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Association between the MCP-1 -2518 A > G (rs1024611) polymorphism and susceptibility to type 2 diabetes mellitus and diabetic nephropathy: a meta-analysis

BMC Endocrine Disorders volume 23, Article number: 267 (2023) Cite this article

Abstract

Background

Studies evaluating the association between monocyte chemoattractant protein-1 (MCP-1) -2518 A > G (rs1024611) polymorphism and type 2 diabetes mellitus (T2DM) and diabetic nephropathy (DN) are contradictory. The present study aims to provide a comprehensive assessment and more reliable estimation of the relationship between the MCP-1 rs1024611 polymorphism and T2DM and DN risk.

Methods

Eligible articles were retrieved from the PubMed, Web of Science, EMBASE, Cochrane, and China National Knowledge Infrastructure databases. The effect summary odds ratios (ORs) and 95% confidence intervals (CIs) were obtained to calculate the summary effect size. Heterogeneity was analyzed by subgroup analysis and meta-regression. Publication bias was tested using funnel plots and Egger’s test.

Results

In total, sixteen studies were included. Thirteen studies involving 2,363 patients with T2DM and 4,650 healthy controls found no significant association between the MCP-1 rs1024611 polymorphism and T2DM in the overall population. Ethnicity stratification found an association between the GG + GA genotype and decreased T2DM risk in Caucasians (OR = 0.79, 95% CI: 0.66–0.93, P = 0.006; PQ = 0.372). No significant risks were found in the Asian population for any genetic models. Seven studies found an association between the GG + GA genotype and DN risk in the Asian population (OR = 1.37, 95% CI: 1.11–1.71, P = 0.004, PQ = 0.222). No significant risks were found in the Caucasian population with any genetic models. There were no statistically significant differences in genotype distribution between patients with T2DM and DN in Asians or Caucasians. Meta-regression revealed that genotyping method was a major driver of heterogeneity in five genetic models (GG + GA vs. AA: P = 0.032; GG vs. GA + AA: P = 0.028; GG vs. AA: P = 0.035; GG vs. GA: P = 0.041; G vs. A: P = 0.041).

Conclusion

The MCP-1 rs1024611 polymorphism is associated with susceptibility to T2DM in Caucasians and DN in Asians. Larger, well-designed cohort studies are needed in the future to verify this association.

Peer Review reports

Background

Type 2 diabetes mellitus (T2DM) is a major global health problem and its global prevalence is increasing annually [1]. Approximately 536.6 million people (global prevalence: 10.5%) aged 20–79 years lived with DM in 2021, which was projected to rise to 783.2 million (global prevalence: 12.2%) by 2045 [2]. Microangiopathy is a specific pathology of T2DM, including diabetic nephropathy (DN), diabetic neuropathy, and diabetic retinopathy. DN, as a gradually developing kidney disease, is a critical chronic complication of T2DM and the main cause of end-stage renal disease [3]. DN can be difficult to reverse, thus causing cardiovascular and cerebrovascular disease and presenting an enormous economic burden to society. Given the progression of diabetes and the lack of a clear cure, elucidation of the molecular mechanisms of T2DM and DN is urgently needed to prevent and treat diabetes.

The etiology and pathogenesis of T2DM and DN have not been fully elucidated. Recently, the theory of inflammatory injury has received much attention. Evidence from many clinical and experimental studies shows that T2DM and DN are natural, immune, chronic, low-grade, inflammatory diseases [4,5,6]. Monocyte chemoattractant protein-1 (MCP-1) is an important chemokine that participates in inflammatory process regulation by activating monocytes and macrophage accumulation in damaged tissues [7]. Several studies have shown that MCP-1 plays a crucial role in inflammatory and immune diseases [8, 9]. An early study showed that serum MCP-1 levels were positively correlated with urinary albumin excretion and the degree of renal damage [10]. These studies suggest that MCP-1 is involved in glomerular injury and T2DM and DN occurrence and development. Single-nucleotide polymorphisms (SNPs), the most common human genetic variation, can affect gene expression and be used to predict disease risk [11]; the MCP-1 -2518 A > G (rs1024611) gene mutation stimulated MCP-1 expression following the inflammatory response [12]. In addition, Zakharyan et al. reported that GG genotype carriers had the highest MCP-1 level compared with AA genotype and AG genotype carriers [13]. These studies indicate that the MCP-1 rs1024611 polymorphism may be associated with T2DM and DN risk.

