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Correlation between vascular endothelial growth factor A gene polymorphisms and tendon and ligament injury risk: a systematic review and meta-analysis

Journal of Orthopaedic Surgery and Research volume 19, Article number: 122 (2024) Cite this article

Abstract

Background

Relevant evidence suggests that angiogenic factors contribute significantly to fibril matrix reconstruction following physical injuries to tendon ligaments. Vascular endothelial growth factor A (VEGFA), with its potent angiogenic effect, has been studied extensively, and its functional polymorphisms, including rs699947, rs1570360, and rs2010963, have been the focus of numerous investigations. Some scholars have explored the association between gene polymorphisms in the VEGFA and the risk of tendon ligament injury, but the findings are not entirely consistent.

Objectives

The purpose of this study was to investigate the association between rs699947, rs1570360, and rs2010963 gene polymorphisms in VEGFA and the risk of tendon and ligament injuries.

Methods

After including articles about the association of VEGFA rs699947, rs1570360, and rs2010963 polymorphisms with tendon and ligament injuries according to the search strategy, we assessed their quality and conducted meta-analyses to examine the link between these polymorphisms and the risk of tendon and ligament injuries using odds ratios and 95% confidence intervals.

Results

Of 86 related articles, six were included in the meta-analysis. Some of these suggest an association between VEGFA rs2010963 and the risk of tendon and ligament injury in the population, with the specific C allele being one of the adverse factors for knee injury. Some studies suggest that VEGFA rs699947 and VEGFA rs1570360 single-nucleotide polymorphisms are associated with anterior cruciate ligament rupture. The risk of non-contact anterior cruciate ligament rupture is nearly doubled in individuals with the rs699947 CC genotype compared to the control group. Our analysis did not find any significant relationship between VEGFA gene polymorphisms (rs699947, rs1570360, and rs2010963) and the chance of tendon and ligament injury without consideration of race. However, the European population reveals that the CC genotype of VEGFA rs699947 can result in a greater risk of tendon and ligament injury, whereas the AG genotype for rs1570360 provides some protection. Additionally, rs2010963 was significantly associated with tendon and ligament injury; individuals with the C allele and the CC genotype had higher risk. False-positive report probability confirmed the high credibility of our results.

Conclusion

Overall, this study found no significant association between VEGFA rs699947, rs1570360, and rs2010963 polymorphisms and the risk of tendon ligament injury. However, in subgroup analysis, some genotypes of VEGFA rs699947, rs1570360, and rs2010963 were found to increase the risk of tendon ligament injury in European populations.

Introduction

As sports medicine continues to evolve, tendon and ligament injuries are receiving more and more attention. There are approximately 16.5 million reported cases of tendon and ligament injuries in the USA each year, which not only reduces the quality of life of patients, but also increases the socioeconomic burden [1]. Tendons and ligaments aid in the transmission of muscle strength while upholding joint stability, necessitating them to endure tremendous strain in daily life responsibilities, particularly during physical activity [2]. According to statistics, a professional soccer player sustains two injuries per season, with a higher likelihood of lower limb injuries. Injuries, such as Achilles tendon and anterior cruciate ligament injuries, can critically impact their athletic careers and daily lives [3, 4]. ACL injuries reportedly account for 30% of all knee injuries in high school athletes, with a higher incidence in females than males [5]. Although materials, such as autologous tendons or artificial tendons, can be used to reconstruct the stability of ligaments, a significant number of patients find it difficult to fully recover to their preoperative physical condition. Additionally, ligament reconstruction is a significant risk factor for postoperative ligament re-rupture [6]. And more than half of ACL injuries are non-contact injuries [7]. Achilles tendon disorder is a frequent injury among athletes. The majority of patients occur around the age of 50, according to the study [8]. Meanwhile, the Danish study revealed that the peak sports injury is in September due to concentrated large-scale activities during the summer, implying that aging and overexertion remain critical factors in exacerbating tendon ligament injury risks [8]. While exercise does increase the load on the Achilles tendon, studies suggest that 65% of Achilles tendinopathy cases are not related to exercise [9, 10]. However, it is important to note that body mass index (BMI) is not a consistent risk factor for tendon and ligament injury. Research has shown that individuals with a high BMI have a lower likelihood of recurrent ACL injury, while those with a low BMI are at a heightened risk of secondary tendon and ligament injury [11]. The study discovered that women face a higher susceptibility to ACL injury compared to men. This is attributed to women having a greater degree of knee valgus range of motion upon landing [12]. Similarly, Fares et al. found that the excessively large posterior tibial slope (PTS) is an important risk factor for increased ACL injury [13]. Tendon ligament injuries are influenced by age, sex, movement style, and location of training. Therefore, preventing these injuries is the key to treatment [14].

