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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.
Investigations In Multiple Sclerosis Patients With Coexistent Autoimmune Thyroid Disease
Funder
National Health and Medical Research Council
Funding Amount
$557,100.00
Summary
Multiple sclerosis (MS) is a common chronic neurological disease affecting over one million people around the world. MS is generally thought to be an autoimmune disease, in which a person's own immune cells start to attack components of the brain and spinal cord. However, it is thought that the same components are not attacked in all patients, and that the pathway that leads to MS varies from one person to another. Therefore, in order to develop successful treatment strategies for MS, it will be ....Multiple sclerosis (MS) is a common chronic neurological disease affecting over one million people around the world. MS is generally thought to be an autoimmune disease, in which a person's own immune cells start to attack components of the brain and spinal cord. However, it is thought that the same components are not attacked in all patients, and that the pathway that leads to MS varies from one person to another. Therefore, in order to develop successful treatment strategies for MS, it will be necessary to look for patterns in the clinical symptoms and signs and other features of a person's MS that may give clues as to which particular pathway is leading to disease in that person. Some people who develop MS also develop other autoimmune diseases, or have these other diseases before they develop MS, or have other family members who have other autoimmune diseases. We have recently found that people who have the same combination of coexistent MS and autoimmune thyroid disease (AITD) show similar clinical signs of MS, and tend to have damage (lesions) to the same areas of their nervous system. This suggests that these people may have the same underlying pathways leading to the development of MS, and that they may be a very informative group in which to look for immune or genetic abnormalities that might explain why they develop MS. This project will investigate people who have both MS and AITD and other members of their families to see if we can work out what the links are between having the same combination of autoimmune diseases and developing lesions in particular parts of the nervous system. It will provide information on the pathways that lead to the development of MS, and information obtained from this study may eventually be of use in developing more specific therapeutic agents, by tailoring therapies to specific people with MS, depending on the clinical and immunological profile of that person.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
Organ-specific Autoimmunity: The Role Of The Thymus And Periphery In Shaping The Gastric-specific T Cell Repertoire
Funder
National Health and Medical Research Council
Funding Amount
$579,763.00
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. White blood cells, called T lymphocytes are responsible for attacking our own tissues in autoimmune diseases. Our studies will employ a range of molecular, genetic and imaging technologies to track the rare and potential harmful white blood cells. Our studies should reveal the me ....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. White blood cells, called T lymphocytes are responsible for attacking our own tissues in autoimmune diseases. Our studies will employ a range of molecular, genetic and imaging technologies to track the rare and potential harmful white blood cells. Our studies should reveal the mechanisms by which these self destructive T lymphocytes are silenced in healthy individuals on the one hand, and on the other hand escape to cause destruction in individuals with autoimmune diseases. This fundamental information will allow the development of therapeutic strategies to selectively turn-off these destructive T lymphoctyes in individuals with autoimmune disease and thereby remove the damaging immune response and cure the disease.Read moreRead less
Immunopathogenesis Of Organ-specific Autoimmune Disease
Funder
National Health and Medical Research Council
Funding Amount
$284,638.00
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. Our studies will employ state-of-the art technologies to further our knowledge of this class of diseases and to uncover the normal mechanisms that allow the immune system to differentiate foreign and self components.
Autoimmune diseases are those caused by the body's immune system attacking the body's own tissues. One group of autoimmune diseases, termed the thyrogastric cluster appear to share genetic risk factors, because they tend to occur together - either in the same patient, or else in families. Some of the diseases within the thyrogastric cluster are known to be very complex genetically, while others appear to be much less complex. Furthermore, some animal models of autoimmune diease are genetically s ....Autoimmune diseases are those caused by the body's immune system attacking the body's own tissues. One group of autoimmune diseases, termed the thyrogastric cluster appear to share genetic risk factors, because they tend to occur together - either in the same patient, or else in families. Some of the diseases within the thyrogastric cluster are known to be very complex genetically, while others appear to be much less complex. Furthermore, some animal models of autoimmune diease are genetically simpler still. We have chosen to study the genetics of gastritis in mice that have had their thymuses removed on the third day of life, because this model has relatively few genes involved; we have found that only 4 genes affect the risk of disease. This means that it will give us the optimum chance of identfiying at least one of these genes. The methods used involve both selective breeding techniques and generating special gene transfer mice in which individuals from one strain will carry the inserted genes from another. In this way, we can identify exactly which genes affect the risk of disease. Once identified, the gene sequences will help us determine if the same gene plays a role in human disease, and if so, to develop new diagnostic tests and therapies.Read moreRead less
Mechanisms Of Autoantibody Mediated Axonal Injury In Inflammatory Demyelinating Neuropathies
Funder
National Health and Medical Research Council
Funding Amount
$580,197.00
Summary
Destruction of nerve fibres (axons) accompanies demyelination and may be responsible for most of the deficit in multiple sclerosis and immune neuropathies. This project will investigate the role of recently described antibodies against a normal component of the axon in axonal damage in both animal models and in patients with immune neuropathies. The project could have a major effect on approaches to management of these diseases.
CD4 T Cell-mediated Tolerance And Autoimmunity To The Gastric H/K ATPase In Genetically Manipulated Mice
Funder
National Health and Medical Research Council
Funding Amount
$295,780.00
Summary
The immune system is designed to protect us from foreign pathogens such as bacteria and viruses. However, the system is not prefect and sometimes attacks an individual's own tissue (termed autoimmunity). Autoimmunity is not uncommon in the population, including diseases such as diabetes, rheumatoid arthritis and pernicious anaemia, to name a few. To study the details associated with why and how the immune system can turn on the host, we use animal models which mimic the human diseases. The model ....The immune system is designed to protect us from foreign pathogens such as bacteria and viruses. However, the system is not prefect and sometimes attacks an individual's own tissue (termed autoimmunity). Autoimmunity is not uncommon in the population, including diseases such as diabetes, rheumatoid arthritis and pernicious anaemia, to name a few. To study the details associated with why and how the immune system can turn on the host, we use animal models which mimic the human diseases. The model we use is a mouse model for autoimmune gastritis which is an organ-specific autoimmune disorder of the stomach. People with autoimmune gastritis produce a specific autoimmune response directed at the acid secreting cells of the stomach call parietal cells. Parietal cells also produced a substance called intrinsic factor which is needed for the absorption of vitamin B12 from the diet. The lack of vitamin B12 uptake results in abnormal red blood cell formation and anaemia; hence the term pernicious anaemia. One of the unanswered questions associated with the immune system is what regulates the whole system so that it does not induce autoimmunity in everyone. The mechanisms which control or prevent autoimmunity is the subject of much debate. There is good evidence that regulation of the immune system is performed by specific suppression by regulatory cells. Many important question about these cells remain unanswered. For example, it is not known how these cells are generated or how they prevent the autoreactive cells from performing their harmful behaviour. Using our animal model for autoimmune gastritis, we are addressing some of the questions which surround the events which induce and protect us from autoimmunity. By using mice in which most of the lymphocytes in the circulation are of the same specificity (TCR-transgenic), we can follow the fate of those cells and look for cells with different characteristics; such as the ability to supress an immune response.Read moreRead less