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Understanding Rapid T-cell Clearance By The Liver: A Critical Step Towards Improved Liver Transplantation.
Funder
National Health and Medical Research Council
Funding Amount
$412,134.00
Summary
The liver has paradoxical properties: it is the site of effective immune responses to pathogens, but under some circumstances, it is known to induce harmless immune responses. Poor responses can be beneficial in a transplantation setting because, in the absence of immunosuppressive drugs, liver transplants are more readily accepted than other organ allografts. Not only are liver transplants well accepted, they can induce secondary acceptance of kidney or heart grafts from the same donor that wou ....The liver has paradoxical properties: it is the site of effective immune responses to pathogens, but under some circumstances, it is known to induce harmless immune responses. Poor responses can be beneficial in a transplantation setting because, in the absence of immunosuppressive drugs, liver transplants are more readily accepted than other organ allografts. Not only are liver transplants well accepted, they can induce secondary acceptance of kidney or heart grafts from the same donor that would otherwise be rejected. However, this ability of the liver to induce unresponsiveness may allow some viruses to persist, particularly , Hepatitis B and C. Four in every five patients infected with hepatitis C develop a chronic disease due to the inability of the immune system to clear the virus. Although it is known that white blood cells enter the liver and become unresponsive, little is known about the mechanisms that prevent an effective response. The CIA s work has been at the forefront of liver immunology and transplantation by demonstrating that the architecture and vasculature of the liver, and therefore the type of unique cellular interactions taking place within it, are essential to gain an understanding of its unique immunological properties. Using the CIB s unique protocols for solid-organ transplantation in rodents, we will provide evidence for a new mechanism that occurs at very early stages after antigen encounter in the liver. We propose to unravel this mechanism using well characterised transgenic mouse models and advanced analytical technology. We will determine the role of this mechanism in liver transplantation. Our preliminary data point to a very high chance of success. This project will have important implications for transplantation studies and for the development and treatment of food allergies and chronic hepatitis C and other of immune-mediated liver diseases.Read moreRead less
The Regulation Of Monocyte Derived Dendritic Cells (moDCs) During Allograft Rejection
Funder
National Health and Medical Research Council
Funding Amount
$110,218.00
Summary
Islet transplantation can cure type 1 diabetes, but the required drugs for immunosuppressing graft rejection have side effects. Therefore understanding how immune rejection occurs so that we can suppress in a more discreet selective way is our goal. A type of cell that is prominent during graft rejection is the monocyte derived dendritic cell. We propose that this cell is critical for orchestrating immune responses during rejection. Therefore we wish to determine how such cells are controlled.
Dendritic Cell-mediated Induction Of T Cell Tolerance
Funder
National Health and Medical Research Council
Funding Amount
$654,725.00
Summary
Australia has some of the highest rates of immune-mediated diseases in the world. These diseases include autoimmune, allergic and inflammatory conditions. We will use a mouse model to study how dendritic cells can prevent the onset of these conditions by inactivating the immune cells that cause them. Our findings will aid in understanding why these diseases develop and how they may be prevented and treated.
Upregulation Of Chemokine Receptor Expression And Function On CD4+ T Cells In Primary And Secondary Immune Responses
Funder
National Health and Medical Research Council
Funding Amount
$469,500.00
Summary
This research will begin to determine the significance of changes in the amount of recently-discovered proteins on the surface of cells called T lymphocytes. These cells control immune responses and move throughout the body to do this. Sometimes, they are activated inappropriately and cause diseases like asthma, arthritis and multiple sclerosis and other times they need assistance for activation (vaccination). It is therfore important to understand how the movement of these cells through the bod ....This research will begin to determine the significance of changes in the amount of recently-discovered proteins on the surface of cells called T lymphocytes. These cells control immune responses and move throughout the body to do this. Sometimes, they are activated inappropriately and cause diseases like asthma, arthritis and multiple sclerosis and other times they need assistance for activation (vaccination). It is therfore important to understand how the movement of these cells through the body is controlled. A better understanding of this process shuld allow us to design better ways to control it, thereby controlling the negative aspects of T lymphocyte activation.Read moreRead less
Mechanisms Of Rapid Memory CD8+ T-cell Inactivation
Funder
National Health and Medical Research Council
Funding Amount
$318,517.00
Summary
Type 1 diabetes (T1D) and other autoimmune diseases results from misdirected immune responses that destroy normal body tissues. The ultimate goal of therapeutic strategies is to remove or inactivate the immune cells that attack normal tissues, while leaving other immune cells, for example, those required for protection from infectious diseases and tumours, unaffected. Here we propose to test a new way of turning off inappropriate immune reactions.
