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Erschienen in: BMC Endocrine Disorders 1/2021

Open Access 01.12.2021 | Research

IL-6 and IL-10 gene polymorphisms and cirrhosis of liver risk from a comprehensive analysis

verfasst von: Minghui Zheng, Weizhen Fang, Menglei Yu, Rui Ding, Hua Zeng, Yan Huang, Yuanyang Mi, Chaohui Duan

Erschienen in: BMC Endocrine Disorders | Ausgabe 1/2021

Abstract

Background

Different inflammatory and immune cytokines play a key role in the development of cirrhosis of liver (CL). To investigate the association between interleukin-6,10 (IL-6,10) genes polymorphisms and CL risk through comparison of the allele and genotype distribution frequencies by meta-analysis.

Methods

A literature search covered with the PubMed, Embase, Cochrane Library, Web of Science, Google Scholar, SinoMed (CNKI and Wanfang) through 20th April, 2021. Odds ratios (OR) and 95% confidence intervals (CI) were used to assess the strength of associations.

Results

After a comprehensive search, three common polymorphisms (rs1800872, rs1800871, rs1800896) in IL-10 gene were selected, and three common polymorphisms (rs1800795, rs1800796, rs1800797) in IL-6 gene were also identified. The important finding was that IL-10 rs1800872 was a risk factor for CL development. For example, there has a significantly increased relationship between rs1800872 polymorphism and CL both in the whole group (OR: 1.30, 95%CI: 1.01–1.67 in heterozygote model), Asian population (OR: 1.40, 95%CI: 1.03–1.88 in heterozygote model) and hospital-based source of control (OR: 1.40, 95%CI: 1.01–1.96 in dominant model). In addition, significant association was found between rs1800896 and primary biliary cirrhosis subtype disease (OR: 1.30, 95%CI: 1.01–1.68 in allelic contrast model). No association was observed in all three polymorphisms in IL-6 gene.

Conclusion

Our present study suggests that the IL-10 rs1800872 and rs1800896 polymorphisms is potentially associated with the risk of CL susceptibility.
Hinweise
Minghui Zheng, Weizhen Fang and Menglei Yu contributed equally to this work.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Abkürzungen
CL
cirrhosis of liver
LC
Liver cirrhosis
HWE
Hardy–Weinberg equilibrium
OR
Odds ratio
95%CI
95% Confidence interval
PBC
primary biliary cirrhosis
ALC
alcoholic liver cirrhosis

Background

Cirrhosis is characterized by extreme liver scarring (fibrosis), loss of organ function and serious complications related to portal hypertension (high blood pressure in the hepatic portal vein and its branches) [1].
Cirrhosis is the 11th leading cause of death worldwide, with a total burden of about 123 million deaths, of which about one tenth is decompensated [2, 3]. Liver cirrhosis (LC) is a severe public health problem worldwide, which is correlated with higher morbidity and mortality [4, 5]. The most common causes were chronic viral hepatitis [including infectious Hepatitis B virus (HBV, 39.64 million), and infectious Hepatitis C virus (HCV, 30.36 million)], alcoholic liver disease (26.04 million) and nonalcoholic fatty liver disease (NAFLD, 10.26 million), and other causes (16.62 million) [6]. With the implementation of HBV vaccination program and the application of effective anti HBV and HCV drugs in high endemic areas, the rate of liver cirrhosis caused by hepatitis gradually decreased, and the number of cases caused by NAFLD gradually increased [7]. NAFLD is now the commonest etiology worldwide, affecting 1 in 4 adults [8], and the progressive form that leads to patient with NAFLD, is predicted to increase by 63% between 2015 and 2030, representing a global cohort of at least 100 million individuals [9].
In the absence of effective intervention, cirrhosis can progress to decompensation, with ascites, gastrointestinal bleeding, hepatic encephalopathy, hepatorenal syndrome, and liver cancer [7]. Liver transplantation is the most effective therapeutic option for end-stage liver disease but is a scarce resource [1]. Moreover, although antifibrotic or pro-regenerative drug therapies for cirrhosis have been approved, they have been in clinical trials and the effect has not been determined [1].
Cytokines, such as interleukins, play an integral role in the host immune response and may be a critical factor in determining the duration and severity of virus infection, fibrosis formation [10, 11]. Interleukin-10 (IL-10) is an important anti-inflammatory cytokine secreted by different cells such as liver cells, T regulatory lymphocytes, activated macrophages, and T helper (Th) 2 cells [12]. It inhibits macrophage-dependent antigen presentation, proliferation of T-lymphocytes, and Th1 cytokine secretion and acts as an inhibitor of Th1 effectors mechanism [12]. Three common polymorphisms -1082G/A (rs1800896), − 819C/T (rs1800871), and − 592 C/A (rs1800872) related to cirrhosis of liver (CL) have been wildly reported [13]. IL-6, a primary immunomodulatory cytokine, has been documented to play a pivotal role in regulating the biological processes of many cells including hepatocytes [14]. Three common polymorphisms -174G/C (rs1800795), − 572G/C (rs1800796), and − 597 G/A (rs1800797) related to CL have been wildly reported [15].
In order to overcome the factors of sample size, regional and ethnic differences, our study summarized all published literatures related to the relationship between IL-6 and IL-10genes polymorphisms and CL by meta-analysis, to comprehensively evaluate the relationship between several polymorphisms and CL, and to provide evidence-based medical research basis for the etiology of CL.

