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Role Of Beta-catenin And Its Regulator FAM In Haemopoietic Stem Cell Function
Funder
National Health and Medical Research Council
Funding Amount
$506,500.00
Summary
Haemopoietic stem cells (HSC) are currently the best characterised adult stem cell (SC) population and currently the only SC population used in cellular therapy. Adult HSC reside in the bone marrow and it is generally accepted that these rare cells cycle slowly and maintain themselves by a process involving self renewal. The cellular physiology that underlies HSC self renewal is still to be defined and no single factor has been described which is able to induce substantial proliferation and expa ....Haemopoietic stem cells (HSC) are currently the best characterised adult stem cell (SC) population and currently the only SC population used in cellular therapy. Adult HSC reside in the bone marrow and it is generally accepted that these rare cells cycle slowly and maintain themselves by a process involving self renewal. The cellular physiology that underlies HSC self renewal is still to be defined and no single factor has been described which is able to induce substantial proliferation and expansion of HSC in a defined system while maintaining critical stem cell properties. Like other SC, a critical characteristic of the rare HSC population of cells is their ability to maintain their unique stem cell properties in vivo (the process of self-renewal) while generating more committed cells which will form large numbers of differentiated and specialized mature blood cells. Recent evidence that HSC can repair other organs under some circumstances raises the possibility that this adult SC population could provide an alternative to embryonic stem cells for many stem cell therapies. If this is the case the therapeutic application of HSC becomes significantly broader. Critical to development of such applications will be an understanding of HSC self renewal and development and new approaches to expand this limited cell population. Major progress in this area will require the definition of both the intrinsic and extrinsic mechanisms that control HSC maintenance and self-renewal. Any findings in this area will have major clinical significance and be of enormous benefit to the community. Here we focus on the role of a known intrinsic regulator of SC behaviour (beta-catenin) with the aim of establishing its role in the maintenance of HSC and its regulation by a novel cofactor (FAM). We will determine if the level of beta-catenin is critical in the maintenance and-or differentiation of haemopoietic stem cells and what role FAM plays in this regulation.Read moreRead less
Hematopoietic Transplants From Autologous Pluripotent Cell Sources
Funder
National Health and Medical Research Council
Summary
This proposal investigates the utility of two types of patient-derived stem cells for transplantation into blood. These are induced pluripotent stem cells that are reprogrammed from specialized tissues such as skin cells, and stem cells derived using the genetic material of oocytes or sperm only ( one-parent embryos). Using the mouse, we are looking at the ability of these cells to form normal blood lineages after transplantation, and to repair blood in a mouse model for beta-thalassemia.
Characterisation Of Human Embryonic Stem Cell Differentiation To Haematopoietic Progenitors And Stem Cells
Funder
National Health and Medical Research Council
Funding Amount
$638,856.00
Summary
Blood stem cells, which are found in the bone marrow, are currently used for treating human blood disorders including leukemia and lymphoma. However, for the majority of bone marrow transplant candidates, suitable donors cannot be found. Using embryonic stem cells, this project aims to define the conditions required to generate blood stem cells in the laboratory. The aim of the work is to provide a new source of blood stem cells that could be used in place of donor derived bone marrow.
Role Of Human Amnion Epithelial Cells In Resolving Hepatic Fibrosis
Funder
National Health and Medical Research Council
Funding Amount
$618,755.00
Summary
When the liver is injured repeatedly by viruses and alcohol, it responds through a wound healing process that can lead to extensive scar tissue in the liver (cirrhosis). This condition may require liver transplantation and lifelong use of drugs to prevent the body from rejecting the new organ. To develop an alternate therapy, we will study if substances secreted by amnion cells from the human placenta (afterbirth), which would normally be discarded, can reduce liver scar tissue in mice .
Role Of The Ets Family Transcription Factor Erg In Stem Cell Function And Hematopoiesis
Funder
National Health and Medical Research Council
Funding Amount
$413,775.00
Summary
The cells responsible for producing blood are called hematopoietic stem cells (HSCs). Our research is focused on the genes that control HSC growth and development. We have discovered that a gene known to cause cancer, Erg, plays a critical role in regulating this process. This Project will tease apart the mechanism by which it does so, provide insights into how Erg can trigger cancer, and help us understand the molecular network of regulators that control blood cell production.
Transcriptional Regulation Of Haematopoietic Stem Cell Development
Funder
National Health and Medical Research Council
Funding Amount
$566,470.00
Summary
Cancer initiating cells acquire stem cell characteristics and self renew within a supportive environment that helps maintain and propagate malignant tumours. Identifying the normal hierarchy of gene regulation within blood stem cells and designing therapies that target key transcription factors (proteins that control other genes) that are over expressed in cancer stem cells is the ultimate goal.
Role Of Selectins And Their Receptors In The Regulation Of The Haemopoietic System
Funder
National Health and Medical Research Council
Funding Amount
$472,500.00
Summary
The production of blood cells occurs in the bone marrow. This process depends on the controlled proliferation and development of rare and multipotent precursors called haemopoietic stem cells, and involves a subtle balance between the positive regulation of proliferation and growth inhibition necessary to prevent blood cell overproduction and leukaemia. We have recently shown that two related proteins expressed at the surface of cells of the bone marrow vasculature negatively regulate blood cell ....The production of blood cells occurs in the bone marrow. This process depends on the controlled proliferation and development of rare and multipotent precursors called haemopoietic stem cells, and involves a subtle balance between the positive regulation of proliferation and growth inhibition necessary to prevent blood cell overproduction and leukaemia. We have recently shown that two related proteins expressed at the surface of cells of the bone marrow vasculature negatively regulate blood cell formation. These proteins, called P-selectin and E-selectin, are essential to regulate the migration of immune cells into lymphoid organs and inflamed tissues. We have found that these selectins also mediate the adhesion of haemopoietic stem cells in the bone marrow vasculature, inhibit their proliferation and kill some of their progeny. This project includes three specific aims to: 1) characterise the role of P-selectin and E-selectin in vivo in the regulation of blood cell formation, 2) understand the molecular mechanisms inside haemopoietic stem cells which are responsible for the growth inhibition and cell death in response to selectins, and 3) identify the receptors which are responsible for these effects of selectins on haematopoietic stem cells. These findings will give us a better understanding of how blood formation is regulated in vivo and how these interactions are perturbed during the emergence of leukaemia.Read moreRead less