Related Experiment Video
Updated: Jul 16, 2026
08:04
Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
Published on: June 10, 2025
Relationship between changes in platelet reactivity and changes in platelet receptor expression induced by physical
Cristina Aurigemma1, Andrea Fattorossi, Alfonso Sestito
1Institute of Cardiology, Università Cattolica del Sacro Cuore, Rome, Italy.
Thrombosis Research
|March 6, 2007
Summary
Exercise increases platelet reactivity in coronary artery disease (CAD) patients, specifically linked to higher glycoprotein (GP) IIb/IIIa receptor expression. This finding clarifies the relationship between exercise, platelet function, and receptor changes in CAD.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Exercise Physiology
Background:
- Previous studies show increased platelet reactivity post-exercise in coronary artery disease (CAD) patients.
- Significant individual variability exists in exercise-induced platelet response among CAD patients.
- The correlation between exercise-induced platelet reactivity and changes in platelet membrane receptors in CAD remains unclear.
Purpose of the Study:
- To investigate the relationship between exercise-induced changes in platelet reactivity and platelet membrane receptor expression in patients with stable CAD.
- To determine if specific platelet receptors are associated with altered platelet function after exercise in CAD.
Main Methods:
- 26 stable CAD patients and 10 healthy controls underwent treadmill exercise.
- Platelet reactivity measured by PFA-100 (closure time, CT) using collagen/adenosine diphosphate (C/ADP) stimulation at rest and post-exercise.
- Platelet glycoprotein (GP) IIb/IIIa (CD41, PAC-1) expression and P-selectin (CD62P) assessed via flow cytometry.
Main Results:
- CAD patients showed decreased CT post-exercise (increased reactivity), unlike controls.
- Platelet CD41 and PAC-1 expression significantly increased in CAD patients after exercise.
- CAD patients with greater CT decrease (higher reactivity) exhibited increased CD41 and PAC-1 expression compared to those with no reactivity increase.
Conclusions:
- Exercise-induced increases in platelet reactivity in stable CAD patients are specifically associated with elevated platelet GP IIb/IIIa receptor expression.
- The PFA-100 method can identify exercise-induced changes in platelet reactivity linked to GP IIb/IIIa upregulation in CAD.
Related Concept Videos
01:20Exercise and Cardiovascular Response
Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
01:22Formation 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...
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...
01:18Structure 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...
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...
01:30Peripheral Artery Disease I: Introduction
Peripheral artery disease (PAD) predominantly results from atherosclerosis, which involves the accumulation of fatty deposits, or plaques, within the walls of arteries. This causes them to narrow and harden, significantly reducing blood flow. PAD predominantly affects the legs, particularly the arteries supplying the thighs and calves. In rare cases, it may involve other arteries, including those in the arms.Etiology of PAD:The principal cause of PAD is atherosclerosis, which results from fatty...
01:27Exercise and Muscle Performance
Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...