Materials and methods

Literature search strategy

A computerized literature search was performed for relevant studies from PubMed, Embase, Cochrane Library, Web of Science, Google Scholar, SinoMed (CNKI and Wanfang) before 20th April, 2021. The following keywords were jointly used “interleukin 10 or interleukin 6 or IL-10 or IL-6”, “polymorphism or variation or mutation”, “rs1800795 or rs1800796 or rs1800797 or rs1800896 or rs1800871 or rs1800872” and “live cirrhosis or primary biliary cirrhosis or nonalcoholic fatty liver disease”. If studies applied the same case clinic information, only the largest sample size was selected [16].

Inclusion criteria

The included studies met the following criteria: (a) there were clear criteria for the diagnosis of CL, such as B-ultrasound, CT, MRI, endoscopic retrograde cholangiopancreatography, liver biopsy, and so on, (b) the correlation between CL risk and IL-10 and IL-6 genes polymorphisms (rs1800795 or rs1800796 or rs1800797 or rs1800896 or rs1800871 or rs1800872), (c) case-control or cohort design, (d) provided sufficient data for calculating odds ratio (OR) with 95% confidence interval (95%CI), and (e) duplicated studies with the same cases [17].

Data extraction

The following information was extracted from each included study: name of the first author, publication year, country of origin, ethnicity, numbers of cases and controls, HWE of control group, genotype method and sub-type of CL. The data were selected independently by 2 investigators who reached a consensus on all items [18].

Statistical analysis

The associations of the IL-10 and IL-6 genes polymorphisms and risk of CL were estimated by calculating the OR and 95%CI. The statistical significance of the OR was determined with the Z test [19]. The significance of the effect for correlation was determined by the Z test [18]. The heterogeneity among studies was evaluated using a Q test and I2 test as described in other studies [20, 21]. As a guide, I2 values of <25% may be considered ‘low’, value of ~ 50% may be considered ‘moderate’ and values of >75% may be considered ‘high’ [22]. The Mantel-Haenszel (fixed effect) model was chosen, otherwise, if Pheterogeneity < 0.1, the random effects (DerSimonian-Laird) model was applied [23, 24]. Sensitivity analysis was undertaken by removing each study once to assess whether any single study could influence the stability of results [25]. The departure of frequencies of six polymorphisms from expectation under HWE was assessed by the Pearson’s χ2 test, P < 0.05 was considered significant [26]. Begg’s funnel plots and Egger’s regression test were performed to estimate the potential publication bias [27]. All statistical tests for this meta-analysis were performed using version 10.0 Stata software (StataCorp LP, College Station, TX, USA) [18].

Network of protein-interaction of IL-6 and IL-10 gene

To more complete understanding of the role of IL-6 and IL-10 in CL, the network of gene-gene interactions for IL-6 and IL-10 was predicted through online String database (http://​string-db.​org/​) [28].

