Recombinant Human Superoxide Dismutase (rhSOD) and Vascular Reactivity

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00264186
Recruitment Status : Completed
First Posted : December 12, 2005
Last Update Posted : May 22, 2008
Polymun Scientific, Vienna, Austria
Information provided by:
Medical University of Vienna

Brief Summary:
Inflammation is characterised by an increased risk for cardiovascular events. Dysfunction of the vascular endothelium caused by oxidative stress might provide a mechanistic link. In acute and chronic inflammation, oxidative stress occurs when the production of reactive oxygen species [ROS] (including superoxide anions [O2-]) exceeds the capacity of the endogenous antioxidant defense systems, resulting in ROS-mediated damage. Recombinant human superoxide dismutase (rhSOD) has shown potent antioxidant properties in in-vitro and animal studies and has been tested in phase I clinical trials in humans. rhSOD could offer a therapeutic option for vascular dysfunction in diseases associated with increased oxidative stress. The investigators, therefore, want to test if the hyporesponsiveness to vasoactive drugs (norepinephrine, acetylcholine and glyceroltrinitrate) during acute inflammation by low-dose lipopolysaccharide (LPS) is due to the increased production of superoxide anions, which could be scavanged by the radical scavenger rhSOD.

Condition or disease Intervention/treatment Phase
Inflammation Drug: LPS 2 ng/kg intravenous (IV) bolus Drug: rhSOD 82,000 IU (8.2 mg)/min intraarterially Drug: Norepinephrine 60, 120, 240 pmol/min intraarterially over 5 min/dose level (two times; pre-dose and +3.5 hrs) Drug: Acetylcholine 6.25, 12.5, 25 nmol/min intraarterially over 3 min/dose level (two times; pre-dose and +3.5 hrs) Drug: Glyceroltrinitrate (nitroglycerine) 4, 8, 16 nmol/min over 3 min/dose level (two times; pre-dose and +3.5 hrs) Phase 1

Study Type : Interventional  (Clinical Trial)
Enrollment : 43 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double
Official Title: Impact of rhCu/Zn SOD on Inflammation-Induced Impairment of Vascular Reactivity
Study Start Date : June 2005

Primary Outcome Measures :
  1. Forearm blood flow responses to acetylcholine, nitroglycerine and norepinephrine (ratio between intervention and control arm)

Secondary Outcome Measures :
  1. Markers of inflammation and oxidative stress, change in MAP, change in pulse rate, subjective symptoms and body temperature; antibodies against rhSOD

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Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Men aged between 18 and 45 years
  • Nonsmokers
  • Body mass index between 15th and 85th percentile
  • Normal findings in medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant

Exclusion Criteria:

  • Regular use of medication, abuse of alcoholic beverages, or participation in a clinical trial in the 3 weeks preceding the study
  • Evidence of hypertension, pathologic hyperglycemia, or hyperlipidemia
  • Treatment in the previous 3 weeks with any drug
  • Symptoms of a clinically relevant illness in the 3 weeks before the first study day
  • 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
  • History of hypersensitivity to the trial drug or to drugs with a similar chemical structure

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00264186

Medical University of Vienna - General Hospital of the City of Vienna AKH
Vienna, Austria, 1090
Sponsors and Collaborators
Medical University of Vienna
Polymun Scientific, Vienna, Austria
Principal Investigator: Michael Wolzt, MD Medical University of Vienna Identifier: NCT00264186     History of Changes
Other Study ID Numbers: LPS-rhSOD
First Posted: December 12, 2005    Key Record Dates
Last Update Posted: May 22, 2008
Last Verified: May 2008

Additional relevant MeSH terms:
Pathologic Processes
Superoxide Dismutase
Adrenergic alpha-Agonists
Adrenergic Agonists
Adrenergic Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs
Autonomic Agents
Peripheral Nervous System Agents
Vasoconstrictor Agents
Vasodilator Agents
Cholinergic Agonists
Cholinergic Agents
Free Radical Scavengers
Protective Agents