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MODULATING MIC-1 CYTOKINE BIOAVAILABILITY: IMPACT ON TUMOUR BIOLOGY
Funder
National Health and Medical Research Council
Funding Amount
$341,210.00
Summary
MIC-1 cytokine is secreted by many tumour cells. It is commonly secreted as an inactive precursor form of MIC-1 which binds to the extracellular matrix surrounding cells, via its propeptide. This creates latent stores of cytokine which can be released and activated under specific conditions. The propeptide controls the balance between latent stores of inactive MIC-1 precursor and soluble forms of mature bioactive cytokine, which can act on surrounding cells or move into the circulation. The sign ....MIC-1 cytokine is secreted by many tumour cells. It is commonly secreted as an inactive precursor form of MIC-1 which binds to the extracellular matrix surrounding cells, via its propeptide. This creates latent stores of cytokine which can be released and activated under specific conditions. The propeptide controls the balance between latent stores of inactive MIC-1 precursor and soluble forms of mature bioactive cytokine, which can act on surrounding cells or move into the circulation. The significance of these latent stores is underscored by the finding that the level of these stores correlates with prostate cancer outcome, and also that very high circulating levels of active MIC-1 cytokine in the blood, leads to the massive weight loss characteristic of a syndrome called cancer cachexia. This is common in late stages of cancer and is a major contributing factor to the death of cancer patients. Understanding the mechanisms by which latent MIC-1 stromal stores are created and regulated, as well as their role in tumourigenesis, will have major impact on our understanding of the role of this cytokine in cancer. This is essential in order to adequately harness that knowledge for the benefit of patients.Read moreRead less
Deregulation Of Ribosome Signalling, Synthesis And Function During Malignant Transformation.
Funder
National Health and Medical Research Council
Funding Amount
$522,773.00
Summary
A major feature of tumour progression is accelerated cell growth and protein synthesis. Moreover, increased synthesis of ribosomes (the protein synthetic machinery) is associated with malignancy suggesting that it may play a causal role in cancer formation. In support of this, specific inhibitors of both ribosome biogenesis and function are extremely effective in inhibiting the growth of some tumours. This study will examine the mechanisms of deregulation of ribosome biogenesis and function duri ....A major feature of tumour progression is accelerated cell growth and protein synthesis. Moreover, increased synthesis of ribosomes (the protein synthetic machinery) is associated with malignancy suggesting that it may play a causal role in cancer formation. In support of this, specific inhibitors of both ribosome biogenesis and function are extremely effective in inhibiting the growth of some tumours. This study will examine the mechanisms of deregulation of ribosome biogenesis and function during cancer formation and assess for the first time whether aberrant regulation of ribosome biogenesis and function directly contributes to the initiation and-or progression of cancer.Read moreRead less
Therapeutic Strategies In Epithelial Cancer Through Signalling Inhibition Of The Epidermal Growth Factor Receptor.
Funder
National Health and Medical Research Council
Funding Amount
$136,250.00
Summary
The growth of cancer cells is regulated by many factors, including the presence of growth receptors on the surface of cancer cells. The epidermal growth factor receptor (EGFR) is present in some normal tissues, but is highly expressed on many common cancers, including brain, breast, lung, head and neck, colon and prostate cancer. We are developing a number of potential therapeutic compounds that act by inhibiting the EGFR in cancer cells. These compounds include a novel monoclonal antibody that ....The growth of cancer cells is regulated by many factors, including the presence of growth receptors on the surface of cancer cells. The epidermal growth factor receptor (EGFR) is present in some normal tissues, but is highly expressed on many common cancers, including brain, breast, lung, head and neck, colon and prostate cancer. We are developing a number of potential therapeutic compounds that act by inhibiting the EGFR in cancer cells. These compounds include a novel monoclonal antibody that binds to EGFR and inhibits its function, and a small molecule that binds to a portion of the EGFR inside cancer cells and also inhibits function. Both of these compounds prevent tumour growth in laboratory studies. This project will examine the mechanisms of action of these compounds, and explore ways to improve their anti-cancer effect. We have also shown that combining these compounds with other therapeutics eg chemotherapy markedly enhances their anti-cancer effect. We will further examine the mechanisms of these effects, and also determine if radiotherapy has additive anti-cancer effects. These studies will provide a basis for improved therapies for cancers overexpressing the EGFR.Read moreRead less
Plasminogen activator inhibitor type 2 (PAI-2) or SerpinB2 is a protein that has been extensively studied in the field of cancer prognosis and inflammation. Although it is widely believed that this protein exists outside the cell and inhibits enzymes involved in blood clotting and cell migration, it is becoming increasingly clear that this may not be its primary function. We have identified two important new functions for this protein that are related to activities within the cell. These activit ....Plasminogen activator inhibitor type 2 (PAI-2) or SerpinB2 is a protein that has been extensively studied in the field of cancer prognosis and inflammation. Although it is widely believed that this protein exists outside the cell and inhibits enzymes involved in blood clotting and cell migration, it is becoming increasingly clear that this may not be its primary function. We have identified two important new functions for this protein that are related to activities within the cell. These activities involve regulation of cellular growth and resistence to viral infections. This grant seeks to characterise these different activities and determine how they affect cell behaviour and thereby determine the real role of this protein. Understanding what this protein actually does will have implications for understanding cancer prognosis and antiviral resistance.Read moreRead less
Cancers have been found to contain 'stem cells' which are responsible for tumours growing and spreading throughout the body. Cancer therapies often target the cancer, but it is now clear the these treatments will only be effective if they can eradicate the malignant stem cells. This research investigates the best way of 'targeting' cancer stem cells in malignant melanoma as a means of developing more effective anti-cancer treatments.
