Using Nanotechnology To Improve The Therapeutic Efficacy Of Iron Chelators
Funder
National Health and Medical Research Council
Funding Amount
$692,769.00
Summary
Iron loading disorders (such as thalassaemia) represent an important class of human disease. As part of the treatment for these diseases, the iron needs to be removed and this is often done using iron-binding drugs known as iron chelators. Current chelators are not ideal due to side effects or onerous delivery methods. The goal of this project is to use nanotechnology to develop more effective ways of delivering chelators to improve their effectiveness and reduce toxicity.
The Chief Investigators have worked as a team for 20 years as part of a successful NHMRC Program Grant that was renewed on three successive occasions and subsequently under a NHMRC Block Grant to QIMR. Their combined expertise covers the whole spectrum from the bedside to the bench with respect to clinical studies and fundamental molecular studies of iron homeostasis. The common theme of iron homeostasis and iron overload pervades virtually all the research of the team. The team�s research has l ....The Chief Investigators have worked as a team for 20 years as part of a successful NHMRC Program Grant that was renewed on three successive occasions and subsequently under a NHMRC Block Grant to QIMR. Their combined expertise covers the whole spectrum from the bedside to the bench with respect to clinical studies and fundamental molecular studies of iron homeostasis. The common theme of iron homeostasis and iron overload pervades virtually all the research of the team. The team�s research has led to fundamental observations of iron regulation and homeostasis and the development of guidelines for the management of, and screening for, haemochromatosis, recognized as the most common inherited disorder of Caucasian populations. The proposed research encompasses molecular studies aimed at deciphering the mechanisms of iron absorption and transport; how these processes are regulated; and clinical studies on patients diagnosed with haemochromatosis. The findings are particularly pertinent to the diagnosis, management and prevention of clinical haemochromatosis.Read moreRead less
Non-HFE Haemochromatosis In Australia: Natural History And Molecular Characterisation
Funder
National Health and Medical Research Council
Funding Amount
$179,948.00
Summary
Hereditary haemochromatosis (HH) is a disorder characterised by excessive iron absorption and build up of iron in body organs such as the liver. The excess iron can be toxic and cause disease. Most HH is caused by mutations in the HFE gene. Other forms are caused by mutations in other genes. This project will characterise a new form of HH that is unrelated to any of the previously known genes. The project aims to find the gene for this new condition by genetic analysis in a large family.
Dissecting The TMPRSS6 Regulation Of Iron Homeostasis
Funder
National Health and Medical Research Council
Funding Amount
$613,311.00
Summary
Iron overload and anaemia are two of the most significant health problems affecting humans. Understanding how the body regulates iron levels is key to our understanding of these disorders and to the future development of new therapies. This research is aimed at understanding how a hormone produced in the liver called hepcidin that maintains iron balance is regulated. This research may lead to novel therapies aimed at correcting the iron balance in conditions of iron overload or anaemia
One of the current challenges in public health is to translate the progress from the Human Genome Project into reduced morbidity and mortality from disease. Once genetic defects are characterised, knowledge about the variability in severity of disease in mutation carriers, is important from a public health perspective. Hereditary Haemochromatosis (HH) is a common genetic disorder of iron overload that results in a wide spectrum of disease, varying from non-specific symptoms to severe damage to l ....One of the current challenges in public health is to translate the progress from the Human Genome Project into reduced morbidity and mortality from disease. Once genetic defects are characterised, knowledge about the variability in severity of disease in mutation carriers, is important from a public health perspective. Hereditary Haemochromatosis (HH) is a common genetic disorder of iron overload that results in a wide spectrum of disease, varying from non-specific symptoms to severe damage to liver, heart, pancreas and joints from iron deposition. It is easily treatable by regular blood donation, and population-based screening for HH has therefore been advocated. In this study we aim to address gaps in the existing data on HH regarding dietary and lifestyle factors that contribute to the variable clinical picture of HH. The study will be based on the Melbourne Collaborative Cohort Study, a cohort of 31,500 men and women who have been followed for approximately 10 years. Information on dietary and lifestyle factors was collected at initial enrollment, along with a blood specimen. We will test all non-Southern European participants (31,176) for the common HH mutations in the HFE gene and then select a subgroup of 1150 people, including all people with the main genetic defect as well as a comparison group, for further clinical followup. Participants will have genetic counselling and informed consent will be obtained. Participants will complete a short questionnaire and give a blood sample for measurement of iron overload, liver function, and other relevant blood tests, then undergo a brief clinical examination. Results of all tests will be given at a followup visit by genetic counsellor or physician. This study will provide important data on natural history of HH risk factors that influence variability in clinical presentation and the association of HFE mutations with chronic diseases and all cause mortality.Read moreRead less
Assessment Of Oxidant Stress And Mitochondrial Dysfunction In Young Adults With Iron Loading Diseases
Funder
National Health and Medical Research Council
Funding Amount
$601,979.00
Summary
Disorders of iron metabolism are particularly prevalent in Australia and the consequences of excess iron can be severe. Liver disease is frequently associated with iron loading. The commonest form of iron loading can be treated readily, but it is unclear when the first signs of tissue damage occur and thus at what stage treatment should commence. This project will examine in detail the relationship between body iron levels and signs of tissue damage in young subjects with iron loading disease.
