History
Choline was discovered by Andreas Strecker in 1864 and chemically synthesized in 1866. In 1998 choline was classified as an essential nutrient by the Food and Nutrition Board of the Institute of Medicine (U.S.A.).
Chemistry
Choline is a quaternary saturated amine with the chemical formula (CH3)3N+CH2CH2OHX, where X is a counterion such as chloride (see choline chloride), hydroxide or tartrate. Choline chloride, in mixture with urea is used as a solvent (DES) and the salicylate salt is used topically for pain relief of aphthous ulcers.
Choline hydroxide
Choline hydroxide is one of the class of phase transfer catalysts which are used to carry the hydroxide ion into organic systems, and because of this it is considered a strong base. It is the least costly phase transfer catalyst, and is used as a cheap method of stripping photoresists in circuit boards. Choline hydroxide is not completely stable and it slowly breaks down into trimethylamine.
The role of choline in humans
Physiology
Choline metabolism. (Choline is green box at left, second from the bottom.)
Choline and its metabolites are needed for three main physiological purposes: structural integrity and signaling roles for cell membranes, cholinergic neurotransmission (acetylcholine synthesis), and as a major source for methyl groups via its metabolite, trimethylglycine (betaine) that participates in the S-adenosylmethionine synthesis pathways.
Fish odor syndrome
Main article: trimethylaminuria
Choline is a precursor to trimethylamine, which some persons are not able to break down due to a genetic disorder. Persons suffering from this disorder, called trimethylaminuria, may suffer from a strong fishy or otherwise unpleasant body odor due to the body’s release of odorous trimethylamine. A body odor will occur even on a normal diet – i.e., one that is not particularly high in choline. Persons with trimethylaminuria are advised to restrict the intake of foods high in choline; this may help to reduce the sufferer’s body odor.When choline is metabolized by the body, it may form trimethylamine, a compound with a fishy odor. Hence, when large amounts of choline are taken the person may suffer from a fishy body odor.
Choline and Anxiety
Despite its importance in the central nervous system as a precursor for acetylcholine and membrane phosphatidylcholine, the role of choline in mental illness has been little studied. In a large population-based study, choline concentrations were inversely correlated with anxiety symptoms in subjects aged 4649 and 7074 years who had valid information on plasma choline concentrations and symptoms of anxiety.
Common sources of choline in the diet
The foods richest in phosphatidylcholine the major delivery form of choline are egg yolks, soy, wheat germ and cooked beef, chicken, veal and turkey livers. In 2004, the USDA released its first database of the choline content in common foods.
The most often available choline dietary supplement is lecithin, derived from soy or egg yolks, often used as a food additive. Phosphatidylcholine is also available as a supplement, in pill or powder form. Supplementary choline is also available as choline chloride, which comes as a liquid due to its hydrophilic properties. Choline chloride is sometimes preferred as a supplement because phosphatidylcholine can have gastrointestinal side effects.
The human body can make some choline, but it is generally recognized that it is important to get dietary choline as well. Although most foods have at least a little choline, some people may have to pay close attention to get enough in their diets, particularly if they do not eat many whole eggs.
Choline as a dietary supplement
It is well established that supplements of methyl group transfer vitamins B6, B12, folic acid reduce the blood titer of homocysteine and so may prevent heart disease. Choline is a necessary source of methyl groups for methyl group transfer. Supplements of lecithin/choline were found to reduce heart disease in laboratory studies.[citation needed] The reduction in heart disease with lecithin supplements may however relate more to the cholesterol carrying capacity of lecithin than to the methyl group transfer role of choline.[specify]
Choline supplements are often taken as a form of ’smart drug’ or nootropic, due to the role that the neurotransmitter acetylcholine plays in various cognition systems within the brain. Choline is a chemical precursor or “building block” needed to produce the neurotransmitter acetylcholine, and research suggests that memory, intelligence and mood are mediated at least in part by acetylcholine metabolism in the brain.[citation needed] In study on rats, a correlation was shown between choline intake during pregnancy and mental task performance of the offspring; however, the same correlation has not been shown in humans. However, this human study admits “Women in the current study consumed their usual diets. They were not eating choline-enriched diets and were not receiving choline supplementation. Therefore, our results indicate that choline concentrations in a physiologic range observed among women consuming a regular diet during pregnancy are not related to IQ in their offspring. We cannot rule out the possibility that choline supplementation could have an IQ effect.”
