Physiological significance of transient receptor potential (TRPC3) ion channels in the cochlea. The project seeks to discover the function of transient receptor potential (TRPC3) ion channels in the cochlea. Recent studies have suggested that these proteins, which are expressed by the sensory and neural cells, are key elements regulating sound transduction and neurotransmission. The new knowledge about the physiological processes underlying hearing that this work will provide, will significantl ....Physiological significance of transient receptor potential (TRPC3) ion channels in the cochlea. The project seeks to discover the function of transient receptor potential (TRPC3) ion channels in the cochlea. Recent studies have suggested that these proteins, which are expressed by the sensory and neural cells, are key elements regulating sound transduction and neurotransmission. The new knowledge about the physiological processes underlying hearing that this work will provide, will significantly benefit national and international translational research that seeks to develop systems for controlling the sensitivity of our senses, developing biosensors, interacting with neural networks and developing neural prostheses. International collaborators in this project have enabled development of new models, technology and research training opportunities.Read moreRead less
Afferent stimulation-induced plasticity and its functional significance. Certain regions of the brain can reorganise (plasticity) during motor learning or when there is damage to peripheral nerves or muscles. There is a large body of evidence for these plastic changes in animals. Until recently data showing that similar changes occurred in humans was limited. However, we have recently demonstrated that certain patterns of peripheral stimulation can indeed induce similar changes in human subjects ....Afferent stimulation-induced plasticity and its functional significance. Certain regions of the brain can reorganise (plasticity) during motor learning or when there is damage to peripheral nerves or muscles. There is a large body of evidence for these plastic changes in animals. Until recently data showing that similar changes occurred in humans was limited. However, we have recently demonstrated that certain patterns of peripheral stimulation can indeed induce similar changes in human subjects. These findings are important for our understanding of the mechanisms of motor control and learning.Read moreRead less
Understanding the neuronal mechanisms underlying inherited epilepsies. Epilepsy is a serious disease that impacts severely on individuals and the community as a whole. Conservative estimates suggest a financial cost of more than $2 billion per annum. Drug treatment for this disease is often not adequate. Recent advances have allowed scientists to determine mutation in human genes that cause epilepsy. New models of epilepsy based on this knowledge will allow us to better understand what causes e ....Understanding the neuronal mechanisms underlying inherited epilepsies. Epilepsy is a serious disease that impacts severely on individuals and the community as a whole. Conservative estimates suggest a financial cost of more than $2 billion per annum. Drug treatment for this disease is often not adequate. Recent advances have allowed scientists to determine mutation in human genes that cause epilepsy. New models of epilepsy based on this knowledge will allow us to better understand what causes epilepsy enabling us to devise new and potent therapeutic strategies to treat the disease.Read moreRead less
Understanding the mechanisms of GABA type-A receptor activation and drug modulation. There is currently little understanding of how sedative and anxiolytic drugs, including valium, interact with their receptors in the brain. This project will dramatically increase our understanding of how these receptors work and how drugs affect their activity. This will provide new insights into drug discovery and design.
Suction pipette measurements of mammalian rod photoreceptor recovery following intense bleaching exposures. The aim of this project is to discover the events and processes that prevent retinal photoreceptors from recovering instantaneously following the cessation of exposure to extremely bright illumination. Recordings will be made from single rod photoreceptors cells isolated from the mammalian retina. The work will uncover the relative roles of the 'photoproducts' created when rhodopsin abso ....Suction pipette measurements of mammalian rod photoreceptor recovery following intense bleaching exposures. The aim of this project is to discover the events and processes that prevent retinal photoreceptors from recovering instantaneously following the cessation of exposure to extremely bright illumination. Recordings will be made from single rod photoreceptors cells isolated from the mammalian retina. The work will uncover the relative roles of the 'photoproducts' created when rhodopsin absorbs light: e.g. intermediates such as metarhodopsin and opsin. The molecular knowledge obtained will help us to understand why it is that the visual system recovers so slowly after the eye has experienced very intense light.Read moreRead less
