Measuring Parkinson’s Disease Progression

Overview

The Measuring Parkinson's Disease Progression study aims to use MRI scans and a controlled dose of levodopa to find a biomarker (objective measurement) of Parkinson's disease (PD). Biomarkers would help determine the effectiveness of therapies in slowing or stopping PD progression, and accelerate the pace of research.

Full Title of Study: “Dopamine Buffering Capacity Measured by phMRI as a Novel Biomarker of Disease Progression in PD”

Study Type

  • Study Type: Interventional
  • Study Design
    • Intervention Model: Single Group Assignment
    • Primary Purpose: Other
    • Masking: None (Open Label)
  • Study Primary Completion Date: October 18, 2019

Detailed Description

Early in the course of Parkinson's disease, a small dose of levodopa (L-DOPA) provides benefit for many hours. The body responds as if the levodopa in the plasma filled a reservoir and then slowly leaked out to produce benefit. With disease progression, even though the same amount of levodopa circulates in the blood, the benefit wears off much faster, as if the reservoir had become leakier. This wearing off of benefit can be characterized by a single number, the effect site rate constant Ke. On average, patients with more severe disease and longer disease duration have a larger ("leakier") Ke when the response to drug is measured using clinical features like tapping speed. Unfortunately, clinical measurements are influenced by confounding factors such as patient fatigue and comfort. A direct, objective brain measure of response to levodopa may improve the reliability of this measurement. Fortunately, we can assess the effect of levodopa on the brain directly, using an MRI machine to measure blood flow in different parts of the brain. For instance, the midbrain has a robust blood flow response to a single, clinically sensible dose of levodopa. This study's goal is to validate MRI measurement of Ke in the brain as an objective, quantitative measure of disease severity in PD. We will do this by comparing MRI-based Ke values from people with PD across a wide range of disease duration and severity. In a subgroup of participants, we will do this measurement twice, once before treatment and once after 6 weeks of treatment with carbidopa-levodopa (Sinemet® and other brand names).

Interventions

  • Drug: Levodopa
    • At least 1 hour after 200mg carbidopa p.o., each subject will receive an intravenous solution of levodopa in saline at a rate based on age and body mass according to the “final dose” described in Black et al 2003.The total dose for a 70-year-old, 70kg subject will be approximately 65mg. Subjects with untreated PD will then take 6 ┬▒ 1 weeks of clinically dosed oral carbidopa-levodopa tablets for clinical purposes and then repeat the carbidopa plus intravenous levodopa dose as above.

Arms, Groups and Cohorts

  • Experimental: PD Group
    • A broad range of Parkinson’s disease severity and disease duration. Some subjects will not be treated currently with levodopa, and thus likely will be early in the disease process.

Clinical Trial Outcome Measures

Primary Measures

  • Ke measured by phMRI
    • Time Frame: 2 hours
    • Effect site rate constant measured by serum levodopa concentrations and regional cerebral blood flow. Note, there are no outcome measures relevant to clinical care. This is not a placebo-controlled treatment study.

Secondary Measures

  • Side effect ratings
    • Time Frame: 2 hours
    • Nausea/vomiting, sleepiness, dizziness or lightheadedness, and overall feeling poorly or well, are each measured on a horizontal visual analog scale before and at the end of the i.v. levodopa infusion

Participating in This Clinical Trial

Inclusion Criteria

  • Age 40-79 at screening
  • Meet accepted diagnostic criteria for Parkinson disease

Exclusion Criteria

Key exclusion criteria:

  • Deep brain stimulator (DBS)
  • Pregnancy
  • Patients taking a dopamine antagonist (like quetiapine) or dopamine partial agonist (like aripiprazole)
  • Metal in the head or eye, or other contraindication to MRI
  • Claustrophobia
  • Serious neurologic disease other than PD
  • Head trauma with loss of consciousness for more than 5 minutes
  • Severe or unstable systemic illness
  • Certain psychiatric illnesses (dementia, psychosis, current major depression)
  • Current alcohol use disorder
  • Subjects who feel that going without nicotine for 3-4 hours would be uncomfortable
  • Currently taking an extended-release formulation of a dopamine agonist (like Mirapex ER or Requip XL)

Gender Eligibility: All

Minimum Age: 40 Years

Maximum Age: 79 Years

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • Kevin J. Black, MD
  • Collaborator
    • The Michael J. Fox Foundation for Parkinson’s Research
  • Provider of Information About this Clinical Study
    • Sponsor-Investigator: Kevin J. Black, MD, Professor – Washington University School of Medicine
  • Overall Official(s)
    • Kevin J Black, MD, Principal Investigator, Washington University School of Medicine

References

Black KJ, Carl JL, Hartlein JM, Warren SL, Hershey T, Perlmutter JS. Rapid intravenous loading of levodopa for human research: clinical results. J Neurosci Methods. 2003 Jul 15;127(1):19-29.

Siddiqi SH, Abraham NK, Geiger CL, Karimi M, Perlmutter JS, Black KJ. The Human Experience with Intravenous Levodopa. Front Pharmacol. 2016 Jan 6;6:307. doi: 10.3389/fphar.2015.00307. eCollection 2015. Review.

Koller JM, Vachon MJ, Bretthorst GL, Black KJ. Rapid Quantitative Pharmacodynamic Imaging with Bayesian Estimation. Front Neurosci. 2016 Apr 8;10:144. doi: 10.3389/fnins.2016.00144. eCollection 2016.

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