The Molecular Identification Of FoxP3 +ve Regulatory T Cells
Funder
National Health and Medical Research Council
Funding Amount
$483,273.00
Summary
The immune system has a series of checks and balances in place to distinguish foreign bodies from normal, or self-antigens. In healthy individuals this prevents the immune system from attacking the cells and tissues of the body, food proteins, and the beneficial bacteria of the gut. However in autoimmune disease the system becomes imbalanced, allowing reactions to benign antigens, causing diseases such as diabetes, asthma and rheumatoid arthritis. One of the key players in the maintenance of a h ....The immune system has a series of checks and balances in place to distinguish foreign bodies from normal, or self-antigens. In healthy individuals this prevents the immune system from attacking the cells and tissues of the body, food proteins, and the beneficial bacteria of the gut. However in autoimmune disease the system becomes imbalanced, allowing reactions to benign antigens, causing diseases such as diabetes, asthma and rheumatoid arthritis. One of the key players in the maintenance of a healthy immune system is a specialized set of T cells known as T Regulatory cells. These cells are rare, at 1-4% of all T cells, yet are potent modulators of other T cells, and can prevent the activation of a T cell if it is reacting to a self-antigen. If they can control the cause of autoimmune disease, and patient Treg cells can be manipulated, it may be possible to use them therapeutically. Recently the switch that is required to generate regulatory cells was identified from patients with a rare autoimmune disease called Immunodysregulation, polyendocrynopathy, enteropathy, X-linked syndrome or IPEX. A mouse disease, Scurfy, with similar symptoms, is caused by the same mutations. The mutated gene encodes a protein, FoxP3, and this protein is able to bind to other genes in T cells and regulate their function. Without this protein, there are no T regulatory cells, resulting in autoimmune disorders. At this time there is very little known about how the FoxP3 gene is able to make a T cell become a regulatory T cell, and nothing is known about the genes that are turned off and on to facilitate this. If we can understand better the role of this protein, FoxP3, in the generation and maintenance of T cells with regulatory function, we may better be able to diagnose and treat autoimmune diseases, and this knowledge will have broad application to many autoimmune disorders.Read moreRead less
Mechanisms Of Dendritic Cell-induced T-cell Tolerance
Funder
National Health and Medical Research Council
Funding Amount
$314,773.00
Summary
Autoimmune diseases constitute a significant medical problem in the developed world and are increasing in incidence. Many control mechanisms exist in the body, but in people with genetic suceptibility to autoimmune disease, the mechanisms fail and the body's immune sytem attacks normal tissues or organs. We have developed a new approach to using the cells which train the immune system to re-educate the cells that would otherwise attack normal healthy tissues in autoimmune-prone individuals. Thes ....Autoimmune diseases constitute a significant medical problem in the developed world and are increasing in incidence. Many control mechanisms exist in the body, but in people with genetic suceptibility to autoimmune disease, the mechanisms fail and the body's immune sytem attacks normal tissues or organs. We have developed a new approach to using the cells which train the immune system to re-educate the cells that would otherwise attack normal healthy tissues in autoimmune-prone individuals. These cells (dendritic cells) are genetically modified to express the molecular targets of the autoimmune response. This in turn switches off the response to these targets. In this project we will explore how these cells can be used to turn off cells of the immune system and if cells of the immune system in turn control the dendritic cell's ability to do this.Read moreRead less