The first stage of vision: transduction and adaptation in retinal photoreceptors. The project aims to provide a detailed understanding of the molecular steps involved in the first stage of vision - the conversion of light into a neural signal in the rod and cone photoreceptors of the retina. The significance of this is that it will explain the initial events that enable us to see, and will help explain the deficits that occur when the process fails. The outcome will be a comprehensive understand ....The first stage of vision: transduction and adaptation in retinal photoreceptors. The project aims to provide a detailed understanding of the molecular steps involved in the first stage of vision - the conversion of light into a neural signal in the rod and cone photoreceptors of the retina. The significance of this is that it will explain the initial events that enable us to see, and will help explain the deficits that occur when the process fails. The outcome will be a comprehensive understanding of how our photoreceptors respond with extreme sensitivity, yet great rapidity, and over an enormous range of light intensities, thus endowing us with our remarkable sense of vision.Read moreRead less
Use of an animal model to understand mechanisms underlying reductions in body weight associated with use of the laparoscopic adjustable gastric band. At least one in ten Australians is classified as morbidly obese and as such are eligible for bariatric surgery. Those undergoing the surgery will achieve an average excess weight loss of up to 60 per cent, they will have reduced or eliminated diabetes and will appreciably improve their prospects of survival. These experiments aimed at understandin ....Use of an animal model to understand mechanisms underlying reductions in body weight associated with use of the laparoscopic adjustable gastric band. At least one in ten Australians is classified as morbidly obese and as such are eligible for bariatric surgery. Those undergoing the surgery will achieve an average excess weight loss of up to 60 per cent, they will have reduced or eliminated diabetes and will appreciably improve their prospects of survival. These experiments aimed at understanding the mechanisms underpinning this success have the potential to further improve surgical approaches and outcomes and provide insights that will better enable weight loss therapies for all overweight and obese Australians.Read moreRead less
Specialized glial cells within the hippocampus of the brain regulate important morphological events in embryonic development. Memories of past experiences, and our ability to learn new information, is processed in a region of the brain called the hippocampus. In order for this to occur, the cells that make up the hippocampus must form correctly during embryonic development. This proposal investigates the cellular and molecular mechanisms regulating hippocampal formation. The national benefit of ....Specialized glial cells within the hippocampus of the brain regulate important morphological events in embryonic development. Memories of past experiences, and our ability to learn new information, is processed in a region of the brain called the hippocampus. In order for this to occur, the cells that make up the hippocampus must form correctly during embryonic development. This proposal investigates the cellular and molecular mechanisms regulating hippocampal formation. The national benefit of this work is to provide basic knowledge about the processes that underlie correct brain formation and function, and to understand what processes are disrupted when the brain fails to function correctly. Such disruptions lead to mental retardation and learning difficulties, and in the aged, an inability to form and store new memories, as occurs in dementia.Read moreRead less
A contractile cochlear frame - a possible new mechanism of sound adaptation. It is generally accepted that the rigid frame that harbours sensory structures in the hearing organs of modern higher vertebrates has only a passive supporting role. We have discovered a contractile component in the cartilaginous cochlear frame of the lizard Teratoscincus scincus and demonstrated that the tonus of the contractile tissue can be regulated. We hypothesize a new, previously unknown mechanism of slow mechani ....A contractile cochlear frame - a possible new mechanism of sound adaptation. It is generally accepted that the rigid frame that harbours sensory structures in the hearing organs of modern higher vertebrates has only a passive supporting role. We have discovered a contractile component in the cartilaginous cochlear frame of the lizard Teratoscincus scincus and demonstrated that the tonus of the contractile tissue can be regulated. We hypothesize a new, previously unknown mechanism of slow mechanical adaptation in the vertebrate hearing organ. The aim of the proposed project is to examine this hypothesis in more detail.
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How the gut nervous system interacts with bacteria. This project aims to reveal how the enteric nervous system of the gastrointestinal (GI) tract interacts with the gut microbiota. Gut function has largely been studied without considering microbiota. The project will use genetically modified animal models, image analysis of gut motility and sequencing of gut microbes, and develop neurophysiological methods to understand gut function. Expected benefits include better understanding of mechanisms u ....How the gut nervous system interacts with bacteria. This project aims to reveal how the enteric nervous system of the gastrointestinal (GI) tract interacts with the gut microbiota. Gut function has largely been studied without considering microbiota. The project will use genetically modified animal models, image analysis of gut motility and sequencing of gut microbes, and develop neurophysiological methods to understand gut function. Expected benefits include better understanding of mechanisms underlying antibiotic resistance, risks associated with discretionary caesarean sections and the benefits of breastfeeding.Read moreRead less