Title : Metformin increases liver accumulation of vitamin B12 - an experimental study in rats.

Pub. Date : 2013 May

PMID : 23402786






12 Functional Relationships(s)
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1 Metformin increases liver accumulation of vitamin B12 - an experimental study in rats. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
2 AIMS/HYPOTHESIS: Patients treated with metformin exhibit low levels of plasma vitamin B12 (B12), and are considered at risk for developing B12 deficiency. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
3 AIMS/HYPOTHESIS: Patients treated with metformin exhibit low levels of plasma vitamin B12 (B12), and are considered at risk for developing B12 deficiency. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
4 AIMS/HYPOTHESIS: Patients treated with metformin exhibit low levels of plasma vitamin B12 (B12), and are considered at risk for developing B12 deficiency. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
5 In this study, we investigated the effect of metformin treatment on B12 uptake and distribution in rats. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
6 RESULTS: Three weeks of metformin treatment reduced plasma B12 by 22% or 289 [47-383] pmol/L (median and [range]) (p = 0.001), while no effect was observed on unsaturated B12-binding capacity. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
7 RESULTS: Three weeks of metformin treatment reduced plasma B12 by 22% or 289 [47-383] pmol/L (median and [range]) (p = 0.001), while no effect was observed on unsaturated B12-binding capacity. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
8 Compared with controls, the amount of B12 in the liver was 36% (p = 0.007) higher in metformin-treated rats, while the B12 content in the kidney was 34% (p = 0.013) lower. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
9 Compared with controls, the amount of B12 in the liver was 36% (p = 0.007) higher in metformin-treated rats, while the B12 content in the kidney was 34% (p = 0.013) lower. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
10 CONCLUSIONS/INTERPRETATION: These results show that metformin treatment increases liver accumulation of B12, thereby resulting in decreases in circulating B12 and kidney accumulation of the vitamin. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
11 CONCLUSIONS/INTERPRETATION: These results show that metformin treatment increases liver accumulation of B12, thereby resulting in decreases in circulating B12 and kidney accumulation of the vitamin. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens
12 Our data questions whether the low plasma B12 observed in patients treated with metformin reflects impaired B12 status, and rather suggests altered tissue distribution and metabolism of the vitamin. Metformin NADH:ubiquinone oxidoreductase subunit B3 Homo sapiens