Intravenous N-acetylcysteine for the Treatment of Gaucher's Disease and Parkinson's Disease

Study Description

Go to 

Top of Page Study Description Study Design Arms and Interventions Outcome Measures Eligibility Criteria Contacts and Locations More Information

Brief Summary:

The investigators are interested in determining if the investigators are able to detect changes in brain chemistry using Magnetic Resonance Spectroscopy (MRS) in individuals with Parkinson's disease (PD), those with Gaucher's disease (GD), and those without neurological disorders (healthy controls) when they are given the antioxidant N-acetylcysteine (NAC). This study will combine information from a medical history, a physical examination and disease rating scales with results obtained using MRS brain scans and pharmacokinetic studies from blood samples. This research will require 1 visit that will require about 4 to 5 hours of time. During this study, participants will provide their medical history, be examined and undergo a rating scale for about one hour; the brain scan and pharmacokinetic studies will require 1.5-2 hours of time; in total the study will take about 4-5 hours.

Condition or disease	Intervention/treatment	Phase
Parkinson's Disease; Gaucher's Disease	Drug: N-acetylcysteine	Phase 1

Detailed Description:

Oxidative stress is implicated in the pathogenesis of a number of neurodegenerative diseases such as Parkinson's disease (PD). Further, levels of glutathione (GSH), a prevalent endogenous antioxidant, are decreased in the postmortem substantia nigra (SN) of individuals with PD, indicating increased oxidative stress, although this has yet not been confirmed in vivo. Increases in intracellular oxidative stress have also been observed in primary fibroblast cultures obtained from patients with GD, where enzyme replacement therapy resulted in increases in total GSH. The hypothesis that oxidative stress plays a key role in the neurodegeneration associated with PD suggests that antioxidants may be useful in altering disease progression.

N-acetylcysteine (NAC) is a well-known antioxidant that is thought to act both as a free radical scavenger and as a cysteine donor for the synthesis of GSH. NAC may be beneficial in the treatment of PD and GD. Magnetic resonance spectroscopy (MRS) methods may be able to determine if there are effects from NAC on central nervous system GSH levels. In addition, use of red blood cell (RBC) measurements of GSH, if correlated with brain concentrations, could serve as an easily measured biomarker to help characterize and monitor response to therapy. The investigators therefore propose to conduct a study of the effect of a single, intravenous dose of NAC on central (brain) measures of GSH and peripheral (RBC) measures of GSH in people with PD and healthy controls, through the use of simultaneous MRS techniques and pharmacokinetic studies. The investigators hypothesis and specific aims are as follows:

Hypothesis: RBC and brain GSH concentrations will increase following oral NAC administration in individuals with Parkinson's disease (PD), Gaucher's disease (GD), and control participants.

Specific Aims:

1. Quantitate baseline plasma and red blood cell GSH concentrations in those with PD and GD and controls; and characterize NAC and GSH pharmacokinetics after a single intravenous NAC administration.
2. Quantitate brain GSH levels (as ascertained through MRS) in those with PD and GD and controls at baseline and after a single intravenous NAC administration simultaneously with Aim 1.
3. Construct a pharmacokinetic model to evaluate the relationship between peripheral (plasma and RBC) and central (brain) GSH measurements.

Study Design

Go to 

Top of Page Study Description Study Design Arms and Interventions Outcome Measures Eligibility Criteria Contacts and Locations More Information

Study Type :	Interventional (Clinical Trial)
Actual Enrollment :	9 participants
Allocation:	Non-Randomized
Intervention Model:	Single Group Assignment
Masking:	None (Open Label)
Primary Purpose:	Treatment
Official Title:	Intravenous N-acetylcysteine for the Treatment of Gaucher's Disease and Parkinson's Disease
Study Start Date :	July 2011
Actual Primary Completion Date :	December 2012
Actual Study Completion Date :	December 2012

Arms and Interventions

Go to 

Top of Page Study Description Study Design Arms and Interventions Outcome Measures Eligibility Criteria Contacts and Locations More Information

Arm	Intervention/treatment
Experimental: NAC in PD; single intravenous administration of N-acetylcysteine in PD patients	Drug: N-acetylcysteine; Single, intravenous administration of N-acetylcysteine; Other Name: NAC
Experimental: NAC in GD; single intravenous administration of N-acetylcysteine in GD patients	Drug: N-acetylcysteine; Single, intravenous administration of N-acetylcysteine; Other Name: NAC
Experimental: NAC in controls; single intravenous administration of N-acetylcysteine in control subjects	Drug: N-acetylcysteine; Single, intravenous administration of N-acetylcysteine; Other Name: NAC

