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Copper And Its Antibacterial Action: An Emerging Aspect Of Host Defence Against Bacterial Pathogens
Funder
National Health and Medical Research Council
Funding Amount
$454,858.00
Summary
This project will determine the way in which copper is used as an antimicrobial agent to kill Salmonella that reside inside the macrophage (white blood cell) of the host and also determine how Salmonella defends against copper-dependent killing. It will also determine the role of copper in the killing of extra-intestinal pathogens during sepsis. These results will provide information that can be used to manage and control infections intracellular and extracellular bacterial pathogens.
Role Of Regulatory Genes In The Gastrointestinal Pathogen, Clostridium Difficile
Funder
National Health and Medical Research Council
Funding Amount
$287,036.00
Summary
When patients are treated in hospital with antibiotics they sometimes develop chronic diarrhoea or colitis syndromes that are very difficult and expensive to treat. This project involves the analysis of the bacterium that generally causes these gastrointestinal diseases. We know that this microorganism is present in the hospital environment and that it produces potent protein toxins that are responsible for these diseases but we know little about the actual disease process. In most bacteria that ....When patients are treated in hospital with antibiotics they sometimes develop chronic diarrhoea or colitis syndromes that are very difficult and expensive to treat. This project involves the analysis of the bacterium that generally causes these gastrointestinal diseases. We know that this microorganism is present in the hospital environment and that it produces potent protein toxins that are responsible for these diseases but we know little about the actual disease process. In most bacteria that cause disease there are regulatory networks that control the expression of the genes responsible for the disease process. In this project, we aim to develop an understanding of how these regulatory networks operate in this particular bacterium. The latest techniques of molecular biology will be used to investigate several specific regulatory genes at the functional level. Since the entire DNA sequence of this bacterium is now known we will also use a broader research approach that makes use of this knowledge to examine all of potential regulatory networks that exist in this bacterium. Finally, we will develop new methods for the genetic analysis of the causative bacterium so that we will be better able to elucidate the role of specific genes in the disease process. By understanding how this bacterium controls the production of the proteins that interact with human intestinal cells to cause disease we hope to be able to prevent such diseases from occurring. The successful completion of the project therefore will make a major contribution to the development of improved methods for the control and treatment of these chromic diarrhoea and colitis syndromes.Read moreRead less
Investigating The Interface Between Host Innate Immune Cells And A Fungal Pathogen
Funder
National Health and Medical Research Council
Funding Amount
$578,085.00
Summary
Fungi which infect humans are a major health problem, especially for those with compromised immune systems (eg. AIDS, transplant and cancer patients). These fungi cause disease by evading the immune system whilst deriving nutrients for growth. Some fungi evade the immune system by residing within host cells; a hostile and nutrient poor environment. This project will study a pathway that we have shown is required for growth inside host cells. This knowledge will open new avenues for treatment.
Molecular Mechanisms Of Intracellular Growth, Survival And Pathogenicity
Funder
National Health and Medical Research Council
Funding Amount
$335,816.00
Summary
Fungi which infect humans are a major health problem, especially for those with compromised immune systems (eg. AIDS, transplant and cancer patients). These fungi cause disease by evading the immune system whilst deriving nutrients for growth. Some fungi evade the immune system by residing within host cells; a hostile and nutrient poor environment. This project will study a pathway that we have shown is required for growth inside host cells. This knowledge will open new avenues for treatment.
Development Of Novel Antibacterial Compounds From Subtilosin A
Funder
National Health and Medical Research Council
Funding Amount
$490,724.00
Summary
We aim to overcome a problem that is not being addressed by pharmaceutical companies- i.e., there is an urgent need to develop new classes of antibacterial drugs because of the increasing prevalence of drug resistant bacteria. We will combine genetics, structural biology and chemistry to develop a new class of anti-bacterial drug based on a naturally occurring microbial molecule that is novel in structure and very stable- attributes that make it very different to existing therapeutic approaches.
