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The Molecular Basis To The Development And Function Of The Thymic Microenvironment.
Funder
National Health and Medical Research Council
Funding Amount
$227,036.00
Summary
The ability of the body to defend itself against infection is dependent on white cells in the blood called T lymphocytes, so-named because they are produced in the thymus gland. In the absence of these T cells, there is severe immunodeficiency. On other hand if the T cells are hyperactive, they can confuse their role and destroy normal tissues (autoimmunity). Imbalances in the types of T cells can also predispose patients to allergies and failures in responses to tumours. This project seeks to i ....The ability of the body to defend itself against infection is dependent on white cells in the blood called T lymphocytes, so-named because they are produced in the thymus gland. In the absence of these T cells, there is severe immunodeficiency. On other hand if the T cells are hyperactive, they can confuse their role and destroy normal tissues (autoimmunity). Imbalances in the types of T cells can also predispose patients to allergies and failures in responses to tumours. This project seeks to identify the genes required to create T cells in the thymus. Specifically it addresses the structural cells of the thymus which provide the unique environment for converting bone marrow precursors exclusively into T lymphocytes. Understanding the genetic and thus molecular basis to this will be very important biologically but may also provide more sophisticated stratgies for treating diseases on T cell origin.Read moreRead less
The Generation, Fate And Functional Potential Of Recent Thymic Emigrants
Funder
National Health and Medical Research Council
Funding Amount
$318,856.00
Summary
A particular kind of white blood cell, called a T lymphocyte, is responsible for controlling our immune responses to foreign invaders. These cells develop in the thymus, where they learn to distinguish between foreign invaders and self tissue, before emigrating to other organs. The regulation of this process is important to maintain a pool of T lymphocytes in the body. It is important that T lymphocytes do not respond against self tissue, as this can lead to a Oself destructO disease called auto ....A particular kind of white blood cell, called a T lymphocyte, is responsible for controlling our immune responses to foreign invaders. These cells develop in the thymus, where they learn to distinguish between foreign invaders and self tissue, before emigrating to other organs. The regulation of this process is important to maintain a pool of T lymphocytes in the body. It is important that T lymphocytes do not respond against self tissue, as this can lead to a Oself destructO disease called autoimmunity. Since these developing T lymphocytes will not see all kinds of self tissue while in the thymus, we propose that their education to prevent self-tissue reactivity may continue for some time after they leave the thymus.Read moreRead less
The Regulation And Differentiation Potential Of Human Memory B Lymphocytes
Funder
National Health and Medical Research Council
Funding Amount
$227,036.00
Summary
Antibody produced by our immune system plays a critical role in protecting us from infectious disease. Remarkably our ability to make antibodies is much faster the second time we see the infection. This memory of the previous attack occurs due to the formation of memory B cells that circulate in the blood, sometimes for years, looking for the same intruders. If they detect the infection they rapidly become activated and remake the antibody. These memory cells are very important for our protectio ....Antibody produced by our immune system plays a critical role in protecting us from infectious disease. Remarkably our ability to make antibodies is much faster the second time we see the infection. This memory of the previous attack occurs due to the formation of memory B cells that circulate in the blood, sometimes for years, looking for the same intruders. If they detect the infection they rapidly become activated and remake the antibody. These memory cells are very important for our protection. Vaccines operate by tricking the immune system into making these memory cells, even though the body hasn't seen the actual disease. Although clearly vital for our health little is known about the activation and antibody production by human B memory cells. This project will redress our lack of knowledge by performing a comprehensive evaluation of the properties of this important cell type.Read moreRead less
The Quantitative Regulation Of Antibody Forming Cell Differentiation
Funder
National Health and Medical Research Council
Funding Amount
$336,500.00
Summary
B lymphocytes are the antibody-producing cells of the immune system. After they are made in the bone marrow, they are exported to the body to circulate, searching for signs of infection. When they encounter an invader, they change, with the help of other immune cells, into antibody-producing cells. A small proportion of the cells are set aside as memory cells that can rapidly become antibody-producing cells should the same infection occur again in the future. This is the basis of vaccination. Th ....B lymphocytes are the antibody-producing cells of the immune system. After they are made in the bone marrow, they are exported to the body to circulate, searching for signs of infection. When they encounter an invader, they change, with the help of other immune cells, into antibody-producing cells. A small proportion of the cells are set aside as memory cells that can rapidly become antibody-producing cells should the same infection occur again in the future. This is the basis of vaccination. The secretion into serum of antibodies that can bind to and eliminate an invader anywhere in the body is the main function of B lymphocytes. This project studies how a B cell changes into an antibody-producing cell. We will learn very basic and detailed quantitative aspects of the process, such as: -How long does it take to become an antibody-producer once a B cell detects an invader? -Do they-must they divide while they are changing? -How do hormones from other cells regulate the process? Do they increase division, survival, change the properties of the B cells, or improve their output? We will study all these responses in detail, so that we can make a model that can accurately predict the outcome of a particular set of circumstances. We will study the genes that are known to be required for antibody-producing cells to form, or to do their work. We will also study animals whose immune systems are under- or over-active, to find out what part of the antibody-producing process is faulty. We may be able to predict where the problem lies, by comparing these animals cells to our model, and therefore to suggest a remedy. Using this information, we hope eventually to be able to study diseases of antibody producing cells in humans (as occur in allergy, asthma, rheumatoid arthritis and leukaemia), to be able to identify the precise cause of the problem, and to suggest a therapy. This information may also be used to improve the outcome of vaccination.Read moreRead less
Modulation Of HIV-1 Latency In Primary CD4 T Cells By Chemokines And Dendritic Cells
Funder
National Health and Medical Research Council
Funding Amount
$380,167.00
Summary
Although treatment of HIV using antiretroviral drugs has dramatically improved outcome the presence of latent infection in long lived T cells has so far prevented cure of HIV infection. This study examines the roles of chemokines (proteins that control cell migration) and a special type of infection fighting cell, the dendritic cell, in generating latent infection in resting T cells. These studies could potentially identify new ways to treat and potentially cure HIV infection.