Heterologous expression of metabotropic glutamate receptors in adult rat sympathetic neurons: subtype-specific coupling to ion channels

Neuron
S R IkedaD L Lewis

Abstract

A novel heterologous expression system was used to examine the coupling of metabotropic glutamate receptors (mGluRs) to neuronal voltage-gated ion channels. Cytoplasmic injection of mGluR2 cRNA into adult rat sympathetic neurons resulted in the expression of receptors that negatively coupled to N-type Ca2+ channels through a pertussis toxin-sensitive pathway. Injection of mGluR1 alpha cRNA resulted in the expression of receptors that inhibited M-type K+ channels via a pertussis toxin-insensitive pathway. Coupling was restricted to specific transduction elements and effectors, since mGluR2 did not inhibit M channels and mGluR1 alpha had minimal effects on Ca2+ channels. These findings demonstrate that heterologously expressed, and thus unambiguously identified, mGluR subtypes modulate specific neuronal ion channels through discrete signal transduction pathways.

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