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Calcium oxalate monohydrate binding protein: a diagnostic biomarker for calcium oxalate kidney stone formers

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Abstract

Urinary oxalate is a biomarker for calcium oxalate kidney stone disease; however, its assay is insensitive and nonspecific. Calcium oxalate monohydrate (COM) binding protein (45 kDa) is a promoter of calcium oxalate kidney disease, which is markedly upregulated by oxalate induced oxidative stress. The current study was carried out to evaluate whether COM binding protein can serve as a diagnostic marker for calcium oxalate kidney stone formers. COM binding protein was isolated, purified and antibody was raised against it in rabbits. Urine samples (24 h) were collected from patients suffering from various kidney diseases such as acute nephritis, chronic nephritis, nephrotic syndrome, calcium oxalate (CaOx) stone formers, uric acid stone formers, struvite stone formers and calcium phosphate stone formers. This COM binding protein was quantified by an in house ELISA method and the excretion was found to lie between 2 and 3 mg in control samples, while in CaOx stone formers it was detected between 11 and 19 mg. Urinary risk factors were assayed. We conclude that COM binding protein can serve as a diagnostic marker for CaOx stone formers.

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Acknowledgement

Financial support from University Grant Commission (UGC), Government of India is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Medical Biochemistry, Dr. ALM PGIBMS, University of Madras, Taramani Campus, Chennai 600 113, India

    D. Asokan, P. Kalaiselvi, S. Muhammed Farooq & P. Varalakshmi

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  1. D. Asokan
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  2. P. Kalaiselvi
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  3. S. Muhammed Farooq
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  4. P. Varalakshmi
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Correspondence to P. Varalakshmi.

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Asokan, D., Kalaiselvi, P., Muhammed Farooq, S. et al. Calcium oxalate monohydrate binding protein: a diagnostic biomarker for calcium oxalate kidney stone formers. Urol Res 32, 357–361 (2004). https://doi.org/10.1007/s00240-004-0430-x

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  • DOI: https://doi.org/10.1007/s00240-004-0430-x

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