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The Role Of A Phosphorylated Ser/Tyr Bidentate Motif In Leukemia And Myeloproliferative Disorders
Funder
National Health and Medical Research Council
Funding Amount
$279,254.00
Summary
The ability of a normal cell to survive and grow is subject to tight control. Cancer cells escape both these controls and survive and grow in an deregulated manner. Many therapies that are in clinical use or in pre-clinical development target the growth of cancer cells. While such an approach has the advantage of being highly effective in stopping the advance of cancer cell growth, it may allow the long-term survival of some cancer cells and increase the possibility that these cells will become ....The ability of a normal cell to survive and grow is subject to tight control. Cancer cells escape both these controls and survive and grow in an deregulated manner. Many therapies that are in clinical use or in pre-clinical development target the growth of cancer cells. While such an approach has the advantage of being highly effective in stopping the advance of cancer cell growth, it may allow the long-term survival of some cancer cells and increase the possibility that these cells will become resistant to drug treatment leading to disease relapse. On the other hand, therapies that target the survival of malignant cells would be expected to pull the rug from underneath cancer by killing the malignant cells regardless of whether they are growing or not. We have identified a signalling device in normal blood cells that controls both the growth and survival of cells. This device is in effect a switch with 2 components both of which are normally turned on and off. These 2 components are differentially wired to to the cell transmitting unique signals. Importantly, we have found that this switch is faulty in blood cancers and is permanently on in some leukemias promoting their prolonged life-span. Targetting specific components of this unregulated switch may provide new and improved approaches for the development of therapeutics in the treatment of leukemia.Read moreRead less
CD164: A Sialomucin Adhesion Molecule With Potent Growth Inhibitory Properties
Funder
National Health and Medical Research Council
Funding Amount
$242,545.00
Summary
Blood cell production in the adult mammal is normally restricted to the bone marrow. The ongoing production of blood cells is well regulated and dependent on the controlled proliferation and development of rare, multipotent precursors cells commonly termed stem cells. The blood forming stem cells exist in intimate contact with other cells and tissues that comprise the red bone marrow tissue. It is currently thought that stem cell localisation, survival and growth within the bone marrow is, in pa ....Blood cell production in the adult mammal is normally restricted to the bone marrow. The ongoing production of blood cells is well regulated and dependent on the controlled proliferation and development of rare, multipotent precursors cells commonly termed stem cells. The blood forming stem cells exist in intimate contact with other cells and tissues that comprise the red bone marrow tissue. It is currently thought that stem cell localisation, survival and growth within the bone marrow is, in part, regulated by specific interactions between the stem cells and neighbouring cells or the biochemical products of these cells. Stem cells use specific cell surface structures or cell adhesion molecules to mediate these important interactions. This project seeks to investigate the role in blood cell production, of a specific cell surface molecule, CD164, a member of a larger family of molecules with similar structural features thought to be involved in inhibition of cell growth. The main focus of the project is to identify a ligand or binding molecule for CD164. This information will allow an investigation of the consequences of binding between CD164 and its ligand by stem cells. It is proposed that the CD164-ligand interaction is one of a number of important inhibitory interactions used to regulate proliferation of stem cells. These studies will be greatly facilitated by the generation of a mouse lacking CD164.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
We propose to use a number of genetic approaches to identify key mutations involved in Polycythemia vera. We will analyse patient material, use cell lines and mouse models to investigate any new mutations. We also aim to dissect the role of an important blood cell surface receptor and its cooperation with the mutation in JAK2 recently shown to be important in this disease. These approaches will lead to better understanding of the disease and potential new diagnostic and drug strategies.