Results

Study searching and their basic information

As depicted in Fig. 1, 602 articles were garnered by PubMed, Embase, Cochrane Library, Web of Science, Google Scholar, SinoMed (CNKI and Wanfang (337 titles about IL-10 gene polymorphisms and 265 titles for IL-6 gene polymorphisms) database. 496 obviously irrelevant articles were excluded after screening the titles and abstract sections. The full texts were then evaluated, and 79 additional articles were further excluded as they were duplication (22), meta-analysis systematic analysis or review (42), other polymorphisms (5), clinical trial (8) and randomized controlled trial (2). Finally, 27 different articles [15, 2955] met the inclusion criteria and were included in our meta-analysis. Among these included studies, 19 studies were performed about IL-10 three polymorphisms (19 case-control studies for rs1800872, 12 for rs1800871, 18 for rs1800896), and 9 studies was related to IL-6 three polymorphisms (6 for rs1800795, 4 for 1,800,796 and 2 for rs1800797). All the included studies used blood samples for DNA extraction (Table 1). In addition, we checked the Minor Allele Frequency (MAF) reported for the six main worldwide populations in the 1000 Genomes Browser (https://​www.​ncbi.​nlm.​nih.​gov/​snp/​) (Fig. 2). The genotyping methods included polymerase chain reaction-restrictive fragment length polymorphism, sequencing, TaqMan, Sequenom Assay Design, amplification refractory mutation system and sequence specific primer.
Table 1
Characteristics of included studies about polymorphisms in IL-6 and IL-10 genes and cirrhosis of liver risk
Author
Year
Country
Ethnicity
Case
Control
SOC
HWE
Genotype
Sub-type
-592
rs1800872
       
Chen
2004
China
Asian
77
54
HB
0.633
PCR-RFLP
PBC
Zappala
1998
UK
Caucasian
171
141
HB
0.071
PCR
PBC
Matsushita
2002
USA
Caucasian
94
72
PB
0.501
PCR-RFLP
PBC
Matsushita
2002
USA
Caucasian
65
71
PB
< 0.01
PCR-RFLP
PBC
Marcos
2008
Spain
Caucasian
96
100
HB
0.093
PCR-RFLP
ALC
Yao
2015
China
Asian
318
318
PB
< 0.01
PCR-RFLP
LC
Barooah
2020
India
Asian
96
110
HB
0.009
PCR-RFLP
HCV-LC
Liu
2015
China
Asian
192
192
HB
< 0.01
Sequenom Assay Design
Mixed
Cao
2016
China
Asian
241
254
HB
< 0.01
PCR-RFLP
LC
Baghi
2015
Iran
Asian
9
102
PB
0.664
PCR-RFLP
HBV-LC
Cheong
2005
South Korea
Asian
79
261
HB
< 0.01
PCR
HBV-LC
Sheneef
2017
Egypt
African
50
50
PB
0.889
ARMS-PCR
HCV-LC
Corchado
2013
Korea
Asian
39
49
HB
0.187
PCR
HCV-LC
Fan
2004
China
Asian
77
160
HB
< 0.01
PCR-RFLP
PBC
Khalifa
2016
Saudi Arabia
Asian
109
110
HB
0.525
PCR-RFLP
HBV-LC
Moreira
2016
Brazil
Mixed
37
102
HB
0.316
PCR-SSP
HCV-LC
Wang
2010
China
Asian
50
42
HB
< 0.01
PCR
HBV-LC
Jiang
2009
China
Asian
169
119
HB
0.552
PCR-RFLP
HBV-LC
Wu
2010
China
Asian
50
96
HB
0.125
PCR-RFLP
HBV-LC
−819
rs1800871
       
Chen
2004
China
Asian
77
54
HB
1
PCR-RFLP
PBC
Matsushita
2002
USA
Caucasian
94
72
PB
0.501
PCR-RFLP
PBC
Matsushita
2002
USA
Caucasian
65
71
PB
0.049
PCR-RFLP
PBC
Yao
2015
China
Asian
318
318
PB
0.227
PCR-RFLP
LC
Barooah
2020
India
Asian
96
110
HB
0.474
PCR-RFLP
HCV-LC
Liu
2015
China
Asian
192
192
HB
0.073
Sequenom Assay Design
Mixed
Baghi
2015
Iran
Asian
9
102
PB
0.369
PCR-RFLP
HBV-LC
Cheong
2005
South Korea
Asian
79
261
HB
0.458
PCR
HBV-LC
Yang
2013
China
Asian
40
64
PB
0.821
ARMS-PCR
ALC
Fan
2004
China
Asian
77
160
HB
0.455
PCR-RFLP
PBC
Moreira
2016
Brazil
Mixed
37
102
HB
0.316
PCR-SSP
HCV-LC
Wang
2010
China
Asian
50
43
HB
0.017
PCR
HBV-LC
−1082
rs1800896
       
