Open Access

Intestinal dysbacteriosis leads to kidney stone disease

  • Authors:
    • Enyang Zhao
    • Wenfu Zhang
    • Bo Geng
    • Bosen You
    • Wanhui Wang
    • Xuedong Li
  • View Affiliations

  • Published online on: December 31, 2020     https://doi.org/10.3892/mmr.2020.11819
  • Article Number: 180
  • Copyright: © Zhao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The formation and physicochemical properties of kidney stones (KSs) are closely associated with diet. In view of the differences in ethnicity and dietary composition between Chinese and Western populations, the present study aimed to investigate the association between intestinal dysbacteriosis and KSs in China. The current study examined the differences in intestinal microbes between the KS disease (KSD) and the healthy control (HLT) groups, and statistically significant differences based on 16s rRNA gene amplicons were identified using a Student's t‑test or one‑way ANOVA. In addition, the calcium oxalate KS (COKS), uric acid KS (UAKS) and carbonate apatite KS(CCKS) groups were compared with a non‑parametric statistical test. Determination of bacterial abundance was performed via the analysis of 16s rRNA marker gene sequences using next‑generation sequencing. Firmicutes (F) and Bacteroides (B) levels were significantly higher in the KSD group compared with the HLT group (B/F=0.67 vs. 0.08; P<0.001), as were the overall levels of B (6.19‑fold higher compared with the HLT group; 22.2 vs. 3.6%; P<0.001). The Prevotella‑9 abundance levels in the KSD group were 4.65‑fold higher compared with those in the HLT group (8.8 vs. 1.9%; P<0.001). The levels of Blautia and Lachnoclostridium were significantly decreased in the KSD group (13.3 vs. 6.0%; and 5.0 vs. 7.9%; both P<0.05). Moreover, Prevotella‑9 levels were higher in non‑calciferous KSs (UAKS) compared with calciferous KSs (COKS and CCKS). Therefore, the findings of the present study indicated a key association between specific KS components and intestinal flora, providing a theoretical basis for new treatment methods for KSs. Moreover, differences and interactions between these bacteria could initially predict specific types of urolithiasis.

Introduction

Kidney stone (KS) disease (KSD) is one of the most common urological diseases. In Western countries, 5–10% of the population experience ≥1 urinary calculus episode during their lifetime (1,2). KSD is the result of metabolic disorders that occur for multiple reasons, but its exact pathogenesis remains elusive. Genetic variations, dietary habits and geographic distributions all contribute to the formation of KSs (3), with diet being an important factor. Different global regions and dietary cultures result in complex and diverse stone compositions, including calcium oxalate, calcium phosphate, calcium carbonate, cysteine and uric acid stones (2,3). The incidence of KSD may be decreased by changing to a low-protein and low-salt diet, and by increasing the intake of fruit, whole grain cereal fiber and magnesium (46).

Eating habits and types of food can directly affect intestinal micro-organisms. Numerous studies (2,3,5,715) have reported that intestinal microbes can participate in the synthesis and metabolic breakdown of molecules involved in physiological and pathophysiological processes, including short-chain fatty acids, amino acids, vitamins, neurotransmitters and hormones, amongst others (7). Changes in metabolites or the induction of the immune response due to the disruption caused by intestinal dysbacteriosis may contribute to the regulation of various diseases. For example, short-chain fatty acids secreted by intestinal bacteria affect the metabolism of foreign substances, branched-chain amino acid transport, oxidative stress and the mucin degradation mechanism that regulates obesity and diabetes (713). Overconsumption of choline or carnitine generates trimethylamine (TMA) during intestinal metabolism, which subsequently produces TMA N-oxide (TMAO). The presence of TMAO promotes platelet activation and increases the incidence of atherosclerosis (1416). Thus, blocking the intestinal TMA metabolic enzyme may significantly inhibit atherosclerotic plaque formation (15). These findings suggest that intestinal microbial disorders may be the cause of disease onset and are not only associated with disease symptoms.