In recent decades, some case‒control studies have investigated the relationship between the MCP-1 rs1024611 polymorphism and the risk of DN or diabetes; however, the results have been inconsistent [14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]. Studies are generally restricted by sample size but meta-analyses have greater testing power and produce comprehensive and reliable conclusions. Although several meta-analyses have reported an association between the MCP-1 rs1024611 polymorphism and DN or diabetes risk [30,31,32], the results were inconsistent; this may have several causes. First, when exploring the correlation between the MCP-1 rs1024611 polymorphism and DN risk, selection of the control group was often not uniform, including patients with diabetes and healthy individuals [31, 32]. Second, in different meta-analyses, inclusion for diabetes differed. For example, Zhang et al. included T1DM and T2DM, while others only included T2DM [30]. Another recent meta-analysis was conducted with a limited number of studies [24]. Therefore, we conducted a comprehensive meta-analysis of all available case‒control studies, aiming to provide reliable evidence for the associations between the rs1024611 polymorphism and DN or T2DM risk using three models: (1) T2DM vs. healthy control; (2) DN vs. healthy control; and (3) DN vs. T2DM.

Material and methods

Literature search strategy

This meta-analysis followed the PRISMA guidelines for systematic reviews [33]. Searches were performed using the PubMed, Web of Science, EMBASE, Cochrane, and the China National Knowledge Infrastructure (CNKI) databases up to May 2023, including articles in English and Chinese. The following search terms were used: (‘diabetes mellitus’ or ‘DM’ or ‘nephropathy’ or ‘DN’ or ‘diabetes’) and (‘MCP-1’ or ‘rs1024611’ or ‘monocyte chemoattractant protein-1’ or ‘CCL2’) and (‘polymorphism’ or ‘genotype’ or ‘mutation’). The comprehensive search strategies for different databases are listed in Table S1. A manual search was conducted for the relevant references cited in these articles, and if more information was needed, we contacted the corresponding authors. When the same population was included in multiple publications, only the latest or complete study was included.

Inclusion and exclusion criteria

Studies meeting all the following criteria were included: (1) observational studies (cohort, case–control, and cross–sectional); (2) at least two comparison groups (T2DM group vs. DN or healthy control group); (3) the distribution of the genotypes in control group and T2DM group (when we compared T2DM group with DN group) was in Hardy–Weinberg equilibrium (HWE); and (4) providing the genotype distribution frequency of the DN and control groups (or T2DM or healthy control groups), or the possibility of calculating this using the literature. Exclusion criteria included: (1) duplicate publications and (2) reviews, case reports, and meta-analyses.

The PECO format was used [33], as follows: (P) patients with T2DM or DN; (E) distribution of the allelic variants of the SNP at MCP-1 rs1024611; (C) control groups; and (O) risk of developing T2DM or DN, as measured by OR.

Data extraction and quality evaluation

Data extraction was performed independently by two researchers based on the inclusion and exclusion criteria. If any information was missing from the selected articles, we contacted the corresponding authors. The extracted information included the first author, year of publication, study design, country and ethnicity of subjects, HWE in the control group, and the number of genotypes in the case and control groups. The studies included in the analysis were scored according to the standard Newcastle–Ottawa Scale (NOS) [34]. Studies with a score ≥ 7 were considered high-quality.

Statistical analysis

Stata version 12.0 software was used for all statistical analyses. A chi-square test was used to examine whether the distribution of genotypes among the control and T2DM groups (compared to the T2DM and DN groups) within each study was in HWE. The odds ratios (ORs) and 95% confidence intervals (CIs) were used to calculate the summary effect size and assess the association between the MCP-1 rs1024611 polymorphism and T2DM or DN susceptibility. Pooled ORs were calculated using the Z test for the dominant (GG + GA vs. AA), recessive (GG vs. GA + AA ), allele contrast (G vs. A), homozygote (GG vs. AA), and heterozygote models (GG vs. GA). P < 0.05 was considered statistically significant. Subgroup analyses and meta-regression for the study population, genotyping method, comorbid chronic disease, and age- and sex-adjustment were performed to identify possible sources of heterogeneity.

