title: S-adenosylmethionine and S-adenosylhomocysteine levels in the aging brain of APP/PS1 Alzheimer mice.
abstract: Hyperhomocysteinemia and factors of homocysteine metabolism, S-adenosylhomocysteine (AdoHcy) and S-adenosylmethionine (AdoMet), may play a role in Alzheimer's disease (AD). With liquid-chromatography-tandem-mass-spectrometry AdoMet and AdoHcy were determined in brains of 8- and 15-month-old APP/PS1 Alzheimer mice, and their possible roles in AD brains investigated. The finding that AdoMet levels do not differ between the genotypes in (young) 8-month-old mice, but are different in (older) 15-month-old APP/PS1 mice compared to their wild-type littermates, suggests that alterations in AdoMet are a consequence of AD pathology rather than a cause. During aging, AdoMet levels decreased in the brains of wild-type mice, whereas AdoHcy levels diminished in both wild type and APP/PS1 mice. The finding that AdoMet levels in APP/PS1 mice are not decreased during aging (in contrast to wild-type mice), is probably related to less demand due to neurodegeneration. No effect of the omega-3 fatty acid docosahexaenoic acid (DHA) or cholesterol-enriched diets on AdoMet or AdoHcy levels were found.
authors: Department of Anatomy and Department of Cognitive Neuroscience, Donders Centre for Neuroscience, Radboud University Nijmegen Medical Centre, 6500 HB, Nijmegen, The Netherlands.
authors: Carlijn R
authors: CR
authors: Hooijmans
authors: Henk J
authors: HJ
authors: Blom
authors: Dinny
authors: D
authors: Oppenraaij-Emmerzaal
authors: Merel
authors: M
authors: Ritskes-Hoitinga
authors: Amanda J
authors: AJ
authors: Kiliaan
mesh_terms: D000367:Age Factors; D000375:Aging; D000544:Alzheimer Disease / Q000235:genetics / Q000473:pathology*; D016564:Amyloid beta-Protein Precursor / Q000235:genetics; D000704:Analysis of Variance; D000818:Animals; D001921:Brain / Q000378:metabolism*; D002853:Chromatography, Liquid / Q000379:methods; D004195:Disease Models, Animal; D006801:Humans; D051379:Mice; D008822:Mice, Transgenic; D053764:Presenilin-1 / Q000235:genetics; D012435:S-Adenosylhomocysteine / Q000378:metabolism*; D012436:S-Adenosylmethionine / Q000378:metabolism*; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D016564:Amyloid beta-Protein Precursor; D053764:Presenilin-1; D012436:S-Adenosylmethionine; D012435:S-Adenosylhomocysteine