Chen
2004
China
Asian
77
54
HB
0.611
PCR-RFLP
PBC
Bathgate
2000
UK
Caucasian
61
330
HB
0.003
sequence
PBC
Matsushita
2002
USA
Caucasian
94
72
PB
0.859
PCR-RFLP
PBC
Matsushita
2002
USA
Caucasian
65
71
PB
0.568
PCR-RFLP
PBC
Abd El-Baky
2020
Egypt
African
22
48
PB
< 0.01
TaqMan real-time PCR
HCV-LC
Yao
2015
China
Asian
318
318
PB
0.898
PCR-RFLP
LC
Barooah
2020
India
Asian
96
110
HB
0.054
PCR-RFLP
HCV-LC
Liu
2015
China
Asian
266
532
HB
< 0.01
Sequenom Assay Design
Mixed
Cao
2016
China
Asian
241
254
PB
0.953
PCR-RFLP
LC
Baghi
2015
Iran
Asian
9
102
PB
0.047
PCR-RFLP
HBV-LC
Cheong
2005
South Korea
Asian
79
261
HB
0.769
PCR
HBV-LC
Yang
2013
China
Asian
40
64
PB
0.452
ARMS-PCR
ALC
Sheneef
2017
Egypt
African
50
50
PB
0.259
ARMS-PCR
HCV-LC
Fan
2004
China
Asian
77
160
HB
0.505
PCR-RFLP
PBC
Khalifa
2016
Saudi Arabia
Asian
109
110
HB
0.267
PCR-RFLP
HBV-LC
Moreira
2016
Brazil
Mixed
37
102
HB
0.973
PCR-SSP
HCV-LC
Wang
2010
China
Asian
50
42
HB
0.874
PCR
HBV-LC
Wu
2010
China
Asian
50
96
HB
0.629
PCR-RFLP
HBV-LC
-174G > C
         
Giannitrapani
2011
Italy
Caucasian
95
105
HB
0.776
PCR-RFLP
LC
Fan
2004
China
Asian
77
160
PB
< 0.01
SSP
PBC
Falleti
2008
Italy
Caucasian
219
236
PB
0.536
PCR-RFLP
Mixed
Marcos
2009
Spain
Caucasian
96
160
PB
0.333
TaqMan
ALC
Motawi
2016
Egypt
African
65
100
HB
< 0.01
PCR-RFLP
HCV-LC
Moreira
2016
Brazil
Mixed
38
100
HB
0.718
PCR-SSP
HCV-LC
IL6–572
         
Park
2003
Korea
Asian
696
280
PB
0.193
sequence
HBV-LC
Falleti
2008
Italy
Caucasian
219
236
PB
0.249
PCR-RFLP
Mixed
Saxenas
2014
India
Asian
63
83
HB
< 0.01
PCR-RFLP
HBV-LC
Tang
2013
China
Asian
153
265
HB
0.529
TaqMan
HBV-LC
597G > A
         
Falleti
2008
Italy
Caucasian
219
236
PB
0.348
PCR-RFLP
Mixed
Saxenas
2014
India
Asian
3
138
HB
0.613
PCR-RFLP
HBV-LC
HB: hospital-based; PB: population-based; SOC; source of control; PCR-RFLP: polymerase chain reaction followed by restriction fragment length polymorphism; SSP: sequence specific primer; ARMS: amplification refractory mutation system; HWE: Hardy-Weinberg equilibrium of control group; PBC: primary biliary cirrhosis; LC: liver cirrhosis; ALC: alcoholic liver cirrhosis, HCV: hepatitis C virus infection, HBV: hepatitis B virus infection

