Related Experiment Video
Updated: Nov 10, 2025
06:47
Microfluidics in Assessing Platelet Function
Published on: November 8, 2024
1.2K
Aquaporins in platelet function.
Ejaife O Agbani1, Alastair W Poole2
1Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Alberta, Canada.
Platelets
|April 5, 2021
Summary
Aquaporins (AQPs) facilitate water transport in platelets, influencing blood clotting. Targeting AQPs offers a novel approach for developing anti-thrombotic therapies distinct from current treatments.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- Aquaporins (AQPs) are channel proteins regulating water and small solute transport across cell membranes.
- Thirteen AQP isoforms exist in mammals, with several potentially expressed in platelets.
- Platelet AQPs play a role in osmotic swelling, calcium influx, and membrane dynamics.
Purpose of the Study:
- To review the role of aquaporins in platelet function, including secretion, aggregation, and procoagulation.
- To discuss the challenges and prospects of targeting AQPs for antithrombotic therapies.
- To explore AQP-mediated mechanisms in arterial and venous thrombosis.
Main Methods:
- Review of existing literature on aquaporins and platelet biology.
- Analysis of studies investigating AQP function in platelet procoagulant activity.
- Examination of animal models of thrombosis related to AQP function.
Main Results:
- AQP1-mediated osmotic swelling is crucial for platelet phosphatidylserine exposure and microvesiculation.
- AQP1 deletion reduces platelet procoagulant activity and arterial thrombosis in vivo.
- Platelet AQPs are implicated in both arterial and venous thrombosis, independent of granule secretion.
Conclusions:
- Platelet AQPs are promising targets for novel anti-procoagulant antithrombotics.
- Targeting AQPs presents challenges due to their structure but is supported by compelling thrombosis data.
- Further research into AQP-targeted antithrombotics is warranted for both arterial and venous thrombosis.
Related Concept Videos
01:25Aquaporins
5.7K
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
5.7K
01:18Structure and Function of Platelets
2.4K
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 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...
2.4K
01:22Formation of the Platelet Plug
8.0K
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...
8.0K
01:20Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors
819
Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
819
01:30Anticoagulant Drugs: Low-Molecular-Weight Heparins
1.2K
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...
1.2K
01:16Clot Retraction and Fibrinolysis
7.7K
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.
7.7K