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• W1966111502 endingPage "3263" @default.
• W1966111502 startingPage "3256" @default.
• W1966111502 abstract "Abstract Hydroxyurea (HU), a drug effective in the treatment of sickle cell disease, is thought to indirectly promote fetal hemoglobin (Hb F) production by perturbing the maturation of erythroid precursors. The molecular mechanisms involved in HU-mediated regulation of γ-globin expression are currently unclear. We identified an HU-induced small guanosine triphosphate (GTP)–binding protein, secretion-associated and RAS-related (SAR) protein, in adult erythroid cells using differential display. Stable SAR expression in K562 cells increased γ-globin mRNA expression and resulted in macrocytosis. The cells appeared immature. SAR-mediated induction of γ-globin also inhibited K562 cell growth by causing arrest in G1/S, apoptosis, and delay of maturation, cellular changes consistent with the previously known effects of HU on erythroid cells. SAR also enhanced both γ- and β-globin transcription in primary bone marrow CD34+ cells, with a greater effect on γ-globin than on β-globin. Although up-regulation of GATA-2 and p21 was observed both in SAR-expressing cells and HU-treated K562 cells, phosphatidylinositol 3 (PI3) kinase and phosphorylated ERK were inhibited specifically in SAR-expressing cells. These data reveal a novel role of SAR distinct from its previously known protein-trafficking function. We suggest that SAR may participate in both erythroid cell growth and γ-globin production by regulating PI3 kinase/extracellular protein–related kinase (ERK) and GATA-2/p21-dependent signal transduction pathways." @default.
• W1966111502 created "2016-06-24" @default.
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• W1966111502 date "2005-11-01" @default.
• W1966111502 modified "2023-09-27" @default.
• W1966111502 title "The hydroxyurea-induced small GTP-binding protein SAR modulates γ-globin gene expression in human erythroid cells" @default.
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• W1966111502 doi "https://doi.org/10.1182/blood-2003-10-3458" @default.
• W1966111502 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1895330" @default.
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