Improving Efficacy Of Vaccination Against The Gut Pathogen Helicobacter Pylori
Funder
National Health and Medical Research Council
Funding Amount
$504,000.00
Summary
Helicobacter pylori are bacteria which live in the stomachs of half the World's population, where they are the main cause of two types of stomach cancers, as well as stomach and duodenal ulcers. The development of a vaccine against this organism would have a major impact on these diseases. Unfortunately, while there has been some success in animal models, the results from clinical trials have so far been disappointing. A key issue with vaccines against H. pylori is their poor efficacy, i.e. alth ....Helicobacter pylori are bacteria which live in the stomachs of half the World's population, where they are the main cause of two types of stomach cancers, as well as stomach and duodenal ulcers. The development of a vaccine against this organism would have a major impact on these diseases. Unfortunately, while there has been some success in animal models, the results from clinical trials have so far been disappointing. A key issue with vaccines against H. pylori is their poor efficacy, i.e. although they produce a significant reduction in bacteria numbers in animal models, they do not clear all of the bacteria. The remaining bacteria are sufficient to continue to cause disease. It is currently not understood how these vaccines work in mice, which makes it very difficult to improve their design. An additional problem common to all human vaccines, is the lack of a suitable adjuvant. An adjuvant is a non-specific vaccine component which is required to activate the immune system. Thus, for an effective vaccine it is essential to identify suitable adjuvants which will work against H. pylori and can be used in people. The chief investigator on this project has been working in the H. pylori vaccine field, in both academia and industry, for 8 years. He very recently identified an immunisation regime which greatly increases the effectiveness of vaccination against H. pylori in an animal model. The main aim of this project is to further develop this novel discovery to identify key immune factors that are critical to making an improved vaccine. In addition, the two associate investigators are experts in the area of adjuvants for human vaccines, and will help to test new vaccine systems in the H. pylori model. If successful, this project will generate highly significant data that will strongly contribute towards the design of an improved vaccine strategy against H. pylori in people.Read moreRead less
Structural Basis For Helicobacter Pylori Adhesion To Host Epithelial Cells
Funder
National Health and Medical Research Council
Funding Amount
$665,328.00
Summary
The aim of this grant is to understand how the bacteria that cause gastric cancer and ulcers interact with the cells that line the stomach. This information will be used to develop new treatments to combat disease.
Helicobacter Pylori VacA Toxin: Modulation Of Human Mitochondrial Function By A Bacterial Pathogen
Funder
National Health and Medical Research Council
Funding Amount
$508,003.00
Summary
This work will greatly further our understanding of how a bacterium, Helicobacter pylori, causes stomach ulcers and cancer. We will use cutting edge model systems to study the VacA toxin that is secreted from the bacteria and is targeted to human cells. We will examine where the toxin goes and how it affects our cells. It is expected that the improved understanding that will arise from this work will assist researchers to better devise drugs against this prevalent pathogen.
Functional Relationships Of Gastrin And Its Regulators In The Developing And Diseased Gastrointestinal Tracts
Funder
National Health and Medical Research Council
Funding Amount
$607,832.00
Summary
Gastrin is a hormone from the stomach which aids digestion by stimulating acid secretion. However too much acid can cause ulcers of the gastrointestinal tract. Gastrin also stimulates growth of the lining of the stomach and intestines. This growth promoting effect is important for the development of the gastrointestinal tract before birth and may also be involved in a number of cancers especially colon cancer. Several different forms of gastrin are made by endocrine cells of the stomach and by c ....Gastrin is a hormone from the stomach which aids digestion by stimulating acid secretion. However too much acid can cause ulcers of the gastrointestinal tract. Gastrin also stimulates growth of the lining of the stomach and intestines. This growth promoting effect is important for the development of the gastrointestinal tract before birth and may also be involved in a number of cancers especially colon cancer. Several different forms of gastrin are made by endocrine cells of the stomach and by cancers of the colon. It seems that the different types of gastrins have different effects and act through distinct receptors. The production and effects of gastrin are mediated in part by the local factor histamine and modified by the hormone somatostatin. The amount, type and activity of gastrin, and the interactions with histamine and somatostatin, will be measured in foetal and newborn animals, and people with or at risk of developing colon cancer.Read moreRead less
Regulated Intracellular Trafficking Of A Potassium Channel In Gastric Acid-secreting Cells
Funder
National Health and Medical Research Council
Funding Amount
$609,511.00
Summary
The cells of our bodies possess proteins that transport salts and other chemicals. These transport proteins must be correctly positioned in cells, a process that is poorly understood. If transport proteins are not positioned properly then diseases such as heart attack or diabetes may occur. Influencing the position of transport proteins may also be used to treat disease. This work investigates how a transport protein that shuttles potassium is correctly positioned in cells of the stomach.
