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Histamine-Degrading Protein – Function and Relevance

A histamine-degrading protein is an enzyme that breaks down histamine in the body, preventing its accumulation and reducing symptoms of histamine intolerance.

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Things worth knowing about "Histamine-Degrading Protein"

A histamine-degrading protein is an enzyme that breaks down histamine in the body, preventing its accumulation and reducing symptoms of histamine intolerance.

What Is a Histamine-Degrading Protein?

A histamine-degrading protein is an endogenous or externally supplied enzyme responsible for breaking down and neutralizing histamine in the human body. Histamine is a biogenic amine found naturally in many foods and produced by the body itself. While it serves important physiological roles, excessive concentrations can trigger a wide range of symptoms.

The best-known histamine-degrading proteins are Diamine Oxidase (DAO) and Histamine N-Methyltransferase (HNMT). DAO is primarily active in the intestine and degrades dietary histamine, while HNMT acts mainly within cells and is particularly important in the central nervous system and liver.

Biological Function

Histamine-degrading proteins are essential for maintaining histamine balance in the body. Without sufficient enzyme activity, histamine cannot be efficiently neutralized, leading to its accumulation in tissues and the bloodstream.

Diamine Oxidase (DAO): The primary enzyme for extracellular histamine degradation in the gut. It oxidizes histamine using oxygen, converting it into imidazoleacetic acid, a harmless metabolite.
Histamine N-Methyltransferase (HNMT): This enzyme methylates and thereby inactivates histamine intracellularly. It plays a key role in the brain, lungs, and liver.

Histamine Intolerance and Enzyme Activity

Reduced activity of histamine-degrading proteins, especially DAO, is closely linked to histamine intolerance. Affected individuals are unable to adequately break down dietary histamine, resulting in characteristic symptoms.

Common Symptoms of Reduced Enzyme Activity

Headaches and migraines
Skin reactions such as flushing, itching, or hives
Gastrointestinal complaints (diarrhea, abdominal cramps, bloating)
Runny or congested nose
Heart palpitations and blood pressure changes
Fatigue and general malaise

Causes of Reduced Enzyme Activity

Genetic variants in the DAO gene
Inflammatory bowel diseases (e.g., Crohn's disease, celiac disease)
Use of certain medications (e.g., alcohol, some antibiotics, pain relievers)
Nutrient deficiencies (e.g., vitamin B6, vitamin C, and copper as DAO cofactors)

Diagnosis

The activity of histamine-degrading proteins can be assessed through various diagnostic approaches:

DAO activity blood test: A blood test measures the activity of diamine oxidase in the serum. Low values may indicate histamine intolerance.
Histamine challenge test: Under medical supervision, the body's response to a defined amount of histamine is evaluated.
Elimination diet: A low-histamine diet over several weeks can serve both diagnostic and therapeutic purposes.

Treatment and Support of Histamine Degradation

Treatment aims to support the activity of histamine-degrading proteins or reduce the histamine load on the body.

Dietary Adjustments

A low-histamine diet minimizes histamine intake from food. Foods to avoid include aged cheeses, red wine, canned fish, fermented products, and certain vegetables such as tomatoes and spinach.

DAO Enzyme Supplements

Commercially available DAO enzyme supplements, taken before meals, can support histamine degradation in the gut. These products typically contain diamine oxidase derived from porcine kidney extract or other sources.

Cofactors and Nutrients

Certain micronutrients are required for the optimal function of histamine-degrading proteins:

Vitamin B6 (pyridoxine): A key cofactor of DAO
Vitamin C: Supports histamine breakdown and promotes DAO activity
Copper: An essential cofactor of DAO

Antihistamines

In acute situations, antihistamines can be used to block the effects of excess histamine at its receptors. However, they do not replace the function of the degrading enzymes themselves.

References

Maintz L., Novak N. - Histamine and histamine intolerance. American Journal of Clinical Nutrition, 85(5):1185-1196, 2007. PubMed PMID: 17490952.
Schwelberger H.G. - Histamine intolerance: overestimated or underestimated? Inflammation Research, 58 Suppl 1:51-52, 2009.
Reese I. et al. - Dietary recommendations for adults with histamine intolerance. Allergologie Select, 5:196-210, 2021. DOI: 10.5414/ALX02268E.

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