Expression Of Malaria Parasite Invasion Associated Proteins In The Sporozoite Novel Vaccination Strategy
Funder
National Health and Medical Research Council
Funding Amount
$202,000.00
Summary
Efforts to develop vaccines against malaria still represent a substantial focus of current research activities. Antigens present in the erythrocytic pathogenic stages of the infection account for the majority of targets investigated for potential vaccines. Experimental vaccines targeting the pre-erythrocytic stages [the sporozoite injected by the mosquito, and the hepatic stage parasite) have encompassed a lesser diversity of parasite antigens]. This is the case despite the fact that experimenta ....Efforts to develop vaccines against malaria still represent a substantial focus of current research activities. Antigens present in the erythrocytic pathogenic stages of the infection account for the majority of targets investigated for potential vaccines. Experimental vaccines targeting the pre-erythrocytic stages [the sporozoite injected by the mosquito, and the hepatic stage parasite) have encompassed a lesser diversity of parasite antigens]. This is the case despite the fact that experimentally induced sterile long-lasting immunity in humans has so far only been achieved through exposure to irradiated sporozoites. The acquisition and maintenance of this immunity depends on the use of invasive sporozoites and on the presence of developmentally arrested hepatic stage parasites.Read moreRead less
Hydatid infection is caused by a parasite that is transmitted by livestock animals. This project will develop a treatment for livestock animals which, when used in combination with a vaccine against the parasite, will improve the effectiveness of efforts to prevent the disease being transmitted through animals. I indirectly this will lead to a reduction in the number of new cases of hydatid disease world wide.
Transport Pathways Of Host-derived Iron In Schistosomes Parasites
Funder
National Health and Medical Research Council
Funding Amount
$322,091.00
Summary
This project will identify the diversity and biological roles of receptors for metabolic iron expressed on the body surface of the parasitic blood flukes (schistosomes) of humans. Schistosomes are a major health problem in many tropical countries and are responsible for significant human morbidity and lost productivity. Adult worms feed on human blood, from which derive amino acids for the production of many hundreds of eggs released per day into the human blood stream. The intense cellular resp ....This project will identify the diversity and biological roles of receptors for metabolic iron expressed on the body surface of the parasitic blood flukes (schistosomes) of humans. Schistosomes are a major health problem in many tropical countries and are responsible for significant human morbidity and lost productivity. Adult worms feed on human blood, from which derive amino acids for the production of many hundreds of eggs released per day into the human blood stream. The intense cellular response induced by parasite eggs trapped in body organs is the major cause of chronic human disease. We have discovered two intriguing phenomena of iron metabolism in schistosomes. Firstly, schistosomes have a greater reliance on iron than many other organisms, storing a surfeit in cells that produce the protein-rich egg shell. Secondly, a major transmembrane iron transporter of the parasites, thought to be involved in the uptake of iron, is found on the parasite external body surface and not in the parasite intestine. The extensive nutritional dependence of these worms on iron and the surface location of mediators of iron uptake raise the exciting possibility that we have uncovered a novel system that might be exploited for vaccine or drug-mediated control of these significant human parasites. If we can dissect the pathways schistosomes use to derive iron from their hosts, we may be able to generate vaccines to block this nutritional pathway, or use drugs to block embryogenesis. This project is a fact-finding mission that asks if the host-interactive tegument of these parasites is a major source of metabolic iron. Molecules we demonstrate to be present on the surface will be tested as vaccine candidates in mouse vaccine trialsRead moreRead less
Translating Novel Vaccine Strategies To Early Phase Clinical Trials
Funder
National Health and Medical Research Council
Funding Amount
$855,986.00
Summary
My Fellowship will enable me to further develop and then test in pre-clinical and clinical trials novel vaccine candidates that we are developing to prevent infections with malaria parasites and with Streptococcus pyogenes. Malaria is responsible for the loss of over 600,000 young lives each year and S. pyogenes is responsible for over 500,000 deaths per year. Australia's Indigenous populations suffer the highest reported rates of streptococcal-related pathology worldwide.
Apical Membrane Proteins As Targets For A Schistosomiasis Vaccine
Funder
National Health and Medical Research Council
Funding Amount
$480,459.00
Summary
Schsitosomiasis is a chronic neglected tropical disease for which there is currently no vaccine. A vaccine is sorely needed to control this parasite. This proposal seeks to identify molecules from the outer surface of the parasite which are recognised by the immune system of people from Brazil who are resistant to schistosomiasis. Molecules identified in this manner will be tested as vaccines in an animal model of schistosomiasis, and ranked based on their performances to enter human trials.