{"id":39455,"date":"2011-11-18T00:00:00","date_gmt":"2011-11-18T06:00:00","guid":{"rendered":"https:\/\/www.unmc.edu\/newsroom\/2011\/11\/18\/unmc-dean-part-of-landmark-study-looking-at-antibiotic-resistant-bacteria\/"},"modified":"2022-08-22T16:18:16","modified_gmt":"2022-08-22T21:18:16","slug":"unmc-dean-part-of-landmark-study-looking-at-antibiotic-resistant-bacteria","status":"publish","type":"post","link":"https:\/\/www.unmc.edu\/newsroom\/2011\/11\/18\/unmc-dean-part-of-landmark-study-looking-at-antibiotic-resistant-bacteria\/","title":{"rendered":"UNMC dean part of landmark study looking at antibiotic resistant bacteria"},"content":{"rendered":"

Results could provide foundation for making antibiotics more effective<\/o:p><\/span><\/i><\/b><\/p>\n

A University of Nebraska Medical Center<\/a> physician-scientist, Bradley Britigan, M.D.<\/font><\/a>, was one of the authors on a landmark study that has determined why bacteria are antibiotic resistant and how disrupting key bacterial functions could result in making antibiotics more effective. <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

The study, which appears in this week’s issue of Science<\/font><\/a>, brought together researchers from three U.S. universities (Washington<\/font><\/a>, Cincinnati<\/font><\/a> and Northwestern<\/font><\/a>), one Canadian university (McGill<\/font><\/a>) and one Canadian research institution (INRS Armand Frappier<\/font><\/a>).<\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

Dr. Britigan, who took over as dean of the UNMC College of Medicine on July 1, participated in the study while serving on the faculty of the University of Cincinnati. <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

Many infections, even those caused by antibiotic-sensitive bacteria, resist treatment. This paradox has vexed physicians for decades, and makes some infections impossible to cure. <\/p>\n

<\/span><\/p>\n

A key cause of this resistance is that bacteria become starved for nutrients during infection.  <\/span>Starved bacteria resist killing by nearly every type of antibiotic, even ones they have never been exposed to before.  <\/span><\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

“Bacteria become starved when they exhaust nutrient supplies in the body, or if they live clustered together in groups know as biofilms,” said the lead author of the paper, Dao Nguyen, M.D.<\/a>, an assistant professor of medicine at McGill University in Montreal.<\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

Biofilms are clusters of bacteria encased in a slimy coating, and can be found both in the natural environment as well as in human tissues where they cause disease. For example, biofilm bacteria grow in the scabs of chronic wounds and the lungs of patients with cystic fibrosis. Bacteria in biofilms tolerate high levels of antibiotics without being killed. <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

“A chief cause of the resistance of biofilms is that bacteria on the outside of the clusters have the first shot at the nutrients that diffuse in,” said Pradeep Singh, M.D.,<\/a> associate professor of medicine and microbiology at the University of Washington, the senior author of the study. “This produces starvation of the bacteria inside clusters, and severe resistance to killing.”<\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

Starvation was previously thought to produce resistance because most antibiotics target cellular functions needed for growth. When starved cells stop growing, these targets are no longer active.  <\/span>This effect could reduce the effectiveness of many drugs. <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

“While this idea is appealing, it presents a major dilemma,” Dr. Nguyen noted. “Sensitizing starved bacteria to antibiotics could require stimulating their growth, and this could be dangerous during human infections.”<\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

Nguyen and Singh explored an alternative mechanism. Microbiologists have long known that when bacteria sense that their nutrient supply is running low, they issue a chemical alarm signal. The alarm tells the bacteria to adjust their metabolism to prepare for starvation. Could this alarm also turn on functions that produce antibiotic resistance? <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

To test this idea, the team engineered bacteria in which the starvation alarm was inactivated, and then measured antibiotic resistance in experimental conditions in which bacteria were starved.  <\/span>To their amazement, bacteria unable to sense starvation were thousands of times more sensitive to killing than those that could, even though starvation arrested growth and the activity of antibiotic targets. <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

