L-histidine - effect, function & importance
Histidine is a semi-essential amino acid that is synthesised in the liver. It is one of the 20 canonical amino acids. Only the enantiomer L-histidine is involved in the formation of human proteins
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Histidine is a semi-essential amino acid that is synthesised in the liver. It is one of the 20 canonical amino acids. Only the enantiomer L-histidine is involved in the formation of human proteins
What Is L-Histidine?
L-histidine is a semi-essential amino acid that can be produced in limited amounts by the body in healthy adults under normal conditions, but must be obtained through the diet in infants and children. L-histidine fulfills numerous vital functions in the human body, including the synthesis of the messenger substance histamine, the formation of hemoglobin, and an important role in the immune system and acid-base balance.
Biochemical Properties and Occurrence
L-histidine possesses a characteristic imidazole group in its side chain, which gives it special biochemical properties. This group can accept or donate protons depending on the pH value, making L-histidine an important buffer in biological systems. L-histidine is found in many protein-rich foods, including meat, particularly poultry and beef, fish and seafood, eggs, dairy products, legumes, as well as nuts and seeds.
Biological Functions
L-histidine is involved in a wide range of biologically significant processes. It is the direct precursor of histamine, an important tissue hormone and neurotransmitter that plays a central role in inflammatory reactions, allergic responses, and the regulation of gastric acid production. Furthermore, L-histidine is an essential component of hemoglobin, the oxygen-transporting protein in red blood cells. L-histidine is also a precursor of carnosine, a dipeptide found in muscle tissue that possesses antioxidant and buffering properties. In the active sites of many enzymes, L-histidine plays a key role in catalyzing biochemical reactions.
L-Histidine and the Immune System
L-histidine has a demonstrated importance for immune system function. It supports the activity of immune cells and participates in inflammatory processes. Studies show that adequate histidine levels are necessary for a normal immune response. Reduced L-histidine levels in the blood have been observed in patients with rheumatoid arthritis, suggesting a possible role of this amino acid in inflammatory conditions.
L-Histidine and Acid-Base Balance
Due to its buffering properties, L-histidine contributes to the regulation of acid-base balance in the body. In hemoglobin, L-histidine is critical for the so-called Bohr effect, in which the oxygen-binding capacity of hemoglobin is regulated depending on pH. This enables efficient oxygen delivery to tissues under acidic conditions, such as those arising during physical exertion.
Deficiency and Risk Groups
An isolated L-histidine deficiency is rare with a balanced diet. Risk groups include infants and young children, for whom L-histidine is essential, as well as individuals with severe kidney disease, chronic inflammatory conditions, or severely restricted protein intake. Possible symptoms of deficiency may include anemia, impaired immune function, and disturbances of the nervous system.
Supplementation and Safety
L-histidine is available as a dietary supplement and is discussed in connection with kidney disease, rheumatoid arthritis, and support of athletic performance, among other applications. However, the scientific evidence for these uses varies considerably. High-dose histidine preparations can increase histamine production in the body and may trigger symptoms such as headaches, nausea, or dizziness in sensitive individuals. Supplementation should therefore always be undertaken in consultation with a physician.
References
- Lehninger, A. L., Nelson, D. L., Cox, M. M. - Lehninger Principles of Biochemistry. W. H. Freeman and Company, 7th edition, 2017.
- Brosnan, J. T., Brosnan, M. E. - Histidine Metabolism and Function. Journal of Nutrition, 2020.
- European Food Safety Authority (EFSA) - Dietary Reference Values for Protein. EFSA Journal, 2012.
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