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Single and Multiple Doses of an Oral Formulation of L-Homoarginine in Healthy Human Subjects

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ClinicalTrials.gov Identifier: NCT02675660
Recruitment Status : Completed
First Posted : February 5, 2016
Last Update Posted : September 8, 2016
Information provided by (Responsible Party):
Universitätsklinikum Hamburg-Eppendorf

Brief Summary:
This study represents an initial clinical evaluation of an oral formulation of L-homoarginine. L-homoarginine and L-arginine are amino acids found in food proteins and are both substrates for nitric oxide synthase (NOS). L-arginine is available as over the counter nutraceutical. This study will provide information on the dosing of L-homoarginine in order to reach high physiological plasma concentrations in humans.

Condition or disease Intervention/treatment Phase
Healthy Dietary Supplement: L-Homoarginine Drug: Placebo Phase 1

Detailed Description:
  1. Study Design In a randomized, double-blind, placebo-controlled cross-over design participants receive either L-homoarginine 125 mg or placebo once daily in the morning for four weeks each. The study periods are separated by a washout phase of four weeks, and the sequence of the medications is randomly chosen in each participant. The study is preceded by a run-in phase, where all participant receive a single dose of 125 mg L-homoarginine. Blood samples (2.7 ml ethylenediaminetetraacetic acid vacutainer) for plasma L-homoarginine determinations are drawn at time points 0, 15 min, 30 min, 1, 2, 4, 8, 24, 48, 72, and 120 hours after single and multiple doses of L-homoarginine and placebo, respectively. At baseline and four weeks after each supplementation period (hArg and placebo), routine laboratory, arginine, asymmetric dimethylarginine, pulse wave velocity, augmentation index, flow-mediated vasodilatation, transcranial magnetic stimulation, and test battery of attentional performance are evaluated as secondary endpoints.
  2. Study Duration One year
  3. Sample Size Calculation and Statistical Evaluation Due to the exploratory nature of this pilot study, exploratory statistical methods will be used for statistical evaluation of the study results, and no formal sample size calculation was performed. In a previous study 20 participants were included to assess the kinetic, dynamic, and safety profile of L-citrulline and L-arginine [Schwedhelm et al. 2007]. Statistical comparisons will be performed using two-sided tests, i.e. Student's t-test and ANOVA. A p < 0.05 will be considered significant.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 20 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Basic Science
Official Title: Study to Evaluate the Safety, Tolerability, Kinetics, and Dynamics of Single and Multiple Doses of an Oral Formulation of L-Homoarginine
Study Start Date : April 2014
Actual Primary Completion Date : April 2015
Actual Study Completion Date : January 2016

Arm Intervention/treatment
Experimental: L-Homoarginine
125 mg of L-homoarginine
Dietary Supplement: L-Homoarginine
125 mg L-homoarginine once daily

Placebo Comparator: Placebo
placebo capsules
Drug: Placebo
placebo capsules once daily

Primary Outcome Measures :
  1. Area under the plasma concentration versus time curve (AUC) [ Time Frame: 1 Month ]
    To determine the AUC of L-homoarginine (a) following a single oral dose and (b) following administration of multiple oral doses of L-homoarginine.

Secondary Outcome Measures :
  1. Peak plasma concentration (Cmax) [ Time Frame: 1 Month ]
    To determine the Cmax of L-homoarginine (a) following a single oral dose and (b) following administration of multiple oral doses of L-homoarginine.

  2. Half life of plasma concentration (t1/2) [ Time Frame: 1 Month ]
    To determine the t1/2 of L-homoarginine (a) following a single oral dose and (b) following administration of multiple oral doses of L-homoarginine.

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Ages Eligible for Study:   20 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  1. Male or female, 20-75 years of age on the day of dosing and is generally healthy as determined by medical history, physical examination, and laboratory test values
  2. For females, postmenopausal for at least 2 years prior to screening (confirmed by a negative hormone panel, i.e., plasma 17β-estradiol concentration of <20 pg/mL and follicle-stimulating hormone level of >40 IU/mL) or contraception
  3. Has signed and received a copy of the written informed consent form approved by the investigator's Independent Ethics Committee (IEC), understands the purposes and risks of the study and agrees to follow the restrictions and schedule of procedures as defined by the study protocol

Exclusion Criteria:

  1. Sitting blood pressure greater than 160/100 or less than 90/60 mm Hg
  2. Sitting heart rate greater than 99 bpm or less than 50 beats per minute (bpm)
  3. History of clinically significant hypotensive episodes or symptoms of fainting, dizziness, or light-headedness
  4. Body Mass Index (BMI) greater than 32 or less than 16 at screening [BMI = Weight (kg) ÷ Height2 (m2)]
  5. History or symptoms of cardiovascular disease, particularly coronary artery disease, arrhythmias,or congestive heart failure
  6. History of significant central nervous system disease, including transient ischemic attack, stroke, seizure disorder, or behavioral disturbances

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02675660

Sponsors and Collaborators
Universitätsklinikum Hamburg-Eppendorf
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Principal Investigator: Rainer H Böger, Prof. Dr. UHHamburg Eppendorf
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Responsible Party: Universitätsklinikum Hamburg-Eppendorf
ClinicalTrials.gov Identifier: NCT02675660    
Other Study ID Numbers: Homoarginine-UKE-KP2012-01
First Posted: February 5, 2016    Key Record Dates
Last Update Posted: September 8, 2016
Last Verified: September 2016
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Keywords provided by Universitätsklinikum Hamburg-Eppendorf:
kinetic data