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We will use genetically engineered mice to study brain circuitry in an effort to understand the anatomical basis of Huntington's disease and a number of other more common degenerative brain diseases similar to Parkinson's disease. We will look at the brain in detail to decipher how the injured brain repais itself by making new connections and by producing new cells. We will also study supporting cells in the brain to determine if they play a beneficial role in this injury repair process.
Postsynaptic Signalling Systems That Sustain The Nerve-muscle Synapse
Funder
National Health and Medical Research Council
Funding Amount
$598,041.00
Summary
Neuromuscular junctions (NMJ) are the synapses through which motor nerves control our voluntary muscle cells. This project will investigate the molecular signalling system between nerve and muscle that helps maintain healthy NMJs. Normal ageing involves a progressive decline in muscle strength, often leading to loss of independence in the elderly. We will use a mouse model to test whether a breakdown of the NMJ signalling system contributes to the loss of strength in old age.
NEU-HORIZONS: The Neuroprotection And Therapeutic Use Of Riluzole For The Prevention Of Oxaliplatin Neurotoxicity Study.
Funder
National Health and Medical Research Council
Funding Amount
$382,402.00
Summary
Colorectal cancer is the second most commonly diagnosed cancer in Australia, with more than 13500 cases recorded annually. Oxaliplatin is an effective chemotherapy for the treatment of colorectal cancer. The major side-effect of oxaliplatin is the development of nerve damage that leads to loss of feeling in the hands and feet and significant disability. The aim of this study is to conduct a trial of a new treatment for oxaliplatin-induced nerve damage.
Protein Partners Of Rapsyn That Regulate Acetylcholine Receptor Clustering
Funder
National Health and Medical Research Council
Funding Amount
$411,000.00
Summary
Spinal nerves control our limb muscles by releasing chemical signals directly onto the surface of muscle fibres that they contact. These chemical signalling contacts are called synapses. They are like the synapses between nerve cells in our brains but easier to study, meaning that we can make more rapid progress in understanding how synapses work. The sensor receptors for chemical signals at the nerve-to-muscle synapse are held in place on the muscle fibre surface by a protein called rapsyn. In ....Spinal nerves control our limb muscles by releasing chemical signals directly onto the surface of muscle fibres that they contact. These chemical signalling contacts are called synapses. They are like the synapses between nerve cells in our brains but easier to study, meaning that we can make more rapid progress in understanding how synapses work. The sensor receptors for chemical signals at the nerve-to-muscle synapse are held in place on the muscle fibre surface by a protein called rapsyn. In turn, rapsyn must be organized by other chemical signals from the nerve, but we don't know exactly how this happens. When the receptors become disorganized at the synapse, in diseases such as Myasthenia Gravis, we lose control of our muscles. This project will employ newly developing techniques of proteomics and genomics to identify new proteins that bind to rapsyn and to test how they work to organize receptors at the synapse. By identifying the proteins that control rapsyn we may be able to develop new treatments for Myasthenia Gravis that restore the function of the synapse with less side effects than current therapies.Read moreRead less
Targeting Calcineurin For Improving Muscle Regeneration In Skeletal Muscle Disease
Funder
National Health and Medical Research Council
Funding Amount
$303,000.00
Summary
Muscular dystrophy is a term that covers a diverse group of inherited disorders characterised by progressive muscle weakness and wasting. Duchenne muscular dystrophy (DMD) is the most severe form, caused by a lack of a protein called dystrophin, which renders muscles fragile, susceptible to damage, and with a compromised ability to regenerate or repair after injury. The disease progresses to all muscles and DMD patients are dependent on a wheelchair before their early teens and die in their twen ....Muscular dystrophy is a term that covers a diverse group of inherited disorders characterised by progressive muscle weakness and wasting. Duchenne muscular dystrophy (DMD) is the most severe form, caused by a lack of a protein called dystrophin, which renders muscles fragile, susceptible to damage, and with a compromised ability to regenerate or repair after injury. The disease progresses to all muscles and DMD patients are dependent on a wheelchair before their early teens and die in their twenties. There is a profound need for treatments that can ameliorate the dystrophic condition and improve patient quality of life. Restoring or increasing a muscle's capacity to regenerate would help improve muscle function. We have convincing evidence that the calcineurin signal transduction pathway is important for successful muscle regeneration in mice with muscular dystrophy. There is growing excitement worldwide that stimulating calcineurin could attenuate the dystrophic pathology, however, little is known about the role of calcineurin signalling in human muscle disease. Our goals are to investigate the role of calcineurin signalling in muscular dystrophy and to examine its therapeutic potential for enhancing muscle regeneration. Our aim is to better understand the mechanisms controlling calcineurin signalling in muscles of dystrophic mice and in muscles of patients with DMD. A comprehensive series of physiological, molecular, biochemical, and immunohistochemical experiments will be performed to rigorously test our research aim. Understanding the role of the calcineurin pathway in muscle regeneration is important for the development of novel therapeutic strategies to delay the onset or slow the progression of muscle wasting and weakness. The findings will have broad clinical application for our understanding of muscular dystrophy with relevance to other conditions including ageing, AIDS, burns, cancer cachexia, and disuse atrophy, where muscle wasting occurs.Read moreRead less
Role Of Synaptogenesis In Developmental Motoneuron Cell Death
Funder
National Health and Medical Research Council
Funding Amount
$361,650.00
Summary
