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Effects Of Natural Sequence Variation On Evasion Of Cytotoxic T Lymphocytes By Murine Cytomegalovirus.
Funder
National Health and Medical Research Council
Funding Amount
$553,167.00
Summary
Human cytomegalovirus persists for the life time of an infected person. It has many ways of achieving this, including interfering with the host immune response. This project seeks to explore this using a mouse model and murine CMV. Specifically we will focus on a set of viral genes that inhibit host recognition of virally infected cells. Sequence variation in these genes suggests that they function differently in different strains of virus: we will examine the consequences of this variation.
Determinants Of Cytomegalovirus Salivary Gland Persistence
Funder
National Health and Medical Research Council
Funding Amount
$566,308.00
Summary
Human cytomegalovirus (HCMV) persists for extended periods in the salivary gland, an organ of viral transmission. It is not clear how the virus avoids immune mediated control in this tissue. This aspect of viral pathology will be assessed in a mouse model using two strains of murine CMV which exhibit marked differences in salivary gland persistence. The role of tissue tropism (inhibition of apoptosis), viral immune evasion and host immunity in salivary gland persistence will be studied.
Mechanisms Of Immune Modulation By Human Cytomegalovirus During The Latent Phase Of Infection
Funder
National Health and Medical Research Council
Funding Amount
$165,500.00
Summary
Human cytomegalovirus (CMV) is a herpesvirus which infects a majority of the population. CMV is a significant cause of serious, life-threatening disease in neonates and in people who are immunosuppressed. Bone marrow and solid organ transplant recipients are particularly at risk of developing serious CMV disease. CMV has the remarkable ability to hide in the body in a dormant or latent form for the life of the host. However, when conditions are right the virus can awaken (ie reactivate) from its ....Human cytomegalovirus (CMV) is a herpesvirus which infects a majority of the population. CMV is a significant cause of serious, life-threatening disease in neonates and in people who are immunosuppressed. Bone marrow and solid organ transplant recipients are particularly at risk of developing serious CMV disease. CMV has the remarkable ability to hide in the body in a dormant or latent form for the life of the host. However, when conditions are right the virus can awaken (ie reactivate) from its latent state, producing new infectious virus and disease. It is in immunosuppressed individuals such as transplant patients that reactivation from latency is of most medical significance, yet the latent phase of infection remains very poorly understood. We recently reported that during latent infection CMV interfered with the expression of a protein which plays a crucial role in our immune system. This protein is called MHC class II and its proper function is essential for our immune system to fight infections. Thus, we postulated that the ability of CMV to successfully hide in a cell in a latent state is at least partially due to its ability to interfere with the cells ability to properly make MHC class II proteins. This project aims to futher define and characterise the functions of latent CMV that enable it to interfere with our immune system. Firstly, we aim to continue with our studies to determine the mechanism by which latent CMV interferes with MHC class II expression. Secondly, we will seek to determine whether latent CMV interferes with any other important components of our immune system. Thirdly, we will seek to identify the precise viral gene that causes the interference with MHC class II expression. Determining the mechanism of immune system regulation and the viral gene(s) responsible for this interference may lead to the design of gene therapies to lessen the clinical impact of CMV disease in transplant recipients.Read moreRead less
Viral And Host Cell Gene Expression During The Establishment And Maintenance Phases Of Human Cytomegalovirus Latency
Funder
National Health and Medical Research Council
Funding Amount
$149,250.00
Summary
Human cytomegalovirus (CMV) is a herpesvirus which infects a majority of the population. HCMV is a significant cause of serious, life-threatening disease in neonates and in people who are immunosuppressed. Transplant recipients such as bone marrow, kidney and heart transplant patients are particularly at risk of developing CMV disease. Like other herpesviruses, after initial infection CMV can establish a life-long latent infection. During latency, the virus remains dormant in the human body and ....Human cytomegalovirus (CMV) is a herpesvirus which infects a majority of the population. HCMV is a significant cause of serious, life-threatening disease in neonates and in people who are immunosuppressed. Transplant recipients such as bone marrow, kidney and heart transplant patients are particularly at risk of developing CMV disease. Like other herpesviruses, after initial infection CMV can establish a life-long latent infection. During latency, the virus remains dormant in the human body and no infectious virus is made. However, when conditions are right the virus can awaken (ie reactivate) from its latent state, producing new infectious virus and disease. It is in immunosuppressed individuals such as transplant patients that viral latency and reactivation are of most medical concern, yet viral latency remains very poorly understood. The overall aim of these studies is to provide a much better understanding of how CMV latency is established and maintained, with the ultimate goal of making advances for the design of anti-viral therapies to disrupt these processes. This project has three major components: Firstly, we aim to identify and characterise viral gene expression during the establishment of latency and these findings will have profound implications to our understanding of latency. Secondly, we will examine how human cells are affected when they become latently infected. A new and exciting technology called DNA microarray now makes it possible to examine the expression of many thousands of genes in a single experiment. For the first time, we will be able to determine how the cell changes during the establishment and maintenance phases of latency. Thirdly, we will apply microarray technologies to determine how human cell genes are altered in response to the expression of individual viral genes that are active during the latent phase of infection.Read moreRead less
Prophylactic Vaccine To Prevent Cytomegalovirus Disease
Funder
National Health and Medical Research Council
Funding Amount
$436,360.00
Summary
This project is aiming to develop a prophylactic vaccine against a common herpesvirus which has been linked to the birth defects in new born babies and significant morbidity and mortality in transplant patients. In this project we are testing a novel nanoparticle-based vaccine formulation which stimulates the immune system with single injection and the immunity induced is sustained for long-term.
