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Treatment Of Chronic Proteinuric Renal Disease With DNA Vaccines Against TCR Subsets Of Effector T Cells And Chemokines
Funder
National Health and Medical Research Council
Funding Amount
$282,750.00
Summary
Current treatments for chronic kidney disease are non specific and frequently ineffective. As a consequence, kidney failure progresses to the stage where patients require dialysis or transplantation to remain alive. Every year about 1700 Australians commence dialysis for this reason, and many more die of kidney failure or its complications. This project will develop and test a novel therapeutic strategy of DNA vaccination targeted specifically at groups of white cells, and specific regulatory mo ....Current treatments for chronic kidney disease are non specific and frequently ineffective. As a consequence, kidney failure progresses to the stage where patients require dialysis or transplantation to remain alive. Every year about 1700 Australians commence dialysis for this reason, and many more die of kidney failure or its complications. This project will develop and test a novel therapeutic strategy of DNA vaccination targeted specifically at groups of white cells, and specific regulatory molecules in order to prevent chronic kidney disease (CPRD). In chronic kidney diseases of all types, the kidney filters and surrounding tissue becomes infiltrated with inflammatory cells. The amount of inflammation in the filters and the tissues has an important bearing on the severity of kidney failure, and the rate at which kidney disease progresses. There are a range of different cells that invade the inflamed kidney, some worsen the disease while some may protect against it. Current treatments are non-selective and may, by suppressing inflammation, prevent both repair and protection. We have established a central role for two groups of white cells called macrophages and T lymphocytes in two animal models of kidney disease. In one of these models, we used DNA vaccination, which represents a novel means of switching off these disease-causing T cells. The results showed that DNA vaccination against T cell subsets was protective in our model. This raises the real and exiting possibility that DNA vaccination directed at specific disease-causing cells, and their products are much more likely to be specific and effective therapy for chronic kidney diseases. Eventually, such DNA vaccination may be used as a more effective and safer therapy for human kidney disease.Read moreRead less
Superoxide And The Nitric Oxide-peroxynitrite Pathway In Renal Ischaemia-reperfusion Injury
Funder
National Health and Medical Research Council
Funding Amount
$202,755.00
Summary
Acute renal failure is common and has 50% mortality. Free radicals are vey reactive, unstable molecules that alter normal metabolic reactions. The study aims to determine the role of oxygen-derived free radicals and nitric oxide and their interaction in renal ischaemic injury. The balance between the positive effects of nitric oxide on blood flow and the damaging effects of by-products of the reaction of nitric oxide with superoxide radical (peroxynitrite) on renal tubules may determine the exte ....Acute renal failure is common and has 50% mortality. Free radicals are vey reactive, unstable molecules that alter normal metabolic reactions. The study aims to determine the role of oxygen-derived free radicals and nitric oxide and their interaction in renal ischaemic injury. The balance between the positive effects of nitric oxide on blood flow and the damaging effects of by-products of the reaction of nitric oxide with superoxide radical (peroxynitrite) on renal tubules may determine the extent of cell damage and hence recovery from ischaemic and hypoxic renal injury. Modulation of these opposing forces may lead to strategies to protect and improve renal function in acute renal failure in man.Read moreRead less
Altered Intracellular Signalling In Response To Hyperglycaemia Reflects An Inherent Predisposition To Nephropathy
Funder
National Health and Medical Research Council
Funding Amount
$164,061.00
Summary
Diabetic nephropathy affects 30-50% of patients with diabetes mellitus. The reasons as to why only a proportion of patients develop this devastating complication is not clear. Poor control of blood sugar levels has been well characterised as being of aetiological importance in its genesis, but is clearly not the sole factor responsible. Genetic factors appear to predispose individuals to developing diabetic nephropathy, with a significantly higher number of affected patients having a family hist ....Diabetic nephropathy affects 30-50% of patients with diabetes mellitus. The reasons as to why only a proportion of patients develop this devastating complication is not clear. Poor control of blood sugar levels has been well characterised as being of aetiological importance in its genesis, but is clearly not the sole factor responsible. Genetic factors appear to predispose individuals to developing diabetic nephropathy, with a significantly higher number of affected patients having a family history of hypertension and vascular disease. Our own preliminary studies using cells from human kidneys have demonstrated that there are clearly 2 responses observed with respect to alterations in intracellular signalling after exposure to high glucose concentrations and hormones known to be of importance in the development of diabetic nephropathy (such as angiotensin II and insulin-like growth factor-1). These responses appear to be specific to the patient from which the kidney tissue is derived. Thus the aim of the present study is to determine prospectively, whether the groups differ with regards their intracellular signalling and subsequent development of tubulointerstitial pathology in an in vitro model of diabetes mellitus.Read moreRead less
Contributions Of Intrinsic Renal Cells To Inflammatory Renal Injury
Funder
National Health and Medical Research Council
Funding Amount
$66,433.00
Summary
These studies aim to improve our understanding of glomeruonephritis, the most common cause of kidney failure. They will study the interactions between circulating white blood cells (leukocytes) which originate from the bone marrow , and intrinsic kidney cells in the development of tis disease. Inflammation is the result of recruitment of bone marrow derived inflammatory cells and plasma proteins to a variety of stimuli. The subsequent injury represents the interaction between recruited cells and ....These studies aim to improve our understanding of glomeruonephritis, the most common cause of kidney failure. They will study the interactions between circulating white blood cells (leukocytes) which originate from the bone marrow , and intrinsic kidney cells in the development of tis disease. Inflammation is the result of recruitment of bone marrow derived inflammatory cells and plasma proteins to a variety of stimuli. The subsequent injury represents the interaction between recruited cells and local cells within the target organ. Glomerulonephritis is an important human disease where both bone marrow derived inflammatory and local cells have the potential to contribute to kidney injury by production of signalling molecules called cytokines. This study will determine the contribution of specific cytokines produced by intrinsic renal cells towards the development of inflammatory kidney injury in GN.Read moreRead less
To investigate alternative strategies to treat end stage renal disease we have transplanted embryonic kidneys into the wall of the abdominal cavity of adult hosts where they become vascularised and undergo continued but limited development. Strategies to enhance their growth-development and decrease immunogenicity-rejection will now be determined, and the origin of a 'ureter-like' tube of tissue that grows to connect the transplanted embryonic kidney with the recipient bladder investigated.
Targeting Innate Immunity To Prevent Chronic Dysfunction Of The Transplanted Kidney
Funder
National Health and Medical Research Council
Funding Amount
$497,057.00
Summary
Kidney transplantation is the optimal treatment for patients suffering from end-stage kidney disease. Chronic transplant dysfunction is the major barrier to long-term health after transplantation, and is the subject of this application. Our studies suggest a signaling system activates immunity and leads to chronic transplant dysfunction. We aim to block this signaling system in mouse models to identify clinically applicable treatments to prevent kidney transplant failure.