Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Breast cancer drug fights fungal disease

11.02.2014
Tamoxifen, a drug currently used to treat breast cancer, also kills a fungus that causes a deadly brain infection in immunocompromised patients.

The findings, which could lead to new treatments for a disease that kills more HIV/AIDS patients than tuberculosis, appear in mBio®, the online open-access journal of the American Society for Microbiology (ASM.)

"This work sets the stage for additional animal studies to see if tamoxifen can be used as a drug in people and will allow us to design new drugs related to tamoxifen that are better antifungals," says Damian Krysan of the University of Rochester, an author on the study.

Cryptococcosis is one of the most prevalent human fungal infections, responsible for approximately 1 million new infections and 620,000 deaths worldwide each year. The disease strikes primarily people living with HIV/AIDS and causes more deaths in this population than tuberculosis. It manifests as either pneumonia or a brain infection known as meningoencephalitis.

"The gold standard therapy for this infection is a combination of amphotericin B and 5-flucytosine. These drugs were first used in the late 1950s when penicillin was the antibiotic of choice. There have been no substantial improvements in the treatment of this disease in a half-century and the therapy is not available in many regions of the world that need it most," says Krysan.

In areas of the world where the gold-standard therapy is not available, like sub-Saharan Africa, the drug of choice is fluconazole because it is widely available and inexpensive. Unfortunately, it is much less effective since it does not actually kill the fungus.

"Recently, interest in re-using old drugs to treat new diseases has increased as a way to develop new therapies more quickly. We screened a large collection of old drugs for drugs that kill Cryptococcus and rediscovered tamoxifen," says Krysan. "We used clinical microbiology tests to determine whether the molecules had promising activity against Cryptococcus both alone and in combination with other antifungal drugs such as fluconazole. The combination of tamoxifen and fluconazole was synergistic; this means that the combination is more than 4-times more active than either alone."

Krysan and his colleagues also demonstrated that tamoxifen does not kill the fungus in the same way it works against breast cancer. Instead, it inhibits proteins related to calmodulin, an important calcium binding protein. They found that by making modifications to tamoxifen that improve its ability to interfere with calmodulin, they also improved its ability to kill Cryptococcus.

"An effective, widely available treatment for cryptococcal meningitis is an unmet clinical need of global importance," says Krysan. "These results indicate that tamoxifen is a pharmacologically attractive scaffold for the development of new anti-cryptococcal drugs and provide a mechanistic base for its further optimization."

mBio® is an open access online journal published by the American Society for Microbiology to make microbiology research broadly accessible. The focus of the journal is on rapid publication of cutting-edge research spanning the entire spectrum of microbiology and related fields. It can be found online at http://mbio.asm.org.

The American Society for Microbiology is the largest single life science society, composed of over 39,000 scientists and health professionals. ASM's mission is to advance the microbiological sciences as a vehicle for understanding life processes and to apply and communicate this knowledge for the improvement of health and environmental and economic well-being worldwide.

Jim Sliwa | EurekAlert!
Further information:
http://www.asmusa.org

More articles from Health and Medicine:

nachricht A human respiratory tissue model to assess the toxicity of inhaled chemicals and pollutants
26.03.2015 | R&D at British American Tobacco

nachricht Sci-Fly study explores how lifeforms know to be the right size
26.03.2015 | Cincinnati Children's Hospital Medical Center

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Experiment Provides the Best Look Yet at 'Warm Dense Matter' at Cores of Giant Planets

In an experiment at the Department of Energy's SLAC National Accelerator Laboratory, scientists precisely measured the temperature and structure of aluminum as...

Im Focus: Energy-autonomous and wireless monitoring protects marine gearboxes

The IPH presents a solution at HANNOVER MESSE 2015 to make ship traffic more reliable while decreasing the maintenance costs at the same time. In cooperation with project partners, the research institute from Hannover, Germany, has developed a sensor system which continuously monitors the condition of the marine gearbox, thus preventing breakdowns. Special feature: the monitoring system works wirelessly and energy-autonomously. The required electrical power is generated where it is needed – directly at the sensor.

As well as cars need to be certified regularly (in Germany by the TÜV – Technical Inspection Association), ships need to be inspected – if the powertrain stops...

Im Focus: 3-D satellite, GPS earthquake maps isolate impacts in real time

Method produced by UI researcher could improve reaction time to deadly, expensive quakes

When an earthquake hits, the faster first responders can get to an impacted area, the more likely infrastructure--and lives--can be saved.

Im Focus: Atlantic Ocean overturning found to slow down already today

The Atlantic overturning is one of Earth’s most important heat transport systems, pumping warm water northwards and cold water southwards. Also known as the Gulf Stream system, it is responsible for the mild climate in northwestern Europe. 

Scientists now found evidence for a slowdown of the overturning – multiple lines of observation suggest that in recent decades, the current system has been...

Im Focus: Robot inspects concrete garage floors and bridge roadways for damage

Because they are regularly subjected to heavy vehicle traffic, emissions, moisture and salt, above- and underground parking garages, as well as bridges, frequently experience large areas of corrosion. Most inspection systems to date have only been capable of inspecting smaller surface areas.

From April 13 to April 17 at the Hannover Messe (hall 2, exhibit booth C16), engineers from the Fraunhofer Institute for Nondestructive Testing IZFP will be...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

World Conference On Regenerative Medicine 2015: Registration And Abstract Submission Now Open

25.03.2015 | Event News

University presidents from all over the world meet in Hamburg

19.03.2015 | Event News

10. CeBiTec Symposium zum Big Data-Problem

17.03.2015 | Event News

 
Latest News

Surface-modified nanoparticles endow coatings with combined properties

26.03.2015 | Trade Fair News

Novel sensor system provides continuous smart monitoring of machinery and plant equipment

26.03.2015 | Trade Fair News

Common bacteria on verge of becoming antibiotic-resistant superbugs

26.03.2015 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>