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. 2018 Aug 17;17:192. doi: 10.1186/s12944-018-0827-0

The relationship between apolipoprotein genes polymorphisms and susceptibility to osteonecrosis of the femoral head: a meta-analysis

Yangquan Hao 1,✉,#, Hao Guo 1,#, Zhaochen Xu 1, Handeng Qi 2, Yugui Wang 2, Chao Lu 1, Jie Liu 2, Puwei Yuan 2,✉
PMCID: PMC6098662  PMID: 30119683

Abstract

Background

The objective of this study was to evaluate whether apolipoprotein gene polymorphisms confer susceptibility to osteonecrosis of the femoral head (ONFH).

Methods

The relevant literature was screened from databases of Pubmed, Embase, Wanfang, Weipu and China National Knowledge Internet (CNKI) until May, 2017. In addition, odds ratio (OR) and its corresponding 95% confidence interval (CI) were used as a measure of effect size for calculating effect size.

Results

Totally, six case-control studies were included in this meta-analysis. It revealed that ApoB-C7623T polymorphism frequency was increased in ONFH group than in control group under three genetic models, including allele model (T vs. C, OR = 4.5149, 95% CI: 1.6968–12.0134); additive model (TC vs. CC, OR = 6.2515, 95% CI: 2.0939–18.6640); and dominant model (TT + TC vs. CC, OR = 5.4998, 95% CI: 1.9246–15.7163). In addition, the increased risk of ONFH were related to ApoA1-rs1799837 polymorphism under additive model (AA vs. GG, OR = 1.4175, 95% CI: 1.0522–1.9096) and recessive model (AA vs. GG + AG, OR = 1.7727, 95% CI: 1.3399–2.3452). However, four ApoB rs1042031, rs693, 3’-VNTR and G12619A polymorphisms under the all genetic models were not associated with susceptibility to ONFH.

Conclusion

The T allele and TC genotype of ApoB-C7623T and AA genotype of ApoA1-rs1799837 may contribute to increase the risk of ONFH.

Keywords: Osteonecrosis of the femoral head, Apolipoprotein A1, Apolipoprotein B, Polymorphism, Genetic model, Meta-analysis

Background

Osteonecrosis of the femoral head (ONFH) is an intractable disease characterized by the death of osteocytes that caused by obstructed circulation to a specific area, which ultimately leads to inadequate blood supply [1]. Approximately 70–80% ONFH patients can eventually result in collapse of necrotic regions of trabecular bone and cartilage degeneration with altered cartilage function, without timely treatment [2]. The orientation and distribution of collagen fibrils is crucial for the correct distribution of loads in the bone [3]. Vertically oriented collagen fibrils with large diameter are the characteristics in degenerative articular cartilage, and derangement and breakage of collagen network can been observed in the femoral head with collapse [4]. The quality of life of ONFH patients may be seriously affected with increased economic burdens. Reportedly, it is evaluated that about 100,000 to 200,000 new cases are troubled with osteonecrosis annually in China [5]. Although several factors such as alcohol, steroids and hypercoagulability have been demonstrated to be related to the progression of ONFH [6–9], the exact pathologic mechanism of ONFH is still unclear. Therefore, more investigation of the molecular mechanisms of ONFH is needed.

Recently, several studies have demonstrated the genetic polymorphisms of endothelial nitric oxide synthase (NOS3) and vascular endothelial growth factor (VEGF) contribute to angiogenesis and bone turnover in ONFH patients [10, 11], revealing genetic factors may act as crucial role in the development of ONFH. Apolipoprotein (APO), a major blood plasma protein, mediates the transport of lipid by its interaction with cellular receptors [12], and lipid metabolism disorder is considered as one of the leading causes for ONFH development [13]. APOs are considered as sensitive markers for estimating lipid metabolic disorder in ONFH populations, whose plasma adiponectin levels are significantly lower than that in healthy controls [14]. Adiponectin level is positively correlated with high-density lipoprotein (HDL), but negatively correlated with triglycerides [14]. Reportedly, the apolipoprotein A1 (ApoA1) level is associated with cholesterol homeostasis and lipid metabolism [15]. Similarly, it reveals that the Apo-A1 levels have significant positive correlation with HDL-cholesterol [16]. Notably, the polymorphisms of APOs genes may be associated with ONFH with altered lipid metabolism. ApoA1 rs632153 polymorphism and ApoB rs1042034, rs676210, rs673548 polymorphisms are significantly associated with alcohol-induced ONFH in the Han Chinese population [17]. In addition, − 75 G > A polymorphism of ApoA1 is associated with susceptibility to osteonecrosis in Chinese population [18]. Moreover, apolipoprotein B (ApoB) gene polymorphism is relevant with the tendon-vessel stagnation syndrome of steroid-induced ONFH [19].