“That experiment was a turning point,” Dr. Singh said. “It told us that the resistance of starved bacteria was an active response that could be blocked.  <\/span>It also indicated that starvation-induced protection only occurred if bacteria were aware that nutrients were running low.” <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

With the exciting result in hand, the researchers turned to two key questions.  <\/span>First does the starvation alarm produce resistance during actual infections?  <\/span>To test this, the team examined naturally-starved bacteria, biofilms, isolates taken from patients, and bacterial infections in mice.  <\/span>Sure enough, in all cases the bacteria unable to sense starvation were far easier to kill. <\/o:p><\/span><\/p>\n

  <\/span><\/o:p><\/span><\/p>\n

The second question centered on the mechanism of the effect.  <\/span>How does starvation sensing produce such profound antibiotic resistance?  <\/span>Again, the results were surprising.  <\/span><\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

Instead of well-described resistance mechanisms, like pumps that expel antibiotics from bacterial cells, the researchers found that the protective mechanism involved defense against toxic forms of oxygen, called radicals.  <\/span>This mechanism jives with new findings showing that antibiotics kill by generating these toxic radicals. <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

The findings suggest new approaches to improve treatment for a wide range of infections. “Discovering new antibiotics has been challenging,” Dr. Nguyen said.  <\/span>“One way to improve infection treatment is to make the drugs we have work better. Our experiments suggest that antibiotic efficacy could be increased by disrupting key bacterial functions that have no obvious connection to antibiotic activity.”<\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

The work also highlights the critical advantage of being able to sense environmental conditions, even for single-celled organisms like bacteria. Cells unaware of their starvation were not protected, even though they ran out of nutrients and stopped growth. This proves again that, even for bacteria, “what you don’t know can<\/i> hurt you.” <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

Dr. Britigan’s lab in Cincinnati performed the measurements of the antioxidant defenses of the bacteria and provided expertise in the area of oxidative stress, a focus of Dr. Britigan’s lab for more than 20 years. Dr. Britigan began working with Dr. Singh in the early 2000s when they were all on the faculty of the University of Iowa.<\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

"We have long known that the production of oxygen radicals are critical to the ability of white blood cells to kill invading bacteria,” Dr. Britigan said. “This work provides increasing evidence that these same molecules play a significant role in the killing of bacteria by antibiotic and that antibiotic resistance is linked to this process. <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

“The current work provides a cellular mechanism to explain this link and importantly may provide new approaches to negate bacterial resistance to antibiotics, a growing problem in treating patients.”<\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

Dr. Britigan said with his lab moving from Cincinnati to Omaha that he hopes to continue working with Drs. Singh and Nguyen, as well as investigators at UNMC, to extend these studies.<\/span><\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

The Burroughs Welcome Fund, the Cystic Fibrosis Foundation, the National Institutes of Health, and the Canadian Institutes for Health Research supported this research. <\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

In addition to Drs. Britigan, Nguyen and Singh, other researchers on the study included: Amruta Joshi-Datar, Elizabeth Bauerle, Karlyn Beer, and Richard Siehnel of the Departments of Medicine and Microbiology at the University of Washington; James Schafhauser of McGill University; Francois Lepine of INRS Armand Frappier in Canada; Oyebode Olakanmi of the University of Cincinnati; and Yun Wang of Northwestern University.<\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

Through world-class research and patient care, UNMC generates breakthroughs that make life better for people throughout Nebraska and beyond. Its education programs train more health professionals than any other institution in the state. Learn more at unmc.edu. <\/span><\/i><\/o:p><\/span><\/i><\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"

Results could provide foundation for making antibiotics more effective A University of Nebraska Medical Center physician-scientist, Bradley Britigan, M.D., was one of the authors on a landmark study that has determined why bacteria are antibiotic resistant and how disrupting key bacterial functions could result in making antibiotics more effective.   The study, which appears in 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