HealthyNCT00914576
Effect of Antioxidants on Oxygen Induced Vasoconstriction in Lipopolysaccharide (LPS) Induced Inflammatory Model in Humans
A study testing Vitamin and mineral supplement, 100% Oxygen and Escherichia coli Endotoxin in people with Healthy, run by Medical University of Vienna at 1 site in Austria.
Trial summary
Oxidative stress has been implicated in playing a pathogenic role in many disease processes, especially in age-related disorders. It has been hypothesized that antioxidative agents such as vitamins and minerals, which are capable of scavenging free radicals, may reduce oxidative stress and may, in turn, be beneficial… Read more about this study
- Who is it for?
- Ages 18 to 35 years, men onlyHealthy volunteers can take part
- Conditions the study is for
- Healthy
- What is being tested?
- Vitamin and mineral supplement, 100% Oxygen and Escherichia coli Endotoxin
- Type of treatment
- Pill or oral medicine, Injection or infusion
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 40 participants
- Where
- 1 siteAustria
- Study dates
- Apr 2011to Jul 2013
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 35 years
- Men only
- Healthy volunteers accepted
- Adult
Who may be able to join
- Men aged between 18 and 35 years, nonsmokers
- Body mass index between 15th and 85th percentile (Must et al. 1991)
- Normal findings in the medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant
- Normal laboratory values unless the investigator considers an abnormality to be clinically irrelevant
- Normal ophthalmic findings, ametropia < 3 Dpt
Who cannot join
- Regular use of medication, abuse of alcoholic beverages, participation in a clinical trial in the 3 weeks preceding the study
- Treatment in the previous 3 weeks with any drug, vitamins and minerals supplements as well
- Symptoms of a clinically relevant illness in the 3 weeks before the first study day
- History of hypersensitivity to the trial drug or to drugs with a similar chemical structure
- History or presence of gastrointestinal, liver or kidney disease, or other conditions known to interfere with, distribution, metabolism or excretion of study drugs
- Blood donation during the previous 3 weeks
Trial locations and contacts
1 site in 1 country.
Austria1 site
Department of Clinical Pharmacology, Medical University of Vienna
Vienna, 1090
About this study
Official title: Effect of Antioxidants on Oxygen Induced Vasoconstriction in LPS Induced Inflammatory Model in Humans
Oxidative stress has been implicated in playing a pathogenic role in many disease processes, especially in age-related disorders. It has been hypothesized that antioxidative agents such as vitamins and minerals, which are capable of scavenging free radicals, may reduce oxidative stress and may, in turn, be beneficial for patients with age-related disorders. Based on this hypothesis, several different combinations of vitamins have been introduced, all targeting at reducing oxidative stress. However, the in-vivo determination of the antioxidative properties of a certain drug or vitamin combination are hard to determine. In the current study, the researchers propose to investigate the effect of VITAMAC®, a combination of vitamins and minerals, in a systemic in-vivo inflammation model.
In the present study, the infusion of LPS, which is a cell wall component of Gram-negative bacteria and a major mediator in the pathogenesis of septic shock, will be used as a standardized experimental model of systemic inflammation in humans. Given that inflammation is associated with enhanced oxidative stress and widespread endothelial dysfunction, the LPS model is well suitable for determination of the antioxidative effects of VITAMAC®. As a main outcome parameter, the vascular reactivity of retinal vessels to systemic hyperoxia (induced by breathing 100% oxygen) will be tested in presence or absence of the antioxidant combination.
- Conditions
- Healthy
- Being tested
- Vitamin and mineral supplement, Placebo, 100% Oxygen, Escherichia coli Endotoxin
- Keywords
- Endotoxin, Escherichia Coli, Retina, Regional Blood Flow
- Medical subject headings
- Escherichia coli Infections
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Vitamin and mineral supplementDrug
Also called Vitamac Day
1 capsule/day in the morning for 14 days, containing: Lutein 12mg, Vitamin C 300mg, Zinc 10mg, Ginko Biloba 10mg, Flavonoids 25mg, Fish oil 300mg
Vitamin and mineral supplementDrug
1 capsule/day in the evening for 14 days, containing: Zeaxanthin 5mg, Vitamin E 60mg, Copper 1mg, Selene 20µg, Ginko Biloba 10mg, Flavonoids 25mg, Alpha Lipon acid: 150mg
PlaceboDrug
2 capsules/day for 14 days
100% OxygenDrug
breathing of 100% O2 for 30 minutes on both study days
Escherichia coli EndotoxinDrug
Also called LPS (US Standard)
Escherichia coli Endotoxin (LPS, US Standard Reference Endotoxin, dose: 2 ng/kg bodyweight (corresponding to 20 IU/kg), i.v. bolus on both study days.
