Clin Psychopharmacol Neurosci.  2011 Dec;9(3):111-116.

Occupancy of alpha7 Nicotinic Acetylcholine Receptors in the Brain by Tropisetron: A Positron Emission Tomography Study Using [11C]CHIBA-1001 in Healthy Human Subjects

Affiliations
  • 1Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan. hashimoto@faculty.chiba-u.jp
  • 2Positron Medical Center, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan.
  • 3Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba, Japan.

Abstract

OBJECTIVE: Agonists of alpha7-nicotinic acetylcholine receptors (nAChRs) have been developed as potential therapeutic drugs for neuropsychiatric diseases such as schizophrenia and Alzheimer's disease. Positron emission tomography (PET) is a noninvasive brain imaging technique to measure receptor occupancy in the living human brain. Although much effort has been expended to create specific PET radioligands for alpha7-nAChRs in the brain, only 4-[11C]methylphenyl-1,4-diazabicyclo[3.2.2.]nonane-4-carboxylate ([11C]CHIBA-1001) is currently available for clinical studies. In contrast, two 5-hydroxytryptamine-3 (5-HT3) receptor antagonists, tropisetron and ondansetron, have been used to treat patients with chemotherapy-induced or postoperative nausea and vomiting. Furthermore, tropisetron, but not ondansetron, possesses high affinity for alpha7-nAChRs. In the present study, we evaluated the receptor occupancy in the human brain after a single oral administration of tropisetron and ondansetron using [11C]CHIBA-1001 and PET.
METHODS
Two serial dynamic PET scans using [11C]CHIBA-1001 in healthy non-smoking male subjects were performed before and after receiving an oral administration of these medications.
RESULTS
A single oral administration of tropisetron, but not ondansetron, decreased the total distribution volume of [11C]CHIBA-1001 in the human brain.
CONCLUSION
This study shows that tropisetron, but not ondansetron, could bind to alpha7-nAChRs in the human brain after a single oral administration. Therefore, [11C]CHIBA-1001 may be a useful PET radioligand to measure the occupancy of alpha7-nAChRs in the human brain.

Keyword

alpha7-nicotinic acetylcholine receptor; Positron-emission tomography; Tropisetron; Ondansetron; [11C]CHIBA-1001
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