The association between vitamin B12, albuminuria and reduced kidney function: an observational cohort study.

Abstract:

BACKGROUND:Variants in CUBN, the gene encoding cubilin, a proximal tubular transport protein, have been associated with albuminuria and vitamin B12 (B12) deficiency. We hypothesized that low levels of B12 would be associated with albuminuria in a population-based cohort. METHODS:We analyzed participants from the Framingham Heart Study (n = 2965, mean age 58 years, 53% female) who provided samples for plasma B12. Logistic regression models adjusted for covariates including homocysteine were constructed to test the association between B12 and prevalent albuminuria (UACR ≥17 mg/g [men] and ≥25 mg/g [women]) and reduced kidney function (defined as an eGFR < 60 ml/min/1.73 m(2), RKF). Because of a significant interaction between B12 and homocysteine in the prevalent RKF model (p = 0.005), the model was stratified by the median homocysteine levels. Logistic regression models were constructed to test the association between B12 and incident albuminuria and RKF. The results were replicated in 4445 participants from NHANES 2003-2004. RESULTS:Baseline B12 levels ranged from 50-1690 pg/ml. Elevated B12 was associated with prevalent albuminuria (OR 1.44 per 1 SD increase, 95% CI 1.10-1.87) and RKF (OR 1.83, 95% CI 1.30-2.60). However after stratifying by median homocysteine levels, this relationship remained only in the higher homocysteine stratum. There was no association between B12 and incident albuminuria (OR 1.17, 95% CI 0.79 - 1.73) or RKF (OR 1.45, 95% CI 0.97 - 1.88). In the NHANES cohort, elevated B12 was associated with RKF after full covariate adjustment (OR 3.06, 95% CI 2.30-4.08). There was no association with albuminuria. CONCLUSION:In participants with high baseline homocysteine levels, increased plasma B12 was associated with RKF.

journal_name

BMC Nephrol

journal_title

BMC nephrology

authors

McMahon GM,Hwang SJ,Tanner RM,Jacques PF,Selhub J,Muntner P,Fox CS

doi

10.1186/1471-2369-16-7

subject

Has Abstract

pub_date

2015-02-02 00:00:00

pages

7

issn

1471-2369

pii

1471-2369-16-7

journal_volume

16

pub_type

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