The Role Of The Gastric H/K ATPase In Parietal Cell Function
Funder
National Health and Medical Research Council
Funding Amount
$166,885.00
Summary
The cells of the body contain many specialised membrane structures. At present it is not clear how the synthesis of these stuctures is directed. To study this problem we are examining the acid secretory parietal cells of the stomach. These cells have a very elaborate membrane system that contains a major proton pump protein. By manipulating the levels and form of the proton pump we will gain novel insights into the mechanism of membrane structure and function.
PREVENTION OF HOSPITAL ACQUIRED PRESSURE ULCERS: A RANDOMISED CONTROLLED TRIAL.
Funder
National Health and Medical Research Council
Funding Amount
$195,652.00
Summary
Pressure ulcers are frequently encountered in hospitalised patients. Several factors such as immobility, poor circulation, malnutrition and aging skin and tissue, along with pressure, moisture and friction (shear) from hospital bedding, contribute to their development. Pressure ulcers usually occur over bony prominences. Here, internal tissue pressures are most intense where the skin contacts the supporting surface. The principles for efficient prevention of pressure ulcers are to reduce pressur ....Pressure ulcers are frequently encountered in hospitalised patients. Several factors such as immobility, poor circulation, malnutrition and aging skin and tissue, along with pressure, moisture and friction (shear) from hospital bedding, contribute to their development. Pressure ulcers usually occur over bony prominences. Here, internal tissue pressures are most intense where the skin contacts the supporting surface. The principles for efficient prevention of pressure ulcers are to reduce pressure on the classic ulcer sites, interrupt the pressure frequently, keep the stressed area dry, and provide a low friction cushioning interface between the patient and bed. Sheepskins have been claimed to be of value in the prevention of pressure ulcers. The therapeutic value is believed to be due to the pressure relieving properties of the dense woolpile, the moisture absorbing properties of the wool and the low friction at the wool-tip surface. The CSIRO Leather Research Centre has facilitated the development of an Australian Standard for Medical Sheepskins. In his address at the launch of this Standard (July 1997), Dr Michael Wooldridge, Federal Minister for Health, stated that pressure ulcers would cost the Australian health system over $350M in that year. To unequivocally establish the efficacy of sheepskins in preventing the onset of pressure ulcers, and to meet the present requirements for evidence based medicine, a rigorous Randomised Controlled Trial is essential. CSIRO, in conjunction with the Royal Melbourne Hospital, The University of Melbourne School of Postgraduate Nursing, Deakin University and Fremantle Hospital, plan to undertake a study into the prevention of hospital acquired pressure ulcers comparing the efficacy of two mattress covers: sheepskin overlays and the standard hospital sheet and mattress with or without other low technological constant pressure supports.Read moreRead less
Understanding The Relationship Of Incretin Hormones, Gastric Emptying And Reactive Hypoglycaemia
Funder
National Health and Medical Research Council
Funding Amount
$132,743.00
Summary
Low blood glucose levels following a meal occur frequently in otherwise healthy people and those who have had surgery for weight loss. It affects quality of life adversely and current management is unsatisfactory. The proposed studies will use sophisticated techniques to evaluate the roles of the rate of stomach emptying and the so-called 'incretin' hormones which stimulate the release of insulin after a meal. The outcomes will have major implications for more rational management.