Clinical trials: Amino Acid Metabolism
Endothelial Dysfunction, Hyperhomocysteinemia
Effect of L-Arginine and Pycnogenol on Light to Moderate Hypertension and Endothelial Function
The effect of a combination product (Verum ) with L-arginine, Pycnogenol, vitamin K2, R-(+)-alpha-lipoic acid and vitamins B6, B12 and folic acid is investigated in a double blind placebo-controlled cross-over study.
- Conditions
- Endothelial Dysfunction, Hyperhomocysteinemia, Hypertension Grade I, Subgroup "Borderline" (WHO)
- Trial name
- NCT02392767
- Testing
- Verum
- Where
- Germany
- Volunteers
- 25 people, healthy volunteers welcome
- Sponsor
- Dr. Loges & Co. GmbH
Phenylketonuria (PKU)
A Pilot Study on Diurnal Variation
This self-controlled, prospective, pilot study is designed to gather information regarding the diurnal variation (changes that occur each day) in the levels of plasma phenylalanine (Phe) and tyrosine in patients with…
- Trial name
- NCT01806051
- Testing
- Kuvan
- Where
- United States
- Volunteers
- 6 people, healthy volunteers welcome
- Sponsor
- Dr. Linda Randolph
Urea Cycle Disorders, Inborn
Comparative Efficacy of Phenylbutyrate (PBA) vs. Benzoate in Urea Cycle Disorders
The investigators will study and compare how effectively sodium phenylbutyrate, sodium benzoate, and a combination of the two, help excrete nitrogen in healthy volunteers.
- Trial name
- BPA/Benzoate (NCT02111200)
- Testing
- Sodium Benzoate, Sodium Phenylbutyrate
- Where
- United States
- Volunteers
- 7 people, healthy volunteers welcome
- Sponsor
- Baylor College of Medicine
Phenylketonuria
A Study of PTC923 in Participants With Phenylketonuria
The main purpose of this trial is to evaluate the efficacy of PTC923 in reducing blood phenylalanine (Phe) levels in participants with phenylketonuria as measured by mean change in blood Phe levels from baseline to Weeks 5 and 6…
- Trial name
- NCT05099640
- Testing
- PTC923
- Where
- 43 sites in United States, Australia and 13 more
- Volunteers
- 157 people
- Sponsor
- PTC Therapeutics
Phenylketonuria
A Phase 3 Substudy to Evaluate Executive Function in Adults With PKU Who Are Participating in the Phase 3 Study, 165-302
A Phase 3 substudy to evaluate executive function in adults with phenylketonuria who are participating in the phase 3 Study, 165-302. Approximately 100 subjects, aged ≥ 18 to ≤ 70 years old, with PKU will be enrolled.
- Trial name
- PRISM303 (NCT02468570)
- Testing
- Administration of CANTAB and Subject Global Assessment
- Where
- 4 sites in United States
- Volunteers
- 9 people
- Sponsor
- BioMarin Pharmaceutical
Phenylketonurias
Study to Evaluate the Safety and Efficacy of Phenoptin™ in Subjects With Phenylketonuria Who Have Elevated Phenylalanine Levels
The primary objective of this study is to evaluate the efficacy of Phenoptin™ (sapropterin dihydrochloride) in reducing blood phenylalanine (Phe) levels in subjects with phenylketonuria.
- Trial name
- NCT00104247
- Testing
- sapropterin dihydrochloride, 6R-BH4, tetrahydrobiopterin
- Where
- 13 sites in United States
- Volunteers
- 89 people
- Sponsor
- BioMarin Pharmaceutical
Phenylketonuria
The Brain, Neurological Features and Neuropsychological Functioning in Adults With Phenylketonuria: A Pilot Study
Newborn screening and early treatment prevent the most severe manifestations of phenylketonuria (PKU). However, executive functioning deficits, attention deficit disorder, slow processing speed, and visual-motor problems commonly…
- Trial name
- NCT01917344
- Testing
- MRI
- Where
- United States
- Volunteers
- 10 people
- Sponsor
- Boston Children's Hospital
Phenylketonuria
Phase 2 Study of Glycomacropeptide Versus Amino Acid Diet for Management of Phenylketonuria
For individuals with Phenylketonuria (PKU), the investigators hypothesize that glycomacropeptide will provide an acceptable form of low-phenylalanine dietary protein that will improve dietary compliance, blood phenylalanine…
- Trial name
- PKU (NCT01428258)
- Testing
- GMP Diet/GMP Medical Foods, AA Diet/AA Medical Foods
- Where
- 2 sites in United States
- Volunteers
- 32 people
- Sponsor
- University of Wisconsin, Madison
Albinism, Vision Loss
Nitisinone for Type 1B Oculocutaneous Albinism
Background: Oculocutaneous albinism, type 1B (OCA1B) is a genetic disease caused by problems in the gene that makes tyrosine. Tyrosine is an amino acid needed to produce pigment in the skin, hair, and eyes.
- Trial name
- NCT01838655
- Testing
- Nitisinone
- Where
- United States
- Volunteers
- 5 people
- Sponsor
- National Eye Institute (NEI)
Ornithine Transcarbamylase (OTC) Deficiency
Safety and Dose-Finding Study of DTX301 (scAAV8OTC) in Adults With Late-Onset Ornithine Transcarbamylase (OTC) Deficiency
This is a Phase 1/2, open-label, single arm, multicenter, safety and dose finding study of DTX301 in adults with late-onset OTC deficiency.
