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Formation of the Platelet Plug

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...

Structure and Function of Platelets

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...

Clot Retraction and Fibrinolysis

Clot Retraction and Fibrinolysis

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.

Introduction to Hemostasis

Introduction to Hemostasis

Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
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Vascular Spasm

Vascular Spasm

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Formation of Blood Clot
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Related Experiment Video

Updated: May 25, 2026

Visualization of Neutrophil Extracellular Traps in Mesenteric Venules After Mesenteric Ischemia-Reperfusion Injury via Intravital Microscopy

Visualization of Neutrophil Extracellular Traps in Mesenteric Venules After Mesenteric Ischemia-Reperfusion Injury via Intravital Microscopy

Published on: September 27, 2024

Platelets orchestrate remote tissue damage after mesenteric ischemia-reperfusion.

Peter H Lapchak¹, Lakshmi Kannan, Antonis Ioannou

¹Rheumatology Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02115, USA.

American Journal of Physiology. Gastrointestinal and Liver Physiology

|February 4, 2012

Summary

This summary is machine-generated.

Platelets significantly contribute to remote lung damage following mesenteric ischemia-reperfusion (I/R) injury, and also play a role in local intestinal damage. Targeting platelets may mitigate I/R-induced organ damage.

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Visualization of Neutrophil Extracellular Traps in Mesenteric Venules After Mesenteric Ischemia-Reperfusion Injury via Intravital Microscopy

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Murine Model of Intestinal Ischemia-reperfusion Injury

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Microfluidics in Assessing Platelet Function

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Area of Science:

Gastroenterology
Pulmonology
Immunology

Background:

Ischemia-reperfusion (I/R) injury is a major cause of illness and death.
The role of platelets in mesenteric I/R injury is not well understood.

Purpose of the Study:

To investigate the role of platelets in local and remote organ damage following mesenteric I/R injury.
To determine if platelets contribute to lung injury after mesenteric I/R.

Main Methods:

A murine model of mesenteric I/R was utilized.
Platelet depletion and transfusion strategies were employed.
Tissue damage and complement deposition were assessed in the intestine and lungs.

Main Results:

Platelets were found to orchestrate remote lung damage and contribute to local intestinal villi damage after mesenteric I/R.
Lung damage was characterized by platelet accumulation in pulmonary vasculature and capillaries.
Reduced tissue damage and C3 deposition were observed in platelet-deficient mice, with increased damage upon platelet transfusion.

Conclusions:

Platelets are a key upstream mediator of remote lung injury following mesenteric I/R.
Platelets, alongside complement, are critical in the pathogenesis of I/R injury.
Therapeutic strategies for I/R injury should consider the involvement of platelets.