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Sarcosine is an intermediate in the biosynthesis of glycine from choline.1 It is a selective inhibitor of glycine transporter 1 (GlyT1) with IC50 values of 91 and greater than 1,000 µM for GlyT1 and GlyT2, respectively, in HEK293 cells expressing the human transporters.2 Sarcosine levels are increased in prostate cancer cell lines with an invasive phenotype compared with non-invasive cell lines.3 Sarcosine increases in a progressive fashion in prostate cancer with 0, 42, and 79% of benign, localized, and metastatic prostate tissue samples containing increased levels of sarcosine.
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1. Glycine metabolism in animals and humans: Implications for nutrition and health. Amino Acids 45(3), 463-477 (2013).
2. Pharmacological assessment of the role of the glycine transporter GlyT-
3. Metabolomic profiles delineate potential role for sarcosine in prostate cancer progression. Nature 457(7231), 910-914 (2009).