Normal Binding of R-[11C]PK11195 in Human Subjects

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: NCT00205595
Recruitment Status : Unknown
Verified July 2008 by VU University Medical Center.
Recruitment status was:  Active, not recruiting
First Posted : September 20, 2005
Last Update Posted : July 8, 2008
Information provided by:
VU University Medical Center

September 12, 2005
September 20, 2005
July 8, 2008
February 2001
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specific binding of tracer depending on age
Same as current
Complete list of historical versions of study NCT00205595 on Archive Site
tracer kinetic method
Same as current
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Normal Binding of R-[11C]PK11195 in Human Subjects
The Distribution and Quantification of Specific Binding of the Positron Emission Tomography Tracer R)-[11C]PK11195 in Normal Human Subjects
This is a study using Positron Emission Tomography (PET) to study the normal distribution of the PET ligand (R)-[11C]PK11195. This ligand will be used to study inflammation in the brain in several brain disorders like Alzheimer's disease and traumatic brain injury.

At the University Hospital Vrije Universiteit the PET ligand PK11195 labeled with carbon-11, (R)-[11C]PK11195, will be used to study microglia activation in-vivo in patients with traumatic brain damage, Alzheimer disease, multiple sclerosis and neuritis optica, disorders with unknown pathophysiology and treatment difficulties.

PK11195 (1-(2-chlorophenyl)-N-methyl-N-1(1-methylpropyl)-3 isoquinolinecarboxamide) is a highly specific ligand for the peripheral benzodiazepine-binding site, which is particularly abundant on cells of the mononuclear macrophage line (Myers et al., 1991). In normal human brain, the peripheral-type benzodiazepine receptor ligand PK11195 exhibits low to minimal binding primarily associated with the choroid plexus, ependymal linings and glial cells. However, following neuronal damage, the cells involved in the ensuing gliosis, microglia, show a marked increase in expression of these sites (Stephenson et al., 1995;Conway et al., 1998).

PK11195 labeled with carbon-11 is a PET ligand to peripheral type benzodiazepine receptors which has already been used in patients with stroke (Ramsay et al., 1992), Rasmussen's encephalitis (Banati et al., 1999), multiple sclerosis (Banati et al., 1997) and facial nerve lesions (Myers et al., 1999). However, no tracer kinetic model for quantification has been fully validated for(R)-[11C]PK11195. In order to use (R)-[11C]PK11195 for PET-imaging of microglia activation and to use it in the longitudinal monitoring of disease progression, baseline levels of ligand uptake in a healthy control population are required. This study aims to measure (R)-[11C]PK11195 uptake in normal brain in different age groups and to develop methods for quantification of specific binding of (R)-[11C]PK11195. Because (R)-[11C]PK11195 uptake depends on regional bloodflow, each (R)-[11C]PK11195 scan will be preceded by a cerebral bloodflow scan with H215O.


  • Determine the distribution of (R)-[11C]PK11195 in normal brain
  • Develop methods for quantification of specific binding of (R)-[11C]PK11195
  • Determine the metabolic profile of (R)-[11C]PK11195 in healthy volunteers

DESIGN OF THE STUDY Forty healthy subjects will be recruited, 20 males and 20 females. This is an open study. The study consists of one PET scan, which will be performed at the Department of Nuclear Medicine & PET research of the VU University Medical Centre.

Phase 1
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Normal Aging
Device: Positron Emission Tomography
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*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Unknown status
Same as current
January 2007
Not Provided

Inclusion Criteria:

  • Male and female subjects
  • Good physical and mental Health which will be evaluated with medical history, a physical examination and screening laboratory tests (see appendix 1).
  • Age between 18 and 40 years (20 subjects) and between 40 and 80 years (20 subjects).
  • Mini Mental State score >27
  • Body Mass Index (B.M.I.) between 20 -25.
  • Written informed consent of the subject.
  • Hb must be >8 mmol \ liter at the time of the screening.

Exclusion Criteria:

  • Previous neurotrauma with loss of consciousness
  • Any clinical significant abnormality of any clinical laboratory test, including drug screening, or ECG abnormality.
  • History of hypertension
  • Any subject who has received any investigational medication within 30 days prior to the start of this study, or who is scheduled to receive an investigational drug.
  • History of psychiatric or neurological illness
  • History of psychiatric or neurological illness in first-degree relatives
  • History of alcohol and/or drug abuse (DSM-IV criteria)
  • Current use of any medication
  • Blood donation within 3 months before the scan day
  • Claustrophobia
  • Metal objects in or around the body (braces, pacemaker, metal fragments);
Sexes Eligible for Study: All
18 Years to 80 Years   (Adult, Older Adult)
Contact information is only displayed when the study is recruiting subjects
no other ID's
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VU University Medical Center
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Principal Investigator: Bart van Berckel, MD; PhD VUmc Medical Centre
VU University Medical Center
July 2008

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP