The Role Of Microglia In Early Diabetic Retinopathy
Funder
National Health and Medical Research Council
Funding Amount
$665,582.00
Summary
Diabetic retinopathy is one of the most feared complications of diabetes. This project will examine the role that retinal immune cells called microglia have in causing early changes in the vasculature. We will examine whether diabetes changes the way neurons communicate with blood vessels, opening up a possible treatment target that could prevent the progression to more advanced disease.
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.Read moreRead less
Retinal Endothelial Cell Changes That Precede Retinal Vein Occlusion And The Retinal Extracellular Space Changes That Follow It
Funder
National Health and Medical Research Council
Funding Amount
$118,121.00
Summary
Dr. Min Hye Kang, at The University of Western Australia, is investigating microscopic blood vessel changes that precede the onset of devastating blindness. She is also studying functional changes that occur in the retina following deprivation of its blood supply. Her research has significantly improved our understanding of cellular mechanisms that lead to blindness. It has also aided in the development of new treatment strategies for the prevention of vision loss.
INcidence And Progression Of Retinal Microvascular Signs In An Older Australian Cohort
Funder
National Health and Medical Research Council
Funding Amount
$62,022.00
Summary
This project aims to investigate the evolution of retinal microvascular signs and associated factors in an older, general population. 1. To investigate the 5-year and the 10-year incidence, progression and regression of retinal vascular wall signs in an older Australian population; 2. To relate the incidence, progression and regression of retinal vascular wall signs to cardiovascular risk factors (a: age, blood pressure; b: metabolic factors such as BMI, lipids and glucose levels); 3. To investi ....This project aims to investigate the evolution of retinal microvascular signs and associated factors in an older, general population. 1. To investigate the 5-year and the 10-year incidence, progression and regression of retinal vascular wall signs in an older Australian population; 2. To relate the incidence, progression and regression of retinal vascular wall signs to cardiovascular risk factors (a: age, blood pressure; b: metabolic factors such as BMI, lipids and glucose levels); 3. To investigate the incidence, progression and regression of retinal vascular wall signs in relation to inflammatory markers (white cell count, fibrinogen, hematocrit, platelet count); 4. To investigate the incidence, progression and regression of retinal vascular wall signs in relation to medication use (a: anti-hypertensive medications; b: aspirin and other NSAIDs; c. steroid use); 5. To relate the incidence, progression and regression of retinal vascular wall signs to specific lifestyle behaviours (alcohol consumption, smoking, exercise); 6. To investigate the incidence, progression and regression of retinal vascular wall signs and hormone replacement therapy use in women.Read moreRead less
Genetic Associations Of Early Retinal Pathologic Phenotypes: Data Pooling And Meta-analyses Of Multiple Populations
Funder
National Health and Medical Research Council
Funding Amount
$736,481.00
Summary
We aim to use data already collected from multiple population-based studies to investigate the likely pathogeneses of early retinal phenotypes that are either markers for cardiovascular risk or precursors of a blinding condition. Understanding if there are genetic susceptibilities for these phenotypes, and if so, how they together with environmental exposures jointly influence the occurrence of the diseases may be key to reduce the burden from cardiovascular disease and blindness.
Investigating The Mechanisms Underpinning The Dynamic Vessel Response In People With Diabetic Retinopathy
Funder
National Health and Medical Research Council
Funding Amount
$18,808.00
Summary
Endothelial dysfunction has been well-hypothesised as one of the key players in the pathogenesis of DR. However, there is strong evidence suggesting a neurovascular coupling mechanism in the retinal circulation during flicker. It is therefore unclear whether reduced flicker light induced vasodilation observed in diabetes and DR is associated with endothelial dysfunction, an impairment of neurovascular coupling or both. This project aims to address this important knowledge gap.
Early Retinal Vessel Changes In Diabetes And The Metabolic Syndrome
Funder
National Health and Medical Research Council
Funding Amount
$212,500.00
Summary
Diabetes mellitus affects a large proportion of adult Australians. Furthermore, many non-diabetic Australians are at high risk of developing diabetes (e.g., people with lesser glucose abnormalities, and those who are obese, have high blood pressure, or have high lipid levels). It has been suggested that diseases affecting small blood vessels (microvascular disease) in the body is closely related to the development of both diabetes and the pre-diabetes state. The current study will examine the re ....Diabetes mellitus affects a large proportion of adult Australians. Furthermore, many non-diabetic Australians are at high risk of developing diabetes (e.g., people with lesser glucose abnormalities, and those who are obese, have high blood pressure, or have high lipid levels). It has been suggested that diseases affecting small blood vessels (microvascular disease) in the body is closely related to the development of both diabetes and the pre-diabetes state. The current study will examine the relationship of microvascular disease in the retina (at the back of the eye) to diabetes, pre-diabetes status and diabetes complications. We will use a computer-imaging technique to measure the diameters of retinal blood vessel from digital photographs taken in 2,177 participants of the 1999-2000 Australian Diabetes, Obesity and Lifestyle (AusDiab) Study, a community-based survey of people aged 25 years and older examining risk factors and complications of diabetes. In the proposed study, we aim to answer the following questions: 1) Are changes in the retinal blood vessel diameter (e.g., narrowed or dilated vessels) associated with diabetes and pre-diabetes? 2) Are these retinal vessel changes related to obesity, high blood pressure and high lipid levels? 3) Are retinal vessel changes related to diabetes complications, such as heart disease, kidney disease, nerve problems and foot ulcers? 4) Do retinal vessel diameter changes predict people who will subsequently develop diabetes, irrespective of their risk factor profile? Using this well-characterized population, and existing digital retinal photographs, the proposed study will offer a unique and cost-effective opportunity to address important gaps in our understanding of how diabetes and pre-diabetes develop, and whether they are related to microvascular diseases. This may ultimately lead to new treatment and preventive approaches targeted at the small blood vessels in the body.Read moreRead less
