ZFIN ID: ZDB-PUB-140321-13
MiR-144 regulates hematopoiesis and vascular development by targeting meis1 during zebrafish development
Su, Z., Si, W., Li, L., Zhou, B., Li, X., Xu, Y., Xu, C., Jia, H., and Wang, Q.K.
Date: 2014
Source: The international journal of biochemistry & cell biology   49: 53-63 (Journal)
Registered Authors: Li, Lei
Keywords: none
MeSH Terms:
  • 3' Untranslated Regions/genetics
  • Animals
  • Animals, Genetically Modified
  • Base Sequence
  • Blood Vessels/embryology
  • Blood Vessels/metabolism*
  • Blotting, Western
  • Embryo, Nonmammalian/blood supply
  • Embryo, Nonmammalian/embryology
  • Embryo, Nonmammalian/metabolism
  • GATA1 Transcription Factor/genetics
  • GATA1 Transcription Factor/metabolism
  • Gene Expression Regulation, Developmental
  • Green Fluorescent Proteins/genetics
  • Green Fluorescent Proteins/metabolism
  • HCT116 Cells
  • Hematopoiesis/genetics*
  • Homeodomain Proteins/genetics
  • Homeodomain Proteins/metabolism
  • Humans
  • In Situ Hybridization
  • MicroRNAs/genetics*
  • MicroRNAs/metabolism
  • Proto-Oncogene Proteins/genetics
  • Proto-Oncogene Proteins/metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Sequence Homology, Nucleic Acid
  • Trans-Activators/genetics
  • Trans-Activators/metabolism
  • Transcription Factors/genetics*
  • Transcription Factors/metabolism
  • Zebrafish/embryology
  • Zebrafish/genetics*
  • Zebrafish/metabolism
  • Zebrafish Proteins/genetics*
  • Zebrafish Proteins/metabolism
PubMed: 24448023 Full text @ Int. J. Biochem. Cell Biol.

Hematopoiesis is a dynamic process by which peripheral blood lineages are developed. It is a process tightly regulated by many intrinsic and extrinsic factors, including transcriptional factors and signaling molecules. However, the epigenetic regulation of hematopoiesis, for example, regulation via microRNAs (miRNAs), remains incompletely understood. Here we show that miR-144 regulates hematopoiesis and vascular development in zebrafish. Overexpression of miR-144 inhibited primitive hematopoiesis as demonstrated by a reduced number of circulating blood cells, reduced o-dianisidine staining of hemoglobin, and reduced expression of hbαe1, hbβe1, gata1 and pu.1. Overexpression of miR-144 also inhibited definitive hematopoiesis as shown by reduced expression of runx1 and c-myb. Mechanistically, miR-144 regulates hematopoiesis by repressing expression of meis1 involved in hematopoiesis. Both real-time RT-PCR and Western blot analyses showed that overexpression of miR-144 repressed expression of meis1. Bioinformatic analysis predicts a target binding sequence for miR-144 at the 32-UTR of meis1. Deletion of the miR-144 target sequence eliminated the repression of meis1 expression mediated by miR-144. The miR-144-mediated abnormal phenotypes were partially rescued by co-injection of meis1 mRNA and could be almost completely rescued by injection of both meis1 and gata1 mRNA. Finally, because meis1 is involved in vascular development, we tested the effect of miR-144 on vascular development. Overexpression of miR-144 resulted in abnormal vascular development of intersegmental vessels in transgenic zebrafish with Flk1p-EGFP, and the defect was rescued by co-injection of meis1 mRNA. These findings establish miR-144 as a novel miRNA that regulates hematopoiesis and vascular development by repressing expression of meis1.