Acetylcholine receptor

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Acetylcholine receptors function throughout the nervous system including the parasympathetic nervous system and are "cell surface proteins that bind acetylcholine with high affinity and trigger intracellular changes influencing the behavior of cells. Cholinergic receptors are divided into two major classes, muscarinic and nicotinic, based originally on their affinity for nicotine and muscarine. Each group is further subdivided based on pharmacology, location, mode of action, and/or molecular biology."[1]

## Contents

* 1 Classification
* 1.1 Muscarinic receptors
* 1.1.1 M1 receptor
* 1.1.2 M2 receptor
* 1.1.3 M3 receptor
* 1.1.4 M4 receptor
* 1.1.5 M5 receptor
* 1.2 Nicotinic receptors
* 1.2.1 N1 receptor
* 1.2.2 N2 receptor
* 2 See also
* 3 References

## Classification[edit]

Acetylcholine receptors are divided into muscarinic and nicotinic receptors.[2]

### Muscarinic receptors[edit]

There are five types of muscarinic receptors.[3][4]

#### M1 receptor[edit]

The M1 receptor is in the peripheral ganglia.[5]

#### M2 receptor[edit]

The M2 receptor is a "specific subtype of muscarinic receptor found in the lower brain, the heart and in smooth muscle-containing organs. although present in smooth muscle the m2 muscarinic receptor appears not to be involved in contractile responses."[6]

#### M3 receptor[edit]

The M3 receptor is found in smooth muscle-containing organs.[7]

#### M4 receptor[edit]

The M4 receptor is a "specific subtype of muscarinic receptor found in the corpus striatum and the lung. it has similar receptor binding specificities to muscarinic receptor m1 and muscarinic receptor m2."[8]

#### M5 receptor[edit]

The M5 receptor is a "specific subtype of muscarinic receptor found in a variety of locations including the salivary glands and the substantia nigra and ventral tegmental area of the brain."[9]

### Nicotinic receptors[edit]

Some authors subdivide nicotinic receptors into N1 and N2 receptors.[10]

#### N1 receptor[edit]

N1 receptors are in the neuromuscular junction.[11] These are susceptible to snake α-toxins.

Antibodies to the N1 receptor is the most common cause of myasthemia gravis.[12]

#### N2 receptor[edit]

N2 receptors in ganglia.[11] These are resistant to snake α-toxins.

## See also[edit]

* Acetylcholine
* Parasympathetic nervous system
* Adrenergic receptor

## References[edit]

1. ↑ Anonymous. Acetylcholine receptors. National Library of Medicine. Retrieved on 2008-01-21.
2. ↑ Agranoff, Bernard W.; Siegel, George J. (1999). “Organization of the Cholinergic Nervous System”, Basic neurochemistry: molecular, cellular, and medical aspects. Philadelphia: Lippincott-Raven. ISBN 0-397-51820-X.
3. ↑ Agranoff, Bernard W.; Siegel, George J. (1999). “Muscarinic Receptors”, Basic neurochemistry: molecular, cellular, and medical aspects. Philadelphia: Lippincott-Raven. ISBN 0-397-51820-X.
4. ↑ Hulme EC, Birdsall NJ, Buckley NJ (1990). "Muscarinic receptor subtypes". Annu. Rev. Pharmacol. Toxicol. 30: 633–73. DOI:10.1146/annurev.pa.30.040190.003221. PMID 2188581. Research Blogging.
5. ↑ Anoymous. Receptor, Muscarinic M1. National Library of Medicine. Retrieved on 2008-01-21.
6. ↑ Anoymous. Receptor, Muscarinic M2. National Library of Medicine. Retrieved on 2008-01-21.
7. ↑ Anoymous. Receptor, Muscarinic M3. National Library of Medicine. Retrieved on 2008-01-21.
8. ↑ Anoymous. Receptor, Muscarinic M4. National Library of Medicine. Retrieved on 2008-01-21.
9. ↑ Anoymous. Receptor, Muscarinic M5. National Library of Medicine. Retrieved on 2008-01-21.
10. ↑ Agranoff, Bernard W.; Siegel, George J. (1999). “Organization of the Cholinergic Nervous System”, Basic neurochemistry: molecular, cellular, and medical aspects. Philadelphia: Lippincott-Raven. ISBN 0-397-51820-X.
11. ↑ 11.0 11.1 Agranoff, Bernard W.; Siegel, George J. (1999). “Nicotinic Receptors”, Basic neurochemistry: molecular, cellular, and medical aspects. Philadelphia: Lippincott-Raven. ISBN 0-397-51820-X.
12. ↑ Lindstrom J (2002). "Autoimmune diseases involving nicotinic receptors". J. Neurobiol. 53 (4): 656–65. DOI:10.1002/neu.10106. PMID 12436428. Research Blogging.