Navigation Links
Of mice and men: new male contraceptives successful in rodents and humans
Date:9/28/2007

Pills, sponges, IUDs, diaphragms-- women have many options for planning their fertility, none of them quite perfect. But what if men want to help out? They have only two options -- vasectomy, which is usually permanent, and condoms, which are crucial for dating but get old in long-term relationships. Will men ever have a way to reliably make sure that nobody is every calling them "Daddy" before they are ready?

For decades, pundits have predicted new contraceptives for men within the next 5 to 10 years. But judging from work presented today at the second "Future of Male Contraception" conference, we may finally be getting closer. Some highlights from the second day of the conference:

- Researchers from the University of Washington tried a hormone regimen based on two products already available on the market. They used testosterone gel, which is marketed for men with low testosterone, plus a progestin shot used as a female contraceptive under the name "DepoProvera." The men got a shot once every 3 months and rubbed on a gel every day, and it worked well at knocking out sperm in 90% of them. However, men's opinions of the method varied widely: 6 dropped out, and of the remaining 38, half of them were satisfied or very satisfied, a third were dissatisfied or very dissatisfied, and the rest were undecided or had mixed feelings.

- Shepherd Medical Company announced the results of their very first U.S. study in men of the "Intra Vas Device" (a vasectomy alternative): after 6 months, 92% of the men had no sperm or almost no sperm. The Intra Vas Device blocks sperm in the vas deferens, the tube sperm swim through (the same tube that is cut in vasectomy). The set of plugs can be removed if a man changes his mind, so it is much easier to get sperm flowing again than after vasectomy. Animal studies have shown that fertility returns if the IVD is removed after short-term use, but that doesn't guarantee successful pregnancy after long-term use. The next step will be to find funding for long-term studies of effectiveness and fertility return.

- Columbia University researchers took advantage of the importance of vitamin A to design a new contraceptive approach. Men who are extremely low in vitamin A lose their fertility-- but they also become extremely sick, so avoiding vitamin A doesn't work as a contraceptive. Instead, Professor Debra Wolgemuth discovered a drug that had been abandoned by a pharmaceutical company precisely because it interfered with vitamin A receptors in the testes. Her team tested it in mice, and it worked with no health effects. "The receptors are everywhere, but the testis is exquisitely sensitive to the drug. So we can use a dose that is so low it has no effect on the rest of the body."

So the drug doesn't harm mice-- but will it be fine in men" Dr. Wolgemuth thinks the chances are good. "There's extensive toxicology data in rats and rabbits -- and at much higher doses-- because industry is developing it for other uses. So we're optimistic that there would be no adverse side effects in humans as well."

So how long must we wait? Advocates say it all depends on men speaking up. "We've seen today that the pipeline is full-- everything from new targets to actual human trials," explains Kirsten Thompson, director of the International Male Contraception Coalition. "And the demand is there-- hundreds of men have voiced their opinion on our website MaleContraceptives.org and in surveys. So it's just a question of whether policymakers act on that demand." Elaine Lissner, director of the Male Contraception Information Project, concurs. "We could have something like the IVD on the market in 4-5 years, if we make an all-out effort with funding and focus. But if we continue with just a study here and a study there, it could be an eternity."


'/>"/>

Contact: Elaine Lissner
415-839-6304
Male Contraception Information Project
Source:Eurekalert

Related biology technology :

1. Keys to Successful Densitometry
2. Critical factors for successful microarray and real-time PCR analyses
3. Successful PCR amplification and subcloning of a GC-rich DNA fragment
4. General Considerations for Successful Transfection Experiments
5. Designing a Successful qRT-PCR Experiment
6. Precursor miRNAs for Successful miRNA Functional Studies
7. Recommendations for Successful siRNA Library Screens
8. Setting up Successful siRNA Library Screens
9. Successful stabilization of gene expression profiles
10. Business Plan Contest produces successful grads
11. Embracing failure is a necessary step for successful entrepreneurs
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/23/2016)... , June 23, 2016  The Prostate Cancer Foundation (PCF) ... precise treatments and faster cures for prostate cancer. Members of the Class of ... 15 countries. Read More About the Class of 2016 ... ... ...
(Date:6/23/2016)... ... ... Supplyframe, the Industry Network for electronics hardware design and ... in Pasadena, Calif., the Design Lab’s mission is to bring together inventors and ... brought to market. , The Design Lab is Supplyframe’s physical representation of one ...
(Date:6/23/2016)... 23, 2016 Apellis Pharmaceuticals, Inc. today ... trials of its complement C3 inhibitor, APL-2. The ... ascending dose studies designed to assess the safety, ... injection in healthy adult volunteers. Forty ... a single dose (ranging from 45 to 1,440mg) ...
(Date:6/23/2016)... June 23, 2016 On Wednesday, June ... 4,833.32, down 0.22%; the Dow Jones Industrial Average edged 0.27% ... at 2,085.45, down 0.17%. Stock-Callers.com has initiated coverage on the ... Nektar Therapeutics (NASDAQ: NKTR ), Aralez Pharmaceuticals Inc. ... BIND ). Learn more about these stocks by ...
Breaking Biology Technology:
(Date:6/2/2016)... -- The Department of Transport Management (DOTM) of ... US Dollar project, for the , Supply and ... and IT Infrastructure , to Decatur ... of Identity Management Solutions. Numerous renowned international vendors participated in ... was selected for the most compliant and innovative solution. ...
(Date:6/2/2016)... 2, 2016 Perimeter Surveillance & ... Systems, Physical Infrastructure, Support & Other Service  ... offers comprehensive analysis of the global Border ... generate revenues of $17.98 billion in 2016. ... a leader in software and hardware technologies for advanced ...
(Date:5/24/2016)... Ampronix facilitates superior patient care by providing unparalleled technology to leaders of the medical ... premium product recently added to the range of products distributed by Ampronix. ... ... ... Ampronix News ...
Breaking Biology News(10 mins):