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Research Topic : Oxygen-induced retinopathy
Field of Research : Opthalmology And Vision Science
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  • Funded Activity

    INTRARETINAL OXYGEN CONSUMPTION AND THE PREVENTION OF HYPOXIA IN RETINAL ISCHEMIA

    Funder
    National Health and Medical Research Council
    Funding Amount
    $164,444.00
    Summary
    Adequate oxygen supply to the retina is critical for normal visual function. The oxygen is normally supplied by the blood flowing in the two circulations that support the retina. These are the choroidal circulation, lying behind the retina, and the retinal circulation, which supports the front half of the retina. The retinal circulation is particularly vulnerable to vascular disease and insufficient blood flow (ischemia). Vascular changes are involved in a wide range of retinal diseases which ar .... Adequate oxygen supply to the retina is critical for normal visual function. The oxygen is normally supplied by the blood flowing in the two circulations that support the retina. These are the choroidal circulation, lying behind the retina, and the retinal circulation, which supports the front half of the retina. The retinal circulation is particularly vulnerable to vascular disease and insufficient blood flow (ischemia). Vascular changes are involved in a wide range of retinal diseases which are currently responsible for the majority of new blindness in our community. The choroidal circulation is relatively robust, and offers a potential avenue for increasing oxygen delivery to the retina in the clinical management of ischemic retinal diseases. The feasibility of such an approach is strongly dependent on the oxygen requirements of the retina, and how this is influenced by retinal ischemia. We plan to find out how much oxygen is consumed by the many different layers within the retina under normal conditions and then determine how this changes under ischemic conditions. We will then see if we can supply enough oxygen from the choroid by a combination of raising the oxygen content of the blood, increasing choroidal blood flow, and reducing the amount of oxygen used by the outer half of the retina. Our experiments will be done in laboratory rats, but the same principles are readily transferable to humans if they prove to be beneficial in protecting the retina from ischemic damage. Our study will also quantify the relationship between oxygen levels in the blood stream, and those in the different layers of the retina. This information may prove valuable in the treatment and the prevention of other retinal diseases where the manipulation of the intraretinal oxygen environment is an exciting new avenue of research.
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    Receptor-mediated Actions Of Prorenin In Diabetic Retinopathy

    Funder
    National Health and Medical Research Council
    Funding Amount
    $733,841.00
    Summary
    Despite improvements in patient care, the incidence of diabetic retinopathy is dramatically increasing. Recent evidence suggests that a component of a hormonal system, called prorenin, may participate in the development of diabetic organ disease. We will evaluate the role of prorenin in vascular and nerve damage in animal models of diabetic retinopathy. We will determine if a new inhibitor of prorenin, prevents retinal injury and is a potential treatment for diabetic retinopathy.
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    Funded Activity

    Uncoupled Research Fellowship

    Funder
    National Health and Medical Research Council
    Funding Amount
    $558,000.00
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    Funded Activity

    Photoinhibition Of Retinal Mitochondria And Oxygen Consumption

    Funder
    National Health and Medical Research Council
    Funding Amount
    $57,921.00
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    Funded Activity

    Novel Therapies For Diabetic Retinopathy

    Funder
    National Health and Medical Research Council
    Funding Amount
    $101,379.00
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    Funded Activity

    Advanced New Therapeutics And Diagnostics In Retinal Diseases And Glaucoma

    Funder
    National Health and Medical Research Council
    Funding Amount
    $3,550,944.00
    Summary
    This program proposal targets the most common blinding diseases in clinical ophthalmology. The applicant team includes research and clinical ophthalmologists and basic scientists. The team have an internationally established reputation in bringing basic science discoveries to the point where they can impact directly on clinical diagnosis and therapy. The proposed research includes new treatment therapies for diabetic retinopathy, age related macular degeneration, and retinal vascular diseases. A .... This program proposal targets the most common blinding diseases in clinical ophthalmology. The applicant team includes research and clinical ophthalmologists and basic scientists. The team have an internationally established reputation in bringing basic science discoveries to the point where they can impact directly on clinical diagnosis and therapy. The proposed research includes new treatment therapies for diabetic retinopathy, age related macular degeneration, and retinal vascular diseases. A new diagnostic technique for glaucoma and new instrumentation for detecting areas of poor blood flow and oxygen supply in the eye are also to be developed. Past successes in our current program grant make us confident that we can produce clinically useful outcomes from this new proposal.
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    Funded Activity

    Translational Clinical Research In Major Eye Diseases (TCR-Eye)