| Study group | Role | What they receive |
|---|---|---|
| 1 | Active comparator | Not described Receives: Drug: Vitamin and mineral supplement; Drug: 100% Oxygen; Drug: Escherichia coli Endotoxin |
| 2 | Placebo comparator | Not described Receives: Drug: Placebo; Drug: 100% Oxygen; Drug: Escherichia coli Endotoxin |
What is being measured
The primary outcome is the main question the study is designed to answer.
Retinal blood flow
Measured: 1 year
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted5 Jun 2009 (estimated)
- Study startApr 2011
- Primary completionJul 2013
- Study completionJul 2013
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (2)Papers the sponsor has linked to this study.
- Other trials for HealthyStudies of the same condition, open and under way.
- More trials run by Medical University of ViennaThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind
- Who is masked
- Participant, Investigator, Outcomes assessor
- Enrolment
- 40 participants (actual)
Sponsor and investigators
- Lead sponsor
- Medical University of Vienna
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Gerhard Garhofer, Medical University of Vienna
- Investigators
- Gerhard Garhofer, MD, Principal investigator, Department of Clinical Pharmacology, Medical University of Vienna
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00914576
- Sponsor's protocol ID
- OPHT-101108
- Status last verified
- Jul 2013
- First submitted
- 3 Jun 2009
- Last updated
- 24 Jul 2013
- Results posted
- No
- Data monitoring committee
- Yes
Publications
Told R, Schmidl D, Palkovits S, Boltz A, Gouya G, Wolzt M, Witkowska KJ, Popa-Cherecheanu A, Werkmeister RM, Garhofer G, Schmetterer L. Antioxidative capacity of a dietary supplement on retinal hemodynamic function in a human lipopolysaccharide (LPS) model. Invest Ophthalmol Vis Sci. 2014 Dec 18;56(1):403-11. doi: 10.1167/iovs.14-15581.
PubMed 25525163Told R, Palkovits S, Schmidl D, Boltz A, Gouya G, Wolzt M, Napora KJ, Werkmeister RM, Popa-Cherecheanu A, Garhofer G, Schmetterer L. Retinal hemodynamic effects of antioxidant supplementation in an endotoxin-induced model of oxidative stress in humans. Invest Ophthalmol Vis Sci. 2014 Apr 7;55(4):2220-7. doi: 10.1167/iovs.13-13784.
PubMed 24576874
Study at a glance
From the registry record, last updated by the sponsor on 24 Jul 2013. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effect of Antioxidants on Oxygen Induced Vasoconstriction in LPS Induced Inflammatory Model in Humans
- ClinicalTrials.gov ID
- NCT00914576
- Acronym / sponsor ID
- OPHT-101108
- Conditions
- Healthy
- Keywords
- Endotoxin, Escherichia Coli, Retina, Regional Blood Flow
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 40 participants (actual)
- Lead sponsor
- Medical University of ViennaUniversity, hospital or other
- Study start
- Apr 2011
- Primary completion
- Jul 2013 (actual)
- Study completion
- Jul 2013 (actual)
- First posted
- 5 Jun 2009 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Oxidative stress has been implicated in playing a pathogenic role in many disease processes, especially in age-related disorders. It has been hypothesized that antioxidative agents such as vitamins and minerals, which are capable of scavenging free radicals, may reduce oxidative stress and may, in turn, be beneficial for patients with age-related disorders. Based on this hypothesis, several different combinations of vitamins have been introduced, all targeting at reducing oxidative stress. However, the in-vivo determination of the antioxidative properties of a certain drug or vitamin combination are hard to determine. In the current study, the researchers propose to investigate the effect of VITAMAC®, a combination of vitamins and minerals, in a systemic in-vivo inflammation model.