The compound’s quaternary amine renders it lipid insoluble which might suggest it would be unable to cross the blood-brain barrier. However, despite choline’s lipid insolubility, a choline transporter exists that allows transport across the blood-brain barrier. The efficacy of these supplements in enhancing cognitive abilities is a topic of continuing debate.
The Food and Drug Administration (FDA) requires that infant formula not made from cow’s milk be supplemented with choline.
Due to its role in lipid metabolism, choline has also found its way into nutritional supplements which claim to reduce body fat; but there is little or no evidence to prove that it has any effect on reducing excess body fat or that taking high amounts of choline will increase the rate at which fat is metabolised.
The dietary choline intake might increase the risk of colon and rectum cancer.
Pharmaceutical Uses
In addition to its role as a nutritional supplement, choline is also used in the treatment of liver disorders, Alzheimer’s disease, and bipolar depression.
Some studies show that as a supplement, choline is also used in treating hepatitis, glaucoma,, atherosclerosis, and, possible, neurological disorders..
Choline has also been proved to have a positive effect on those suffering from alcoholism.
The current NIH funded research study COBRIT is gathering data regarding potential benefit of longterm citicholine treatment for recovery after traumatic brain injury.
Additional images
Choline (C5H14NO+)
Choline chloride
Choline hydroxide
See also
Cytidine diphosphate choline
Dimethylethanolamine
References
^ Jane Higdon, “Choline”, Micronutrient Information Center, Linus Pauling Institute
^ “Choline, PDRHealth
^ “Choline” (An interview with Steven Zeisel, Editor-in-Chief of the Journal of Nutritional Biochemistry), Radio National Health Report with Norman Swan, Monday 17 April 2000
^ “” Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline (1998), Institute of Medicine.
^ Bjelland I, Tell GS, Vollset SE, Konstantinova S, Ueland PM, “Choline in anxiety and depression: the Hordaland Health Study.”, The American Journal of Clinical Nutrition.
^ “USDA Database for the Choline Content of Common Foods – 2004″, USDA Nutrient Data Laboratory
^ Hasler C.M. The Changing Face of Functional Foods. J. Am. Coll. Nutr. 19, 2000; 499S-506
^ Verhoef, Petra; Stampfer, Meir J; Buring, Julie F; Gaziano, J. Michael; Allen, Robert H; Stabler, Sally P; Reynolds, Robert D; Kok, Frans J; Hennekens, Charles H; Willett, Walter C (1996). “Homocysteine Metabolism and Risk of Myocardial Infarction: Relation with Vitamins B6, B12, and Folate”. American Journal of Epidemiology 143 (9): 845859.
^ Robert J. Sternberg, “Handbook of intelligence”, Cambridge University Press, 2000, ISBN 0521596483, 9780521596480, page 77.
^ Caroline Signore, Per Magne Ueland, James Troendle and James L Mills, “Choline concentrations in human maternal and cord blood and intelligence at 5 y of age”, American Journal of Clinical Nutrition, Vol. 87, No. 4, 896-902, April 2008 (abstract).
^ Isadora B. Stehlin, Infant Formula: Second Best but Good Enough, U.S. Food and Drug Administration.
^ Steven H. Zeisel (1981). “Dietary Choline: Biochemistry, Physiology, and Pharmacology”. Annual Review of Nutrition 1: 95121. doi:10.1146/annurev.nu.01.070181.000523.
^ Podo F. (November 1999). “Tumour phospholipid metabolism.”. NMR Biomed 12 (7): 413439. PMID 10654290.
