Risk factors of nonalcoholic fatty liver disease with a normal visceral adipose tissue area

Huang ZhiPeng; Jiang JianJia; Huang ZiCheng; Guo GuiYuan; Zhou APei; Liu XiaoQiang

doi:10.3969/j.issn.1001-5256.2019.05.025

Volume 35 Issue 5

May 2019

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Risk factors of nonalcoholic fatty liver disease with a normal visceral adipose tissue area

DOI: 10.3969/j.issn.1001-5256.2019.05.025

Department of Gastroenterology, Quanzhou First Hospital Affiliated to Fujian Medical University

Research funding:

Received Date: 2018-10-15
Published Date: 2019-05-20

Abstract

Abstract

Objective To investigate the risk factors and insulin resistance ( IR) of nonalcoholic fatty liver disease ( NAFLD) with a normal visceral adipose tissue ( VAT) area. Methods A total of 45 NAFLD persons with a normal VAT area who were admitted to Quanzhou First Hospital Affiliated to Fujian Medical University from June 2017 to May 2018 were enrolled as observation group, and 27 non-NAFLD patients with a normal VAT area were enrolled as control group. VAT area, waist circumference, fasting blood glucose ( FBG) , and fasting insulin ( FINS) were measured for both groups, homeostasis model assessment of insulin resistance ( HOMA-IR) was calculated, and the correlation of IR with the indices including waist circumference was analyzed. The independent samples t-test was used for comparison of normally distributed continuous data between two groups, and the Mann-Whitney U test was used for comparison of non-normally distributed continuous data between two groups; the chi-square test was used for comparison of categorical data between groups. Pearson correlation analysis and Spearman correlation analysis were used to investigate the correlation of normally and non-normally distributed continuous data. A forward logistic regression analysis was used to identify related risk factors. Results The NAFLD group had a significantly higher level of IR than the control group, and there was a significant difference in HOMA-IR between the two groups ( 2. 66 ( 1. 59-4. 06) vs 1. 84 ( 1. 25-2. 47) , Z = 364. 000, P = 0. 005) . IR was positively correlated with FBG ( r = 0. 412, P = 0. 005) , FINS ( r = 0. 789, P <0. 001) , and TG ( r = 0. 306, P = 0. 041) . IR was negatively correlated with HDL ( r =-9. 398, P = 0. 007) . The multivariate regression analysis showed that waist circumference was an independent risk factor for NAFLD with a normal VAT area ( regression coefficient = 0. 181, odds ratio = 1. 198, 95% confidence interval: 1. 099-1. 306, P < 0. 001) . Conclusion There is a certain degree of IR in NAFLD patients with a normal VAT, and waist circumference is an independent risk for NAFLD with a normal VAT.
- non-alcoholic fatty liver disease,
- intra-abdominal fat,
- risk factors

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肝细胞癌(HCC)是我国最常见的恶性肿瘤之一。国家癌症中心最新数据显示，我国每年新发肝癌约37万人，约32.6万人死于肝癌，其中94.7%与慢性HBV感染有关^[1-2]。早期发现、早期诊断和早期治疗是改善原发性肝癌预后的关键。然而目前尚缺乏原发性肝癌高敏感度和高特异度的诊断指标。自噬是细胞自我吞噬胞内长寿蛋白或受损细胞器并通过溶酶体途径进行的分解代谢过程，从而维持细胞稳态^[3]。近年研究^[4-7]显示自噬在HBV感染和HCC的发生发展起重要作用。但目前关于自噬相关蛋白在HBV相关HCC(HBV-HCC)患者血清中的表达及意义鲜有报道。本研究通过分析HBV-HCC、非HBV相关HCC(nonHBV-HCC)、慢性乙型肝炎(CHB)和健康对照者血清自噬相关蛋白7(ATG7)的表达水平，探讨ATG7对HBV-HCC的诊断价值。

