Angiopoietin-like proteins stimulate HSPC development through interaction with Notch receptor signaling

Michelle I. Lin, Emily N. Price, Sonja Boatman, Elliott J. Hagedorn, Eirini Trompouki, Sruthi Satishchandran, Charles W. Carspecken, Audrey Uong, Anthony DiBiase, Song Yang, Matthew C. Canver, Ann Dahlberg, Zhigang Lu, Cheng Cheng Zhang, Stuart H. Orkin, Irwin D. Bernstein, Jon C. Aster, Richard M. White, Leonard I. Zon

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Angiopoietin-like proteins (angptls) are capable of ex vivo expansion of mouse and human hematopoietic stem and progenitor cells (HSPCs). Despite this intriguing ability, their mechanism is unknown. Here, we show that angptl2 overexpression is sufficient to expand definitive HSPCs in zebrafish embryos. Angptl1/2 are required for definitive hematopoiesis and vascular specification of the hemogenic endothelium. The loss-of-function phenotype is reminiscent of the notch mutant mindbomb (mib) and a strong genetic interaction occurs between angptls and notch. Overexpressing angptl2 rescues mib while overexpressing notch rescues angptl1/2 morphants. Gene expression studies in Angptl2-stimulated CD34+ cells showed a strong Myc activation signature and myc overexpression in angptl1/2 morphants or mib restored HSPCs formation. Angptl2 can increase Notch activation in cultured cells and Angptl receptor interacted with Notch to regulate Notch cleavage. Together our data provide insight to the angptl-mediated notch activation through receptor interaction and subsequent activation of myc targets.

Original languageEnglish (US)
Article numbere05544
Issue number4
StatePublished - Feb 25 2015
Externally publishedYes

ASJC Scopus subject areas

  • General Neuroscience
  • General Biochemistry, Genetics and Molecular Biology
  • General Immunology and Microbiology


Dive into the research topics of 'Angiopoietin-like proteins stimulate HSPC development through interaction with Notch receptor signaling'. Together they form a unique fingerprint.

Cite this