β-alanine is a breakdown product of carnosine and anserine, which are dipeptides from meat consumption. Although β-alanine’s properties are limited, its relationship to carnosine makes it important. Both have antioxidant properties. And, as previously mentioned, carnosine is critical for pH buffering in skeletal muscle during exercise, but its formation can be limited by enzymatic factors.
For this reason, supplementation with β-alanine is sometimes used to enhance carnitine and therefore improve athletic performance. In addition to diet and supplementation, β-alanine can also be endogenously produced. This occurs via degradation of uracil in the liver but it can also be made by intestinal bacteria such as E. coli.
Since β-alanine comes from meat consumption, endogenous production is the only source in vegetarian and vegan populations. Given their limited diets, vegetarians and vegans have lower levels of β-alanine and muscle carnosine compared to omnivores. There is also an interesting interplay between taurine and β-alanine. Taurine and β-alanine share the same skeletal muscle transporter, whereby β-alanine can inhibit taurine’s uptake into muscle. Elevated beta-alanine can sometimes deplete taurine leading to oxidative stress, causing tissue damage. Additionally, these two amino acids compete for the same reabsorption transporters in the kidney. Elevated β-alanine can contribute to renal wasting of taurine.
References:
- Trexler ET, Smith-Ryan AE, Stout JR, et al. International society of sports nutrition position stand: Beta-Alanine. J Int Soc Sports Nutr. 2015;12:30.
- Eaton K, Howard M, Mphil AH. Urinary beta-alanine excretion is a marker of abnormal as well as normal gut fermentation. J Nutr Med. 1994;4(2):157-163.
- Trexler ET, Smith-Ryan AE, Stout JR, et al. International society of sports nutrition position stand: Beta-Alanine. J Int Soc Sports Nutr. 2015;12:30-30.
- Shetewy A, Shimada-Takaura K, Warner D, et al. Mitochondrial defects associated with beta-alanine toxicity: relevance to hyper-beta-alaninemia. Molec Cell Biochem. 2016;416(1-2):11-22.
- Jong CJ, Azuma J, Schaffer S. Mechanism underlying the antioxidant activity of taurine: prevention of mitochondrial oxidant production. Amino Acids. 2012;42(6):2223-2232.
- Chesney RW, Han X, Patters AB. Taurine and the renal system. J Sci. 2010;17 Suppl 1(Suppl 1):S4-S4.
- Suidasari S, Stautemas J, Uragami S, Yanaka N, Derave W, Kato N. Carnosine Content in Skeletal Muscle Is Dependent on Vitamin B6 Status in Rats. Front Nutr. 2015;2:39.
- Hahn CD, Shemie SD, Donner EJ. Status Epilepticus. In: Ped Critic Care. Elsevier; 2011:837-848.
- Parviz M, Vogel K, Gibson KM, Pearl PL. Disorders of GABA metabolism: SSADH and GABA-transaminase deficiencies. J Ped Epilepsy. 2014;3(4):217-227.
- Blancquaert L, Baba SP, Kwiatkowski S, et al. Carnosine and anserine homeostasis in skeletal muscle and heart is controlled by beta-alanine transamination. J Physiol. 2016;594(17):4849-4863.
- Perim P, Marticorena FM, Ribeiro F, et al. Can the Skeletal Muscle Carnosine Response to Beta-Alanine Supplementation Be Optimized? Front Nutr. 2019;6:135.
- Peters V, Klessens CQ, Baelde HJ, et al. Intrinsic carnosine metabolism in the human kidney. Amino Acids. 2015;47(12):2541-2550.
- Eaton K, Howard M, Mphil AH. Urinary beta-alanine excretion is a marker of abnormal as well as normal gut fermentation. J Nutr Med. 1994;4(2):157-163.
beta-Alanine
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