Navigation Links
New route to identify drugs that can fight bacterial infections

About 100 drugs already approved by the U.S. 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 bacteriathose that infect human cells and then replicate inside those cellsmight 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% of those infected.

The team screened each drug for its ability to reduce intracellular bacterial growth by 80% 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 sortsbacteria, 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."


Contact: Jim Sliwa
American Society for Microbiology

Related biology news :

1. How bumblebees find efficient routes without a GPS
2. A better route to xylan
3. Novel combination therapy shuts down escape route, killing glioblastoma tumor cells
4. Transmission routes of spreading protein particles
5. A fly mutation suggests a new route for tackling ALS
6. Antibiotics: Change route of delivery to mitigate resistance
7. A route for steeper, cheaper, and deeper roots
8. UT Arlington nanoparticles could provide easier route for cell therapy
9. Study provides insights into birds migration routes
10. Beyond the microscope: Identifying specific cancers using molecular analysis
11. Researchers identify new regulator in allergic diseases
Post Your Comments:
(Date:6/3/2016)... 2016 Das DOTM ... Nepal hat ein 44 Millionen ... Kennzeichen, einschließlich Personalisierung, Registrierung und IT-Infrastruktur, an ... und Implementierung von Identitätsmanagementlösungen. Zahlreiche renommierte internationale ... teilgenommen, aber Decatur wurde als konformste und ...
(Date:6/1/2016)... , June 1, 2016 Favorable ... Election Administration and Criminal Identification to Boost Global Biometrics ... recently released TechSci Research report, " Global Biometrics Market ... Competition Forecast and Opportunities, 2011 - 2021", the global ... by 2021, on account of growing security concerns across ...
(Date:5/12/2016)... , May 12, 2016 ... just published the overview results from the Q1 wave ... the recent wave was consumers, receptivity to a program ... data with a health insurance company. "We ... to share," says Michael LaColla , CEO of ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... ... June 27, 2016 , ... Newly created ... services and solutions to the healthcare market. The company's primary focus is on ... sales and marketing strategies that are necessary to help companies efficiently bring their ...
(Date:6/24/2016)... on a range of subjects including policies, debt and investment ... Speaking at a lecture to the Canadian Economics ... the country,s inflation target, which is set by both the ... "In certain areas there needs to be frequent ... not sit down and address strategy together?" He ...
(Date:6/23/2016)... (PRWEB) , ... June 23, 2016 , ... ... the release of its second eBook, “Clinical Trials Patient Recruitment and Retention Tips.” ... and retention in this eBook by providing practical tips, tools, and strategies for ...
(Date:6/23/2016)... June 23, 2016 A person commits a crime, ... scene to track the criminal down. An outbreak ... and Drug Administration (FDA) uses DNA evidence to track down ... Sound far-fetched? It,s not. The FDA has increasingly used ... investigations of foodborne illnesses. Put as simply as possible, whole ...
Breaking Biology Technology: