Regulation of Erythroid Differentiation by MiR-376a and Its Targets

Overview

Journal Cell Res

Specialty Cell Biology

Date 2011 May 11

PMID 21556037

Citations 31

Authors

Fang Wang

Jia Yu

Gui-Hua Yang

Xiao-Shuang Wang

Jun-Wu Zhang

Affiliations

Soon will be listed here.

Abstract

Lineage differentiation is a continuous process during which fated progenitor cells execute specific programs to produce mature counterparts. This lineage-restricted pathway can be controlled by particular regulators, which are usually exclusively expressed in certain cell types or at specific differentiation stages. Here we report that miR-376a participates in the regulation of the early stages of human erythropoiesis by targeting cyclin-dependent kinase 2 (CDK2) and Argonaute 2 (Ago2). Among various human leukemia cell lines, miR-376a was only detected in K562 cells which originated from a progenitor common to the erythroid and megakaryotic lineages. Enforced expression of miR-376a or silencing of CDK2 and Ago2 by RNAi inhibits erythroid differentiation of K562 cells. Hematopoietic progenitor cells transduced with miR-376a showed a significant reduction of their erythroid clonogenic capacity. MiR-376a is relatively abundant in erythroid progenitor cells, where it reduces expression of CDK2 and maintains a low level of differentiation due to cell cycle arrest and decreased cell growth. Following erythroid induction, miR-376a is significantly down-regulated and CDK2 is released from miR-376a inhibition, thereby facilitating the escape of progenitor cells from the quiescent state into erythroid differentiation. Moreover, our results establish a functional link between miR-376a and Ago2, a key factor in miRNA biogenesis and silencing pathways with novel roles in human hematopoiesis.

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