Novel Radiolabelled Peripheral Benzodiazepine Receptor (PBR) Ligands For Imaging And Treating Neuroinflammation
Funder
National Health and Medical Research Council
Funding Amount
$425,460.00
Summary
Neuroinflammation is involved in chronic, slowly progressive neurodegenerative diseases such as Multiple Sclerosis, and Alzheimer's, Parkinson's and Huntington's Diseases. A signifiacnt and early charactersitic in the development of neuroinflammation and the progression of these diseases is the damaging changes that occur to specific cells called glial cells in the brain. Termed microglial activation these changes cause regions of the brain to succumb to progressive disease and tissue destructio ....Neuroinflammation is involved in chronic, slowly progressive neurodegenerative diseases such as Multiple Sclerosis, and Alzheimer's, Parkinson's and Huntington's Diseases. A signifiacnt and early charactersitic in the development of neuroinflammation and the progression of these diseases is the damaging changes that occur to specific cells called glial cells in the brain. Termed microglial activation these changes cause regions of the brain to succumb to progressive disease and tissue destruction. The ability to pickup early signs of injury or to measure destructive changes to glial cells in the brain using noninvasive imaging techniques would be of great value in the clinical diagnosis and management of neurodegenerative disease. The ubiquitous nature of these activated microglia also makes the microglia a target for the development of pharmacological approaches to the treatment or prevention of many central nervous system diseases. Researchers at ANSTO and the ANU have developed a novel class of molecules, which target a specific protein called the peripheral benzodiazepine receptor or PBR which is enhanced in damaged glia. Radiolabelled analogues of these molecules have demonstrated a strong correlation between inflammation and the expression of this receptor in various animal models of inflammation and neurodegeneration. Furthermore, these molecules have the potential to inhibit further damage to these glial cells and could potentially slow down the progression of the disease. Therefore, further development of these molecules both as radiopharmaceuticals for noninvasive medical imaging and-or as inhibitors of microglial activation could have a significant impact on the understanding, management and treatment of neurodegenerative disease.Read moreRead less
Peripheral Neuropathy And Pain: Role Of The Sphingosine Kinase-sphingosine 1-phosphate System
Funder
National Health and Medical Research Council
Funding Amount
$282,905.00
Summary
Understanding the neural mechanisms that generate pathological pain remains one of the essential goals for the development of effective treatments for pain, chronic pain with less side effects. Lipids are able to modulate pain perception. We will determine the role of a molecule named sphingosine 1-phosphate as a basis for the development of therapies for the treatment of neuropathic pain.
The Incidence And Predictors Of Foot Disease Hospitalisation
Funder
National Health and Medical Research Council
Funding Amount
$318,768.00
Summary
Foot disease seems to be a much larger cause of hospitalisation than first thought. This research program aims to study for the first ever time the annual incidence of foot disease hospitalisation and develop models to predict which patients with foot disease are likely to be hospitalised or die. We believe this research will help clinicians, researchers and governments from around the world to measure, predict and prevent foot disease hospitalisation in their nations for the first time.
Defining The Role Of EphA5 In Olfactory Axon Growth, Guidance And Fasciculation
Funder
National Health and Medical Research Council
Funding Amount
$256,320.00
Summary
The olfactory (smell) system is a unique part of the nervous system; nerve cells are generated throughout life and it can regenerate even after injury. It therefore provides an excellent model for examining the growth, development and maintenance of nerve cells. This project will examine the effects on the organisation of the olfactory system when some guidance signals are altered. Information we obtain about how this system develops and regenerates may be useful in treating brain disorders and ....The olfactory (smell) system is a unique part of the nervous system; nerve cells are generated throughout life and it can regenerate even after injury. It therefore provides an excellent model for examining the growth, development and maintenance of nerve cells. This project will examine the effects on the organisation of the olfactory system when some guidance signals are altered. Information we obtain about how this system develops and regenerates may be useful in treating brain disorders and spinal injuries In the current project we will examine the effects of specific nerve cell guidance molecules by generating transgenic mice that produce these molecules only in the olfactory system. We can then determine what changes occur to the nerve cells when these extra molecules are produced. In addition, we will also examine the behaviour of live cells as they are growing. In the past all attempts to understand how nerve cell connections are formed in the olfactory system have used dead tissue that has been permanently preserved. In this project we have the unique opportunity to visualise living nerve cells to enable us to determine how the cells react to the guidance signals. The advantage of this approach is that it allows us to identify important interactions as they occur, rather than attempting to decipher them after they have occurred. An analogy would be watching a football game live and observing how goals were scored and appreciating the performance of individual players versus trying to guess from the final score how the game was played and who the key performers were. The results of these experiments will provide important information on the regeneration of olfactory nerve cells, as well as on the initial growth and targeting of these nerve cells.Read moreRead less
Novel Aspects Of Angiotensin AT1 Receptor Signalling Pathways
Funder
National Health and Medical Research Council
Funding Amount
$219,750.00
Summary
Hormones are chemicals released into the blood to influence tissue function by binding to specific sites (receptors) located on the cells found in a particular tissue. In general, it has been considered that a specific receptor activates a specific response when bound by the hormone. However, it is now clear that closely related hormones can activate different patterns of response even when they bind the one type of receptor. The full consequence of this phenomenon is still unknown. Its signific ....Hormones are chemicals released into the blood to influence tissue function by binding to specific sites (receptors) located on the cells found in a particular tissue. In general, it has been considered that a specific receptor activates a specific response when bound by the hormone. However, it is now clear that closely related hormones can activate different patterns of response even when they bind the one type of receptor. The full consequence of this phenomenon is still unknown. Its significance will be investigated in this project for important hormones which are involved in blood pressure control. The renin-angiotensin system makes the hormone angiotensin II which increases blood pressure through actions the heart, blood vessels, nerves and kidneys. One particular receptor type, the AT1 receptor, is responsible for the majority of effects of angiotensin II on these tissues and drugs that inhibit the activity of this receptor are very useful therapies for diseases such as hypertension and heart failure. However, Angiotensin III is a second hormone of the renin-angiotensin system that may also have important effects on tissue function when it activates the AT1 receptor. We have evidence that the type of tissue response that results from angiotensin III activated AT1 receptors is different from the response that results from angiotensin II activation of the same receptors. This raises the possibility that the effects of the AT1 receptor in cardiovascular disease might be differentially promoted by the two angiotensins. This project will investigate the mechanisms by which angiotensin II and anagiotensin III can elicit different activation via the AT1 receptor, and will determine the consequences of this differntial activation to tissue function.Read moreRead less
Selectivity And Mode Of Action Of Rho-conopeptide TIA: A Novel Inhibitor Of Alpha1-adrenoceptors.