New Dynamometric Techniques For Predicting Glaucoma Progression
Funder
National Health and Medical Research Council
Funding Amount
$171,825.00
Summary
Glaucoma is a major cause of blindness in our community. The biggest risk factor for glaucoma is raised intraocular pressure. However, the exact cause of the disease remains unknown. Through our basic science studies in animals we have discovered that changes in blood flow in the vessels at the optic disk may be involved in the disease process. In recent clinical trials we discovered that the presence or absence of pulsations in the retinal veins at the disk was both an indicator of severity and ....Glaucoma is a major cause of blindness in our community. The biggest risk factor for glaucoma is raised intraocular pressure. However, the exact cause of the disease remains unknown. Through our basic science studies in animals we have discovered that changes in blood flow in the vessels at the optic disk may be involved in the disease process. In recent clinical trials we discovered that the presence or absence of pulsations in the retinal veins at the disk was both an indicator of severity and progression of glaucoma. This is a major breakthrough because there is no other means of predicting in which glaucoma patients vision loss will develop most rapidly. This information will be very helpful in deciding which patients should have the most agressive treatment to restore normal intraocular pressure. This project seeks to develop a new commercial device to make such an examination easy for any clinical ophthalmologist. The device allows the doctor to examine the vessels at the disk whilst applying slight pressure to the eye to temporarily raise intraocular pressure. A footswitch is pressed when the doctor sees the vessels pulsate. The required force is recorded by a laptop computer and the data stored along with the patients details. Now we have confirmed the ability of such a measurement to predict the rate of visual field loss in glaucoma, such a measurement will become much more widespread in clinical ophthalmology, offering a new and large scale opportunity for such instrumentation. Our device will be easy to operate, more comfortable for the patient, and will be of major diagnostic value in glaucoma clinics worldwide.Read moreRead less
Retinal Vascular Signs As Risk Markers For Incident Stroke Or Cerebrovascular Death: A Population-based Assessment
Funder
National Health and Medical Research Council
Funding Amount
$410,199.00
Summary
Stroke remains a major cause of disability and death in Australia. Preliminary data from the Blue Mountains Eye Study suggest that blood vessel changes observed in the retina at the back of the eye may provide signs of an increased risk of stroke or death from stroke. Importantly, although stroke is strongly associated with elevated blood pressure, the risk associated with these blood vessel signs seems to be independent of blood pressure. The proposed study will conduct a detailed re-grading of ....Stroke remains a major cause of disability and death in Australia. Preliminary data from the Blue Mountains Eye Study suggest that blood vessel changes observed in the retina at the back of the eye may provide signs of an increased risk of stroke or death from stroke. Importantly, although stroke is strongly associated with elevated blood pressure, the risk associated with these blood vessel signs seems to be independent of blood pressure. The proposed study will conduct a detailed re-grading of retinal photographs taken on people who attended the Eye Study during 1992-4 and 5-year follow-up exams during 1997-9. We will grade these photographs manually (using a stereo-viewer), and with computer assistance to measure changes in the diameter of small arteries in the retina and other signs. By closely matching our grading technique to that used in a large American Study, we hope to develop reliable grading for these signs and will be able to compare our findings internationally. Our aim is to assess the frequency of abnormal retinal vessel changes in people of different age groups as well as the development and progression of these signs over time. Their relationship to well known vascular risk factors like smoking, blood pressure, obesity, diabetes and cholesterol will also be investigated. We hope to be able to discriminate those changes associated with an increased stroke risk from those due to normal ageing. We expect that the increased stroke risk associated with abnormal retinal vessel changes may be greater than shown in our early data. If confirmed, then these findings may provide a more sensitive and objective measure of stroke risk than relying on traditional risk factors, which are difficult to quantify and change with time. We may be able to develop simple rules so that doctors using an ophthalmoscope or examining a retinal photograph could identify high risk patients. These people could benefit from interventions to reduce their risk.Read moreRead less
Do Retinal Microvascular Signs Predict Ischaemic Heart Disease Subtype? The Australian Heart Eye Study (AHES)
Funder
National Health and Medical Research Council
Funding Amount
$65,532.00
Summary
Narrowing of the large vessels of the heart and abnormal function of the small vessels are both causes of coronary heart disease and chest pain.There are few non-invasive investigations to help differentiate between large and small vessel disease and assess one’s risk of developing disease in the future.The study uses retinal photography and coronary angiography to assess whether changes in the structure of the blood vessels of the eye may be used to identify the type of coronary heart disease a ....Narrowing of the large vessels of the heart and abnormal function of the small vessels are both causes of coronary heart disease and chest pain.There are few non-invasive investigations to help differentiate between large and small vessel disease and assess one’s risk of developing disease in the future.The study uses retinal photography and coronary angiography to assess whether changes in the structure of the blood vessels of the eye may be used to identify the type of coronary heart disease as well as the risk of future cardiac events.Read moreRead less