The Effect of L-lysine on Human Gastrointestinal Secretion: A Dose-finding Study Applying Magnetic Resonance Imaging (MRI)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01579799
Recruitment Status : Completed
First Posted : April 18, 2012
Last Update Posted : May 28, 2015
Information provided by (Responsible Party):
University of Zurich

Brief Summary:
This is a pilot dose-finding study, which is performed with a randomized, double-blind, 3-armed, unbalanced, cross-over study design. Three of four different doses of L-lysine Monohydrate (A = 0.5 g, B = 1.2 g, C = 3.0 g and D = 7.5 g) will be applied in a randomized sequence on three different study days in six healthy volunteers. Each study day involves the repeated measurement of gastric content volume, gastric secretion volume and intestinal fluid volume using MRI before and after intragastric infusion of L-lysine Monohydrate test meals. Additionally, symptoms for hunger, fullness, nausea, bloating, abdominal cramps and urge to defecate will be recorded using a scale from 0-10. In parallel, samples of gastric juice to measure intragastric pH and pepsin concentration, samples of venous blood to assess blood pH and haematocrit as well as L-lysine, Serotonin, chloride bicarbonate and albumin plasma concentration and samples of arterialized blood from ear lobe to measure glucose blood concentration will be collected

Condition or disease Intervention/treatment Phase
Healthy Drug: L-lysine Not Applicable

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 6 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Basic Science
Study Start Date : April 2012
Actual Primary Completion Date : August 2012
Actual Study Completion Date : September 2012

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: Dose 0.5 Drug: L-lysine
Dose finding study for L-lysine

Active Comparator: Dose 7.5 Drug: L-lysine
Dose finding study for L-lysine

Active Comparator: Dose 3 Drug: L-lysine
Dose finding study for L-lysine

Active Comparator: Dose 1.2 Drug: L-lysine
Dose finding study for L-lysine

Primary Outcome Measures :
  1. Gastric half-emptying time [ Time Frame: 120 minutes ]

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Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion criteria: > 18, < 50 years Healthy BMI > 19, <24

Exclusion criteria: Age under 18 or above 50

  • Pathologic underweight or overweight (BMI <19 or >24 (kg/m2))
  • Previous gastrointestinal, cardio-respiratory (incl. arterial hypertension), hematologic (anaemia), renal, hepatic, atopic, alimentary disease, psychiatric disease, epilepsy, panic attacks, diabetes drug or alcohol abuse, lysinuria, galactosaemia
  • Subjects unable to stop medication that alters gut function for 1 week prior to the study, including anticholinergics, calcium canal inhibitors, beta blocker, prokinetics, proton-pump inhibitors, DDV-IV-Inhibitors, Incretin-mimetics, non-steroidal anti-inflammatory drugs, Macrolidantibiotica
  • Subjects unable to stop medication within 48 prior the study begins that alters serotonin blood profiles , including paracetamol, cumarine, mephenesin, phenobarbital, acetanilide, ephedrine, amphetamine, phentolamin, phenacetin, methocarbamol, acetylsalicylic acid, levodopa, promethazine, isoniazid, methenamine, streptozocin, chlorpromazine
  • Positive helicobacter pylori test
  • Previous history of gastrointestinal disease or surgery (excludes appendectomy, hernia repair and anorectal disorders)
  • Presence of metallic implants, devices or metallic foreign bodies
  • Pregnancy and lactation (female patients of child bearing age will receive a pregnancy test prior to study)
  • Involvement in any other clinical trial during the course of this trial, nor within a period of 14 days prior to its beginning or 14 days after its completion
  • Mental capacity (DSM IV, inter alia Claustrophobia), which limits the capability to fulfill the demands of the study
  • Known allergy or intolerance against capsaicin, locus bean gum, L-lysine, DOTAREM®, Fructose, Gluten, Galactose Known allergic reaction after prior injection of lidocaine (e.g. at the dentist )
  • Known allergic reaction toward methylparaben (E218)

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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 identifier (NCT number): NCT01579799

University Hospital Zurich, Gastroenterology
Zurich, ZH, Switzerland, 8091
Sponsors and Collaborators
University of Zurich
Principal Investigator: Werner Schwizer, Prof. MD University Hospital Zurich, Gastroenterology & Hepatology

Responsible Party: University of Zurich Identifier: NCT01579799     History of Changes
Other Study ID Numbers: KEK-ZH-NR. 2012-0005
First Posted: April 18, 2012    Key Record Dates
Last Update Posted: May 28, 2015
Last Verified: May 2015