[ Back to EurekAlert! ] Public release date: 14-Mar-2012
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Contact: Tom Vasich
tmvasich@uci.edu
949-824-6455
University of California - Irvine

UCI-led study uncovers how Salmonella avoids the body's immune response

Findings point to new approaches to fighting powerful gut infections

Irvine, Calif., March 14, 2012 UC Irvine researchers have discovered how Salmonella, a bacterium found in contaminated raw foods that causes major gastrointestinal distress in humans, thrives in the digestive tract despite the immune system's best efforts to destroy it.

Their findings help explain why Salmonella is difficult to eradicate and point to new approaches for possible treatments. Most people infected with Salmonella suffer from diarrhea, fever and abdominal cramps for up to seven days before the infection resolves.

Lead researcher Manuela Raffatellu, a UCI assistant professor of microbiology & molecular genetics, and colleagues identified a novel molecular mechanism that allows Salmonella to survive. Results of their study appear in the March issue of Cell Host & Microbe.

Pathogens like Salmonella flourish and cause disease in humans through a process by which they acquire metal ions, such as zinc, from the body. One of the body's key immune responses is to flood the infected area with antimicrobial proteins that include calprotectin, which removes zinc. Without enough of this vital element, most pathogens eventually die.

Raffatellu's team found, however, that salmonellae overcome this immune response by expressing specialized transporter proteins that enable the bacteria to acquire zinc in spite of calprotectin reducing the amount available in the digestive tract. This distinctive mechanism lets salmonellae continue proliferating.

At the same time, calprotectin inadvertently promotes Salmonella growth by killing the microbes that normally reside within the intestines and help the immune system battle pathogenic bacteria.

"We're beginning to learn more about the mechanisms that allow pathogens like Salmonella to evade our natural defenses and make us sick," Raffatellu said. "In light of this, if we can devise therapies that block the acquisition of zinc and other metals by Salmonella specifically, we can fight this infection."

Additionally, she said, the new findings may have relevance for other illnesses, such as inflammatory bowel disease and colon cancer, in which high levels of calprotectin are detected.

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Also contributing to the study, which was supported by grants from the National Institutes of Health, were Janet Z. Liu, Stefan Jellbauer, Adam Poe, Vivian Ton, Michele Pesciaroli, Martin Hosking, Robert A. Edwards and Thomas E. Lane of UCI; Thomas Kehl-Fie, Nicole A. Restrepo, Walter J. Chazin and Eric P. Skaar of Vanderbilt University; Andrea Battistoni of the University of Rome; Thomas Vogl and Johannes Roth of the University of Munster, Germany; and Paolo Pasquali of the Superior Health Institute in Rome.

About the University of California, Irvine: Founded in 1965, UCI is a top-ranked university dedicated to research, scholarship and community service. Led by Chancellor Michael Drake since 2005, UCI is among the most dynamic campuses in the University of California system, with nearly 28,000 undergraduate and graduate students, 1,100 faculty and 9,000 staff. Orange County's second-largest employer, UCI contributes an annual economic impact of $4 billion. For more UCI news, visit www.today.uci.edu.

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