Adenosine Receptors Influence Ischemia-Reperfusion Injury

March 27, 2008 updated by: Radboud University Medical Center

Adenosine Receptor Involvement in Acute Ischemic Preconditioning of the Vascular Endothelium

Ischemic preconditioning is defined as the development of tolerance to ischemia-reperfusion injury by a previous short bout of ischemia resulting in a marked reduction in infarct size. This mechanism can be mimicked by several pharmacological substances such as acetylcholine and adenosine.

To detect ischemia-reperfusion injury in humans in vivo Kharbanda et al. developed a method in which endothelial dysfunction represents the effects of ischemic preconditioning. This method, however, uses acetylcholine to measure endothelial function before and after forearm ischemia. We, the investigators at Radboud University, hypothesize that the use of acetylcholine in this model reduces ischemia-reperfusion injury. Therefore, we will compare this protocol with a protocol in which endothelial function is only measured after ischemia. We expect an increase in ischemia-reperfusion injury when endothelial function is only measured after the forearm ischemia.

After determining the optimal method to measure ischemia-reperfusion injury of the vascular endothelium we will determine the effect of acute and chronic caffeine, an adenosine receptor antagonist, on ischemic preconditioning. With this study we expect to find that adenosine mimics ischemic preconditioning of the vascular endothelium. Moreover, we expect to find that acute caffeine intake reduces ischemia-reperfusion injury whereas chronic caffeine intake does not. This study will increase our knowledge about the mechanism of ischemic preconditioning and may also provide leads to exploit this endogenous protective mechanism in a clinical setting.

Study Overview

Status

Suspended

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Anticipated)

8

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Netherlands
    • Gelderland
      • Nijmegen, Gelderland, Netherlands, 6500 HB
        • Radboud University Nijmegen Medical Centre/Department of Pharmacology and Toxicology

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 50 years (ADULT)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Healthy volunteers

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Allocation: RANDOMIZED
  • Interventional Model: CROSSOVER
  • Masking: DOUBLE

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Percentual increase in forearm blood flow ratio to three increment dosages of acetylcholine before forearm ischemia and within two hours after forearm ischemia

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Radboud University Medical Center

Investigators

  • Principal Investigator: Gerard Rongen, MD, PhD, Radboud University Nijmegen Medical Centre/Department of Pharmacology and Toxicology

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

March 1, 2005

Study Registration Dates

First Submitted

September 12, 2005

First Submitted That Met QC Criteria

September 12, 2005

First Posted (ESTIMATE)

September 16, 2005

Study Record Updates

Last Update Posted (ESTIMATE)

March 28, 2008

Last Update Submitted That Met QC Criteria

March 27, 2008

Last Verified

March 1, 2008

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • ACAD

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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