Evidence-Based Complementary and Alternative Medicine

Evidence-Based Complementary and Alternative Medicine / 2018 / Article

Research Article | Open Access

Volume 2018 |Article ID 8514619 | 12 pages | https://doi.org/10.1155/2018/8514619

UHPLC-Q-TOF MS-Based Metabolic Analysis for the Therapeutic Efficacy of “Xuebijing Injection” against Sepsis-Induced Acute Lung Injury

Academic Editor: Pierre Champy
Received23 May 2018
Revised01 Jul 2018
Accepted06 Aug 2018
Published23 Sep 2018


“Xuebijing Injection” (XBJ) is a traditional Chinese medicine and has been wildly used in the treatment of sepsis in China. However, few studies have reported the use of XBJ in sepsis with acute lung injury (ALI). This study aimed to investigate the therapeutic efficacy of XBJ against sepsis-induced ALI. Generally a total of 27 mice were equally randomized into three groups: a sham group was given saline before sham operation. A sepsis group received the cecal ligation and puncture (CLP) operation only. A sepsis+XBJ group, XBJ, was injected at 72, 48, and 24 h before CLP operation. The lung tissue was collected for UHPLC-Q-TOF/MS profiling analysis, biomarker identification, and pathway analysis. With the analysis of principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA), forty-five purine, amino acid, and sphingolipid metabolites in lung tissues were identified as potential biomarkers of sepsis-induced ALI, among which 22 were reversed in the sepsis+XBJ group significantly. Conclusively, our results suggest that purine metabolic pathway, glutathione metabolic pathway, sphingomyelin metabolic pathway, arachidonic acid metabolic pathway, and phospholipid metabolic pathway may be the potential therapeutic pathways to overcome sepsis-induced acute lung injury and we provided the potential mechanisms of protective effects of XBJ against ALI.

1. Introduction

Sepsis, characterized by high morbidity and mortality rate, has been the leading cause of critical illness worldwide [1, 2]. Among these patients, over 40% are at risk of progressing to acute lung injury (ALI), a lung disease with high morbidity [3, 4]. The treatments for sepsis-induced ALI include liquid resuscitation, antibiotic therapy, blood purification, and stem cell therapy. Despite the tremendous progress in the understanding of the mechanism of sepsis in the field of intensive medicine and other basic sciences, the mortality rate remains at a high level over the past few decades, especially in low- and middle-income countries [5]. Xuebijing injection (XBJ), a traditional Chinese herbal prescription, has been approved by the State Food and Drug Administration (SFDA) and widely used in the clinical treatment of severe sepsis. XBJ is made up of more than 20 constituents including chlorogenic acid, hydroxysafflor yellow A, rutin, and ferulic acid [6, 7]. It is an anti-inflammatory drug and has been widely used in China to block the progression of sepsis and reduce the incidence and mortality of sepsis [8]. In addition, XBJ can shorten the mean length of hospitalization, the Acute Physiology and Chronic Health Evaluation-II score (APACHEII score), White Blood Cell (WBC), C-Reactive Protein (CRP), Neutrophil (NEU), and Temperature (T0) of patients with sepsis. Above all, XBJ treatment can reduce the 28-day mortality of patients with severe sepsis [9]. However, the mechanisms of “Xuebijing injection” against sepsis-induced acute lung injury has is still not clear, and comprehensive mechanisms remain to be elucidated.

Metabolomics is a rapidly advancing field after the development of genomics, transcriptomics, and proteomics and can serve as a tool for the analysis of biological tissues [10]. Metabolomics can show us a better perspective to explore the entire organisms [11]. This technology can be also used to assess the holistic efficacy of traditional Chinese medicines and reveal the biomarkers of sepsis and sepsis-induced acute lung injury [12, 13]. In this study, it is the first time to use a metabonomic-based approach to explore the comprehensive changes in lung tissues in a murine model of sepsis-induced ALI and the therapeutic efficacy of XBJ against ALI.

2. Materials and Methods

2.1. Reagents

XBJ was purchased from CHASE SUN Co., Ltd (Tianjin, China). Formic acid (FA) (HPLC grade) was purchased from the Fluka Chemical Corp (Buchs, Switzerland). Methanol (HPLC grade) and acetonitrile (HPLC grade) were purchased from Merck (Darmstadt, Germany). 2-Chloro-L-phenylalanine (Sigma-Aldrich, St Louis, MO, USA) was used as an internal standard. Chromatography mass spectrometry (GC-MS) was performed using the Milli-Q system (Millipore, Bedford, MA, USA) with ultrapure water.

