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Initiating Events In The Development Of Allergic Airway Inflammation
Funder
National Health and Medical Research Council
Funding Amount
$452,545.00
Summary
Despite recent advances we still do not understand the basic mechanisms which underlie the development of allergic airway inflammatory diseases such as rhinitis and asthma. It has been previously shown that when pollen are exposed to water they release a large number of very small starch granules which contain a number of potent allergens as well as plant steroids. In addition house dust mite allergens which are strongly associated with asthma are mostly located in small faecal pellets. Both the ....Despite recent advances we still do not understand the basic mechanisms which underlie the development of allergic airway inflammatory diseases such as rhinitis and asthma. It has been previously shown that when pollen are exposed to water they release a large number of very small starch granules which contain a number of potent allergens as well as plant steroids. In addition house dust mite allergens which are strongly associated with asthma are mostly located in small faecal pellets. Both these particles are ideally sized to enter the respiratory tract and initiate inflammatory responses. We have shown that these responses appear to be of the type that is needed to initiate allergic reactions. We intend to further study the interactions of these small inhaled allergen containing particles with cells of the respiratory tract. In this proposal we will look at both alveolar macrophages and respiratory epithelial cells. These approaches will not only provide new information about the processes of airway inflammation caused by allergens but may also define new therapeutic approaches to the treatment of these diseases.Read moreRead less
Fetomaternal Immunological Interactions In The Aetiology Of Allergic Disease.
Funder
National Health and Medical Research Council
Funding Amount
$195,990.00
Summary
There is accumulating evidence that immune abnormalities that lead to allergy are present at birth, and may be linked with maternal factors in pregnancy. This study examines how immune interactions between the fetus and the mother during pregnancy predispose to allergic immune responses in the infant. Allergic diseases result from inappropriate Type 2 responses to the environment whereas Type 1 response dominate immune responses of nonallergic people. Type 2 immune responses are first initiated ....There is accumulating evidence that immune abnormalities that lead to allergy are present at birth, and may be linked with maternal factors in pregnancy. This study examines how immune interactions between the fetus and the mother during pregnancy predispose to allergic immune responses in the infant. Allergic diseases result from inappropriate Type 2 responses to the environment whereas Type 1 response dominate immune responses of nonallergic people. Type 2 immune responses are first initiated before birth when they are actually normal for fetal survival. In normal infants maturation of Type 1 immune responses plays a central role in switching off the Type 2 responses of fetal life. Allergic disease appears to be due to abnormal persistence of this Type 2 response pattern beyond the newborn period. One of the most striking abnormalities in allergic individuals is immature Type 1 function at birth. With rising rates of allergy, there is an urgent need to identify how the balance of Type 1 and Type 2 responses is regulated during this early period. Maternal factors appear to play a critical role. There is already evidence that Type 1 responses are lower in babies of allergic mothers compared to babies of allergic fathers, suggesting direct effects of the mother in pregnancy. Although pregnancy normally favours Type 2 immunity, there appears to be normal variation in the balance of Type 1 and Type 2 responses in pregnancy. We plan to determine if variations in this balance affect the fetal capacity for Type 1 responses. We propose that minor degrees of tissue mismatch (present in all pregnancies) will activate low grade Type 1 responses and enhance maturation of fetal Type 1 responses. We will determine if allergic mothers (prone to stronger Type 2 responses) have less developed Type 1 responses in pregnancy and if this plays a direct role in abnormal Type 1 responses observed in their babies.Read moreRead less
Mast Cell Proteases Suppress Respiratory Viral Infections And Alleric Inflammation Of The Airways
Funder
National Health and Medical Research Council
Funding Amount
$665,532.00
Summary