Quantitative synthesis

IL-10 − 592 polymorphism

In whole analysis, increased associations were observed in two genetic models (heterozygote comparison: OR: 1.30, 95%CI:1.01–1.67, P = 0.006 for heterogeneity, P = 0.039, I2 = 50.9%, Fig. 3A; dominant model: OR: 1.34, 95%CI:1.04–1.72, P = 0.001 for heterogeneity, P = 0.021, I2 = 57.5%). In subgroup analysis by ethnicity, based on different frequency of races, there also had increased associations between this polymorphism and CL in Asians not Caucasians in all models (allelic contrast: OR: 1.25, 95%CI:1.01–1.55, P = 0.000 for heterogeneity, P = 0.042, I2 = 72.3%; heterozygote comparison: OR: 1.40, 95%CI:1.03–1.88, P = 0.001 for heterogeneity, P = 0.029, I2 = 63.1%, Fig. 3A; dominant model: OR: 1.47, 95%CI:1.09–1.99, P = 0.000 for heterogeneity, P = 0.013, I2 = 68.3%). In addition, regular analysis by source of control, also significantly trend was found for this SNP in HB rather than PB studies (dominant model: OR: 1.40, 95%CI:1.01–1.96, P = 0.000 for heterogeneity, P = 0.046, I2 = 68.2%, Fig. 3B). Finally, many causes may result in cirrhosis, such as primary biliary cirrhosis (PBC), alcoholics with liver cirrhosis, HCV-LC, HBV-LC and immune cirrhosis, to our regret, no significant association was found in all kinds of this subgroup (Table 2).
Table 2
Stratified analyses of IL-6 and IL-10 genes’ common polymorphisms on cirrhosis of liver risk
Variables
N
Case/
Allelic contrast
Heterozygote comparison
Dominant model
  
Control
OR(95%CI) Ph P I-squared
OR(95%CI) Ph P I-squared
OR(95%CI) Ph P I-squared
IL-10 -592
     
Total
19
2019/2403
1.15 (0.98–1.37)0.000 0.093 65.7%
1.30 (1.01–1.67)0.006 0.03950.9%
1.34 (1.04–1.72)0.001 0.02157.5%
Ethnicity
     
Asian
13
1506/1867
1.25 (1.01–1.55)0.000 0.042 72.3%
1.40 (1.03–1.88)0.001 0.02963.1%
1.47 (1.09–1.99)0.000 0.01368.3%
Caucasian
4
426/384
0.98 (0.78–1.22)0.270 0.840 23.4%
1.26 (0.74–2.14)0.728 0.399 0.0%
1.24 (0.76–2.02)0.747 0.395 0.0%
SOC
     
HB
14
1483/1790
1.19 (0.95–1.48)0.000 0.125 73.6%
1.36 (0.98–1.89)0.001 0.06863.5%
1.40 (1.01–1.96)0.000 0.04668.2%
PB
5
536/613
1.11 (0.93–1.33)0.594 0.234 0.0%
1.17 (0.88–1.57)0.917 0.277 0.0%
1.19 (0.91–1.56)0.897 0.208 0.0%
Disease type
     
PBC
5
484/498
1.11 (0.91–1.35)0.590 0.319 0.0%
1.23 (0.85–1.78)0.908 0.281 0.0%
1.27 (0.89–1.79)0.871 0.184 0.0%
HBV-LC
6
466/730
1.46 (0.86–2.49)0.000 0.163 35.9%
2.24 (0.95–5.28)0.000 0.06584.0%
2.26 (0.95–5.38)0.000 0.06586.3%
HCV-LC
4
222/311
0.98 (0.75–1.28)0.161 0.901 41.8%
0.93 (0.53–1.64)0.531 0.794 0.0%
0.98 (0.59–1.62)0.572 0.926 0.0%
-819
     
Total
12
1134/1549
1.07 (0.88–1.30)0.017 0.485 52.4%
1.14 (0.86–1.51)0.072 0.35440.3%
1.15 (0.86–1.53)0.029 0.35448.8%
Ethnicity
     
Asian
9
938/1304
1.05 (0.82–1.34)0.006 0.089 63.0%
1.18 (0.86–1.64)0.047 0.30449.0%
1.17 (0.83–1.64)0.016 0.36757.2%
Caucasian
2
159/143
1.28 (0.90–1.83)0.790 0.173 0.0%
1.23 (0.64–2.34)0.542 0.537 0.0%
1.33 (0.74–2.39)0.493 0.334 0.0%
SOC
     