1. 资料与方法

1.1 研究对象

选取2018年6月—2020年12月于本院住院的HCC患者89例。HCC的诊断标准符合《原发性肝癌诊疗规范(2017年版)》^[8]并经病理确认。排除标准如下：病理类型为肝内胆管癌或HCC-肝内胆管癌混合型者；已接受过肝移植术、局部消融、肝动脉化疗栓塞术、放化疗等抗肿瘤治疗者；继发性HCC患者；同时伴有其他肿瘤患者。CHB诊断符合《慢性乙型肝炎防治指南(2019年版)》^[9]。根据血清是否检出HBsAg和/或HBV DNA分为HBV-HCC组及nonHBV-HCC组。选取同期50例CHB患者(CHB组)和20例健康体检者作为对照组(HC组)。

1.2 资料收集

收集研究对象性别和年龄，总蛋白(TP)、白蛋白(Alb)、TBil、DBil、ALT、AST、GGT和ALP等实验室指标。另收集HBV-HCC组患者的BCLC分期和肿瘤直径等病理资料。

1.3 血清ATG7检测

所有研究对象清晨空腹肘静脉采血，采血后1 h内送实验室，3000 r/min离心10 min分离血清，-80 ℃冰箱保存。ATG7检测前4 h室温下复溶。使用上海江莱生物技术有限公司人ATG7酶联免疫吸附测定试剂盒(批号：Aug 2020)进行检测，严格按试剂盒说明书操作，在加入终止液15 min内用PHOMO酶标仪(安图生物，合肥)在450 nm波长测定各孔光密度(OD值)，用WPS表格以标准品的浓度为纵坐标，OD值为横坐标绘制标准曲线并取得多项式公式，根据多项式公式计算每个样本的ATG7浓度。

1.4 伦理学审查

本研究方案经由福建医科大学孟超肝胆医院伦理委员会审批，批号：科审2020-029-01。

1.5 统计学方法

采用SPSS 22.0进行统计分析。非正态分布的计量资料以M(P₂₅~P₇₅)表示，多组间比较采用Kruskal-Wallis H检验，2组间比较采用Mann-Whitney U检验；计数资料组间比较采用χ²检验；采用Spearman进行相关性分析。运用GraphPad Prism7.0绘制散点图，采用Medcalc18.11.3绘制受试者工作特征曲线(ROC曲线)并比较不同指标曲线下面积(AUC)。P＜0.05为差异有统计学意义。

2. 结果

2.1 一般资料

HCC、CHB及HC 3组比较，男女比例差异无统计学意义，其余指标差异均有统计学意义(P值均＜0.01)(表 1)。89例HCC患者中，67例(75.28%)血清HBsAg和/或HBV DNA阳性，纳入HBV-HCC组；剩余22例(24.72%)纳入nonHBV-HCC组，包括5例酒精性肝硬化，8例非酒精性脂肪肝，1例慢性丙型肝炎，2例肝硬化(病因未明)，6例慢性肝炎(病因未明)。HBV-HCC组血清TBil水平及具有肝硬化背景病例数高于nonHBV-HCC组，而nonHBV-HCC组的血清AST水平和最大肿瘤直径高于HBV-HCC组，差异均有统计学意义(P值均＜0.05)，其余参数差异均无统计学意义(P值均＞0.05)(表 2)。

表 1 3组人口学和实验室特征比较

参数	HCC组(n=89)	CHB组(n=50)	HC组(n=20)	χ²值	P值
年龄(岁)	56.0(48.0~66.5)	42.0(32.8~52.5)	37.5(30.0~48.8)	38.807	＜0.001
男性[例(%)]	77(86.52)	38(76.00)	13(65.00)	5.480	0.076
TBil(μmol/L)	19.30(12.65~26.10)	19.55(12.78~29.28)	12.15(9.48~18.63)	10.478	0.005
DBil(μmol/L)	7.60(4.70~10.85)	4.45(2.20~7.05)	5.30(4.15~6.35)	17.168	＜0.001
TP(g/L)	61.0(54.5~67.5)	66.5(60.8~73.3)	72.0(70.0~77.0)	34.168	＜0.001
Alb(g/L)	34.0(31.0~38.5)	37.5(34.0~41.0)	44.0(41.0~47.0)	42.516	＜0.001
ALT(U/L)	115.0(62.0~218.5)	87.5(26.5~206.8)	19.0(12.3~26.5)	37.212	＜0.001
AST(U/L)	149.0(54.0~286.0)	57.0(31.5~110.5)	17.0(14.3~20.0)	54.345	＜0.001
GGT(U/L)	52.0(34.0~110.5)	68.5(29.3~112.0)	17.0(14.3~24.5)	31.527	＜0.001
ALP(U/L)	81.0(60.5~103.0)	102.0(82.5~117.0)	66.5(52.8~88.3)	21.160	＜0.001
AFP(ng/mL)	37.90(5.00~712.32)	7.20(3.05~241.27)	2.85(2.18~4.48)	33.048	＜0.001
ATG7(ng/mL)	21.11(17.76~22.73)	19.21(16.65~20.82)	13.82(8.70~17.82)	33.134	＜0.001

