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FGF-23 c-terminal arithmetic mean values at timepoint 0 were 271.9 U/ml, at day 3 98.1 U/ml, at day 6 91.0 U/ml and at day 9 after fracture 69.8 U/ml (all p http://www.selleckchem.com/products/gsk1120212-jtp-74057.html 2Kyowa Hakko Kirin, Japan Background: X-linked hypophosphatemia is the most common renal phosphate wasting disorder caused by excess circulating fibroblast growth factor 23 (FGF23). Klotho is a critical cofactor for FGF23 http://www.selleck.cn/products/blu9931.html signaling. Klotho exists in both membrane bound and soluble forms. The purpose of this study was to test the hypothesis that serum klotho concentrations are altered in XLH. Methods: This was a cross-sectional study of 34 XLH subjects (16 children, 18 adults) and 41 healthy control subjects (22 children, 19 adult). Nine XLH subjects were receiving treatment with calcitriol and phosphate at the time of sampling and the rest were not on treatment. We measured serum klotho concentrations using an ELISA (Immunobiological Laboratories Co. Ltd. (Japan)). Intact FGF23 was measured using an ELISA (Kainos, Japan). Serum phosphate, calcium, creatinine and alkaline phosphatase were measured using standard clinical methods. To normalize distribution, klotho concentrations were log-transformed for statistical analysis. T-test was used for analysis. Results: Subject ages for control subjects ranged from 1.3 to 54.1 years. Ages for XLH subjects were 1.1 to 69.4 years. Mean serum klotho concentrations were 1051 �� 599 pg/ml for healthy children, 282 �� 134 in healthy adults, 707 �� 280 pg/ml for XLH children and 311 �� 125 for adults. LogKlotho was not significantly http://www.selleckchem.com/products/Bortezomib.html different between adult XLH patients and controls, but there was a trend for children with XLH to have lower Logklotho than controls (p=0.07). LogKlotho was not significantly different between treated and untreated XLH subjects. Serum klotho concentrations were higher in children than adults for both controls and XLH (p