Parkinson's Disease is caused by injury to a group of brain cells called the Basal Ganglia. Our current ideas about how this part of the brain works is dominated by a well know theory. This theory requires that the output pathway of the basal ganglia to have a negative or inhibitory influence on its target. However there are numerous reasons why this would be unlikely, including some recent evidence from experiments in our laboratory. The purpose of this study is to undertake an extensive re exa ....Parkinson's Disease is caused by injury to a group of brain cells called the Basal Ganglia. Our current ideas about how this part of the brain works is dominated by a well know theory. This theory requires that the output pathway of the basal ganglia to have a negative or inhibitory influence on its target. However there are numerous reasons why this would be unlikely, including some recent evidence from experiments in our laboratory. The purpose of this study is to undertake an extensive re examination of the output paths of the Basal Ganglia. If our suspicions are correct, it will lead to a review of the whole way in which we think the Basal Ganglia works.Read moreRead less
Cancer is the result of multiple genetic errors, involving both the overactivity of growth-stimulating oncogenes and the loss of tumour suppressor genes. The identification of the genes in both of these categories is important if we are to understand and intervene in the disease. Tumour suppressors are the more difficult to identify, precisely because they are lost in cancer cells. Normally the task is extremely time consuming, tedious and expensive. We have developed a system which will provide ....Cancer is the result of multiple genetic errors, involving both the overactivity of growth-stimulating oncogenes and the loss of tumour suppressor genes. The identification of the genes in both of these categories is important if we are to understand and intervene in the disease. Tumour suppressors are the more difficult to identify, precisely because they are lost in cancer cells. Normally the task is extremely time consuming, tedious and expensive. We have developed a system which will provide a short-cut to the cloning of one such gene. We have started with the mouse version, which is lost in leukemic cells. We have mapped the gene to within a very small chromosomal region, and we have identified a biological effect which correlates with loss of the gene. Our next step is to combine these two approaches to clone the gene. Because these genes are always highly conserved between species, we will be able to quickly clone the corresponding human gene, the loss of which is very likely to be important in cancer of various types.Read moreRead less
Cellular bases of enteric neural circuitry underlying gut propulsion. This project aims to investigate the neural bases of behaviour in the mammalian gut. The Enteric Nervous System (ENS) plays a critical role in the propulsion of intestinal contents. This project expects to establish how specific functional classes of enteric neurons control propulsion along the gut. By recording the simultaneous neural activity from hundreds of different functional classes of enteric nerve cells simultaneously ....Cellular bases of enteric neural circuitry underlying gut propulsion. This project aims to investigate the neural bases of behaviour in the mammalian gut. The Enteric Nervous System (ENS) plays a critical role in the propulsion of intestinal contents. This project expects to establish how specific functional classes of enteric neurons control propulsion along the gut. By recording the simultaneous neural activity from hundreds of different functional classes of enteric nerve cells simultaneously, whilst recording intestinal muscle electrical activity and the movements of the gut wall, the project expects to identify which enteric neurochemical classes of neurons generate specific motor patterns along the intestine.Read moreRead less
How does timing affect mammalian brain development and evolution? This project aims to generate fundamental knowledge on the origin of diversity in mammalian brain circuits by studying development of marsupials and rodents. The expected outcome is to elucidate how differences in the timing, rate and sequence of development of gene expression, cell differentiation and circuit formation can relate to the origin of key evolutionary innovations in the mammalian brain. The significance of understandi ....How does timing affect mammalian brain development and evolution? This project aims to generate fundamental knowledge on the origin of diversity in mammalian brain circuits by studying development of marsupials and rodents. The expected outcome is to elucidate how differences in the timing, rate and sequence of development of gene expression, cell differentiation and circuit formation can relate to the origin of key evolutionary innovations in the mammalian brain. The significance of understanding the dynamics of developmental systems that shape complex brain traits includes establishing new developmental paradigms in evolutionary theory, generating new tools to investigate and manipulate brain gene expression in vivo, and the potential discovery of the causes of neurodevelopmental dysfunction.Read moreRead less
Early formation of the preplate establishes the cerebral cortex. The cerebral cortex is arguably the most complex area of the brain due to its ability to process and integrate a wide variety of information in a seamless manner. To understand how this occurs, it is essential to understand how the cerebral cortex is built during embryonic life. The focus of this project is on the formation of the very earliest neurons of the cortex, called preplate neurons. This project aims to: test a new model f ....Early formation of the preplate establishes the cerebral cortex. The cerebral cortex is arguably the most complex area of the brain due to its ability to process and integrate a wide variety of information in a seamless manner. To understand how this occurs, it is essential to understand how the cerebral cortex is built during embryonic life. The focus of this project is on the formation of the very earliest neurons of the cortex, called preplate neurons. This project aims to: test a new model for preplate development with regards to their origin; their function in formation of the cerebral cortex; and the the molecular mechanisms underlying their development. This work provides a developmental framework for understanding how the cerebral cortex is established.Read moreRead less
The role of LIM Kinase 1 in neurons. The aim of this project is to study LIM domain kinase 1 in neuronal function, using cell and mouse models. Unrestricted brain function is essential to one’s wellbeing and the ability to perform normally. Critically contributing to the function of neurons is a cytoskeleton which maintains morphology and function. However, molecular mechanisms underlying cytoskeletal dynamics are poorly understood. LIM domain kinase 1, a key regulator of the actin cytoskeleton ....The role of LIM Kinase 1 in neurons. The aim of this project is to study LIM domain kinase 1 in neuronal function, using cell and mouse models. Unrestricted brain function is essential to one’s wellbeing and the ability to perform normally. Critically contributing to the function of neurons is a cytoskeleton which maintains morphology and function. However, molecular mechanisms underlying cytoskeletal dynamics are poorly understood. LIM domain kinase 1, a key regulator of the actin cytoskeleton decreased with age and its loss associated with deficits in memory and neuronal morphology. This project could reveal fundamental processes regulating and maintaining brain function.Read moreRead less