|Metabolism||CYP2D6, FMO3, MAO-A, MAO-B, PNMT, DBH, others|
|Metabolites||4-hydroxyphenylacetaldehyde, dopamine, N-methyltyramine, octopamine|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||137.179 g·mol−1|
|3D model (JSmol)|
|Melting point||164.5 °C (328.1 °F) |
|Boiling point||206 °C (403 °F) at 25 mmHg; 166 °C at 2 mmHg|
Tyramine (// TY-rə-meen) (also spelled tyramin), also known under several other names,[note 1] is a naturally occurring trace amine derived from the amino acid tyrosine. Tyramine acts as a catecholamine releasing agent. Notably, it is unable to cross the blood-brain barrier, resulting in only non-psychoactive peripheral sympathomimetic effects following ingestion. A hypertensive crisis can result, however, from ingestion of tyramine-rich foods in conjunction with the use of monoamine oxidase inhibitors (MAOIs).
Tyramine occurs widely in plants and animals, and is metabolized by various enzymes, including monoamine oxidases. In foods, it often is produced by the decarboxylation of tyrosine during fermentation or decay. Foods that are fermented, cured, pickled, aged, or spoiled have high amounts of tyramine. Tyramine levels go up when foods are at room temperature or go past their freshness date.
- strong or aged cheeses: cheddar, Swiss, Parmesan; Stilton, Gorgonzola or blue cheeses; Camembert, feta, Muenster. Cheeses made from pasteurized milk are lower in tyramine: American, ricotta, cottage, farmer's, and cream cheese. Other dairy products are also lower in tyramine: yogurt, fresh milk, sour cream, soy cheese, soy milk, Havarti cheese, Brie.
- meats that are cured, smoked, or processed, such as salami, pepperoni, dry sausages, hot dogs, bologna, bacon, corned beef, pickled or smoked fish, caviar, aged chicken livers, soups or gravies made from meat extract. Some meat products are lower in tyramine: fresh or frozen meat, poultry, and fish; eggs; canned meats or fish freshly opened; luncheon meats except salami.
- pickled or fermented foods: sauerkraut, kimchi, tofu (especially stinky tofu), pickles, miso soup, bean curd, tempeh
- condiments: soy, shrimp, fish, miso, teriyaki, and bouillon-based sauces. Lower in tyramine: ketchup, mustard, Worcestershire sauce, salad dressing; vegemite, Pro-mite, marmite
- drinks: beer (especially tap or home-brewed), vermouth, red wine, sherry, liqueurs. Lower in tyramine: decaffeinated coffee, tea or soda; club soda; fresh or soy milk; bourbon; gin; rum; vodka
- beans, vegetables, and fruits: soybeans and soybean products, snow peas, broad (fava) beans and their pods; raw onions; oranges, grapefruit, lemons, limes, tangerines, pineapple. Lower in tyramine: most fresh, canned or frozen vegetables; raisins. Raspberries and avocados have moderate levels.
Most breads (except sourdough), pasta, grains, sweets, and desserts are low in tyramine.
Physical effects and pharmacology
Evidence for the presence of tyramine in the human brain has been confirmed by postmortem analysis. Additionally, the possibility that tyramine acts directly as a neuromodulator was revealed by the discovery of a G protein-coupled receptor with high affinity for tyramine, called TAAR1. The TAAR1 receptor is found in the brain, as well as peripheral tissues, including the kidneys. Tyramine binds to both TAAR1 and TAAR2 as an agonist in humans.
Tyramine is physiologically metabolized by monoamine oxidases (primarily MAO-A), FMO3, PNMT, DBH, and CYP2D6. Human monoamine oxidase enzymes metabolize tyramine into 4-hydroxyphenylacetaldehyde. If monoamine metabolism is compromised by the use of monoamine oxidase inhibitors (MAOIs) and foods high in tyramine are ingested, a hypertensive crisis can result, as tyramine also can displace stored monoamines, such as dopamine, norepinephrine, and epinephrine, from pre-synaptic vesicles. Tyramine is considered a "false neurotransmitter", as it enters noradrenergic nerve terminals and displaces large amounts of norepinephrine, which enters the blood stream and causes vasoconstriction.