Cochran’s (Q) and I2 tests were used to evaluate statistical heterogeneity [35]. The random-effects (RE) model (if PQ < 0.10 or I2 > 50%) was used to calculate the OR and 95% CIs; otherwise, the fixed-effects (FE) model was used to calculate combined effect estimates [36]. A sensitivity analysis was conducted to describe the robustness of our findings. Possible publication bias was tested using funnel plots and Egger’s test.

Results

Study characteristics

A total of 462 studies were obtained through systematic searches. After reading the title, abstract and full text, 446 articles were excluded and the remaining 16 articles were included in the meta-analysis [14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]. A flow chart of the study selection process is shown in Fig. 1. Thirteen studies were based on Asian populations (three studies in Korea, nine studies in China, and one study in India) [14, 15, 17,18,19, 21,22,23,24, 26,27,28,29]; another three studies involved Caucasian populations (one in Turkey, one in Germany, and one in Poland) [16, 20, 25]. Ten studies explored the association between the MCP-1 rs1024611 polymorphism and DN risk. Data extracted from the selected studies are summarized in Table 1 and Table S2.

Fig. 1
figure 1

Flow chart illustrating the trial structure. Abbreviations: CNKI, China National Knowledge Infrastructure; T2DM, type 2 diabetes mellitus; DN, diabetic nephropathy; HWE, Hardy–Weinberg equilibrium

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Table 1 Characteristics of studies that provided genotype frequencies evaluating the effects of MCP-1 rs1024611 polymorphism on DN and T2DM risk
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Association between the MCP-1 rs1024611 polymorphism and T2DM risk

Thirteen studies with 2,363 patients with T2DM and 4,650 healthy controls were eligible and used to estimate the relationship between the MCP-1 rs1024611 polymorphism and T2DM. Significant heterogeneity was detected among the overall population in five genetic models (Table 2). There was no significant difference between the MCP-1 rs1024611 polymorphism and T2DM under the RE model (Table 2).

Table 2 Meta-analysis of the association between the MCP-1 rs1024611polymorphism and T2DM risk (T2DM vs. healthy control)
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Ethnicity subgroup analyses were carried out in the Asian and Caucasian populations. The GG + GA genotype was associated with a lower risk of T2DM in Caucasians under the FE model (OR = 0.79, 95% CI: 0.66–0.93, P = 0.006) and RE model (OR = 0.79, 95% CI: 0.66–0.93, P = 0.006), without significant heterogeneity (PQ = 0.372, I2 = 0.0%) (Fig. 2A; Table 2). The G allele was associated with a lower risk of T2DM in Caucasians under the FE model (OR = 0.84, 95% CI: 0.74–0.97, P = 0.016), but no significant risk was found under the RE model (OR = 0.73, 95% CI: 0.45–1.19, P = 0.202), with significant heterogeneity (PQ =0.097, I2 = 63.6%). Significant associations with T2DM were found for the heterozygote model in Asians under the FE model (GG vs. GA: OR = 0.78, 95% CI: 0.66–0.92, P = 0.003), but no significant risk was found under the RE model (OR = 0.84, 95% CI: 0.67–1.07, P = 0.154), with heterogeneity (PQ = 0.071, I2 = 41.7%) (Table 2). Associations with T2DM were also observed under the dominant model (GG + GA vs. AA: OR = 0.83, 95% CI: 0.72–0.95, P = 0.008) in studies without sex- or age-adjustment compared to studies with adjustment (Figure S1, Table S3). In contrast, no significant risks were found for the other four genetic models accounting for study population, genotyping method, comorbid chronic disease, and age- and sex-adjustment (Table 2, Table S3).

Fig. 2
figure 2figure 2

Forest plot for the association between the MCP-1 rs1024611 polymorphism and T2DM or DN risk with the dominant model (GG + GA vs. AA). A T2DM vs. healthy control; B DN vs. healthy control; C DN vs. T2DM

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Meta-regression revealed that the study population, genotyping method, comorbid chronic disease, and age and sex adjustment were not the causes of heterogeneity in the five genetic models. A forest plot of the dominant model (GG + GA vs. AA) is presented in Fig. 2A and Figure S1.