^ Tolvanen T, Yli-Kerttula T, Ujula T, Autio A, Lehikoinen P, Minn H, Roivainen A. (January 2010). “Biodistribution and radiation dosimetry of [(11)C]choline: a comparison between rat and human data.”. Eur J Nucl Med Mol Imaging. PMID 20069295.
^ Behari J, Yeh TH, Krauland L, Otruba W, Cieply B, Hauth B, Apte U, Wu T, Evans R, Monga SP. (December 2009). “Liver-Specific {beta}-Catenin Knockout Mice Exhibit Defective Bile Acid and Cholesterol Homeostasis and Increased Susceptibility to Diet-Induced Steatohepatitis.”. Am J Pathol.. PMID 20019186.
^ Schroeder MA, Atherton HJ, Ball DR, Cole MA, Heather LC, Griffin JL, Clarke K, Radda GK, Tyler DJ. (January 2010). “The cerebrovascular role of the cholinergic neural system in Alzheimer’s disease.”. Van Beek AH, Claassen JA.. PMID 20060023.
^ Ongr D, Prescot AP, Jensen JE, Rouse ED, Cohen BM, Renshaw PF, Olson DP. (January 2010). “T2 relaxation time abnormalities in bipolar disorder and schizophrenia.”. Magn Reson Med. 63 (1): 18. PMID 19918902.
^ Chan KC, So KF, Wu EX. (January 2009). “Proton magnetic resonance spectroscopy revealed choline reduction in the visual cortex in an experimental model of chronic glaucoma.”. Exp Eye Res. 88 (1): 6570. PMID 18992243.
^ Zeisel SH, da Costa KA. (November 2009). “Choline: an essential nutrient for public health.”. Nutr Rev. 67 (11): 615623. PMID 19906248.
^ Gerald Klatskin M.D. and Willard A. Krehl Ph.D. (1954). “THE EFFECT OF ALCOHOL ON THE CHOLINE REQUIREMENT : II. INCIDENCE OF RENALNECROSIS iN WEANLING RATS FOLLOWING SHORT TERM INGESTION OF ALCOHOL”. The Journal of Experimental Medicine 100: 615627. http://jem.rupress.org/cgi/content/abstract/100/6/615.
^ Nery FG, Stanley JA, Chen HH, Hatch JP, Nicoletti MA, Serap Monkul E, Lafer B, Soares JC. (October 2009). “Bipolar disorder comorbid with alcoholism: A (1)H magnetic resonance spectroscopy study.”. J Psychiatr Res.. PMID 19818454.
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Vitamins (A11)
Fat soluble
A
Retinol -Carotene Tretinoin -Carotene
D
D2 (Ergosterol, Ergocalciferol) D3 (7-Dehydrocholesterol, Previtamin D3, Cholecalciferol, 25-hydroxycholecalciferol, Calcitriol (1,25-dihydroxycholecalciferol), Calcitroic acid)
D4 (Dihydroergocalciferol) D5 D analogues (Dihydrotachysterol, Calcipotriol, Tacalcitol, Paricalcitol)
E
Tocopherol (Alpha, Beta, Gamma, Delta) Tocotrienol Tocofersolan
K
Naphthoquinone Phylloquinone/K1 Menatetrenone/K2 Menadione/K3
Water soluble
B
B1 (Thiamine) B2 (Riboflavin) B3 (Niacin, Nicotinamide) B5 (Pantothenic acid, Dexpanthenol, Pantethine) B6 (Pyridoxine, Pyridoxal phosphate, Pyridoxamine)
B7 (Biotin) B9 (Folic acid, Dihydrofolic acid, Folinic acid) B12 (Cyanocobalamin, Hydroxocobalamin, Methylcobalamin, Cobamamide) Choline
C
Ascorbic acid Dehydroascorbic acid
see also: enzyme cofactors, enzymes, Multivitamins
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Dietary supplements
