Abstract
MicroRNAs are key regulators of hematopoiesis, specifically involved in regulating the maintenance of stemness of primitive hematopoietic progenitor cells (HPCs) and the early and late stages of hematopoietic differentiation. Some microRNAs have been found to be expressed in hematopoietic stem cells (HSCs) and primitive HPCs, and play a relevant role in regulation of the early steps of hematopoietic cell differentiation. Notable examples of these microRNAs are given by miR-22, miR-29, miR-125 and miR-126. These HSC/HPC-regulating microRNAs are often deregulated in some subsets of acute myeloid leukemia (AML), with pathogenic, diagnostic and prognostic implications. Therefore, elucidation of the pattern of microRNA expression at the level of the early stages of hematopoietic cell differentiation has essential implications, not only for elucidation of the molecular bases of the early stages of hematopoietic differentiation, but also for a better understanding of the pathogenic mechanisms underlying AML.
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