Research has shown that the formation of new blood vessels can greatly affect tendons and ligaments, particularly during injury repair. As a result, promoting the formation of blood vessels via biological and mechanical stimulation can hasten recovery [15]. VEGFA is a prominent angiogenic agent situated on chromosome 6's short arm. It is made up of an 8-exon and 7-intron coding area of 14-kb and is exceedingly polymorphic [16]. The most prevalent type of genetic variation is the single-nucleotide polymorphisms (SNPs) that arise from the substitution of just a single nucleotide. SNPs or mutations may relate to the predisposition to diseases, the development of diseases, and the effectiveness of targeted medications [17, 18]. The VEGFA promoter contains several typical single-nucleotide polymorphisms (SNPs) that functionally regulate VEGFA expression. These SNPs include −2578C/A (rs699947), −1154G/A (rs1570360), −634C/G (rs2010963), and +936C/T (rs3025039). Among them, rs699947 (C/A), rs1570360 (G/A), and rs2010963 (G/C) are the most commonly studied SNPs associated with angiogenesis, located at the −2578, −1154, and −634 translation start sites in the promoter region [16, 19]. VEGFA, the most angiogenic subtype of the five VEGF subtypes, plays a critical role in regulating the extracellular matrix of tendons and ligaments [20]. Therefore, several studies indicate that genetic variations in VEGFA may be connected to the likelihood of sustaining tendon or ligament injuries [21]. Research has found that the SP1 TT polymorphism present in the COLIA1 genotype is linked to an increased risk of cruciate ligament injury [22]. Additionally, the polymorphism of the COL5A1 gene is associated with the risk of Achilles tendon and quadriceps tendon injuries, as well as anterior cruciate ligament tears [23, 24]. Furthermore, COL5A1 can interact with the MMP3 gene, which encodes matrix metalloproteinase, thereby heightening the probability of Achilles tendinopathy occurrence [25, 26]. This study compares the relationship between rs699947, rs1570360, and rs2010963 gene polymorphisms and tendon ligament injury risk in VEGFA for the first time through meta-analysis, hoping to provide some help for the prevention of related diseases and further personalized treatment.

Materials and methods

Search strategy

The current meta-analysis was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist. We have registered it prospectively at PROSPERO(CRD42023460376). Relevant literature in the databases, including EMBASE, PubMed Central, Web of Science, Cochrane Library, CNKI, and Wanfang Data Knowledge Service Platform, were searched to analyze the relationship between VEGFA gene polymorphisms and tendon ligament injury. The search strategy was ("vascular endothelial growth factor" or "VEGFA" or "vascular permeability factor" or "VPF") and ("polymorphism" or "variant" or "variation" or "mutation" or "SNP" or "genome-wide association study" or "genetic association study" or "genotype" or "allele") and ("tendon" or "ligament" or "Achilles tendon" or "Anterior cruciate ligament" or "Patellar tendon" or "Elbow tendons"). The search deadline was January 2023.

Inclusion and exclusion criteria

Inclusion Criteria: (1) case–control and cohort studies; (2) correlation between VEGFA rs699947, rs1570360, and rs2010963 polymorphisms and tendon and ligament injuries; (3) detailed control and case group genotype data or their OR with 95% CI. Exclusion criteria: (1) reviews, systematic reviews, case reports, letters, and republished studies; (2) non-case–control studies; (3) literature with incomplete genotypes and irrelevant literature.

Data extraction and quality evaluation

Two independent researchers extracted data separately using a strict standard protocol. When disagreements arose, they were resolved through discussion or jointly evaluated with a more senior researcher until a consensus was reached. The extracted information includes the first author, publication year, study country, ethnicity, case and control source, participant sex, number of cases and controls, number of distributed genotypes, diagnostic criteria for tendon ligament injury, and investigators' conclusions. The subject selection, inter-group comparability, and outcome measures for all included studies were evaluated using the Newcastle–Ottawa–Scale (NOS). The higher the total score, the higher the quality of the study. The NOS score was divided into three grades: low, medium, and high quality, namely, < 5, 5–7, and 8–9 points.

