Induction Of Reactive Oxygen Species By Hepatitis C Virus And Its Role In Liver Pathogenesis.
Funder
National Health and Medical Research Council
Funding Amount
$376,320.00
Summary
The majority of individuals infected with hepatitis C virus (HCV) show a slow progression of liver disease over a period of 20-30 years. There is increased scaring of the liver which can result in liver failure and in some individuals liver cancer. Due to the lack of suitable model systems to study HCV infection and disease progression there is no currently available vaccine and treatment options are limited. While the host defense mechanisms to HCV are relatively well studied the role that vira ....The majority of individuals infected with hepatitis C virus (HCV) show a slow progression of liver disease over a period of 20-30 years. There is increased scaring of the liver which can result in liver failure and in some individuals liver cancer. Due to the lack of suitable model systems to study HCV infection and disease progression there is no currently available vaccine and treatment options are limited. While the host defense mechanisms to HCV are relatively well studied the role that viral proteins and viral replication play in the development of liver disease are not well characterized. Previous experiments in the laboratory have shown that one of the hepatitis C virus proteins results in the formation of toxic oxygen molecules known as a reactive oxygen species. This toxic oxygen molecules can have an effect on liver cells that may enhance the progression of the liver disease process in hepatitis C virus infected individuals. The role that these molecules play in liver cells is unknown but experiments are planned in laboratory model systems and in specimens obtained from hepatitis C virus infected individuals to further examine potential mechanisms. This will hopefully lead to the identification of new treatments for hepatitis C virus liver disease. Some patients with hepatitis C will develop liver cancer, however, all the reasons are not known. Using new technology known as microarray, a consequence of the human genome project, we have been able to look at the expression levels of thousands of genes in liver cancer. Experiments are planned to determine if these genes are important in liver cancer and if they can be used as targets for therapy or to more easily diagnose liver cancer.Read moreRead less
Diet As A Therapeutic Target In Depression: A Randomised Controlled Trial
Funder
National Health and Medical Research Council
Funding Amount
$498,564.00
Summary
Depression is predicted to become the second-most common cause of disability in the world by 2020. While there is now compelling new evidence to suggest that diet plays an important role in the risk for and the genesis of depression, there are no existing data regarding the impact of dietary improvement on existing depressive illness. The aim of the proposed study is to answer the critically important and frequently asked question "If I improve my diet, will my mental health improve?"
The Role Of Interleukin-21 In The Pathogenesis Of Autoimmune Diabetes
Funder
National Health and Medical Research Council
Funding Amount
$519,000.00
Summary
T cells are a component of our blood (white blood cells) and a major component of the body's defense system against infection, known as immunity. Without T cells, we would fail to resist infection by foreign agents, such as viruses, bacteria and fungi. Autoimmune (type 1) diabetes is a disease in which T cells attack our own pancreatic islet self tissues as if they were foreign. T cells that react against the islets of the pancreas cause destruction of the insulin producing beta cells so that th ....T cells are a component of our blood (white blood cells) and a major component of the body's defense system against infection, known as immunity. Without T cells, we would fail to resist infection by foreign agents, such as viruses, bacteria and fungi. Autoimmune (type 1) diabetes is a disease in which T cells attack our own pancreatic islet self tissues as if they were foreign. T cells that react against the islets of the pancreas cause destruction of the insulin producing beta cells so that the pancreas can no longer make insulin. Diabetes is a life-threatening disease because insulin is a hormone that enables people to get energy from food. Type 1 diabetes is usually diagnosed in childhood and insulin must be administered daily by injection or through a pump in order to survive. Unfortunately, taking insulin doesn t cure diabetes and people continue to suffer from an extensive list of complications affecting most vital organs. Interleukin-21 (IL-21) is a soluble protein that is produced by cells enabling them to communicate with other cells. IL-21 helps cells to produce factors that cause inflammation and assist in clearance of viruses and bacteria from the body. However, our studies show that IL-21 is a major factor in the development of the T cells that destroy beta cells and cause diabetes. Our studies show that IL-21 is over-expressed in an important murine model of spontaneous type-1 diabetes. We have isolated the T cells that cause diabetes and show that they are distinguished from other T cells by very high levels of the receptor for IL-21. This project focuses on the IL-21-responsive T cells that cause diabetes and aims to determine the mechanisms by which the cytokine IL-21 causes destructive immune responses and ways to modulate its production. This project applies basic science to the important public health issue of type 1 diabetes for the development of therapeutic intervention strategies.Read moreRead less
The Role Of Interleukin-21 In The Pathogenesis Of Autoimmune Diabetes
Funder
National Health and Medical Research Council
Funding Amount
$489,060.00
Summary
Interleukin-21 (IL-21) is a soluble protein that is produced by cells enabling them to communicate with other cells. IL-21 helps cells to clear viruses and bacteria from the body. However, our studies show that IL-21 also generates T cells that destroy beta cells and cause diabetes. IL-21 is produced at abnormally high levels in an important murine model of spontaneous type-1 diabetes (T1D) and if we block IL-21 we prevent diabetes. This projects' aims assess IL-21 as therapeutic target for T1D.
