Abstract
Daily intraperitoneal administration to rats of 5 mg/kg of chlorpromazine (CPZ) for 21 days induced a significant up-regulation (51%) of peripheral benzodiazepine binding sites (PBSs) in cerebral cortex and a down-regulation of PBSs in the heart (25%) and kidney (14%), whereas no alteration in [3H]flunitrazepam binding in cerebral cortex was observed. [3H]PK 11195 binding to cerebral cortex returned to normal following 5 days of CPZ withdrawal, whereas the density of PBSs in the heart and kidney remained reduced. The affinity of PBSs for the ligand [3H]PK 11195 in the cerebral cortex and heart was not affected by the drug treatment or withdrawal. The CPZ-induced alterations in PBSs may be relevant to the effects of the drug on CNS and/or peripheral organs.
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