Clinical trial test new treatment for Parkinson's disease dementia

Parkinson's disease
Immunohistochemistry for alpha-synuclein showing positive staining (brown) of an intraneural Lewy-body in the Substantia nigra in Parkinson's disease. Credit: Wikipedia

After Alzheimer's disease, Lewy body dementia and related Parkinson's disease dementia (PDD) are some of the most common types of dementia affecting older adults, but they are severely understudied. While PDD patients are often prescribed medications that treat psychosis and Alzheimer's disease, there are no medications designed specifically to treat these illnesses.

Fortunately, that's changing. This year, Eli Lilly and Company has launched a clinical trial for the first treatment designed to benefit patients with mild-to-moderate PDD.

The University at Buffalo is among 72 sites nationwide that are recruiting patients for this 12-week, randomized, placebo-controlled drug trial.

"Participating in this trial could help push this drug more quickly through the pipeline," said Kinga Szigeti, MD, Ph.D., associate professor of neurology in the Jacobs School of Medicine and Biomedical Sciences at UB, who is principal investigator at UB. Interested patients will be seen at UBMD Neurology, where Szigeti is director of its Alzheimer's Disease and Memory Disorders Center.

For more information on getting screened for the UB trial, contact Connie Brand, clinical research coordinator at UBMD Neurology, at 716-323-0549.

PDD and Lewy body affect an estimated 1.4 million Americans. The condition often occurs after a patient has been diagnosed with Parkinson's , the symptoms of which often begin with the inability to control movements but then progress to affect cognition. In Lewy body dementia, cognitive decline is the first symptom, frequently followed by Parkinsonian features. Both diseases are characterized by abnormal protein deposits called synuclein, which form Lewy bodies in the neurons.

Neuropsychiatric symptoms

A key distinction between PDD and most other kinds of dementia are the that can occur, such as hallucinations and Capgras or "imposter syndrome," where patients believe that a loved one has been replaced by an identical imposter.

"The neuropsychiatric symptoms can make this kind of dementia much more challenging for families to deal with than Alzheimer's disease," Szigeti said.

PDD symptoms also include a tendency to sleep for long periods at a time, sometimes 14-16 hours per day. "Sleeping so much can cause patients to lose muscle mass, becoming more frail and more prone to infection," Szigeti explained. "Changes in the can lead to an unhealthy drop in blood pressure, and patients become more prone to falls."

For these reasons, she noted, patients with this kind of dementia have a lifespan that is much shorter than for Alzheimer's patients.

"Lewy body dementia has been very understudied in ," said Szigeti.

While some medications used to treat psychosis can mitigate certain aspects of Lewy body dementia, many of them also increase the risk of stroke or even death.

Between a rock and a hard place

"For that reason, many patients and their families feel they have no options," said Szigeti. "They find themselves between a rock and a hard place."

But now, Western New York patients have an opportunity to participate in the first clinical trial to test a medication for Lewy body dementia at the Jacobs School.

The advantage of the new drug, known as LY3154207, is that it has a novel mechanism of action on dopamine, the brain chemical that Parkinson's disease rapidly depletes. The drug was designed to maximize the brain's response to the remaining dopamine, therefore improving cognition, motor function and boosting wakefulness. It is taken in pill form.

"We are for the first time offering hope to these patients and their families, and an opportunity to participate in this trial," Szigeti said.


Explore further

What is Lewy body dementia, which robbed robin williams of his sanity?

Citation: Clinical trial test new treatment for Parkinson's disease dementia (2019, March 4) retrieved 17 June 2019 from https://medicalxpress.com/news/2019-03-clinical-trial-treatment-parkinson-disease.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
16 shares

Feedback to editors

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more