HB
7
608/922
1.14 (0.88–1.47)0.037 0.321 55.2%
1.22 (0.78–1.91)0.020 0.38660.2%
1.23 (0.80–1.91)0.016 0.34361.5%
PB
5
526/627
0.96 (0.68–1.36)0.045 0.832 58.9%
1.07 (0.81–1.42)0.543 0.614 0.0%
1.08 (0.83–1.40)0.229 0.556 28.8%
Disease type
     
PBC
4
313/357
1.24 (0.97–1.57)0.964 0.082 0.0%
1.37 (0.95–1.99)0.906 0.095 0.0%
1.38 (0.97–1.96)0.911 0.071 0.0%
HBV-LC
3
138/406
1.55 (0.55–4.43)0.004 0.409 81.6%
2.96 (0.70–12.47)0.0320.14070.8%
2.68 (0.67–10.74)0.0240.16573.2%
HCV-LC
2
133/212
0.92 (0.66–1.27)0.901 0.595 0.0%
0.65 (0.38–1.14)0.457 0.132 0.0%
0.71 (0.42–1.20)0.467 0.203 0.0%
-1082
     
Total
18
1741/2776
1.01 (0.85–1.20)0.013 0.892 47.5%
1.01 (0.82–1.23)0.202 0.941 21.2%
1.00 (0.80–1.24)0.053 0.971 37.9%
Ethnicity
     
Asian
12
1412/2103
0.94 (0.76–1.17)0.018 0.577 51.9%
1.01 (0.78–1.33)0.092 0.921 37.5%
0.96 (0.72–1.29)0.024 0.795 50.2%
Caucasian
3
220/473
1.25 (0.94–1.65)0.323 0.122 11.4%
1.20 (0.78–1.85)0.900 0.409 0.0%
1.30 (0.86–1.95)0.699 0.213 0.0%
African
2
72/98
1.27 (0.82–1.97)0.817 0.282 0.0%
1.12 (0.47–2.70)0.241 0.799 27.2%
1.24 (0.55–2.82)0.269 0.602 18.0%
SOC
     
HB
10
902/1797
1.04 (0.89–1.21)0.502 0.601 0.0%
1.11 (0.90–1.37)0.734 0.319 0.0%
1.09 (0.90–1.32)0.683 0.380 0.0%
PB
8
839/979
0.99 (0.72–1.36)0.005 0.966 65.8%
0.86 (0.56–1.33)0.087 0.505 43.7%
0.87 (0.53–1.42)0.016 0.577 59.3%
Disease type
     
PBC
5
374/687
1.30 (1.01–1.68)0.568 0.043 0.0%
1.32 (0.93–1.89)0.901 0.122 0.0%
1.39 (0.98–1.95)0.863 0.061 0.0%
HBV-LC
5
297/611
0.97 (0.71–1.32)0.318 0.827 15.2%
1.30 (0.89–1.90)0.527 0.170 0.0%
1.15 (0.80–1.67)0.420 0.447 0.0%
HCV-LC
4
205/310
0.98 (0.76–1.28)0.547 0.897 0.0%
0.81 (0.53–1.24)0.865 0.332 0.0%
0.85 (0.58–1.26)0.489 0.414 0.0%
LC
2
559/572
0.72 (0.60–0.85)0.987 0.000 0.0%
0.64 (0.44–0.93)0.865 0.019 0.0%
0.56 (0.39–0.80)0.892 0.001 0.0%
IL-6 -174
     
Total
6
590/861
1.17 (0.73–1.86)0.002 0.511 77.5%
1.42 (0.70–2.87)0.000 0.330 78.3%
1.37 (0.71–2.63)0.001 0.346 77.2%
Ethnicity
     
Caucasian
3
410/501
0.89 (0.73–1.09)0.631 0.244 0.0%
0.87 (0.65–1.15)0.314 0.316 13.7%
0.86 (0.66–1.12)0.550 0.257 0.0%
SOC
     
