- Open Access
IL-6 and IL-10 gene polymorphisms and cirrhosis of liver risk from a comprehensive analysis
BMC Endocrine Disorders volume 21, Article number: 242 (2021)
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.
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.
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.
Our present study suggests that the IL-10 rs1800872 and rs1800896 polymorphisms is potentially associated with the risk of CL susceptibility.
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) .
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) . 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 . NAFLD is now the commonest etiology worldwide, affecting 1 in 4 adults , 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 .
In the absence of effective intervention, cirrhosis can progress to decompensation, with ascites, gastrointestinal bleeding, hepatic encephalopathy, hepatorenal syndrome, and liver cancer . Liver transplantation is the most effective therapeutic option for end-stage liver disease but is a scarce resource . 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 .
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 . It inhibits macrophage-dependent antigen presentation, proliferation of T-lymphocytes, and Th1 cytokine secretion and acts as an inhibitor of Th1 effectors mechanism . Three common polymorphisms -1082G/A (rs1800896), − 819C/T (rs1800871), and − 592 C/A (rs1800872) related to cirrhosis of liver (CL) have been wildly reported . IL-6, a primary immunomodulatory cytokine, has been documented to play a pivotal role in regulating the biological processes of many cells including hepatocytes . Three common polymorphisms -174G/C (rs1800795), − 572G/C (rs1800796), and − 597 G/A (rs1800797) related to CL have been wildly reported .
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 .
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 .
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 .
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 . The significance of the effect for correlation was determined by the Z test . 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’ . 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 . 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 . Begg’s funnel plots and Egger’s regression test were performed to estimate the potential publication bias . All statistical tests for this meta-analysis were performed using version 10.0 Stata software (StataCorp LP, College Station, TX, USA) .
Network of protein-interaction of IL-6 and IL-10 gene
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, 29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55] 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.
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).
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).
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.
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 .
Cirrhosis negatively impacts on patient reported outcomes and health-related quality of life [58,59,60]. 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 . 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 [64,65,66]. 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 . Falleti et al. polymorphisms of IL-6 were associated with hepatocellular carcinoma (HCC) occurrence among patients with CL . 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 . 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 . Amirpour-Rostami et al. summarized the main correlation between the polymorphisms within IL-18 and IL-1B genes and chronic hepatitis B . 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.
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.
cirrhosis of liver
95% Confidence interval
primary biliary cirrhosis
alcoholic liver cirrhosis
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This work was supported by Guangdong Basic and Applied Basic Research Foundation, China (2019A1515011646), National Natural Science Foundation of China (81401689), Guangzhou Science and Technology Plan Project (202102080298), Yat-sen Sailing Research Funds of Sun Yat-sen Memorial Hospital of Sun Yat-sen University, China (YXQH202004) and Guangdong Basic and Applied Basic Research Foundation, China (2019A1515011646, 2016A020219004). The authors have no conflicts of interest to declare in relation to this article.
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Zheng, M., Fang, W., Yu, M. et al. IL-6 and IL-10 gene polymorphisms and cirrhosis of liver risk from a comprehensive analysis. BMC Endocr Disord 21, 242 (2021). https://doi.org/10.1186/s12902-021-00906-3
- Cirrhosis of liver