A New Scrambled Antigen Vaccine (SAVINE) Approach: Proof-of-concept In Non-human Primates For HIV-1
Funder
National Health and Medical Research Council
Funding Amount
$120,700.00
Summary
The specific aim of this proposal is to demonstrate, in non-human primates, proof–of-concept of a patented new platform vaccine technology (scrambled antigen vaccine or SAVINE) designed to encode all the protein sequences of an infectious agent, in this case HIV-1. These are arranged as equal-sized, overlapping fragments such that all potential T cell epitopes that are needed to induce broad T-cell-mediated immunity are maintained. The synthetically designed vaccine uses consensus sequences of H ....The specific aim of this proposal is to demonstrate, in non-human primates, proof–of-concept of a patented new platform vaccine technology (scrambled antigen vaccine or SAVINE) designed to encode all the protein sequences of an infectious agent, in this case HIV-1. These are arranged as equal-sized, overlapping fragments such that all potential T cell epitopes that are needed to induce broad T-cell-mediated immunity are maintained. The synthetically designed vaccine uses consensus sequences of HIV-1 to provide universal coverage of the major HIV-1 strains for a global population. The synthetic systematically designed HIV-1 vaccine will be delivered using our newly developed prime-boost immunisation regime that induces particularly high levels of cell-mediated immunity.Read moreRead less
Efficacy Of Asexual Blood-stage Antigens And Antigen Combinations For Vaccination Of Mice Against Plasmodium Chabaudi.
Funder
National Health and Medical Research Council
Funding Amount
$286,320.00
Summary
The development of a vaccine against malaria is one of the world's major public health priorities. Over the last two decades much progress has been made towards the development of a malaria vaccine but none is yet available that is suitable for use in humans. Many parasite molecules have been identified that are considered potential components of a malaria vaccine and some of these have already reach the stage of being tested in early clinical trials. However, a major problem confronting the fie ....The development of a vaccine against malaria is one of the world's major public health priorities. Over the last two decades much progress has been made towards the development of a malaria vaccine but none is yet available that is suitable for use in humans. Many parasite molecules have been identified that are considered potential components of a malaria vaccine and some of these have already reach the stage of being tested in early clinical trials. However, a major problem confronting the field of malaria vaccine development is finding the resources necessary to test the large number of antigens and antigen combinations that are considered of potential value. One way to gain information that will help to determine which antigens and antigen combinations should have priority for testing in clinical trials is to carry out vaccine trials in monkeys or mice using malaria parasites that infect these species. We will use Plasmodium chabaudi infections in the mouse to examine the ability of three antigens from the disease causing blood stages of the parasite to induce antibody responses that prevent the development of severe malaria. We will determine whether antigen combinations provide better protection than single antigens when mice are challenged with a variety of parasite strains. Detailed analyses of the antibody responses will be carried out to determine if combining antigens changes the response in a way that may help or hinder vaccine efficacy.Read moreRead less
Characterisation Of Susceptibility To Abacavir Hypersensitivity Carried On The HLA-B-5701, -DRB*07 And -DQ3 Haplotype
Funder
National Health and Medical Research Council
Funding Amount
$545,250.00
Summary
Drug hypersensitivity reactions (HSR) are a significant iatrogenic cause of morbidity, and even of mortality. Unfortunately the underlying mechanisms are poorly understood, making it difficult to predict which individuals may be at risk of these reactions. Research indicates that the interaction between specific drugs and the host immune system in HSR is similar to that observed in transplantation and that the major histocompatibility complex (MHC) region of the human genome assumes importance i ....Drug hypersensitivity reactions (HSR) are a significant iatrogenic cause of morbidity, and even of mortality. Unfortunately the underlying mechanisms are poorly understood, making it difficult to predict which individuals may be at risk of these reactions. Research indicates that the interaction between specific drugs and the host immune system in HSR is similar to that observed in transplantation and that the major histocompatibility complex (MHC) region of the human genome assumes importance in this setting, as it does in determining if a transplanted organ is 'rejected' or 'accepted'. We have identified a striking association between MHC genetic markers (HLA-B*5701, -DRB1*0701, and -DQ3) and HSR to the HIV drug abacavir. Carriage of these markers was found in 72% (13-18) of individuals with this reaction, and 0% (0-185) of those who tolerated abacavir (odds ratio 822), thus predicting HSR in 100% of cases, and abacavir tolerance in 97%. This represents one of the most powerful MHC gene associations with a clinical syndrome yet described. As abacavir HSR affects ~5% of abacavir users, knowledge of these genetic factors would be predicted to significantly reduce the risk of susceptible individuals developing HSR, without inappropriately denying access to abacavir. This association between the MHC and abacavir HSR in the clinical setting provides a unique opportunity to characterise mechanisms that underlie this HSR, which may give insights into drug HSR generally. Continued support of this research in the public domain, rather than in the commercial sector, will ensure that commercial considerations do not restrict the dissemination of these findings. Given the high predictive value of this readily performed genetic test in identifying at-risk individuals, there is also a clinical imperative to rapidly identify the gene(s) involved, to provide the most targeted risk assessment possible.Read moreRead less