    Funder
    National Health and Medical Research Council
    Funding Amount
    $2,552,355.00
    Summary
    The four eye diseases that cause the majority of vision loss in Australia, age-related macular degeneration, diabetic retinopathy, cataract and glaucoma, impose a significant socio-economic burden, costing our nation -$lo billion a year. This CCRE will fund a world leading, broad-based, clinical and translational research program in Melbourne and Sydney to tackle these eye diseases. The new knowledge and innovative clinical strategies developed in this CCRE will impact on clinical ophthalmology .... The four eye diseases that cause the majority of vision loss in Australia, age-related macular degeneration, diabetic retinopathy, cataract and glaucoma, impose a significant socio-economic burden, costing our nation -$lo billion a year. This CCRE will fund a world leading, broad-based, clinical and translational research program in Melbourne and Sydney to tackle these eye diseases. The new knowledge and innovative clinical strategies developed in this CCRE will impact on clinical ophthalmology and the practice of other medical disciplines.
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    Funded Activity

    Functional Recovery From Retinal Degeneration: Genetic, Environmental And Senescent Models

    Funder
    National Health and Medical Research Council
    Funding Amount
    $265,888.00
    Summary
    This project is directed towards treatment for the blindness caused by retinal degeneration. The retina of the eye degenerates in several groups of diseases, and from several causes. Many cases affect young people and result from small genetic mutations in key proteins. Many appear to be caused by environmental damage to the retina, perhaps at birth. Retinal degeneration causes progressive blindness in a minority of younger people (about 1 in 4,000, so 5,000 Australians and 1-2 million people wo .... This project is directed towards treatment for the blindness caused by retinal degeneration. The retina of the eye degenerates in several groups of diseases, and from several causes. Many cases affect young people and result from small genetic mutations in key proteins. Many appear to be caused by environmental damage to the retina, perhaps at birth. Retinal degeneration causes progressive blindness in a minority of younger people (about 1 in 4,000, so 5,000 Australians and 1-2 million people world-wide). This condition is known as Retinitis pigmentosa. However, the normal retinal undergoes a slow loss of photoreceptors whose effect is cumulative, so that the vision of all peoples slowly fades towards the blindness of old age. In this form, retinal degeneration affects potentially everyone. We have recently published an 'oxygen toxicity' theory of retinal degeneration to account for both retinitis pigmentosa and senescent degeneration. The theory applies whether the dystrophy is preciptated by genetic mutation or by environmental factors . By the time a person becomes aware of blindness (commonly night blindness) from retinal degeneration, the loss of vision results (it is argued) from 2 causes: the death of some photoreceptors (the retinal cells which detect light) and damage to surviving photoreceptors. Both death and damage are caused by oxygen toxicity, arising from particular features of the retina's metabolism and blood supply. Further, the relentless progression of the blindness is inherent in the mechanisms of oxygen toxicity. In preliminary work we have been able to slow retinal degenerations and, importantly, to restore function in degenerating retinas by countering the oxygen toxicity. Experiments are proposed to expand this evidence and explore the time course, permanence and generality of these effects. The tests of retinal recovery and stability, and the mechanisms of countering oxygen toxicity will be readily applicable to clinical trials.
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    Funded Activity

    Characterizing Novel Therapeutic Interventions In A New Model Of Focal Retinopathy

    Funder
    National Health and Medical Research Council
    Funding Amount
    $536,794.00
    Summary
    Focal retinopathies such as age-related macular degeneration pose an immense burden on our society, both socially and economically. We have recently developed an animal model that allows us to investigate for the first time, drugs and therapies that might be used to treat AMD both after its onset, and more significantly, in at-risk populations before onset of the disease.
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    Funded Activity

    Development Of The Primate Fovea

    Funder
    National Health and Medical Research Council
    Funding Amount
    $196,527.00
    Summary
    The fovea is a specialized part of the retina which enables us to see fine detail. The fovea is characterised by an extremely high concentration of photoreceptor cells in a small, prescribed area to detect detail in the pattern of light reaching the retina. Each of these photoreceptor cells is connected to at least four other cells within the retina, which further refine the information coded by the photoreceptors. Because this circuitry involves so many cells, the retina has a tendency to be th .... The fovea is a specialized part of the retina which enables us to see fine detail. The fovea is characterised by an extremely high concentration of photoreceptor cells in a small, prescribed area to detect detail in the pattern of light reaching the retina. Each of these photoreceptor cells is connected to at least four other cells within the retina, which further refine the information coded by the photoreceptors. Because this circuitry involves so many cells, the retina has a tendency to be thick at the specialized area. However, in development the cells connected to the foveal photoreceptors move away from the central concentration of photoreceptors, still keeping their contacts with them. This results in thinning of the retina locally, so it has a volcanoe-like formation at the fovea, in which photoreceptors are concentrated within the crater and the displaced cells are accumulated on the rim. The events which trigger these cell displacements that form the fovea are unknown. We propose to investigate growth factors which signal between the fovea and the developing blood supply, and the relationship between the formation of the fovea and neuronal activity. This study will provide a new perspective on factors which affect central visual function and its vulnerability to insult in premature infants and in aging.
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