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表 2 HBV-HCC组与nonHBV-HCC组生化和病理特征比较

参数	HBV-HCC组(n=67)	nonHBV-HCC组(n=22)	统计值	P值
年龄(岁)	55.0(46.0~ 65.0)	63.5(50.8~71.8)	U=535.000	0.055
男/女(例)	58/9	19/3	χ²=0.001	0.981
TBil(μmol/L)	20.60(13.30~27.40)	16.00(11.15~21.48)	U=524.500	0.043
DBil(μmol/L)	7.70(4.80~10.90)	7.15(3.80~9.65)	U=602.500	0.201
TP(g/L)	61.0(50.0~67.0)	58.5(51.3~68.3)	U=638.500	0.348
Alb(g/L)	34.0(31.0~38.0)	33.0(30.3~39.0)	U=709.500	0.793
ALT(U/L)	95.0(54.0~198.0)	152.0(89.8~268.0)	U=557.000	0.087
AST(U/L)	136.0(37.0~240.0)	236.5(93.8~348.8)	U=523.000	0.042
GGT(U/L)	51.0(30.0~111.0)	58.0(35.0~113.3)	U=658.000	0.452
ALP(U/L)	76.0(60.0~99.0)	92.0(62.8~127.8)	U=575.500	0.124
AFP(ng/mL)	58.00(7.10~945.80)	18.28(2.48~405.33)	U=536.500	0.057
BCLC(A/B/C/D，例)	51/4/12/0	12/5/5/0	χ²=5.229	0.073
最大肿瘤直径(cm)	3.95(2.50~7.70)	8.00(3.70~11.00)	U=520.000	0.047
肝硬化[例(%)]	55(82.09)	9(40.91)	χ²=13.904	＜0.001

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2.2 HBV-HCC血清ATG7表达水平升高

HBV- HCC组、nonHBV-HCC组、CHB组和HC组血清ATG7水平分别为22.88(19.79~23.04)ng/mL、17.06(14.45~19.40)ng/mL、19.21(16.65~20.82)ng/mL和13.82(8.70~17.82)ng/mL，差异有统计学意义(χ²=65.144，P＜0.001)。两两比较显示HBV-HCC组血清ATG7不仅高于CHB组(U=758.5，P＜0.001)和HC组(U=94.0，P＜0.001)，也高于nonHBV-HCC组(U=142.0，P＜0.001)；而nonHBV-HCC组血清ATG7水平不仅低于HBV-HCC组，也低于CHB组(U=311.0，P=0.003)，仅稍高于HC组(U=142.0，P=0.049)(图 1)。此外，在67例HBV-HCC患者中，有肝硬化背景和无肝硬化背景患者的血清ATG7水平分别为22.32 (19.79~22.99)ng/mL和20.89(19.40~23.37)ng/mL，差异无统计学意义(P＞0.05)。

图 1 4组血清ATG7表达水平比较

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2.3 血清ATG7表达水平和血清AFP水平的相关性

Spearman相关性分析显示，血清ATG7表达水平和血清AFP水平呈正相关，但相关性较弱(r=0.354，95%CI：0.205~0.486，P＜0.001)(图 2)。

图 2 血清ATG7和AFP相关性分析

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2.4 ATG7在HBV-HCC中的诊断性能

ROC曲线分析显示，ATG7诊断HBV-HCC的AUC为0.818(95% CI：0.743~0.879)，稍高于AFP(AUC=0.777，95%CI：0.698~0.843)，但二者差异无统计学意义(Z=0.852，P=0.394)(图 3)；ATG7诊断HBV-HCC的cut-off值为20.08 ng/mL，敏感度和特异度分别为71.64%和77.14%，均略高于AFP(68.66%和74.29%)。ATG7联合AFP的二元logistic回归预测概率的AUC为0.859 (95%CI：0.790~0.913)，显著高于ATG7(Z=2.192，P=0.028)和AFP(Z=2.076，P=0.038)(图 3, 表 3)。