Stern et al (2) used the 16s RNA method to determine the presence of intestinal microbes in 23 cases of KSs, and the levels of Bacteroides and Prevotella in the experimental group were found to be significantly increased. In addition, Suryavanshi et al (17) reported that the level of Oxalobacter in the feces was lower in the KSD group compared with that in the healthy control group (HLT), and this lower abundance was observed among patients with KSD with oxalate metabolism disorder and calcium oxalate components. These aforementioned results suggest that calcium oxalate stones in Western populations may be caused by i) a close correlation between intestinal dysbacteriosis and the incidence of KSD, and ii) low levels of Oxalobacter in the intestinal tract. Since diets differ between Chinese and Western populations, KSs exhibit marked diversity and no significant distribution characteristics, and therefore, it remains unknown whether different intestinal bacterial disorders may lead to the formation of different types of KSs. Thus, the aim of the present study was to analyze the diversity of intestinal flora in KSD and HLT subjects in northeastern China, and further analyze the variability of intestinal flora and gene abundance among patients with calcium oxalate KS (COKS), uric acid KS (UAKS) and carbonated apatite KS (CCKS), in order to investigate the association between the different types of KSs and intestinal dysbacteriosis. The findings of the present study may enable the design of KS preventive treatments by control of the intestinal flora via diet, precise medical treatment of KS and relatively cost-effective simple intestinal flora sequencing analysis paired with diet intervention.

Materials and methods

Ethics statement

The protocol of the present study was approved by the Ethics Committee of the Second Affiliated Hospital of Harbin Medical University (approval no. 2015-yan-221) and complied with the World Medical Association Declaration of Helsinki regarding ethical conduct of research involving human subjects. The study was performed in accordance with the approved local guidelines and regulations, and written informed consent was obtained from all the participants.

Patients

The study involved 91 individuals with KSD (age, 26–80 years; 48 male patients and 43 female patients), including 42 with COKS, 12 with UAKS and 18 with CCKS, and 75 HLT (age, 21–85 years; 44 male patients and 31 female patients). Stone samples were only collected from the patients who were treated with percutaneous nephrolithotomy. It was not possible to collect stone samples from the remainder of the patients who were treated with holmium laser lithotripsy. The participants provided blood samples (5 ml), urine samples (10 ml) and stool samples (using sterile cryopreserved tubes) after 6 h of fasting. The fresh samples were stored in a freezer at −80°C until analysis. All samples were collected from individuals who had not undergone gastrointestinal surgery and before the use of antibiotics. Patients with KSD included both those with newly developed and those with recurrent KSs. All stone composition types were registered. Classification of stones was based on the components with the largest proportions (18). HLT participants had not used medications over the past year, and those who had undergone gastrointestinal surgery or received antibiotics within the past 2 weeks were excluded. The samples were collected by two surgical methods, percutaneous nephrolithotomy and holmium laser lithotripsy. Stone specimens of the patients were successfully collected and stone analysis was conducted via percutaneous nephrolithotomy. However, the stone was divided into 1–2 mm size after holmium laser lithotripsy and failed to be successfully collected, which is the reason for incomplete samples.

Gut microbiome analysis

Fecal samples (100 µl) were collected in Specimen Transport Medium (Qiagen, Inc.) and microbiome DNA was extracted using two methods, with a bead-beating based PowerSoil DNA isolation kit (MO BIO Laboratories, Inc.) and a chemical-lysis based QIAamp DNA mini kit (Qiagen, Inc.), following the manufacturer's protocol. Upon finishing, the purified DNA was rinsed in 100 µl elution buffer (pH 8.0) and its concentration was measured using Qubit 2.0 (Thermo Fisher Scientific, Inc.). The microbiome DNA was PCR-amplified using barcoded primers spanning the V4 variable region of the 16s rRNA gene, as previously described (19). Barcoded PCR products from all samples were pooled at approximately equal molar DNA concentrations and sequenced on an Illumina MiSeq (Illumina Inc.) by the Albert Einstein Epigenomics Shared Facility using paired-end reads.

The short Illumina reads were processed for an operational taxonomic unit (OTU) classification according to previously described methods (2023). Compositions of microbiome communities were summarized by a proportion at the genus level.

Statistical analysis

The OTU results of all the samples in one group are presented in Fig. 1 and were based on individual OTUs. The relative levels of the species were plotted with GraphPad software (version 6; GraphPad Software, Inc.). Heatmaps were generated from the specimen and samples. Unpaired Student's t-tests were used to identify significant differences between groups. P<0.05 was considered to indicate a statistically significant difference. χ2 tests were used to compare the main intestinal flora types between the KSD and HLT groups.

