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Tumour B-cells From Lymphomas Are Resistant To ATP-mediated Apoptosis Due To Non-functional P2X7 Receptors
Funder
National Health and Medical Research Council
Funding Amount
$226,320.00
Summary
Adenosine triphosphate (ATP) is an important constituent normally present inside cells. When added to normal lymphocytes (or released by cells lining the vessel wall or in lymph nodes), ATP acts from outside these cells to open a pore as well as activate an enzyme which digests the lipid envelope of the cell. This loss of lipid covering of the cell produces a leakiness to various constituents of the cell which gradually leads to death of normal lymphocytes. However in the malignant lymphocytes o ....Adenosine triphosphate (ATP) is an important constituent normally present inside cells. When added to normal lymphocytes (or released by cells lining the vessel wall or in lymph nodes), ATP acts from outside these cells to open a pore as well as activate an enzyme which digests the lipid envelope of the cell. This loss of lipid covering of the cell produces a leakiness to various constituents of the cell which gradually leads to death of normal lymphocytes. However in the malignant lymphocytes of human lymphomas this mechanism of cell death does not operate. The loss of function of this 'death receptor' explains why in the lymphomas there is a progressive accumulation of malignant lymphocytes which give enlargement of lymph nodes and spleen and leads to death of the patient. Knowledge of the defect in this pathway of cell death will enable new strategies to be introduced to control this malignant disease.Read moreRead less
A major feature ofcancer is accelerated cell growth and proliferation. One of the major rate-limiting processes that regulates cell growth is the synthesis of ribosomes (the protein synthetic machinery). This study will examine a factor termed UBF whose activity is critical for the regulation of ribosome synthesis. It wll also explore the hypothesis that dysregulation of ribosome biogeneis underlies and contributes to the aetiology of many human cancers.
The Regulation And Differentiation Potential Of Human Memory B Lymphocytes
Funder
National Health and Medical Research Council
Funding Amount
$227,036.00
Summary
Antibody produced by our immune system plays a critical role in protecting us from infectious disease. Remarkably our ability to make antibodies is much faster the second time we see the infection. This memory of the previous attack occurs due to the formation of memory B cells that circulate in the blood, sometimes for years, looking for the same intruders. If they detect the infection they rapidly become activated and remake the antibody. These memory cells are very important for our protectio ....Antibody produced by our immune system plays a critical role in protecting us from infectious disease. Remarkably our ability to make antibodies is much faster the second time we see the infection. This memory of the previous attack occurs due to the formation of memory B cells that circulate in the blood, sometimes for years, looking for the same intruders. If they detect the infection they rapidly become activated and remake the antibody. These memory cells are very important for our protection. Vaccines operate by tricking the immune system into making these memory cells, even though the body hasn't seen the actual disease. Although clearly vital for our health little is known about the activation and antibody production by human B memory cells. This project will redress our lack of knowledge by performing a comprehensive evaluation of the properties of this important cell type.Read moreRead less
A Transcription Factor Network Constraining The Development Of B Cell Leukaemia
Funder
National Health and Medical Research Council
Funding Amount
$617,531.00
Summary
B cell leukemias are relatively common, often aggressive hematopoietic malignancies and their cause is unknown in many cases. We have found that deficiencies in several transcription factors that normally control B cell differentiation cause B cell leukemias at a high frequency. We wish to identify the key pathways that are regulated by these factors and, in normal cells, prevent leukemic transformation. This will help to identify potential targets for therapeutic intervention.
RNA Polymerase I: A Novel Target In The Treatment Of MYC Driven Malignancies
Funder
National Health and Medical Research Council
Funding Amount
$605,963.00
Summary
Synthesis of ribosomes, the cellular protein synthetic machinery, is dysregulated during cancer leading to the hypothesis that it may be causative in the malignant process. This application will test this hypothesis using novel inhibitors or ribosome biogenesis in a mouse genetic model termed E�-MYC that faithfully that replicates human B-cell lymphoma. These studies will uncover novel mechanisms in malignant transformation and identify new therapeutics in the treatment of human cancer.
The Role Of CD30 Overexpression In CD30-positive Non-Hodgkins Lymphomas
Funder
National Health and Medical Research Council
Funding Amount
$457,242.00
Summary
The CD30 molecule sits on the surface of normal blood cells, but in a type of cancer called Lymphoma, CD30 concentration is high. The level of expression of CD30 may determine if the cancer cell is killed by the normal defense mechanisms or is able to grow uncontrollably. We are studying the control elements of the CD30 gene to understand how control is lost when the cell becomes cancerous. This knowledge may lead to therapeutic strategies to control lymphoma.
Regulation Of PtdIns(3,4)P2 Signalling By Inositol Polyphosphate 4-phosphatase-1
Funder
National Health and Medical Research Council
Funding Amount
$557,939.00
Summary
Normally cells only divide when they receive a stimulus such as from a hormone or growth factor. One of the signaling pathways which responds to growth factor stimulation is the PI3-kinase pathway. This pathway has been implicated in many different human cancers which occur when cells divide uncontrollably and invade into the surrounding tissues. We have idenitified a novel enzyme called the inositol polyphosphate 4-phosphatase that appears to regulate cell proliferation and differentiation.
Regulation Of Ribosomal Gene Transcription By C-MYC During Differentiation And Lymphomagenesis.
Funder
National Health and Medical Research Council
Funding Amount
$287,261.00
Summary
A fundamental question in medical biology revolves around how cells respond to the demands to grow and produce proteins, particularly in the setting of the rapid growth of cancer cells. One of the important facets of cellular growth is the production of new proteins needed for all areas of cell life. It is well known that cellular growth involves the production of proteins and this in turn requires the transcription or duplication of ribosomal RNAs (rRNAs). The control of rRNA synthesis, however ....A fundamental question in medical biology revolves around how cells respond to the demands to grow and produce proteins, particularly in the setting of the rapid growth of cancer cells. One of the important facets of cellular growth is the production of new proteins needed for all areas of cell life. It is well known that cellular growth involves the production of proteins and this in turn requires the transcription or duplication of ribosomal RNAs (rRNAs). The control of rRNA synthesis, however, is not well understood. We have identified a novel process to link a cancer causing gene c-MYC to the control of protein production in cells through regulation of rRNA synthesis. Our experiments will examine the hypothesis that c-MYC directly affects the production of rRNA . Finally we will test the link between the ability of c-MYC to cause malignant growth of cells and its role in increasing synthesis of rRNA. These findings may lay the basis for new treatments for disorders of regulated cell growth such as cancer.Read moreRead less