute to the derangement of the hematopoietic system in HIV-infected individuals." @default.
• W2317605718 created "2016-06-24" @default.
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• W2317605718 date "1992-12-15" @default.
• W2317605718 modified "2023-09-30" @default.
• W2317605718 title "tat protein stimulates production of transforming growth factor-beta 1 by marrow macrophages: a potential mechanism for human immunodeficiency virus-1-induced hematopoietic suppression" @default.
• W2317605718 doi "https://doi.org/10.1182/blood.v80.12.3036.3036" @default.
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