Abstract
Exogenous expression of the transcription factor Scl (Tal1) in WEHI-3B D+ myelomonocytic leukemia cells interferes with their capacity to respond to all-trans retinoic acid (ATRA) induced differentiation; combination of ATRA with LiCl, however, circumvents the inhibition of differentiation produced by Scl. To gain information on the possible involvement of this transcription factor in the non-responsiveness of acute myelocytic leukemia (AML) patients to ATRA, we compared the endogenous expression levels of Scl and its transcription complex partners [i.e., Rbtn1 (LMO1), Rbtn2 (LMO2), Ldb1, and GATA family proteins] in leukemic blast cells from patients with AML and acute promyelocytic leukemia (APL), and determined the effects of lithium chloride alone or in combination with ATRA on the capacity of blast cells to differentiate during short-term ex vivo culture. Levels of Scl, Rbtn2, GATA1, and Ldb1 expression were comparable in AML and APL blasts, while the levels of expression of Rbtn1, GATA2, and GATA3 were absent or markedly lower in APL cells. Differentiation markers (cell surface myeloid antigens CD11b, CD15, CD14, and CD33) were also analyzed in blast cells. ATRA produced changes in at least one surface antigen differentia...Continue Reading
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