Navigation Links
Hormone in birth control shot linked to memory loss
Date:11/1/2011

TEMPE, Ariz. The birth control shot Depo Provera offers a convenient alternative for women who don't want to remember to take a daily pill. Ironically, research from Arizona State University has shown the shot actually may impair a person's memory.

The ASU study connects medroxyprogesterone acetate (MPA), the hormone active in Depo Provera and many widely used menopausal hormone therapies, to impaired memory in rodents. The study is currently in press in the journal Psychopharmacology. An early on line version of the article is available at http://www.springerlink.com/content/53357212117581w6/.

The study was led by Blair Braden, an ASU psychology doctoral student, and Heather Bimonte-Nelson, an ASU associate professor of psychology and director of the Bimonte-Nelson Memory and Aging Lab. The work was done in collaboration with Laszlo Prokai from the University of North Texas Health Sciences Center, Fort Worth, Tex., and Alain Simard from Barrow Neurological Institute, Phoenix.

The Bimonte-Nelson lab first linked MPA to memory loss in rats while studying it as a component of hormone therapy for menopause. This earlier study showed that MPA impaired memory in menopausal-aged rats, and results were published in the November 2010 issue of Neurobiology of Learning and Memory. The current study specifically looks at the drug in relation to the birth control shot.

Bimonte-Nelson said she and Braden began asking questions about the effects of the drug because Braden was concerned about friends taking MPA as a contraceptive.

"This is an important question, because what we are going to have in our future are women who are menopausal that also have a history of taking MPA as birth control when they were younger," said Bimonte-Nelson.

The U.S. Food and Drug Administration originally approved Depo Provera for use in October 1992. It requires an injection every 12 weeks. Its 99 percent effectiveness and the infrequency of doses make the shot an attractive alternative for women seeking to avoid pregnancy.

While other studies have examined Depo Provera's effects on bone density, Bimonte-Nelson's lab is the first to explore its effects on cognition. The researchers note that other forms of hormonal contraception, such as the pill, do not use MPA.

The study lasted approximately one year, using three groups of rats (which received doses at varying ages), plus a control group that did not receive the hormone. To test their memory, rats were placed in water-based mazes to swim and seek out hidden platforms in the water.

"What we found was pretty shocking animals that had been given the drug at any point in their life were memory impaired at middle age compared to animals that never had the drug," said Braden. "We also confirmed that in the subjects that only received the drug when young, the hormone was no longer circulating during memory testing when older, showing it had cleared from the system yet still had effects on brain function."

The researchers also measured a marker of the gamma-aminobutyric acid (GABA) neurotransmitter system in the hippocampus of the rats' brains to determine MPA's physiological effects.

"What GABA does is slow the brain down," Braden said. "So if there is too much of it, it can make it more difficult to produce memories. But then if there's too little of it and there's too much excitation, same thing it makes you not able to produce memories correctly."

The group plans to follow the animal studies with human trials, and the work is leading to results that could have profound implications for women of all ages.

"This research shows that even after this hormone is no longer on board, months and months later, resulting effects are impacting the brain and its function," Bimonte-Nelson said. "This work is an important step forward in our understanding of the potentially long-lasting effects of clinically used hormones on brain function. However, more research is needed to determine whether these effects also occur in women that take this hormone as birth control or part of hormone therapy."


'/>"/>

Contact: Skip Derra
skip.derra@asu.edu
480-965-4823
Arizona State University
Source:Eurekalert

Related medicine news :

1. Obese people regain weight after dieting due to hormones
2. Hunger Hormones May Drive Post-Dieting Weight Gain
3. Research involving thyroid hormone lays foundation for more targeted drug development
4. Breast Cancer Risk May Rise With High Hormone Levels
5. Elevated hormone levels add up to increased breast cancer risk
6. Breast tenderness in women getting combo hormone therapy associated with increase in breast density
7. Shift Workers Show Rise in Stress Hormone
8. Is Female Hormone Disorder Tied to Familial Heart Risk?
9. Stress hormones may increase cardiovascular risks for shift workers
10. New bone-targeting drug delays onset of metastases in hormone-resistant prostate cancer patients
11. Pituitary hormone TSH found to directly influence bone growth
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/10/2016)... ... February 10, 2016 , ... Emergency rooms provide emergency care to stabilize critical ... leave patients with dental emergencies at risk of losing a tooth or their smiles. ... , Common dental emergencies include:, , Avulsed or knocked-out ...
(Date:2/10/2016)... ... February 10, 2016 , ... Ongoing news of the ... Care Association™ (ALCA) to conduct a survey that takes a closer look at cases ... illustrates the prevalence and causes of TBI among the aging population, and identifies the ...
(Date:2/10/2016)... ... 2016 , ... AxoGen, Inc. (NASDAQ: AXGN), a leading medical technology company focused ... full year ended December 31, 2015 on Monday, February 29, 2016 after the market ... community following the release at 4:30 PM ET. Investors interested in participating by phone ...
(Date:2/10/2016)... ... ... For additional information contact Phyllis Strupp 480-488-5858 , Brain improves with age, ... Guide to Brain Training" by award-winning author Phyllis Strupp explains how brain ... 16, 2016. A free review copy is available to the media at NetGalley ...
(Date:2/10/2016)... ... February 10, 2016 , ... IDEX Health & ... PEEK-lined stainless steel (PLS) columns combine the strength of traditional stainless steel with ... of biological samples while operating at ultra-high pressures of 20,000 psi. The higher ...
Breaking Medicine News(10 mins):
(Date:2/10/2016)... SUNNYVALE, Calif. , Feb. 10, 2016 /PRNewswire/ ... Warren Kocmond , formerly Executive Vice President ... the position of President and Chief Operating Officer.  ... been expanded, and now include Global Commercial Operations ... and Customer Service.  Mr. Kocmond will continue to ...
(Date:2/10/2016)... Pharmaceuticals Inc. (Vanda) (NASDAQ: VNDA ), today announced ... full year ended December 31, 2015. ... year for Vanda with the continued growth of HETLIOZ ... HETLIOZ for Non-24," said Mihael H. Polymeropoulos, M.D., Vanda,s ... U.S. product portfolio builds on this success and underscores ...
(Date:2/10/2016)... LEXINGTON, Massachusetts , February 10, 2016 --> ... Japan .  --> Japan .  ... Japan .  With submission, Shire continues to ... --> With submission, Shire continues to ... With submission, Shire continues to strengthen ...
Breaking Medicine Technology: