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- W2034184461 abstract "We developed a sensitive reversed-phase high performance liquid chromatography (HPLC) assay to measure free and total Pyridinoline (Pyr) and Deoxypyridinoline (Dpyr) in serum. The method was used to measure total serum levels in seven premenopausal women (ages 52.2 +/- 2.4 years) and to investigate the renal clearance of free and conjugated Pyr and Dpyr in two groups of children (group 1: 13 girls, ages 11-13 years; group 2: 18 older children [2 male, 16 female], ages 13-18 years). Blood and 24-h urine samples were collected from the younger group to measure the renal clearance, and blood and 2-h morning urine samples from the older group were collected to investigate the fractional clearance. Total Pyr and Dpyr in the premenopausal women was 4.08 +/- 0.91 and 1.18 +/- 0.39 nmol/l, respectively. Free and total Pyr and Dpyr in serum and urine was elevated in both groups of children. The free serum levels were 16 and 18% in young and older children, respectively, compared with 40 and 46% in the urine. The percentage of free Dpyr in serum decreased with total urinary Pyr excretion (r = -0.56, p < 0.005, n = 31). The renal clearance of the free cross-link fraction in both groups was 4-fold higher than the conjugated fraction. The fractional clearance of the free fraction was greater than 1 (p < 0.001) and the conjugated fraction less than 1 (p < 0.001). The fractional excretion of free Dpyr increased with total urinary Pyr excretion (r = 0.66, p < 0.005, n = 13). We conclude that HPLC can be used to measure free and total Pyr and Dpyr in serum and that some free Pyr and Dpyr excreted in urine is produced by the kidney." @default.
- W2034184461 created "2016-06-24" @default.
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- W2034184461 date "2010-02-24" @default.
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- W2034184461 title "The renal clearance of free and conjugated pyridinium cross-links of collagen" @default.
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- W2034184461 doi "https://doi.org/10.1002/jbmr.5650111220" @default.
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