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Reducing Hypermuscularization of the Transitional Segment Between Arterioles and Capillaries Protects Against

Julien Ratelade1, Nicholas R Klug2, Damiano Lombardi3

  • 1Institute of Psychiatry and Neurosciences of Paris (IPNP), Inserm U1266, University of Paris, France (J.R., M.K.S.C.A., V.D-D., A.J.).

Circulation
|March 19, 2020
PubMed

Insights

Deep intracerebral hemorrhage (ICH) involves two vascular defects: transitional segment hypermuscularization and smooth muscle cell loss. This dual defect, driven by Notch3, increases pressure and promotes rupture, offering new insights into stroke mechanisms.

Area of Science:

  • Vascular Biology
  • Neurology
  • Genetics

Background:

  • Spontaneous deep intracerebral hemorrhage (ICH) is a severe stroke subtype lacking targeted treatments.
  • Current theories suggest smooth muscle cell (SMC) degeneration causes ICH, but this doesn't explain rarity in some small vessel diseases with SMC loss.
  • A second cellular defect is hypothesized to be necessary for ICH development.

Purpose of the Study:

  • To investigate the underlying cellular mechanisms of spontaneous deep ICH.
  • To identify potential genetic and cellular factors contributing to ICH pathogenesis.
  • To explore the role of collagen type IV mutations in cerebrovascular integrity.

Main Methods:

  • Utilized genetic mouse models (Col4a1 mutant lines) to study spontaneous deep ICH.
  • Analyzed cerebroretinal microvessels, conducted genetic rescue, vascular reactivity tests, and computational modeling.
  • Examined postmortem brain tissues from human patients with sporadic deep ICH.

Main Results:

  • Identified a novel transitional segment (TS) between arterioles and capillaries, distinct from SMCs and pericytes.
  • Col4a1 mutant mice exhibited TS hypermuscularization and upstream arteriolar SMC loss.
  • Increased Notch3 activity in the TS contributed to ICH by raising intravascular pressure and promoting arteriole rupture.

Conclusions:

  • TS hypermuscularization, mediated by Notch3, is a key factor in ICH development in Col4a1 mutant mice.
  • This process elevates intravascular pressure, leading to rupture at sites of SMC loss.
  • The combination of TS hypermuscularization and arteriolar SMC loss represents a potential general mechanism for deep ICH in humans.
Abstract

Keywords:
Notch3 protein, mousecerebral hemorrhagecollagen type IVmyocytes, smooth muscle

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