In the recent years, it has proved that genetic susceptibility is closely relevant with ONFH progression, and SNPs and gene mutation are main factors for genetic susceptibility [20, 21]. Several studies have been performed to explore the associations between ApoA1 and ApoB and the susceptibility to ONFH. However, their results are not consistent and the sample sizes are small. Therefore, we applied this meta-analysis to summarize the interactions between polymorphisms of ApoA1 and ApoB and their susceptibility to ONFH.

Methods

Data resources

According to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, the present meta-analysis was designed and performed [22]. After predetermining the search strategy, related studies were retrieved by a search of several electronic databases including Pubmed, Embase and Cochrane Library, as well as Chinese electronic databases such as Cochrane Library, Wanfang, Chinese Biomedicine Literature Database (CBM) and China National Knowledge Infrastructure (CNKI) to May 2017, with no language restrictions. The search keywords were “osteonecrosis OR Osteonecroses” OR “femoral head necrosis” OR ONFH OR “Osteonecrosis of the Femeral Head” OR “avascular necrosis of femoral head” OR “necrosis of the femoral head” OR “avascular necrosis of bone” OR “Kienbock disease” OR “Aseptic necrosis of bone” and “APO* OR apolipoprotein OR Apoprotein”.

Inclusion and exclusion criteria

The studies were needed to adhere to following inclusion criterion: (1) the studies included two groups, ONFH group as experimental group and non-ONFH group as control group; (2) the studies aimed to explore the relationships between the single nucleotide polymorphism (SNP) of APO genes and ONFH; (3) the studies could provide the data of genotype or allele frequency of APO genes’ polymorphisms in both groups; (4) the article was a case-control study.

In following situations, the study was excluded: (1) the data was incomplete, which could not be applied for statistical analysis; (2) if it was a review, letter or report.

Data extraction and quality assessment

By using aforementioned methods, two reviewers separately retrieved the databases, as well as extracted the relevant data from included studies. The extracted information included the name of first author, publication time, research region and time, demographic characteristics of cases numbers, age and sex in each group, and the numbers of each genotype of the APO genes’ polymorphism in both groups. Then, the quality of per eligible study was evaluated using Newcastle-Ottawa Scale (NOS) recommended by Agency for Healthcare Research and Quality (AHRQ) [23]. A third assessor was required to resolve the disagreements existed on the course of data extraction and literature quality assessment, until a consensus was reached.

Statistical analysis

At first, in order to detect the genotype stability of APO genes’ polymorphisms in control group, the chi-square test was utilized to perform Hardy-Weinberg equilibrium (HWE) test [24]. Then, the R 3.12 software was used to conduct the present meta-analysis. The odds ratio (OR) and its corresponding 95% confidence interval (CI) were chosen to calculate the pooled effect size of the dichotomous data [25]. The pooled ORs of per included APO genes’ polymorphisms under allele model, additive model, recessive model, and dominant model, were respectively calculated to analyze their relationships with the risk of ONFH.

Additionally, heterogeneity among the included studies was detected using chi-square-based Q test and I2 statistic test [26]. If Q-statistic (P < 0.05 or I2 > 50%) was examined, indicating there had significant heterogeneity among those studies, and the pooled result needed to measure under the random-effects model. Otherwise (P > 0.05 or I2 < 50%), a fixed-effects model was used [27].

