Oxidative Stress Markers In Inherited Homocystinuria And The Impact Of Taurine (NCT01192828) | Clinical Trial Compass
CompletedPhase 1/2
Oxidative Stress Markers In Inherited Homocystinuria And The Impact Of Taurine
United States15 participantsStarted 2010-01
Plain-language summary
Cystathionine beta-synthase deficiency is an inherited disease that results in elevation of a substance called homocysteine (Hcy) in blood and urine. Individuals with this disorder have a very high risk for developing blood clots and are at risk for developing eye and bone abnormalities. Current treatments are generally difficult to follow and can fail. Development of additional therapies has been limited by lack of understanding of how the disease works.
The purpose of this study is to see if oxidative stress and inflammation are involved in the disease process and if short-term supplementation with taurine is an effective treatment.
Funding source: FDA.
Who can participate
Age range8 Years – 49 Years
SexALL
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Inclusion criteria
✓. A confirmed biochemical, molecular, or enzymatic diagnosis of classic homocystinuria due to cystathionine beta-synthase deficiency (OMIM 236200)
✓. And not fully responsive to therapy (eg, total homocysteine (tHcy) levels above 50 µmol/L on therapy including on B6 therapy)
✓. Be over 8 years old and less than 50 years. The first four patients will be adults (age 18-50 years)
✓. Be able and willing to provide informed consent
Exclusion criteria
✕. Pregnancy: Females who are pregnant or lactating will be excluded from the study as the influence of pregnancy on the markers is not known nor is the safety of taurine supplementation in pregnancy.
✕. Continued antioxidant intake:
✕. Individuals currently taking taurine, over the counter energy drinks containing taurine or other high dose antioxidants and unwilling to discontinue this for the study period (including a 2 week wash out period) will be excluded as such intake will likely impact laboratory results.
✕
What they're measuring
1
Difference in Thiobarbituric Acid Reactive Substances (TBARS) in Individuals With Cystathionine Beta Synthase Deficient Homocystinuria (CBSDH) Pre and Post Taurine Treatment.
Timeframe: Baseline and after 4 days of therapy.
2
Difference in Tumor Necrosis Factor Alpha (TNF-alpha) in Individuals With CBSDH Pre and Post Taurine Treatment.
Timeframe: Baseline and after 4 days of treatment.
. Individuals taking Vitamin C as a prescribed treatment for their homocystinuria will be excluded as the antioxidant therapy may impact antioxidant and inflammation markers. (As Vitamin C is not standard of care for this disease we anticipate this to have minimal impact on recruitment.)
✕. Individuals currently taking platelet aggregation inhibitors such as salicylate on a self prescribed basis and unwilling to discontinue this for the study period (including a washout period of at least two weeks prior to the study) will be excluded as salicylate intake will impact platelet study results. Individuals taking salicylate (or other platelet aggregation inhibitors) prescribed as a therapy for their homocystinuria or other health issues will not be asked to stop the medication. They will participate in the study, but will be excluded only from the platelet studies.
✕. Medication interactions: Individuals unable or unwilling to abstain from use of cyclic guanosine monophosphate (cGMP) phosphodiesterase 5 inhibitors (such as Viagra) during the study period will be excluded from the nitroglycerin-induced flow-mediated dilatation studies in accordance with known labeling contraindications.
✕. Inflammatory status:
✕. Individuals who have a significant chronic illness that has a marked inflammatory component will be excluded from the study as the illness will impact inflammatory markers.