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The Actin-Binding Protein Drebrin Inhibits Neointimal Hyperplasia.

Jonathan A Stiber1, Jiao-Hui Wu2, Lisheng Zhang2

  • 1From the Department of Medicine, Duke University Medical Center, Durham, NC (J.A.S., J.-H.W., L.Z., I.N., Z.-S.Z., V.G.B., L.B., P.B.R., N.J.F.); Department of Pathology, Duke University Medical Center, Durham, NC (R.C.B.); and MRC Centre for Developmental Neurobiology, King's College, London, UK (P.R.G.-W.). stibe001@mc.duke.edu.

Arteriosclerosis, Thrombosis, and Vascular Biology
|March 26, 2016
PubMed
Summary

Drebrin, a protein, reduces vascular smooth muscle cell activation by interacting with the actin cytoskeleton. This finding is independent of its interaction with Homer scaffolds, offering new insights into cell migration and atherosclerosis.

Keywords:
Drebrinactinhomerneointimal hyperplasiasmooth muscle

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Area of Science:

  • Vascular biology
  • Cellular and molecular medicine
  • Biochemistry

Background:

  • Vascular smooth muscle cell (SMC) migration is crucial for vascular health and is influenced by cytoskeletal dynamics and transient receptor potential (TRP) channels.
  • The scaffolding protein Homer 1 is essential for TRPC channel function and interacts with the actin-binding protein Drebrin.
  • Drebrin expression is elevated in atherosclerosis and following vascular injury, suggesting a role in SMC activation.

Purpose of the Study:

  • To investigate the role of Drebrin in regulating SMC activation.
  • To determine if Drebrin modulates TRP channel function via Homer or directly impacts the actin cytoskeleton.

Main Methods:

  • Wire-mediated carotid endothelial denudation in wild-type and Drebrin-deficient mice.
  • Assessment of neointimal hyperplasia, actin dynamics (globular and filamentous actin), TRP channel activity, SMC migration, and proliferation.
  • Adenoviral-mediated rescue expression of Drebrin in SMCs.

Main Results:

  • Drebrin-deficient mice exhibited significantly greater neointimal hyperplasia compared to wild-type controls.
  • SMCs lacking Drebrin showed reduced filamentous actin, increased TRP channel activity, migration, and proliferation.
  • Rescue expression of Drebrin normalized these aberrant cellular responses.

Conclusions:

  • Drebrin mitigates SMC activation by directly interacting with the actin cytoskeleton.
  • This inhibitory effect on SMC activation is independent of Drebrin's interaction with Homer scaffolds.
  • These findings highlight Drebrin's critical role in maintaining vascular homeostasis and suggest potential therapeutic targets for atherosclerosis.