Results

Eligible studies and their characteristics

A total of 173 studies were retrieved by using aforementioned strategies: 27 from PubMed, 29 from Embase, 6 from Cochrane Library, 31 from CBM, 29 from CNKI and 51 from Wanfang. After removing 56 duplicates, 117 articles were remained. Then, total 83 articles that did not meet the subject meaning were further excluded by reading the title and abstract of those articles. In addition, 12 articles including 4 letter or editorial and 8 case series or report were also excluded. Afterwards, the remaining 22 articles were full text reviewed, and 16 of them were eliminated due to 4 articles were reviews, 10 with incomplete data and 2 duplicated populations. Therefore, the remaining 6 articles were included in the present study [19, 28–32] (Fig. 1).

Fig. 1.

Fig. 1

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Flow chart shows the selection process of eligible studies

A total of 1142 ONFH patients and 920 controls were enrolled in those 6 included studies. The included articles were published during 2007 to 2015, and they were mainly conducted in China and Japan. The NOS scores were ranged from 5 to 7 according to the NOS evaluation system, indicating a high quality. The SNP sites of per included APO genes in present study were ApoB-3′-VNTR (variable number of tandem repeats region 3′), ApoB-C7623T, ApoB-G12619A, ApoB-EcoR I (rs1042031), ApoA1-G75A (rs1799837) and ApoB-Xba I (rs693) (Table 1). The HWE test indicated that the majority of genotypes distribution of controls at above APO genes was consistent with HWE (P > 0.05), except the ApoA1-G75A (rs1799837) in Yin JM et al’ study and Wang XY et al’ studies (P < 0.05).

Table 1.

The characteristics of the included studies

Author, Year, Location Study Year NOS Age Gender(Male) SNPs ONFH Control HWE
ONFH/Control ONFH/Control N WH HT MH N WH HT MH Χ2* P
Yin JM, [32] 2014, China 2001.11–2013.9 7 44.6 ± 11.3/44.7 ± 11.7 326/278 ApoA1-G75A(rs1799837) 429 215 73 141 368 170 114 84 43.758 < 0.001
ApoB-EcoR I(rs1042031) 429 391 38 0 368 324 44 0 1.488 0.2226
ApoB-Xba I(rs693) 429 394 35 0 368 327 41 0 1.281 0.2578
ApoB-3′-VNTR 429 336 93 0 368 299 69 0 3.938 0.0583
Hirata T, [29] 2007, Japan 1983–2004 7 40.8(20–64)/ 36.1 (9–63) 22/91 ApoB-C7623T 33 27 6 0 122 115 6 1 2.755 0.0969
ApoB-G12619A 34 33 1 0 123 112 11 0 0.2690 0.6037
ApoA1-G75A(rs1799837) 33 22 11 120 86 34 – –
Wang XY, [31] 2008, China 2003.10–2005.9 5 41.6 ± 10.3/40.7 ± 14.7 98/48 ApoA1-G75A(rs1799837) 143 70 20 53 92 45 28 19 10.447 0.0012
ApoB-EcoR I(rs1042031) 143 125 18 0 92 82 10 0 0.304 0.5815
ApoB-Xba I(rs693) 143 126 17 0 92 87 5 0 0.072 0.7888
ApoB-3′-VNTR 142 109 33 0 92 73 18 1 0.009 0.9247
Zeng P, [19] 2014, China 2010.1–2013.12 5 39.85 ± 10.07/41.04 ± 13.61 53/38 ApoB-EcoR I(rs1042031) 108 95 13 0 98 96 2 0 0.010 0.9187
ApoB-Xba I(rs693) 108 89 19 0 98 92 6 0 0.098 0.7546
Wei XD, [30] 2015, China 2011.1–2012.12 6 39 ± 10/41 ± 14 28/14 ApoA1-G75A(rs1799837) 45 32 13 0 30 28 2 0 0.036 0.8502
ApoB-Xba I(rs693) 45 41 4 0 30 26 4 0 0.153 0.6956
ApoB-EcoR I(rs1042031) 45 31 14 0 30 27 3 0 0.083 0.7731
Wei BF, [28] 2011, China 2007.1–2009.12 5 35.17 ± 11.73/34.76 ± 11.94 27/30 ApoB-C7623T 63 57 6 0 71 71 0 0 – 1.000
ApoB-G12619A 63 56 7 0 71 69 2 0 0.014 0.9042
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SNP Single Nucleotide Polymorphism, Χ2* likelihood-ratio Χ2, WH Wild homozygote, HT Heterozygote, MH mutational homozygote, NOS Newcastle-Ottawa Scale, N The total number of including, ONFH Osteonecrosis of the Femeral Head, HWE Hardy-Weinberg equilibrium tests

