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Anticoagulant Drugs: Low-Molecular-Weight Heparins

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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...

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...

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...

Extrinsic and Intrinsic Pathways of Hemostasis

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...

Disorders of Hemostasis

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.

Venous Thrombosis I: Introduction

Venous Thrombosis I: Introduction

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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Related Experiment Video

Updated: May 7, 2026

Ferric Chloride-induced Murine Thrombosis Models

Ferric Chloride-induced Murine Thrombosis Models

Published on: September 5, 2016

A molecular defect in thrombasthenic platelets.

L Degos, A Dautigny, J C Brouet

The Journal of Clinical Investigation

|July 1, 1975

Summary

This summary is machine-generated.

A patient

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Last Updated: May 7, 2026

Ferric Chloride-induced Murine Thrombosis Models

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Published on: September 5, 2016

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

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Published on: May 23, 2025

Area of Science:

Immunology
Hematology
Biochemistry

Background:

Thrombasthenia is a rare bleeding disorder characterized by impaired platelet aggregation.
The specific molecular defects underlying thrombasthenia are not fully understood.
Identifying the affected molecules is crucial for understanding platelet function and developing diagnostics.

Purpose of the Study:

To characterize an autoantibody found in a patient with thrombasthenia.
To identify the platelet antigen recognized by this antibody.
To investigate the role of this antigen in platelet aggregation and thrombasthenia.

Main Methods:

Complement fixation tests using patient serum and normal/thrombasthenic platelets.
Inhibition assays of adenosine diphosphate (ADP)-induced platelet aggregation.
Indirect immunoprecipitation and gel electrophoresis (SDS-PAGE) to determine molecular weight.
Sephadex G-200 filtration for antigen analysis.

Main Results:

The patient's IgG antibody reacted with normal platelets but not thrombasthenic platelets.
The antibody inhibited ADP-induced platelet aggregation.
Family studies revealed intermediate antigen levels in heterozygotes.
The target antigen has an estimated molecular weight of 120,000 Da.

Conclusions:

The identified antibody recognizes a specific platelet molecule.
This molecule is likely absent or altered in thrombasthenia, impacting platelet function.
The findings suggest this molecule plays a role in platelet aggregation.