The Effect Of Dietary Fatty Acids On Cellular Calcium Handling Mechanisms In Cardiac Muscle
Funder
National Health and Medical Research Council
Funding Amount
$275,765.00
Summary
A major health problem in the developed countries is cardiovascular disease, which is manifest as high blood pressure, stroke, heart attack and abnormalities of heart rhythm, or cardiac arrhythmias. A western diet, ie. one high in animal fat, or saturated fats, may be to blame. Human epidemiological studies have shown that consumption of a diet high in saturated fats is correlated with a propensity to arrhythmias while a diet high in polyunsaturated fatty acids (PUFAs) can confer protection from ....A major health problem in the developed countries is cardiovascular disease, which is manifest as high blood pressure, stroke, heart attack and abnormalities of heart rhythm, or cardiac arrhythmias. A western diet, ie. one high in animal fat, or saturated fats, may be to blame. Human epidemiological studies have shown that consumption of a diet high in saturated fats is correlated with a propensity to arrhythmias while a diet high in polyunsaturated fatty acids (PUFAs) can confer protection from coronary heart disease and cardiac arrhythmias. The mechanisms underlying these effects are not fully understood. The contraction of the heart depends on changes in calcium inside the individual muscle cells. Abnormalities of the way calcium is handled in the cells leads to abnormalities of contraction and to a certain types of arrhythmia. Over the last 5 to 10 years, technological developments have enabled us to examine changes in calcium in living heart cells at microscopic level. It is possible to fill individual living cells with a fluorescent dye which changes either the magnitude or the wavelength of its fluorescence according to the ambient calcium concentration. Cells filled with these dyes are examined with a laser scanning confocal microscope, in which a very tightly focussed laser beam excites the dye and the resulting fluorescence is gathered by a computer controlled image analysis system. In this way we can measure the calcium concentration within the cells with a spatial resolution of about 1-1000 of a millimetre, and a time resolution of about 1-100 of a second. Using these techniques, we have found that supplementing the diet of rats with either PUFAs or saturated fats produces a dramatic change in the way that calcium is stored and released in their heart cells. This effect of dietary fats has not been reported before, and it may represent an important clue as to how these substances protect against many cardiac arrhythmias.Read moreRead less
Optimising The Bone And Cardiovascular Response To Dietary Calcium: A Physiological Approach In Experimental Models
Funder
National Health and Medical Research Council
Funding Amount
$35,670.00
Summary
We aim to identify a variable calcium diet that optimises bone mass, density and strength as well as blood pressure in a rat model of intrauterine growth restriction. We propose that a moderate calcium diet followed by a high calcium diet is beneficial for bone and heart health. This is based on the physiological effect of reduced calcium intake stimulating intestinal calcium absorption. This represents a novel research approach to improving calcium intake, bone as well as heart health.
