Navigation Links
Scientists ID Brain Pathway That Stops Seizures
Date:6/8/2008

Mouse study finds gene affects acids that regulate severity of convulsions

SUNDAY, June 8 (HealthDay News) -- A brain pathway that stops seizures has been found by Iowa researchers.

Applying modern genetics and molecular biology to clinical observations made more than 80 years ago, a team from the University of Iowa and the Veterans Affairs Iowa City Health Care System found that increased acid (pH) activates an ion channel in the brain that shuts down seizure activity. The findings were expected to be published online June 8 in Nature Neuroscience.

"Although this work provides insight into how seizures normally stop and might help us learn more about how to terminate those seizures that don't stop, it will take more work to turn the finding into a new therapeutic approach," senior study author Dr. John Wemmie, an assistant professor of psychiatry in the University of Iowa's Roy J. and Lucille A. Carver College of Medicine, said in a prepared statement. "We will be working with colleagues in neurology and neurosurgery to try and translate the findings to treatments."

Clinical experiments from the first half of the 20th century show breathing carbon dioxide, which creates more acid in brain tissue, helps stop epileptic seizures while the seizures themselves lower brain pH. The modern discovery of an acid-activated ion channel (ASIC1a) in the brain helped the team piece the puzzle together.

"We found that ASIC1a does not seem to play a role in how a seizure starts, but as the seizure continues, and the pH is reduced, ASIC1a appears to play a role in stopping additional seizure activity," study co-lead author Adam Ziemann, a student in the Medical Scientist Training Program at the university, said in a prepared statement.

Researchers found that seizures are more severe and longer in mice lacking the ASIC1a gene than those with the gene. Also, chemically blocking ASIC1a causes the seizures to be longer and more severe in mice with the gene, while increasing ASIC1a in mice protects them from severe seizures.

"One of the most exciting aspects of the work is that it highlights the potent anti-epileptic effects of acid in the brain -- effects that have been recognized for nearly 100 years but until recently have been poorly understood -- and it identifies ASIC1a as a key player in mediating the anti-epileptic effect of low pH," Ziemann said.

Seizures occur when brain neurons work out of synch, causing physical spasms or convulsions and even disrupting vital functions, such as breathing. Most seizures stop by themselves, but if they don't, a life-threatening condition called status epilepticus that claims a mortality rate of up to 20 percent could occur.

It is thought that 2 percent to 4 percent of people will have a seizure at some time. People who have epilepsy experience repeated seizure activity.

More information

The U.S. National Library of Medicine has more about seizures.



-- Kevin McKeever



SOURCE: University of Iowa, news release, June 8, 2008


'/>"/>
Copyright©2008 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. New prion protein discovered by Canadian scientists may offer insight into mad cow disease
2. Scientists Probe Sepsis Deadly Secrets
3. Scientists puzzled by severe allergic reaction to cancer drug in the middle Southern US
4. Scientists Develop Natural Protection for Stored Foods
5. Scientists detect presence of marburg virus in african fruit bats
6. Scientists Spot Brains Free Will Center
7. Scientists ID Likely Culprit in Popcorn Lung
8. Scientists explain how insulin secreting cells maintain their glucose sensitivity
9. Scripps Research scientists shed new light on how antibodies fight HIV
10. Scientists, physicians present latest findings in personalized cancer treatment and prevention
11. Scientists demonstate link between genetic variant and effectiveness of smoking cessation meds
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/26/2016)... North Carolina (PRWEB) , ... June 26, 2016 , ... ... release of a new product that was developed to enhance the health of felines. ... for centuries. , The two main herbs in the PawPaws Cat Kidney Support ...
(Date:6/26/2016)... ... June 26, 2016 , ... Many ... been diagnosed with endometriosis. These women need a treatment plan to not only ... approach that can help for preservation of fertility and ultimately achieving a pregnancy. ...
(Date:6/25/2016)... ... June 25, 2016 , ... Austin residents seeking Mohs surgery ... of Mohs Surgery and to Dr. Russell Peckham for medical and surgical dermatology. , ... for skin cancer. The selective fellowship in Mohs Micrographic Surgery completed by Dr. Dorsey ...
(Date:6/25/2016)... ... ... "With 30 hand-drawn hand gesture animations, FCPX users can easily customize each ... Film Studios. , ProHand Cartoon’s package transforms over 1,300 hand-drawn pictures into hand ... select a ProHand generator and drag it above media or text in the Final ...
(Date:6/25/2016)... Long Beach, CA (PRWEB) , ... June 25, 2016 , ... ... from UCLA with Magna Cum Laude and his M.D from the David Geffen School ... San Diego and returned to Los Angeles to complete his fellowship in hematology/oncology at ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... 23, 2016 Research and Markets ... Market by Type (Organic Chemical (Sugar, Petrochemical, Glycerin), Inorganic ... Coating, Parenteral) - Global Forecast to 2021" report ... The global pharmaceutical excipients market is projected to ... of 6.1% in the forecast period 2016 to 2021. ...
(Date:6/23/2016)... -- Research and Markets has announced the addition ... to their offering. The ... commercial environment for MedImmune to enter. The US ageing population ... to drive considerable growth for effective anti-influenza medications. The introduction ... considerably, but development is still in its infancy. ...
(Date:6/23/2016)... June 23, 2016 Revolutionary technology ... Oticon , industry leaders in advanced audiology and ... Oticon Opn ™, the world,s first internet connected ... for IoT devices.      (Photo: http://photos.prnewswire.com/prnh/20160622/382240 ... a number of ,world firsts,: , TwinLink™ ...
Breaking Medicine Technology: