Mechanisms Of Intestinal And Systemic Iron Homeostasis In Early Infancy
Funder
National Health and Medical Research Council
Funding Amount
$485,835.00
Summary
Iron is essential trace element for normal health. Iron requirements are particularly high during early postnatal life to meet the needs of the growing infant. To accommodate these needs, intestinal iron absorption is extremely high at this time. We have previously shown that the iron absorption mechanism during suckling differs from that in adults and this project explores that mechanism in more detail. These studies have important implications for infant nutrition and dietary supplementation.
A Dietary Intervention For Sarcopenia In Cirrhosis
Funder
National Health and Medical Research Council
Funding Amount
$128,224.00
Summary
Patients with chronic liver failure, or cirrhosis, suffer many complications. Sarcopenia, the loss of muscle and muscle weakness, is one of these. It is associated with reduced survival. Patients with cirrhosis have low levels of branched chain amino acids (BCAAs) which are used as building blocks for protein and energy in muscle. We aim to explore how oral supplements of BCAAs might improve muscle in this population. If this improves muscle mass, we also expect it may improve other outcomes.
The Potential Benefit Of Resistant Starch On Zinc Retention And Its Potential For Utilisation In Infants At Risk Of Zinc Deficiency.
Funder
National Health and Medical Research Council
Funding Amount
$101,991.00
Summary
Resistant starch (RS) can promote absorption of minerals such as calcium and magnesium from the large intestine. As zinc deficiency in children from the developing world remains a major public health issue, we will use a rodent model to determine if RS can improve zinc absorption in growing rats with preceeding zinc deficiency. In parallel we will also determine whether infants, who are most vulnerable to the effects of zinc deficiency, have the gut bacteria required to utilise the potential and ....Resistant starch (RS) can promote absorption of minerals such as calcium and magnesium from the large intestine. As zinc deficiency in children from the developing world remains a major public health issue, we will use a rodent model to determine if RS can improve zinc absorption in growing rats with preceeding zinc deficiency. In parallel we will also determine whether infants, who are most vulnerable to the effects of zinc deficiency, have the gut bacteria required to utilise the potential and known health benefits of RS.Read moreRead less
A Novel Nanoparticulate Iron Supplement And Its Effect On The Gastrointestinal Tract.
Funder
National Health and Medical Research Council
Funding Amount
$671,995.00
Summary
Iron deficiency and iron deficiency anaemia are major global health issues. Currently available iron supplements can lead to gastrointestinal side effects. We have developed a new type of oral iron supplement that (in animal studies) is as effective as conventional treatments, but without their limitations. In this project we will investigate the effect of this supplement on the gastrointestinal tract to ensure its safety and to provide preliminary data for future clinical trials in humans.
The Mechanism Of Intestinal Haem Iron Absorption And Characterization Of A Novel Haem-binding Protein
Funder
National Health and Medical Research Council
Funding Amount
$537,773.00
Summary
Iron is essential for normal health as many important proteins in the body require iron to function properly (e.g. haemoglobin). However, too much iron can be toxic, so the body must keep its iron content within defined limits. The amount of iron in the body is determined at the point of absorption from the diet in the small intestine. If too little iron is absorbed, then anaemia can result. If too much iron is absorbed, as is the case in the common disease haemochromatosis (with approximately 1 ....Iron is essential for normal health as many important proteins in the body require iron to function properly (e.g. haemoglobin). However, too much iron can be toxic, so the body must keep its iron content within defined limits. The amount of iron in the body is determined at the point of absorption from the diet in the small intestine. If too little iron is absorbed, then anaemia can result. If too much iron is absorbed, as is the case in the common disease haemochromatosis (with approximately 1 in 200 Australians at risk) then the body becomes iron loaded and various organs, particularly the liver, can become damaged. An understanding of how iron is absorbed will place us in a much better position to treat diseases such as this. Iron is present in the diet in two forms - inorganic iron and haem iron. Inorganic iron is the main form of iron in foods of plant origin while most haem iron comes from meat. In a typical diet 80-90% of the iron is inorganic iron and only 10-20% is haem. Despite this, 30-50% of the iron taken into the body comes from haem, so haem iron absorption is particularly efficient. While we have learned a great deal about the mechanims by which inorganic iron is absorbed in recent years, we know very little about the absorption of haem iron, so that is the focus of this project. We will study the pathway by which haem enters the body, how this process is regulated, and the characteristics of haem binding to the cells lining the small intestine. These cells are responsible for the uptake of all nutrients from the diet. In particular, we will examine the biology of a recently identified protein known as HCP1. Preliminary evidence suggests that HCP1 could be the main protein enabling haem to be taken up by intestinal cells. These studies will enhance our knowledge of an important nutritional pathway and improve our capacity to treat diseases such as haemochromatosis where iron absorption is defective.Read moreRead less
This proposal is aimed at improving the health of people with “Disorders of Iron Metabolism”. It focuses on the iron-related diseases hereditary haemochromatosis and colorectal cancer, as well as liver disease, chronic kidney disease and malnutrition. Outcomes from these studies are expected to identify how iron metabolism is impaired, the clinical consequences and new strategies for the prevention and treatment of iron-related diseases.
Iron is essential in the diet but it is also toxic when present in excess, so both iron deficiency and iron overload can have significant clinical consequences. I will investigate the basic mechanisms by which the body acquires iron and how iron can lead to toxicity. The goal of these studies is to provide more effective iron supplements and to improve diagnosis and treatment of iron-related diseases. Iron metabolism in pregnancy, infants and respiratory diseases will be a particular focus.
Discovery Early Career Researcher Award - Grant ID: DE120101807
Funder
Australian Research Council
Funding Amount
$375,000.00
Summary
Fat sensing in the oral cavity and gastrointestinal tract: role in the regulation of gastrointestinal function and energy intake in health and obesity. This project will determine whether a reduced capacity to sense, or taste, the presence of fats in the oral cavity and the gastrointestinal tract diminishes the effects of fat on those aspects of gut function that regulate appetite and suppress energy intake. The project will, accordingly, provide important insights into the pathophysiology of ob ....Fat sensing in the oral cavity and gastrointestinal tract: role in the regulation of gastrointestinal function and energy intake in health and obesity. This project will determine whether a reduced capacity to sense, or taste, the presence of fats in the oral cavity and the gastrointestinal tract diminishes the effects of fat on those aspects of gut function that regulate appetite and suppress energy intake. The project will, accordingly, provide important insights into the pathophysiology of obesity.Read moreRead less