Extension Of The Calcium Intake Fracture Outcome Study
Funder
National Health and Medical Research Council
Funding Amount
$272,025.00
Summary
Osteoporosis is a largely preventable disease yet 1 in 10 Australians have osteoporosis. Every year >64,000 osteoporotic fractures occur, which is one every 8.1 minutes and women are three times as likely to have the disease than men. The Bone and Calcium Research Group at the University of Western Australia, is studying how to prevent osteoporosis in elderly women. This study is called the Calcium Intake Fracture Outcome Study or CAIFOS. During 1998, 1,500 women were recruited to study wheth ....Osteoporosis is a largely preventable disease yet 1 in 10 Australians have osteoporosis. Every year >64,000 osteoporotic fractures occur, which is one every 8.1 minutes and women are three times as likely to have the disease than men. The Bone and Calcium Research Group at the University of Western Australia, is studying how to prevent osteoporosis in elderly women. This study is called the Calcium Intake Fracture Outcome Study or CAIFOS. During 1998, 1,500 women were recruited to study whether a daily calcium supplement for 5 years helps to prevent fractures compared to a diet without a supplement. To do this only half of the women were given calcium supplements and the other half were given matched placebo tablets. Each year the study participants are reviewed and asked whether or not they have broken any bones and have other measurements to monitor their bone health and overall health. The subjects are entering their last year of treatment and will finish the study during 2003. At this appointment all subjects will undergo the same series of measurements that they had at the beginning of the study to determine whether or not they have fractured any bones, improved their bone mass and overall health during the treatment stage. The main outcome of the study is to determine whether calcium is useful as a supplement to prevent osteoporotic fracture in elderly women. If this study finds that fewer women fractured in the calcium treated group compared to the non treated group, given that both groups were similar to begin with, we can say that supplementation with calcium prevents fractures. Thus, public health messages about preventing osteoporosis will be able to direct the community to take supplements to prevent a disease that creates pain and disability in later life. The advantage of this study is that it is studying other aspects of these women health, so we can determine whether the calcium is safe to use and improves people's quality of life.Read moreRead less
Identifying Why Some People Consume Excess Dietary Fat. A Twin Study
Funder
National Health and Medical Research Council
Funding Amount
$365,462.00
Summary
Obesity is a significant public health problem, yet some individuals are less susceptible to the development of obesity. High fat eating patterns are commonly associated with overweight/obesity. The taste system is the gatekeeper of digestion and the sense of taste responds to fat, and that the fat taste response is associated with obesity. Using twins as subjects to disentangle the influences of 'nature and nuture', in this project we will identify the mechanisms responsible for linking fat tas ....Obesity is a significant public health problem, yet some individuals are less susceptible to the development of obesity. High fat eating patterns are commonly associated with overweight/obesity. The taste system is the gatekeeper of digestion and the sense of taste responds to fat, and that the fat taste response is associated with obesity. Using twins as subjects to disentangle the influences of 'nature and nuture', in this project we will identify the mechanisms responsible for linking fat taste response to development of obesity.Read moreRead less
Assessment Of Calcium Signaling In Breast Cancer Cells Associated With Epithelial-mesenchymal Transition
Funder
National Health and Medical Research Council
Funding Amount
$116,762.00
Summary
This research will assess the role of specific proteins that control cell function in a process which is important in the spread of cancer cells throughout the body. The work is aimed at identifying new targets for drugs that may be used to prevent or stop the spread of breast cancer cells to other organs such as the brain and liver.
Calcium acts as a signal to control cell processes important in cancer. The entry of calcium into the cell is regulated by calcium channels and we have found some channels are over-expressed in breast cancer. Altering the expression and activity of these calcium channels is a possible therapeutic approach for cancer. We will determine the reasons and consequences of alterations of calcium channels in breast cancer and whether they are viable anti-cancer therapies and biomarkers.
Should You Be Eating That? Food-derived Bacteria And Their Role In Treating Disease
Funder
National Health and Medical Research Council
Funding Amount
$1,405,182.00
Summary
The clinical application of medicines based on the microbes that exist as part of microbiomes is now a reality. Despite these rapid advances understanding how the bacteria are transmitted and recolonise after disruption is essential. Our preliminary data suggests that the average Australian adult consumes over 10 million bacteria per day in their diet. This project seeks to understand these relationships and how they can be exploited to develop the next generations of microbiome based medicine.
Efficacy And Cost Effectiveness Of Varying Levels Of Technology-delivered Personalised Feedback On Dietary Patterns In Motivating Young Australian Adults To Improve Diet Quality And Eating Habits: The Advice, Ideas And Motivation For My Eating Study
Funder
National Health and Medical Research Council
Funding Amount
$592,756.00
Summary
This project will test efficacy and cost-effectiveness of technology based tools in helping young adults to improve their dietary patterns and nutrition related health. Major challenges faced by young adults include lack of access to personalised information and advice about usual dietary intakes, being effectively engaged and cost. The project results will be translated and scaled up strategically by working in partnership with the Young and Well CRC and key organisations.