2.2. Animals and Groups

Male specific-pathogen-free C57B/L6 mice weighing 21-25g (Animal Lab Center of the Navel Medical University, Shanghai, China) were housed in a standard 12h light/dark cycle, constant temperature condition with free access to food and water. All the experiments were approved by the Animal Care and Use Committee of Tongji University (Shanghai, China). Sepsis was induced by cecal ligation and puncture (CLP) as described before [14]. Twenty-seven equally randomized into 3 groups: sham group, treated with sham operation, and saline only; model group; and treatment group, treated with 4ml/kg XBJ injection (CHASE SUN Co., Ltd. Tianjin, China) via the tail vein at 72, 48, and 24 h before CLP [15]. The lung tissues were collected from each group and stored at -80°C for future study.

2.3. Histology and Immunohistochemistry Analysis

After the experiments were finished, the lung tissues were perfused with normal saline (NS), inflated with 1ml formalin and removed en bloc after tracheal ligation. After that, the lung tissues were fixed in 10% PBS buffered formalin for 24 h at room temperature and embedded in paraffin. Hematoxylin and eosin (H&E) staining was performed using the standard protocol. For immunohistochemistry of ICAM and VCAM, tissue sections or cells were incubated with the primary rabbit anti-ICAM (1:2000; cell signal tech, Boston, USA) and anti-VCAM (1:2000; cell signal tech, Boston, USA) antibody, followed by the secondary goat anti-rabbit antibody (Beyotime Institute of Biotechnology, Shanghai, China). Immunohistochemical images were captured with a digital camera (Nikon, Tokyo, Japan).

2.4. Sample Preparation and Test

The frozen lung tissues were thawed at room temperature, added with 0.3ml ice-cold methanol containing 25μg/ml 2-chloro-L-phenylalanine as the internal standard to precipitate the protein and extract the metabolites, and mixed by vortex 5 min. These samples were tranquilized for 10 min. After centrifugation at 13000rpm, 4°C for 15 min, the clear supernatant was transferred to a sampler vial.

A quality control (QC) sample was used to monitor the data acquisition performance during analysis. The QC sample was prepared by pooling aliquots from all lung samples collected in our study.

2.5. UHPLC-Q-TOF MS Analysis

UHPLC-Q-TOF/MS profiling analysis was performed using an Agilent 1290 Infinity LC system equipped with an Agilent 6530 Accurate-Mass Quadrupole Time-of-Flight (Q-TOF) mass spectrometer (Agilent Technologies, USA). Chromatographic separations were performed at 40°C using an Acquity UPLC HSS T3 column (2.1 mm × 100 mm, 1.8 μm; Waters, Milford, MA, USA). The mobile phase was composed of 0.1% formic acid (A) and ACN modified with 0.1% formic acid (B). The total run time for one sample was 25 min including 6 min for equilibration and the optimized UHPLC elution conditions were set at: 5%B, 0-2 min; 5%-15%B, 2-10 min; 15%-30%B, 10-14 min; 30%-95%B, 14-17 min; and 95%B, 17-19 min. The injection volume was 3 μL and the flow rate was set to 0.4 ml/min, and the autosampler was maintained at 4°C.

An electrospray ionization source (ESI) was operated in both positive and negative ion modes of operation. The optimized conditions used were as follows: capillary voltage, 4 kV for the positive mode and 3.5 kV for the negative mode; drying gas flow, 11 L/min; gas temperature, 350°C; fragment or voltage, 120 V; nebulizer pressure, 45 psig; and skimmer voltage, 60 V. Data were collected in the profile mode and the mass range was set from 50 to 1,100 m/z. The biomarkers were further analyzed by MS/MS, and the collision energy was set from 10 to 40 eV.

