The diagnostic value of serum concentrations of 2-(α-mannopyranosyl)-l-tryptophan for normal renal function

The diagnostic value of serum concentrations of 2-(α-mannopyranosyl)-l-tryptophan for normal renal function. We have previously reported that the serum concentration of 2-(α-mannopyranosyl)-l-tryptophan (MPT), tryptophan glycoconjugate, is a more accurate measure of renal function than that of serum...

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Veröffentlicht in:Kidney international 2004-04, Vol.65 (4), p.1395-1399
Hauptverfasser: Yonemura, Katsuhiko, Takahira, Reiko, Yonekawa, Osamu, Wada, Naohiro, Hishida, Akira
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creator Yonemura, Katsuhiko
Takahira, Reiko
Yonekawa, Osamu
Wada, Naohiro
Hishida, Akira
description The diagnostic value of serum concentrations of 2-(α-mannopyranosyl)-l-tryptophan for normal renal function. We have previously reported that the serum concentration of 2-(α-mannopyranosyl)-l-tryptophan (MPT), tryptophan glycoconjugate, is a more accurate measure of renal function than that of serum creatinine concentration. The aim of the present study was to compare the diagnostic value of serum concentrations of MPT and creatinine as a measure of normal renal function. A total of 156 subjects with serum creatinine concentration ≤1.60mg/dL aged 0 to 88years were recruited. Serum concentrations of MPT and creatinine, and creatinine clearance calculated by Cockcroft-Galt formula were determined. A diagnostic accuracy of serum concentrations of MPT and creatinine for normal renal function was analyzed by using receiver-operating characteristics (ROC) curves. In 82 subjects with normal renal function defined as calculated creatinine clearance ≥80mL/min (aged 6 to 68years), the correlations between age and/or urinary creatinine excretion, which is related to muscle mass, and serum concentrations of MPT or creatinine, were determined. In the ROC curve, the area under the curve (AUC) in serum MPT concentration was significantly greater than that of creatinine (0.855 versus 0.800, respectively, P < 0.001) and the cut-off levels associated with the greatest diagnostic accuracy were 90ng/mL for serum MPT concentration and 0.70mg/dL for serum creatinine concentration. The sensitivity, specificity, and positive and negative predictive values were 69.5%, 85.1%, 83.8%, and 71.6% for serum MPT concentration, and 53.7%, 81.1%, 75.9%, and 61.2% for serum creatinine concentration. A close correlation existed between serum creatinine concentration and age (r = 0.798, P < 0.0001) in 23 subjects aged 20years or younger. Conversely, serum MPT concentration remained unchanged regardless of age (r=-0.135, P = 0.228). Furthermore, a close correlation existed between serum creatinine concentration and urinary creatinine excretion (r = 0.817, P < 0.0001), but not between serum MPT concentration and urinary creatinine excretion (r = 0.082, P = 0.461). The concentration of serum MPT is a more reliable diagnostic parameter than that of serum creatinine as a measure of normal renal function, and renal function can be compared in subjects independently of age and muscle mass when serum MPT concentration is measured.
doi_str_mv 10.1111/j.1523-1755.2004.00521.x
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We have previously reported that the serum concentration of 2-(α-mannopyranosyl)-l-tryptophan (MPT), tryptophan glycoconjugate, is a more accurate measure of renal function than that of serum creatinine concentration. The aim of the present study was to compare the diagnostic value of serum concentrations of MPT and creatinine as a measure of normal renal function. A total of 156 subjects with serum creatinine concentration ≤1.60mg/dL aged 0 to 88years were recruited. Serum concentrations of MPT and creatinine, and creatinine clearance calculated by Cockcroft-Galt formula were determined. A diagnostic accuracy of serum concentrations of MPT and creatinine for normal renal function was analyzed by using receiver-operating characteristics (ROC) curves. 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We have previously reported that the serum concentration of 2-(α-mannopyranosyl)-l-tryptophan (MPT), tryptophan glycoconjugate, is a more accurate measure of renal function than that of serum creatinine concentration. The aim of the present study was to compare the diagnostic value of serum concentrations of MPT and creatinine as a measure of normal renal function. A total of 156 subjects with serum creatinine concentration ≤1.60mg/dL aged 0 to 88years were recruited. Serum concentrations of MPT and creatinine, and creatinine clearance calculated by Cockcroft-Galt formula were determined. A diagnostic accuracy of serum concentrations of MPT and creatinine for normal renal function was analyzed by using receiver-operating characteristics (ROC) curves. 