Association between the MCP-1 rs1024611 polymorphism and DN risk

Seven studies, five involving Asian populations and two involving Caucasian populations, were used to assess the potential correlations between the MCP-1 rs1024611 polymorphism and DN risk. The GG + GA genotype was associated with DN risk in the overall population (OR = 1.27, 95% CI: 1.07–1.51, P = 0.007) under the FE model (Table 3). Significant heterogeneity was detected in the overall population in other four genetic models (Table 3). Furthermore, no significant risks were found in the overall population under the RE model in the four genetic models (Table 3).

Table 3 Meta-analysis of the association between the MCP-1 rs1024611polymorphism and DN risk (DN vs. healthy control)
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Ethnicity-stratified analysis indicated that the GG + GA genotype was associated with DN risk in the Asian population under the FE model (OR = 1.37, 95% CI: 1.11–1.71, P = 0.004) ,without significant heterogeneity (PQ = 0.222, I2 = 30.0%). No significant risks were found in the Caucasian population for any genetic model under either the FE or RE models (Fig. 2B; Table 3). Three genetic models showed that the rs1024611 polymorphism was correlated with DN when applying the amplification refractory mutation detection system-polymerase chain reaction (ARMS-PCR) method (GG vs. GA + AA: OR = 1.92, 95% CI: 1.31–2.81, P = 0.001, I2 = 19.4%; GG vs. AA: OR = 2.70, 95% CI: 1.13–6.43, P = 0.025, I2 = 64.3%; GG vs. GA: OR = 1.62, 95% CI: 1.08–2.43, P = 0.019, I2 = 0.0%) (Table 3, Figure S2). Associations were also observed for the dominant model in patients with DN in sex- and age-adjusted studies (GG + GA vs. AA: OR = 1.34, 95% CI: 1.04–1.72, P = 0.024, I2 = 0.0%) and in patients with DN with no comorbid chronic diseases (GG + GA vs. AA: OR = 1.30, 95% CI: 1.05–1.59, P = 0.014, I2 = 43.9%) (Table S4, Figure S2). Meta-regression revealed that the study population, genotyping method, comorbid chronic disease, and age- and sex-adjustments were not the causes of heterogeneity in the five genetic models. A forest plot of the dominant model is presented in Fig. 2B and Figure S2.

We compared the DN and T2DM groups, including eight studies (seven involving Asian populations and one involving Caucasian populations) with 1,074 patients with DN and 1,361 patients with T2DM. Significant heterogeneity was detected in the overall and Asian populations under five genetic models (Table 4). No significant risks were found in the Asian or Caucasian populations for any genetic models under the RE model (Table 4; Fig. 2C). Five genetic models showed that the rs1024611 polymorphism was correlated with DN compared to T2DM when applying the ARMS-PCR method (GG vs. GA + AA: OR = 1.49, 95% CI: 1.14–1.95, P = 0.004, I2 = 43.7%; GG + GA vs. AA: OR = 2.10, 95% CI: 1.38–3.19, P < 0.001, I2 = 0.0%; GG vs. AA: OR = 2.52, 95% CI:1.59–3.97, P < 0.001, I2 = 0.0%; GG vs. GA: OR = 1.80, 95% CI:1.16–2.79, P = 0.009, I2 = 0.0%; G vs. A: OR = 1.58, 95% CI:1.08–2.32, P = 0.020, I2 = 51.4%) (Table 4, Figure S3).

Table 4 Meta-analysis of the association between the MCP-1 rs1024611polymorphism and DN risk (DN vs. T2DM)
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Meta-regression revealed that genotyping method was a major driver of heterogeneity in five genetic models (GG + GA vs. AA: P = 0.032; GG vs. GA + AA: P = 0.028; GG vs. AA: P = 0.035; GG vs. GA: P = 0.041; G vs. A: P = 0.041), and there was a significant reduction in heterogeneity in the subgroup analysis for genotyping method.

Sensitivity analysis

We performed sensitivity analysis using the leave-one-out method. No single study changed the summarized ORs for all of the genetic models, indicating that our findings are reliable (Figures S4-S6).

