Quantification Of Antigen Presentation To CD8 T Cells During Virus Infection
Funder
National Health and Medical Research Council
Funding Amount
$582,072.00
Summary
Knowledge of how virus-infected cells are detected by the bodyÍs immune system is fundamental to our understanding of virus infections and attempts to improve vaccines. We know that many proteins are displayed during virus infection but until now, the precise details of this display have only been worked out for very few proteins, studied one at a time. In this project we will apply cutting-edge technology to gain the first holistic view of how a virus-infected cell looks to the immune system.
Contribution Of Dendritic Cell Paralysis To The Immunosuppression Associated With Systemic Infections
Funder
National Health and Medical Research Council
Funding Amount
$490,051.00
Summary
The immune system fights viruses and other infections mobilising antibody-producing B cells and killer T cells. The B cells and killer T cells are recruited by specialysed cell of the immune system called Dendritic Cells (DC). The DC are distributed all over the body, where they play an immunosurveillance role: they constantly monitor their sorroundings for the presence of pathogens. When DC detect these pathogens they become activated . They capture the pathogen, break it into small pieces call ....The immune system fights viruses and other infections mobilising antibody-producing B cells and killer T cells. The B cells and killer T cells are recruited by specialysed cell of the immune system called Dendritic Cells (DC). The DC are distributed all over the body, where they play an immunosurveillance role: they constantly monitor their sorroundings for the presence of pathogens. When DC detect these pathogens they become activated . They capture the pathogen, break it into small pieces called antigens, and display these antigens on their surface, where they can be seen by helper T cells, which in turn mobilise the B cells, and by killer T cells. This chain of reactions initiates an immune response. The DC undergo profound changes after they detect pathogens. They stop monitoring their sorroundings, and concentrate on displaying to T cells the antigens that belonged to the pathogen that triggered their initial activation. Indeed, they do not respond to new pathogen encounters. In normal conditions few DC are activated by each pathogen encounter, so there are always enough DC ready to respond to new infections. However, there are situation that activate nearly all the DC at the same time. This can happen during sepsis (bacterial infection of the blood) and malaria. It has been recognised for a long time that these two conditions can be immunosuppressive they shut-down the immune system. Our previous work has demonstrated that this is in part due to the excessive number of DC that sepsis or malaria activate, leaving no more DC capable of responding to subsequent infections. This work has focused on the immediate effects of sepsis or malaria -within the first 24 hours or so; now we want to investigate the efffect of these conditions on the reconstitution of the DC network. We think this will help us to find treatments to restore immunocompetence a functional immune system- in sepsis or malaria patients.Read moreRead less
A Proteome-wide Approach To Anti-viral Immunity And Vaccine Development
Funder
National Health and Medical Research Council
Funding Amount
$622,655.00
Summary
We know that many parts of viruses are displayed to the immune system, but at present the exact fragments are difficult to predict, we do not know all the genes in our bodies that control this process and we also need better methods to study the way some viruses (e.g. the cold sore virus) avoid detection. This project will study these problems with the overall goal of improving vaccine design, understanding immune deficiency and how viruses fight back against our immune system.
Priming, Recruitment And Retention Of Influenza Virus Specific CD8 T Cells In The Upper Airways
Funder
National Health and Medical Research Council
Funding Amount
$633,371.00
Summary
Influenza virus gains entry into the body by inhalation and initiates its replication cycle within the upper airways. This early stage of infection, when the amount of influenza virus is low, provides the ideal window of opportunity for an effective immune response to limit disease progression. In this proposal we will define the immunity that can be evoked within the upper airways and determine immune mechanisms left behind that can safeguard this region from this important respiratory pathogen
We know that many parts of viruses are displayed to the immune system, but infection can also result in the display of fragments of our body's own proteins (self-peptides). We will apply cutting-edge technology to find all the virus- and self-peptides that are recognised by the immune system during infection with a vaccine virus and influenza virus. This will help us understand how the body fights infection and perhaps why infection can sometimes start autoimmune diseases.