Severe RSV infection and asthma accounts for poor quality of life in our community and current treatments have limited effects. Although the factors regulating these disorders are poorly understood, mast cells (MCs) may play important roles. We have shown MC protease-6 protects against viral infection. Here we will identify how MC and their factors are involved in the control of severe respiratory infections and allergic disease of the lung, and identify potential new ways to treat these conditi ....Severe RSV infection and asthma accounts for poor quality of life in our community and current treatments have limited effects. Although the factors regulating these disorders are poorly understood, mast cells (MCs) may play important roles. We have shown MC protease-6 protects against viral infection. Here we will identify how MC and their factors are involved in the control of severe respiratory infections and allergic disease of the lung, and identify potential new ways to treat these conditions.Read moreRead less
Targeting MicroRNA (miRNA) As A Unified Therapeutic Approach To The Treatment Of Asthma And Allergic Inflammation
Funder
National Health and Medical Research Council
Funding Amount
$675,030.00
Summary
Approximately 30% of our community suffers from allergic inflammation (asthma/rhinitis/dermatitis) that results in poor quality of life. The factors regulating these disorders are poorly understood and current treatments only target the symptoms and not the cause of disease. MicroRNA control gene expression and are emerging as potential regulators of inflammation. This project will identify the role of microRNA in the regulation of allergic diseases and their potential as new therapeutic targets ....Approximately 30% of our community suffers from allergic inflammation (asthma/rhinitis/dermatitis) that results in poor quality of life. The factors regulating these disorders are poorly understood and current treatments only target the symptoms and not the cause of disease. MicroRNA control gene expression and are emerging as potential regulators of inflammation. This project will identify the role of microRNA in the regulation of allergic diseases and their potential as new therapeutic targets.Read moreRead less
Expression And Function Of Fatty Acid Binding Proteins In Asthmatic Airway Epithelium
Funder
National Health and Medical Research Council
Funding Amount
$226,500.00
Summary
Asthma is an inflammatory disease of the lungs that affects over 10% of all Australians. It ranges in severity from mild to life-threatening. Although a number of drugs are currently available for the treatment of asthma, there are many people whose asthma does not respond very well to treatment. We have recently identified a gene called aP2 that is important in the development of asthma. Drugs targeted against this gene may be very useful in the treatment of asthma. In this project, we aim to u ....Asthma is an inflammatory disease of the lungs that affects over 10% of all Australians. It ranges in severity from mild to life-threatening. Although a number of drugs are currently available for the treatment of asthma, there are many people whose asthma does not respond very well to treatment. We have recently identified a gene called aP2 that is important in the development of asthma. Drugs targeted against this gene may be very useful in the treatment of asthma. In this project, we aim to understand how aP2 is turned on during asthma, and how it contributes to disease development. This information will be essential for designing optimal strategies for drug targeting of the aP2 pathway in asthma.Read moreRead less
Effects Of Enteric Microflora On Mucosal And Systemic Immune Development In Infants At Risk Of Allergic Disease
Funder
National Health and Medical Research Council
Funding Amount
$219,750.00
Summary
The increase in allergic diseases over the last 20-30 years has been attributed to an increased immunological propensity to Type-2 allergic immune responses in the postnatal period. It has been proposed that this may be due to a relative deficiency of counter-regulatory Type 1 immune responses in early life. Thus, there is growing interest in factors that might affect Type 1 maturation in this early period. It has been proposed that progressively cleaner societies may have more allergies because ....The increase in allergic diseases over the last 20-30 years has been attributed to an increased immunological propensity to Type-2 allergic immune responses in the postnatal period. It has been proposed that this may be due to a relative deficiency of counter-regulatory Type 1 immune responses in early life. Thus, there is growing interest in factors that might affect Type 1 maturation in this early period. It has been proposed that progressively cleaner societies may have more allergies because there is less stimulation of the Type 1 responses during immune development. Bacterial products provide important maturation signals to the developing immune system, and may favour Type 1 responses. The largest early exposure to bacteria in occurs in the human gut, which is colonised with bacteria soon