ZFIN ID: ZDB-PUB-161103-1
Wnt9a Is Required for the Aortic Amplification of Nascent Hematopoietic Stem Cells
Grainger, S., Richter, J., Palazón, R.E., Pouget, C., Lonquich, B., Wirth, S., Grassme, K.S., Herzog, W., Swift, M.R., Weinstein, B.M., Traver, D., Willert, K.
Date: 2016
Source: Cell Reports 17: 1595-1606 (Journal)
Registered Authors: Grassme, Kathrin, Herzog, Wiebke, Swift, Matthew Russell, Traver, David, Weinstein, Brant M.
Keywords: HSCs, HSPCs, Myc, Wnt, Wnt9a, aorta, hematopoietic stem and progenitor cells, hematopoietic stem cells, proliferation
MeSH Terms:
  • Animals
  • Aorta/cytology*
  • Aorta/embryology*
  • Cell Count
  • Cell Cycle
  • Cell Proliferation
  • Hemangioblasts/metabolism
  • Hematopoietic Stem Cells/cytology*
  • Hematopoietic Stem Cells/metabolism*
  • Wnt Proteins/metabolism*
  • Wnt Signaling Pathway
  • Zebrafish/embryology*
  • Zebrafish Proteins/metabolism*
PubMed: 27806298 Full text @ Cell Rep.
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ABSTRACT
All mature blood cell types in the adult animal arise from hematopoietic stem and progenitor cells (HSPCs). However, the developmental cues regulating HSPC ontogeny are incompletely understood. In particular, the details surrounding a requirement for Wnt/β-catenin signaling in the development of mature HSPCs are controversial and difficult to consolidate. Using zebrafish, we demonstrate that Wnt signaling is required to direct an amplification of HSPCs in the aorta. Wnt9a is specifically required for this process and cannot be replaced by Wnt9b or Wnt3a. This proliferative event occurs independently of initial HSPC fate specification, and the Wnt9a input is required prior to aorta formation. HSPC arterial amplification occurs prior to seeding of secondary hematopoietic tissues and proceeds, in part, through the cell cycle regulator myca (c-myc). Our results support a general paradigm, in which early signaling events, including Wnt, direct later HSPC developmental processes.
ADDITIONAL INFORMATIONNo data available