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The recent success of enzyme replacement therapy (ERT) for MPS I highlights the need for biomarkers that reflect response to such therapy. To determine which biochemical markers are better, we determined serum and urine DS and HS levels by liquid chromatography tandem mass spectrometry in ERT\u2010treated MPS I patients. The group included one Hurler, 11 Hurler\/Scheie, and two Scheie patients. Seven patients were treated from week 1, whereas the other seven were treated from week 26. Serum and urine DS (\u0394Di\u20104S\/6S) and HS (\u0394DiHS\u20100S, \u0394DiHS\u2010NS) were measured at baseline, week 26, and week 72. Serum \u0394Di\u20104S\/6S, \u0394DiHS\u20100S, and \u0394DiHS\u2010NS levels decreased by 72%, 56%, and 56%, respectively, from baseline at week 72. Urinary glycosaminoglycan level decreased by 61.2%, whereas urine \u0394Di\u20104S\/6S, \u0394DiHS\u20100S, and \u0394DiHS\u2010NS decreased by 66.8%, 71.8%, and 71%, respectively. Regardless of age and clinical severity, all patients showed marked decrease of DS and HS in blood and urine samples. We also evaluated serum DS and HS from dried blood\u2010spot samples of three MPS I newborn patients, showing marked elevation of DS and HS levels compared with those in control newborns. In conclusion, blood and urine levels of DS and HS provide an intrinsic monitoring and screening tool for MPS I patients.<\/jats:p>","DOI":"10.1007\/s10545-009-9036-3","type":"journal-article","created":{"date-parts":[[2010,2,16]],"date-time":"2010-02-16T08:08:17Z","timestamp":1266307697000},"page":"141-150","source":"Crossref","is-referenced-by-count":59,"title":["Dermatan sulfate and heparan sulfate as a biomarker for mucopolysaccharidosis I"],"prefix":"10.1002","volume":"33","author":[{"given":"Shunji","family":"Tomatsu","sequence":"first","affiliation":[{"name":"Department of Pediatrics Saint Louis University St. Louis MO USA"},{"name":"Department of Pediatrics Saint Louis University Doisy Research Center 1100 South Grand Blvd., Room 307 St. Louis MO 63104 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Adriana M.","family":"Monta\u00f1o","sequence":"additional","affiliation":[{"name":"Department of Pediatrics Saint Louis University St. Louis MO 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