To determine the major intestinal flora types in the experiment and control groups, age, sex, presence of diabetes mellitus (DM) and body mass index (BMI) were added to the independent logistic regression model of KSD associated with Bacteroides, Pseudomonas and Blautia. Unpaired Student's t-tests were also used to compare the mean abundance levels of Bacteroides, Pseudomonas and Blautia with DM, hypertension and BMI. A non-parametric test was used to compare the COKS, UAKS and CCKS groups. An unpaired two-tailed Student t-test was used to compare the difference between two groups. One-way ANOVA followed by Tukey's post hoc test was used for multiple comparisons. The statistical methods used in Table III were ANOVAs (one-way) and post hoc Tukey's tests. All examinations were bilateral (P<0.05). Data were statistically analyzed using SPSS v.20 (IBM Corp.).

Table III.

Clinical characteristics of the COKS, UAKS and CCKS stone groups.

Table III.

Clinical characteristics of the COKS, UAKS and CCKS stone groups.

VariableCOKSUAKSCCKSP-value
Age, years56.4±10.646.0±4.855.7±13.60.043
Sex 0.034
  Female  9615
  Male336  3
BMI24.7±2.828.8±4.724.1±2.80.223
Urine pH5.7±0.66.1±1.06.9±0.60.434
Biochemical index
  Ca2.33±0.112.25±0.112.20±0.120.328
  P1.10±0.161.04±0.151.17±0.120.651
  Mg0.99±0.071.36±0.641.02±0.070.448
  TC7.76±5.365.05±1.324.68±1.830.292
  TG3.33±2.043.52±1.342.30±2.420.151
  HDL1.44±0.371.02±0.241.29±0.530.471
  LDL3.02±1.172.31±0.242.65±1.080.252
  CRP7.25±9.214.77±3.978.41±7.810.439

[i] Data are presented as the n or mean ± SD. Comparisons were made using ANOVAs (one-way) and post hoc Tukey's tests. Bold values indicate statistical significance (P<0.05). COKS, calcium oxalate kidney stones; UAKS, uric acid kidney stones; CCKS, carbonated apatite kidney stones; TC, serum total cholesterol; TG, triglyceride; HDL, high-density lipoprotein; LDL, low-density lipoprotein; CRP, C-reactive protein.

Results

KSD and intestinal dysbacteriosis

Fecal samples were collected from 91 patients with KSD and 75 HLT subjects (patient information is presented in Table I). A total of 178 genera were identified by 16s rRNA sequencing, and the top 10 bacteria with the highest levels were statistically analyzed. At the phylum level, the abundance of Firmicutes and Bacteroides was highest in the KSD group. Moreover, the HLT group exhibited higher abundance levels of Actinobacteria (Fig. 1A and B). At the genus level, the abundance of Bacteroides and Prevotella-9 was highest in the KSD group, accounting for 31% of all bacteria present. The abundance of Bacteroides in the KSD group was higher compared with that in the HLT group (22.2 vs. 3.6%; P<0.001). The Prevotella-9 abundance was 4.65-fold higher in the KSD group compared with that in the HLT group (8.8 vs. 1.9%; P<0.001). The two bacteria with the highest levels in the HLT group were Blautia and Lachnoclostridium, accounting for 21% of total bacteria (Fig. 1C; Table II). The Blautia abundance was 2.12-fold higher in the HLT group compared with the KSD group (13.4 vs. 6.0%; P<0.001). The abundance of Lachnoclostridium was 1.58-fold higher in the HLT group compared with the KSD group (8.0 vs. 5.0%; P=0.013 Fig. 1C; Table II). High abundance of Prevotella-9 (OR=3.78; P<0.001) and Blontia (OR=−3.04, P=0.002), and low abundance of Bacteroides (OR=6.86; P<0.001) were independent influencing factors in the KSD group according to multivariate analysis (Table II).

Table I.

Key characteristics of the KSD and HLT groups.

Table I.

Key characteristics of the KSD and HLT groups.

VariableKSDHLTP-value
Age, years56.3±11.457.0±13.30.695
Sex 0.445
  Female4331
  Male4844
BMI24.7±3.425.1±4.10.419
Comorbidities
  DM11±1210±130.810
  HTN23±2523±300.210

[i] Data are presented as the n or mean ± SD. Comparisons were made using χ2 and Student's t-test. KSD, kidney stone disease; HLT, healthy control; BMI, body mass index; DM, diabetes mellitus; HTN, hypertension.