Outcomes

Before quantitative synthesis for per included APO genes, an appropriate model was chosen to calculate the pooled effect size. There were striking heterogeneity (P < 0.05, I2 ≥ 50%) among the studies associated with ApoB-G12619A, rs1042031 and rs693 polymorphisms under all genetic models, as well as rs1799837 polymorphism under allele, recessive and dominant models. Therefore, a random-effects model was used to calculate pooled effect size. Meanwhile, except for those noted above, no remarkable heterogeneity between the studies (P > 0.05, I2 < 50%) related to ApoB-rs1799837 on other models, and ApoB-3′-VNTR and ApoB-C7623T polymorphisms under all genetic models were detected, thus the fix-effects model was used to calculate the pooled OR and 95% CIs.

Associations between ApoB-3′-VNTR, G12619A, C7623T polymorphisms and ONFH

Two of six included case-control studies investigated the relationship of ApoB-3′-VNTR polymorphism and ONFH risk [31, 32], and another two studies analyzed the ApoB C7623T and G12619A polymorphisms [28, 29]. As a result, it showed no significant correlation between the ApoB-3′-VNTR polymorphism and ONFH risk under all the genetic models [allele model (B vs. S, OR = 1.1514, 95% CI: 0.8643–1.5339); additive model (BB vs. SS, OR = 0.2237, 95% CI: 0.0090–5.5676); additive model (BS vs. SS, OR = 1.2058, 95% CI: 0.8875–1.6383); recessive model (BB vs. SS + BS, OR = 0.2140, 95% CI: 0.0096–5.3108); dominant model (BB + BS vs. SS, OR = 1.1910, 95% CI: 0.8773–1.6167; Fig. 2)].

Fig. 2.

Fig. 2

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Forest plot of the quantitative synthesis of ApoB-3′-VNTR in ONFH and non-ONFH groups. ONFH: Osteonecrosis of the femoral head. ApoB: apolipoprotein B

Similarly, it also showed lack of significant relationship of ApoB-G12619A polymorphism with susceptibility to ONFH under three genetic models [allele model (A vs. G, OR = 1.2499, 95% CI: 0.1005–15.5444); additive model (AG vs. GG, OR = 1.2557, 95% CI: 0.0933–16.8940); dominant model (AA + AG vs. GG, OR = 1.2557, 95% CI: 0.0933–16.8940; Fig. 3)].

Fig. 3.

Fig. 3

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Forest plot of the quantitative synthesis of ApoB-G12619A in ONFH and non-ONFH groups. ONFH: Osteonecrosis of the femoral head. ApoB: apolipoprotein B

Notably, the increased ApoB-C7623T polymorphism frequencies was observed in ONFH group than in control group under three genetic models [allele model (T vs. C, OR = 4.5149, 95% CI: 1.6968–12.0134); additive model (TC vs. CC, OR = 6.2515, 95% CI: 2.0939–18.6640); and dominant model (TT + TC vs. CC, OR = 5.4998, 95% CI: 1.9246–15.7163; Fig. 4)].

Fig. 4.

