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Short-term Effects Of Overfeeding On Metabolic Risk In Humans
Funder
National Health and Medical Research Council
Funding Amount
$417,196.00
Summary
The prevalence of obesity is rapidly increasing in Australia and other parts of the world. Obesity is closely associated with insulin resistance and plays a role in the development of type 2 diabetes. However, the effects of short-term periods of over nutrition in humans remain unclear. In the proposed study, we will investigate the effects of short-term weight gain by high fat feeding in lean subjects, in subjects who are overweight and in subjects who are genetically more likely to develop dia ....The prevalence of obesity is rapidly increasing in Australia and other parts of the world. Obesity is closely associated with insulin resistance and plays a role in the development of type 2 diabetes. However, the effects of short-term periods of over nutrition in humans remain unclear. In the proposed study, we will investigate the effects of short-term weight gain by high fat feeding in lean subjects, in subjects who are overweight and in subjects who are genetically more likely to develop diabetes (due to strong family history). The aims are to distinguish physiological and endocrine characteristics of individuals who store more fat in response to overfeeding. We will identify differences between these individuals and whether they have defects in upregulating machinery involved in fat oxidation and energy production in skeletal muscle that may help them adapt during to energy excess. We will look for changes in type 2 diabetes risk and we will have the potential to identify defects in factors that are involved in this response. We will also re-examine indivudals again after calorie restriction and weight loss. We also plan to confirm the role of the candidate genes involved in fat oxidation that have been identifieid in human studies by in vivo gene transfer technology in rodents. This study will determine whether overweight and lean subjects behave similarly when faced with an overfeeding challenge. We expect that individuals with a genetic predisposition for T2DM will become more IR, due to metabolic inflexibility and a decreased ability to upregulate machinery involved in fatty acid oxidation and mitochondrial function. By characterising the physiological and endocrine responses to overfeeding, we will establish quantifiable markers allowing us to distinguish those at risk and identify new targets for pharmacological or lifestyle intervention.Read moreRead less
Gastric Counter-regulation Of Hypoglycaemia: Studies In Health And Diabetes
Funder
National Health and Medical Research Council
Funding Amount
$357,193.00
Summary
Insulin injections are often needed to treat diabetes, but they can cause low blood sugar levels (hypoglycaemia), which are usually distressing, and sometimes fatal. The stomach is important in regulating blood sugar; in response to hypoglycaemia, it empties food much more rapidly, allowing carbohydrate to be absorbed faster to normalise blood sugar levels. The proposed studies will explore this important area, in order to develop better ways of preventing and treating hypoglycaemia.
Does Loss Of Melanocortin Glucose Sensing Contribute To Obesity Induced Diabetes?
Funder
National Health and Medical Research Council
Funding Amount
$617,531.00
Summary
Diabetes is a failure to properly regulate blood glucose levels. Escalating rates of diabetes are a major health problem. Melanocortin neurons in the brain detect blood sugar levels and usually regulate glucose production and utilization, but in obese animals they do not. We have developed a possible therapeutic, which appears to reverse the glucose insensitivity, and rapidly reduces blood glucose in diabetic mice. This project will determine how melanocortins act to regulate glucose levels
Type 1 Diabetes And The Metabolic Syndrome: Defining This Modern-day Phenotype, And Exploring The Effects Of Exercise On Glycaemic Control And Both Traditional And Novel Diabetes Complications
Funder
National Health and Medical Research Council
Funding Amount
$122,714.00
Summary
This research aims to define trends in the prevalence of, and complications associated with, metabolic syndrome in adults with type 1 diabetes, using the Australian National Diabetes Information Audit and Benchmarking Initiative (ANDIAB). Subsequently, a randomised controlled trial will examine the effect of exercise on glycaemic control and diabetes complications risk profiles in this group. These studies will thus address disease profiles and a potential beneficial clinical intervention.
Intervention To Reduce The Risk Of Diabetic Retinopathy And Early Adverse Retinal Changes In Type 1 Diabetes
Funder
National Health and Medical Research Council
Funding Amount
$1,294,846.00
Summary
The long term effects of young onset T1D may be devastating: diabetes is the leading cause of visual loss in young adults in Australia and other countries. We have the unique opportunity to investigate whether ACEI and statins will modify retinopathy through our collaboration with an already funded international multicentre trial. This study will treat adolescents for 4 years and will follow them for the next 5-10 years. We will use novel measures of retinal blood vessels size and fractals.
Epigenetic Determinants Of Nephropathy In Adults With Type 1 Diabetes
Funder
National Health and Medical Research Council
Funding Amount
$532,118.00
Summary
The prevention and successful management of diabetic complications are issues of utmost importance for the health of Australians. We hypothesize that epigenetic pathways partly determine why some individuals with diabetes develop complications of their disease, while others do not, despite a similar duration of diabetes, treatment intensity and mean glucose exposure.
Investigation Of Pancreatic Insulin-secreting Cell Function And Survival
Funder
National Health and Medical Research Council
Funding Amount
$375,750.00
Summary
Diabetes remains a major health problem in Australia. Both type 1 and type 2 diabetes is eventually due to pancreatic insulin-producing beta-cell destruction, which is caused mainly by the cell death, so called 'apoptosis' or programmed suicide of the cells. Thus, attempting to protect beta-cells against death and rescue their insulin secretory function is emerging as a strategy for the treatment of diabetes. However, how the beta-cells undergo death and how to protect the cell death are still n ....Diabetes remains a major health problem in Australia. Both type 1 and type 2 diabetes is eventually due to pancreatic insulin-producing beta-cell destruction, which is caused mainly by the cell death, so called 'apoptosis' or programmed suicide of the cells. Thus, attempting to protect beta-cells against death and rescue their insulin secretory function is emerging as a strategy for the treatment of diabetes. However, how the beta-cells undergo death and how to protect the cell death are still not completely understood. We have recently discovered a new protein, named sphingosine kinase, that is a strong protector against cell death. We also found that this enzyme is involved in process of insulin secretion. Thus, this application seeks to establish a dual role of this enzyme in protecting beta-cells from death and promoting insulin secretion by the cells. This will ultimately allow us to create new therapeutic strategy to target this protein for the management of diabetes.Read moreRead less