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Analysis Of The Interaction Of The T-cell Oncoproteins Scl And Lmo2 In T Cell Acute Lymphoblastic Leukaemia
Funder
National Health and Medical Research Council
Funding Amount
$179,149.00
Summary
Leukaemic cells frequently contain alterations to the chromosomes which contribute to the generation of the leukaemia by causing the expression of cancer-promoting genes. In the case of T cell acute lymphoblastic leukaemia (T-ALL), the most frequent target of chromosomal alterations is the Stem Cell Leukaemia gene, or SCL. In leukaemic cells, the SCL protein is found to be associated with another protein, called Lmo2, the gene for which is also activated due to chromosomal alterations in T-ALL. ....Leukaemic cells frequently contain alterations to the chromosomes which contribute to the generation of the leukaemia by causing the expression of cancer-promoting genes. In the case of T cell acute lymphoblastic leukaemia (T-ALL), the most frequent target of chromosomal alterations is the Stem Cell Leukaemia gene, or SCL. In leukaemic cells, the SCL protein is found to be associated with another protein, called Lmo2, the gene for which is also activated due to chromosomal alterations in T-ALL. It is thought that these two proteins must bind each other to cause leukaemia, but this has never been proven. This project aims to test whether removal of SCL and Lmo2 is able to stop the progress of leukaemias which they initiate. We will do this by overexpressing SCL and Lmo2 to establish leukaemia in mice, then removing these genes to see if the leukaemia is cured. We will then test whether removal of the endogenous SCL protein is able to stop the onset and progress of leukaemias initiated by Lmo2. We will do this by removing SCL in mice which overexpress Lmo2. Lastly we will generate mutant SCL proteins which are unable to interact with Lmo2, and co-express these along with Lmo2 in mice to assess whether they are able to co-operate with Lmo2 in causing leukaemia. We predict these mutants which are unable to bind to Lmo2 will be unable to co-operate with it in causing leukaemia. This will identify regions of these proteins which can be used as targets for anti-leukaemia drug development.Read moreRead less
Identification Of Oncogenes From Myeloid Leukaemias By Retroviral Expression Cloning
Funder
National Health and Medical Research Council
Funding Amount
$552,000.00
Summary
The success rates for treatment of most myeloid leukaemias remain relatively poor, with 5-year survival rates of 40-50% overall. Thus there is a clear need for improvements in diagnosis and particularly treatment. An important and relatively new approach for doing this is to target the specific molecular and genetic alterations that lead to these diseases. This requires the identification of these alterations, particularly the oncogenes ('cancer genes') that cause or contribute to the various fo ....The success rates for treatment of most myeloid leukaemias remain relatively poor, with 5-year survival rates of 40-50% overall. Thus there is a clear need for improvements in diagnosis and particularly treatment. An important and relatively new approach for doing this is to target the specific molecular and genetic alterations that lead to these diseases. This requires the identification of these alterations, particularly the oncogenes ('cancer genes') that cause or contribute to the various forms of myeloid leukaemia. However in many cases (up to 50%), the key oncogenes involved in have not and-or cannot be identified using current methods. This project aims to develop and apply a powerful technique called 'retroviral expression cloning' for the identification of oncogenes involved in myeloid leukaemia. In essence our approach is to identify oncogenes from myeloid leukaemia samples on the basis of their function - that is, by virtue of their ability to induce dysregulated or uncontrolled growth of blood-derived cells in culture.Read moreRead less
Differentiation Therapy Of Acute Myeloid Leukaemia: Combining RAR-agonists And G-CSF.
Funder
National Health and Medical Research Council
Funding Amount
$449,500.00
Summary
The application of cancer treatments that target specific molecules hold significant promise. However to apply these treatments detailed knowledge is required of the how the molecular targets function in cells. Our previous work using normal blood cells has identified two genes ( MAD1 and p27KIP1 ) that are required for the effects of one such targeted treatment that is aimed at the retinoic acid receptor alpha. We propose to test this treatment in mouse models of human leukaemia and in human le ....The application of cancer treatments that target specific molecules hold significant promise. However to apply these treatments detailed knowledge is required of the how the molecular targets function in cells. Our previous work using normal blood cells has identified two genes ( MAD1 and p27KIP1 ) that are required for the effects of one such targeted treatment that is aimed at the retinoic acid receptor alpha. We propose to test this treatment in mouse models of human leukaemia and in human leukemia cells grown in the laboratory. By deleting the genes for MAD1 and p27KIP1 we will determine if leukaemias lacking these genes fail to respond to treatments targeting the retinoic acid receptor alpha. We will also test if treatments that target retinoic acid receptors in combination with G-CSF, a protein that has previously been demonstrated to have anti-leukaemic activity, can work together to block growth of leukaemic and genetically modified cells. Together these studies will help define classes of leukamias that either will or will not respond to treatments aimed at retinoic acid receptor to better target future leukemia treatments.Read moreRead less
Molecular And Cellular Determinants Of Tubulin-targeted Drug Action
Funder
National Health and Medical Research Council
Funding Amount
$484,500.00
Summary
Cancer is the leading cause of death in developed countries. Despite advances in the use of combination chemotherapy, drug resistance is the major cause of treatment failure. An important component in the treatment of many childhood and adult cancers are the antimicrotubule agents. These drugs target an important part of the cell skeleton called the tubulin-microtubule system that is responsible for many important events including cell division. It is the ability of these drugs to disrupt cell d ....Cancer is the leading cause of death in developed countries. Despite advances in the use of combination chemotherapy, drug resistance is the major cause of treatment failure. An important component in the treatment of many childhood and adult cancers are the antimicrotubule agents. These drugs target an important part of the cell skeleton called the tubulin-microtubule system that is responsible for many important events including cell division. It is the ability of these drugs to disrupt cell division in cancer cells that makes them so effective and such important targets for new drug design. Unfortunately, the reasons why tumours develop resistance to these drugs or even why some tumours do respond well is not understood. This proposal will determine how the makeup and stability of the tubulin-microtubule proteins influences how these drugs work in both childhood and adult tumour cells. Finally, components of drug resistant tumour cells will be examined using technology that allows us to simultaneously separate and identify hundreds of proteins some of which may provide useful targets for the design of new drugs for the treatment of cancer. To improve cancer survival rates it is essential to accurately target the use of existing drugs and to identify new targets for anticancer drug development.Read moreRead less
Allogeneic stem cell transplantation (SCT) remains the most effect curative treatment for patients with a number of malignant conditions, especially leukemia. The ability to cure leukemia by this procedure relates to a process known as Graft-versus-Leukaemia effects (GVL) which ocurrs when the newly transplanted stem cells (which includes the immune system) recognises the leukemia as foreign and mounts an immune attack against it. These studies will focus on the effect of a cellular pathway invi ....Allogeneic stem cell transplantation (SCT) remains the most effect curative treatment for patients with a number of malignant conditions, especially leukemia. The ability to cure leukemia by this procedure relates to a process known as Graft-versus-Leukaemia effects (GVL) which ocurrs when the newly transplanted stem cells (which includes the immune system) recognises the leukemia as foreign and mounts an immune attack against it. These studies will focus on the effect of a cellular pathway invilving NKT cells that preliminary data suggests is critical to the development of GVL. Methods to augment this activation pathway will be studied in preclinical models that may then be studied in clinical trials with the aim of improving the outcome of patients transplanted for leukemias.Read moreRead less