Human Cytomegalovirus Gene Expression And Functions During Latent Infection And Reactivation
Funder
National Health and Medical Research Council
Funding Amount
$789,473.00
Summary
Human cytomegalovirus has the ability to hide in the body in a latent form for the life of the host. However, the virus can awaken (reactivate) from its latent state, producing new infectious virus and disease. It is in immunosuppressed people such as transplant patients that reactivation from latency causes significant morbitity and mortality, yet the latent infection remains very poorly understood. This project will identify and define the functions of viral genes that facilitate latency.
Multiple Cytomegalovirus Infections: Biological And Evolutionary Significance.
Funder
National Health and Medical Research Council
Funding Amount
$555,776.00
Summary
This project involves the study of cytomegalovirus (CMV) a common viral infection of humans which normally cause little disease. However in individuals whose immune system is suppressed (such as AIDS patients or transplant recipients), or in infection of pregnant women, CMV can cause serious or life-threatening disease in the patient or foetus. An interesting feature of CMV diseases in such patients is that enhanced viral growth and more severe disease is frequently associated with the presence ....This project involves the study of cytomegalovirus (CMV) a common viral infection of humans which normally cause little disease. However in individuals whose immune system is suppressed (such as AIDS patients or transplant recipients), or in infection of pregnant women, CMV can cause serious or life-threatening disease in the patient or foetus. An interesting feature of CMV diseases in such patients is that enhanced viral growth and more severe disease is frequently associated with the presence of multiple strains of CMV in the patient. We suggest that mixed CMV infections provide a survival advantage to the virus, with different strains within the mixed infection assisting the growth of other strains. This would result in increased virus growth overall, and enhanced disease. To study the mechanisms by which multiple infections with different CMV strains may affect both the virus and the host, experiments will be performed using an animal model of CMV, murine cytomegalovirus (MCMV). We will examine the effect of the presence of multiple strains of virus on virus growth and distribution within the infected host. We will also determine if functional MCMV strains are capable of assisting non-functional strains to survive within the host. These studies are relevant to the design of a CMV vaccine, and will be valuable in revealing the ways in which viruses can co-operate within an infection.Read moreRead less
Analysis Of Viral And Cellular Gene Expression During Human Cytomegalovirus Latent Infection Of Hematopoietic Cells
Funder
National Health and Medical Research Council
Funding Amount
$407,545.00
Summary
Human cytomegalovirus (HCMV) is a herpesvirus which infects a majority of the population. HCMV is a significant cause of serious, life-threatening disease in neonates and in people who are immunosuppressed. Transplant recipients such as bone marrow, kidney and heart transplant patients are particularly at risk of developing HCMV disease. Like other herpesviruses, after initial infection HCMV can establish a life-long latent infection. During latency, the virus remains dormant in the human body a ....Human cytomegalovirus (HCMV) is a herpesvirus which infects a majority of the population. HCMV is a significant cause of serious, life-threatening disease in neonates and in people who are immunosuppressed. Transplant recipients such as bone marrow, kidney and heart transplant patients are particularly at risk of developing HCMV disease. Like other herpesviruses, after initial infection HCMV can establish a life-long latent infection. During latency, the virus remains dormant in the human body and no infectious virus is made. However, when conditions are right the virus can awaken (ie reactivate) from its latent state, producing new infectious virus and disease. It is in immunosuppressed individuals such as transplant patients that viral latency and reactivation are of most medical concern, yet viral latency remains very poorly understood. This project has three major components. Firstly, we aim to continue studies which are defining what viral genes are active (ie expressed) during latent infection. Identification of these genes and determination of how they function may have profound implications to our understanding of latency. Secondly, we will examine how human cells are affected when they become latently infected. A new and exciting technology called DNA microarray now makes it possible to examine the expression of many thousands of genes in a single experiment. For the first time, we will be able to determine how the cell changes during latency and reactivation. The study of viral and cellular gene expression during latency may contribute to the development of drugs which interfere with the viruses ability to become latent or reactivate. Thirdly, we have preliminary results which suggest that latent HCMV may actively avoid detection by the immune system. In this project we also aim to determine the mechanism by which the virus interferes with the expression of molecules which are an essential component of our immune system.Read moreRead less
Cross-reactive Anti-viral T Cells Mediate Allograft Rejection In Lung Transplantation.
Funder
National Health and Medical Research Council
Funding Amount
$379,563.00
Summary
In solid organ transplantation chronic viral infections can play a major role in causing graft dysfunction and-or loss. This study investigates the role of a specific population of immunological cells. These specific anti-viral immune cells are key controllers of viral infections and have also been implicated in mediating the destruction and-or rejection of a transplanted graft.