Immunological Mechanisms Of Clinical Responsiveness To Immunotherapy For Metastatic Melanoma
Funder
National Health and Medical Research Council
Funding Amount
$480,750.00
Summary
There have been no major improvements in the treatment of most metastasizing, solid tumours in the last several decades. One avenue that has received much attention is boosting a cancer patient's immune system with an anti-cancer vaccine, so that it destroys just the cancerous cells. This has proved an elusive goal, and no treatment has ever been shown to be of repeated worth, in the complete resolution of multiple sites of metastatic disease, until now. Two consecutive trials of our dendritic c ....There have been no major improvements in the treatment of most metastasizing, solid tumours in the last several decades. One avenue that has received much attention is boosting a cancer patient's immune system with an anti-cancer vaccine, so that it destroys just the cancerous cells. This has proved an elusive goal, and no treatment has ever been shown to be of repeated worth, in the complete resolution of multiple sites of metastatic disease, until now. Two consecutive trials of our dendritic cell based vaccine, which uses only cells from the patient to be treated, have each shown a 15% complete, durable, response rate. The remissions have now lasted longer than 3 years in patients otherwise expected to survive less than 1 year, with no serious side effects observed in any of the patients treated. It is likely that part of the success of this treatment is that it targets unique mutations in the patient's own cancer cells, in combination with a powerful immune stimulation from the dendritic cells. In contrast, most carefully run trials, now and in the recent past, have attempted to use more generic targets, common to many patients' cancers. The problem with this approach is likely to be that the patient is tolerant to these, since the targets are common, self proteins. At variance with all previous trials, we found an exact correlation between durable clinical responses and the degree of anti-tumour immunity displayed by the patients T cells. This grant proposal is based on the reasoning that, by studying in depth the characteristics of this successful immune response, in patients with complete, durable, clinical responses, we will be able to make major improvements in the formulation of the therapy.Read moreRead less
Optimising Regulatory T Cell Depletion In Combination With Chemotherapy For Enhanced Anti-tumour Immunity
Funder
National Health and Medical Research Council
Funding Amount
$264,816.00
Summary
The drug cyclophosphamide helps the immune system attack cancer by decreasing the number of immune cells that suppress an immune response to cancer ('Regulatory T cells'). This project combines standard chemotherapy with the drug cyclophosphamide in people with mesothelioma and lung cancer. The aim of the project is to find the dose of cyclophosphamide that maximally decreases Regulatory T cells in each patient, and determine the effect of this on anti-tumour immunity and response to treatment.
Gastrokine 2: A Novel Stomach-specific Tumour Suppressor Gene
Funder
National Health and Medical Research Council
Funding Amount
$342,735.00
Summary
We will evaluate how a natural protein called gastrokine 2 acts to prevent cancer from developing in the stomach. We will show how gastrokine 2 interacts with another stomach protein TFF1, to block the effects of the inflammatory and cancer causing bacterium Helicobacter pylori, and the way that this bacterium circumvents this by turning off the production of gastrokine 2. Finally a drug which inhibits stomach tumour growth by turning on gastrokine 2 will be tested.