The five muscarinic receptor subtypes all mediate the action of acetylcholine. The odd-numbered receptors (m1, m3, and m5) couple efficiently through Gq/11 to activate phospholipase C and lead to elevation of intracellular calcium, whereas the even-numbered receptors (m2, m4) are efficiently coupled to Gi and lead to inhibition of intracellular cAMP along with several other signal transduction pathways.
Human M1 Muscarinic Receptor Membranes
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