Creatinine at the Evaluation of Urinary 1-Methyladenosine and Pseudouridine Excretion

• Published in: The Tohoku Journal of Experimental Medicine Vol. 188; no. 2; pp. 133 - 138
• Main Authors: Honda, Ichiyo, Itoh, Kunihiko, Mizugaki, Michinao, Sasaki, Takeshi
• Format: Journal Article
• Language: English
• Published: Japan Tohoku University Medical Press 1999
• Subjects: 1-methyladenosine; Adenosine - analogs & derivatives; Adenosine - urine; Creatinine - urine; creatinine excretion; Enzyme-Linked Immunosorbent Assay; False Positive Reactions; Female Urogenital Diseases - urine; Humans; Kidney Diseases - urine; Male Urogenital Diseases; modified nucleosides; Neoplasms - urine; pseudouridine; Pseudouridine - urine
• ISSN: 0040-8727; 1349-3329
• DOI: 10.1620/tjem.188.133

The elevation of urinary modified nucleosides levels in urine is found in patients with cancers. In the precent study, we have tested 616 urine samples randomly collected from non-malignant cases. Thirty-two percent (194/616) and 11% (68/616) had elevated levels of 1-methyladenosine and pseudouridine, respectively (They are designated as false-positive cases). To elucidate the cause on non-specific elevation of the nucleosides, the correlation between creatinine excretion level and urinary nucleosides levels were determined. The result revealed that false-positive cases were frequently detected in patients with lower creatinine excretion levels. The mean creatinine levels of false-positive cases were significantly lower than those of negative cases. From these results, the false-positive of urinary 1-methyladenosine and pseudouridine might be due to the low creatinine excretion mainly caused by the renal dysfunction. Creatinine excretion in each individual should be taken into consideration in case of determining urinary modified nucleosides.