HB
3
198/305
1.98 (0.55–7.05)0.001 0.294 86.8%
2.79 (0.41–18.88)0.000 0.294 90.4%
2.71 (0.47–15.57)0.0000.26589.6%
PB
3
392/556
0.99 (0.63–1.55)0.083 0.961 59.8%
1.04 (0.76–1.42)0.130 0.800 50.9%
0.98 (0.73–1.32)0.110 0.916 54.7%
−572
     
Total
4
1131/864
1.15 (0.97–1.36)0.859 0.117 0.0%
2.23 (0.80–6.21)0.000 0.127 89.2%
1.60 (0.83–3.06)0.005 0.157 76.3%
−597
     
Total
2
280/374
0.84 (0.66–1.08)0.453 0.168 0.0%
0.88 (0.63–1.23)0.203 0.462 38.3%
0.84 (0.61–1.15)0.278 0.283 15.0%
Ph: value of Q-test for heterogeneity test; P: Z-test for the statistical significance of the OR

IL-10 -1082 polymorphism

No association was detected in total, ethnicity, source of control subgroups, however, in the subgroup of disease type subgroup, increased relationship was observed in the allelic contrast model (OR: 1.30, 95%CI:1.01–1.68, P = 0.568 for heterogeneity, P = 0.043, I2 = 0.0%) (Fig. 4A). In the sub-type of CL, we found decreased association was existed in LC risk and this polymorphism (such as OR: 0.64, 95%CI:0.44–0.93, P = 0.865 for heterogeneity, P = 0.019, I2 = 0.0%, Fig. 4B).

IL-10-819, IL-6 -174, − 572 and − 597 polymorphisms

No association was found in above four kinds of polymorphisms (data not shown) (Table 2).

Bias diagnosis for publication and sensitivity analysis

The publication bias was evaluated by both Begg’s funnel plot and Egger’s test (such as − 592 polymorphism). At beginning, the shape of the funnel plots seemed asymmetrical in allele comparison for − 592 by Begg’s test, suggesting no publication bias was existed. Then, Egger’s test was applied to provide statistical evidence of funnel plot symmetry. As a result, no obvious evidence of publication bias was observed (such as allelic contrast: t = 2.57, P = 0.024 for Egger’s test; z = 1.75, P = 0.08 for Begg’s test (Fig. 5 A, B) (Table 3).
Table 3
Publication bias tests (Begg’s funnel plot and Egger’s test for publication bias test) for IL-10 -592 polymorphism
Egger’s test
     
Begg’s test
 
Genetic type
Coefficient
Standard error
t
P value
95%CI of intercept
z
P value
C-allele vs. A-allele
−0.181
1.211
−0.15
0.883
(−2.736–2.374)
1.26
0.208
CA vs. AA
−0.047
0.447
−0.11
0.917
(−0.992–0.897)
0.35
0.726
CC + CA vs. AA
−0.047
0.51
−0.09
0.927
(−1.124–1.029)
0.56
0.576
To delete studies which may influence the power and stability of whole study, we applied the sensitive analysis (such as − 592 polymorphism), finally, no sensitive case-control studies were found for − 592 SNP in three models (Fig. 5C).

Gene-gene network diagram and interaction of online website

String online server indicated that IL-10 and IL-6 gene interacts with numerous genes. The network of gene-gene interaction has been illustrated in Fig. 6.

