Proangiogenic Properties of Thrombospondin-4

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Santoshi Muppala1, Ella Frolova1, Roy Xiao1

  • 1From the Department of Molecular Cardiology (S.M., E.F., R.X., I.K., E.P., O.S.-A.), and Cole Eye Institute (S.Y., G.H.), Cleveland Clinic, OH; and ImageIQ Inc, Cleveland, OH (A.V.).

Arteriosclerosis, Thrombosis, and Vascular Biology
|July 4, 2015
PubMed
Abstract

Insights

Thrombospondin-4 (TSP-4) is a newly identified proangiogenic protein. This extracellular matrix protein promotes blood vessel growth by enhancing endothelial cell adhesion, migration, and proliferation.

Area of Science:

  • Vascular biology
  • Extracellular matrix proteins
  • Angiogenesis

Background:

  • Thrombospondin-4 (TSP-4) is a member of the thrombospondin family, with TSP-1 and TSP-2 known for antiangiogenic properties.
  • TSP-4 is found in the vascular matrix, particularly in capillaries, suggesting a role in blood vessel formation.
  • The angiogenic potential of TSP-4 and related family members has remained largely unexplored.

Purpose of the Study:

  • To investigate the function of Thrombospondin-4 (TSP-4) in regulating angiogenesis.
  • To determine if TSP-4 exhibits proangiogenic or antiangiogenic activity.
  • To identify the cellular mechanisms and receptors involved in TSP-4's angiogenic effects.

Main Methods:

  • Utilized Thbs4(-/-) knockout mice and their derived endothelial cells (EC) to assess angiogenesis in vivo and in vitro.
  • Employed recombinant TSP-4 to study its direct effects on EC.
  • Investigated the role of specific receptors, including integrin α2 and gabapentin receptor α2δ-1, in TSP-4 mediated endothelial cell functions.

Main Results:

  • Angiogenesis was significantly reduced in Thbs4(-/-) mice compared to wild-type controls.
  • TSP-4 was observed within the lumen of developing blood vessels.
  • Endothelial cells from Thbs4(-/-) mice showed impaired adhesion, migration, and proliferation; recombinant TSP-4 reversed these deficits.
  • A specific TSP-4 variant (P387) demonstrated enhanced angiogenic activity compared to the A387 form.
  • Integrin α2 and gabapentin receptor α2δ-1 were identified as key mediators of TSP-4's effects on EC.

Conclusions:

  • Thrombospondin-4 (TSP-4) possesses significant proangiogenic activity.
  • TSP-4 promotes angiogenesis by directly stimulating endothelial cell adhesion, migration, and proliferation.
  • Integrin α2 and gabapentin receptor α2δ-1 are crucial receptors mediating TSP-4's proangiogenic functions.
Keywords:
angiogenesisextracellular matrixthrombospondin-4

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