Fig. 4

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Forest plot of the quantitative synthesis of ApoB-C7623T in ONFH and non-ONFH groups. ONFH: Osteonecrosis of the femoral head. ApoA1: apolipoprotein A1

Associations between ApoB-rs1042031, rs693 polymorphisms and ONFH

Four of the six studies analyzed the rs1042031 and rs693 polymorphisms in ApoB gene [19, 30–32]. The outcomes showed that the genetic mutation frequencies of ApoB-rs1042031 polymorphism in ONFH patients were not significantly increased than in normal controls under three genetic models [allele model (A vs. G, OR = 1.6863, 95% CI: 0.6928–4.1047); additive model (AG vs. GG, OR = 1.7809, 95% CI: 0.6891–4.6025); dominant model (AA + AG vs. GG, OR = 1.7809, 95% CI: 0.6891–4.6025; Fig. 5)]. In addition, there was no significant difference in rs693 polymorphism between ONFH group and normal group under three genetic models [allele model (T vs. C, OR = 1.3371, 95% CI: 0.5852–3.0553); additive model (TC vs. CC, OR = 1.3630, 95% CI: 0.5695–3.2621); dominant model (TT + TC vs. CC, OR = 1.3630, 95% CI: 0.5695–3.2621; Fig. 6)].

Fig. 5.

Fig. 5

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Forest plot of the quantitative synthesis of ApoB-rs1042031 in ONFH and non-ONFH groups. ONFH: Osteonecrosis of the femoral head. ApoB: apolipoprotein B

Fig. 6.

Fig. 6

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Forest plot of the quantitative synthesis of ApoB-rs693 in ONFH and non-ONFH groups. Squares denote the study-specific outcome estimates, and the size of the square represents the study-specific weight. ONFH: Osteonecrosis of the femoral head. ApoB: apolipoprotein B

Association between ApoA1-rs1799837 polymorphism and ONFH

A total of four studies assessed the association of ApoA1-rs1799837 polymorphism with the occurrence of ONFH [29–32]. The outcomes showed that the ApoA1-rs1799837 was associated with the susceptibility to ONFH under additive model (AA vs. GG, OR = 1.4175, 95% CI: 1.0522–1.9096) and recessive model (AA vs. GG + AG, OR = 1.7727, 95% CI: 1.3399–2.3452). However, it showed that the ApoA1-rs1799837 polymorphism frequencies in ONFH patients were not significantly increased than in controls under three genetic models [allele model (A vs. G, OR = 1.3317, 95% CI: 0.9275–1.9121); additive model (AG vs. GG, OR = 0.7821, 95% CI: 0.3153–1.9399); and dominant model (AA+AG vs. GG, OR = 1.096, 95% CI: 0.7068–1.6998; Fig. 7)].

Fig. 7.

Fig. 7

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Forest plot of the quantitative synthesis of Apo A1-rs1799837 in ONFH and non-ONFH groups. ONFH: Osteonecrosis of the femoral head. ApoB: apolipoprotein B

Discussion

In the present study, the relationships of ApoB-3′-VNTR, C7623T, G12619A, rs1042031, rs693 polymorphisms and ApoA1 rs1799837 polymorphism with susceptibility to ONFH were investigated. It showed that ApoB-C7623T polymorphism in allele model (T vs. C), additive model (TC vs. CC) and dominant model (TT + TC vs. CC) was closely associated with susceptibility to ONFH. In addition, ApoA1-rs1799837 polymorphism was related to the susceptibility of ONFH in additive model (AA vs. GG) and recessive model (AA vs. AG + GG). However, the ApoB-3′-VNTR, G12619A, rs1042031 and rs693 polymorphisms were not significantly associated with susceptibility to ONFH.

ApoB and ApoA1 are the major structural and functional protein constituents of the HDL and triglyceride-rich lipoproteins [33]. The apoB plasma level may reflect the concentration of LDL cholesterol [34], while apoA1 protein level is correlated with increased HDL cholesterol [35]. it has been suggested that the increased ratio of low density lipoprotein to high density lipoprotein (LDL/HDL ratio) can result in overloaded fatty emboli, which play an crucial role in the onset of ON [36, 37]. Additionally, it is considered that the elevated level of apoB/apoA1 ratio acts as a potential risk for ON [38]. Those abnormal lipid metabolisms may increase the risk of ONFH via impacting bone repair and reconstruction [39, 40].

