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Related Concept Videos

Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Mechanism of Angiogenesis01:10

Mechanism of Angiogenesis

Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...

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Gene-Specific Endothelial Programs Drive AVM Pathogenesis in SMAD4 and ALK1 Loss-of-Function.

Olya Oppenheim1,2,3, Wolfgang Giese1,2, Hyojin Park4

  • 1Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany (O.O., W.G., E.B., H.G.).

Arteriosclerosis, Thrombosis, and Vascular Biology
|July 16, 2026
PubMed
Summary

Mutations in SMAD4 or ALK1 cause distinct vascular malformations in hereditary hemorrhagic telangiectasia by altering endothelial cell responses to blood flow. SMAD4 deficiency enhances flow response, while ALK1 deficiency impairs it, necessitating gene-specific treatments.

Keywords:
cell polarityendothelial cellsgene expressionprecision medicineretina

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Area of Science:

  • Vascular Biology
  • Genetics
  • Molecular Biology

Background:

  • Hereditary hemorrhagic telangiectasia (HHT) is a genetic disorder linked to bone morphogenetic protein (BMP) pathway mutations.
  • Previous research often treated BMP component depletion as interchangeable, leaving the precise molecular interplay unclear.
  • Understanding the distinct roles of BMP signaling components in endothelial flow response is crucial for HHT pathogenesis.

Purpose of the Study:

  • To investigate the molecular mechanisms by which SMAD4 and ALK1 mutations contribute to arteriovenous malformations (AVMs) in HHT.
  • To differentiate the effects of SMAD4 and ALK1 loss-of-function on endothelial cell behavior and vascular development under flow conditions.

Main Methods:

  • Human endothelial cells with SMAD4 or ALK1 knockdown were subjected to laminar flow.
  • Analysis included flow-responsive transcriptomics, BMP signaling dynamics, cell polarity, morphology, and migration.
  • In vivo studies utilized postnatal mouse retina models to assess endothelial cell distribution and remodeling in mosaic settings.

Main Results:

  • SMAD4 deficiency amplified endothelial responses to flow, leading to excessive capillary pruning and large shunts.
  • ALK1 deficiency impaired flow sensing, cell polarization, and migration, promoting angiogenesis and dense vascular networks.
  • Transcriptomic analysis revealed both flow-dependent and independent changes, indicating early endothelial fate specification defects.
  • Mosaic models demonstrated mutation-specific migration behaviors and cell-cell interactions.

Conclusions:

  • SMAD4 and ALK1 mutations trigger fundamentally distinct molecular pathways in AVM formation.
  • These findings highlight the need for gene-specific diagnostic and therapeutic strategies for HHT patients.