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Plasma homocysteine level and hepatic sulfur amino acid metabolism in mice fed a high-fat diet

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Abstract

Purpose

Obesity, a feature of metabolic syndrome, is a risk factor for cardiovascular disease, and elevated plasma homocysteine is associated with increased cardiovascular risk. However, little published information is available concerning the effect of obesity on homocysteine metabolism.

Methods

Hepatic homocysteine metabolism was determined in male C57BL/6 mice fed a high-fat diet for 12 weeks.

Results

High-fat diet increased plasma homocysteine but decreased hepatic homocysteine levels. Hepatic S-adenosylhomocysteine hydrolase levels were down-regulated in the obese mice, which was in part responsible for the decrease in hepatic S-adenosylmethionine/S-adenosylhomocysteine, which served as an index of transmethylation potential. Despite the decrease in hepatic cysteine, hepatic taurine synthesis was activated via up-regulation of cysteine dioxygenase. Hepatic levels of methionine adenosyltransferase I/III, methionine synthase, methylene tetrahydrofolate reductase, and gamma-glutamylcysteine ligase catalytic subunit were unchanged. Obese mice showed elevated betaine-homocysteine methyltransferase and decreased cystathionine beta-synthase activities, although the quantities of these enzymes were unchanged.

Conclusion

This study suggests that plasma homocysteine level is increased in obesity-associated hepatic steatosis, possibly as a result of increased hepatic homocysteine efflux along with an altered sulfur amino acid metabolism.

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Acknowledgments

This work was supported by the Basic Science Research Program (2009-0076058, 2010-0007554) and by the Priority Research Centers Program (2009-0093815) through a Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science, and Technology.

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Correspondence to Sang Kyum Kim.

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Yun, K.U., Ryu, C.S., Oh, J.M. et al. Plasma homocysteine level and hepatic sulfur amino acid metabolism in mice fed a high-fat diet. Eur J Nutr 52, 127–134 (2013). https://doi.org/10.1007/s00394-011-0294-0

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  • DOI: https://doi.org/10.1007/s00394-011-0294-0

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