In the present study, the frequencies of T allele and TC genotype at ApoB-C7623T locus in ONFH patients were significantly higher than those in non-ONFH patients or controls. In addition, the additive model (AA vs. GG) and recessive model (AA vs. AG + GG) in ApoA1-rs1799837 were also significantly associated with the increased risk of ONFH. Similarly, two studies have found that the TT or TC genotypes of ApoB-C7623T and A allele of ApoA1(rs1799837) are significantly correlative with higher risks of ONFH [28, 29]. Additionally, Yin et al. have demonstrated that ApoA1-75 bp G > A (rs1799837) is associated with the levels of total cholesterol and HDL in the serum lipid levels [41, 42]. In addition, Hirata et al. have found that there is no significant relationship of the GA or AA genotypes of ApoA1-rs1799837 with susceptibility to ONFH in Japanese population [29]. Conversely, the GA or AA genotypes frequency of ApoA1-rs1799837 are remarkably higher in the ONFH patients than in normal controls from Chinese population [30]. Thus, the racial differences might be the cause of the difference.

Moreover, although it revealed the four ApoB rs1042031, rs693, 3’-VNTR and G12619A polymorphism under all genetic models were not strongly linked to the high risk of ONFH in our work, the pooled OR of those four ApoB polymorphisms were higher in ONFH group. The AG and AA genotypes frequency of ApoB-rs1042031 are higher in the dyslipidemia group [43]. Meanwhile, the rs1042031 and rs693 polymorphisms of ApoB are the lipid profile genetic related in the Kuwait population [44].

In spite of some important findings are revealed in the present study, several limitations are still existed. Firstly, there was significant heterogeneity between the included studies, which might be caused by the different research regions. Meanwhile, the gender and age might also account for the high heterogeneity. Phillips et al. have suggested that gender regulates the association between ApoB and ApoA1 gene polymorphisms and metabolic syndrome risk [33]. Secondly, covariate adjustment and subgroup analysis were not performed, and it might potentially influence the results of the present study. Thirdly, the findings might only be appropriate for the China and Japanese populations. Fourthly, the genotype frequency of Apo AI-G75A (rs1799837) for control group Yin JM et al’ study and Wang XY et al’ studies were not consistent with HWE, indicating that the selected samples in control group might be unable to represent the population in the area. Fifthly, publication bias wasn’t evaluated since the number of included studies < 10 was limited to conduct Egger’s test.

Conclusion

To summarize, the present study suggested that the T allele and TC genotype of ApoB-C7623T, ApoA1-rs1799837 under allele, additive and dominant models might contribute to increase the risk of ONFH in both China and Japanese populations. In addition, it revealed that the four ApoB rs1042031, rs693, 3’-VNTR and G12619A polymorphisms under all genetic models were not strongly associated with the increased risk of ONFH. However, larger scale case-control studies with more patients and controls participants should be included to further assess the interaction of above ApoB and ApoA1 polymorphisms with ONFH susceptibility.

Availability of data and materials

The datasets used and analyzed in the current study are available from the corresponding author in response to reasonable requests.

Abbreviations

AHRQ

Agency for Healthcare Research and Quality

APO

Apolipoprotein

ApoA1

Apolipoprotein A1

ApoB

Apolipoprotein B

CBM

Chinese Biomedicine Literature Database

CI

Confidence interval

HWE

Hardy-Weinberg equilibrium

NOS

Newcastle-Ottawa Scale

NOS3

Nitric oxide synthase

ONFH

Osteonecrosis of the femoral head

OR

Odds ratio

PRISMA

Preferred Reporting Items for Systematic Reviews and Meta-Analyses

SNP

Single nucleotide polymorphism

VEGF

Vascular endothelial growth factor

Authors’ contributions

YQH, HG and ZX conceived and designed the project; HDQ, YGW and CL performed the statistical analysis; JL and PWY wrote the manuscript. All authors read and approved the final manuscript.

Ethics approval and consent to participate

Not applicable.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Contributor Information

Yangquan Hao, Phone: +86-029-62818325, Email: yangquanhaop17@21cn.com.

Puwei Yuan, Email: spine_surgeon@163.com.

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