Related Experiment Video
Updated: Mar 21, 2026
10:28
Development of an In Vitro Assay to Quantitate Hematopoietic Stem and Progenitor Cells HSPCs in Developing Zebrafish Embryos
Published on: November 30, 2017
8.4K
Cyp2aa9 regulates haematopoietic stem cell development in zebrafish
Jingying Chen1, Jianbo He1, Li Li1
1Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, Laboratory of Molecular Developmental Biology, School of Life Sciences, Southwest University, Beibei, 400715 Chongqing, China.
Scientific Reports
|May 21, 2016
Summary
A novel zebrafish gene, Cyp2aa9, is crucial for forming definitive hematopoietic stem cells (HSCs). Its deficiency reduces prostaglandin E2 (PGE2) levels, impairing HSC development, which can be restored by PGE2 administration.
Area of Science:
- Developmental Biology
- Hematopoiesis
- Molecular Biology
Background:
- Definitive hematopoiesis continuously replenishes blood and immune cells throughout life.
- Formation of hematopoietic stem cells (HSCs) during embryonic development is a complex process regulated by various factors.
- The specific roles of cytochrome P450 (CYP) 2 family members in hematopoiesis are not well understood.
Purpose of the Study:
- To characterize a novel zebrafish Cyp2 family member, Cyp2aa9.
- To investigate the function of Cyp2aa9 in HSC formation and homeostasis.
- To elucidate the molecular mechanisms by which Cyp2aa9 influences HSC development.
Main Methods:
- Characterization and functional studies of the zebrafish Cyp2aa9 gene.
- Antisense morpholino oligonucleotide-mediated knockdown of cyp2aa9.
- Assessment of definitive HSC development and Wnt/β-catenin activity.
- Rescue experiments using prostaglandin E2 (PGE2) and its precursors.
- Measurement of in vivo PGE2 levels.
Main Results:
- Knockdown of cyp2aa9 resulted in defective definitive HSC development and reduced Wnt/β-catenin activity.
- Administration of PGE2 rescued the impaired HSC formation in cyp2aa9 morphants via the cAMP/PKA pathway.
- In vivo PGE2 levels were decreased in cyp2aa9 morphants.
- PGE2 precursors could not rescue the observed phenotypes.
Conclusions:
- Cyp2aa9 is essential for definitive HSC formation and homeostasis in zebrafish.
- Cyp2aa9 functions in the prostaglandin E2 (PGE2) synthesis pathway, specifically in the conversion of PGH2 to PGE2.
- Cyp2aa9 promotes Wnt activation, which is critical for definitive HSC development.