Publication bias

A funnel plot showed no significant asymmetry under the dominant model (GG + AG vs. AA) (Fig. 3). P values obtained from Egger’s test are shown in Tables 2, 3 and 4, indicating that there was no publication bias in the four genetic models (T2DM vs. control: GG + GA vs. AA: P = 0.110; GG vs. GA + AA: P = 0.332; GG vs. AA: P = 0.273; GG vs. GA: P = 0.410; G vs. A: P = 0.293. DN vs. control: GG + GA vs. AA: P = 0.770; GG vs. GA + AA: P = 0.934; GG vs. AA: P = 0.984; GG vs. GA: P = 0.821; G vs. A: P = 0.892. DN vs. T2DM: GG + GA vs. AA: P = 0.572; GG vs. GA + AA: P = 0.875; GG vs. AA: P = 0.646; GG vs. GA: P = 0.975; G vs. A: P = 0.660).

Fig. 3
figure 3

Funnel plots for the association between the MCP-1 rs1024611 polymorphism and T2DM or DN risk with the dominant model (GG + GA vs. AA). A T2DM vs. healthy control; B DN vs. healthy control; C DN vs. T2DM

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Discussion

Identification of the possible genetic origin of T2DM and DN could provide a theoretical basis for the early diagnosis or intervention of T2DM and DN. In this pooled analysis, we found that the GG + GA genotype was associated with a lower risk of T2DM in Caucasians, and that the GG + GA genotype was associated with DN risk in Asians. Subgroup analyses were conducted according to population, genotyping method, comorbid chronic disease, and age- and sex-adjustment. We conducted a detailed and comprehensive analysis under five genetic models and three comparative groups. No evidence of publication bias was observed under all genetic models. In addition, we adopted a sensitivity analysis, which did not affect the results of nonsensitivity analysis, indicating that our findings are trustworthy.

To the best of our knowledge, several meta-analyses have reported an association between the MCP-1 rs1024611 polymorphism and DN or T2DM risk [30,31,32]. For example, a 2011 report was the first to investigate this and indicated that the MCP-1 rs1024611 polymorphism was associated with a decreased risk of diabetes in Caucasians but not in Asians [30]; however, both T1DM and T2DM were included and data were not stratified by diabetic type. A 2015 meta-analysis found no association between the MCP-1 rs1024611 polymorphism and DN susceptibility [31]; however, the control group included patients with T2DM and healthy controls, which may influence the results obtained. Additionally, a 2014 meta-analysis comparing DN and T2DM indicated that the GA genotype might be a risk factor for the onset of nephropathy in T2DM among Asians [32]. Based on the above results, the role of the MCP-1 rs1024611 polymorphism in T2DM and DN susceptibility has been summarized and analyzed in the above meta-analyses with contradictory results. Different types of diabetes have heterogeneous pathophysiology [37, 38]. Differences in the selection of cases and controls could explain the observed contradictory results. In the present study, stringency in selecting the control group was maintained, and three groups were compared (T2DM cases and controls; DN cases and controls; T2DM cases and patients with DN). A recent study by Raina et al. (2021) comprising 350 T2DM cases (145 with end-stage renal disease and 205 without end-stage renal disease) and 221 controls in the Indian population have shown an association of the GG genotype and G allele with end-stage renal disease in T2DM cases [24]. An earlier study by Wang et al. (2019) in the Chinese population also associated carriage of the G-allele with DN [27]. However, the above published reviews did not include these two studies. Comprehensive evidence of the relationship between the MCP-1 rs1024611 polymorphism and T2DM and DN risk remains insufficient. A total of 16 studies were selected for the present meta-analysis. To the best of our knowledge, this study is one of the first to conduct a meta-analysis with the largest sample size. The comprehensiveness of the included articles is important for meta-analyses to draw more reliable conclusions.

Our meta-analysis was based on thirteen studies with 2,363 patients with T2DM and 4,650 healthy controls evaluating the association between the MCP-1 rs1024611 polymorphism and T2DM risk. Ethnicity-stratified analysis indicated that the GG + GA genotype might be a protective factor against T2DM susceptibility in Caucasians but not in Asians, which agrees with a previous meta-analysis [30]. The results of the of subgroup analysis (DN vs. healthy controls) differed from those of a previous meta-analysis [31]; we found that the GG + GA genotype was associated with DN risk in Asians, indicating that the MCP-1 rs1024611 G allele represents increased DN risk. This discrepancy might be due to increased research focusing on Asians. Only three of 16 studies involved Caucasians, suggesting that future studies should focus more on Caucasians.

