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Liver Lipotoxicity And NASH: Mechanistic Roles Of Free Cholesterol, Saturated FFA, JNK1 And TLR4
Funder
National Health and Medical Research Council
Funding Amount
$429,712.00
Summary
Non-alcoholic fatty liver disease (NAFLD) occurs in overweight people, diabetes and with high blood pressure and raised cholesterol. This research is about how cholesterol in liver cells interacts with long chain fatty acids to cause injury and inflammation (steatohepatitis, NASH) in NAFLD.
C-Jun N-terminal Kinase Actions In The Response To Stress
Funder
National Health and Medical Research Council
Funding Amount
$480,127.00
Summary
All cells in our body sense and respond to stressful changes in our environment. We are focused on enzymes called JNKs that relay this information, and so form part of the key response pathways. JNKs are now being evaluated as new drug targets for the treatment of diseases including diabetes and stroke, but we know very little about how JNKs work in stressed cells. We will define new partners for the JNKs and in so doing reveal new information on the stress-activated events they regulate.
C-Jun N-terminal Kinase Regulation Of Microtubule Destabilizer, Stathmin - A Novel Cytoprotective Pathway
Funder
National Health and Medical Research Council
Funding Amount
$550,230.00
Summary
The loss of heart muscle cells during heart attack and heart failure worsens the severity of heart disease. We will study how to protect heart muscle cells by identifying the molecules involved in controlling survival responses. We will use this knowledge to prevent heart muscle cells from dying when exposed to a range of normally harmful conditions. Our study has the potential to prevent heart muscle cell loss, improve heart function and prevent muscle damage in heart disease.
New Insights Into Mechanisms That Coordinate Kinase Signalling And Molecular Motors In Mitosis: A Novel Role For The Protein Scaffold WD-repeat Protein 62 (WDR62).
Funder
National Health and Medical Research Council
Funding Amount
$529,122.00
Summary
Proteins perform all functions within a cell. Commonly, different proteins are assembled into large complexes to carry out processes, such as cell division, with significant implications for human health. Scaffold proteins facilitate the proper assembly of large complexes but are a poorly understood protein class. We will perform molecular analysis of a newly discovered scaffold, WDR62, to define how it drives cell division and reveal how this can be exploited to develop new anti-cancer drugs.
Distinct Pathogenic Roles For JNK Signalling In Glomerular And Interstitial Injury In Kidney Disease.
Funder
National Health and Medical Research Council
Funding Amount
$555,892.00
Summary
Our studies have identified a stress-activated mechanism (the JNK signalling pathway) as a therapeutic target in the treatment of kidney disease. The current project will define the role of JNK signaling in individual cell types in the development of different types of kidney disease. These studies will provide new insights into the pathogenesis of kidney disease, and will be highly relevant to other diseases, including atherosclerosis, lung fibrosis and arthritis.
ALCOHOL AND IMPAIRED LIVER REGENERATION: EFFECTS ON MITOGENIC SIGNALING PATHWAYS
Funder
National Health and Medical Research Council
Funding Amount
$365,295.00
Summary
Patients who regularly consume alcohol are slow to recover from liver injury because alcohol poisons the liver's capacity to regenerate itself (grow back). Hence patients with alcohol-induced liver disease have a high mortality and prolonged hospital stays. The applicants have been supported by NHMRC to study how alcohol impairs liver regeneration. They found that the effect is at the level of cell surface receptors for the growth factors that control liver regeneration. Alcohol alters the funct ....Patients who regularly consume alcohol are slow to recover from liver injury because alcohol poisons the liver's capacity to regenerate itself (grow back). Hence patients with alcohol-induced liver disease have a high mortality and prolonged hospital stays. The applicants have been supported by NHMRC to study how alcohol impairs liver regeneration. They found that the effect is at the level of cell surface receptors for the growth factors that control liver regeneration. Alcohol alters the function of these receptors. One major discovery has been that it damages the capacity to generate a rise in calcium within the cell, something that is fundamentally required for any cell to divide and reproduce itself. Thus when a rise in calcium was produced artificially (with chemicals to unlock the internal calcium stores), liver cells from alcohol-fed rats once more responded normally under the influence of growth factors and replicated themselves. The present work isdesigned to find out where this effect of calcium is exerted. The investigators believe that it is related to how other types of signals work, the so-called protein kinase pathways. These are cascades of one protein turning on (activating) the next down the line to ultimately switch on the genes that control cell growth. They will manipulate liver cells from alcohol-fed rats in culture to establish which of these pathways is most affected, and which is the most critical for the control of cell division genes. These studies will greatly advance our understanding about how alcohol impairs liver regeneration. They will give new insight into the control of liver cell growth and division that is such a crucial response of the liver to injury, vital for survival of the liver. This kind of knowledge will open the door for new treatments to be designed that can control liver growth - turn it back on when it has been poisoned, or turn it off when it is inappropriately vigorous and predisposing to liver cancer.Read moreRead less
Targeting Protein Kinase C In Diabetes Management Using Novel Polyunsaturated Fatty Acids
Funder
National Health and Medical Research Council
Funding Amount
$150,000.00
Summary
PKC regulates a diverse range of cellular processes in an isozyme-specific manner. There is strong recent evidence to implicate PKC, especially PKC _, in mediating the actions of glucose in diabetes. This includes the action of glucose in renal glomeruli, retina, aorta and heart of diabetic animals and in cultured cells from these organs. More importantly, inhibition of PKC_ with the PKC_-specific inhibitor, LY333531, blocks the actions of glucose. Recently, our research group designed and synth ....PKC regulates a diverse range of cellular processes in an isozyme-specific manner. There is strong recent evidence to implicate PKC, especially PKC _, in mediating the actions of glucose in diabetes. This includes the action of glucose in renal glomeruli, retina, aorta and heart of diabetic animals and in cultured cells from these organs. More importantly, inhibition of PKC_ with the PKC_-specific inhibitor, LY333531, blocks the actions of glucose. Recently, our research group designed and synthesised a family of novel polyunsaturated fatty acids. One of these, MP5 (_-oxa- 21:3n-3), inhibited high glucose-induced activation of PKC? in cultured mesangial cells as well as in glomeruli of diabetic rats in a relatively selective manner. The overall aim of this proposal is to evaluate the potential for a chemically engineered novel polyunsaturated fatty acid, MP5 (_-oxa-21:3n-3), to treat pathogenesis associated with diabetes by targeting the PKC system. The specific aims are to: 1. Characterise the effects of MP5 on glucose- or advanced glycosylation end product-stimulated activation of protein kinase C (PKC). 2. Determine whether esterification of MP5 into diacylglycerol is essential for the action of MP5 3. Investigate whether MP5 is efficacious at preventing the actions of glucose in vitro e.g. glucose stimulated TGF_ production in mesangial cells, and in vivo in streptozotocin-diabetic rRead moreRead less