2.6. Statistical Analysis

The UHPLC-MS raw data in the instrument specific format were converted to common (mz.data) data format files using the Agilent Mass Hunter Qualitative software (Agilent Technologies, USA), in which the threshold was set to 0.1% and all isotope interferences were excluded. The XCMS program [16] (https://xcmsonline.scripps.edu) was used for peak extraction, retention time correction, RT alignment, and integration, in order to generate a visualization matrix. The ions were filtered to an 80% concentration [17], and to correct the MS response shift, all detected ions in each sample were normalized to total intensity. The three-dimensional (3D) data, including the sample names, RT, and m/z pairs, were imported to SIMCA-P software (version 11.0, Umetrics, Umea, Sweden) for principal component analysis (PCA) and partial least squares discriminate analysis (PLS -DA). Variable importance plot (VIP) with the threshold value of 1 was used to select metabolites. Data are represented as mean ± standard deviation (SD). The statistical significant differences were analyzed by SPSS 17.0, using Student’s t-test and one-way ANOVA. P < 0.05 was considered statistically significant.

2.7. Identification of Biomarkers and Pathway Analysis

To identify the discovered biomarkers, the exact masses of ion were input into databases such as Metlin (http://metlin.scripps.edu), Human Metabolome Database (http://www.hmdb.ca/) and PubChem (http://pubchem.ncbi.nlm.nih.gov). The metabolic pathway was drawn by the Smartdraw software (SmartDraw 7.5 Hemera Technologies Inc) based on the biomarkers found in the experiment.

3. Results

3.1. Histopathology

To assess the protective effect of XBJ, the lung tissue sections were observed under a light microscope. As shown in Figure 1, after CLP, the lung tissues in the model group displayed thick lung septa, vascular congestion, and expansion and became congested by neutrophils. However, the severity was ameliorated after XBJ treatment as compared with the model group.

ICAM and VCAM are two types of proinflammatory adhesion molecules. As shown Figure 1, the expression of ICAM and VCAM in the treatment group was significantly decreased as compared with the model group.

3.2. Metabolic Profiling Analysis of Lung Tissues

UHPLC-Q-TOF/MS data of the lung tissues were acquired based on the above methods. Figure 2 shows the representative total ion chromatograms (TICs) in the positive mode and negative mode. These two figures displayed the general information of UHPLC-Q-TOF/MS detection. PCA score plot showed that the QC samples gathered into groups tightly, indicating that this system was stable. As shown in Figure 3, together with PLS-DA scatter plot and variable importance plots (VIPs), we defined different metabolites in the three groups. The metabolites that we chose were the points far away from the origin point in Figures 3(a) and 3(b). The metabolites with VIPs > 1.0 were considered to be important differential biomarkers. Then in Figures 3(c) and 3(d), the positive and negative modes of supervised partial least squares discriminate analysis (PLS-DA) plot were used to screen potential metabolite biomarkers from the obtained data [18]. One-way ANOVA and Tukey’s post hoc test were used to assess the statistical significance.

3.3. Identification of Biomarkers

To identify biomarkers, we used the extracted ion chromatogram (EIC) to confirm the ions and then put the accurate molecular mass of ions into the Mass Bank (http://www.massbank.jp/), Metlin (http://metlin.scripps.edu/) and Human Metabolome Database (http://www.hmdb.ca/) to verify the structure that we speculated [17, 19]. Then, detected the corresponding quasi-molecular ion peak according to the retention time (RT) in the extracted ion chromatogram (EIC) of m/z 137.0458 (Figure 4(b)). Measured by Agilent MassHunter software, the accurate mass was 137.0458, and C5H4N4O was calculated as the most probable molecular formula. Then, the m/z of 137.0458 was identified as hypoxanthine by considering the elemental composition, fragmentation pattern, and chromatographic retention behavior, which was validated by a standard compound (Figure 4(c)). Similarly, other biomarkers have been identified according to the above method and are listed in Table 1 [20].

NORT/minDetected M/ZTheoretical M/ZIonFormulaPPMMetabolitesFold changeRelated pathway

