Abstract
Several studies explored the association between vitamin D status and nonalcoholic fatty liver disease with contradictory results. We aimed to investigate the association between vitamin D status, inflammatory cytokines and liver fibrosis in nonalcoholic fatty liver disease patients. Two hundred nineteen nonalcoholic fatty liver disease patients and 166 age- and gender- matched healthy controls were recruited for this study. Serum 25(OH)D was measured by radioimmunoassay. Serum interleukin-8 and transforming growth factor-β1 were measured using ELISA. Serum 25(OH)D was only marginally decreased in nonalcoholic fatty liver disease patients. Interestingly, serum 25(OH)D was markedly reduced in nonalcoholic fatty liver disease patients with advanced liver fibrosis compared to nonalcoholic fatty liver disease patients with indeterminate liver fibrosis and no advanced fibrosis. Logistic regression analysis showed that there was an inverse association between serum 25(OH)D and severity of liver fibrosis in nonalcoholic fatty liver disease patients. Further analysis showed that serum interleukin-8 was elevated in nonalcoholic fatty liver disease patients, the highest interleukin-8 in patients with advanced fibrosis. An inverse correlation between serum 25(OH)D and interleukin-8 was observed in nonalcoholic fatty liver disease patients with and without liver fibrosis. Although serum transforming growth factor-β1 was slightly elevated in nonalcoholic fatty liver disease patients, serum transforming growth factor-β1 was reduced in nonalcoholic fatty liver disease patients with advanced fibrosis. Unexpectedly, a positive correlation between serum 25(OH)D and transforming growth factor-β1 was observed in nonalcoholic fatty liver disease patients with advanced fibrosis. In conclusion, low vitamin D status is associated with advanced liver fibrosis in nonalcoholic fatty liver disease patients. Interleukin-8 may be an important mediator for hepatic fibrosis in nonalcoholic fatty liver disease patients with low vitamin D status.
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Abbreviations
- NAFLD:
-
nonalcoholic fatty liver disease
- 25(OH)D:
-
25-hydroxyvitamin D
- BMI:
-
body mass index
- ALT:
-
alanine aminotransferase
- AST:
-
aspartate aminotransferase
- ALP:
-
alkaline phosphatase
- GGT:
-
glutamyltransferase
- LDH:
-
lactate dehydrogenase
- HDL:
-
high-density lipoprotein
- LDL:
-
low density lipoprotein
- OR:
-
odds ratio
- NASH:
-
nonalcoholic steatohepatitis
- IL-8:
-
interleukin-8
- TGF-β:
-
transforming growth factor-β
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Acknowledgments
This project was supported by National Natural Science Foundation of China (81373495, 81471467), Natural Science Foundation of Anhui province (1308085MH120), Research Fund for Doctoral Program of Higher Education of China (20133420110005) and Research Fund for Fourth Affiliated Hospital of Anhui Medical University (FKY2014D05).
Author Contributions
XC and DXX conceived study. BBY collected data and carried out experiments. YHC and CZ carried out experiments and analyzed data. CES, KFH and JZ collected data. DXX and YHC wrote the paper. All authors read and approved the final manuscript.
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Bing-Bing Yang and Yuan-Hua Chen contributed equally to this work.
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Yang, BB., Chen, YH., Zhang, C. et al. Low vitamin D status is associated with advanced liver fibrosis in patients with nonalcoholic fatty liver disease. Endocrine 55, 582–590 (2017). https://doi.org/10.1007/s12020-016-1152-x
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DOI: https://doi.org/10.1007/s12020-016-1152-x