Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 364, Issue 3, Pages 509-514Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2007.10.077
Keywords
MicroRNA; erythropoiesis; MiRNA-155; MiRNA-451; quantitative real-time polymerase chain reaction; blood cell; liquid culture system; progenitor; human; differentiation
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To clarify the roles of microRNAs (miRNAs) in erythropoiesis, the expression of miR-155, miR-221, miR-223, and miR-451 were analyzed during the differentiation of purified normal human erythroid progenitors in a liquid culture system. Cells increased almost 500-fold in a number, and differentiated to benzidine-positive mature erythroblasts. Analyses of miRNA expression using the quantitative real-time polymerase chain reaction showed that the expression level of miR-155 decreased about 200-fold, and that the expression of iniR-451 increased about 270-fold during 12 days of cultures. A moderate down-regulation of miR-221 and miR-223 was observed. MiR-451 was expressed in red blood cells about 10(4)-fold more than in granulocytes, obtained from normal human peripheral blood. These observations suggest that miR-155 and miR-451 are key molecules for normal erythroid differentiation, and that quantitative assays of the two miRNAs may be a relevant method for analyzing pathological erythropoiesis. (C) 2007 Elsevier Inc. All rights reserved.
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