PubMed: 21787755

Title
Naturally-expressed nicotinic acetylcholine receptor subtypes.
Journal
Biochemical pharmacology
Volume
82
Issue
None
Pages
800-7
Date
2011-10-15
Authors
Lukas RJ | Wu J

Evidence 54ea7e2e95

In terms of functional effects, nicotine acts acutely much in the way that ACh does, causing opening of nAChR channels.

Evidence e5ee135575

There is an emerging consensus that nAChR a6 subunit mRNA and proteins are distributed in brain regions thought to be involved in reward and drug reinforcement, in theory being involved in DA release [135].

Evidence fbee33a219

Also, Endo et al. [141] found naturally-expressed a3b2- and a6b2-nAChRs on superior colli- culus neurons, and these receptors are likely located on pre- synaptic terminals of GABAergic neurons where they modulate GABA release.

Evidence 39964b4596

b4 subunit mRNA colocalizes with a4 subunit mRNA in many brain regions [37,38] that could be involved in complex behaviors including nicotine dependence.

Evidence 3537e3110d

a6 subunits are not widely expressed in the brain, but they are prevalent in midbrain dopaminergic (DAergic) regions associated with pleasure, reward, and mood control

Evidence 826dc47cfb

Recently, we reported a novel discovery that functional a6*-nAChRs are located on GABAergic presynaptic boutons associated with VTA DAergic neurons, where these a6*- nAChRs mediate nicotinic modulation of GABA release onto those DAergic neurons [122].

Evidence 6e9e656f05

This makes the hypothesis particularly intriguing that a6*-nAChRs play roles in nicotine dependence.

Evidence ea808654f7

There is good evidence that a6*-nAChRs, in particular, modulate neurotransmitter release in multiple brain regions.

Evidence c3f277cf68

Subsequently, renewed searches for functions of natural Bgt-binding nAChRs uncovered short-lived, nicotine-gated, toxin-sensitive, inward currents and/ or elevations of intracellular Ca2+ in chick autonomic neurons [84], in human ganglionic neuron-like clonal cells [85], or in rat CNS neurons [16,40–44,86–91].

Evidence bbcb9f8975

By virtue of their unique subcellular localizations, channel kinetics and Ca2+ permeability, a7-nAChRs appear to have novel functional roles in addition to (i.e., distinct from) the mediation of classical excitatory neurotransmission.

Evidence a672e60eeb

For example, Bgt-sensitive a7-nAChRs have been implicated in processes such as vicinal control of neurotransmitter release [7,14], development and maintenance of neurites and synapses [18–20], long-term potentiation [95,96], seizures [97], and neuronal viability/death [21–24]. These intriguing findings underscore the need for further characterization of functional a7-nAChRs.

Evidence be8148b38d

Other ‘‘a3b2-specific’’ antagonists, such as neuronal- or kappa- bungarotoxin and a-CtxPnIA, have also turned out to block a6*- nAChRs [129].

Evidence 7c0edf2bba

a4b2-nAChRs have been implicated in nicotine self-administration, reward, and depen- dence, and in diseases such as Alzheimer’s and epilepsy [1–5,27–33].

Evidence 763df70b50

Initially, a-CtxMII was thought to be highly selective for a3b2*-nAChRs [124] and became a useful tool for investigating receptor structure [125].

Evidence 2ec3c2afb1

Moreover, some nAChRs have been implicated in processes such as the structuring and maintenance of neurites and synapses [18–20] and even in modulation of neuronal viability/death [21–24].

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