Overcoming Breast Cancer Heterogeneity And Resistance Using A Novel Therapeutic Approach Targeting The Metastasis Suppressor NDRG1.
Funder
National Health and Medical Research Council
Funding Amount
$431,000.00
Summary
Breast cancer (BrCa) is the leading cause of cancer death in women and current treatments suffer from development of resistance, leading to metastatic progression. I will assess a novel treatment strategy for BrCa, targeting a gene that is able to inhibit multiple key drivers of BrCa, using a novel potent and selective anti-cancer agent. This approach has the potential to overcome resistance to current therapies and alleviate the onset of metastasis, to improve prognosis for BrCa patients.
Osteoclasts (OC) are large multinucleated cells present in bone that are responsible for bone resorption. The renewal of bone and bone growth are regulated by the opposing actions of OCs and osteoblasts, cells that form new bone. Together, with other accessory cells in the bone marrow, these constitute 'bone-forming units' (BFU). Excess production or over-activation of OCs in the BFU leads to common bone conditions such as osteoporosis, Paget's disease and the bone lysis caused by bone cancers. ....Osteoclasts (OC) are large multinucleated cells present in bone that are responsible for bone resorption. The renewal of bone and bone growth are regulated by the opposing actions of OCs and osteoblasts, cells that form new bone. Together, with other accessory cells in the bone marrow, these constitute 'bone-forming units' (BFU). Excess production or over-activation of OCs in the BFU leads to common bone conditions such as osteoporosis, Paget's disease and the bone lysis caused by bone cancers. Osteoporosis causes a great deal of pain and disability and it alone costs the Australian taxpayers more than $400 million per year. OCs are formed from white blood cells that are present in the bone marrow and the blood. The recent discovery of a family of new factors that control the formation of OCs has enabled the generation of human OCs in the laboratory so now we can investigate the genes that control the process of conversion of white blood cells to OCs. An important advance in this project involves the use of cord blood that contains stem cells. These very na ve cells will enable us to study the very earliest genes that control differentiation of precursors to OC. We have found a number of genes that are regulated by these new bone-forming factors. In white blood cells the activation of particular genes can regulate OC formation. One example is vitamin D-upregulated gene, VDUP. This gene is of particular interest as it causes inhibition of the mechanism that leads to OC formation in the bone. Obviously, the ability to control a 'switch' that regulates OC formation may enable us to control the progress of bone loss in diseases such as osteoporosis. In this project, we intend to investigate how and why the genes that lead to OC formation are regulated and what influence the various bone cell factors have on the formation of bone-resorbing OCs. These studies will lead to the development of treatments for osteoporosis and other bone diseases.Read moreRead less
TACI: A Novel Immune Checkpoint In Chronic Lymphocytic Leukemia
Funder
National Health and Medical Research Council
Funding Amount
$874,462.00
Summary
Chronic Lymphocytic Leukemia (CLL) is a very common blood cancer. CLL cells actively shut down immune defenses in patients. Moreover, current as well as emerging more targeted therapies suppress immunity and over a quarter of patients will die from an infection despite a good response to cancer treatments. Our laboratory has gained new understanding in the mechanism of action of a new treatment for CLL called Ibrutinib. This information allows us to design improved treatment options for CLL.
Relaxin Receptor Structural Determination To Aid Therapeutic Development
Funder
National Health and Medical Research Council
Funding Amount
$1,249,114.00
Summary
The receptor for the peptide hormone relaxin, RXFP1, is being targeted by numerous drug companies for the treatment of cardiovascular disease. However, the lack of molecular detail of how relaxin binds and activates RXFP1 is hindering new drug development. We will determine the structure of the complex of relaxin bound to RXFP1 and the mechanism by which this activates cells. The knowledge gained will aid in the design of new drugs targeting RXFP1 for the treatment of cardiovascular disease.