Outcome Measures

Go to 

Top of Page Study Description Study Design Arms and Interventions Outcome Measures Eligibility Criteria Contacts and Locations More Information

Primary Outcome Measures :

1. Brain GSH [ Time Frame: Baseline and up to 110 minutes post-NAC administration ]
   change in brain GSH levels from baseline to post-NAC administration (90 - 110 minutes) in all subjects

Eligibility Criteria

Go to 

Top of Page Study Description Study Design Arms and Interventions Outcome Measures Eligibility Criteria Contacts and Locations More Information

Ages Eligible for Study:	18 Years and older (Adult, Older Adult)
Sexes Eligible for Study:	All
Accepts Healthy Volunteers:	Yes

Criteria

Inclusion Criteria:

1. All participants must be 18 years or older.
2. All enrollees must understand and cooperate with requirements of the study in the opinion of the investigators and must be able to provide written informed consent.
3. Individuals with medically stable Parkinson's disease (in the opinion of the investigator).
4. All participants must not have taken antioxidants coenzyme Q-10, vitamin C, or vitamin E for 3 weeks prior to the study.
5. Absence of dementia in all subjects, as determined by pre-scanning cognitive assessment.
6. Control subjects who are able to undergo MRS

Exclusion Criteria:

1. Inability to undergo MRI scanning without sedation
2. Medically unstable conditions in any group as determined by the investigators
3. Pregnant or lactating or those women of child-bearing age that are not using acceptable forms of contraception
4. Diagnosis of asthma that is presently being treated with ANY medication, or past history of asthma/bronchospasm resulting in an emergency room visit, hospitalization or treatment
5. Unable to adhere to study protocol for whatever reason

Contacts and Locations

Go to 

Top of Page Study Description Study Design Arms and Interventions Outcome Measures Eligibility Criteria Contacts and Locations More Information

Locations

United States, Minnesota
University of Minnesota
Minneapolis, Minnesota, United States, 55455

Sponsors and Collaborators

University of Minnesota - Clinical and Translational Science Institute

Rare Diseases Clinical Research Network

National Center for Advancing Translational Science (NCATS)

National Institute of Neurological Disorders and Stroke (NINDS)

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

Investigators

Principal Investigator:	Paul Tuite, MD	University of Minnesota - Clinical and Translational Science Institute

More Information

Go to 

Top of Page Study Description Study Design Arms and Interventions Outcome Measures Eligibility Criteria Contacts and Locations More Information

Additional Information:

Rare Disease Clinical Research Network 

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

Holmay MJ, Terpstra M, Coles LD, Mishra U, Ahlskog M, Öz G, Cloyd JC, Tuite PJ. N-Acetylcysteine boosts brain and blood glutathione in Gaucher and Parkinson diseases. Clin Neuropharmacol. 2013 Jul-Aug;36(4):103-6. doi: 10.1097/WNF.0b013e31829ae713.

Responsible Party:	University of Minnesota - Clinical and Translational Science Institute
ClinicalTrials.gov Identifier:	NCT01427517 History of Changes
Other Study ID Numbers:	6721; U54NS065768 ( U.S. NIH Grant/Contract )
First Posted:	September 1, 2011
Results First Posted:	August 2, 2013
Last Update Posted:	August 14, 2013
Last Verified:	August 2013

Keywords provided by University of Minnesota - Clinical and Translational Science Institute:

Parkinson's disease; Gaucher's disease; Control

Additional relevant MeSH terms:

Parkinson Disease; Gaucher Disease; Parkinsonian Disorders; Basal Ganglia Diseases; Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Movement Disorders; Neurodegenerative Diseases; Sphingolipidoses; Lysosomal Storage Diseases, Nervous System; Brain Diseases, Metabolic, Inborn; Brain Diseases, Metabolic; Metabolism, Inborn Errors; Genetic Diseases, Inborn	Lipidoses; Lipid Metabolism, Inborn Errors; Lysosomal Storage Diseases; Metabolic Diseases; Lipid Metabolism Disorders; Acetylcysteine; N-monoacetylcystine; Antiviral Agents; Anti-Infective Agents; Expectorants; Respiratory System Agents; Free Radical Scavengers; Antioxidants; Molecular Mechanisms of Pharmacological Action; Protective Agents