Navigation Links
Easter Island drug raises cognition throughout life span
Date:6/29/2012

SAN ANTONIO, Texas, U.S.A. (June 29, 2012) -- Cognitive skills such as learning and memory diminish with age in everyone, and the drop-off is steepest in Alzheimer's disease. Texas scientists seeking a way to prevent this decline reported exciting results this week with a drug that has Polynesian roots.

The researchers, appointed in the School of Medicine at The University of Texas Health Science Center San Antonio, added rapamycin to the diet of healthy mice throughout the rodents' life span. Rapamycin, a bacterial product first isolated from soil on Easter Island, enhanced learning and memory in young mice and improved these faculties in old mice, the study showed.

"We made the young ones learn, and remember what they learned, better than what is normal," said Veronica Galvan, Ph.D., assistant professor of physiology at the Barshop Institute for Longevity and Aging Studies, part of the UT Health Science Center. "Among the older mice, the ones fed with a diet including rapamycin actually showed an improvement, negating the normal decline that you see in these functions with age."

The drug also lowered anxiety and depressive-like behavior in the mice, Dr. Galvan said. Anxiety and depression are factors that impair human cognitive performance. Lead author Jonathan Halloran conducted scientifically reliable tests to accurately measure these cognitive components in the rodents.

Venturing into the open

Mice are burrowers that prefer tunnels with walls. To observe behavior, Halloran used an elevated maze of tunnels that led to a catwalk. "All of a sudden the mice are in open space," Halloran said. "It's pretty far from the floor for their size, sort of like if a person is hiking and suddenly the trail gets steep. It's pretty far down and not so comfortable."

Mice with less anxiety were more curious to explore the catwalk. "We observed that the mice fed with a diet containing rapamycin spent significantly more time out in the open arms of the catwalk than the animals fed with a regular diet," Halloran said.

The second test measured depressive-like behavior in the rodents. Mice do not like to be held by their tails, which is the way they are moved from cage to cage. Inevitably they struggle to find a way out. "So we can measure how much and how often they struggle as a measure of the motivation they have to get out of an uncomfortable situation," Dr. Galvan said.

Rapamycin acts like an antidepressant

Some mice barely struggle to get free, but if an antidepressant is administered they struggle a lot more. This behavior is very sensitive to the action of antidepressants and is a reliable measure of whether a drug is acting like an antidepressant, Dr. Galvan said.

"We found rapamycin acts like an antidepressant it increases the time the mice are trying to get out of the situation," she said. "They don't give up; they struggle more."

The reductions of anxiety and depressive-like behavior in rapamycin-treated mice held true for all ages tested, from 4 months of age (college age in human years) to 12 months old (the equivalent of middle age) to 25 months old (advanced age).

Feel-good chemicals elevated

The researchers measured levels of three "happy, feel-good" neurotransmitters: serotonin, dopamine and norepinephrine. All were significantly augmented in the midbrains of mice treated with rapamycin. "This is super-interesting, something we are going to pursue in the lab," Dr. Galvan said.

Dr. Galvan and her team published research in 2010 showing that rapamycin rescues learning and memory in mice with Alzheimer's-like deficits. The elevation of the three neurotransmitters, which are chemical messengers in the brain, may explain how rapamycin accomplished this, Dr. Galvan said.

Rapamycin is an antifungal agent administered to transplant patients to prevent organ rejection. The drug is named for Rapa Nui, the Polynesian title for Easter Island. This island, 2,000 miles from any population centers, is the famed site of nearly 900 mysterious monolithic statues.


'/>"/>

Contact: Will Sansom
sansom@uthscsa.edu
210-567-2579
University of Texas Health Science Center at San Antonio
Source:Eurekalert  

Related medicine news :

1. Ritual in Some Jewish Circumcisions Raises Risk of Herpes Infection: Report
2. Presence of fetal cells in women lowers risk of breast cancer but raises risk of colon cancer
3. Stopping Blood Thinners Raises Stroke Risk for Patients With Irregular Heartbeat
4. Feeling Trapped, Obligated Raises Odds of Job Burnout: Study
5. GMCSF treatment associated with improved cognition in cancer patients
6. Tai Chi increases brain size, benefits cognition in randomized controlled trial of Chinese elderly
7. ACP-New York State Chapter partnership results in patient safety organization recognition
8. AGA announces prestigious awards recognition recipients
9. Kessler Foundation researchers present at first International Congress on Cognition in MS
10. Presidential Recognition Awards presented during the 2012 AIUM Annual Convention
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Easter Island drug raises cognition throughout life span
(Date:2/12/2016)... MIAMI, FLA (PRWEB) , ... February 12, 2016 , ... ... free dental implants to their Miami dental office. Beginning in January, Miami Dental ... traditional titanium. Miami Dental Specialists are the first office to be chosen by the ...
(Date:2/12/2016)... ... February 12, 2016 , ... Mediaplanet today ... , The print component of “Revolutionizing Cancer Care” is distributed within the February ... and Seattle, with a circulation of approximately 250,000 copies and an estimated readership ...
(Date:2/12/2016)... ... February 12, 2016 , ... Homeowners now have ... possibilities. CertainTeed, North America’s leading brand of building products, has improved upon its ... in the mobile version of the ColorView® Exterior Style and Color Selector. Created ...
(Date:2/12/2016)... ... 12, 2016 , ... Healthcare careers in the medical laboratory, nursing, and in ... website of healthcare staffing leader Aureus Medical Group during the month of January. Aureus ... therapy positions and in travel and direct hire opportunities in other allied health ...
(Date:2/12/2016)... ... ... Yisrayl Hawkins, Pastor and Overseer at The House of Yahweh in Abilene, Texas, ... real facts surrounding all those Bible stories. For generations families have gathered to hear ... says there is more to these than just mere “stories”. , The article ...
Breaking Medicine News(10 mins):
(Date:2/11/2016)... 2016 Stem cells are primitive cells found ... and the capacity to differentiate into mature cell types ... the first mouse embryonic stem cells were derived from ... that the first culturing of embryonic stem cells from ... produced until 2006 As a result of these discoveries, ...
(Date:2/11/2016)... 11, 2016  Kindred Biosciences, Inc. (NASDAQ: KIN ... the lives of pets, today announced the submission to ... Animal Drug Application (NADA) for Zimeta™ (dipyrone injection, KIND-012).  ... of Zimeta for the control of pyrexia (fever) in ... --> --> The Chemistry, Manufacturing, ...
(Date:2/11/2016)... , Feb. 11, 2016   Health 2.0 ... of new health technologies, announced today " 10 Year ... in health tech over the past ten years.   ... nearly a decade, Health 2.0 has served as the ... and connected with thousands of technologies, companies, innovators, and ...
Breaking Medicine Technology: