Stimulation of cortical acetylcholine efflux by FG 7142 measured with repeated microdialysis sampling

Stimulation of cortical acetylcholine efflux by FG 7142 measured with repeated microdialysis... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Synapse Wiley

Stimulation of cortical acetylcholine efflux by FG 7142 measured with repeated microdialysis sampling

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Publisher
Wiley
Copyright
Copyright © 1995 Wiley‐Liss, Inc.
ISSN
0887-4476
eISSN
1098-2396
DOI
10.1002/syn.890210407
pmid
8869162
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

SynapseWiley

Published: Dec 1, 1995

References

  • Dopaminergic modulation of dopamine as neonates
    Johnson, Johnson; Bruno, Bruno
  • Anxiogenic drugs beta‐CCE and FG 7142 increase extracellular dopamine levels in nucleus accumbens
    McCullough, McCullough; Salamona, Salamona

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