Clinical trial NCT02221089: Effect of Retaron® on Oxygen Induced Retinal Vasoconstriction in LPS Induced Inflammatory Model in Humans
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Imparied Retinal Vascular Reactivity
Healthy Subjects
Keywords: Effect of Retaron on imparied retinal vascular reactivity after LPS administration in healthy subjects
Lead sponsor: Medical University of Vienna
Sponsor class: OTHER
First posted: 2014-08-20
Enrollment: 40
Sex: MALE
Minimum age (years): 18
Maximum age (years): 35
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: BASIC_SCIENCE

Brief summary: Oxidative stress has been implicated to play a pathogenic role in many disease processes, especially in age-related disorders such as age-related macular degeneration. 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 effect of the antioxidative properties of a certain drug or vitamin combination is hard to investigate. In the current study, we propose to investigate the effect of Retaron®, a combination of carotoinoids, omega-3-fatty acids, a herbal extract of Aronia, vitamins and trace elements, 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 Retaron®. 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.


Eligibility criteria: Inclusion Criteria:

* 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, ametropy \< 3 Dpt.

Exclusion Criteria:

* 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

Primary outcomes:
measure: Change in Retinal Vascular Reactivity
timeFrame: Study day 1 and 2
Secondary outcomes:
measure: Change in Ocular blood flow
timeFrame: Study day 1 and 2
measure: Change in impaired endothelial function
timeFrame: Study day 1 and 2
measure: Change in antioxidative capacity
timeFrame: Study day 1 and 2
Other outcomes:
Locations:
city: Vienna
country: Austria
facility: Department of clinical Pharmacology, Medical University of Vienna
Study officials:
References:
citation: Kolodjaschna J, Berisha F, Lung S, Schaller G, Polska E, Jilma B, Wolzt M, Schmetterer L. LPS-induced microvascular leukocytosis can be assessed by blue-field entoptic phenomenon. Am J Physiol Heart Circ Physiol. 2004 Aug;287(2):H691-4. doi: 10.1152/ajpheart.01240.2003. Epub 2004 Mar 11.
citation: Kolodjaschna J, Berisha F, Lasta M, Polska E, Fuchsjager-Mayrl G, Schmetterer L. Reactivity of retinal blood flow to 100% oxygen breathing after lipopolysaccharide administration in healthy subjects. Exp Eye Res. 2008 Aug;87(2):131-6. doi: 10.1016/j.exer.2008.05.006. Epub 2008 May 18.
citation: Suffredini AF, Hochstein HD, McMahon FG. Dose-related inflammatory effects of intravenous endotoxin in humans: evaluation of a new clinical lot of Escherichia coli O:113 endotoxin. J Infect Dis. 1999 May;179(5):1278-82. doi: 10.1086/314717.
citation: Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 8. Arch Ophthalmol. 2001 Oct;119(10):1417-36. doi: 10.1001/archopht.119.10.1417.
citation: Violi F, Cangemi R. Antioxidants and cardiovascular disease. Curr Opin Investig Drugs. 2005 Sep;6(9):895-900.