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Developmental And Cellular Mechanisms Involved In The Pathological Changes To The Epithelium In Asthma.
Funder
National Health and Medical Research Council
Funding Amount
$263,500.00
Summary
A consensus has developed in recent years that asthma involves chronic airway inflammation superimposed upon a background of airway remodelling. If untreated, these processes result in increased airway responsiveness, variable airflow obstruction and ultimately a progressive decline in lung function). Recently the role of the epithelium in the pathogenesis of asthma has been emphasised based upon observations indicating that the epithelium can play an important role in airway inflammation and re ....A consensus has developed in recent years that asthma involves chronic airway inflammation superimposed upon a background of airway remodelling. If untreated, these processes result in increased airway responsiveness, variable airflow obstruction and ultimately a progressive decline in lung function). Recently the role of the epithelium in the pathogenesis of asthma has been emphasised based upon observations indicating that the epithelium can play an important role in airway inflammation and remodelling. However, this paradigm has been developed using data accumulated almost exclusively from studies in adults. Epidemiological studies suggest that airway remodelling might play a less significant role in the majority of childhood asthma since most children with asthma have relatively minor symptoms, minimal disruption of lung function and tend not to have symptoms that persist into adulthood. Clearly the relative importance of inflammation and remodelling and the regulatory mechanisms involved are important factors to understand particularly if new, effective prevention and therapeutic strategies are to be developed. For the first time in children, the proposed project will allow the study of asthma mechanisms using target organ tissue (airway epithelium) from a large unselected population. Primary cell samples recovered by bronchial brushing will be analysed separately and also cultured in order to investigate critical elements of the pathogenesis of asthma. Data collected from symptomatic children can be easily compared with that from healthy controls and also with data from adults to determine age related factors that contribute to asthma. Furthermore, the establishment of a repository of cultured epithelial cells from these children will provide a unique resource that will allow future collaborations with scientists studying a variety of mechanisms in asthma and with the pharmaceutical industry.Read moreRead less
Asthma causes wheeze and shortness of breath via airway narrowing, with asthma attacks commonly caused by virus infections. We plan to investigate how airway narrowing during an asthma attack decreases the body’s ability to fight off a viral infection, causing prolonged infection, worse asthma symptoms, more airway inflammation and long-term damage within the airways. We will attempt to use current and novel treatments to reverse these problems, and improve treatment for asthma.
While many cases of asthma are mild, severe cases require extensive health care resources and are virtually unresponsive to conventional treatment. This project will investigate whether specific compounds released from the airway are able to cause lung damage and airway abnormalities similar to that in severe asthma. We will investigate whether these changes are responsive to conventional therapy and investigate a potential treatment for regaining this responsiveness in severe asthma.
Integrin-growth Factor Interactions In The Development Of Airway Wall Remodelling
Funder
National Health and Medical Research Council
Funding Amount
$405,300.00
Summary
Asthma is a clinically and socio-economically important disease with prevalence in the Australian population of approximately 13% for adults and approaching 25% for children. Currently, glucocorticoids (GCS) are first line prophylactic therapy for the disease. Despite a wide diversity of precipitating factors, the mechanisms underlying its pathogenesis remain unclear. A marked thickening of the airway wall bought about by excessive deposition of extracellular matrix is a prominent pathological f ....Asthma is a clinically and socio-economically important disease with prevalence in the Australian population of approximately 13% for adults and approaching 25% for children. Currently, glucocorticoids (GCS) are first line prophylactic therapy for the disease. Despite a wide diversity of precipitating factors, the mechanisms underlying its pathogenesis remain unclear. A marked thickening of the airway wall bought about by excessive deposition of extracellular matrix is a prominent pathological feature but why this occurs and how it can be prevented is equally unclear. Recent studies have suggested that interactions between cells and the extracellular matrix influence the airways response to inflammation and modulate the effectiveness of currently available therapies. Indeed, there is mounting evidence to suggest that GCS fail to modulate and indeed in some cases even contribute to structural changes in the remodeled airway wall. The aim of this study is to assess the mechanisms by which cells and the extracellular matrix interact to promote remodelling of the airway wall and to determine whether this association influences the responsiveness to traditional asthma therapies.Read moreRead less
Investigating The Effects Of Macrolides On Excessive Synthesis And Secretion Of Airway Mucins Using Novel Ex Vivo And In Vivo Approaches
Funder
National Health and Medical Research Council
Funding Amount
$520,821.00
Summary
Many people have difficulty breathing because the airway tubes that move air in and out of their lungs are blocked by excessive amounts of sticky mucus. Our project will use new techniques developed in our laboratories to investigate whether a group of medicines called “macrolides” can prevent the excessive production and release of mucus in the airways, and thus be beneficial in treating asthma, and potentially other lung diseases.
Inhibition Of Necroptosis As A Novel Strategy For The Prevention Of Bronchiolitis And Subsequent Asthma
Funder
National Health and Medical Research Council
Funding Amount
$658,015.00
Summary
Severe virus associated bronchiolitis is a major cause of infant mortality and a risk factor for asthma. Using a mouse model, we have shown that virus infection causes tissue damage, leading to the release of 'danger' molecules that promote excessive inflammation and tissue remodelling. We have identified an important mechanism by which the danger molecules are released. We will now assess whether blocking this process ameliorates viral bronchiolitis and breaks its nexus with subsequent asthma.
The Role Of Glutathione Transferase P1 In Regulating Allergic Airways Disease
Funder
National Health and Medical Research Council
Funding Amount
$436,882.00
Summary
Recent studies have shown that a single amino acid change in an enzyme called glutathione tranferase Pi (GSTP)1 protects against the likelihood of developing asthma. This enzyme is found in the cells that line the airways and detoxifies harmful chemicals such as those found in pollutants and cigarette smoke. The aim of our study is to understand how GSTP1 protects against the development of asthma.
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