New defense discovered against common hospital-acquired infection
Scientists plan to imitate cell response to protect against toxins generated
by antibiotic-resistant bacteria
GALVESTON — Researchers have discovered a key mechanism used by intestinal cells to defend themselves against one of the world's most common hospital-acquired bacterial infections — a mechanism they think they can exploit to produce a therapy to protect against the effects of the antibiotic-resistant bacteria.
The scientists made their discovery while investigating cellular responses to two powerful toxins generated by the bacteria Clostridium difficile, which can cause symptoms ranging from diarrhea to life-threatening bowel inflammation.
“About one percent of all hospital patients develop a C. difficile infection — they're treated with antibiotics to the point that benign gut bacteria are knocked out, and because C. difficile is resistant to antibiotics it's able to proliferate,” said University of Texas Medical Branch at Galveston associate professor Tor Savidge, lead author of a paper on the discovery to be published online Aug. 21 in Nature Medicine. “Then it releases these toxins that trigger colonic disease.”
The toxins wreak havoc on cell structural proteins and biochemical communications networks, eventually killing the cell. But in order to do this damage, the toxins first have to get into the cell, and that means passing through the protective membrane that surrounds it.
It's there that Savidge and his collaborators — a multidisciplinary team of researchers from UTMB, UCLA, Case Western Reserve University, Tufts University and the Commonwealth Medical College — may have found a way to stop them.
On the molecular scale, C. difficile toxin proteins are quite large — big enough that they have to “cleave” so that a smaller piece can slip through the membrane and into the cell. This cleavage is accomplished by a built-in molecular guillotine called a cysteine protease, which activates when the toxin encounters a molecule called InsP6 that is present at much higher levels inside the cell than outside.
“It's sort of like a sensor mechanism that detects when it's in a cell — the toxins say, InsP6 is here, it's time to cleave,” Savidge said. “But we've identified a previously unknown protective response that activates after the toxins have induced gut inflammation, in which the host uses a process called nitrosylation to shut down the cysteine protease and prevent cleavage.”
A toxin that's unable to cleave stays stuck in the cell membrane, incapable of attacking the cell.
The researchers used test-tube, cell culture, patient specimens and animal model experiments, along with computer simulations of molecular interactions, to thoroughly explore this response — and to successfully devise a way to mimic it for therapeutic purposes.
“Think of these toxins as missiles that the bacteria is producing to go off and detonate inside the cell,” Savidge said. “One way to defend against missiles is to send out signals that trick them into either disarming their sensory mechanisms or get them to prematurely detonate.”
Cell culture and mouse experiments demonstrated that a combination of GSNO (the nitrosylating agent and the “disarming” part of Savidge's analogy) and InsP6 (the “premature detonation” part) worked to prevent damage from C. difficile. In fact, the combination therapy worked so well that the team is now preparing to test it in a clinical trial sponsored by UTMB's Institute for Translational Sciences.
“Identification of new treatment modalities to treat this infection would be a major advance,” said Dr. Charalabos Pothoulakis, director of UCLA's Inflammatory Bowel Disease Center and a co-author on the study. “If we are successful with this approach, we may be able to treat other bacterial diseases in a similar way.”
Other authors of the Nature Medicine article include UTMB's Petri Urvil, Numan Oezguen, Vine Zachary, Irina Pinchot, Alfredo Torres, Robert English, John E. Wiktorowicz, Michael Loeffeholz and Werner Braun; Case Western Reserve's Jonathan Stamler, Alfred Hausladen and Bo Herman; Commonwealth Medical College's Raj Kumar; and Hanping Feng, Lianfa Shi and Weijia Nie of the Tufts University Cummings School of Veterinary Medicine.
Two additional authors were participants in UTMB's High School Summer Research Program: Ali Kausar, a senior at Houston's Clear Lake High School, and Aproteem Choudhury, a sophomore at Clear Springs High School in League City, Texas. The program is sponsored by UTMB's Office of Educational Outreach and funded by the Howard Hughes Medical Institute.