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Investigation Of The Roles Of TNFa-related Apoptosis-inducing Ligand, TRAIL, In The Immune System.
Funder
National Health and Medical Research Council
Funding Amount
$436,980.00
Summary
TRAIL, is a newly described member of the tumour necrosis factor (TNF)-family of cytokines, which can kill a wide range of tumour cells, and virus infected cells, but not most normal cells. TRAIL has proven to be safe when administered to normal, tumour bearing, and virally-infected mice, and causes no detectable side-effects in these animals. As such it holds huge potential and is being widely investigated for use as a new anti-cancer therapy. Despite these findings, little is known about the t ....TRAIL, is a newly described member of the tumour necrosis factor (TNF)-family of cytokines, which can kill a wide range of tumour cells, and virus infected cells, but not most normal cells. TRAIL has proven to be safe when administered to normal, tumour bearing, and virally-infected mice, and causes no detectable side-effects in these animals. As such it holds huge potential and is being widely investigated for use as a new anti-cancer therapy. Despite these findings, little is known about the true physiological role of TRAIL in vivo. To define the normal roles of TRAIL, CIA has been characterising TRAIL gene knock-out mice. These studies have confirmed that TRAIL contributes to control of tumours in vivo, and in early events during anti-viral responses. However, these studies have also revealed novel roles for TRAIL in T cell biology, and B cell memory. Understanding how TRAIL contributes to these processes, will shed significant light on the potential of TRAIL to be used as a therapeutic agent for humans with lymphoproliferative disease, for illiciting better long-lived antibody responses such as after vaccination, and as an anti-viral reagent in immunocompromised individuals during virus infection.Read moreRead less
Mechanisms Regulating The Shutdown Of Cytotoxic T Cell Populations In Acute And Persistent Viral Infections
Funder
National Health and Medical Research Council
Funding Amount
$386,120.00
Summary
Apoptosis, or programmed cell death, is the form of cell death responsible for removal of unwanted or excess cells from the body. This is an essential mechanism to allow remodelling of tissues as an embryo grows and is a crucial way in which the body prevents the unwanted outgrowth of individual cell types. Control of cell growth in this way is a key checkpoint in preventing cancers. This regulatory mechanism is also important in determining the number and type of immune cells that are generated ....Apoptosis, or programmed cell death, is the form of cell death responsible for removal of unwanted or excess cells from the body. This is an essential mechanism to allow remodelling of tissues as an embryo grows and is a crucial way in which the body prevents the unwanted outgrowth of individual cell types. Control of cell growth in this way is a key checkpoint in preventing cancers. This regulatory mechanism is also important in determining the number and type of immune cells that are generated at steady state and following an immune response. Two families of proteins are essential in initiating this process of apoptosis. One is known as the BH-3-only family, while the other is the tumour-necrosis receptor (TNFR) family. These families are made up of several family members, each of which responds to different types of stimuli, and are expressed in different tissues in the body. So far only one BH-3-only family member, BIM, has been identified to regulate shut-down of an immune response. This action prevents the generation of large numbers of highly aggressive cells that are specific for a pathogen inadvertently causing damage to the body. This control checkpoint is a normal, but vital, part of the immune response. Other members of these families are also likely to play an important role in this process, but as yet their identity is unknown. This study will determine which members of the BH-3-only and TNFR family members play a role in (i) regulating the numbers of lymphocytes present at steady state, and (ii) in the shut-down process in different types of pathogen infection. This work will provide insight into how lymphocytes are regulated in the resting animal, and in disease.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.
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 Causes, Treatment, And Prognosis Of Thyroid Disease
Funder
National Health and Medical Research Council
Funding Amount
$190,445.00
Summary
The thyroid gland controls body metabolism and is crucial to life. Disorders of the thyroid place a severe burden on the health system. Yet despite this, much is unknown about the causes, optimal treatments, and prognosis of thyroid disease. In this NHMRC Early Career Fellowship, Don aims to advance knowledge and improve treatments of these common conditions, focusing on thyroid cancer, Graves’ disease, and Hashimoto’s thyroiditis.
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 Influence Of NF-KB In The Development Of Autoimmunity And Cancer In Fas/FasL Mutant Mice
Funder
National Health and Medical Research Council
Funding Amount
$596,925.00
Summary
Apoptotic cell death is an essential process in the human body, it removes useless and dangerous cells, preventing autoimmune disease and cancer. Apoptosis is activated when the surface receptor Fas is stimulated by its ligand, FasL, but defective signalling causes disease associated with deregulated NF-?B activation. We will investigate how faulty FasL-induced apoptosis cooperates with deregulated NF-kB activation or defective Aire (immunological tolerance orchestrator) results in autoimmunity.
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