10.70132.0766132.0768[M+H]+C4H9N3O21.51Creatine 0.481.55Glycine, serine and threonine metabolism
21.01137.0458137.0458[M+H]+C5H4N4O0Hypoxanthine 0.391.19Purine metabolism
31.05151.0254151.0261[M-H]-C5H4N4O24.63Xanthine 0.781.11Purine metabolism
41.01169.0358169.0356[M+H]+C5H4N4O31.18Uric acid 1.760.80Purine metabolism
51.01308.0907308.0911[M+H]+1.30Glutathione 0.322.57Glutathione metabolism
61.01306.0742306.0765[M-H]-7.51Glutathione 0.292.00Glutathione metabolism
71.31132.1018132.1019[M+H]+C6NO20.76L-Leucine 0.981.02Valine, leucine and isoleucine metabolism
88.45274.2743274.2741[M+H]+NO20.73C16 Sphinganine 0.662.86 Sphingolipid metabolism
99.80300.2902300.2897[M+H]+NO21.67Sphingosine 0.930.56 Sphingolipid metabolism
1010.84339.2895339.2894[M+H]+O30.29Glycidyl oleate 1.391.43Linoleic acid metabolism
1114.17255.2320255.2330[M-H]-O23.92Palmitic acid 0.800.79Fatty acid metabolism
1213.44303.2319303.2330[M-H]-O23.63Arachidonic Acid 0.721.44Arachidonic acid metabolism
1310.11478.2934478.2928[M+H]+NO7P1.25LysoPE(18:2/0:0) 1.851.21Phospholipid metabolism
1410.18526.2935526.2928[M+H]+NO7P1.33PE(22:6/0:0) 1.281.34Phospholipid metabolism
1510.18502.2933502.2928[M+H]+NO7P1.00LysoPE(20:4/0:0) 1.411.25Phospholipid metabolism
1610.18361.2741361.2737[M+H]+O31.11O-Arachidonoyl Glycidol 1.441.23Phospholipid metabolism
1710.21568.3400568.3398[M+H]+NO7P0.35LysoPC(22:6) 0.591.37Phospholipid metabolism
1810.21544.3405544.3398[M+H]+NO7P1.29LysoPC(20:4) 0.761.08Phospholipid metabolism
1910.24520.3404520.3398[M+H]+NO7P1.15LysoPC(18:2) 0.840.81Phospholipid metabolism
2010.44528.3090528.3085[M+H]+NO7P0.95LysoPE(22:5/0:0) 1.291.59Phospholipid metabolism
2110.57504.3087504.3085[M+H]+NO7P0.40LysoPE(20:3/0:0) 1.351.46Phospholipid metabolism
2210.62496.3404496.3398[M+H]+NO7P1.21LysoPC(16:0) 0.612.31Phospholipid metabolism
2310.69454.2933454.2928[M+H]+NO7P1.10LysoPE(0:0/16:0) 0.940.84Phospholipid metabolism
2410.84480.3093480.3085[M+H]+NO7P1.67LysoPE(18:1/0:0) 1.471.44Phospholipid metabolism
2511.01482.3610482.3605[M+H]+NO6P1.04PC(O-16:0/0:0) 1.630.79Phospholipid metabolism
2611.03530.3247530.3241[M+H]+NO7P1.13LysoPE(22:4/0:0) 1.701.38Phospholipid metabolism
2711.09438.2985438.2979[M+H]+NO6P1.37PE(P-16:0/0:0) 1.010.67Phospholipid metabolism
2811.16506.3244506.3241[M+H]+NO7P0.59LysoPE(20:2/0:0) 1.541.43Phospholipid metabolism
2911.99524.3717524.3711[M+H]+NO7P1.14PC(18:0/0:0) 1.060.97Phospholipid metabolism
3112.01558.3555558.3530[M+H]+NO7P4.48PC(21:4/0:0) 1.581.48Phospholipid metabolism
3212.01482.3248482.3241[M+H]+NO7P1.45LysoPE(0:0/18:0) 0.810.79Phospholipid metabolism
3312.03508.3400508.3398[M+H]+NO7P0.39LysoPE(20:1/0:0) 1.411.52Phospholipid metabolism
3412.35510.3918510.3918[M+H]+NO6P0PC(O-18:0/0:0) 2.180.66Phospholipid metabolism
3610.63452.2777452.2783[M-H]-NO7P1.33PE(16:0/0:0) 0.810.50Phospholipid metabolism
3710.14476.2777476.2783[M-H]-NO7P1.26LysoPE(0:0/18:2) 1.450.95Phospholipid metabolism
3810.87478.2936478.2939[M-H]-NO7P0.63PE(18:1/0:0) 1.240.98Phospholipid metabolism
3912.09480.3088480.3096[M-H]-NO7P1.67LysoPE(0:0/18:0) 0.910.83Phospholipid metabolism
4010.21500.2779500.2783[M-H]-NO7P0.80LysoPE(0:0/20:4) 1.230.96Phospholipid metabolism
4110.59502.2930502.2939[M-H]-NO7P1.79LysoPE(0:0/20:3) 1.150.99Phospholipid metabolism
4210.20524.2782524.2783[M-H]-NO7P0.19LysoPE(0:0/22:6) 1.121.04Phospholipid metabolism
4310.78526.2934526.2939[M-H]-NO7P0.95LysoPE(0:0/22:5) 1.331.02Phospholipid metabolism
4411.07528.3093528.3096[M-H]-NO7P0.57LysoPE(0:0/22:4) 1.370.96Phospholipid metabolism
4510.64540.3303540.3307[M+FA-H]-NO7P0.74PC(16:0/0:0) 0.870.91Phospholipid metabolism
4610.99566.3454566.3463[M+FA-H]-NO7P1.59PC(P-16:0/2:0) 0.661.06Phospholipid metabolism
4712.04568.3616568.3620[M+FA-H]-NO7P0.70PC(O-16:0/2:0) 1.050.92Phospholipid metabolism
4810.23588.3298588.3307[M+FA-H]-NO7P1.53PC(20:4/0:0) 0.680.99Phospholipid metabolism

