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Histamine Tolerance Kinetic Markers - Overview

Histamine tolerance kinetic markers are biochemical parameters that describe how the body breaks down and tolerates histamine. They are key tools in diagnosing histamine intolerance.

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Histamine tolerance kinetic markers are biochemical parameters that describe how the body breaks down and tolerates histamine. They are key tools in diagnosing histamine intolerance.

What Are Histamine Tolerance Kinetic Markers?

Histamine tolerance kinetic markers are biochemical parameters that provide insight into how quickly and efficiently the human body metabolizes histamine. Histamine is a biogenic amine that occurs naturally in the body and is also ingested through food. When histamine metabolism is impaired, histamine can accumulate in the blood -- a condition known as histamine intolerance.

Biological Basis of Histamine Kinetics

Histamine is primarily broken down by two enzymes:

Diamine oxidase (DAO): The primary enzyme responsible for extracellular histamine degradation in the gut. DAO deficiency is the most common underlying cause of histamine intolerance.
Histamine N-methyltransferase (HNMT): This enzyme degrades histamine intracellularly, mainly in the liver and kidneys.

The activity of these enzymes, as well as histamine concentrations in blood and plasma, constitute the key histamine tolerance kinetic markers.

Key Markers at a Glance

Diamine Oxidase (DAO) Activity

Measurement of DAO activity in the blood is the most important marker. Low DAO levels indicate a reduced capacity to degrade dietary histamine in the intestine. Reference values vary by laboratory, but values below 3 HDU/ml (histamine degradation units per milliliter) are generally considered abnormal.

Plasma Histamine Concentration

Elevated plasma histamine levels (above 1 ng/ml in a fasting state) may indicate insufficient degradation capacity. However, this value is strongly dependent on food intake and should always be interpreted in conjunction with DAO activity.

HNMT Activity and Genotyping

Polymorphisms in the HNMT gene (e.g., the T939C variant) can lead to reduced enzyme activity. Genetic analysis complements biochemical diagnostics and provides evidence of a constitutional predisposition to histamine intolerance.

Additional Biomarkers

Urinary methylhistamine: A metabolite of the HNMT degradation pathway that reflects histamine exposure over a longer period.
Tryptase: A marker used to differentiate mast cell-mediated reactions (e.g., mastocytosis or allergic reactions) from true histamine intolerance.
IgE antibodies: Used to rule out IgE-mediated food allergy as a differential diagnosis.

Diagnosis and Clinical Relevance

Histamine tolerance kinetic markers are determined through a blood draw, ideally in a fasting state and without recent use of antihistamines or DAO-inhibiting substances (e.g., certain pain medications or alcohol). The markers must be interpreted in clinical context, as a low DAO value alone is not sufficient for diagnosis. The diagnosis of histamine intolerance is based on:

Symptom diary and dietary history
Laboratory findings (DAO activity, plasma histamine level)
Response to a low-histamine diet
Exclusion of other conditions (mast cell disorders, allergies)

Factors Influencing Histamine Kinetics

Several factors can affect histamine tolerance kinetics and alter test results:

Diet: Histamine-rich foods (aged cheeses, red wine, canned fish) increase the histamine load.
Medications: Certain antibiotics, pain relievers (e.g., acetylsalicylic acid), and antidepressants inhibit DAO or HNMT.
Gut health: Conditions such as Crohn's disease, celiac disease, or dysbiosis can reduce DAO production in the intestine.
Pregnancy: DAO activity increases during pregnancy, which is why histamine intolerance symptoms often improve in pregnant women.
Genetic factors: Polymorphisms in the genes for DAO (AOC1) and HNMT influence individual metabolic capacity.

Treatment in Cases of Altered Histamine Tolerance Kinetic Markers

When markers indicate impaired histamine kinetics, treatment typically involves several approaches:

Low-histamine diet: Reducing foods that are rich in histamine or that trigger histamine release.
DAO supplements: Taking DAO-containing dietary supplements before meals to support histamine degradation.
Antihistamines: H1 and H2 blockers to relieve acute symptoms.
Cofactor supplementation: Vitamin B6, vitamin C, and copper are important cofactors for DAO activity and may be supplemented when deficient.
Treatment of underlying conditions: In secondary histamine intolerance (e.g., due to celiac disease or inflammatory bowel disease), treating the root cause is the primary goal.

References

Maintz L, Novak N. Histamine and histamine intolerance. American Journal of Clinical Nutrition. 2007;85(5):1185-1196.
Schnedl WJ, Lackner S, Enko D, et al. Evaluation of symptoms and symptom combinations in histamine intolerance. Intestinal Research. 2019;17(3):427-433.
Reese I, et al. Guideline of the German Society for Allergology and Clinical Immunology (DGAKI): Approach to suspected intolerance to orally ingested histamine. Allergo Journal International. 2017;26(2):72-79.

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