Choline metabolism

Choline metabolism refers to a network of biochemical pathways responsible for the uptake, utilization, transformation, and recycling of the essential nutrient choline within cells. Choline is required for synthesizing major membrane phospholipids such as phosphatidylcholine and sphingomyelin—critical components for cellular structure—and serves as a precursor for acetylcholine, an important neurotransmitter involved in muscle control and cognition. Additionally, through its oxidation to betaine, it donates methyl groups necessary for one-carbon metabolism and epigenetic regulation. The pathway involves several key enzymes—including choline kinase, phospholipases, choline dehydrogenase, among others—and specialized transporters that regulate cellular uptake. Dysregulation or altered flux through these pathways is implicated in various diseases such as cancer (where increased activity supports rapid cell proliferation), nonalcoholic fatty liver disease, cardiovascular disorders via gut microbiota-derived metabolites like trimethylamine-N–oxide (TMAO), neurodegeneration due to impaired acetylcholine synthesis or membrane integrity loss. Because multiple enzymes within this metabolic network are upregulated or mutated in certain cancers—leading to characteristic changes detectable by imaging—components of the pathway have emerged as potential therapeutic targets with ongoing research into specific enzyme inhibitors.[1][3][4][6][7]

Inhibition of key enzymes in the pathway to disrupt cell membrane biosynthesis or methylation cycles in cancer cells[2][4]