Types
Amino acids Bodybuilding supplement Energy drink Energy bar Fatty acids Herbal Supplements Minerals Prebiotics Probiotics (Lactobacillus, Bifidobacterium) Vitamins
Vitamins and minerals
Retinol (Vitamin A) B vitamins: Thiamine (B1) Riboflavin (B2) Niacin (B3) Pantothenic acid (B5) Pyridoxine (B6) Biotin (B7) Folic acid (B9) Cyanocobalamin (B12) Ascorbic acid (Vitamin C) Ergocalciferol and Cholecalciferol (Vitamin D) Tocopherol (Vitamin E) Naphthoquinone (Vitamin K) Calcium Choline Chlorine Chromium Cobalt Copper Fluorine Iodine Iron Magnesium Manganese Molybdenum Phosphorus Potassium Selenium Sodium Sulfur Zinc
Other common ingredients
AAKG Carnitine Chondroitin sulfate Cod liver oil Copper gluconate Creatine/Creatine supplements Dietary fiber Echinacea Elemental calcium Ephedra Fish oil Folic acid Ginseng Glucosamine Glutamine Grape seed extract Iron supplements Japanese Honeysuckle Krill oil Lingzhi Linseed oil Milk thistle Melatonin Red yeast rice Royal jelly Saw palmetto Spirulina St John’s wort Taurine Wheatgrass Wolfberry Yohimbine Zinc gluconate
Related articles
Codex Alimentarius Enzyte Metabolife Hadacol Nutraceutical Multivitamin Nutrition
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Nootropics
Acetylcholinesterases
Donepezil Galantamine Huperzine A (Huperzia Serrata) Ladostigil Rivastigmine Tacrine
Ampakines
CX-516 CX-546 CX-614 CX-691 CX-717 IDRA-21 LY-404,187 LY-503,430 PEPA Sunifiram Unifiram
Cholinergic Agonists
AR-R17779 Arecoline Ispronicline Nicotine PNU-282,987 SSR-180,711
D1 Agonists
6-Br-APB A-77636 Dihydrexidine Dinapsoline Doxanthrine SKF-81297
Eugeroics
Adrafinil Armodafinil Modafinil
GABAA 5 Inverse Agonists
5IA L-655,708 PWZ-029 Suritozole TB-21007 ZK-93426
H3 Antagonists
A-349,821 ABT-239 Ciproxifan GSK-189,254
Racetams
Aniracetam Brivaracetam Coluracetam Etiracetam Fasoracetam Levetiracetam Nebracetam Nefiracetam Oxiracetam Phenylpiracetam Piracetam Pramiracetam Rolziracetam Seletracetam
Others
Acetylcarnitine Adafenoxate Bifemelane Bilobalide (Ginkgo Biloba) Carbenoxolone Choline (Lecithin) Citicoline Cyprodenate Dimebolin Dimethylethanolamine Ensaculin Fipexide Idebenone Leteprinim Linopirdine Meclofenoxate Nizofenone Pirisudanol Pyritinol S-17092 Sulbutiamine Taltirelin Tricyanoaminopropene Vinpocetine
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Cholinergics
Receptor
Ligands
mAChR
Agonists: 77-LH-28-1 AC-42 AC-260,584 Aceclidine Acetylcholine AF30 AF150(S) AF267B AFDX-384 Alvameline AQRA-741 Arecoline Bethanechol Butyrylcholine Carbachol CDD-0034 CDD-0078 CDD-0097 CDD-0098 CDD-0102 Cevimeline cis-Dioxolane Ethoxysebacylcholine LY-593,039 L-689,660 LY-2,033,298 McNA343 Methacholine Milameline Muscarine NGX-267 Ocvimeline Oxotremorine PD-151,832 Pilocarpine RS86 Sabcomeline SDZ 210-086 Sebacylcholine Suberylcholine Talsaclidine Thiopilocarpine Vedaclidine VU-0029767 VU-0090157 VU-0152099 VU-0152100 VU-0238429 WAY-132,983 Xanomeline YM-796