Overall, our results indicate that the MCP-1 rs1024611 polymorphism has varying effects on T2DM and DN susceptibility in different ethnic groups. T2DM and DN are multietiology diseases that are genetically heterogeneous among different populations [39, 40]. Research from different countries shows that the frequency of the G allele for MCP-1 rs1024611 was 25.0% in Caucasians [25], 55.0% in Chinese people [18], and 61.9% in Koreans [23]. This phenomenon might also be explained by clinical heterogeneity. Differences in original research parameters (gender, age, disease severity, different stages of nephropathy, and method of diagnosing T2DM and DN, etc.) may have caused variations in the results [41]. Several studies found that the 2518G allele for MCP-1 rs1024611 was negatively correlated with plasma MCP-1 levels, insulin resistance, male sex, younger participants (age ≤ 50), and T2DM [18, 25]. However, stratified analysis of these factors has rarely been carried out.

This meta-analysis included eight studies with 1,074 patients with DN and 1,361 patients with T2DM and no significant risks were found in the Asian or Caucasian populations for any genetic models. This suggests that the MCP-1 rs1024611 polymorphism does not affect DN progression in T2DM. Because of the small sample size, this correlation needs to be verified by further multiethnic, large-sample-size studies. Meta-regression revealed that genotyping method was a major driver of heterogeneity in five genetic models when comparing the DN and T2DM groups. Additionally, there was a significant reduction in heterogeneity in subgroup analysis for genotyping method. However, study population, genotyping method, comorbid chronic disease, and age- and sex-adjustments were not causes of heterogeneity when comparing the DN or T2DM groups to the healthy group. Several factors significantly impacted heterogeneity (such as sex and disease stage), although the original articles did not provide more information on this. To the best of our knowledge, the present study is the first to identify a genotyping method as a source of heterogeneity in the relationship between the rs1024611 polymorphism and T2DM/DN susceptibility. To carry out a high-sensitivity rs1024611 SNP analysis, using ARMS-PCR is necessary.

Meta-analysis has greater statistical power than individual studies and can produce more reliable results [42, 43]. We used the NOS to evaluate the quality of the selected literature; sensitivity analysis yielded a similar result. A funnel plot and Egger’s test indicated no publication bias in any genetic model. These results suggest that our investigation was credible and robust. However, some limitations should also be acknowledged when interpreting the results. First, although this study had strict inclusion and exclusion criteria, significant heterogeneity existed under some genetic models in the overall and subgroup populations. After stratified analysis by genotyping method, there was a significant reduction in heterogeneity in subgroup analysis. Sex, age, and lifestyle are also related to T2DM and DN development, which may be sources of heterogeneity [44,45,46]. The original articles did not provide complete information on these confounding factors (such as age of onset, age matching, and sex ratio), and subgroup analysis of these factors was restricted. Second, most studies included in this meta-analysis were based on Asian populations, with few studies on Caucasian populations and none on African populations; hence, these data need to be verified in more Caucasian and African populations. Third, this meta-analysis only included Chinese and English articles, which may have led to language bias. Fourth, all the studies were case–control studies. A meta-analysis of cohort studies would give us a more valid result, and more cohort studies must be carried out in the future. Finally, the analysis of the correlation between the MCP-1 rs1024611 polymorphism and DN risk was based on small samples. Larger, well–designed case–control studies should be carried out in the future to elucidate the role of the MCP-1 rs1024611 polymorphism in DN susceptibility.

Conclusions

In summary, the results of our meta-analysis demonstrate that the MCP-1 rs1024611 polymorphism is associated with T2DM susceptibility in Caucasians and with DN in Asians. Larger, well-designed cohort studies should be carried out in the future to verify this association.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.

Abbreviations

ARMS-PCR:

Amplification refractory mutation detection system-polymerase chain reaction

No.:

Number

T2DM:

Type 2 Diabetes Mellitus

DN:

Diabetic nephropathy

HWE:

Hardy–Weinberg equilibrium

MCP-1:

Monocyte chemoattractant protein-1

NOS:

Newcastle–Ottawa scale

CNKI:

Chinese National Knowledge Infrastructure

OR:

Odds ratio

CI:

Confidence interval

PCR-RFLP:

Polymerase chain reaction-restriction fragment length polymorphism

RE:

Random-effects

FE:

Fixed-effects

SNP:

Single-nucleotide polymorphism

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Acknowledgements

Gratitude was given to all participants and contributors who had participated in this study. We would like to thank Editage (www.editage.cn) for English language editing.

