Navigation Links
PD-like sleep and motor problems observed in α-synuclein mutant mice
Date:6/7/2013

Amsterdam, NL, 7 June 2013 The presence of Lewy bodies in nerve cells, formed by intracellular deposits of the protein α-synuclein, is a characteristic pathologic feature of Parkinson's Disease (PD). In the quest for an animal model of PD that mimics motor and non-motor symptoms of human PD, scientists have developed strains of mice that overexpress α-synuclein. By studying a strain of mice bred to overexpress α-synuclein via the Thy-1 promoter, scientists have found these mice develop many of the age-related progressive motor symptoms of PD and demonstrate changes in sleep and anxiety. Their results are published in the latest issue of Journal of Parkinson's Disease.

PD is the second most common neurodegenerative disorder in the United States, affecting approximately one million Americans and five million people worldwide. Its prevalence is projected to double by 2030. The most obvious symptoms are movement-related, such as involuntary shaking and muscle stiffness; non-motor symptoms, such as increases in anxiety and sleep disturbances, can appear prior to the onset of motor symptoms. Although the drug levodopa can relieve some symptoms, there is no cure intensifying the pressure to find an animal model that can help clarify the pathological processes underlying human PD and find new medications to treat the pathology and/or relieve symptoms.

Investigators at the National Institute on Aging compared wild type mice with specially bred mice that were transgenic for the A53T mutation of the human α-synuclein (SNCA) gene under the control of a human thymus cell antigen 1, theta (THY-1) promoter. As the mice aged, their motor performance on a rotarod test (which measures how long the mouse can remain on a rotating rod) became impaired and the length of their strides were significantly shorter than the wild type control mice.

The study also found that SNCA mice displayed fragmented nighttime activity patterns compared to wild type controls and appeared to have a reduced overall sleep time. "Despite the prevalence of abnormal sleep patterns in PD, very few studies to date have outlined sleep disturbances in animal models of PD," says Sarah M. Rothman, PhD, a researcher with the National Institute on Aging, in Baltimore, MD.

Many PD patients typically show an increase in anxiety and depression, and in this respect the SNCA mouse model did not replicate the human condition. SNCA mice displayed an early and significant decrease in anxiety-like behavior that persisted throughout their lifespan, as shown by both open field and elevated plus maze tests (in which mice have the choice of spending time in open or closed arms of a maze). Other rodent models that utilize changes in expression of α-synuclein have also reported lower anxiety levels. The authors suggest that higher levels of serotonin found in the hypothalamus of the SNCA mice may be associated with the reduced anxiety observed.

The authors say it is important to remember that the SNCA "model utilizes the presence of a mutation that only occurs very rarely in PD. While all PD patients display α-synuclein pathology, they do not all express the mutated form of the protein," says Dr. Rothman.


'/>"/>

Contact: Daphne Watrin
d.watrin@iospress.nl
31-206-883-355
IOS Press
Source:Eurekalert

Related medicine news :

1. Coffee Drinking in Pregnancy Wont Lead to Sleepless Baby: Study
2. Disrupted Sleep May Raise Risk for Obesity, Diabetes: Study
3. Depressed moms behavior may play role in infants sleep problems
4. Depressed Moms May Hinder Babies Sleep
5. Poor Sleep Heightens Ringing Ear Disease Symptoms: Study
6. Adjusting Your Attitude About Chronic Pain May Help You Sleep
7. Excessive sleepiness may be cause of learning, attention and school problems
8. Study: Kids Who Sleep in Parents Bed Less Likely to Be Overweight
9. Sleepwalking in Adults More Common Than Thought
10. Pediatric epilepsy impacts sleep for the child and parents
11. Parents Often Lose Sleep Over Childs Epilepsy, Study Finds
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/25/2016)... ... May 25, 2016 , ... The Bank of America Charitable Foundation has ... help provide veterans a pathway to employment and successful careers in healthcare. On Wednesday, ... Nick Hallack, President and CEO of Medisend, parent organization and home of the General ...
(Date:5/25/2016)... ... May 25, 2016 , ... New studies published today ... workers across 15 states. The outcomes examined in these studies include recovery of ... and satisfaction with medical care. , “The goal of the studies is to ...
(Date:5/25/2016)... ... 2016 , ... Today Omega Institute, a leading destination for yoga education in ... opportunities in the growing field of yoga therapy . Yoga therapy adapts ... specific health issues—including injuries, illnesses, and temporary or chronic health conditions. , “Yoga therapy ...
(Date:5/25/2016)... Washington, D.C (PRWEB) , ... May 25, 2016 ... ... of family planning services and products in the developing world, is pleased to ... couples, helped prevent over 5 million unwanted pregnancies, almost 14,000 maternal deaths and ...
(Date:5/25/2016)... ... May 25, 2016 , ... ... supporting the real time adjudication of medical service claims by Pharmacy Benefit Managers ... current medical claims management software. The TransactRx Cross Benefit Clearinghouse receives standard professional ...
Breaking Medicine News(10 mins):
(Date:5/23/2016)... Non-invasive diagnostic test realizes the ... ,Technology to be presented at Yissum’s booth, at IATI-BIOMED ... Company of the Hebrew University of Jerusalem announced ... Aurum Ventures MKI, the technology investment arm of Morris ... approach for early detection of multiple diseases by analyzing ...
(Date:5/23/2016)... -- Gamida Cell, a leader in cellular ... orphan genetic diseases, announced today it has been awarded ... Israel Innovation Authority (formerly the Office of the Chief ... The mission of the Israel Innovation Authority is to ... and technology, while stimulating economic growth. The ...
(Date:5/23/2016)... STAMFORD, Conn. , May 23, 2016 /PRNewswire/ ... Company has entered into an agreement with Egalet ... various patent claims. As part of the agreement ... rights, and will enable all three companies to ... abuse-deterrent properties. "This agreement reflects the ...
Breaking Medicine Technology: