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Evaluation of inactive Matrix-Gla-Protein (MGP) as a biomarker for incident and recurrent kidney stones

Abstract

Background

Matrix-Gla-protein (MGP) is an inhibitor of vascular calcification. Its dephosphorylated and uncarboxylated inactive form, dpucMGP, is a marker of vitamin K status and of cardio-vascular outcomes in chronic kidney disease. We hypothesized that higher serum dpucMGP would be a biomarker of kidney stone disease.

Methods

We measured serum dpucMGP in incident symptomatic kidney stone-formers and non-stone formers at a baseline visit. Symptomatic stone recurrence was assessed in the stones formers over a 5-year period. The association of dpucMGP with incident or recurrent kidney stones was assessed with and without adjustment for clinical, blood, and urine characteristics.

Results

There was no significant difference in serum dpucMGP level between 498 stone formers and 395 non-stone former (510 vs 501 pmol/L; p = 0.66). In a multivariable model adjusting for clinical, blood and urine chemistries, higher MGP was associated with lower risk of stone formation (OR = 0.674, 95% CI 0.522–0.870), contrary to previous reports. Among 375 stone formers with 5 years of follow-up, 79 (21%) had symptomatic recurrence. No difference in serum dpucMGP was evident in recurrent versus non-recurrent stone-formers (482 vs 502 pmol/L; p = 0.26). Serum dpucMGP was correlated with cystatin C levels in non stone-formers, incident stone-formers and recurrent stone-formers (r > 0.3, p < 0.0001).

Conclusion

Elevated serum dpucMGP was not associated with incident or recurrent symptomatic kidney stone events. However, higher level of dpucMGP was associated with lower risk of kidney stone in a multivariable logistic regression model.

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Acknowledgements

The authors would like to thanks IDS for providing the MGP reagents.

Author information

Correspondence to Vincent Castiglione.

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Conflict of interest

PD and EC declare honoraria of consultancy for IDS. The results presented in this paper have not been published previously in whole or part, except in abstract format.

Ethical approval

This study is in accordance with the 1964 Declaration of Helsinki and has been approved by the Mayo Clinic Institutional Review Board (IRB:08–006541).

Informed consent

Informed consent was obtained from all individual participants included in the study.

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Cite this article

Castiglione, V., Pottel, H., Lieske, J.C. et al. Evaluation of inactive Matrix-Gla-Protein (MGP) as a biomarker for incident and recurrent kidney stones. J Nephrol 33, 101–107 (2020). https://doi.org/10.1007/s40620-019-00623-0

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Keywords

  • Nephrolithiais
  • Matrix-Gla-protein
  • Biomarker
  • Cystatin C