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• W2143141835 abstract "Tissue factor (TF) is a transmembrane glycoprotein that initiates the blood coagulation cascade and is also involved in cell migration, tumour metastasis and angiogenesis. Pathologic expression of tissue factor by monocytes contributes to several thrombotic complications like acute coronary artery disease and disseminated intravascular coagulation. The aim of this thesis was to investigate the clinically important pathologic expression of TF in myelo-monocytic leukaemia cells and reveal the cellular signals leading to the suppression of TF expression. The studies in this thesis indicate that TF is a marker of immature myelo-monocytic cells. Markedly higher levels of TF were expressed in immature myelo-monocytic cell lines compared to mature monocyte-like cells. Induction of terminal differentiation in immature cells resulted in down-regulation of TF expression, irrespective of the specific phenotypes induced by retinoic acid (RA) or vitamin D3 in monoblastic U-937 cells. TF suppression was also found independent of differentiation pathways, i.e. monocytic or granulocytic. The nuclear receptor activation requirements for transcriptional suppression of TF by retinoic acid (RA) were shown to differ between acute promyelocytic leukaemia (APL) NB4 and U-937 cells. In NB4 cells the binding of the agonist to the RA receptor (RAR)α alone is needed for down-regulation of TF, whereas ligand binding to both RARαand retinoic X receptor was necessary for efficient suppression of TF expression in U-937 cells. To analyse the transcriptional regulation of TF, stable NB4 and U-937 clones expressing the luciferase gene under the control of various 5' flanking regions of the TF gene were selected. Different promoter regions were found to control the basal TF transcriptional activity. Analysis of protein binding to the 140 bp promoter region, responsible for basal TF activity in NB4 cells, revealed binding of RFX-1. RA suppressed the promoter activity in NB4, but not in U-937 cells. The ectopic expression of the APL fusion proteins PML/RARα or PLZF/RARα in U-937 reporter clones were shown to confer sensitivity to RA-induced suppression of TF promoter activity. These results provide a more detailed picture of TF regulation in leukaemic and haematopoietic cells and may have a bearing on new clinical treatment strategies in APL and other leukaemias." @default.
• W2143141835 created "2016-06-24" @default.
• W2143141835 creator A5017774690 @default.
• W2143141835 date "2001-01-01" @default.
• W2143141835 modified "2023-09-24" @default.
• W2143141835 title "Regulation of Tissue Factor Expression in Myeloid and Monocytic Leukaemia Cells" @default.
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