title: Methyl group balance in brain and liver: role of choline on increased S-adenosyl methionine (SAM) demand by chronic arsenic exposure.
abstract: Arsenic toxicity has been related to its interference with one carbon metabolism, where a high demand of S-adenosylmethionine (SAM) for arsenic methylation as well as a failure of its regeneration would compromise the availability of methyl groups for diverse cellular functions. Since exposed animals show disturbances of methylated products such as methylated arginines, myelin and axon membranes, this work investigates whether alterations of SAM, choline and phosphatidylcholine (PC) in the brain of arsenic exposed rats are associated with myelin alterations and myelin basic protein (MBP) immunoreactivity. Also these metabolites, morphologic and biochemical markers of methyl group alterations were analyzed in the liver, the main site of arsenic methylation. In adult, life-long arsenic exposed rats through drinking water (3 ppm), no changes of SAM, choline and PC concentrations where found in the brain, but SAM and PC were severely decreased in liver accompanied by a significant increase of choline. These results suggest that choline plays an important role as methyl donor in arsenic exposure, which could underlie hepatic affections observed when arsenic exposure is combined with other environmental factors. Also, important myelin and nerve fiber alterations, accompanied by a 75% decrease of MBP immunoreactivity were not associated with a SAM deficit in the brain.
authors.affiliation: Departamento de Bioquímica, Facultad de Medicina, Universidad Autónoma de San Luis Potosí, Av. V. Carranza 2405, CP 78210 San Luis Potosí S.L.P, Mexico.
authors.forename: Rosalva
authors.initials: R
authors.lastname: Ríos
authors.forename: Martha E
authors.initials: ME
authors.lastname: Santoyo
authors.forename: Daniela
authors.initials: D
authors.lastname: Cruz
authors.forename: Juan Manuel
authors.initials: JM
authors.lastname: Delgado
authors.forename: Sergio
authors.initials: S
authors.lastname: Zarazúa
authors.forename: María E
authors.initials: ME
authors.lastname: Jiménez-Capdeville
mesh_terms: D000818:Animals; D001151:Arsenic / Q000633:toxicity*; D020261:Arsenic Poisoning / Q000378:metabolism*; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D002794:Choline / Q000378:metabolism*; D005260:Female; D007150:Immunohistochemistry; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008745:Methylation; D010713:Phosphatidylcholines / Q000378:metabolism; D011247:Pregnancy; D051381:Rats; D017208:Rats, Wistar; D012436:S-Adenosylmethionine / Q000378:metabolism*; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D014280:Triglycerides / Q000378:metabolism
chemical_list: D010713:Phosphatidylcholines; D017392:Thiobarbituric Acid Reactive Substances; D014280:Triglycerides; D012436:S-Adenosylmethionine; D001151:Arsenic; D002794:Choline