- Trial name
- CAPtivate (NCT02991144)
- Testing
- scAAV8OTC, Reactive Corticosteroid Taper Regimen, Prophylactic Corticosteroid Taper Regimen
- Where
- 9 sites in United States, Canada and 2 more
- Volunteers
- 16 people
- Sponsor
- Ultragenyx Pharmaceutical Inc
Phenylketonurias
Study of Phenoptin to Increase Phenylalanine Tolerance in Phenylketonuric Children on a Phenylalanine-restricted Diet
The primary objective of this trial is to evaluate the ability of Phenoptin to increase phenylalanine (phe) tolerance in children with phenylketonuria who are following a phe-restricted diet.
- Trial name
- NCT00272792
- Testing
- Sapropterin Dihydrochloride
- Where
- 9 sites in United States
- Volunteers
- 45 people
- Sponsor
- BioMarin Pharmaceutical
Type I Diabetes Mellitus
Glutamine and Insulin Sensitivity in Type I Diabetes
Insulin is crucial to help the body metabolize ('burn') sugar (glucose). Even though juvenile (type 1) diabetes (T1D) is primarily due to the lack of insulin, patients with T1D tend to become less sensitive to insulin…
- Trial name
- NCT01467063
- Testing
- Glutamine
- Where
- United States
- Volunteers
- 13 people
- Sponsor
- Nemours Children's Clinic
Alkaptonuria
Nitisinone (NTBC) In Different Age Groups Of Patients With Alkaptonuria
Nitisinone is a potent inhibitor of the enzyme that catalyzes the formation of homogentisic acid, and should be an even more logical treatment for alkaptonuria than for tyrosinemia, for which it has been approved by the FDA.The…
- Trial name
- NCT01390077
- Testing
- Nitisinone
- Where
- United States
- Volunteers
- 8 people
- Sponsor
- University of California, San Diego
Vitamin B6 Deficiency
Vitamin B6 Effects for Women Taking Birth Control Pills
Chronically inadequate B6 nutritional status is associated with aberrant one-carbon (1C) metabolism and health. Plasma pyridoxal phosphate (PLP) >30 nmol/L often has been considered to be the cutoff indicative of nutritional…
- Trial name
- NCT01128244
- Testing
- Vitamin B6, Infusion of labeled serine, methionine and leucine
- Where
- United States
- Volunteers
- 13 people, healthy volunteers welcome
- Sponsor
- University of Florida
Osteoarthritis
Muscle Regrowth During Physical Rehabilitation and Amino Acid Supplementation
The general hypothesis is that in older adults muscle regrowth after an acute musculoskeletal stress will be positively influenced by traditional physical rehabilitation, and further enhanced by nutritional supplementation.
- Trial name
- NCT00760383
- Testing
- Essential amino acids, Alanine
- Where
- 2 sites in United States
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- University of Oregon
Phenylketonuria
Kuvan® in Phenylketonuria Patients Less Than 4 Years Old
This is a Phase 3b, multicenter, open-label, randomized, controlled study to evaluate efficacy, safety and population pharmacokinetics of sapropterin dihydrochloride (Kuvan®) in less than 4 year-old infants and children with…
- Trial name
- SPARK (NCT01376908)
- Testing
- Kuvan®, Phenylalanine (Phe)-restricted diet
- Where
- 22 sites in Austria, Belgium and 7 more
- Volunteers
- 56 people
- Sponsor
- BioMarin Pharmaceutical
Hyperphenylalaninemia, Phenylketonuria
Bone Mineral Density in Adults With Hyperphenylalaninemia on Kuvan Therapy
Prospective study to compare the bone mineral density in adults with HPA on KUVAN™ therapy to those not on therapy. The investigators hypothesize that after one year of KUVAN™ therapy, there will be an improvement in their bone…
- Trial name
- NCT01541397
- Testing
- Sapropterin
- Where
- United States
- Volunteers
- 6 people, healthy volunteers welcome
- Sponsor
- The University of Texas Health Science Center, Houston
Optical Coherence Tomography (OCT) of the Retina
Low Cost OCT for Point of Care
The purpose of this study is to compare the performance of a prototype optical coherence tomography (OCT) machine with currently available high resolution OCT machines.
- Trial name
- NCT03323307
- Testing
- OCT imaging
- Where
- United States
- Volunteers
- 70 people
- Sponsor
- Duke University
Phenylketonuria
Efficacy and Safety of SYNB1934 in Patients With PKU (SYNPHENY-3)
SYNB1934-CP-003 was designed as a 3-part, adaptive study consisting of a dose-escalating, open-label period (DEP; Part 1) of up to 15 weeks, followed by a 4-week, double-blind, placebo-controlled, randomized withdrawal period…
- Trial name
- SYNPHENY-3 (NCT05764239)
- Testing
- SYNB1934v1
- Where
- 21 sites in United States, Canada and 2 more
- Volunteers
- 35 people
- Sponsor
- Synlogic
Phenylketonuria
Long-Term Extension of Previous rAvPAL-PEG Protocols in Subjects With PKU (PAL-003)
This study is an extension of previous rAvPAL-PEG studies. Administration of rAvPAL-PEG will be continued to assess whether long-term dosing of rAvPAL-PEG is safe and can maintain reduced blood Phe concentrations in PKU subjects.
- Trial name
- NCT00924703
- Testing
- rAvPAL-PEG
- Where
- 14 sites in United States
- Volunteers
- 68 people
- Sponsor
- BioMarin Pharmaceutical