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Related Concept Videos

Development of Blood Vessels01:07

Development of Blood Vessels

The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...

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Isolation of Murine Embryonic Hemogenic Endothelial Cells
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CD32 captures committed haemogenic endothelial cells during human embryonic development.

Rebecca Scarfò1, Lauren N Randolph1, Monah Abou Alezz1

  • 1San Raffaele Telethon Institute for Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan, Italy.

Nature Cell Biology
|April 9, 2024
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Summary

Researchers identified CD32 (FCGR2B) as a marker for haemogenic endothelial cells (HECs) in human embryos. This discovery enables precise isolation of HECs for efficient hematopoietic cell generation in vitro.

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Area of Science:

  • Developmental Biology
  • Hematopoiesis
  • Cell Biology

Background:

  • Blood cells originate from specialized endothelial cells called haemogenic endothelial cells (HECs).
  • HECs are rare and transient in early human embryos, making them difficult to distinguish from other endothelial cells.

Purpose of the Study:

  • To identify a reliable marker for isolating haemogenic endothelial cells (HECs) from human embryos.
  • To understand the developmental trajectory of HECs and their commitment to hematopoiesis.

Main Methods:

  • Transcriptomic analysis of human embryonic endothelial cells (28- to 32-day embryos).
  • Functional assays using human embryonic stem cell-derived endothelial cells.
  • Flow cytometry for identifying CD32 expression on endothelial cells.

Main Results:

  • Fc receptor CD32 (FCGR2B) expression is highly enriched in endothelial cells containing HECs.
  • CD32-positive (CD32+) endothelial cells exhibit robust multilineage hematopoietic potential.
  • 90% of CD32+ endothelial cells were identified as bona fide HECs.
  • FCGR2B expression marks an irreversible commitment point for HECs towards a hematopoietic fate.

Conclusions:

  • CD32 is a precise marker for isolating HECs from human embryonic and pluripotent stem cell-derived endothelial cells.
  • This finding facilitates the efficient in vitro generation of hematopoietic cells.