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Inosine to increase serum and cerebrospinal fluid urate in Parkinson disease: a randomized clinical trial.

ABSTRACT: Convergent biological, epidemiological, and clinical data identified urate elevation as a candidate strategy for slowing disability progression in Parkinson disease (PD).To determine the safety, tolerability, and urate-elevating capability of the urate precursor inosine in early PD and to assess its suitability and potential design features for a disease-modification trial.The Safety of Urate Elevation in PD (SURE-PD) study, a randomized, double-blind, placebo-controlled, dose-ranging trial of inosine, enrolled participants from 2009 to 2011 and followed them for up to 25 months at outpatient visits to 17 credentialed clinical study sites of the Parkinson Study Group across the United States. Seventy-five consenting adults (mean age, 62 years; 55% women) with early PD not yet requiring symptomatic treatment and a serum urate concentration less than 6 mg/dL (the approximate population median) were enrolled.Participants were randomized to 1 of 3 treatment arms: placebo or inosine titrated to produce mild (6.1-7.0 mg/dL) or moderate (7.1-8.0 mg/dL) serum urate elevation using 500-mg capsules taken orally up to 2 capsules 3 times per day. They were followed for up to 24 months (median, 18 months) while receiving the study drug plus 1 washout month.The prespecified primary outcomes were absence of unacceptable serious adverse events (safety), continued treatment without adverse event requiring dose reduction (tolerability), and elevation of urate assessed serially in serum and once (at 3 months) in cerebrospinal fluid. RESULTS Serious adverse events (17), including infrequent cardiovascular events, occurred at the same or lower rates in the inosine groups relative to placebo. No participant developed gout and 3 receiving inosine developed symptomatic urolithiasis. Treatment was tolerated by 95% of participants at 6 months, and no participant withdrew because of an adverse event. Serum urate rose by 2.3 and 3.0 mg/dL in the 2 inosine groups (P

SUBMITTER: Parkinson Study Group SURE-PD Investigators

PROVIDER: S-EPMC3940333 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature

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Inosine to increase serum and cerebrospinal fluid urate in Parkinson disease: a randomized clinical trial.

Schwarzschild Michael A MA Ascherio Alberto A Beal M Flint MF Cudkowicz Merit E ME Curhan Gary C GC Hare Joshua M JM Hooper D Craig DC Kieburtz Karl D KD Macklin Eric A EA Oakes David D Rudolph Alice A Shoulson Ira I Tennis Marsha K MK Espay Alberto J AJ Gartner Maureen M Hung Albert A Bwala Grace G Lenehan Richard R Encarnacion Elmyra E Ainslie Melissa M Castillo Richard R Togasaki Daniel D Barles Gina G Friedman Joseph H JH Niles Lisa L Carter Julie H JH Murray Megan M Goetz Christopher G CG Jaglin Jeana J Ahmed Anwar A Russell David S DS Cotto Candace C Goudreau John L JL Russell Doozie D Parashos Sotirios Andreas SA Ede Patricia P Saint-Hilaire Marie H MH Thomas Cathi-Ann CA James Raymond R Stacy Mark A MA Johnson Julia J Gauger Lisa L Antonelle de Marcaida J J Thurlow Sheila S Isaacson Stuart H SH Carvajal Lisbeth L Rao Jayaraman J Cook Maureen M Hope-Porche Charlise C McClurg Lauren L Grasso Daniela L DL Logan Robert R Orme Constance C Ross Tori T Brocht Alicia F D AF Constantinescu Radu R Sharma Saloni S Venuto Charles C Weber Joseph J Eaton Ken K

JAMA neurology 20140201 2

<h4>Importance</h4>Convergent biological, epidemiological, and clinical data identified urate elevation as a candidate strategy for slowing disability progression in Parkinson disease (PD).<h4>Objective</h4>To determine the safety, tolerability, and urate-elevating capability of the urate precursor inosine in early PD and to assess its suitability and potential design features for a disease-modification trial.<h4>Design, setting, and participants</h4>The Safety of Urate Elevation in PD (SURE-PD) ...[more]

PMID: 24366103

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Project description:Tau gene has been consistently associated with the risk of Parkinson disease in recent genome wide association studies. In addition, alterations of the levels of total tau, phosphorylated tau [181P], and amyloid beta 1-42 in cerebrospinal fluid have been reported in patients with sporadic Parkinson disease and asymptomatic carriers of leucine-rich repeat kinase 2 mutations, in patterns that clearly differ from those typically described for patients with Alzheimer disease. To further determine the potential roles of these molecules in Parkinson disease pathogenesis and/or in tracking the disease progression, especially at early stages, the current study assessed all three proteins in 403 Parkinson disease patients enrolled in the DATATOP (Deprenyl and tocopherol antioxidative therapy of parkinsonism) placebo-controlled clinical trial, the largest cohort to date with cerebrospinal fluid samples collected longitudinally. These initially drug-naive patients at early disease stages were clinically evaluated, and cerebrospinal fluid was collected at baseline and then at endpoint, defined as the time at which symptomatic anti-Parkinson disease medications were determined to be required. General linear models were used to test for associations between baseline cerebrospinal fluid biomarker levels or their rates of change and changes in the Unified Parkinson Disease Rating Scale (total or part III motor score) over time. Robust associations among candidate markers are readily noted. Baseline levels of amyloid beta were weakly but negatively correlated with baseline Unified Parkinson Disease Rating Scale total scores. Baseline phosphorylated tau/total tau and phosphorylated tau/amyloid beta were significantly and negatively correlated with the rates of the Unified Parkinson Disease Rating Scale change. While medications (deprenyl and/or tocopherol) did not appear to alter biomarkers appreciably, a weak but significant positive correlation between the rate of change in total tau or total tau/amyloid beta levels and the change of the Unified Parkinson Disease Rating Scale was observed. Notably, these correlations did not appear to be influenced by APOE genotype. These results are one of the very first pieces of evidence suggesting that tau and amyloid beta are critically involved in early Parkinson disease progression, potentially by a different mechanism than that in Alzheimer disease, although their applications as Parkinson disease progression markers will likely require the addition of other proteins.

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Inosine to increase serum and cerebrospinal fluid urate in Parkinson disease: a randomized clinical trial.

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Inosine to increase serum and cerebrospinal fluid urate in Parkinson disease: a randomized clinical trial.

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