Funding

This project was supported by grants from the National Natural Science Foundation of China (82003546; 42375184), the Anhui Natural Science Foundation (1808085MH297), the Excellent and top-notch talent cultivation project in colleges and universities in Anhui Province (gxgnfx2022039), and the Talents Program for Academic Leaders and Reserve Candidates of Wannan Medical College (No. School Administration Letter [2021] No. 46).

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Author notes

  1. Wei-wei Chang, Liu Zhang and Li-ying Wen contributed equally to this work.

Authors and Affiliations

  1. Department of Epidemiology and Health Statistics, School of Public Health, Wannan Medical College, Wuhu, Anhui, 241002, China

    Wei-wei Chang, Li-ying Wen, Yu-jing Tao, Jia-jie Xiong, Xin Tong & Yue-long Jin

  2. Department of Hospital Infection Management Office, Wuhu Hospital of Traditional Chinese Medicine, Wuhu, Anhui, 241000, China

    Liu Zhang

  3. Department of Epidemiology and Health Statistics, School of Public Health, Anhui Medical University, Hefei, Anhui, 230032, China

    Hong Su

  4. Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, No.81 Meishan road, Shushan District, Hefei, Anhui, 230031, China

    Hong Su

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Contributions

CWW and JYL designed the study. TYJ, XJJ, and TX contributed to literature searching, data collection and analysis. SH, JYL, and WLY assessed study quality. CWW and ZL wrote the manuscript. WLY and SH revised the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yue-long Jin or Hong Su.

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Supplementary Information

Additional file 1: Figure S1.

Forest plot of T2DM risk with the dominant model (GG+GA vs. AA) (T2DM vs. healthy control) of the MCP-1 rs1024611 polymorphism. (A) for the overall populations and (B) genotyping method; (C) age- and sex- adjusted; (D) and comorbid chronic disease subgroups. Figure S2. Forest plot of DN risk with the dominant model (GG+GA vs. AA) (DN vs. healthy control) of the MCP-1 rs1024611 polymorphism. (A) for the overall populations and (B) genotyping method; (C) age- and sex- adjusted; (D) and comorbid chronic disease subgroups. Figure S3. Forest plot of DN risk with the dominant model (GG+GA vs. AA) (DN vs. T2DM) of the MCP-1 rs1024611 polymorphism. (A) for the overall populations and (B) genotyping method; (C) age- and sex- adjusted; (D) and comorbid chronic disease subgroups. Figure S4. Sensitivity analysis via deletion of each individual study (T2DM vs. healthy control). (A) for GG+GA vs. AA and (B) GG vs.GA + AA; (C) GG vs. AA; (D) GG vs. GA; (E) and G vs. A models. Figure S5. Sensitivity analysis via deletion of each individual study (DN vs. healthy control). (A) for GG+GA vs. AA and (B) GG vs.GA + AA; (C) GG vs. AA; (D) GG vs. GA; (E) and G vs. A models. Figure S6. Sensitivity analysis via deletion of each individual study (DN vs. T2DM). (A) for GG+GA vs. AA and (B) GG vs.GA + AA; (C) GG vs. AA; (D) GG vs. GA; (E) and G vs. A models. Table S1. The comprehensive search strategies for different databases. Table S2. Main characteristic of included observational studies evaluating the relationship between the MCP-1 rs1024611 polymorphism and DN/T2DM risk. Table S3. Meta-analysis of the association between the MCP-1 rs1024611polymorphism and T2DM risk (T2DM vs. healthy control). Table S4. Meta-analysis of the association between the MCP-1 rs1024611polymorphism and DN risk (DN vs. healthy control). Table S5. Meta-analysis of the association between the MCP-1 rs1024611polymorphism and DN risk (DN vs. T2DM).

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Chang, Ww., Zhang, L., Wen, Ly. et al. Association between the MCP-1 -2518 A > G (rs1024611) polymorphism and susceptibility to type 2 diabetes mellitus and diabetic nephropathy: a meta-analysis. BMC Endocr Disord 23, 267 (2023). https://doi.org/10.1186/s12902-023-01514-z

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Keywords

BMC Endocrine Disorders

ISSN: 1472-6823

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