Statistical methods

Meta-analysis of data extracted from the included studies was conducted using Stata 17.0 software. The strength of association was assessed using ORs with respective 95% CIs and was considered statistically significant when the P < 0.05. The study compared five genetic models: allele model, additive model, dominant model, recessive model, and over-dominant model. Additionally, a subgroup analysis was conducted for further investigation. Heterogeneity was evaluated using chi-square-based Q and I2 values. P > 0.10 or I2 < 50% indicated no noteworthy heterogeneity among the included studies, which necessitated the use of a fixed-effect model. When significant heterogeneity was present, a random-effects model was employed. Two sensitivity analyses were performed by (1) removing one of the included studies and (2) eliminating studies that did not comply with Hardy–Weinberg equilibrium (HWE). Egger testing and funnel plots were utilized to identify publication bias, while false-positive report probability (FPRP) was employed to assess confidence in all positive outcomes.

Results

Basic characteristics of the included literature

Eighty-six relevant papers were retrieved from major databases via strict implementation of the inclusion criteria. After excluding publications that were not case–control studies, duplicate publications, and other irrelevant literature, nine relevant papers were preliminarily screened; six papers (with 1061 individuals in the case group and 986 individuals in the control group) were finally included after careful reading of the full text. Six articles investigated rs699947, and four articles evaluated rs1570360 and rs2010963. The literature screening process and results are shown in Fig. 1, and the basic characteristics of the included studies are shown in Table 1 [19, 27,28,29,30,31]. The mode of injury and occupational status within the case group are presented in Table 2, and Tables 3, 4 and 5 show the detailed gene frequencies of VEGFA rs699947, rs1570360, and rs2010963 polymorphisms.

Fig. 1
figure 1

Flow diagram of literature searching

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Table 1 Main characteristics and quality score of studies included
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Table 2 Profession and mode of injury in the case groups of included studies
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Table 3 Genotype frequencies of VEGFA rs699947 polymorphism in studies included in this meta-analysis
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Table 4 Genotype frequencies of VEGFA rs1570360 polymorphism in studies included in this meta-analysis
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Table 5 Genotype frequencies of VEGFA rs2010963 polymorphism in studies included in this meta-analysis
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Results of meta-analyses

Six studies examined the link between VEGFA rs69947 gene polymorphisms and the susceptibility to tendon and ligament injuries. However, none of the five genotypes displayed a significant association. Because four of the articles involved European populations, we performed subgroup analyses. There were no significant differences in the allele, additive, over-dominant, or recessive models. However, in the dominant model, heterogeneity decreased from 66.9 to 33% after removing the study by Lulińska-Kuklik et al. [19]; a fixed-effect model was then used to further analyze this finding (OR 0.92, 95% CI 0.86–0.98, P = 0.015). These results indicate that the VEGFA rs699947 AA and AC genotypes are associated with a reduced risk of tendon and ligament injury in European populations (Fig. 2).

Fig. 2
figure 2figure 2

Forest plots of all selected studies on the association between VEGFA polymorphism and the risk of tendon ligament injury in Europeans (A rs699947 dominant model, B rs1570360 over-dominant model, C rs2010963 allele model, and D rs2010963 additive model), CI confidence interval, RR risk ratio

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Four papers investigated gene polymorphisms in VEGFA rs1570360, and there were no significant differences in all gene models. In a subgroup analysis of the European population, the over-dominant model showed a directional change in heterogeneity after removing the study by Rahim et al. [31]. When this study was excluded, both the AA and GG genotypes in VEGFA rs1570360 increased the risk of tendon and ligament injury in the European population (OR 1.29, 95% CI 1.14–1.45, P < 0.001, Fig. 2). Similarly, four studies investigated the associations between VEGFA rs2010963 gene polymorphisms and tendon and ligament injury risk. There were no significant differences in any of the models. In European populations, the allele and additive gene models had reduced heterogeneity (from 56.2 to 0% and 57.4 to 16.7%, respectively) after removing data from each of two studies by Rahim et al. [29] and [31], respectively). In the European population, the G allele in VEGFA rs1570360 had a protective effect against tendon and ligament injury (OR 1.15, 95% CI 1.00–1.32, P = 0.045, Fig. 2), and the GG genotype was associated with a lower risk of tendon and ligament injury than the CC genotype (OR 1.40, 95% CI 1.00–1.94, P = 0.049). These data are shown in detail in Table 6 and 7.

