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Nicotinic acetylcholine receptors, or nAChRs, are receptor polypeptides that respond to the neurotransmitter acetylcholine. Nicotinic receptors also respond to drugs such as the agonist nicotine . They are found in the central and peripheral nervous system, muscle, and many other tissues of many organisms.
The alpha-3 beta-4 nicotinic receptor, also known as the α3β4 receptor and the ganglion-type nicotinic receptor, [1] is a type of nicotinic acetylcholine receptor, consisting of α3 and β4 subunits.
The alpha-3 beta-2 nicotinic receptor, also known as the α3β2 receptor, is a type of nicotinic acetylcholine receptor, consisting of α3 and β2 subunits. It occurs alongside the more common α3β4 nicotinic receptor in autonomic ganglia , and as an facilitatory presynaptic autoreceptor at the neuromuscular junction (NMJ).
The alpha-4 beta-2 nicotinic receptor, also known as the α4β2 receptor, is a type of nicotinic acetylcholine receptor implicated in learning, [1] consisting of α4 and β2 subunits. [2] It is located in the brain , where activation yields post- and presynaptic excitation , [ 2 ] mainly by increased Na + and K + permeability.
The alpha-7 nicotinic receptor, also known as the α7 receptor, is a type of nicotinic acetylcholine receptor implicated in long-term memory, consisting entirely of α7 subunits. [1] As with other nicotinic acetylcholine receptors, functional α7 receptors are pentameric [i.e., (α7) 5 stoichiometry ].
A nicotinic agonist is a drug that mimics the action of acetylcholine (ACh) at nicotinic acetylcholine receptors (nAChRs). The nAChR is named for its affinity for nicotine. Examples include nicotine (by definition), acetylcholine (the endogenous agonist of nAChRs), choline, epibatidine, lobeline, varenicline and cytisine. [1]
Nicotinic receptors cause the release of catecholamine from the adrenal medulla, and also site specific excitation or inhibition in brain. Both Nm and Nn receptor types are non-selective cation channels, permeable to sodium and potassium ions, in addition to that, Nn type receptors allow for calcium ion flow.
The muscle-type nicotinic receptor is a type of nicotinic acetylcholine receptor consisting of the subunit combination (α1) 2 β1δε (adult receptor) or (α1) 2 β1δγ (fetal receptor). [1] These receptors are found in neuromuscular junctions, where activation leads to an excitatory postsynaptic potential (EPSP), mainly by increased Na + and ...