Antagonists: 3-Quinuclidinyl Benzilate 4-DAMP Anisodamine Anisodine Atropine Atropine Methonitrate Benactyzine Benzatropine (Benztropine) Benzydamine BIBN 99 Biperiden Bornaprine CAR-226,086 CAR-301,060 CAR-302,196 CAR-302,282 CAR-302,368 CAR-302,537 CAR-302,668 CS-27349 Cyclobenzaprine Cyclopentolate Darifenacin DAU-5884 Dimethindene Dexetimide DIBD Dicyclomine (Dicycloverine) Ditran EA-3167 EA-3443 EA-3580 EA-3834 Elemicin Etanautine Etybenzatropine (Ethylbenztropine) Flavoxate Himbacine HL-031,120 Ipratropium J-104,129 Hyoscyamine Mamba Toxin 3 Mamba Toxin 7 Mazaticol Mebeverine Methoctramine Metixene Myristicin N-Ethyl-3-Piperidyl Benzilate N-Methyl-3-Piperidyl Benzilate Orphenadrine Otenzepad Oxybutynin PBID PD-102,807 Phenglutarimide Phenyltoloxamine Pirenzepine Piroheptine Procyclidine Profenamine RU-47,213 SCH-57,790 SCH-72,788 SCH-217,443 Scopolamine (Hyoscine) Solifenacin Telenzepine Tiotropium Tolterodine Trihexyphenidyl Tripitamine Tropatepine Tropicamide WIN-2299 Zamifenacin; Others: 1st Generation Antihistamines (Brompheniramine Chlorpheniramine, Cyclizine, Cyproheptadine, Dimenhydrinate, Diphenhydramine, Doxylamine, Hydroxyzine, Meclizine, Mepyramine/Pyrilamine, Phenindamine, Pheniramine, Tripelennamine, Triprolidine, etc) Tricyclic Antidepressants (Amitriptyline, Doxepin, Trimipramine, etc) Tetracyclic Antidepressants (Amoxapine, Maprotiline, etc) Typical Antipsychotics (Chlorpromazine, Thioridazine, etc) Atypical Antipsychotics (Clozapine, Olanzapine, Quetiapine, etc)
nAChR
Agonists: 5-HIAA A-84,543 A-366,833 A-582,941 A-867,744 ABT-202 ABT-418 ABT-560 ABT-894 Acetylcholine Altinicline Anabasine AR-R17779 Butyrylcholine Carbachol Cotinine Cytisine Decamethonium Desformylflustrabromine Dianicline Dimethylphenylpiperazinium Epibatidine Epiboxidine Ethoxysebacylcholine EVP-4473 EVP-6124 Galantamine GTS-21 Ispronicline Lobeline MEM-63,908 (RG-3487) Nicotine NS-1738 PHA-543,613 PHA-709,829 PNU-120,596 PNU-282,987 Pozanicline Rivanicline Sazetidine A Sebacylcholine SIB-1508Y SIB-1553A SSR-180,711 Suberylcholine TC-1698 TC-1734 TC-1827 TC-2216 TC-5214 TC-5619 TC-6683 Tebanicline Tropisetron UB-165 Varenicline XY-4083
Antagonists: 18-Methoxycoronaridine -Bungarotoxin -Conotoxin Alcuronium Anatruxonium Atracurium Bupropion (Amfebutamone) Chandonium Chlorisondamine Cisatracurium Coclaurine Coronaridine Dacuronium Decamethonium Dextromethorphan Dextropropoxyphene Dextrorphan Diadonium DHE Dimethyltubocurarine (Metocurine) Dipyrandium Dizocilpine (MK-801) Doxacurium Duador Esketamine Fazadinium Gallamine Hexafluronium Hexamethonium (Benzohexonium) Ibogaine Ketamine Kynurenic Acid Levacetylmethadol Malouetine Mecamylamine Memantine Methadone Methorphan (Racemethorphan) Methyllycaconitine Metocurine Mivacurium Morphanol (Racemorphanol) Neramexane Pancuronium Pempidine Pentamine Pentolinium Phencyclidine Pipecuronium Radafaxine Rapacuronium Rocuronium Surugatoxin Suxamethonium (Succinylcholine) Toxiferine Trimethaphan Tropeinium Tubocurarine Vecuronium
