Measurement of arginine derivatives in pediatric patients with chronic kidney disease using high-performance liquid chromatography-tandem mass spectrometry.
BACKGROUND
The arginine derivatives asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA) interfere with endothelial nitric oxide synthesis. Plasma ADMA and SDMA have been shown to be risk factors for cardiovascular disease and/or kidney function deterioration in a variety of patient populations.


METHODS
We developed a method to quantitatively measure arginine, ADMA, and SDMA using HPLC-tandem mass spectrometry. 13C6-L-Arginine was used as the internal standard, while the derivatives were separated on a silica column in less than 14 min. Plasma levels of ADMA, SDMA, and arginine were measured in children with stage II or III chronic kidney disease (CKD) and age- and gender-matched siblings.


RESULTS
The chromatography exhibited no observable ion suppression in the patient specimens tested. There was no apparent carryover for any of the analytes. The assay was linear over 0.32-2.29, 0.23-4.43, and 1.00-303.89 micromol/L for ADMA, SDMA, and arginine, respectively. Plasma ADMA, SDMA, and arginine (mean+/-SD) were 1.10+/-0.35, 2.06+/-1.11, and 57.93+/-22.10 mumol/L for children with CKD, and 0.78+/-0.16, 0.71+/-0.23, and 65.29+/-21.30 micromol/L for the healthy siblings.


CONCLUSIONS
The method exhibited no observable ion suppression in the patient specimens tested and has an acceptably short analytical cycle time. Children with CKD had higher levels of ADMA and SDMA than the healthy siblings.
Department of Pathology and Laboratory Medicine, Children's Memorial Hospital, Northwestern University Feinberg School of Medicine, Chicago, IL, USA. wangs2@ccf.org
Sihe
S
Wang
Faye B
FB
Vicente
Alan
A
Miller
Ellen R
ER
Brooks
Heather E
HE
Price
Frederick A
FA
Smith
D000293:Adolescent; D001120:Arginine / Q000031:analogs & derivatives / Q000097:blood* / Q000737:chemistry; D015415:Biomarkers / Q000097:blood / Q000737:chemistry; D016022:Case-Control Studies; D002648:Child; D002851:Chromatography, High Pressure Liquid; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000097:blood* / Q000175:diagnosis; D008297:Male; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D035781:Siblings; D053719:Tandem Mass Spectrometry; D013997:Time Factors
D015415:Biomarkers; C487735:dimethylarginine; C024917:symmetric dimethylarginine; C018524:N,N-dimethylarginine; D001120:Arginine