Table 6 Pooled estimates of association of VEGFA rs699947, rs1570360, and rs2010963 polymorphisms and the risk of tendon injury
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Table 7 Pooled estimates of the association of VEGFA rs699947, rs1570360, and rs2010963 polymorphisms with tendon injury risk in Europeans
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Publication bias and sensitivity analyses

The meta-analysis found significant heterogeneity between individual studies, possibly due to factors such as race, sex, and age. No subgroup analyses were performed as gender and age were not grouped in the included studies. In the subgroup analysis of races, we found that after the European population excluded Kulik et al. (2019) in the dominant model of rs699947, Rahim et al. [31] in the over-dominant model of rs1570360, and deleted Rahim et al. [29] and Rahim et al. [31] in the allele model and additive model of rs2010963, respectively, the I2 value changed from > 50 to < 50%, so there were considered as a source of heterogeneity and removed. The studies that remained showed no change in heterogeneity when the included papers were excluded individually. To assess publication bias, both the Egger test and funnel plot were used. The results were relatively stable and there was no clear publication bias, as shown in the funnel chart (Figs. 3 and 4) and Egger detailed data (Table 6 and 7).

Fig. 3
figure 3

Sensitivity analysis and publication bias funnel plot of the VEGFA polymorphisms and risk of tendon ligament injury

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Fig. 4
figure 4

Sensitivity analysis and publication bias funnel plot of the VEGFA polymorphisms and risk of tendon ligament injury in Europeans

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Confidence test for positive results

All positive results are evaluated for FPRP values under various prior probability conditions by OR and 95% CI in order to determine whether they are truly associated with the risk of tendon ligament injury. A FPRP value < 0.2 is considered to indicate high confidence in the results. The confidence tests conducted in this meta-analysis found that the statistically significant positive results were reliable (Table 8).

Table 8 FPRP values for meta-analysis results
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Haplotypes analysis

VEGF has several commonly studied SNPs (−2578 C/A, −460T/C, −1154 G/A, +405 G/C, and +936 C/T) that may be associated with susceptibility to certain diseases. For instance, Xia Han et al. conducted haplotype analysis and discovered that T–C–T, C–C–C, and C–G–C haplotypes were all genetic susceptibility factors for coronary heart disease (OR: 2.43, 2.77, and 2.33) based on VEGF SNP (−460T/C, −634G/C, and 936C/T) [32]. Similarly, Eun-Ju Ko et al. found that VEGF −1154G>A, −1498T>C, +936C>T, +1451C>T, +1612G>A, +1725G>A haplotypes G–T–T–C–G, G–C–C–A–A, and A–T–C–G–G were strongly correlated with coronary artery disease sensitivity in their populations [33]. Haplotype analysis between VEGF −2578 C/A, −460T/C, −1154 G/A, and +405 G/C SNP found that haplotype C–T–G–G had a higher risk of endometriosis than haplotype C–C–G–G and A–T–G–G [34]. The above studies suggest that the SNPs of VEGF and the haploids that are composed between them do affect the susceptibility of some parts of this population to certain diseases. In this included study, Rahim et al. [29] found that haploid A–G–G of VEGFA (−2578C/A, −1154G/A, −634C/G) was positively correlated with Achilles tendinopathy. Lulińska-Kuklik et al. [19] believed that haploid C–G–C of VEGFA (−2578C/A, −1154G/A, −634C/G) increases the risk of ACL injury, while haploid C–G–G has the effect of protecting the ACL.