Discussion

Cirrhosis is the final stage of liver fibrosis, which itself results from a perpetuated wound-healing process after a liver injury that can lead to a wide range of chronic diseases involving the liver [56, 57]. In addition, cirrhosis is a burden on the individual and on public health. To our knowledge, the most prevalent chronic liver diseases are chronic viral hepatitis (from hepatitis B or C infection), alcohol-related liver disease, and NAFLD [56].
Cirrhosis negatively impacts on patient reported outcomes and health-related quality of life [5860]. The impact of cirrhosis on quality of life can add to the existing impairment of quality of life related to viraemia in patients with hepatitis C [61, 62]. Conversely, effective treatment of hepatitis C can lead to significant gains in patients’ quality of life, especially for patients with decompensated cirrhosis. In addition, there is evolving evidence indicating that quality of life is significantly impaired in patients with NAFLD in the form of non-alcoholic steatohepatitis [63]. Nowadays, the trends indicate that the contribution from NAFLD related cirrhosis is increasing within cirrhosis. Other risk factors, such as substantial regional variation, and substantial variation in time trends in the prevalence of these etiology, should also been paid attention.
We devoted to find some susceptible factors, finally, we focused on two cytokines (IL-6 and IL-10). So far, multiple genes have been shown to be associated with increased liver disease risk, such as CTLA-4, IL-18, transmembrane 6 superfamily member 2 and GSTM1 [6466]. Besides, more and more studies have indicated IL-6 and IL-10 polymorphisms may be associated with CL risk. Due to the limited number of samples about each study, the conclusion for every study may not be credible. Yao et al. found that IL-10 rs1800896 polymorphism was correlated with an increased risk of CL, especially in individuals with chronic hepatitis B [46]. Falleti et al. polymorphisms of IL-6 were associated with hepatocellular carcinoma (HCC) occurrence among patients with CL [34]. It is necessary to combine all previous studies and increase the sample size, we wish to obtain comprehensive and convince conclusions between IL-6 or IL-10 polymorphism and CL susceptibility.
It is in time to analyze the association between IL-6 and IL-10 polymorphisms and CL risk using meta-analysis method. After our searching through main database, 19 different case-control studies were identified for IL-10 polymorphism, and 9 case-control studies were detected for IL-6 polymorphism. The main results about current study are that IL-10 -592 polymorphism was a risk factor for CL risk in the whole samples, especially in Asian population, moreover, IL-10 − 1082 polymorphism had an increased association for PBC, which may offer references for early detection, prevention and treatment about CL. No positive results were observed in other polymorphisms, which due to the sample size and publication bias.
We all know the development and outcome about CL is complex and multi-factorial. Focusing on only each gene or each polymorphism is limited. Hence, we try our best to detect other potential genes related with CL based on online String server. Other nine most possible genes and current two related genes were shown in the network. Among them, six genes belong to cytokine family, and these scores were all in the front, the first related genes are IL-10RA, which is the receptor of IL-10 gene. Hennig et al. indicated IL-10RA gene polymorphisms may play a modulatory role in the outcome (including severity of fibrosis and overall inflammation) of hepatitis C infection [67]. Galal et al. confirmed that TNF family lymphotoxin-alpha GG genotype and low platelet count were independent predictors for HCC development in patients with HCV-LC [68]. Amirpour-Rostami et al. summarized the main correlation between the polymorphisms within IL-18 and IL-1B genes and chronic hepatitis B [69]. In a word, we should deep explore these partners of IL-10 and 6 genes, and gene-gene interactions in the development and treatment for CL in the next step.
There are some limitations should be paid attention. At the beginning, further studies should focus on Mixed and African populations, which was vacant in current analysis and need many more studies. Second, because CL is a multi-factors disease, gene-gene and gene-environment interactions should be considered and brought in. It is possible that specific environmental and lifestyle factors influence the associations between IL-10 and IL-6 polymorphism and CL, including age, sex, diet, smoking, familial history, parasite history, virus and immune factors. Third, whether the CL patients within other complications, such as abnormal liver function, HCC and hepatitis, all the included factors have not been reported. Further comprehensive studies should include above items. Fourth, the stage of CL is not distinguished, which should be analyzed separately (compensatory and decompensated period) and can be more accurate for prediction and treatment.

Conclusions

Our present meta-analysis suggests that IL-10 -592 and − 1082 polymorphisms may be associated with CL risk, which may be proofed in following larger and comprehensive studies.

Acknowledgements

Not applicable.

Availability of data and material

All data generated or analyzed in this study are included in this published article and its supplementary information files.

Declarations

Not applicable.
Not applicable.

Competing interests

The authors proclaim that they have no competing interests.
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Metadaten
Titel
IL-6 and IL-10 gene polymorphisms and cirrhosis of liver risk from a comprehensive analysis
verfasst von
Minghui Zheng
Weizhen Fang
Menglei Yu
Rui Ding
Hua Zeng
Yan Huang
Yuanyang Mi
Chaohui Duan
Publikationsdatum
01.12.2021
Verlag
BioMed Central
Erschienen in
BMC Endocrine Disorders / Ausgabe 1/2021
Elektronische ISSN: 1472-6823
DOI
https://doi.org/10.1186/s12902-021-00906-3

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