Relationship Between Chronic Kidney Disease, Glucose Homeostasis, and Plasma Osteocalcin Carboxylation and Fragmentation.

Journal of Renal Nutrition : the Official Journal of the Council on Renal Nutrition of the National Kidney Foundation
Mario KratzIan H de Boer

Abstract

Chronic kidney disease (CKD) is associated with reduced insulin sensitivity, through mechanisms that are not well understood. Low vitamin K intake and incomplete carboxylation of the vitamin K-dependent protein osteocalcin may promote insulin resistance. We assessed relationships of osteocalcin concentration, carboxylation, and fragmentation with CKD and glucose homeostasis in a cross-sectional study. We included 87 participants without diabetes: 50 (27 female) with moderate to severe CKD (estimated glomerular filtration rate <60 mL/min/1.73 m2 not treated with dialysis) and 37 (17 female) healthy controls. Total osteocalcin was measured by immunoassay, and osteocalcin carboxylation and fragmentation status by liquid chromatography-electrospray ionization-based mass spectrometric immunoassay. Endpoints included glucose tolerance (based on 2-hour oral glucose tolerance test), insulin sensitivity (hyperinsulinemic-euglycemic clamp), and pancreatic beta-cell function (intravenous glucose tolerance test). The total plasma osteocalcin concentration was higher in the CKD group (mean [standard deviation] 102.9 [147.5]) than that in the control group (53.6 [51.1] ng/mL, P = .03), and more osteocalcin was circulating as fragments. The e...Continue Reading

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Citations

May 16, 2021·Journal of Renal Nutrition : the Official Journal of the Council on Renal Nutrition of the National Kidney Foundation·Connie M RheeLinda W Moore

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