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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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Venous thrombosis, the most common disorder of the veins, involves the formation of a thrombus or blood clot associated with vein inflammation. It can be classified as either superficial vein thrombosis or deep vein thrombosis.Superficial Vein Thrombosis: This involves the formation of a thrombus in a superficial vein, usually the greater or lesser saphenous vein. Though less severe than deep vein thrombosis (DVT), SVT can lead to complications if untreated.Deep Vein Thrombosis (DVT): This...
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Vascular Spasm01:16

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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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A Rapid and Specific Microplate Assay for the Determination of Intra- and Extracellular Ascorbate in Cultured Cells
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Intracellular Ascorbate Prevents Endothelial Barrier Permeabilization by Thrombin.

William H Parker1, Zhi-chao Qu1, James M May2

  • 1From the Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-6303.

The Journal of Biological Chemistry
|July 9, 2015
PubMed
Summary

Vitamin C (ascorbate) prevents inflammatory endothelial barrier damage by preserving intracellular cAMP levels. This maintains cell junctions and prevents harmful actin remodeling, crucial for barrier integrity.

Keywords:
Ras-related C3 botulinum toxin substrate 1 (Rac1)Ras-related protein 1 (Rap1)actinascorbatecyclic AMP (cAMP)cyclic GMP (cGMP)endothelial permeabilitynitric oxideparacellular transportthrombin

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Area of Science:

  • Endothelial biology
  • Cellular signaling
  • Inflammation research

Background:

  • Intracellular ascorbate (vitamin C) maintains endothelial barrier integrity in vitro.
  • The precise mechanisms by which ascorbate regulates endothelial permeability are not fully understood.

Purpose of the Study:

  • To investigate ascorbate's role in preventing thrombin-induced endothelial barrier permeabilization.
  • To elucidate the downstream signaling pathways affected by ascorbate during inflammation.

Main Methods:

  • Utilized human umbilical vein endothelial cells and EA.hy926 cell line.
  • Assessed endothelial permeability using inulin as a tracer.
  • Measured intracellular ascorbate, cAMP, and downstream signaling molecules (Rap1, Rac1, RhoA, MLC).

Main Results:

  • Ascorbate fully prevented thrombin-induced increases in endothelial permeability in a dose-dependent manner.
  • Ascorbate preserved intracellular cAMP levels, maintaining the actin cytoskeleton and adherens junctions.
  • Ascorbate inhibited RhoA activation and myosin light chain phosphorylation, preventing actin polymerization.

Conclusions:

  • Ascorbate plays a critical role in preventing inflammatory endothelial barrier dysfunction.
  • Ascorbate preserves barrier integrity by maintaining cAMP levels, which influences cytoskeletal dynamics and cell-cell junctions.
  • The mechanism involves nitric oxide synthase and guanylate cyclase activation, highlighting a novel signaling pathway for vitamin C.