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A Longitudinal Study Of Nerve Morphology In Diabetic Neuropathy Using Novel Non-invasive Ophthalmic Surrogate Markers
Funder
National Health and Medical Research Council
Funding Amount
$540,372.00
Summary
This research project will use two new ophthalmic instruments - the corneal confocal microscope and non-contact corneal aesthesiometer - to directly monitor changes in corneal nerves and corneal sensitivity, over a 5 year period, in diabetic patients suffering from a painful condition of the arms and legs known as diabetic neuropathy. This study will generate important new information that could allow diabetic doctors to more accurately monitor the progression of the disease.
The Role Of Hypoxia Inducible Factor 1a In Beta-Cell Function And Diabetes
Funder
National Health and Medical Research Council
Funding Amount
$362,303.00
Summary
HIF1a is a gene which our preliminary data shows is needed for normal beta-cell function and insulin secretion. When beta-cells cannot release enough insulin, blood sugar levels rise, and diabetes develops. This research plan will look at the effects of deletion of HIF1a and of increasing HIF1a to see how this affects function of beta-cells and - or diabetes development. This work may show that HIF1a is a potential therapeutic target for the treatment of diabetes in humans.
The Characterisation Of The Glycolytic Pathway And TCA Cycle On First And Second Phase Insulin Secretion
Funder
National Health and Medical Research Council
Funding Amount
$85,716.00
Summary
In normal individuals, special cells in the pancreas - beta cells - secrete insulin. Insulin controls blood glucose. However, in diabetes, these beta cells have failed and are unable to perform their function, possibly due to faulty energy production. This project examines the underlying biochemical processes, in particular the energy requirements for insulin secretion. If we can repair this fault, it could identify novel targets for the treatment of diabetes.
Interactions Between Advanced Glycation And Oxidative Stress In Diabetic Renal And Cardiac Complications
Funder
National Health and Medical Research Council
Funding Amount
$431,700.00
Summary
Kidney and heart disease are serious complications of diabetes. These complications are the major cause of disability and premature death in the western world. Studies from our group and others have shown that diabetic complications appear to be a consequence of a number of different processes. These pathways include a sugar dependent pathway of irreversible interactions between proteins such as collagen and sugar known as advanced glycation. The process of advanced glycation alters the body's a ....Kidney and heart disease are serious complications of diabetes. These complications are the major cause of disability and premature death in the western world. Studies from our group and others have shown that diabetic complications appear to be a consequence of a number of different processes. These pathways include a sugar dependent pathway of irreversible interactions between proteins such as collagen and sugar known as advanced glycation. The process of advanced glycation alters the body's ability to renew these protein, hence causing accelration of the ageing process. In fact, it is estimated that this process occurs almost fifty times faster in diabetes. These sticky complexes accumulate in tissues causing disruption ot the normal tissue structure. Our group has a drug which can act as scissors and cut the sticky sugar off the proteins allowing it to be turned over. Unfortunately this does not fix all of the damage. These AGE molecules are involved in a number of other harmful processes including the production of toxic oxygen derived molecules which are harmful byproducts of diabetes. While these oxygen 'radicals' have been implicated in heart attack and stroke their source has remained a mystery in diabetes. Previously, the only way to remove these molecules was to mop them up with antioxidants such as Vitamin E. Antioxidants work slowly and so some damage is already done before they 'detoxify' these oxygen radicals. We propose to use combinations of medicines to see if we can achieve more effective protection against these processes in experimental diabetes. This may provide new therapies for threatment of kidney and heart disease in diabetes.Read moreRead less
Investigating The Physiological And Clinical Differences In Weight Loss In Obese Subjects With And Without Diabetes.
Funder
National Health and Medical Research Council
Funding Amount
$101,726.00
Summary
Obesity and type 2 diabetes are linked by the production of inflammatory factors in the body. These factors seem to link weight gain, especially around the abdomen, not only with insulin resistance, the precursor to diabetes, but also independently with the development with heart and kidney disease and reduced fertility. This study will investigate the effect of dieting and weight loss on inflammation and the function of the heart and other organs in obese people with and without diabetes.
Characterisation Of Novel AGE Binding Proteins: Implications For Diabetic Vascular Complications.
