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Related Concept Videos

Coagulation01:06

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒  small G-proteins consisting of a single domain and large multi-domain G-proteins.
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Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
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Paraoxonase-2 regulates coagulation activation through endothelial tissue factor.

Julia Ebert1,2, Petra Wilgenbus1,2, John F Teiber3

  • 1Center for Thrombosis and Hemostasis and.

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Paraoxonase-2 (PON2) deficiency in mice increases vascular inflammation and blood clotting by elevating oxidative stress and tissue factor. Restoring PON2 normalizes these prothrombotic states, highlighting its protective role in cardiovascular health.

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Area of Science:

  • Cardiovascular Biology
  • Redox Biology
  • Thrombosis and Hemostasis

Background:

  • Oxidative stress and vascular inflammation are key factors in prothrombotic states.
  • Reduced paraoxonase-2 (PON2) expression is observed in atherosclerotic plaques and endothelial cells.
  • PON2 deficiency in mice promotes atherosclerosis via unclear mechanisms.

Purpose of the Study:

  • To investigate the role of PON2 deficiency in vascular inflammation and blood coagulation.
  • To elucidate the redox-dependent mechanisms linking PON2 to endothelial dysfunction and prothrombotic states.

Main Methods:

  • Utilized Pon2 knockout mice and bone marrow transplantation models.
  • Assessed oxidative stress, endothelial dysfunction, and inflammation (interleukin-6).
  • Measured tissue factor (TF) activity, coagulation times, and platelet procoagulant activity in vitro and in vivo.

Main Results:

  • Pon2 deficiency led to increased oxidative stress, endothelial dysfunction, and vascular inflammation originating from the vasculature.
  • Endothelial cells from Pon2 mice showed elevated tissue factor (TF) activity, shortening coagulation times.
  • Anti-TF treatment and PON2 restoration (via gene correction or antioxidant therapy) normalized the procoagulant phenotype.

Conclusions:

  • PON2 deficiency deregulates redox balance, promoting vascular inflammation and TF-driven hypercoagulability.
  • PON2 acts as a critical redox-dependent regulator of endothelial TF activity, preventing systemic coagulation and inflammation.
  • Restoration of PON2 function mitigates prothrombotic states, underscoring its therapeutic potential in cardiovascular disease.