About 100 drugs already approved by the Food and Drug Administration (FDA) for other purposes can also prevent the growth of certain bacterial pathogens inside human cells, including those that cause Legionnaires' disease, brucellosis, and Mediterranean spotted fever. The findings, published in mBio®, the online open-access journal of the American Society for Microbiology, demonstrate a new way of identifying non-antibiotic drugs that could one day help curb bacterial infections.
A handful of drugs on the list inhibit the growth of at least three of the four bacterial organisms tested. Those drugs include familiar compounds like loperamide, an antidiarrheal medication sold under the brand name Imodium® and clemastine, an allergy medicine sold as Tavist®, as well as drugs used to treat high blood pressure and angina.
Howard Shuman, professor of microbiology at the University of Chicago and a senior author on the study cautions that this study only looked at infection in the laboratory dish and therefore whether the drugs would effectively treat infections in humans is not known. The work, he says, is a good first step showing this method can identify FDA-approved drugs that might potentially act alongside traditional antibiotics.
"Antibiotic therapy is becoming more difficult to achieve, so looking for alternatives is always a good thing to do," Shuman says.
Shuman and his colleagues thought that certain types of bacteria-those that infect human cells and then replicate inside those cells-might be vulnerable to other drug approaches.
"Intracellular bacteria resemble viruses in that they need host cell functions to complete their life cycle," says Shuman. So the researchers screened drugs to look for compounds that interfered with those cellular processes. They chose a panel of 640 FDA-approved drugs that have known safety and side effect profiles.
The researchers measured each drug's ability to disrupt the intracellular growth of four bacterial strains: Coxiella burnetii (which causes Q fever), Legionella pneumophila (Legionnaires' disease), Brucella abortus (brucellosis), and Rickettsia conorii (Mediterranean spotted fever). Although none of these organisms have become problem infections in the U.S. due to antibiotic resistance, brucellosis and Q fever can both cause chronic and ultimately fatal disease in about 5 percent of those infected.
The team screened each drug for its ability to reduce intracellular bacterial growth by 80 percent or more inside human THP-1 macrophage-like immune cells. They eliminated drugs from the list that simply killed off the human host cells or that were known antibiotic or antiviral drugs and identified 101 drugs that presumably disrupt key cellular functions in the host cells.
Shuman's lab group did the experiments on C. brunetii and L. pneumophila, while Sean Crosson's group at University of Chicago carried out the B. abortus work, and Juan Martinez's group, now at Louisiana State University in Baton Rouge, performed the R. conorii studies. The work, which was done at the Howard T. Ricketts Laboratory, a biocontainment laboratory operated by the University of Chicago in Lemont, Illinois, shows that known drugs that interfere with host cell properties can stall intracellular bacterial infections.
"There are emerging infections of all sorts-bacteria, viruses, parasites. Working up a new therapy for such things take time," says Shuman. "If we have drugs X, Y, or Z to interfere with host cell functions to slow or impede an infection, then we can have something already on hand to attack it."
This research is supported by the U.S. National Institutes of Health.
Source: American Society for Microbiology
Dear Helpdesk: Working in a Toxic Health Care Environment
March 28th 2024Dear Helpdesk is your steadfast companion, offering life coaching and workplace advice from 2 seasoned IPs for some of your most challenging real-life situations. Let us help you navigate the intersection between work and life, guiding you to navigate the dynamic world of infection prevention with confidence and grace. This article is on handling a toxic health care environment.
Product Locator: Spring and Early Mother's Day Gift Guide for Infection Prevention Personnel
March 27th 2024Whether it's a spring holiday, birthdays, or no reason at all, infection prevention personnel love to give and receive gifts that help at the end of a stressful day. Infection Control Today® offers some gift ideas for infection prevention personnel and their families.
Catching Up With Vangie Dennis, AORN 2022-2023 President at AORN 2024
March 26th 2024Infection Control Today (ICT) had the privilege of catching up with Vangie Dennis, MSN, RN, CNOR, CMLSO, at the Association of periOperative Registered Nurses' (AORN’s) International Surgical Conference & Expo 2024. As the former president of AORN and an esteemed figure in perioperative services, Vangie Dennis shared insights into her recent endeavors and the exciting new chapter she's embarked upon.
How To Optimize Your Time Management Strategies for the Busy Infection Preventionist
March 25th 2024Is your calendar resembling a chaotic masterpiece of overlapping tasks? Join the club of infection preventionists striving to balance responsibilities. Dive into proven strategies from a fellow infection preventionist to reclaim control of your time, streamline tasks, and boost productivity effectively. This is an IP Lifeline article.