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Saudi Journal of Kidney Diseases and Transplantation
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ORIGINAL ARTICLE Table of Contents   
Year : 2017  |  Volume : 28  |  Issue : 2  |  Page : 268-272
Assay of urinary protein carbonyl content can predict the steroid dependence and resistance in children with idiopathic nephrotic syndrome

1 Department of Biochemistry, Mahatma Gandhi Medical College and Research Institute (MGMC & RI), SBV, Pillaiyarkuppam, Puducherry, India
2 Department of Biochemistry, Maulana Azad Medical College, New Delhi, India
3 Maulana Azad Institute of Dental Sciences, New Delhi, India
4 Department of Neonatology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
5 Department of Transfusion Medicine, Vinayaka Mission's Kirupananda Variyar Medical College and Hospitals, Salem, Tamil Nadu, India

Correspondence Address:
Niranjan Gopal
Department of Biochemistry, Mahatma Gandhi Medical College and Research Institute (MGMC & RI), SBV, Pillaiyarkuppam, Puducherry - 607 402
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1319-2442.202764

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Nephrotic syndrome in pediatric age is mostly idiopathic. Idiopathic nephrotic syndrome (INS) by default is treated with steroids from the very beginning. Some do not respond to steroids and are grouped later as either steroid-resistant (SR) or steroid-dependent (SD) cases. The protein selectivity index often fails to predict the SR and SD cases. The SD and SR cases of INS exhibit higher degrees of oxidative stress compared to steroid responders. Proteins get carbonylated when they are exposed to free radicals. The significance of excretion of these carbonylated proteins in urine is yet to be studied in detail. In this study, 70 cases of INS were enrolled, and urinary protein carbonyl content (UPCC) was estimated by Levine’s method before starting the steroid therapy. All the cases were followed up and, based on the response to steroid therapy, were grouped as Group A (n = 47). Steroid sensitive and Group B (n = 23), SD + SR cases. UPCC was significantly higher in Group B compared to Group A. Receiver–operating curve showed at a cutoff limit of 5.10 nmoles/mg of protein, UPCC can predict SD or SR cases with 83.3% sensitivity and 85.2% specificity and area under the curve of 0.833, P<0.05. UPCC levels more than 5.10 nmoles/mg of protein, before starting the therapy can predict SD or SR in pediatric INS cases.

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