Journal
JOURNAL OF CLINICAL BIOCHEMISTRY AND NUTRITION
Volume 58, Issue 1, Pages 76-83Publisher
JOURNAL CLINICAL BIOCHEMISTRY & NUTRITION
DOI: 10.3164/jcbn.15-54
Keywords
non-alcoholic fatty liver disease; homocysteine; hyperhomocysteinemia; folate; vitamin B12
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Previous studies have reported inconsistent findings regarding the association between plasmatic higher of homocysteine level and non-alcoholic fatty liver disease. We aimed to investigate this association by conducting a meta-analysis. Literature was searched on PubMed from inception to January 2015. Eight studies evaluating plasma level of homocysteine in biopsy-proven non-alcoholic fatty liver disease subjects compared to healthy controls were included. Compared with the controls, non-alcoholic fatty liver disease patients witnessed a higher level of homocysteine [standard mean difference (SMD): 0.66 mu mol/L, 95% CI: 0.41, 0.92 mu mol/L], and were associated with a significant increased risk for hyperhomocysteinemia [odds ratio (OR) 5.09, 95% CI: 1.69, 15.32). In addition, patients with non-alcoholic fatty liver presented 0.45 mu mol/l. higher levels of homocysteine compared to healthy controls (95% CI: 0.09, 0.82 mu mol/L), whereas non-alcoholic steatohepatitis patients had 1.02 mu mol/L higher levels of homocysteine (95% CI: 0.28, 1.76 mu mol/L). There was neither difference of folate level nor vitamin B12 level between non-alcoholic fatty liver disease subjects and healthy controls. This study revealed that non-alcoholic fatty liver disease patients presented an increased serum concentration of homocysteine, and were associated with an increased risk of hyperhomocysteinemia. Further studies are needed to demonstrate a causal role of hyperhomocysteinemia in non-alcoholic fatty liver disease.
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