title: Methionine restriction beyond life-span extension.
abstract: Dietary methionine restriction (MR) extends life span across species via various intracellular regulatory mechanisms. In rodents, MR induces resistance against adiposity, improves hepatic glucose metabolism, preserves cardiac function, and reduces body size, all of which can affect the onset of age-related diseases. Recent studies have shown that MR-affected biomarkers, such as fibroblast growth factor 21, adiponectin, leptin, cystathionine β synthase, and insulin-like growth factor 1, can potentially alter physiology. The beneficial effects of MR could be explained in part by its ability to reduce mitochondrial oxidative stress. Studies have revealed that MR can reduce reactive oxygen species that damage cells and promote cancer progression. It has been demonstrated that either MR or the targeting of specific genes in the methionine cycle could induce cell apoptosis while decreasing proliferation in several cancer models. The complete mechanism underlying the actions of MR on the cell cycle during cancer has not been fully elucidated. Epigenetic mechanisms, such as methylation and noncoding RNAs, are also possible downstream effectors of MR; future studies should help to elucidate some of these mechanisms. Despite evidence that changes in dietary methionine can affect epigenetics, it remains unknown whether epigenetics is a mechanism in MR. This review summarizes research on MR and its involvement in metabolism, cancer, and epigenetics.
authors.affiliation: Orentreich Foundation for the Advancement of Science, Cold Spring, New York.
authors.forename: Gene P
authors.initials: GP
authors.lastname: Ables
authors.affiliation: Orentreich Foundation for the Advancement of Science, Cold Spring, New York.
authors.forename: Julie R
authors.initials: JR
authors.lastname: Hens
authors.affiliation: Orentreich Foundation for the Advancement of Science, Cold Spring, New York.
authors.forename: Sailendra N
authors.initials: SN
authors.lastname: Nichenametla
mesh_terms: D050154:Adiposity; D000818:Animals; D001842:Bone and Bones / Q000033:anatomy & histology / Q000378:metabolism; D031204:Caloric Restriction; D004032:Diet; D018450:Disease Progression; D044127:Epigenesis, Genetic; D005947:Glucose / Q000378:metabolism; D006801:Humans; D008017:Life Expectancy; D050356:Lipid Metabolism; D008099:Liver / Q000378:metabolism / Q000473:pathology; D008715:Methionine / Q000378:metabolism*; D009206:Myocardium / Q000378:metabolism; D009369:Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D018384:Oxidative Stress; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D017382:Reactive Oxygen Species; D008715:Methionine; D005947:Glucose
keywords: adiposity resistance; antioxidant; cancer progression; epigenetics; life-span extension; methionine restriction