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Urinary tract diseases</topic><topic>Osmolar Concentration</topic><topic>Predictive Value of Tests</topic><topic>Reference Values</topic><topic>renal function</topic><topic>ROC Curve</topic><topic>Sensitivity and Specificity</topic><topic>Tryptophan - analogs &amp; derivatives</topic><topic>Tryptophan - blood</topic><topic>tryptophan glycoconjugate</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yonemura, Katsuhiko</creatorcontrib><creatorcontrib>Takahira, Reiko</creatorcontrib><creatorcontrib>Yonekawa, Osamu</creatorcontrib><creatorcontrib>Wada, Naohiro</creatorcontrib><creatorcontrib>Hishida, Akira</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Calcium &amp; Calcified Tissue Abstracts</collection><collection>Nursing &amp; Allied Health Database</collection><collection>Health &amp; Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Medical Database (Alumni Edition)</collection><collection>ProQuest Pharma Collection</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>ProQuest One Community College</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>ProQuest Health &amp; Medical Complete (Alumni)</collection><collection>Health &amp; Medical Collection (Alumni Edition)</collection><collection>Medical Database</collection><collection>Nursing &amp; Allied Health Premium</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>MEDLINE - Academic</collection><jtitle>Kidney international</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yonemura, Katsuhiko</au><au>Takahira, Reiko</au><au>Yonekawa, Osamu</au><au>Wada, Naohiro</au><au>Hishida, Akira</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The diagnostic value of serum concentrations of 2-(α-mannopyranosyl)-l-tryptophan for normal renal function</atitle><jtitle>Kidney international</jtitle><addtitle>Kidney Int</addtitle><date>2004-04-01</date><risdate>2004</risdate><volume>65</volume><issue>4</issue><spage>1395</spage><epage>1399</epage><pages>1395-1399</pages><issn>0085-2538</issn><eissn>1523-1755</eissn><coden>KDYIA5</coden><abstract>The diagnostic value of serum concentrations of 2-(α-mannopyranosyl)-l-tryptophan for normal renal function. We have previously reported that the serum concentration of 2-(α-mannopyranosyl)-l-tryptophan (MPT), tryptophan glycoconjugate, is a more accurate measure of renal function than that of serum creatinine concentration. The aim of the present study was to compare the diagnostic value of serum concentrations of MPT and creatinine as a measure of normal renal function. A total of 156 subjects with serum creatinine concentration ≤1.60mg/dL aged 0 to 88years were recruited. Serum concentrations of MPT and creatinine, and creatinine clearance calculated by Cockcroft-Galt formula were determined. A diagnostic accuracy of serum concentrations of MPT and creatinine for normal renal function was analyzed by using receiver-operating characteristics (ROC) curves. In 82 subjects with normal renal function defined as calculated creatinine clearance ≥80mL/min (aged 6 to 68years), the correlations between age and/or urinary creatinine excretion, which is related to muscle mass, and serum concentrations of MPT or creatinine, were determined. In the ROC curve, the area under the curve (AUC) in serum MPT concentration was significantly greater than that of creatinine (0.855 versus 0.800, respectively, P &lt; 0.001) and the cut-off levels associated with the greatest diagnostic accuracy were 90ng/mL for serum MPT concentration and 0.70mg/dL for serum creatinine concentration. The sensitivity, specificity, and positive and negative predictive values were 69.5%, 85.1%, 83.8%, and 71.6% for serum MPT concentration, and 53.7%, 81.1%, 75.9%, and 61.2% for serum creatinine concentration. A close correlation existed between serum creatinine concentration and age (r = 0.798, P &lt; 0.0001) in 23 subjects aged 20years or younger. Conversely, serum MPT concentration remained unchanged regardless of age (r=-0.135, P = 0.228). Furthermore, a close correlation existed between serum creatinine concentration and urinary creatinine excretion (r = 0.817, P &lt; 0.0001), but not between serum MPT concentration and urinary creatinine excretion (r = 0.082, P = 0.461). The concentration of serum MPT is a more reliable diagnostic parameter than that of serum creatinine as a measure of normal renal function, and renal function can be compared in subjects independently of age and muscle mass when serum MPT concentration is measured.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><pmid>15086480</pmid><doi>10.1111/j.1523-1755.2004.00521.x</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record>
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subjects Adolescent
Adult
Aging - blood
Area Under Curve
Biological and medical sciences
Child
creatinine
Creatinine - blood
Creatinine - urine
creatinine clearance
Female
Humans
Ketoses - blood
Kidney Function Tests
Male
Medical sciences
Middle Aged
Nephrology. Urinary tract diseases
Osmolar Concentration
Predictive Value of Tests
Reference Values
renal function
ROC Curve
Sensitivity and Specificity
Tryptophan - analogs & derivatives
Tryptophan - blood
tryptophan glycoconjugate
title The diagnostic value of serum concentrations of 2-(α-mannopyranosyl)-l-tryptophan for normal renal function
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