3.4. Evaluation of the Mechanism Underlying the Effect of XBJ on Sepsis-Induced ALI

Finally, we identified 45 metabolites in the lung tissues to be the potential biomarkers of sepsis-induced ALI. These metabolites were valid to evaluate the protective effect of XBJ on sepsis-induced ALI. According to these statistics, we established a PCA model, R2X=0.544 and Q2=0.56, demonstrating that the model was reliable and predictive. All identified different metabolites are listed in Table 1, indicating that, among these 45 metabolites identified, 22 metabolites were reversed in the treatment group. Furthermore, the heatmap of these 45 metabolites was presented in Figure 5 both in positive and negative mode. To gain an insight into metabolic changes in different groups, we put the data into Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway database (http://www.genome.jp/kegg/). The pathways of the identified metabolites are shown in Figure 6 by mainly focusing on fatty acid metabolism, amino acid metabolism, purine metabolism, and phospholipid metabolism.

4. Discussion

Sepsis is a common clinical condition associated with septic shock and MODS in ICUs. More than 40% patients with sepsis are at risk of progressing to ALI [4]. Previous studies showed that Gram-negative bacterial infections still play a central role in the pathogenesis of ALI and ARDS [21]. In this study, we established the sepsis-induced ALI model following the method described previously [14]. It was found in our study that the metabolites promoting oxidative stress were reduced significantly and after XBJ treatment the symptoms of ALI were alleviated, and the survival rate was improved.

No effective methods are currently available for the clinical treatment of sepsis-induced ALI. The meta-analysis performed by Shi H el al. showed that XBJ had a significant clinical effect on patients with sepsis [9]. But the extract efficacy of XBJ remains unclear. Inflammatory mediators, such as ICAM and VCAM, block the microvessels and lead to activation of leukocytes to release inflammatory mediators. These mediators can also release a large amount of oxygen free radicals [22, 23]. What is more, ICAM and VCAM are the mediators after the stimulation of TNF-α, IL-1, and endotoxin, leading to adhesion, aggregation, rolling, and exudation of leukocytes [24].

It was found in this study that less ICAM and VCAM gathered in the XBJ treatment as compared with the model group, indicating that XBJ was able to ameliorate sepsis-induced ALI via reducing the production of ICAM and VCAM.

Based on the results obtained from the lung tissues and comparison with the information from the databases such as HMDB, we finally identified a series of biomarkers and related pathways in the treatment group versus the model group. These pathways involved purine, glutathione, sphingomyelin, arachidonic acid metabolisms, and phospholipid metabolism.

Compared with the sham group, we observed that xanthine and hypoxanthine were downregulated, and uric acid was upregulated, and XBJ treatment could reverse these conditions.

