Min Wang1, Minxian Wang1, Ru Zhang1, Chao Shen2, Liuxin Zhang1, Yajie Ding1, Zongzhe Tang1, Hongliang Wang3, Wei Zhang4, Yue Chen1, Jie Wang1. 1. Department of Fundamental and Community Nursing, School of Nursing, Nanjing Medical University, Nanjing, China. 2. Department of Epidemiology, School of Public Health, Nanjing Medical University, Nanjing, China. 3. Ninghai Road Community Health Service Center, Nanjing, China. 4. Department of Epidemiology, Shanghai Cancer Institute, Shanghai, China.
Abstract
INTRODUCTION: Vitamin D-binding protein (VDBP) is correlated with nonalcoholic fatty liver disease (NAFLD) through the biological functions of regulating plasma vitamin D (VD) level and the inflammatory process. OBJECTIVE: This study aims to investigate the effects of VD level and VDBP gene polymorphisms on the risk of NAFLD in a Chinese population. METHODS: Plasma 25-hydroxyvitamin D3 levels were measured and seven VDBP candidate genetic variants (rs222020, rs2282679, rs4588, rs1155563, rs7041, rs16847024, rs3733359) were genotyped among participants in this case-control study. The control group was frequency-matched to the NAFLD case group by age and gender. Correlation analysis and multiple linear regressions were used to screen determinants of 25-hydroxyvitamin D3 levels. Multivariable unconditional logistic regression was performed to estimate odds ratio (OR) and 95% confidence interval (95% CI). The prediction capability of models containing independent factors was estimated by the area under the receiver operating characteristic curve and Hosmer-Lemeshow test. RESULTS: Age, body mass index, and triacylglycerol were independent factors influencing VD levels. Participants with low VD levels had significantly higher prevalence of NAFLD compared to subjects with normal VD levels (p < 0.001). A low VD level contributed to increased the risk of NAFLD, independent of metabolic factors known to affect VD levels (adjusted OR = 2.282, 95% CI = 1.422-3.661, p = 0.001). Logistic regression analysis showed that individuals carrying rs7041-G allele had a significantly decreased the risk of NAFLD occurrence compared to T allele (additive model: adjusted OR = 0.814, 95% CI = 0.713-0.929, p = 0.002; codominant model: adjusted OR = 0.623, 95% CI = 0.449-0.866, p = 0.005), after adjusting for age, gender, and overweight. Stratification by multiple metabolic disorders did not alter this relationship. Moreover, we developed a simple model including age, gender, metabolic disorders, and VDBP single nucleotide polymorphism (SNP) to assess NAFLD risk, an AUC of which being 0.817, significantly higher than the model not included VDBP SNP, with Hosmer-Lemeshow test fitting well (p = 0.182). CONCLUSIONS: Low plasma VD levels may increase susceptibility to NAFLD, while rs7041-G allele in VDBP contributed to a decreased NAFLD risk among Chinese population. The VDBP variant significantly improved the capability for NAFLD risk assessment, which could be used for early screening and management of NAFLD.
INTRODUCTION: Vitamin D-binding protein (VDBP) is correlated with nonalcoholic fatty liver disease (NAFLD) through the biological functions of regulating plasma vitamin D (VD) level and the inflammatory process. OBJECTIVE: This study aims to investigate the effects of VD level and VDBP gene polymorphisms on the risk of NAFLD in a Chinese population. METHODS: Plasma 25-hydroxyvitamin D3 levels were measured and seven VDBP candidate genetic variants (rs222020, rs2282679, rs4588, rs1155563, rs7041, rs16847024, rs3733359) were genotyped among participants in this case-control study. The control group was frequency-matched to the NAFLD case group by age and gender. Correlation analysis and multiple linear regressions were used to screen determinants of 25-hydroxyvitamin D3 levels. Multivariable unconditional logistic regression was performed to estimate odds ratio (OR) and 95% confidence interval (95% CI). The prediction capability of models containing independent factors was estimated by the area under the receiver operating characteristic curve and Hosmer-Lemeshow test. RESULTS: Age, body mass index, and triacylglycerol were independent factors influencing VD levels. Participants with low VD levels had significantly higher prevalence of NAFLD compared to subjects with normal VD levels (p < 0.001). A low VD level contributed to increased the risk of NAFLD, independent of metabolic factors known to affect VD levels (adjusted OR = 2.282, 95% CI = 1.422-3.661, p = 0.001). Logistic regression analysis showed that individuals carrying rs7041-G allele had a significantly decreased the risk of NAFLD occurrence compared to T allele (additive model: adjusted OR = 0.814, 95% CI = 0.713-0.929, p = 0.002; codominant model: adjusted OR = 0.623, 95% CI = 0.449-0.866, p = 0.005), after adjusting for age, gender, and overweight. Stratification by multiple metabolic disorders did not alter this relationship. Moreover, we developed a simple model including age, gender, metabolic disorders, and VDBP single nucleotide polymorphism (SNP) to assess NAFLD risk, an AUC of which being 0.817, significantly higher than the model not included VDBP SNP, with Hosmer-Lemeshow test fitting well (p = 0.182). CONCLUSIONS: Low plasma VD levels may increase susceptibility to NAFLD, while rs7041-G allele in VDBP contributed to a decreased NAFLD risk among Chinese population. The VDBP variant significantly improved the capability for NAFLD risk assessment, which could be used for early screening and management of NAFLD.
Authors: James E Nelson; Christian L Roth; Laura A Wilson; Katherine P Yates; Bradley Aouizerat; Vicki Morgan-Stevenson; Elizabeth Whalen; Andrew Hoofnagle; Michael Mason; Vivian Gersuk; Matthew M Yeh; Kris V Kowdley Journal: Am J Gastroenterol Date: 2016-03-22 Impact factor: 10.864