图 3 ATG7、AFP及二者联合检测的ROC曲线

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表 3 ATG7、AFP及其联合检测诊断HBV-HCC的性能

项目	AUC	cut-off值	敏感度(%)	特异度(%)	阳性预测值(%)	阴性预测值(%)
AFP	0.777	12.20 ng/mL	68.66	74.29	71.9	71.2
ATG7	0.818	20.08 ng/mL	71.64	77.14	75.0	74.0
ATG7+AFP	0.859	0.56	74.63	88.57	86.2	78.5

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3. 讨论

本研究通过ELISA技术检测HCC患者血清ATG7表达水平，结果显示HBV-HCC患者血清ATG7显著升高，血清ATG7是诊断HBV-HCC的良好标志物，ATG7与AFP联合诊断可显著提高HBV-HCC的诊断效率。

ATG7作为一种泛素样修饰物激活酶，通过激活ATG8和ATG12调节自噬体的延伸，是自噬体形成过程的关键蛋白之一^[10]。近年研究^[11-12]提示ATG7及自噬在HBV-HCC发生发展中发挥重要作用。首先，HBV感染或HBV病毒蛋白的表达可诱导ATG7表达及自噬反应。本研究中CHB组血清ATG7显著高于健康对照组，印证了自噬与HBV感染有关。其次，多项研究^[13-14]显示包括ATG7在内的多种自噬相关蛋白在HCC组织表达显著提高。近年的分子细胞学试验进一步揭示多种分子可通过ATG7调节自噬促进HCC发生发展^[15-17]。研究^[15]显示长链非编码RNA HOX转录反义RNA(HOTAIR)可通过上调ATG7表达激活自噬促进HCC细胞系增殖。癌性锚蛋白重复序列可直接与胞质中的ATG7蛋白相互作用诱导自噬从而促进HCC细胞进展^[16]。肿瘤坏死因子α诱导蛋白8(TNFAIP8)则通过与ATG3-ATG7复合物相互作用调节自噬促进HCC细胞增殖^[17]。相反，靶向敲减ATG7可抑制自噬，从而促进细胞凋亡、延缓细胞周期及抑制HCC细胞增殖^[13]。上述研究结果表明ATG7与HBV-HCC密切相关。本研究数据显示HBV-HCC患者血清ATG7显著高于CHB和健康对照组，进一步证实了自噬与HBV-HCC的相关性，提示血清ATG7是一种潜在HBV-HCC标志物。而且HBV-HCC患者血清ATG7也显著高于nonHBV-HCC，提示不同病因的HCC发病机制不同，其血清标志物也可不同。

虽然AFP已在临床应用数十年，但诊断敏感度不高。最近的一项系统综述^[18]显示，AFP诊断HCC的合并敏感度仅为63.9%。与此相符，本研究中AFP诊断HBV-HCC的敏感度、特异度和AUC分别为68.66%、74.29%和0.777。虽然ATG7的敏感度与AFP相仿，但其特异度较高，总体诊断性能较好。此外，ATG7和AFP相关性较弱，提示二者联合检测可有效提高诊断性能。早前有学者^[19]提出应用logistic回归分析有助于提高多指标联合诊断效率。本研究结果显示ATG7联合AFP的二元logistic回归预测模型对HBV-HCC的整体诊断性能较好，AUC及诊断敏感度和特异度均显著高于ATG7及AFP。

总之，本研究显示ATG7是HBV-HCC的良好标志物，与AFP有较好的互补性，二者联合检测可显著提高HBV-HCC的诊断效率。然而本研究为单中心横断面研究，纳入研究病例有限，因此其诊断性能仍有待进一步扩大样本的多中心临床验证。

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Risk factors of nonalcoholic fatty liver disease with a normal visceral adipose tissue area

DOI: 10.3969/j.issn.1001-5256.2019.05.025