Annette et al. [23] found that, in the process of oxidative stress, the amount of xanthine oxidase would be enhanced significantly. The xanthine oxidase (XO) could break down hypoxanthine and xanthine to uric acid and release superoxide, which is consistent with our experimental result. Previous studies [25] reported that the level of uric acid in patients with infection was elevated significantly and associated with poor prognosis. In our study, XBJ alleviated oxidative stress in lung tissues after CLP. What is more, XBJ suppressed the activation of xanthine oxidase, thus increasing the level of xanthine and hypoxanthine and decreasing the level of uric acid. These results imply that XBJ could favorably affect sepsis-induced ALI via the purine metabolic pathway.

Mervyn et al. and Novelli et al. [2628] demonstrated that antioxidant depletion such as glutathione (GSH) was one of the most important characteristics in septic patients, which may ultimately lead to severe oxidative stress. Upregulation and activation of GSH could final ameliorate inflammation and histological injury of lung tissues [29]. In our study, we also observed the same phenomenon that the quantity of GSH was declined significantly, but the quantity of GSH was enhanced after XBJ treatment, indicating that XBJ may be a therapeutic option for sepsis-induced ALI through alleviating oxidative stress.

Sphingosine is a kind of bioactive lipid present in cell membranes. Previous studies [30] found that sphingosine exerted a critical role in signal transduction and participated in the process of growth, senescence, differentiation, and apoptosis. Published articles [26, 27, 29] showed that sphingolipid metabolism also played a critical role in oxidative stress. When sepsis occurs, it is in oxidative status, which causes severe cell membrane damage and sphingolipid loss. As a result, the body needs large amounts of sphingosine to compensate for the sphingolipid loss. It was found in our study that the amount of sphingosine in the model group was reduced significantly as compared with the control group, and XBJ treatment reversed this process, indicating that the sphingolipid metabolic pathway is activated in the condition of sepsis-induced ALI as the symbol of cell death.

Arachidonic acid is one of the important polyunsaturated fatty acids (PUFA) and can be biosynthesized from linoleic acid. Arachidonic acid plays a critical role in inflammatory metabolic pathways [31]. The data presented in a pilot study [32] showed that the activity of arachidonic acid metabolites persisted for several days in septic patients. What is more, arachidonic acid proved to activate anti-inflammatory cytokines and inhibit proinflammatory cytokines to prevent pulmonary injury [33].

Lysophosphatidylcholine (LPC) is a critical immunomodulator and has been reported to reduce mortality in septic mice [34]. Previous publication has shown that LPC concentrations on day 7 were significantly lower in nonsurvivors than in survivors and Smani et al. also reported the significant effect of LPC in severe infections [35, 36].

Meanwhile, previous studies illustrated the therapeutic effects of LPC in experimental sepsis, which included the effects on cytokine levels, on enhancing bacterial clearance, on neutrophil deactivation, and on increasing bactericidal activity of neutrophils [34, 37]. In this study, we also observed that most kind of LPC was increased in XBJ treatment group when compared with CLP group.

In summary, the disturbance of purine, glutathione, arachidonic acid, and sphingolipid metabolisms plays critical roles in the progress of sepsis-induced ALI, and XBJ treatment could reverse these metabolic disturbances in varying degrees. These results demonstrate that XBJ injection could relieve sepsis-induced acute lung injury via improving the condition of these 5 metabolic pathways.

However, Xuebijing injection consists of over 20 constituents, and some drug monomers such as ferulic acid and tanshinol can also eliminate oxygen free radicals and regulate lung inflammation [33, 38], so further studies are necessary to elucidate the detailed mechanism underlying the therapeutic efficacy of XBJ.

5. Conclusions

Our study demonstrated a metabonomics approach based on UHPLC/Q-TOF MS to profile the metabolic changes of sepsis-induced acute lung injury in mice and demonstrated that XBJ can alleviate sepsis-induced acute lung injury via purine, glutathione, arachidonic acid, and sphingolipid metabolisms. These pathways may be the potential therapeutic pathways to overcome sepsis-induced acute lung injury and we provided the potential mechanisms of protective effects of XBJ against ALI. However, further studies are needed for better understandings about which compounds of XBJ are involved in this pathophysiological process.

Data Availability

The data used to support the findings of this study are included within the article.

Conflicts of Interest

The authors have no conflicts of interest to declare.

Authors’ Contributions

Xuan Shi, Guannan Chen, and Juan Wei contributed equally to this work.


This study was supported in part by grants from the National Natural Science Foundation of China (81272142, 81671947, and 81871601).


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Copyright © 2018 Xuan Shi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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