The effects of the benzodiazepine receptor partial inverse agonist β‐carboline FG 7142 on cortical ACh efflux were determined using in vivo microdialysis in freely‐moving rats. Additionally, a within‐subjects, repeated‐dialysis experimental design (four microdialysis sessions; removable dialysis probe) was evaluated as a method for measuring changes in basal and FG 7142‐stimulated ACh efflux in the frontoparietal cortex. FG 7142 (4.0, 8.0, and 16.0 mg/kg) produced a 150–470% increase in cortical ACh efflux, with a dose‐dependent effect on the duration of the increase in efflux. Basal cortical ACh efflux was lower in session 4 than in session 1. However, the ability of FG 7142 to stimulate efflux was unchanged by repeated dialysis testing. The ability of tetrodotoxin (1.0 μM) to suppress both basal and FG 7142‐stimulated ACh efflux was also unaffected by repeated dialysis testing. These results demonstrate that systemically administered benzodiazepine receptor inverse agonists stimulate cortical ACh efflux, and that repeated‐measures experimental designs can be valid for determining certain changes in cortical ACh efflux with in vivo microdialysis. © 1995 Wiley‐Liss, Inc.
Synapse – Wiley
Published: Dec 1, 1995
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