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  • Title: Crohn's disease and vitamin B12 metabolism.
    Author: Lambert D, Benhayoun S, Adjalla C, Gelot MA, Renkes P, Felden F, Gerard P, Belleville F, Gaucher P, Guéant JL, Nicolas JP.
    Journal: Dig Dis Sci; 1996 Jul; 41(7):1417-22. PubMed ID: 8689919.
    Abstract:
    The concentrations of vitamin B12, its analogs, and the haptocorrin and transcobalamin carriers in 21 patients suffering from Crohn's disease and a group of controls (20 adults) were measured. There were no significant differences in the mean values for vitamin B12, total corrinoids (vitamin B12 + analogs), or vitamin B12 or total corrinoids bound to haptocorrin or transcobalamin of the Crohn's and control patients. There was a significant increase in the binding capacity of transcobalamin in the Crohn's patients compared to the controls (P < 0.001), but there was no difference in the binding capacities of haptocorrin. The serum concentrations of the markers of vitamin B12 status, homocysteine and methylmalonic acid, showed an increase (P < 0.01) in homocysteine in the Crohn's disease patients, but no change in methylmalonic acid. As the hyperhomocysteinemia was associated with normal folate concentrations, there may have been a defect in the activation of the enzyme due to altered intracellular vitamin B12 status.
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