after birth. These bacteria play an important role in maintaining health, both in the protection from harmful bacteria, and in the development of food tolerance. There is evidence that infants in cleaner sociaeties may have alterations in bowel flora. For many years probiotic formulations (containing strains of these healthy bacteria) have been used safely to treat children with gastroenteritis to reduce the duration of diarrhoea. More recently it has been suggested that these formulations have a role in treating and even preventing allergic disease. Further research is needed to confirm this, and to define the underlying immunological processes. This randomised double blind control study will determine if supplementation with probiotic flora (in late pregnancy and in early infancy) can favourably influence gut colonisation, alter subsequent immune development, and help prevent allergic disease in infants at high risk (from allergic families).Read moreRead less
Inhibition Of Allergic Airway Inflammation By Nanoparticles
Funder
National Health and Medical Research Council
Funding Amount
$540,075.00
Summary
Inhaled air pollution particulate matter causes asthma exacerbations, with 'ultrafine' nanoparticles thought to play a major role. Unexpectedly, we recently found that, by contrast, administration of inert ultrafine nanoparticles prevents allergic airway inflammation. We will identify the key particle physical and chemical properties associated with this novel type of disease inhibition, study particle effects in clinically-relevant disease models and identify mechanisms of action.
Airway Inflammation In Allergic Aspergillosis: Characterisation, Immunologic Mechanisms And Treatment.
Funder
National Health and Medical Research Council
Funding Amount
$242,562.00
Summary
Aspergillus fumigatus is a fungus that commonly occurs in our community. In some people with asthma, this fungus causes the asthma to become severe and chronic. It may also be associated with a severe form of lung destruction called bronchiectasis. There is little known about the chemicals produced by the body which contribute to inflammation in this condition. Similarly, it is not known why only some people with asthma develop an allergic disease to this fungus. In this project we will examine ....Aspergillus fumigatus is a fungus that commonly occurs in our community. In some people with asthma, this fungus causes the asthma to become severe and chronic. It may also be associated with a severe form of lung destruction called bronchiectasis. There is little known about the chemicals produced by the body which contribute to inflammation in this condition. Similarly, it is not known why only some people with asthma develop an allergic disease to this fungus. In this project we will examine 2 important inflammation chemicals (called cytokines) to examine what their role is in aspergillus associated allergy. We will also examine 2 genetic markers to establish whether these predispose to people developing allergy to aspergillus. The treatment of aspergillus lung disease is also problematic. In this project we will examine whether a new medication called itraconazole is effective in removing this fungus from the airway and improving asthma.Read moreRead less
Mechanisms Of Nanoparticle-mediated Inhibition Of Asthma
Funder
National Health and Medical Research Council
Funding Amount
$637,921.00
Summary
Ultrafine pollution particles may promote asthma, and there is concern that man-made 'nanoparticles' have a similar effect. Surprisingly, we found that inert toxin-free nanoparticles inhibit asthma. We propose nanoparticles do this by leaving a unique �imprint� in the lung. We will explore how this imprint modifies lung inflammatory and immune regulatory cell function, and investigate particles made from advanced biodegradable polymers as potential therapeutics for inflammatory lung diseases suc ....Ultrafine pollution particles may promote asthma, and there is concern that man-made 'nanoparticles' have a similar effect. Surprisingly, we found that inert toxin-free nanoparticles inhibit asthma. We propose nanoparticles do this by leaving a unique �imprint� in the lung. We will explore how this imprint modifies lung inflammatory and immune regulatory cell function, and investigate particles made from advanced biodegradable polymers as potential therapeutics for inflammatory lung diseases such as asthma.Read moreRead less
Australia has one of the highest asthma rates in the world. In this project we will study how natural regulatory T cells suppress asthma in a mouse model. We will determine where and when interactions between regulatory T cells and allergic T cells occur, and define the mechanisms used by regulatory cells to mediate their suppressive effects. Our findings will aid in understanding why asthma develops and how it may be controlled by the immune system itself.