Abstract:
OBJECTIVE:To investigate the lipotropic action of betaine on plasma lipoproteins and tissue lipids. METHODS AND RESULTS:Adult mice, wild type (+/+) or heterozygous (+/-) for a disruption of the methylenetetrahydrofolate reductase (Mthfr) gene, were supplemented with betaine for 1 year and compared with mice on control diets. Outcome measures were plasma homocysteine and lipoprotein levels, aortic and liver morphology, and liver staining for 3-nitrotyrosine (oxidative stress marker) and Apolipoprotein A-I (ApoA-I). We also investigated short-term effects of supplemental betaine on plasma lipoproteins in Mthfr +/+ and +/- mice. Both genotypes showed significantly lower plasma homocysteine after long-term betaine supplementation, and lower plasma triglycerides and higher HDL-cholesterol after both short- and long-term betaine. Lipid accumulation in liver and aortic wall tended to be lower in Mthfr+/+ compared to Mthfr+/- mice and in betaine-supplemented compared to unsupplemented mice. Nitrotyrosine staining was higher and ApoA-I staining was lower in livers of Mthfr+/- compared to Mthfr+/+ mice. Betaine did not affect staining of nitrotyrosine but increased ApoA-I staining. A significant negative correlation was observed between plasma homocysteine and liver ApoA-I. CONCLUSIONS:Mild MTHFR deficiency in mice is associated with increased risk for atherosclerotic disease. Betaine has a lipotropic effect, which is associated with a reduction in homocysteine, an increase in ApoA-I and an amelioration of the atherogenic risk profile.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Schwahn BC,Wang XL,Mikael LG,Wu Q,Cohn J,Jiang H,Maclean KN,Rozen Rdoi
10.1016/j.atherosclerosis.2007.06.030subject
Has Abstractpub_date
2007-12-01 00:00:00pages
e100-7issue
2eissn
0021-9150issn
1879-1484pii
S0021-9150(07)00403-0journal_volume
195pub_type
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