In the present study, the infusion of LPS, which is a cell wall component of Gram-negative bacteria and a major mediator in the pathogenesis of septic shock, will be used as a standardized experimental model of systemic inflammation in humans. Given that inflammation is associated with enhanced oxidative stress and widespread endothelial dysfunction, the LPS model is well suitable for determination of the antioxidative effects of VITAMAC®. As a main outcome parameter, the vascular reactivity of retinal vessels to systemic hyperoxia (induced by breathing 100% oxygen) will be tested in presence or absence of the antioxidant combination.
Study design
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind (participant, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| 1 | Active comparator | Drug: Vitamin and mineral supplement, Drug: 100% Oxygen, Drug: Escherichia coli Endotoxin |
| 2 | Placebo comparator | Drug: Placebo, Drug: 100% Oxygen, Drug: Escherichia coli Endotoxin |
Who may qualify
- Ages
- 18 to 35 years
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (5 listed)
- Men aged between 18 and 35 years, nonsmokers
- Body mass index between 15th and 85th percentile (Must et al. 1991)
- Normal findings in the medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant
- Normal laboratory values unless the investigator considers an abnormality to be clinically irrelevant
- Normal ophthalmic findings, ametropia < 3 Dpt
Key exclusion criteria (6 listed)
- Regular use of medication, abuse of alcoholic beverages, participation in a clinical trial in the 3 weeks preceding the study
- Treatment in the previous 3 weeks with any drug, vitamins and minerals supplements as well
- Symptoms of a clinically relevant illness in the 3 weeks before the first study day
- History of hypersensitivity to the trial drug or to drugs with a similar chemical structure
- History or presence of gastrointestinal, liver or kidney disease, or other conditions known to interfere with, distribution, metabolism or excretion of study drugs
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Vitamin and mineral supplementAlso: Vitamac Day1 capsule/day in the morning for 14 days, containing: Lutein 12mg, Vitamin C 300mg, Zinc 10mg, Ginko Biloba 10mg, Flavonoids 25mg, Fish oil 300mg | Drug | 1 |
| Vitamin and mineral supplement1 capsule/day in the evening for 14 days, containing: Zeaxanthin 5mg, Vitamin E 60mg, Copper 1mg, Selene 20µg, Ginko Biloba 10mg, Flavonoids 25mg, Alpha Lipon acid: 150mg | Drug | 1 |
| Placebo2 capsules/day for 14 days | Drug | 2 |
| 100% Oxygenbreathing of 100% O2 for 30 minutes on both study days | Drug | 1, 2 |
| Escherichia coli EndotoxinAlso: LPS (US Standard)Escherichia coli Endotoxin (LPS, US Standard Reference Endotoxin, dose: 2 ng/kg bodyweight (corresponding to 20 IU/kg), i.v. bolus on both study days. | Drug | 1, 2 |
Primary outcome
Retinal blood flow
Time frame: 1 year
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 24 Jul 2013.
- Derived from this study: PubMed 25525163Told R, Schmidl D, Palkovits S, Boltz A, Gouya G, Wolzt M, Witkowska KJ, Popa-Cherecheanu A, Werkmeister RM, Garhofer G, Schmetterer L. Antioxidative capacity of a dietary supplement on retinal hemodynamic function in a human lipopolysaccharide (LPS) model. Invest Ophthalmol Vis Sci. 2014 Dec 18;56(1):403-11. doi: 10.1167/iovs.14-15581.
- Derived from this study: PubMed 24576874Told R, Palkovits S, Schmidl D, Boltz A, Gouya G, Wolzt M, Napora KJ, Werkmeister RM, Popa-Cherecheanu A, Garhofer G, Schmetterer L. Retinal hemodynamic effects of antioxidant supplementation in an endotoxin-induced model of oxidative stress in humans. Invest Ophthalmol Vis Sci. 2014 Apr 7;55(4):2220-7. doi: 10.1167/iovs.13-13784.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Gerhard Garhofer, MD principal investigator
Department of Clinical Pharmacology, Medical University of Vienna
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Vitamin and mineral supplement, 100% Oxygen and Escherichia coli Endotoxin in people with Healthy, run by Medical University of Vienna at 1 site in Austria.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 24 Jul 2013. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Austria. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Retinal blood flow (time frame: 1 year). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00914576, which also lists 2 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 24 Jul 2013.