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Completed

NCT Number: NCT03520543

[11C]Yohimbine PET Study of alpha2-AR

The main purpose of this study is to model tissue specific kinetics of [11C]Yohimbine in healthy male participants by positron emission tomography (PET) and the appropriate arterial input function (part A) ; to determine the reproducibility of measures (classical test-retest study, part B1) and to measure the blocking of [11C]Yohimbine uptake in the brain following single oral dose administration of clonidine (part B2).

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Key information

Conditions

Healthy Controls

Age range

20 year–35 year

Sex eligibility

Male

Study type

Interventional

Phase

Phase 1

Primary location

Service de Neurologie C - Hôpital Neurologique et Neurochirurgical Pierre Wertheimer, GHE

Bron, 69500, France

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Healthy male volunteers
  • Age between 20 years and 35 years
  • Weight between 50kg and 90kg
  • Without neurologic or psychiatric history
  • Without head trauma history including loss of consciousness superior to 30 minutes.
  • Affiliated to a social security or similar scheme
  • Not subject to any legal protection measures
  • Participant must have signed an informed consent document indicating that they understand the purpose of, and procedures required for, the study and are willing to participate in the study and comply with the study procedures and restrictions

Exclusion criteria

  • Allen test (assessing the arterial blood flow to the hand) indicating abnormal blood supply to the hand
  • Subject with orthostatic hypotension
  • Subject with alcohol or substance abuses history
  • Subject with somatic drug therapies
  • MRI contraindications (implanted or embedded metal objects in the head or body)
  • PET contraindications
  • Clonidine contraindications
  • Exposed to 1 millisievert or more of ionizing radiation in the year before the start of this study
  • Subject unable to sign written consent for participation in the study

Treatment and study plan

[11C]Yohimbine

Drug

Each subject will receive an intravenous (IV) bolus injection of [11C]Yohimbine at a dose of 370 MegaBecquerel (MBq) ± 10% with concomitant arterial blood sampling. The distribution of [11C]Yohimbine in brain will be measured by dynamic PET scans obtained from the time of injection for up to 90 minutes along with measurement of the tracer input function with arterial samples for intact tracer and metabolites to establish the total and regional compartmental kinetics of [11C]Yohimbine.

[11C]Yohimbine (Part B1) and [11C]Yohimbine + clonidine (Part B2)

Drug

Part B1 : Test Retest Variability will be assessed on percent difference in the binding potential following [11C]Yohimbine PET scan (IV bolus injection of [11C]Yohimbine at a dose of 370 MBq ± 10%) obtained at least 1 week after [11C]Yohimbine PET scan of part A.

Part B2 : Occupancy of alpha2-adrenergic receptors in brain by clonidine will be evaluated by comparing the binding potential of [11C]Yohimbine (IV bolus injection of [11C]Yohimbine at a dose of 370 MBq ± 10%) after single oral dose of clonidine (0,15mg) to the binding potential of [11C]Yohimbine obtained at baseline (part A).

Primary outcomes

  1. Binding potentials

    Time frame: 180 minutes

    Binding potentials are calculated using compartmental modelling techniques

Secondary outcomes

  1. Number of participants with adverse events as a measure of safety and tolerability

    Time frame: Up to 7 days after part B

    An adverse effect is any untoward medical events that occur in a participant administered an investigational product, and it does not necessarily indicate only events with clear causal relationship with the relevant investigational product

Sponsors and collaborators

Lead sponsor

Hospices Civils de Lyon

Other

Registry information

Official study title

Positron Emission Tomography Study of alpha2-adrenergic Receptors With [11C]Yohimbine

Acronym: [11C]Yohimbine

Important dates

Study start
2018
Primary completion
2018
Study completion
2019
First posted
May 9, 2018
Registry last updated
Sep 12, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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