In laboratory-grown human intestinal cells, adding vitamin B12 at a specific concentration is linked to changes in gene activity that promote fat metabolism and cell growth while reducing...
Mechanism
Synthesis from 1 study
Vitamin B12 helps intestinal cells turn off inflammation genes and turn on genes that help them grow and burn fat for energy. It does this by changing how DNA is marked, which controls gene activity, while also helping the cells use fat and oxygen more efficiently to fuel repair and growth.
Most probable mechanism
Vitamin B12 helps cells make more methionine, which is turned into a molecule that adds methyl groups to DNA. This turns off genes that cause inflammation and turns on genes that help cells burn fat for energy and grow. At the same time, vitamin B12 helps move fat into the cell's power plants to be burned, and it helps make molecules needed for oxygen use and cell growth, all of which support a healthier, more active intestinal lining.
Vitamin B12 acts as a cofactor for methionine synthase, converting homocysteine to methionine
Methionine is converted to S-adenosylmethionine (SAM), the primary methyl donor for DNA methylation
SAM directs DNA methyltransferases to add methyl groups to CpG sites in gene regulatory regions, silencing inflammatory genes and activating proliferation and metabolic genes
Vitamin B12 activates methylmalonyl-CoA mutase, converting methylmalonyl-CoA to succinyl-CoA, which enters the TCA cycle to generate energy intermediates
Succinyl-CoA is used to initiate heme biosynthesis, supporting oxygen-utilizing enzymes and mitochondrial respiration
Vitamin B12 increases carnitine levels and upregulates carnitine shuttle proteins, enabling long-chain fatty acids to enter mitochondria for β-oxidation
Fatty acid oxidation and TCA cycle activity provide ATP and biosynthetic precursors that support epithelial cell proliferation and barrier maintenance
Reduced production of pro-permeability lipid metabolites and increased expression of mucins and tight junction proteins enhance epithelial barrier integrity
Evidence from Studies
Supporting (1)
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Vitamin B12 Regulates the Transcriptional, Metabolic, and Epigenetic Programing in Human Ileal Epithelial Cells
Contradicting (0)
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