Table II.

Top ten differences of intestinal flora (abundance, %) between KSD and HLT groups at the genus level.

Table II.

Top ten differences of intestinal flora (abundance, %) between KSD and HLT groups at the genus level.

GenusCaseControlP-value
Bacteroides0.222±0.1830.036±0.057 <0.001
Enterococcus0.036±0.1040.024±0.0990.474
Prevotella_90.088±0.1520.019±0.069 <0.001
EscherichiaShigella0.057±0.0970.049±0.1040.623
Megamonas0.023±0.0540.018±0.0740.633
Lachnoclostridium0.050±0.0430.080±0.0940.013
Blautia0.060±0.0640.134±0.072 <0.001
Bifidobacterium0.022±0.0500.041±0.0720.043
Pseudobutyrivibrio0.060±0.0710.066±0.0630.530
Faecalibacterium0.067±0.0650.070±0.0630.721

[i] Data are presented as the mean ± SD. Comparisons were made using Student's t-test. Bold values indicate statistical significance (P<0.05). KSD, kidney stone disease; HLT, healthy control.

Different types of intestinal dysbacteriosis are associated with different types of KSs

Among the COKS, UAKS and CCKS groups, female morbidity was highest in the CCKS group (n=5; P=0.034; Table III). The classification of stones was based on the components with the largest proportion (18). The majority of the enrolled patients had a urinary tract infection when they were hospitalized, but urea-positive bacteria were not found in clinical urine bacterial culture. The abundance of Firmicutes (56.4 vs. 30.4%; P=0.029) and Bacteroides (36.2 vs. 62.6%; P=0.009) differed significantly between the COKS and UAKS groups. In the CCKS and UAKS groups, there were significant differences in the abundance levels of Firmicutes (59.5 vs. 30.4%; P=0.014) and Bacteroidetes (31.5 vs. 62.6%; P=0.006). There was no significant difference in the abundance of Firmicutes (56.4 vs. 59.5%; P>0.05) and Bacteroides (36.2 vs. 31.5%; P>0.05) between the COKS and CCKS groups (Fig. 2).

Among COKS, UAKS and CCKS groups, Prevotella had the highest abundance in the UAKS group, Pseudobutyrivibrio and Lachnoclostridium had the highest abundance in the COKS group, and Ruminococcus-2 had the lowest abundance in the UAKS group (Fig. 3). Moreover, no significant differences in the abundance of bacteria were identified between the COKS and CCKS groups containing calcium (all P>0.05; Fig. 4). The Prevotella abundance levels differed between the non-calcium-containing UAKS and the calcium-containing COKS and CCKS groups (32.2 vs. 8.6 and 2.0%, respectively; all P<0.005; Fig. 4). In addition, there were differences in abundance levels between the COKS and the UAKS groups for Pseudobutyrivibrio, Lachnoclostridium, Ruminococcus and Fusicatenibacter (7.7 vs. 2.9%, 4.5 vs. 1.9%, 1.4 vs. 0.2% and 1.2 vs. 0.6%, respectively; all P<0.05; Fig. 4). There were differences between the three species of Anaerotruncus, Tyzzerell-4 and Turicibacter, but the abundance level was very low (data not shown).

The differences in gastrointestinal flora were analyzed and compared between men and women (Table IV). There were no statistically significant differences in gastrointestinal flora between the KSD and the HLT groups under the phylum level classification (all P>0.05; data not shown). Under the genus classification, significant differences were observed in the KSD groups between men and women. Statistically significant differences were identified among Collinsella, Peptostreptococcus, Sutterella, Barnesiella, Peptococcus, Senegalimassilia, Butyricimonas, Bilophila, Ruminiclostridium-9, Coprobacter, Mogibacterium and Cupriavidus (all P<0.05; Table IV). The abundance levels of Collinsella (0.7 vs. 0.2%; P=0.031), Sutterella (0.3 vs. 0.1%; P=0.028) and others (data not shown) were very low. In the HLT group, there were significant differences among unidentified-Lachnospiraceae, Paraprevotella, Haemophilus, Sphingomonas, Ruminiclostridium-1, Streptomyces, Johnsonella and Acholeplasma (all P<0.05; Table IV), but the abundance levels were very low (data not shown).

