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Novel Approaches To Pathogenesis, Diagnosis &treatment Of Autoimmune Diseases Based On New Insights Into Thymus-dependen
Funder
National Health and Medical Research Council
Funding Amount
$1,045,422.00
Summary
An individual relies upon their immune system to protect against invasion by hostile organisms. The system usually works well. Invading agents (the 'non-self') are detected and attacked by the immune system's patrolling killer T cells. These normally beneficial cells are called T cells because they were formed and educated in an organ called the thymus, which kick-starts our immune system in childhood, but falls into inactivity by adolescence. Sometimes the education system in the thymus goes wr ....An individual relies upon their immune system to protect against invasion by hostile organisms. The system usually works well. Invading agents (the 'non-self') are detected and attacked by the immune system's patrolling killer T cells. These normally beneficial cells are called T cells because they were formed and educated in an organ called the thymus, which kick-starts our immune system in childhood, but falls into inactivity by adolescence. Sometimes the education system in the thymus goes wrong and it releases T cells that mistakenly attack 'self' instead of 'non-self'. This causes autoimmune diseases, such as type1 diabetes, multiple sclerosis and rheumatoid arthritis. The Euro-Thymaide project aims to determine why and how self-attacking T cells are mistakenly released from the thymus into the body. Usually such errant T cells are detected and destroyed within the thymus, before they have the opportunity to escape and cause autoimmune diseases. The ultimate objective is to learn about the thymus recognition process and help the immune system detect and destroy faulty T cells that patrol the body, thereby preventing the onset of autoimmune diseases.Read moreRead less
An Autoantibody In Type 1 Diabetes That Mediates Autonomic Complications
Funder
National Health and Medical Research Council
Funding Amount
$254,591.00
Summary
Type 1 diabetes is a chronic autoimmune disease characterised by destruction of insulin producing cells in the pancreas. One of the most common and serious complications of type 1 diabetes is disruption of the autoimmune nervous system, and once symptoms appear the 5-year mortalityrate is approximately 50%. Symptoms of autonomic dysfunction can be extensive, and involve the stomach, intestine, bladder, heart and reproductive organs. Currently, the management of autonomic dysfunction remains prim ....Type 1 diabetes is a chronic autoimmune disease characterised by destruction of insulin producing cells in the pancreas. One of the most common and serious complications of type 1 diabetes is disruption of the autoimmune nervous system, and once symptoms appear the 5-year mortalityrate is approximately 50%. Symptoms of autonomic dysfunction can be extensive, and involve the stomach, intestine, bladder, heart and reproductive organs. Currently, the management of autonomic dysfunction remains primative due to our poor understanding of the mechanisms underlaying the disease. Recent work from our group has identified an excitatory autoantibody (an antibody against the self) to calcium channels in patients with type 1 diabetes. The anti-calcium channel autoantibody profoundly disrupts gut and bladder function by interfering with autonomic regulation of smooth muscle within these organs. The anti-calcium channel autoantibody is the first functional autoantibody to be detected in type 1 diabetes, and represents a conceptual advance in our understanding of immune mechanisms in this disease. Using animal models and a panel of novel, functional assays of colon, stomach and bladder we will investigate how the anti-calcium channel autoantibodies contribute to autonomic dysfunction in type 1 diabetes. Understanding the mechanisms by which this autoantibody effects autonomic regulation of organ function will enable the development of new therapeutic strategies for better management of patients.Read moreRead less
The Role Of NKT Cell Subsets In The Regulation Of EAE
Funder
National Health and Medical Research Council
Funding Amount
$455,899.00
Summary
Multiple sclerosis (MS) is the most cause of paralysis amongst young adults. Experimental autoimmune encephalomyelitis (EAE) is an animal model of MS that recapitulates many features of the human disease. NKT cells are a group of T cells, whose actiavtion protects against EAE, in an as yet unidentified manner. These studies will provide critical information on the way in which NKT cells regulate immunity and will enhance development of therapies for MS.
The Generation And Function Of Tissue-specific Regulatory T Cells
Funder
National Health and Medical Research Council
Funding Amount
$488,577.00
Summary
The immune system normally protects against invasion by pathogens such as harmful viruses and bacteria. In autoimmune diseases the same mechanisms that are used to protect us are erroneously targeted to our own tissues. We will discover how regulatory lymphocytes, are able to protect against autoimmune disease. Such regulatory lymphocytes are attractive therapeutic agents to prevent a variety of immune-mediated diseases, including autoimmune diseases, allergy and transplantation rejection.
