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Too few blood platelets leads to fatal haemorrhage, and patients with low platelet counts require transfusions to prevent bleeding. We have recently discovered the key to keeping platelets alive, and now propose the critical experiments which will teach us how to manipulate it and allow platelets to live longer. Our team leads the world in this field. If successful we expect to improve blood bank platelet storage, and boost the supply of platelets available to patients in need of transfusion.
Bcl-2 Proteins And The Regulation Of The Megakaryocyte Lineage.
Funder
National Health and Medical Research Council
Funding Amount
$416,240.00
Summary
Platelets are tiny cells that circulate in the blood. They are essential for blood clotting. Too few platelets leads to uncontrolled bleeding. Platelets are produced in the bone marrow by cells called 'megakaryocytes'. Cancer chemotherapy often causes dangerous decreases in platelet count - this is thought to be because it kills megakaryocytes. We will pinpoint the molecules responsible for megakaryocyte life and death. This has the potential to make the side effects of chemotherapy less severe.
Factor XII-dependent Thrombosis And Platelet Glycoprotein Ib
Funder
National Health and Medical Research Council
Funding Amount
$336,767.00
Summary
We will determine the value of targeting the interaction between a receptor unique to platelets, glycoprotein Ib, and two factors (XI and XII) in plasma involved in blood clotting, as a novel strategy to prevent clots that lead to heart attack-stroke. Our study is at the basic research-clinical interface and has the potential to improve our understanding of both bleeding in patients with Factor XI-XII defects and prevention of dangerous levels of clotting without affecting normal vessel repair.
Platelet Receptor Regulation In Autoimmune Disease
Funder
National Health and Medical Research Council
Funding Amount
$507,536.00
Summary
In response to bleeding, blood platelets use receptors to form a thrombus (blood clot) and block further loss of blood and aid tissue repair. People treated with heparin prior to surgery, can form autoantibodies that attack platelets, leading to thombus and thrombocytopenia (dangerous loss of circulating platelets). This is a significant clinical problem that is difficult to diagnose. We will determine how platelet receptor shedding can aid the diagnosis of heparin-induced thrombocytopenia.
Ligand Interactions Of Platelet Glycoprotein Ib-IX-V In Thrombosis
Funder
National Health and Medical Research Council
Funding Amount
$363,098.00
Summary
The transition of circulating blood platelets from a fluid-phase, non-adherent state to an adherent, activated and aggregated state (thrombus formation) is critical in the normal haemostatic response to blood vessel injury and in thrombotic diseases such as heart attack and stroke. One unique platelet receptor, the glycoprotein Ib-IX-V complex, is of particular interest, because it initiates platelet aggregate or thrombus formation at high fluid shear stress in flowing blood, including the patho ....The transition of circulating blood platelets from a fluid-phase, non-adherent state to an adherent, activated and aggregated state (thrombus formation) is critical in the normal haemostatic response to blood vessel injury and in thrombotic diseases such as heart attack and stroke. One unique platelet receptor, the glycoprotein Ib-IX-V complex, is of particular interest, because it initiates platelet aggregate or thrombus formation at high fluid shear stress in flowing blood, including the pathological shear stress that occurs in a sclerotic coronary artery. Our published and preliminary results show how GPIb-dependent interaction of platelets with von Willebrand factor, the major adhesive ligand for GPIb-IX-V, is dependent on the level of shear stress. Using a cross-species (human to canine) homology-swap approach, where human sequence is replaced by the corresponding canine sequence within discrete structural domains, a sequence of GPIb has been identified which becomes increasingly important as hydrodynamic shear stress increases. It is proposed to further define the interactive surface of GPIb that recognizes von Willebrand factor at increasing shear, and to define the relationship between the shear-dependent alteration of GPIb conformation and its ability to interact with other pro-thrombotic or pro-inflammatory binding partners.Read moreRead less