Abstract
Sulfur amino acids (SAA), particularly methionine and cysteine, are critical for the gut to maintain its functions including the digestion, absorption and metabolism of nutrients, the immune surveillance of the intestinal epithelial layer and regulation of the mucosal response to foreign antigens. However, the metabolism of SAA in the gut, specifically the transmethylation of methionine, will result in a net release of homocysteine, which is shown to be associated with cardiovascular disease and stroke. Furthermore, the extensive catabolism of dietary methionine by the intestine or by luminal microbes may result in a decrease in nutritional efficiency. Therefore, the regulation of SAA metabolism in the gut is not only nutritionally relevant, but also relevant to the overall health and well-being. The superiority of dl-2-hydroxy-4-methylthiobutyrate to dl-methionine in decreasing homocysteine production, alleviating stress responses, and reducing the first-pass intestinal metabolism of dietary methionine may provide a promising implication for nutritional strategies to manipulate SAA metabolism and thus to improve the nutrition and health status of animals and perhaps humans.
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Abbreviations
- AA:
-
Amino acids
- BCAA:
-
Branched-chain amino acids
- d-AAOX:
-
d-Amino acid oxidase
- d-HADH:
-
d-2-Hydroxy acid dehydrogenase
- dl-HMTB:
-
dl-2-Hydroxy-4-methylthiobutyrate
- dl-MET:
-
dl-Methionine
- l-HAOX:
-
l-2-Hydroxy acid oxidase
- PDV:
-
Portal drained viscera
- SAA:
-
Sulfur amino acids
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (30901042), the Program for Changjiang Scholars and Innovative Research Team in the University (IRTO555), and the Key Project of Sichuan Provincial Education Department (00924100). The authors thank graduate students, technicians, and colleagues for their important contributions to the work described in this article.
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Fang, Z., Yao, K., Zhang, X. et al. Nutrition and health relevant regulation of intestinal sulfur amino acid metabolism. Amino Acids 39, 633–640 (2010). https://doi.org/10.1007/s00726-010-0502-x
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DOI: https://doi.org/10.1007/s00726-010-0502-x