Reuptake
Inhibitors
Plasmalemmal
CHT Inhibitors
Hemicholinium-3 (Hemicholine)
Vesicular
VAChT Inhibitors
Vesamicol
Enzyme
Inhibitors
Anabolism
ChAT Inhibitors
1-(-Benzoylethyl)pyridinium 2-(-Naphthoyl)ethyltrimethylammonium 3-Chloro-4-stillbazole 4-(1-Naphthylvinyl)pyridine Acetylseco Hemicholinium-3 Acryloylcholine AF64A B115 BETA CM-54,903 N,N-Dimethylaminoethylacrylate N,N-Dimethylaminoethylchloroacetate
Catabolism
AChE Inhibitors
Reversible: Carbamates: Aldicarb Bendiocarb Bufencarb Carbaryl Carbendazim Carbetamide Carbofuran Chlorbufam Chloropropham Ethienocarb Ethiofencarb Fenobucarb Fenoxycarb Formetanate Furadan Ladostigil Methiocarb Methomyl Miotine Oxamyl Phenmedipham Pinmicarb Pirimicarb Propamocarb Propham Propoxur; Stigmines: Ganstigmine Neostigmine Phenserine Physostigmine Pyridostigmine Rivastigmine; Others: Ambenonium Donepezil Edrophonium Galantamine Huperzine A (Huperzia Serrata) Minaprine Tacrine Zanapezil
Irreversible: Organophosphates: Acephate Azinphos-Methyl Bensulide Cadusafos Chlorethoxyfos Chlorfenvinphos Chlorpyrifos Chlorpyrifos-Methyl Coumaphos Cyclosarin (GF) Demeton Demeton-S-Methyl Diazinon Dichlorvos Dicrotophos Diisopropyl Fluorophosphate (Guthion) Diisopropylphosphate Dimethoate Dioxathion Disulfoton EA-3148 Echothiophate Ethion Ethoprop Fenamiphos Fenitrothion Fenthion Fosthiazate GV Isofluorophate Isoxathion Malaoxon Malathion Methamidophos Methidathion Metrifonate Mevinphos Monocrotophos Naled Novichok Agent Omethoate Oxydemeton-Methyl Paraoxon Parathion Parathion-Methyl Phorate Phosalone Phosmet Phostebupirim Phoxim Pirimiphos-Methyl Sarin (GB) Soman (GD) Tabun (GA) Temefos Terbufos Tetrachlorvinphos Tribufos Trichlorfon VE VG VM VR VX; Others: Demecarium Onchidal (Onchidella Binneyi)
BChE Inhibitors
Many of the acetylcholinesterase inhibitors listed above act as butyrylcholinesterase inhibitors.
Others
Precursors
Choline (Lecithin) Citicoline Dimethylethanolamine Glycerophosphocholine Phosphatidylcholine Phosphatidylethanolamine Phosphorylcholine
Cofactors
Acetic Acid Acetyl-L-Carnitine Acetyl-Coenzyme A Vitamin B5 (Pantothenic Acid, Pantethine, Pantetheine, Panthenol)
Others
Acetylcholine Releasing Agents: -Latrotoxin -Bungarotoxin; Acetylcholine Release Inhibitors: Botulinum Toxin (Botox); Acetylcholinesterase Reactivators: Pralidoxime obidoxime
External links
Choline
Categories: Alcohols | Quaternary ammonium compounds | Dietary supplements | Nutrition | VitaminsHidden categories: Articles with unsourced statements from November 2008 | All articles with unsourced statements | Articles with unsourced statements from September 2009 | Articles needing more detailed references
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