Discussion

Tendon and ligament injuries commonly arise during physical activity. Incomplete statistics suggest that the likelihood of Achilles tendon injuries in athletes is approximately five times higher than that in the general population [10]. When tendon ligaments are damaged, it often leads to pain and discomfort, which can significantly impact one's quality of life. Anterior cruciate ligament injuries are mainly non-contact injuries in sports, with offensive running being the most prevalent cause [35]. Some studies have found that a greater ankle flexion angle does not protect the ACL because the heel does not make full contact with the ground, causing the calf muscles to be unable to fully absorb the reaction force from the ground, increasing stress on the knee joint [36]. Achilles tendinopathy is caused by the reduction of negative pressure tolerance and continuous overload of the Achilles tendon, which leads to degeneration and failure of healing of the Achilles tendon. Its characteristics mainly include local or diffuse increase in thickness, loss of normal collagen, and loss of normal tissue [37]. Although the two are not identical in terms of pathology, there may be certain similarities in the underlying causes. Therefore, it is important to identify the cause of tendon ligament injury and prevent its occurrence. There are many causes of tendon ligament injury, and in addition to external factors such as body weight and exercise, genetic contributions are also receiving more and more attention [38]. Studies have found that VEGF rises to preoperative levels up to 16 times after ACL injury [39, 40]. As one of the most potent subtypes, VEGFA could potentially assist in the clinical prevention of tendon ligament injuries by investigating the link between its gene polymorphism and the likelihood of tendon ligament injury. Through statistical analysis, it was found that there was no significant statistical difference between VEGFA rs699947, rs1570360, and rs2010963 gene polymorphisms and the risk of tendon ligament injury without distinguishing populations, and the probability of damage in each genotype was basically the same. In the subgroup analysis of the European population, we found that the population with AA and AC genotypes in the dominant model of VEGFA rs699947 had a lower probability of tendon ligament injury than the population with CC genotype, and the difference was statistically significant. Similarly, in the VEGFA rs1570360 over-dominant model, the AG genotype had a statistically significant difference in protecting tendon ligament injury in the European population compared with other genotypes. Studies have found that the rs1570630 GG genotype is linked to elevated expression of VEGFA. However, the overexpression of VEGFA may also decrease the biomechanical strength of tendons [20]. Additionally, individuals with the rs1570630 GG genotype tend to be heavier than those with other genotypes [41], which further raises their risk of tendon and ligament injuries. In the allele model of VEGFA rs2010963, G gene has the effect of reducing tendon ligament injury, and people with GG genotype in the additive model also have a lower risk of tendon ligament injury.

This meta-analysis has the following advantages: (1) the relationship between VEGFA rs699947, rs1570360, and rs2010963 gene polymorphisms and the risk of tendon ligament injury was studied for the first time, which was the most innovative in this study; (2) all included studies were assessed and scored in detail; (3) HWE calculations are performed on genotype frequencies to ensure that the final results are true and reliable. However, there are still the following shortcomings in this study: (1) the number of included articles is limited, and the final results may be slightly different from the real results, and this meta is secondary literature and cannot be corrected for multiple tests and report the adjusted p value; (2) there may be some confounding when analyzing across populations because gene frequencies vary between different populations, heterogeneity in some comparisons was not well resolved despite subgroup analyses. Heterogeneity should be considered when interpreting study results, and future studies should focus on more homogeneous patient populations; (3) inability to control factors such as age, gender, weight, and other potential confounding factors may have an impact on the final result; (4) since this subgroup analysis only involved European populations, the results were only for European populations; (5) Although there may be similarities in the genetic susceptibility to Achilles tendinopathy and ACL rupture, the pathologies are not completely identical.

Conclusion

This analysis did not find any significant relationship between VEGFA gene polymorphisms (rs699947, rs1570360, and rs2010963) and the overall risk of tendon and ligament injuries. However, in the European population, individuals with the CC genotype of VEGFA rs699947 have a higher risk of experiencing tendon and ligament injuries. Conversely, those with the AG genotype of rs1570360 demonstrate a protective function against these injuries. At the same time, rs2010963 is significant in evaluating the risk of tendon ligament injury. It was statistically determined that individuals carrying the C allele and those with the CC genotype are highly susceptible to this risk. All of the results were validated by FPRP.

Availability of data and materials

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

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Authors and Affiliations

  1. Department of Orthopaedics, Heping Hospital Affiliated to Changzhi Medical College, 110 South Yan’an Road, Changzhi, 046000, People’s Republic of China

    Xi-yong Li, Yun-lu Wang & Peng-fei Han

  2. Graduate School, Changzhi Medical College, Changzhi, People’s Republic of China

    Xi-yong Li, Yun-lu Wang, Su Yang, Chang-sheng Liao & Song-feng Li

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Contributions

XYL and YLW were responsible for the design of the current study, and both performed the statistical analysis. XYL and YLW confirmed the authenticity of all the raw data. SY, CSL, and SFL were responsible for the acquisition and sorting of data. PFH performed the interpretation of the data. All authors read and approved the final manuscript.

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Correspondence to Peng-fei Han.

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Xi-yong Li and Yun-lu Wang were considered as co‑first authors

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Li, Xy., Wang, Yl., Yang, S. et al. Correlation between vascular endothelial growth factor A gene polymorphisms and tendon and ligament injury risk: a systematic review and meta-analysis. J Orthop Surg Res 19, 122 (2024). https://doi.org/10.1186/s13018-024-04589-z

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Keywords

Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X