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The Role Of TGF-beta Signaling In Suppression Of Stat3-mediated Tumorigenesis
Funder
National Health and Medical Research Council
Funding Amount
$667,000.00
Summary
Stomach cancer is the third most prevalent cancer in the Western World and result in the yearly death of several thousand people in Australia alone. We have discovered a specifice gene mutation of a receptor molecule called gp130 that results in the formation of stomach cancer in mice. We are now aiming to understand the exact molecular events by which this mutation results in the uncontrolled growth of stomach mining cells. Our proposal combines the expertise of the two investigators in signal ....Stomach cancer is the third most prevalent cancer in the Western World and result in the yearly death of several thousand people in Australia alone. We have discovered a specifice gene mutation of a receptor molecule called gp130 that results in the formation of stomach cancer in mice. We are now aiming to understand the exact molecular events by which this mutation results in the uncontrolled growth of stomach mining cells. Our proposal combines the expertise of the two investigators in signal transduction and the making of genetically modified mouse models. These strategies will be employed to specifically address in the laboratory mouse the function of two specififc signaling cascades, called Stat3 and TGF-beta. The identification of detailed description by which these molecules causally relate to cancer formation will provide clear and specific molecular targets for future therapies to treat various cancers, including those of the stomach.Read moreRead less
MECHANISMS OF MOTILITY AND METASTASIS In BREAST CANCER
Funder
National Health and Medical Research Council
Funding Amount
$209,505.00
Summary
The broad aim of this proposal is to elucidate novel molecular mechanisms of breast cancer cell motility that are relevant to metastasis or the spread of cancer. The function of two genes will be studied. We propose that (1) reduced on-random motile (ROM) regulates the speed of cancer cell movement, and (2) Neural Wiskott-Aldrich syndrome protein (N-WASP) regulates the directional component of cell movement. We will relate the function of ROM and N-WASP to rapid, linear walking along collagen fi ....The broad aim of this proposal is to elucidate novel molecular mechanisms of breast cancer cell motility that are relevant to metastasis or the spread of cancer. The function of two genes will be studied. We propose that (1) reduced on-random motile (ROM) regulates the speed of cancer cell movement, and (2) Neural Wiskott-Aldrich syndrome protein (N-WASP) regulates the directional component of cell movement. We will relate the function of ROM and N-WASP to rapid, linear walking along collagen fibres in live tumours and to breast cancer metastasis to the lung. ROM will be inhibited in breast cancer cells and we expect increases in both the speed of cell movement and metastasis. Therefore, ROM functions as a suppressor of metastasis. Inhibition of N-WASP, however, is expected to compromise both the directionality of cell movement and metastasis. N-WASP is therefore, a promoter of metastasis. At the completion of this work, the regulatory mechanisms of motility and metastasis by ROM and N-WASP will be defined. This will facilitate the development of biologically targeted agents for ROM and N-WASP that can be used to control metastasis. In addition, these agents that target the motility pathway are appropriate for use in combined therapy with agents that target a different pathway such as survival or growth. This will significantly improve disease control rates or the proportion of patients with partial or complete disease regression. This proposal addresses the National Health Priority, cancer, and related National Research Priority, ageing well and ageing productively, where in the longer term, we will be able to create new and much needed therapy for metastasis.Read moreRead less
Assembly Of Mitochondrial Respiratory Chain Complexes And Defects Associated With Disease
Funder
National Health and Medical Research Council
Funding Amount
$464,610.00
Summary
A group of protein assemblies termed respiratory complexes are found in the inner membrane of mitochondria in our cells and are responsible for producing most of our energy. These complexes consist of many different protein subunits and are built by the help of numerous known and unknown assembly factors. For example, assembly of Complex I of the respiratory chain requires 39 different proteins that are made outside mitochondria and are then transported inside to be somehow joined together with ....A group of protein assemblies termed respiratory complexes are found in the inner membrane of mitochondria in our cells and are responsible for producing most of our energy. These complexes consist of many different protein subunits and are built by the help of numerous known and unknown assembly factors. For example, assembly of Complex I of the respiratory chain requires 39 different proteins that are made outside mitochondria and are then transported inside to be somehow joined together with the 7 other subunits that are made by mitochondria. This is clearly a complicated procedure and we have little information on how its assembly is achieved. We do know however that mistakes in the assembly of these complexes (particularly Complex I) do happen. In Australia, about 50 children born each year have inherited disorders of mitochondrial energy generation. The most severe disorders cause infant death, while others present later causing a range of degenerative diseases, particularly affecting brain, muscle and heart. Defects in the respiratory chain have also been implicated in Parkinson's disease, Alzheimer's disease, type-2 diabetes and in cell death. In order to understand how respiratory complex defects cause disease, we need to understand more about how these complexes are built. The aim of this proposal is to investigate how Complex I is assembled, how it interacts with other respiratory complexes, and to identify and characterise proteins that aid in its assembly. We will also analyse assembly defects in cells from patients with suspected respiratory complex deficiencies. This work will aid in our understanding of not only how protein complexes are built, but how defects in their assembly can cause disease. This will be informative to families of affected individuals and may aid in future diagnosis and prevention of diseases where defects in mitochondria are implicated.Read moreRead less