Antibiotic resistance increases mortality and costs in the Intensive Care Unit (ICU), but the impact of antibiotic therapy has not been adequately studied. We propose to characterise the behaviour of key elements of the bacterial microflora (resistant bacteria and major resistance genes) in response to antibiotics. We have developed new rapid diagnostics to harness these data and this proposal has the potential to greatly improve diagnostic speed and accuracy and thus clinical outcomes.
Biology Of The Novel C-type Lectin Receptor DCL-1 In Innate And Adaptive Immune Response
Funder
National Health and Medical Research Council
Funding Amount
$439,500.00
Summary
The innate immune system is the first line of defense in protecting the body from infection. Phagocytic (meaning eating) white blood cells, which include dendritic cells and macrophages are equipped with cell surface proteins These bind the many types of microbes that cause infection, allowing the phagocytes to destroy them (innate immune response). Furthermore, dendritic cells and macrophages have mechanisms to activate additional specific responses (adaptive immune response) mediated by lympho ....The innate immune system is the first line of defense in protecting the body from infection. Phagocytic (meaning eating) white blood cells, which include dendritic cells and macrophages are equipped with cell surface proteins These bind the many types of microbes that cause infection, allowing the phagocytes to destroy them (innate immune response). Furthermore, dendritic cells and macrophages have mechanisms to activate additional specific responses (adaptive immune response) mediated by lymphocytes (T and B cells). We have discovered a cell surface protein, termed DCL-1, which may play a role in uptake of microbes by phagocytes and activation of innate and adaptive immune responses. This project will examine the mechanisms whereby DCL-1 mediates these immune responses. Understanding the mechanism may allow us to exploit DCL-1 for tumor immunotherapy.Read moreRead less
THE ROLE OF MONOCYTIC LINEAGE CELLS IN MODELS OF CORNEAL DISEASE
Funder
National Health and Medical Research Council
Funding Amount
$311,567.00
Summary
Vision relies on sharp, focused undistorted images passing through the cornea, the clear 'window' at the front of the eye. Corneal disease causes over 5 million cases of blindness worldwide. In patients who damage the delicate covering of the cornea, due to trauma or contact lens wear, there is an increased risk of infection that may lead to blindness. This project will study the ways in which immune cells in the cornea detect invasion by potential pathogens.
The Role Of Fatty Acid Metabolism In Pathogenicity.
Funder
National Health and Medical Research Council
Funding Amount
$540,075.00
Summary
Fungi which infect humans are a major health problem, especially for those with compromised immune systems (eg. AIDS, transplant and cancer patients). Pathogenic fungi must evade the host s immune system whilst deriving nutrients for growth. Some fungi evade the immune system by residing within host cells. This poses significant challenges to growth due to the nutrient poor environment. By understanding how these fungi adapt to growth inside host cells, new avenues for treatment will emerge.
The rapid emergence and spread of antibiotic resistance in bacteria that cause infectious diseases is of major concern to public health authorities throughout the world. Many of the genes that are responsible for this resistance are carried on mobile genetic elements, which are discrete segments of genetic material that can move from one bacterium to another. These genetic elements are important vehicles for the transmission of virulence and antibiotic resistance genes in most bacteria. This pro ....The rapid emergence and spread of antibiotic resistance in bacteria that cause infectious diseases is of major concern to public health authorities throughout the world. Many of the genes that are responsible for this resistance are carried on mobile genetic elements, which are discrete segments of genetic material that can move from one bacterium to another. These genetic elements are important vehicles for the transmission of virulence and antibiotic resistance genes in most bacteria. This project is centred on bacteria that cause intestinal diseases and have the potential to transfer genetic information to other bacteria that are present in the intestine. The focus will be on elucidating the mechanism of action of an enzyme encoded by two of these genetic elements. This enzyme is responsible for the movement of these elements from one site in the bacterial genome to another, by a process that is being increasingly recognised as important in antibiotic-resistant disease-causing bacteria. The project will employ the latest tools of molecular biology to determine the function of this enzyme, and its associated genetic elements, at the detailed molecular level. These studies will contribute to our understanding of how these antibiotic resistance elements are transferred within and between different bacterial cells. In the longer term the project will contribute towards the development of improved methods for the control and treatment of infectious diseases.Read moreRead less