Mitochondria and Chronic Kidney Disease

Overview

The overarching goal of this study is to determine the role of chronic kidney disease and the activation of the kallikrein-kinin system during hemodialysis on the development of mitochondrial dysfunction; the investigators will measure mitochondrial function using the gold standard method, 31-phosphorus magnetic resonance spectroscopy.

The investigators will test the hypothesis that endogenous bradykinin promotes mitochondrial dysfunction in patients undergoing hemodialysis. The investigators will first perform a randomized, placebo-controlled, double-blind, cross-over study measuring the effect of Icatibant (HOE-140), a bradykinin B2 receptor blocker, on mitochondrial function.

Full Title of Study: “Mitochondrial Dysfunction in Chronic Kidney Disease”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Randomized
    • Intervention Model: Crossover Assignment
    • Primary Purpose: Prevention
    • Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
  • Study Primary Completion Date: June 30, 2018

Interventions

  • Drug: Icatibant
    • Subjects will receive either Icatibant or placebo in the first study day. After a washout period of 3 weeks, participant will receive the other treatment. Icatibant (50µg/kg/h) or placebo will be infused for 1 hour prior to the initiation of dialysis and continue through hemodialysis. Hemodialysis session will last approximately 4 hours. Two hours after the end of hemodialysis, The investigators will evaluate mitochondrial function by 31 phosphorus magnetic resonance spectroscopy.
  • Drug: Placebo
    • Subjects will receive either Icatibant or placebo in the first study day. After a washout period of 3 weeks, participant will receive the other treatment. Icatibant (50µg/kg/h) or placebo will be infused for 1 hour prior to the initiation of dialysis and continue through hemodialysis. Hemodialysis session will last approximately 4 hours. Two hours after the end of hemodialysis, the investigators will evaluate mitochondrial function by 31 phosphorus magnetic resonance spectroscopy.

Arms, Groups and Cohorts

  • Experimental: Icatibant then Placebo
    • Icatibant will be intravenously infused at a rate of 50 ug/kg/h for 1 hour prior to the initiation of dialysis and continue through hemodialysis (4 hours) 1 week washout Placebo will be intravenously infused at the same rate of Icatibant (50 ug/kg/h) for 1 hour prior to the initiation of dialysis and continue through hemodialysis (4 hours)
  • Experimental: Placebo then Icatibant
    • Placebo will be intravenously infused at the same rate of Icatibant (50 ug/kg/h) for 1 hour prior to the initiation of dialysis and continue through hemodialysis (4 hours) 1 week washout Icatibant will be intravenously infused at a rate of 50 ug/kg/h for 1 hour prior to the initiation of dialysis and continue through hemodialysis (4 hours)

Clinical Trial Outcome Measures

Primary Measures

  • Phosphocreatine (PCR) Recovery Time After Knee Extension Assessed by 31 Phosphorus Magnetic Resonance Spectroscopy (31P-MRS)
    • Time Frame: Up to 2 hours after completion of drug infusion
    • Mitochondria function will be evaluated using 31P-MRS, which evaluates the concentration of phospho-creatine (PCr) and other phosphate-energy carrier molecules. After basal measurements, subjects will be asked to perform 90 seconds of knee extension followed by 4 minutes of rest. The exercise/rest cycle will be repeated 3 times. Magnetic resonance spectra will be used to calculate concentrations of inorganic phosphate (Pi), PCr, and adenosine triphosphate (ATP). The time constant tau of PCr recovery (time to achieve 66.3% maximal concentration during recovery) will be used to determine mitochondrial function.

Secondary Measures

  • Systolic Blood Pressure
    • Time Frame: 30 minutes before hemodialysis, during dialysis, and up to 1 hour after hemodialysis
    • Blood pressure will be monitored every 15 minutes, before, during, and after hemodialysis.

Participating in This Clinical Trial

Inclusion Criteria

  • Adult patients who have been on maintenance hemodialysis for at least 6 months

Exclusion Criteria

  • History of functional transplant less than 6 months prior to study
  • Use of immunosuppressive drugs within 1 month prior to study
  • History of active connective tissue disease
  • History of acute infectious disease within one month prior to study
  • AIDS (HIV seropositivity is not an exclusion criteria)
  • History of myocardial infarction or cerebrovascular event within 3 months
  • Advanced liver disease
  • Gastrointestinal dysfunction requiring parental nutrition
  • Active malignancy excluding basal cell carcinoma of the skin
  • Ejection fraction less than 30%
  • Anticipated live donor kidney transplant
  • Pregnancy, breast-feeding or child-bearing potential
  • History of poor adherence to hemodialysis or medical regimen
  • Subjects with cardiac pacemaker, artificial heart valve, any metallic implant, permanent tattoo, or any retained foreign metallic bodies that are contraindicated in magnetic resonance imaging.
  • Inability to provide consent

Gender Eligibility: All

Minimum Age: 18 Years

Maximum Age: 78 Years

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • Vanderbilt University Medical Center
  • Provider of Information About this Clinical Study
    • Principal Investigator: Jorge Gamboa, Research Associate Professor – Vanderbilt University Medical Center

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