Abstract
Acetylcholine acts via nicotinic or muscarinic receptors. There are several subtypes of nicotinic receptors that are built of pentamers of at least 17 (α1–α10, β1–β4, γ, δ, ε) subunits (Wu and Lukas 2011). Several subunits of the same type may be present in any given receptor type (e.g., α1 and α5). Nicotinic receptors signal by forming ligand-regulated cation channels. There are five subtypes of muscarinic receptors (M1–M5) that act through G-protein-coupled signaling (Graef et al. 2011). Acetylcholine is synthesized by choline acetyltransferase from acetyl coenzyme A and choline. Acetylcholinesterase degrades acetylcholine to acetate and choline. Human keratinocytes synthesize, secrete, and degrade acetylcholine. Choline acetyltransferase is present in all layers of human epidermis, while acetylcholinesterase is present only in basal keratinocytes (Grando et al. 1993). The role of cholinergic system in the skin has been reviewed extensively by Grando and coworkers (2006). The role of acetylcholine-cholinergic receptor system in the skin, which among others regulates the function of eccrine glands, is well known (Fitzpatrick et al. 1993). However, the exclusive role of muscarinic system in sweat glands was challenged by finding nicotinic receptors in myoepithelial and acinar cells of those glands (Kurzen and Schallreuter 2004).
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Slominski, A.T., Zmijewski, M.A., Skobowiat, C., Zbytek, B., Slominski, R.M., Steketee, J.D. (2012). Cutaneous Cholinergic System. In: Sensing the Environment: Regulation of Local and Global Homeostasis by the Skin's Neuroendocrine System. Advances in Anatomy, Embryology and Cell Biology, vol 212. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-19683-6_4
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