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The mGlu1 antagonist CPCCOEt enhances the climbing fibre response in Purkinje neurones independently of glutamate receptors

Fukunaga, I; Yeo, CH; Batchelor, AM; (2007) The mGlu1 antagonist CPCCOEt enhances the climbing fibre response in Purkinje neurones independently of glutamate receptors. NEUROPHARMACOLOGY , 52 (2) 450 - 458. 10.1016/j.neuropharm.2006.08.014.

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Abstract

CPCCOEt(7-(hydroxyimino)cyclopropa[b]chromen-1a-carboxylate ethyl ester) is frequently used to test for the involvement of mGlu I receptors. Using whole-cell voltage recording from Purkinje cells in slices of rat cerebellum we find that CPCCOEt, at concentrations used to block mGlu1 receptors, causes an enhancement of the climbing fibre response. Application of alternative antagonists with activity at mGlu1 neither mimicked nor occluded the effects of CPCCOEt. Receptor antagonists demonstrated that this non-mGlu1 action of CPCCOEt was not mediated by other mGlu receptors or GABA(B) receptors. Voltage-clamped climbing fibre EPSCs are unaffected by CPCCOEt whilst application of a glutamate transport blocker did not occlude the CPCCOEt effect. This suggests that a postsynaptic voltage-dependent component of the complex climbing fibre response is the target. We have found no evidence for the involvement of the hyperpolarisation-activated current, I-h, and calcium-activated conductances. Voltage-gated sodium, calcium and potassium channels are possible targets with inhibition of a potassium channel the most likely. Awareness of this non-mGlu-mediated effect of CPCCOEt is likely to be important for the correct interpretation of its actions. (c) 2006 Elsevier Ltd. All rights reserved.

Type: Article
Title: The mGlu1 antagonist CPCCOEt enhances the climbing fibre response in Purkinje neurones independently of glutamate receptors
DOI: 10.1016/j.neuropharm.2006.08.014
Keywords: metabotropic glutamate receptors, cerebellum, Purkinje cell, climbing fibre, RAT CEREBELLAR SLICES, SYNAPTIC CURRENTS, IN-VITRO, CELLS, CALCIUM, CONDUCTANCE, SUBTYPES, POTENT, ACTIVATION, EXPRESSION
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Neuro, Physiology and Pharmacology
URI: http://discovery.ucl.ac.uk/id/eprint/130839
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