Medicineworld.org: New Superbug Weapon
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New Superbug Weapon
That scenario usually found with "hospital superbugs" may well improve thanks to a discovery by a research team at the University of British Columbia, in collaboration with UBC spin-off company Inimex Pharmaceuticals, that has identified a peptide that can fight infection by boosting the body's own immune system.
"Antibiotics are now under threat because of the explosion in antibiotic-resistant bacteria. A third of all deaths on this planet are the result of infection so there is an urgent need to create new therapies," says Robert Hancock, principal investigator and Canada Research Chair in Pathogenomics and Antimicrobials. "The beauty of this peptide is that it acts on the host to trigger a protective response and doesn't act on bacteria directly. That means it's unlikely bacteria will become resistant to it".
The team observed that a peptide, or chain of amino acids, they have dubbed innate defense regulator peptide (IDR-1), can increase innate immunity without triggering harmful inflammation, and offer protection both before and after infection is present.
The discovery, in animal models, will be published March 25 in the journal Nature Biotechnology.
Scientists tested the peptide's effectiveness against Staphylococcus aureus including MRSA; a superbug called vancomycin-resistant Enterococcus (VRE); and Salmonella. In Staph and VRE infections, eventhough bacteria were not completely eradicated, IDR-1 significantly reduced bacteria counts and mortality, when given either 24-48 hours before or four hours after infection began. In Salmonella, the peptide offered significant protection when administered previous to infection setting in.
Data showed that IDR-1 activates several signaling pathways to stimulate infection-clearing chemokines a chemical mediator that mobilizes immune response.
In addition, the peptide did not produce harmful inflammation and toxicity often seen when the immune system is stimulated and, in fact, actually reduced the potentially harmful septic response. Sepsis, a consequence of a ravaging inflammatory response linked to infection, kills as a number of as 200,000 annually.
The innate immune response is the first line of defense against infection and comprises an interactive network of cellular and molecular systems that recognize and kill pathogens, as well as signaling pathways that trigger biological responses.
The scientists anticipate the treatment may be useful as a supplement to antibiotics in combating common hospital infections such as ventilator associated pneumonia, post-surgical infections, high dose chemotherapy and infections arising from insertion of catheters or other medical devices.
"We now have a powerful new tool that will allow us to stop infection before it.
starts it's a new concept in treating infection," says Hancock.
The scientists estimate there are two million cases of antibiotic-resistant infection in hospitals that kill approximately 70,000 people annually in North America. Hospital-based methicillin-resistant Staphylococcus aureus (MRSA) alone causes an estimated 100,000 hard-to-treat infections annually and is now seen in community-based infections, such as boils and abscesses or life-threatening bloodstream infections.
"Salmonella causes 1.3 million infections and up to 100 deaths every year in the U.S. We're looking at a crisis in 10 years as most bugs will be resistant to most antibiotics. There's an urgent need to develop new tools," says Brett Finlay, a UBC microbiologist and an author on the paper. He and Hancock co-founded Inimex, which conducted a number of of the experiments mandatory for the study.
Scientists expect it will be about 12-15 months before the discovery is introduced into human clinical trials.
Posted by: Mark Source
Did you know?
Imagine the desperation of trying to fight lethal infections when antibiotics fail to work. That scenario usually found with "hospital superbugs" may well improve thanks to a discovery by a research team at the University of British Columbia, in collaboration with UBC spin-off company Inimex Pharmaceuticals, that has identified a peptide that can fight infection by boosting the body's own immune system.
Medicineworld.org: New Superbug Weapon
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