metabotropic receptor
G-protein coupled receptor that activates intracellular signaling cascades upon neurotransmitter binding.
Full Definition
Metabotropic receptors are a class of neurotransmitter receptors that operate through G-protein coupled mechanisms to activate intracellular signaling cascades. Unlike ionotropic receptors that directly gate ion channels, metabotropic receptors modulate cellular function through second messenger systems such as cAMP, IP3, and DAG. These receptors typically produce slower, longer-lasting effects compared to ionotropic receptors and can modulate ion channels, enzyme activity, and gene expression. Examples include metabotropic glutamate receptors (mGluRs), muscarinic acetylcholine receptors, and many monoamine receptors. Metabotropic signaling is crucial for synaptic plasticity, neuromodulation, and the therapeutic effects of many psychiatric medications.
Usage
Usage note: Contrast with ionotropic receptors in terms of mechanism and time course.
In Context
- "The metabotropic glutamate receptor mediated the slow synaptic response." — Pharmacological study
- "Activation of metabotropic receptors triggered a cascade of intracellular signaling events." — Signal transduction research