Table IV.

Sex differences in KSD groups (male, n=48; female, n=43) and HLT groups (male, n=44; female, n=31) under genus classification.

Table IV.

Sex differences in KSD groups (male, n=48; female, n=43) and HLT groups (male, n=44; female, n=31) under genus classification.

A, KSD groups

TaxonomyMaleFemaleP-value
Collinsella427.631±946.67 115.771±226.5480.031
Peptostreptococcus2.501±5.7720.491±0.8830.021
Sutterella84.771±132.766 207.531±334.1350.028
Barnesiella24.150±59.53288.811±169.6500.022
Peptococcus1.791±3.1750.671±1.7960.040
Senegalimassilia4.171±9.9240.951±2.6630.035
Butyricimonas9.001±14.38827.441±55.4550.040
Bilophila11.351±12.79028.491±46.6080.024
Ruminiclostridium-915.311±19.33333.811±46.3210.018
Coprobacter   2.981±8.72112.001±26.2650.037
Mogibacterium0.331±0.7530.051±0.2130.014
Cupriavidus0.081±0.2790.001±0.0000.044

B, HLT groups

TaxonomyMaleFemaleP-value

unidentified-Lachnospiraceae19.141±29.89049.190±79.6440.049
Paraprevotella23.720±44.7676.441±6.7300.016
Haemophilus28.741±72.8854.130±5.7800.033
Sphingomonas0.261±0.6580.031±0.1770.038
Ruminiclostridium-10.140±0.3510.001±0.0000.013
Streptomyces0.231±0.6110.001±0.0000.017
Johnsonella0.161±0.4330.001±0.0000.018
Acholeplasma0.121±0.3240.001±0.0000.024

[i] The minimum measured abundance value was 1. Comparisons were made using χ2 test and Student's t-test. Bold values indicate statistical significance (P<0.05). KSD, kidney stone disease; HTL, healthy control.

Discussion

The composition of KSs is complex and diverse, and pathogenic mechanisms are affected by multiple factors, with diet being the most important factor affecting the formation of KSs (46,24,25). The differences in ethnicity and dietary structure markedly affect the composition and function of intestinal ecosystems (2629). The present study demonstrated that patients with KSs had intestinal dysbacteriosis, and Oxalobacter levels were upregulated in patients with COKS. However, the prevalence of specific bacteria was not obvious among other patients with KSD. The present study analyzed the differences in gastrointestinal bacteria among patients with KSD, and performed further comparative analyses of bacterial abundance and the specific composition of KSs.

The mechanism of KS formation is complex. A variety of stone compositions contribute to metabolic regulation under control of the susceptibility gene (30). Similar to other researchers (46,25), the present results suggested that diet was one of the most important factors affecting the formation of kidney stones. Endogenous and exogenous oxalic acid metabolic disorders lead to formation of COKS, with Oxalobacter being one of the most important contributors (17). Few studies have reported other types of bacteria causing gastrointestinal disorders to be involved in KS formation.

It was hypothesized that the abnormal changes in metabolic products and bacterial intestinal colonization may trigger mucosal immune inflammation mechanisms, which may cause further changes in the body's renal function when intestinal dysbacteriosis is present. When the levels of the components of kidney stones increases, renal tubular epithelial injury, inflammatory responses and calculus susceptibility gene regulation occur, eventually leading to KS formation (31,32).

The high incidence and recurrence of KSD may be closely associated with ethnicity and diet; thus, it is important to investigate changes in intestinal dysbacteriosis (33). In the present study, the abundance of Bacteroides and Prevotella in the KSD group was significantly higher compared with that in the HLT group (6.1- and 4.6-fold, respectively). The trend of the obtained results was consistent with that reported by Stern et al (2) (6.1- vs. 3.4-fold and 4.6- vs. 2.8-fold, respectively), and variations may be due to differences in ethnicity and dietary cultures of the patients recruited. In addition, Lachnoclostridium, Blautia and Bifidobacterium were 1.5-, 2.1- and 1.9-fold higher, respectively, in patients compared with the HLT group.