Naturally occurring cell death is an important and necessary event that shapes the developing embryo. It occurs in all organs of the developing body. In the nervous system about 50% of all neurons die at a time when they are making contact with one another or with their target organs. The underlying mechanisms that drive programmed neuronal cell death are not known. One possibility is that the formation of neuronal contacts (synapses) with other neurons and target cells determines the fate of a ....Naturally occurring cell death is an important and necessary event that shapes the developing embryo. It occurs in all organs of the developing body. In the nervous system about 50% of all neurons die at a time when they are making contact with one another or with their target organs. The underlying mechanisms that drive programmed neuronal cell death are not known. One possibility is that the formation of neuronal contacts (synapses) with other neurons and target cells determines the fate of a neuron. The connections of motor neurons with muscle during this period of developmental neuronal cell death is the best model to examine this phenomenon. In this grant we are in an exciting position to be able to address what causes neuronal cell death, as we have a number of mice that lack key molecules needed for the formation of specializations that allow neuronal contacts to be made between motor neurons and their muscle, and with other neurons within the spinal cord. By examining the function of motor neurons, counting them and screening for molecular changes in these mice, we will be able to dissect out the mechanism of how a motor neurons' fate is determined during the period of programmed cell death. The outcomes of this research will enable us to understand how the nervous system is shaped during development and will increase our knowledge about the basis of adult neurodegenerative diseases. For example, the pathology of Alzheimer's is characterised by a breakdown in neuronal connections that ultimately result in neuronal death and a loss of thought processes (cognition).Read moreRead less
All cells have a characteristic shape (morphology), which is intrinsic to cellular function. A blood cell is designed to move in a liquid medium whereas a muscle cell is optimised for physical movement of attached bones. We are studying the mechanisms which control cell shape. We focus on the components of the cell skeleton (cytoskeleton) which are implicated in the regulation of shape. In particular, we study the actin based microfilament system. We have previously shown that two types of these ....All cells have a characteristic shape (morphology), which is intrinsic to cellular function. A blood cell is designed to move in a liquid medium whereas a muscle cell is optimised for physical movement of attached bones. We are studying the mechanisms which control cell shape. We focus on the components of the cell skeleton (cytoskeleton) which are implicated in the regulation of shape. In particular, we study the actin based microfilament system. We have previously shown that two types of these components of the cytoskeleton are able to control the structure of cells. In addition, we have found that variants of these two components (called isoforms) are used to build structures in different parts of cells. This has led us to think about the anatomy of cells and tissues in a new way. In some ways its like building a city. You create different kinds of buildings to suit their purpose. Each building uses a combination of building blocks which suit the structural demands of rooms and the overall building. In this study we are proposing to identify the specific job that one of these types of building blocks must play in order to allow normal cell growth and embryo development. To do this, we plan to change these genes in mice and then examine the impact on cell and tissue anatomy. This promises to contribute to the conversion of anatomical science and pathology from descriptive to experimental-mechanistic disciplines. This in turn will lead to a new tool set of diagnostic agents for the pathologist and the development of drugs which target specific functions of the cytoskeleton.Read moreRead less
Flecainide In Amyotrophic Lateral Sclerosis - A Neuroprotective Strategy
Funder
National Health and Medical Research Council
Funding Amount
$593,275.00
Summary
This project will provide clinical trial information related to the potential neuroprotective properties of flecainide in motor neurone disease patients. A potential therapeutic response would provide impetus for a larger scale, multi-centre clinical trial. In addition to providing information about potential mechanisms of neurodegeneration and their treatment, new quantifiable measures will be further developed to objectively monitor MND patients in a clinical trials setting.
Gene Therapy To Cure Botulinum Toxin Intoxication And New Motoneuron Delivery System
Funder
National Health and Medical Research Council
Funding Amount
$390,321.00
Summary
The aim of the project is to establish two biotechnological strategies to help curing motoneuronal diseases. Botulinum neurotoxins (BoNTs) are the deadliest toxins known. They provoke profound flaccid neuromuscular paralysis that leads to death due to respiratory failure. There are no current therapies available and affected patients require respiratory assistance for up to 7 months with sophisticated respirators. BoNT is therefore an acquired motoneuronal disease and a well-known biological wea ....The aim of the project is to establish two biotechnological strategies to help curing motoneuronal diseases. Botulinum neurotoxins (BoNTs) are the deadliest toxins known. They provoke profound flaccid neuromuscular paralysis that leads to death due to respiratory failure. There are no current therapies available and affected patients require respiratory assistance for up to 7 months with sophisticated respirators. BoNT is therefore an acquired motoneuronal disease and a well-known biological weapon which is also easy to produce in large quantities. It is therefore important to provide a quick and efficient way of overriding BoNT-induced paralysis other than very costly mechanical respirators. Our first strategy aims at designing a gene therapy against botulism. BoNTs promote muscular paralysis by cleaving molecules implicated in the mechanism of neuronal communication (SNARE proteins). Our aim is to deliver genetically modified uncleavable forms of SNAREs to rescue neuronal communication and prevent botulism. BoNT are comprised of two chains: a toxic light chain and a non toxic heavy chain which is responsible for the extreme selectivity of BoNT for motoneurons and for delivering the light chain in the motoneuronal cytosol by a mechanism named translocation. Our second aim is to use the BoNTs atoxic heavy chain to engineer a selective motoneuronal delivery system. This could be useful in the future to deliver molecules of interest in diseased motoneurons.Read moreRead less