Abstract
Background:
Recent studies showing an inverse association between estimated glomerular filtration rate (eGFR), a microvascular trait, and inactive desphospho-uncarboxylated matrix Gla protein (dp-ucMGP) support the hypothesis that after vitamin K'dependent activation, matrix Gla protein (MGP) is renoprotective, but these were limited by their cross-sectional design.
Methods:
In 1009 randomly recruited Flemish (50.6% women), we assessed the association between eGFR and plasma dpucMGP, using multivariable-adjusted analyses.
Results:
From baseline to follow-up 8.9 years later (median), dp-ucMGP increased by 23.0% whereas eGFR decreased by 4.05 mL/min/1.73 m2 (P< 0.001). In 938 participants with baseline eGFR 60 mL/min/1.73 m2, the incidence of eGFR<60 mL/min/1.73 m2 at follow-up was 8.0% versus 4.1% in the top versus the bottom halve of baseline dp-ucMGP. For a 5-fold higher plasma dp-ucMGP at baseline, eGFR at follow-up decreased by 3.15 mL/min/1.73 m2 [95% confidence interval (CI) 1.26-5.05; P = 0.001]. The hazard ratio expressing the risk of progression to eGFR<60 mL/min/1.73 m2 was 3.49 (95% CI 1.45-8.40; P = 0.005). The hazard ratio relating the presence of microalbuminuria at follow-up to baseline dp-ucMGP was 4.70 (95% CI 1.57-14.1; P = 0.006).
Conclusions:
In conclusion, circulating inactive dp-ucMGP, a biomarker of poor vitamin K status, predicts renal dysfunction. Possible underlying mechanisms include protection by activated MGP against calcification and inhibition of the bone morphogenetic protein-signalling pathway.
Original language | English |
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Pages (from-to) | 1122-1128 |
Number of pages | 7 |
Journal | Nephrology Dialysis Transplantation |
Volume | 33 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 2018 |
Externally published | Yes |
Bibliographical note
Funding Information:The study was supported by the grants from the European Union (HEALTH-FP7-278249-EUMASCARA, HEALTH-F7-305507 HOMAGE) and the European Research Council (Advanced Researcher Grant 2011-294713-EPLORE and Proof-of-Concept Grant 713601-uPROPHET) and the Fonds voor Wetenschappelijk Onderzoek Vlaanderen, Ministry of the Flemish Community, Brussels, Belgium (G.0881.13, G.088013, and 11Z0916N) currently supports the Studies Coordinating Centre in Leuven.
Publisher Copyright:
© 2018 The Author(s).