Mitochondrial Iron Overload And Friedreich's Ataxia: The Role Of Frataxin In Iron And Haem Metabolism
Funder
National Health and Medical Research Council
Funding Amount
$285,990.00
Summary
Friedreich's ataxia (FA) is due to the lack of a protein known as frataxin. Recent studies using Baker's yeast have shown that the deletion of frataxin results in the accumulation of toxic iron in the mitochondrion. More recently, a variety of studies have shown that FA patients have iron loading within their cells. The iron build-up may cause severe damage. At present, the role of frataxin in mammalian mitochondrial iron metabolism is unknown. Our preliminary studies demonstrate that frataxin i ....Friedreich's ataxia (FA) is due to the lack of a protein known as frataxin. Recent studies using Baker's yeast have shown that the deletion of frataxin results in the accumulation of toxic iron in the mitochondrion. More recently, a variety of studies have shown that FA patients have iron loading within their cells. The iron build-up may cause severe damage. At present, the role of frataxin in mammalian mitochondrial iron metabolism is unknown. Our preliminary studies demonstrate that frataxin is down-regulated by either erythroid differentiation or the haem precursor protoporphyrin IX (Becker and Richardson, submitted). These data strongly suggest a role for frataxin in iron metabolism. In the present study we will continue to assess if frataxin plays a role in the way cells handle iron. Using a unique model of mitochondrial iron overload developed in my lab (Richardson et al. (1996) BLOOD 87:3477), we will extensively investigate the iron metabolism of the mitochondrion in order to determine the function of frataxin and its role in Friedreich's ataxia. In addition, we have developed a series of new drugs known as iron chelators that can enter the mitochondrion due to their high lipid solubility (Becker and Richardson 1999 J. Lab. Clin. Med. 134:510). These latter drugs are far more effective than the chelator currently used to treat iron overload, desferrioxamine (DFO). Indeed, our chelators have been designed to result in high iron chelation efficacy but low toxicity (see Becker and Richardson, 1999). This exciting research may be crucial in understanding the development of FA and in creating new therapies such as the use of iron chelators.Read moreRead less
Iron-Infection Interactions: Studies Of The Link Between Iron Metabolism And Infectious Diseases Of Global Significance
Funder
National Health and Medical Research Council
Funding Amount
$383,244.00
Summary
Anaemia, malaria and HIV affect millions of people worldwide, but interactions between these conditions are poorly understood. A haematologist with training in public health, my interest is in finding ways to control the enormous global burden of anaemia. My research will focus on how iron status influences infection with malaria and HIV. It will provide evidence for anaemia control guidelines and help improve global policies for controlling iron deficiency where these infections coexist.
EXAMINING THE RELATIONSHIP BETWEEN MATRIPTASE-2 AND HEMOJUVELIN, TWO ESSENTIAL REGULATORS OF IRON HOMEOSTASIS
Funder
National Health and Medical Research Council
Funding Amount
$533,541.00
Summary
The control of iron levels is important in health and well being. Too little can lead to iron deficiency and anaemia, conversly too much can lead to haemochromatosis and tissue damage. We will examine the role of two proteins, matriptase-2 and hemojuvelin that when mutated cause iron deficiency or iron overload respectively. We will study how these proteins interact and work in opposite directions to control iron levels. The results will help to develop new therapeutics for iron disorders.
Targeting Iron Piracy From Host Proteins By Neisseria And Haemophilus Spp. For The Development Of Novel Antimicrobials
Funder
National Health and Medical Research Council
Funding Amount
$645,205.00
Summary
The bacteria that cause the sexually transmitted infection gonorrhoea and meningococcal disease are a serious health concern. In order to cause disease, these bacteria must obtain the nutrient iron from our bodies. This proposed research will use cutting edge technologies to understand on a molecular level how these bacteria obtain iron during infection. It will then apply this knowledge to develop molecules that prevent these bacteria from obtaining iron, as a means of treating these diseases.