Funder
National Health and Medical Research Council
Funding Amount
$399,300.00
Summary
A major obstacle to the development of safer and more effective treatments for cardivascular diseases and benign prostatic hyperplasia is the inability to find small molecules with sufficient specificity to be safe and effective. The applicant team brings together a unique set of complementary research interests and skills in using conotoxins to define, at the molecular level, how rho-conotoxins act at the alpha1-adrenoceptor, a major drug target for cardiovascualr and related diseases. Rho-cono ....A major obstacle to the development of safer and more effective treatments for cardivascular diseases and benign prostatic hyperplasia is the inability to find small molecules with sufficient specificity to be safe and effective. The applicant team brings together a unique set of complementary research interests and skills in using conotoxins to define, at the molecular level, how rho-conotoxins act at the alpha1-adrenoceptor, a major drug target for cardiovascualr and related diseases. Rho-conotoxins are novel peptide inhibitors of the alpha1-adrenoceptor that appear to act at an undescribed allosteric site. This Project will use rho-conotoxins and analogues to characterise structurally and functionally how and where this class of conopepides act. The structure activity relationship for rho-conotoxins will be established to guide the development of subtype specific inhibitors. Pairwise interactins between the alpha1-adrenoceptorand TIA will be used to dock TIA onto a homolgy model of the alpha1-adrenoceptor. The long-term goal of the project is to develop new and safer treatments for cardiovascular and related disorders.Read moreRead less
Novel G-protein Coupled Receptors LGR7 And LGR8; The Receptors For Relaxin And Insulin-like Peptide 3 (INSL3)
Funder
National Health and Medical Research Council
Funding Amount
$496,500.00
Summary
Relaxin is a hormone which has long been known to have essential roles in pregnancy and birth. However it has also been demonstrated to have far broader involvement in the functioning of the kidney, heart and central nervous system. Furthermore, mice lacking relaxin show increased collagen, or fibrosis, in their internal organs and skin as they age. This progressive fibrosis leads to problems with bodily functions. Treatment of these mice with relaxin reverses the fibrosis and restores function, ....Relaxin is a hormone which has long been known to have essential roles in pregnancy and birth. However it has also been demonstrated to have far broader involvement in the functioning of the kidney, heart and central nervous system. Furthermore, mice lacking relaxin show increased collagen, or fibrosis, in their internal organs and skin as they age. This progressive fibrosis leads to problems with bodily functions. Treatment of these mice with relaxin reverses the fibrosis and restores function, hence relaxin has great potential as a treatment for fibrotic diseases. Anti-fibrotic drugs are a major target for drug companies as suitable compounds are not currently available. Research into the mechanisms whereby relaxin exerts its cellular effects has been limited by the inability of researchers to identify its receptor. We now know that relaxin acts through a novel G-protein coupled receptor (GPCR) LGR7 and will also act on a related receptor LGR8. The LGR8 receptor is actually the receptor for a hormone with similarities to relaxin, INSL3. It is essential that an appreciation of relaxin receptor function is obtained not only for its important actions in pregnancy, but also for its clinical applications. In this regard, improved understanding of how relaxin interacts with these two receptors is essential. We will use our expertise in producing these hormones together with molecular techniques to produce the receptor, to study the interaction of relaxin and INSL3 with these receptors and the subsequent cellular events that occur. Furthermore, to more effectively use relaxin as a drug, we need to discover a smaller, more potent and orally active form of the hormone. We will develop novel technologies to aid in the discovery of the next generation of relaxin drugs. This multi-disciplinary approach will allow us to fully maximise the clinical potential of this enigmatic hormone.Read moreRead less
Developing Improved Management For Peripheral Artery Diseases
Funder
National Health and Medical Research Council
Funding Amount
$569,219.00
Summary
~1 million Australians have peripheral artery disease. The current application is for a Practitioner Fellowship to support my research aimed at improving care of artery disease. The aim of the work is to develop improved management approaches for patients with blocked and weakened arteries. This work is particularly important given the recognised management deficiencies for patients with artery disease and the relative little research being undertaken in this area.
How Amyloid Causes Neurodegeneration: The Role Of Transthyretin In Familial Amyloidotic Polyneuropathy
Funder
National Health and Medical Research Council
Funding Amount
$618,950.00
Summary
This project seeks to understand the biochemical basis of nerve degeneration in a disease known as familial amyloidotic polyneuropathy. This disease is caused by a protein known as transthyretin, which is abnormally deposited around nerves and causes nerve damage. The project is highly likely to provide clues which help us understand some related dementia causing diseases like Alzheimer's disease and prion diseases such as scrapie and mad cow disease.