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Context Dependent Sulf1/Sulf2 Functional Divergence in Endothelial Cell Activity.

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Summary
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SULF1 and SULF2 enzymes differently regulate cell signaling by modifying heparan sulfate proteoglycans (HSPGs). Their distinct roles in endothelial cells impact vascular endothelial growth factor (VEGF) and transforming growth factor beta (TGFβ) signaling pathways.

Keywords:
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Cellular signaling relies on tightly regulated activities.
  • Heparan sulfate proteoglycans (HSPGs) modulate cell surface receptor interactions and ligand availability.
  • SULF1 and SULF2 enzymes are known to modify HSPG sulfation, but their specific roles are not fully understood.

Purpose of the Study:

  • To investigate the distinct regulatory roles of SULF1 and SULF2 enzymes in human endothelial cells.
  • To elucidate the impact of SULF1 and SULF2 on heparan sulfate (HS) sulfation patterns and associated signaling pathways.
  • To examine the differential effects of SULF1 and SULF2 on vascular endothelial growth factor (VEGF) and transforming growth factor beta (TGFβ) signaling.

Main Methods:

  • In vitro mRNA and protein analyses were performed on two diverse human endothelial cell lines (HMec1 and ea926).
  • Over-expression of SULF1 and SULF2 was utilized to assess their effects on cell signaling.
  • Analysis included evaluating HS 6-O transferase (HS6ST) activities and responses to VEGF-A and TGFβ1, including their inhibitors.

Main Results:

  • SULF1 and SULF2 exhibit distinct roles in maintaining specific HSPG sulfation patterns through feedback regulation of HS6ST activities.
  • In dermal microvascular HMec1 cells, Sulf1 over-expression promotes TGFβ and VEGF signaling by upregulating HS6ST1 activity.
  • In venous ea926 cells, Sulf1 over-expression attenuates TGFβ and VEGF signaling, while Sulf2 over-expression maintains the control phenotype. Alternative Sulf2 RNA splicing also influences signaling.

Conclusions:

  • SULF1 and SULF2 enzymes possess markedly distinct regulatory functions in endothelial cells, contrary to previous assumptions of functional identity.
  • Endothelial cell type-specific responses to growth factors (VEGF, TGFβ) are intricately linked to HSPG sulfation regulation by SULF enzymes.
  • These findings highlight the complex interplay between HSPG sulfation, SULF enzyme activity, and growth factor signaling, with implications for understanding cellular communication.