Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cholesterol-lowering drug shrinks enlarged prostates in hamster model

22.10.2010
A cholesterol-lowering drug reduced the enlarged prostates of hamsters to the same extent as a drug commonly used to treat benign prostatic hyperplasia (BPH), report researchers at Children's Hospital Boston and their colleagues in the October issue of the Journal of Urology. Together, the drugs worked even better.

"We don't know the mechanism, but the results suggest to us that lowering cholesterol has the potential to reduce BPH in men," says senior author Keith Solomon, PhD, a biochemist, and member of the departments of Orthopaedic Surgery and Urology at Children's. "This brings up the possibility that other cholesterol lowering therapies, including exercise and diet, may prevent BPH from developing."

For unknown reasons, about half of men older than 50 (and 80 percent of men aged 80) develop BPH, most often evident as enlargement of the prostate. BPH leads to difficult urination, urgency, pain, and other symptoms that can cause significant reduction in the quality of life. In advanced stages, BPH can lead to renal failure. Standard medical and surgical treatments typically target the prostate and usually result in a reduction of symptoms but not without significant side effects in some men, Solomon said.

The study implicates circulating cholesterol in the progression of the condition and suggests a potential new strategy for prevention and treatment. The latest findings emerge from experiments with a strain of Syrian hamsters that undergo prostate enlargement naturally.

Led by first author Kristine Pelton, the team tested ezetimibe, an FDA-approved hypercholesterolemic drug (Zetia; Merck) against finasteride (Proscar, Propecia; Merck), a standard therapy for the treatment of BPH. Ezetimibe reduced prostatic enlargement in aged hamsters as effectively as finasteride and combining the two drugs worked better than either one alone.

In an unexpected finding, pathologist and co-author Dolores Di Vizio, MD, PhD, observed that finasteride caused atrophy of the hamster prostate while ezetimibe did not. "These findings provide strong evidence that the cholesterol-lowering drug inhibits BPH by a novel mechanism," said co-author Michael R. Freeman, PhD, professor of Surgery and director of urologic research at Children's Hospital.

The potentially therapeutic effect of cholesterol-lowering on enlarged prostates was pioneered 40 years earlier by co-author Carl Schaffner, PhD, professor emeritus at Rutgers University, who reported similar results in pre-clinical models using a different cholesterol-lowering drug.

"There is a lot more we want to do in the lab, with regards to studying BPH and the use of cholesterol-based therapies to control disease progression," says Solomon.

For example, the researchers want to test lower doses of ezetimibe and finasteride to examine whether the condition can be reversed with fewer side effects. They also want to assess prophylactic cholesterol lowering to determine if the enlargement can be prevented, and whether genes and proteins mediating the effect of cholesterol on the prostate can be identified. "We really want to be in the position to help conduct a clinical trial to test whether this therapy might have efficacy in human patients," Solomon said.

The study also validated the hamster strain as a good preclinical model for testing novel BPH therapies. "The preclinical models for BPH are few, require substantial manipulation or have an unpredictable disease course," Solomon says. "The Syrian hamster model that we are now using seems particularly good for examining the role of cholesterol in prostate disease, and the testing of novel drug therapies to help alleviate symptoms. We should be able to make substantial progress in developing new treatments and in understanding the molecular mechanisms underpinning the disease using these hamsters."

The study was funded by the National Institutes of Health and a grant from the Hyde and Watson Foundation.

Study links:

Ezetimibe reduces enlarged prostate in an animal model of benign prostatic hyperplasia, Journal of Urology, October 2010

Children's Hospital Boston is home to the world's largest research enterprise based at a pediatric medical center, where its discoveries have benefited both children and adults since 1869. More than 1,100 scientists, including nine members of the National Academy of Sciences, 12 members of the Institute of Medicine and 13 members of the Howard Hughes Medical Institute comprise Children's research community. Founded as a 20-bed hospital for children, Children's Hospital Boston today is a 392-bed comprehensive center for pediatric and adolescent health care grounded in the values of excellence in patient care and sensitivity to the complex needs and diversity of children and families. Children's also is the primary pediatric teaching affiliate of Harvard Medical School.

Keri Stedman | EurekAlert!
Further information:
http://www.childrenshospital.org/

More articles from Health and Medicine:

nachricht Cystic fibrosis alters the structure of mucus in airways
28.06.2017 | University of Iowa Health Care

nachricht Mice provide insight into genetics of autism spectrum disorders
28.06.2017 | University of California - Davis

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: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Supersensitive through quantum entanglement

28.06.2017 | Physics and Astronomy

X-ray photoelectron spectroscopy under real ambient pressure conditions

28.06.2017 | Physics and Astronomy

Mice provide insight into genetics of autism spectrum disorders

28.06.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>