Identifying The Underlying Mechanisms Responsible For The Generation Of Pathogenic B Cells In Type 1 Diabetes
Funder
National Health and Medical Research Council
Funding Amount
$163,755.00
Summary
Type 1 diabetes (T1D) occurs when the body's own immune system mistakenly attacks and destroys all the beta cells of the pancreas which produce insulin, a hormone essential for regulating sugar levels in the blood. The non-obese diabetic (NOD) mouse develops a form of T1D closely resembling the human disease, and as a model, has led to numerous important insights into its cause. Based on studies in NOD mice, it is now well accepted that a class of cell in the immune system, termed T cells, are r ....Type 1 diabetes (T1D) occurs when the body's own immune system mistakenly attacks and destroys all the beta cells of the pancreas which produce insulin, a hormone essential for regulating sugar levels in the blood. The non-obese diabetic (NOD) mouse develops a form of T1D closely resembling the human disease, and as a model, has led to numerous important insights into its cause. Based on studies in NOD mice, it is now well accepted that a class of cell in the immune system, termed T cells, are responsible for most of the damage to the beta cells in T1D. Recent work in this model, however, has demonstrated that another class of immune cell, termed B cells, also play an important role in T1D as NOD mice made deficient in these cells no longer develop disease. In addition to producing antibodies, B cells are one of the few cell types which are able to take up and present protein fragments in a form recognizable to T cells. Normally, this only leads to the activation of T cells recognising foreign insults, like viruses or bacteria, resulting in their destruction. We have shown that a dangerous population of B cells can arise in NOD mice that can specifically take up beta cell proteins and present them to the T cells, which subsequently become armed to recognise and destroy the beta cells. Just like T cells, B cells that recognize the body's own proteins are normally eliminated in healthy mice and human individuals. This research proposal aims to determine the faulty immune mechanisms that give rise to the beta cell specific B cells in NOD mice. We have also set out to identify the diabetes susceptibility genes which control the generation of this dangerous population of B cells in this model. By understanding how these dangerous B cells are generated in NOD mice, we hope to form the basis for new therapies aimed at inhibiting these cells from forming in T1D susceptible humans, thus preventing the disease at an early stage.Read moreRead less
Stem Cell Engineering To Establish Tolerance And Reverse Autoimmunity
Funder
National Health and Medical Research Council
Funding Amount
$497,250.00
Summary
The immune system is designed to protect us from harmful invaders such as bacteria, viruses and parasites. It should not attack our own tissues. However, in certain individuals, the immune system does attack our own tissues leading to life threatening conditions such as diabetes, multiple sclerosis and rheumatoid arthritis. To date, there is no cure for autoimmune diseases. Treatment is designed to treat the destructive effects of the disease. A strategy for achieving a cure is to program the im ....The immune system is designed to protect us from harmful invaders such as bacteria, viruses and parasites. It should not attack our own tissues. However, in certain individuals, the immune system does attack our own tissues leading to life threatening conditions such as diabetes, multiple sclerosis and rheumatoid arthritis. To date, there is no cure for autoimmune diseases. Treatment is designed to treat the destructive effects of the disease. A strategy for achieving a cure is to program the immune system to remove the harmful immune cells. Autoimmune gastritis which leads to pernicious anaemia is an autoimmune disease which affects the acid secreting cells of the stomach. To get a better understanding of autoimmune diseases, animal models are often used. We use a number of mouse models of autoimmune gastritis which closely resembles the human disease and thus makes a very good working model. Using these models we are exploring novel techniques aimed at reversing or curing established disease. This relies on removing the disease causing cells from the body and re-programming the immune system so as not to produce these cells.Read moreRead less
Genetic Control Of Susceptibility To Autoimmune Gastritis
Funder
National Health and Medical Research Council
Funding Amount
$346,945.00
Summary
Autoimmune gastritis is caused by the immune system targeting and destroying the stomach lining. We have developed a mouse model of the causes of gastritis and mapped the two major genes that can control susceptibility. This project involves the final stages of identifying these genes and determining how they cause disease.
HMGB1: A Novel Player In The Pathogenesis Of Inflammatory Myositis?
Funder
National Health and Medical Research Council
Funding Amount
$84,800.00
Summary
The project aims to determine whether HMGB1, a pro-inflammatory molecule, plays a key role in the cause of inflammatory myositis, an extremely disabling muscle condition characterised by progressive weakness.
In Vivo And In Vitro Studies Of The Human -308 TNF Promoter Polymorphism.
Funder
National Health and Medical Research Council
Funding Amount
$232,131.00
Summary
The identification of genetic variation in region of the DNA that controls expression of the inflammatory cytokine Tumour Necrosis Factor (TNF) and its association with a number of autoimmune and inflammatory diseases, has led to speculation that this genetic difference may play a role in predisposing some people to these diseases. We have isolated an activity, TPF1, that may regulate expression through interaction with this DNA control region. During the tenure of this grant we intend to clarif ....The identification of genetic variation in region of the DNA that controls expression of the inflammatory cytokine Tumour Necrosis Factor (TNF) and its association with a number of autoimmune and inflammatory diseases, has led to speculation that this genetic difference may play a role in predisposing some people to these diseases. We have isolated an activity, TPF1, that may regulate expression through interaction with this DNA control region. During the tenure of this grant we intend to clarify some of these questions, we will generate genetically modified mice that have either of the two genetic forms of the human TNF promoter. These mice will be compared in two models of associated disease, murine Lupus and cerebral malaria. We will also characterise the interactions of TPF1 with other components of the TNF control region. An understanding of the role of TPF1 in controlling TNF expression and an appreciation of the cell types that are able to express the phenotype, will allow the development of more subtle, cell specific strategies to modulate the activity of TNF without completely abolishing expression and may lead to better preventative and therapeutic strategies.Read moreRead less