(Sept. 23, 2014) -- Karl Klose, professor of biology and a researcher in UTSA's South Texas Center for Emerging Infectious Diseases, has teamed up with researchers at Ruhr University in Bochum, Germany, to understand how humans get infected with cholera. Their findings were released this week in an article published by the Proceedings of the National Academy of Sciences.
Cholera is an acute infection caused by ingestion of food or water that is contaminated with the bacterium Vibrio cholerae. An estimated three to five million cases are reported annually and 100,000-120,000 people die from cholera infections every year. Cholera patients suffer from dramatic fluid loss and can lose up to 40 liters of fluid from their body in just a few days.
Klose and his collaborators discovered that Vibrio cholerae, which normally lives in oceans and rivers, senses a shift in temperature as it enters the human body through a mechanism called a Ribonucleic Acid (RNA) thermometer. The thermometer detects the higher body temperature of 98.6 degrees Fahrenheit, and then turns on the virulence factors that lead to cholera.
Klose's laboratory showed that interfering with the thermometer prevents the bacteria from causing disease, suggesting possible therapeutic outcomes from this research. The research collaboration stemmed from a long friendship between Klose and Franz Narberhaus, who trained as microbiologists together at U.C. Berkeley 25 years ago.
"The temperature shift is one of the signals that the bacterium uses to turn on the virulence factors, such as the cholera toxin, that cause the disease," said Klose. "We have shown that the bacteria's thermometer controls temperature-dependent expression of the virulence factors. They only express them when they are at body temperature and not at ocean temperature."
"We found that if the RNA thermometer is prevented from working correctly and detecting the right temperature, the bacteria won't cause any disease at all. The organisms will just pass right through the body," explained Klose. "If you can figure out how to disrupt the RNA thermometer in some manner, then you may have a therapy against this disease."
Klose says the long-term goal is to come up with intervention strategies against cholera. Understanding exactly how the bacterium controls the expression of the virulence factors is one step forward in trying to intervene during cholera epidemics.
Take Back the Night is an international initiative to end violence. The event begins with banner making, followed by a march, presentations and poetry reading.
Sombrilla, Main Campus
Members of the UTSA community have published “Adapt and Overcome: Essays of the Student Veteran Experience,” an important book to help active duty military and veterans successfully transition to college life. The event includes a panel discussion with UTSA alumni student veterans who contributed chapters to the book. Guests can also purchase the book. All proceeds benefit the UTSA Student Veteran Association.
Business Building, University Room (BB 2.06.04), Main Campus
The Graduate School is hosting a panel discussion for all of our current students, alumni and members of the San Antonio community who are interested in learning more about graduate education.
Graduate School and Research Building (GSR 1.204), Main Campus
The annual UTSA Graduate fair gives students an opportunity to meet representatives who can provide the information on admission requirements, fellowship opportunities, and other key information.
University Center, Main Campus
A recruiter will speak to potential candidates for the Archer program. The Archer program has helped students land successful careers in public service.
Durango Building (DB 2.208), Downtown Campus
Canadian scholar Jasmin Hristov will present a lecture on paramilitarism, complex type of politically-motivated violence in different parts of Latin America. This presentation will explain paramilitary violence as a tool of economic globalization.
Buena Vista St. Bldg., Aula Canaria Lecture Hall (BV 1.328), Downtown Campus
The UTSA College of Engineering Technology Symposium showcases innovative student projects and research performed across multiple disciplines including engineering, science and business. The public is invited.
H-E-B UC Ballroom (HUC 1.104), Main Campus
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