Evolution And Function Of A Novel Lateral Flagellar Locus, Flag-2, In Pathogenic Escherichia Coli
Funder
National Health and Medical Research Council
Funding Amount
$465,158.00
Summary
This project will study how the bacteria that cause infant diarrhoea colonize the intestine and induce disease. We have identified a novel genetic region that allows E. coli to survive and persist in the intestine. Similar genes are also present in closely related organisms. This project will help us to undestand how new diseases evolve and emerge and may lead to the development of new vaccines to protect against infant diarrhoea.
Contribution Of Nuclear Targeting Of The NleE-OspZ Family Of Proteins To Escherichia Coli And Shigella Virulence
Funder
National Health and Medical Research Council
Funding Amount
$542,462.00
Summary
This project will study how the bacteria that cause infant diarrhoea colonize the intestine and induce disease. We have identified new bacterial proteins that allow E. coli to manipulate the normal host cell processes involved in killing an invading bacterium. Similar proteins are also present in the closely related organism, Shigella which causes dysentary. We will determine how these proteins act by finding the host cell proteins they bind.
The Use Of Probiotics To Reduce The Incidence Of Sepsis In Premature Infants.
Funder
National Health and Medical Research Council
Funding Amount
$808,733.00
Summary
Currently, premature infants are born without the normal immune defenses of infants born at the correct time because the protective factors that normally pass from the mother to the baby during the last few months of pregnancy have not had time to do so. In addition the tiny premature infants are at risk because they need the expertise of intensive care and are therefore separated from their parents and their parents' organisms which healthy term infants normally pick up from the birth canal and ....Currently, premature infants are born without the normal immune defenses of infants born at the correct time because the protective factors that normally pass from the mother to the baby during the last few months of pregnancy have not had time to do so. In addition the tiny premature infants are at risk because they need the expertise of intensive care and are therefore separated from their parents and their parents' organisms which healthy term infants normally pick up from the birth canal and their parents skin. The infants commonly develop infections from organisms living on their skin surfaces or inside their lungs, stomach or bowels. The babies are living in a hospital environment which they need to survive, but they may pick up particularly unhealthy organisms (pathogens) that produce toxins, which are difficult to treat even with antibiotics. These infections are so severe that one-fifth of the babies die, even in Australia where facilities for premature infants are excellent. Two recent studies overseas have shown that giving premature babies special preparations of certain probiotic organisms decreases the chance of babie developing infections. Probiotics are organisms that have health benefits. Probiotics tighten the spaces between cells to stop bacteria getting into the body, produce substances that kill other bacteria and promote the production of immunoglobulin A by the baby's own cells. Immunoglobulin A is a substance that lines the bowel wall and protects the baby from invasion by bacteria. This study will offer this probiotic product to very premature babies in a trial to see if it produces additional benefits for our babies in Victoria. Around five hundred babies will be given the product and five hundred will be given the placebo ( a harmless inert product which will look just like the real probiotic). Currently 23% of our babies get the serious infections and this study is powerful enough to see if we can reduce the number by one third.Read moreRead less
Spatio-temporal Analysis Of Rat Intestinal Motility In Physiological And Disease Models
Funder
National Health and Medical Research Council
Funding Amount
$358,750.00
Summary
This project addresses the question of how the movements of the gut are controlled in health and disease. The progress of food along the gut is due to movements of the involuntary muscle of the wall of the intestine. Three fundamental mechanisms are involved. One is the spontaneous ability of the intestinal muscle to contract rhythmically and is driven by a delicate net of pacemaker cells. Fast propulsion of food contents depends on nerve circuits in the gut wall that generate a powerful pumping ....This project addresses the question of how the movements of the gut are controlled in health and disease. The progress of food along the gut is due to movements of the involuntary muscle of the wall of the intestine. Three fundamental mechanisms are involved. One is the spontaneous ability of the intestinal muscle to contract rhythmically and is driven by a delicate net of pacemaker cells. Fast propulsion of food contents depends on nerve circuits in the gut wall that generate a powerful pumping behaviour to prevent over-filling or to eject toxic or irritating substances (eg: some laxatives activate this mechanisms). This is often called peristalsis. A third mechanism consists of activity of nerve cells in the gut, that slowly propagates along the intestine and causes the muscle to contract, sweeping along any remnants. The movements generated by these three mechanisms occur in segments of intestine isolated from rats. The major difficulty up until now has been to relate the actual movements in living animals to these fundamental mechanisms. It is now possible to bridge this gap because we have developed methods to record, display and measure graphically the actual movements. Movements are transformed into spatio-temporal maps which show all of the contractions over a period of time. Coordinated activity is visible in these maps as recognisable patterns or visual objects. Measurements can be readily made with conventional statistics. The literature in gastroenterology is full of descriptions of motility based on indirect methods of recordings. In this project we will be able to correlate the previous indirect methods with the new graphic methods and thus establish a clearer, simpler and more accurate classification of normal patterns of intestinal motility. We will then use this to establish what goes wrong in a number of experimental diseases known to affect adversely the movements of the intestine.Read moreRead less