The differences between the CCKS, UAKS and COKS groups were further analyzed. No lower abundance levels of Oxalobacter were found in the KSD group when compared with the HLT group, which was consistent with the findings of Suryavanshi et al (17). However, in the present study, statistically significant differences in the levels of Oxalobacter between these two groups were not observed, but there were significant differences in Prevotella-9 abundance between the calcium-containing COKS and CCKS groups and the non-calcium-containing UAKS group. Prevotella-9 is positively correlated with serum uric acid levels, while UAKS are a product of metabolic disorders of uric acid (34). Thus, it was suggested that abnormally high abundance of Prevotella-9 may lead to the formation of uric acid stones. However, it should be noted that Stern et al (2) did not identify any significant differences in bacteria when comparing uric acid and non-UAKS, which may be attributed to the daily high-fiber diet of the study population. Additionally, in the present study, differences were observed in the abundance levels of Pseudobutyrivibrio, Lachnoclostridium and Ruminococcus 2 between the COKS and UAKS groups, all of which belong to the Helicobacter pylori family. One of the major metabolites is short-chain fatty acids, which participates in the metabolism (35) and inflammatory responses of the body (36,37). It was hypothesized that the bacteria present in intestinal dysbacteriosis may interfere with the body's normal inflammatory response and material metabolism via uric acid short-chain fatty acid metabolic disorders, which ultimately lead to calcium and UAKS formation in the kidney.

In general, the composition of intestinal microbiota changes according to age, diet and drug use, and differs across ethnicities and geographic regions (2,3,5,8,17). Loss of Oxalobacter formigeneses is hypothesized to be a factor that produces COKS, as Oxalobacter formigeneses metabolizes oxalate in the intestine; however, several studies, including the present, question the validity of this hypothesis (2,38). The mechanism underlying the formation of calculi has yet to be fully elucidated. Further extensive basic research and clinical data are required for confirmation. Although individuals residing in the same area tend to consume similar foods, individual dietary variations also affect the statistical results (4,6). The present study randomly recruited participants in both the KSD and HLT groups. The stones collected were mostly of mixed composition. The main stone composition was based on infrared spectrum analysis. The participants did not strictly control their daily diets in the present study. Since some patients opted for holmium laser lithotripsy and some did not agree to undergo stone composition analysis, and thus, there was an insufficient number of patients in the COKS, UAKS and CCKS groups to establish statistical significance.

In conclusion, the present study indicated a key association between specific KS components and intestinal flora, providing a theoretical basis for novel treatment strategies for KSs. Moreover, the results of the present study indicated that differences and interactions between bacteria might predict specific types of urolithiasis.

Acknowledgements

Not applicable.

Funding

The present study was supported by the National Natural Science Foundation of Heilongjiang Province (grant no. H201407).

Availability of data and materials

All data generated or analyzed during this study are included in this published article.

Authors' contributions

XL was responsible for designing the experiments, and analyzing and interpreting the data. EZ was responsible for compiling articles, performing the experiments and analyzing the data. WZ, BG, BY and WW collected clinical specimens and interpreted the data. All authors read and approved the final manuscript.

Ethics approval and consent to participate

The protocol of the present study was approved by the Ethics Committee of the Second Affiliated Hospital of Harbin Medical University (approval no. 2015-yan-221) and complied with the World Medical Association Declaration of Helsinki regarding ethical conduct of research involving human subjects. The study was performed in accordance with the approved local guidelines and regulations, and written informed consent was obtained from all the participants.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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March-2021
Volume 23 Issue 3

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Spandidos Publications style
Zhao E, Zhang W, Geng B, You B, Wang W and Li X: Intestinal dysbacteriosis leads to kidney stone disease. Mol Med Rep 23: 180, 2021
APA
Zhao, E., Zhang, W., Geng, B., You, B., Wang, W., & Li, X. (2021). Intestinal dysbacteriosis leads to kidney stone disease. Molecular Medicine Reports, 23, 180. https://doi.org/10.3892/mmr.2020.11819
MLA
Zhao, E., Zhang, W., Geng, B., You, B., Wang, W., Li, X."Intestinal dysbacteriosis leads to kidney stone disease". Molecular Medicine Reports 23.3 (2021): 180.
Chicago
Zhao, E., Zhang, W., Geng, B., You, B., Wang, W., Li, X."Intestinal dysbacteriosis leads to kidney stone disease". Molecular Medicine Reports 23, no. 3 (2021): 180. https://doi.org/10.3892/mmr.2020.11819