Navigation Links
Parkinsons Disease Mechanism Identified

Researchers have reported progress in understanding the mechanism underlying that death, which they say suggests a new treatment pathway .

In the vast majority of Parkinsons disease (PD) patients, the disorder arises not because of a genetic defect, but because some external insult triggers the death of dopamine-producing neurons.

In both mice and human patients, the researchers have found evidence that neurons die because of a crippling of a particular protective enzyme that eliminates potentially damaging reactive oxygen species normally generated in the cells power plants, called mitochondria.

David Park, of the Ottawa Health Research Institute, and colleagues published their findings in the July 5, 2007 issue of the journal Neuron, published by Cell Press.

The researchers studied the mechanism of PD using a mouse model of the disease, in which a mitochondria-affecting toxin called MPTP is used to produce Parkinsons-like brain pathology.

In earlier studies, they had found that MPTP activates protein-snipping enzymes called calpains in mitochondria. They also found evidence that calpains, in turn, activate a cellular switch called Cdk5. The question, however, was how this abnormal activation ultimately kills neurons.

In their new studies, the researchers analyzed neurons to determine that Cdk5 regulates yet another enzyme called Prx2. This enzyme is known as a peroxidase and acts to render harmless the chemically active reactive oxygen species that are produced inside mitochondria in the process of generating energy for the cell.

Specifically, the researchers found that treating neurons with MPTP activates Cdk5 to switch off Prx2. Whats more, they found that activating Prx2 in MPTP-treated mice prevented the loss of dopamine-producing neurons. And they experimentally demonstrated that the action of Cdk5 on Prx2 plays a pivotal role in the neuronal damage from MPTP.

Importa ntly, the researchers discovered evidence that the loss of Prx2 activity also plays a role in human PD. They found reduced Prx2 activity in brain tissue from PD patients.

These findings provide a mechanistic link of how a mitochondrial damaging agent, through calpain-mediated Cdk5 activation and downregulation of an important antioxidant enzyme, can increase oxidative load, leading ultimately to death, concluded the scientists.

Taken together, our findings suggest that strategies to modulate Prx2 activity serve as beneficial targets for treatment of PD, they concluded.

This is of particular importance since Cdk5 is thought to have normal beneficial roles in neurons and modulating a relevant downstream target rather than Cdk5 directly may be a better therapeutic strategy with regard to this pathway.


'"/>




Related medicine news :

1. Gambling related to Parkinsons medication
2. Drug Pramipexole Usage Linked To Gambling Addiction In Parkinsons Patients
3. Highly Educated More Prone To Parkinsons Disease
4. Make Treatment of Parkinsons More Affordable, Doctors Plead
5. Parkinsons Disease can Be Predicted by Metabolic Pathway
6. Neural Stem Cells Reduce Parkinsons Symptoms in Monkeys
7. Risk of Parkinsons Increased by Exposure to Pesticide and Head Trauma
8. Coenzyme Q10 Does Not Improve Parkinsons Disease Symptoms
9. Patients Affected by Parkinsons may Be Benefited from Treadmill Exercise
10. UCLA Researchers Discover Link Between Parkinsons and Narcolepsy
11. First Ever Patch Drug To Treat Parkinsons Symptoms Approved
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/5/2016)... ... February 05, 2016 , ... Looking for a last-minute Valentine’s ... the tips of your toes. Foot massage, whether administered by a professional masseuse or ... relaxation. The American Board of Multiple Specialties in Podiatry (ABMSP) has taken ...
(Date:2/5/2016)... Rafael, CA (PRWEB) , ... February 05, 2016 , ... ... with ChildLight Yoga Studio in Dover, NH to direct high-performance kids yoga training. ChildLight ... New Hampshire’s seacoast, just one hour from Boston. , ChildLight Yoga Studio founder Lisa ...
(Date:2/5/2016)... ... 05, 2016 , ... Give To Cure today announced that it ... to Give To Cure’s campaign that is crowdfunding clinical trials to help find cures ... payments through a smart device. In 2015 alone, Venmo processed $7.5 billion in transactions ...
(Date:2/5/2016)... (PRWEB) , ... February 05, 2016 , ... Dr. Justin ... announce their 2nd Annual No Cost Dental Day to individuals in need. The event ... purpose of this No Cost Dental Day is to provide dental care to community ...
(Date:2/5/2016)... (PRWEB) , ... February 05, 2016 , ... In sleep, ... form as a dream. A hallmark feature of patients with eating disorders is significant ... The eating disorder behaviors and obsessions are regarded as maladaptive means for coping with ...
Breaking Medicine News(10 mins):
(Date:2/4/2016)... , Feb. 4, 2016   Bernstein Liebhard LLP ... filed in the United States District Court for the District ... class (the "Class") consisting of all persons or entities who ... "Company") (NASDAQ: INSY ) from March 3, 2015 through ... and certain of its officers with violations of the Securities ...
(Date:2/4/2016)... 4, 2016  Montoya Love is recognized by Continental ... of Pharmaceuticals. Montoya is the Regulatory Systems Operations Manager ... Manufacturing and selling a broad ... provides healthcare institutions, clinical laboratories and life science ... across the globe. ...
(Date:2/4/2016)... 2016 Frontier Pharma: Chronic Obstructive Pulmonary ... Chronic Obstructive Pulmonary Disease (COPD) ... of the airways and lungs. Persistent breathing difficulties ... disease one of the leading causes of morbidity ... world. COPD is linked to cumulative exposure to ...
Breaking Medicine Technology: