期刊
JOURNAL OF PSYCHOPHARMACOLOGY
卷 24, 期 8, 页码 1237-1242出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0269881109349840
关键词
P-glycoprotein; venlafaxine; chronic stress; blood-brain barrier; positron emission tomography
The multi-drug efflux transporter P-glycoprotein is expressed in high concentrations at the blood-brain barrier and has a major function in the transport of drugs. In a recent PET-study evidence was found for an increased function of P-glycoprotein at the blood-brain barrier in medicated patients suffering from major depressive disorder. We used small-animal PET and [C-11]-verapamil to study P-glycoprotein function at the blood-brain barrier of rats, either being administered as venlafaxine, an antidepressant, or subjected to chronic stress, a factor contributing to the development of depression. In a first experiment, male Wistar rats underwent a three-week foot shock procedure as a model of human depression. In a second experiment, rats were chronically treated with the antidepressant venlafaxine (25 mg/kg/d via an implanted osmotic minipump). In both experiments, a [C-11]-verapamil PET scan was performed. In the chronically stressed rats, the distribution volume (V-T) of [C-11]-verapamil was significantly increased, whereas treatment with venlafaxine had the opposite effect and caused a significant reduction in V-T. The changes in V-T could not be attributed to the influx rate constant (K-1). Our data suggest that P-glycoprotein function at the blood-brain barrier is inhibited by chronic stress and increased by chronic administration of venlafaxine.
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