Healthy Volunteers
Conditions
Keywords
hemin, heme oxygenase, humans, HO-1
Brief summary
This study is being done because we want to learn if hemin can increase the production of heme oxygenase 1. Heme oxygenase 1 (HO-1) is an enzyme which protects cells from physical, chemical, and biologic stress. Hemin is produced from red blood cells and is approved by the Food and Drug Administration for treating acute porphyria, which is an inherited condition caused by an enzyme deficiency.
Detailed description
Heme-oxygenase 1 (HO-1) degrades heme, protects cells against oxidative stress, and is beneficial in several experimental models but has not been pharmacologically activated in humans. The objectives of this study were to evaluate the effects of hemin on HO-1 activity in healthy subjects. Hemin is the most powerful inducer of HO-1. Hemin is FDA-approved to treat acute intermittent porphyria. In addition, hemin has also been used to treat thalassemia intermedia, myelodysplastic syndrome, and to control liver allograft failure due to recurrence of erythropoietic prototheria. Our hypothesis is that compared to placebo, hemin will increase HO-1 in humans. Ten healthy subjects will be randomized to hemin (n = 5, Panhematin®, Ovation Pharmaceuticals, 3 mg/kg i.v. in 25% albumin) or placebo (n = 5, 25% albumin) infusion. HO-1 activity will be assessed before and after (4, 6, 24, and 48 hours) infusions.
Interventions
DRUGHemin infusion
Hemin (Panhematin®, Ovation Pharmaceuticals, Deerfield, IL) will be administered through a large-caliber peripheral vein at a dose of 1.25 mL/kg and at a rate of 60 mL/hour. To enhance stability, Panhematin® will be diluted in \ 132 mL of 25% albumin to obtain a hemin concentration of 2.4 mg/mL.
DRUGplacebo infusion
25 % albumin will be administered through a large-caliber peripheral vein at a dose at a rate of 60 mL/hour.
Sponsors
Mayo Clinic
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 65 Years
Healthy volunteers
Yes
Inclusion criteria
1. Healthy non pregnant not breast feeding, and non-smoking subjects aged 18 - 65 years old without clinical evidence of significant cardiovascular, gastrointestinal, hematological, neurological, psychiatric or other disease that may interfere with the objectives of the study and/or pose safety concerns. No symptoms of functional GI disorder as assessed by a validated questionnaire. 2. No medications except for stable doses of oral contraceptives or thyroid supplementation. Because ascorbic acid can induce HO-1 activity, multivitamins will need to be discontinued for 1 week before and for the duration of the study. 3. No intolerance or allergy to eggs 4. Able to provide written informed consent before participating in the study 5. Able to communicate adequately with the investigator and to comply with the requirements for the entire study 6. Screening weight \< 96 kg
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Venous carboxyhemoglobin concentrations | at 6 hours |
| HO-1 protein concentration in leukocytes from venous blood | at 6 hours |
| Serum bilirubin | at 6 hours |
Secondary
| Measure | Time frame |
|---|---|
| Venous carboxyhemoglobin concentrations | at 4, 24, and 48 hours |
| HO-1 activity in leukocytes from venous blood | at 4, 24, and 48 hours |
| Serum bilirubin | at 4, 24, and 48 hours |
Countries
United States
Outcome results
None listed