The first signs of this effect were discovered by a British pharmacist who noticed that his wife, who at the time was on MAOI medication, had severe headaches when eating cheese. For this reason, it is still called the "cheese effect" or "cheese crisis," although other foods can cause the same problem.:30–31
A large dietary intake of tyramine (or a dietary intake of tyramine while taking MAO inhibitors) can cause the tyramine pressor response, which is defined as an increase in systolic blood pressure of 30 mmHg or more. The increased release of norepinephrine (noradrenaline) from neuronal cytosol or storage vesicles is thought to cause the vasoconstriction and increased heart rate and blood pressure of the pressor response. In severe cases, adrenergic crisis can occur.[medical citation needed] Although the mechanism is unclear, tyramine ingestion also triggers migraine attacks in sensitive individuals. Vasodilation, dopamine, and circulatory factors are all implicated in the migraines. Double-blind trials suggest that the effects of tyramine on migraine may be adrenergic.
Research reveals a possible link between migraines and elevated levels of tyramine. A 2007 review published in Neurological Sciences presented data showing migraine and cluster diseases are characterized by an increase of circulating neurotransmitters and neuromodulators (including tyramine, octopamine, and synephrine) in the hypothalamus, amygdala, and dopaminergic system. People with migraine are over-represented among those with inadequate natural monoamine oxidase, resulting in similar problems to individuals taking MAO inhibitors. Many migraine attack triggers are high in tyramine.
If one has had repeated exposure to tyramine, however, there is a decreased pressor response; tyramine is degraded to octopamine, which is subsequently packaged in synaptic vesicles with norepinephrine (noradrenaline). Therefore, after repeated tyramine exposure, these vesicles contain an increased amount of octopamine and a relatively reduced amount of norepinephrine. When these vesicles are secreted upon tyramine ingestion, there is a decreased pressor response, as less norepinephrine is secreted into the synapse, and octopamine does not activate alpha or beta adrenergic receptors.[medical citation needed]
When using a MAO inhibitor (MAOI), an intake of approximately 10 to 25 mg of tyramine is required for a severe reaction, compared to 6 to 10 mg for a mild reaction.
Biochemically, tyramine is produced by the decarboxylation of tyrosine via the action of the enzyme tyrosine decarboxylase. Tyramine can, in turn, be converted to methylated alkaloid derivatives N-methyltyramine, N,N-dimethyltyramine (hordenine), and N,N,N-trimethyltyramine (candicine).
In humans, tyramine is produced from tyrosine, as shown in the following diagram.
Status in Florida
Tyramine is a Schedule I controlled substance, categorized as a hallucinogen, making it illegal to buy, sell, or possess in the state of Florida without a license at any purity level or any form whatsoever. The language in the Florida statute says tyramine is illegal in "any material, compound, mixture, or preparation that contains any quantity of [tyramine] or that contains any of [its] salts, isomers, including optical, positional, or geometric isomers, and salts of isomers, if the existence of such salts, isomers, and salts of isomers is possible within the specific chemical designation."
This ban is likely the product of lawmakers overly eager to ban substituted phenethylamines, which tyramine is, in the mistaken belief that ring-substituted phenethylamines are hallucinogenic drugs like the 2C series of psychedelic substituted phenethylamines. The further banning of tyramine's optical isomers, positional isomers, or geometric isomers, and salts of isomers where they exist, means that meta-tyramine and phenylethanolamine, a substance found in every living human body, and other common, non-hallucinogenic substances are also illegal to buy, sell, or possess in Florida. Given that tyramine occurs naturally in many foods and drinks (most commonly as a by-product of bacterial fermentation), e.g. wine, cheese, and chocolate, Florida's total ban on the substance may prove difficult to enforce.
- Synonyms and alternative names include: 4-hydroxyphenethylamine, para-tyramine, mydrial, and uteramin; the latter two names are not commonly used. The IUPAC name is 4-(2-aminoethyl)phenol.
- The Merck Index, 10th Ed. (1983), p. 1405, Rahway: Merck & Co.
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Table 5: N-containing drugs and xenobiotics oxygenated by FMO
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- §1308.11 Schedule I
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