Funder
National Health and Medical Research Council
Funding Amount
$210,990.00
Summary
This project will explore a process known as advanced glycation and in particular how this may lead to organ injury in diabetes. Diabetes is characterised by sustained elevation of blood glucose levels which interact with proteins to generate products known as advanced glycation end-products (AGEs). These AGEs bind to other proteins some of which have been isolated and are considered receptors. Our own group has identified a new family of proteins known as ERM proteins which bind to AGEs. This i ....This project will explore a process known as advanced glycation and in particular how this may lead to organ injury in diabetes. Diabetes is characterised by sustained elevation of blood glucose levels which interact with proteins to generate products known as advanced glycation end-products (AGEs). These AGEs bind to other proteins some of which have been isolated and are considered receptors. Our own group has identified a new family of proteins known as ERM proteins which bind to AGEs. This is a highly novel finding which now needs to be examined in more detail. The ERM proteins which include ezrin, radixin and moiesin are found at many sites of diabetic complications including the kidney, retina and blood vessel wall. They have a number of functions including effects on cell adhesion and cell structure. This is important in diabetes where changes in cells including altered structure have been observed. This grant will characterise the interactions between AGEs and ERM proteins at the molecular and cellular level. It will define how AGEs influence cells via interactions with ERM proteins. These studies have the potential to lead to treatments that may modulate the AGE-ERM interactions, thereby retarding or preventing diabetic vascular complications. These complications are of important clinical significance since they are the major cause of morbidity and mortality in the diabetic population. Furthermore, diabetes is a major cause of premature atherosclerosis in our community, diabetic kidney disease is the leading cause of end-stage renal failure in the Western world and diabetic retinopathy (eye disease) is the main cause of blindness in the working age population.Read moreRead less
Effect Of Oral Glutamine On GLP-1 And Insulin Secretion And Glycaemia In Humans.
Funder
National Health and Medical Research Council
Funding Amount
$397,444.00
Summary
Diabetes is an ever increasing problem with serious complications. We will investigate whether glutamine, one of the most common amino acids (protein building blocks) in the body, has a beneficial effect on blood glucose and insulin levels in the body in people who have type 2 (non-insulin dependent) diabetes. If so, glutamine supplementation may represent a novel, cheap and palatable way of improving outcomes and preventing the development of complications in people with type 2 diabetes.
Investigation Of The Genetic Basis Of Insulin Hypersecretion In A Mouse Model Of Pancreatic Islet Failure
Funder
National Health and Medical Research Council
Funding Amount
$406,980.00
Summary
Type 2 diabetes is a chronic disease that is associated with blindness, kidney failure, heart attacks and stroke and these are secondary to high blood sugar levels. Thus, determining the cause of high blood sugar levels in type 2 diabetes will lead to better management of the disease and ease the financial burden on the public health system. High blood sugar in type 2 diabetes results from the inability of the body to secrete enough insulin. Insulin is the main hormone that lowers blood sugar le ....Type 2 diabetes is a chronic disease that is associated with blindness, kidney failure, heart attacks and stroke and these are secondary to high blood sugar levels. Thus, determining the cause of high blood sugar levels in type 2 diabetes will lead to better management of the disease and ease the financial burden on the public health system. High blood sugar in type 2 diabetes results from the inability of the body to secrete enough insulin. Insulin is the main hormone that lowers blood sugar levels and is produced by the pancreas. The reason for reduced insulin secretion in type 2 diabetes is not known. Paradoxically, it has been shown that some people who are at an increased risk of developing diabetes (eg people with obesity or a family history of diabetes) secrete more insulin than normal. It is not clear why this is, but a few studies have suggested that reducing insulin secretion in these circumstances can protect the pancreas and preserve its ability to secrete the appropriate amount of insulin. The DBA-2 is a mouse strain that like humans with type 2 diabetes, its pancreas can also fail to secrete the appropriate amount of insulin and under these circumstances becomes diabetic. Furthermore our laboratory has generated evidence that shows that like people who are at risk of diabetes, DBA-2 mice in fact secrete more insulin prior to becoming diabetic. Whether the cause of this increased insulin secretion is linked to the eventual reduction of secretion is not known. The aim of this study is to identify the gene that causes increased insulin secretion in the DBA-2 mouse. Furthermore, genetically manipulated animals will be produced that contain only this gene to determine its effect on insulin secretion. Should the identification of this gene be related to the eventual failure of the pancreas to secrete enough insulin, then it would provide a target for drug therapy to correct insulin levels and therefore reduce blood sugar levels.Read moreRead less
The Role Of Endoplasmic Reticulum (ER) Stress In Pancreatic Beta-cell Dysfunction.
Funder
National Health and Medical Research Council
Funding Amount
$85,775.00
Summary
Diabetes results from pancreatic ß-cell failure which is characterised by insulin secretory defects and ß-cell destruction. This is mediated by inflammatory cytokines in type 1 diabetes and by high levels of fat in type 2 diabetes. The mechanisms by which ß-cells fail remain to be clarified but they are important considering the current epidemic of diabetes in Australia. This project will enhance our understanding of ß-cell failure and may provide therapeutic targets for diabetes treatment.