KILLING OF MYCOBACTERIUM TUBERCULOSIS IN MACROPHAGES VIA THE P2X7 RECEPTOR
Funder
National Health and Medical Research Council
Funding Amount
$226,320.00
Summary
Tuberculosis remains an enormous global health problem. Some 32% of the world population are infected, with over 1 million persons dying each year. The risk of an infected individual developing clinical disease ranges from 2-23% for their lifetime. We know that both environmental factors, such as declining socio-economic conditions, and genetic risk factors such as HLA type contribute to the likelihood of an individual developing disease, but current known factors are insufficient to fully accou ....Tuberculosis remains an enormous global health problem. Some 32% of the world population are infected, with over 1 million persons dying each year. The risk of an infected individual developing clinical disease ranges from 2-23% for their lifetime. We know that both environmental factors, such as declining socio-economic conditions, and genetic risk factors such as HLA type contribute to the likelihood of an individual developing disease, but current known factors are insufficient to fully account for the risk attributed to genetics. The aim of this project is to investigate another potential risk factor involved in the development of tuberculosis, that of P2X7 receptor function. A natural compound, ATP, when added to macrophages is able to kill tuberculosis organisms residing within the macrophage. This process occurs when ATP activates the P2X7 receptor. We have recently identified a mutation in the P2X7 receptor, which causes a loss of receptor function. Individuals who have this mutation are unable to respond to ATP and hence may be unable to kill tuberculosis. Our studies will determine if the mutation we have identified in the P2X7 receptor prevents or inhibits ATP mediated killing of mycobacteria. Furthermore we will determine the frequency of this mutation in TB patients and the general population to determine if this mutation in the P2X7 receptor is a risk factor for the development of tuberculosis disease.Read moreRead less
Activated Protein C As A Promoter Of Wound Healing
Funder
National Health and Medical Research Council
Funding Amount
$391,650.00
Summary
The healing of wounds is a complex process involving a number of stages, including coagulation, inflammation, remodelling and finally development of full strength skin. Impaired wound healing and-or skin ulcers occur in patients with peripheral arterial occlusive disease, deep vein thrombosis, diabetes, pressure sores and burns. Despite intense investigation, the precise mechanisms associated with impaired healing are poorly understood. APC is a serine protease that plays a central role in physi ....The healing of wounds is a complex process involving a number of stages, including coagulation, inflammation, remodelling and finally development of full strength skin. Impaired wound healing and-or skin ulcers occur in patients with peripheral arterial occlusive disease, deep vein thrombosis, diabetes, pressure sores and burns. Despite intense investigation, the precise mechanisms associated with impaired healing are poorly understood. APC is a serine protease that plays a central role in physiological anticoagulation. APC potently activates gelatinase A, an enzyme that plays a prominent role during the remodelling phase of wound healing and angiogenesis. Our preliminary experiments provide very strong evidence that APC accelerates wound healing using both cultured cells and a rat skin wounding model. There are three aims to this study. The first will use cell culture techniques to investigate the mechanisms of action of APC during wound healing. Secondly, we will expand our pilot studies on the effect of APC as a promoter of wound healing in vivo. These studies will examine the exact dosing and timing regime for APC, using a rat wound healing model. In addition, we will test the effect of APC on slow healing wounds, present in diabetic rats. Thirdly, we will determine whether APC is quantitatively or functionally deficient in human wound fluid derived from slow-healing wounds compared to wounds that heal normally. This is the first time that APC has been implicated in wound healing. It is envisaged that this work will ultimately lead to a novel topical treatment of APC to accelerate slow-healing wounds.Read moreRead less
Novel Single-chain Antibody-targeted Nanoparticles For Diagnosis Of Vascular Diseases In Magnetic Resonance Imaging
Funder
National Health and Medical Research Council
Funding Amount
$460,797.00
Summary
The aim of this project is to develop targeted imaging agents that seek out specific markers for various states of cardiovascular disease. These agents would provide a method for detecting the presence and level of atherosclerosis and thrombotic events. The targeted nanoparticles may provide a unique opportunity to detect very early plaques, the vulnerability of existing plaques and difficult to diagnose vessel blockages such as pulmonary embolism.
We have discovered that activating a cell surface protein increases blood sugar levels in mice. This might occur in diabetes and liver disease. We plan to (1) learn which activators of this protein increase glucose; (2) understand how they affect glucose metabolism; (3) study new inhibitors of this protein for blocking increased glucose production; (4) test the potential therapeutic benefits of blocking this protein in mouse models of type 2 diabetes and non-alcoholic fatty liver disease.
Defining The Function Of The Thrombin Receptor, PAR4, On Human Platelets
Funder
National Health and Medical Research Council
Funding Amount
$541,402.00
Summary
Inappropriate blood clot formation is the cause of most heart attacks and strokes, and platelets are the cells in the blood which form these clots. Drugs that block platelet function, such as aspirin, are used to prevent heart attack and stroke but are frequently ineffective. We will study the signals which control platelet incorporation into clots in order to discover improved therapeutic strategies for heart attack and stroke prevention.
Proof-of-concept Studies For A Novel Anti-thrombotic Agent
Funder
National Health and Medical Research Council
Funding Amount
$632,352.00
Summary
Blood clots cause most heart attacks and strokes, and platelets are the blood cells that form these clots. Drugs that block platelet function, such as aspirin, are used to prevent heart attack and stroke but are frequently ineffective. Here, we will develop a new drug that prevents platelet incorporation into blood clots, that will be suitable for the prevention of heart attack and stroke in humans, and that may improve on existing therapies.