Navigation Links
Targeted cancer therapy kills prostate tumor cells
Date:6/6/2011

A new targeted therapy for prostate cancer halts tumor growth in animals with advanced prostate cancer that is resistant to hormone therapy, a new study finds. The results will be presented Saturday at The Endocrine Society's 93rd Annual Meeting in Boston.

"This targeted therapy may provide a treatment breakthrough that will extend the lives of men with advanced, hormone-refractory prostate cancer," said lead investigator Shuk-mei Ho, PhD, chairwoman of the Department of Environmental Health at the University of Cincinnati.

Men with prostate cancer that has recurred or has spread outside the prostate routinely receive androgen deprivation therapy, which blocks the action of the male hormones. This castration occurs through surgical removal of both testes or more often with medications. Although effective, this hormone-blocking treatment eventually stops working in some patients, Ho said.

"These patients are left with very few treatment options and usually succumb quickly to the disease," she said.

Ho's team previously found they can inhibit the growth of prostate cancer cell lines in culture by targeting and activating a protein called G protein-coupled receptor 30 (GPR30) using the experimental drug G-1, a GPR30 agonist, or stimulator.

In their new study, funded by the Veterans Affairs and the National Institutes of Health, Ho and her co-workers tested G-1 in an animal model of castration-resistant prostate cancer. They implanted human prostate cancer cells beneath the skin of male mice. The established tumor regressed upon castration and after the cancer relapsed, they injected the mice with a low dose of G-1. They also gave G-1 to noncastrated, or "intact," male mice that had prostate tumors. In these intact mice that still had male hormones, G-1 did not stop growth of the prostate tumors or cause substantial death of tumor cells (necrosis), they found.

"Surprisingly, G-1 was highly effective in halting the growth of the tumors that re-emerged after castration," Ho said.

The castration-resistant tumors showed a 65 percent necrosis. These mice had increased expression of GPR30 after castration, which Ho believes sensitized prostate tumors to the cell growth-inhibiting effects of G-1.

"These results mean G-1 won't work without androgen deprivation therapy," she said.

Therefore, Ho reported, the window of time when this targeted therapy might be effective for treating hormone-resistant prostate cancer is after androgen deprivation therapy. She said she believes G-1 can make androgen blockade more effective. G-1 caused no harm to the prostate or other vital organs in mice, she added.

Although GPR30 may have a role in cell growth in female tissues, Ho said it appears to have the opposite effect in men with hormone-resistant prostate cancer. "The beauty of this GPR30 is that it does not have any estrogen, and so it will not cause any side effects of estrogen," she said.


'/>"/>

Contact: Aaron Lohr
alohr@endo-society.org
240-482-1380
The Endocrine Society
Source:Eurekalert

Related medicine news :

1. Targeted delivery of losartan reduces liver inflammation and scarring
2. Gene-Targeted Cancer Fix Could Be a Breakthrough
3. Survival in metastatic breast cancer patients is improving: targeted therapies have contributed
4. Targeted agent blocked growth of deadly brain cancer in preclinical studies
5. Kaiser Permanente Southern California to Offer FitOrbit Online Personal Training to Targeted Patients
6. New targeted therapy effective in treating advanced prostate cancer
7. Gene-Targeted Therapy Might Help Prevent Paralysis
8. Site Steering Launches Keyword Targeted Small Business Internet Video Advertising Program That Achieves First Page Search Results Within Days
9. Drug in new class of targeted therapies shows early promise against blood-related cancers
10. Women Smokers Targeted on World No Tobacco Day
11. Targeted immunotherapy shows promise for metastatic breast, pancreatic cancers
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/28/2016)... ... May 28, 2016 , ... SuperCloset is proud to officially launch our ... to day issues, struggles and obstacles veterans’ need to overcome in order to face ... active or retired military veteran(s) with a donated SuperCloset product based on the needs ...
(Date:5/28/2016)... ... ... After a year and a half of planning the Multiple Pathways of Recovery Conference ... of Recovery Conference was held May 2 -4, 2016 at the Mystic Marriott Hotel ... to explore the many pathways individuals use to get into and sustain their recovery. ...
(Date:5/27/2016)... ... ... Southland Log Homes , designer and manufacturer of America’s Favorite Log ... be found on its website at SouthlandLogHomes.com. , The designs of the wood ... craftsmanship of timber post and beam construction. The result is a barn that ...
(Date:5/27/2016)... ... May 27, 2016 , ... An influential resource amongst nurses and ... to shed lights on the variety of topics detailing why we appreciate nurses in ... why this career has gone from being in a major recession to one of ...
(Date:5/27/2016)... New York, NY (PRWEB) , ... May 27, ... ... caregivers to casual readers, this installment is bolstered by inspiring human-interest stories, courtesy ... trends and tech within the industry, from leading advocates, associations and industry leaders ...
Breaking Medicine News(10 mins):
(Date:5/24/2016)... 24, 2016 ARANZ Medical  Ltd ... healthcare sector, has been named the Coretex Hi-Tech Emerging Company ... Dr Bruce Davey , CEO of ARANZ ...  It,s really good to be recognised for the work we ... are used in 35 countries around the world from Sub-Saharan ...
(Date:5/24/2016)... 24, 2016 Celsion Corporation (NASDAQ: ... today provided an update on its ongoing OVATION ... combining GEN-1, the Company,s DNA-based immunotherapy, with the ... patients with advanced ovarian cancer who will undergo ... is an IL-12 DNA plasmid vector formulated as ...
(Date:5/24/2016)... KONG , May 24, 2016 ... , the world , s first ... AV fistula intervention   OrbusNeich, a global ... has expanded its portfolio to include products to treat ... are the company,s first entry devices for lower limb ...
Breaking Medicine Technology: