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Related Concept Videos

Vascular Spasm01:16

Vascular Spasm

2.6K
The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last...
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Postresuscitation Cerebral Vasospasm and Capillary Failure After Experimental Asphyxial Cardiac Arrest.

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Related Experiment Video

Updated: Nov 6, 2025

A Mouse Model of Retinal Ischemia-Reperfusion Injury Through Elevation of Intraocular Pressure
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Does Src Kinase Mediated Vasoconstriction Impair Penumbral Reperfusion?

Halvor Osterby Guldbrandsen1, Christian Staehr1, Nina Kerting Iversen2

  • 1Department of Biomedicine, MEMBRANES, Health (H.O.G., C.S., V.V.M.), Aarhus University, Denmark.

Stroke
|May 5, 2021
PubMed
Summary

Impaired reperfusion after ischemic stroke may stem from constricted brain arterioles. This study identifies Na,K-ATPase-dependent Src kinase activation as a key mechanism causing this arteriolar hypercontractility, impacting blood flow recovery.

Keywords:
blood-brain barrierhomeostasisischemic strokereperfusionsmooth musclesodium-potassium-exchanging ATPasesrc-family kinases

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Area of Science:

  • Neuroscience
  • Cardiovascular Research
  • Cellular Signaling

Background:

  • Successful recanalization in ischemic stroke often fails to restore adequate brain tissue reperfusion.
  • Existing research focuses on blood-brain barrier dysfunction and capillary flow, overlooking arteriolar constriction.
  • Cerebral arterioles are critical for regulating brain perfusion, and their dysfunction can limit reperfusion post-stroke.

Purpose of the Study:

  • To investigate the underlying molecular mechanisms of elevated cerebrovascular tone after reperfusion in ischemic stroke.
  • To propose and explore the role of Na,K-ATPase-dependent Src kinase activation in arteriolar hypercontractility.
  • To link this mechanism to impaired reperfusion and potential integration with cerebral edema.

Main Methods:

  • The study proposes a mechanism involving Na,K-ATPase endocytosis from vascular smooth muscle cells under hypoxic conditions.
  • This process is suggested to initiate Src kinase signaling, sensitizing the contractile machinery to intracellular calcium.
  • The proposed mechanism integrates with existing theories on cerebral edema contributing to reperfusion deficits.

Main Results:

  • A significant number of ischemic stroke patients experience impaired reperfusion despite successful recanalization.
  • Elevated cerebrovascular tone post-reperfusion is observed, but its mechanism remains unclear.
  • Conventional mechanisms fail to fully explain the increased vascular tone after reperfusion.

Conclusions:

  • Na,K-ATPase-dependent Src kinase activation is proposed as the key mechanism responsible for elevated cerebrovascular tone post-reperfusion.
  • This pathway leads to vascular smooth muscle cell hypercontractility, contributing to impaired reperfusion.
  • Further research is needed to definitively demonstrate the molecular mechanism of Src kinase-associated arteriolar hypercontractility in stroke.