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In this study, a high-performance liquid chromatography method was established to simultaneously determine three flavonoids including hesperidin (HES), nobiletin (NOB) and tangeretin (TAN) in 10 batches of Citrus reticulata 'Chachi' planted and collected in Xinhui District, Jiangmen City, Guangdong Province. Moreover, we studied the metabolism and transformation of three flavonoids in liver and intestinal flora in vitro, and sequenced 16S rRNA of bacteria flora samples after incubation. The RP-HPLC system consisted of Alltima C18 column (250 mm × 4.6 mm, 5 μm) and a mobile phase of water (A) - methanol (B). The column temperature was 25 ℃ and the detection wavelength was both 283 nm and 330 nm while the flow rate was 1.0 mL·min-1. The results showed that the retention time of HES, NOB and TAN ranged from 12.313 min to 34.271 min. The content of HES, NOB and TAN in 10 batches of Citrus reticulata 'Chachi' was 26.81-39.80 mg·g-1, 4.06-7.90 mg·g-1 and 1.81-3.93 mg·g-1, respectively. There were differences in the content of flavonoids in different batches and growing areas. The three flavonoids were metabolized in various degrees after incubation of rat and human liver S9, cytosol, microsomes or intestinal flora in vitro, especially HES. The results of 16S rRNA showed that the main flavonoids of Citrus reticulata 'Chachi' could regulate lipid metabolism by regulating intestinal flora related to energy metabolism. This study established a rapid, simple, reproducible and stable quantitative analysis method for detecting the main flavonoids in Citrus reticulata 'Chachi' which evaluated the content of flavonoids from Citrus reticulata 'Chachi' in different growing areas and different storage periods. The intestinal bacteria can metabolize and transform the flavonoids of Citrus reticulata 'Chachi' to varying degrees, which provides a valuable scientific basis for the subsequent study on the material basis of the efficacy of Citrus reticulata 'Chachi' from the perspective of metabolism. Animal experiments were approved by the Medical Ethics Committee of Guangdong Jiangmen Chinese Medicine College (No. 20190419).
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Abstract@#Gut flora undergoes a dynamic colonization and development process at different stages of human life. Sex specific gut flora development begins during puberty, which is influenced by sex hormone levels. The potential relationship between sex hormone levels, which suggests that there may be a two way interaction between intestinal flora and sex hormones. In addition, evidence is emerging for bidirectional effects of the microbiome in human health. Therefore, the review presents the dimorphism of intestinal flora, the characteristics of intestinal flora during puberty and the latest research progress, explores the close relationship between intestinal flora and precocious puberty and reproductive system diseases, and further explains the influence mechanism and treatment measures of considering gender factors in intestinal microflora, precocious puberty and reproductive system related diseases.
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High cholesterol is one of the important factors inducing cardiovascular and cerebrovascular diseases. Drug therapy is the main method for reducing cholesterol, but has the disadvantages such as high cost and side effects. Studies have shown that intestinal bacteria play important roles in cholesterol metabolism. However, there are few reports on the screening and functional evaluation of cholesterol-lowering intestinal bacteria. In this study, 36 bile-tolerant bacteria were screened from healthy people stool through culturomics using bovine bile acid or artificial mixed bile acids as substrates. Taking Lactobacillus rhamnosus GG (LGG) as a positive control, three bile acid concentration groups (0 g/L, 0.3 g/L, 3 g/L) were set up to evaluate the cholesterol-lowering ability of bile-tolerant bacteria in vitro. Ten bacteria (including Proteus mirabilis, Providencia stuartii, Proteus vulgaris et al) were identified as the dominant cholesterol-lowering bacteria. Six of the above bacteria, Proteus mirabilis, Providencia stuartii, Proteus vulgaris, Proteus penneri, Wohlfahrtiimonas chitiniclastica, Providencia rettger, were evaluated for their ability to reduce triglycerides in vitro and tolerance to artificial gastric juice. Comparing with strain LGG, the six bacteria showed better triglyceride-lowering ability in vitro. With the decrease of pH value of artificial gastric juice and the increase of treatment time, the survival rate of six bacteria decreased. The above screening experiments and functional evaluation provide a basis for further development of potential cholesterol-lowering bacterial products.
Subject(s)
Animals , Cattle , Humans , Cholesterol , Gammaproteobacteria , Proteus mirabilis , ProvidenciaABSTRACT
Intestinal bacteria interact closely with human health and diseases. With the development of high-throughput sequencing technologies, researchers have discovered the potential of intestinal bacteria in the diagnosis and treatment of diseases. Meanwhile, synthetic biology strategies are applied to engineer these bacteria for clinical applications. These engineered intestinal microbial are constructed by designing editing tools and feedback loops to gain functions of diagnose or targeted therapy. Consequently, these engineered bacteria are capable of sensing, calculating and responding to the environment. In this review, we summarize the recent advances in engineered intestinal bacteria in disease diagnosis and treatment. Furthermore, we also discuss the current status and future prospect of the engineered intestinal bacteria regarding their clinical applications, market, and safety issues.
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Humans , Bacteria , High-Throughput Nucleotide Sequencing , Synthetic BiologyABSTRACT
The aim of this study was to investigate the effect of Jujubae Fructus (JF) on the gastrointestinal toxicity and diuretic effect of Crotonis Semen Pulveratum (CT). Forty-eight mice were randomly divided into the control group, low dose of CT group (0.039 g·kg-1·d-1, CTL), high dose of CT group (0.078 g·kg-1·d-1, CTH), JF group (9.75 g·kg-1·d-1), low dose of CT combined with JF group (CT 0.039 g·kg-1·d-1 and JF 9.75 g·kg-1·d-1, JFCTL), high dose of CT combined with JF group (CT 0.078 g·kg-1·d-1 and JF 9.75 g·kg-1·d-1, JFCTH). On the 9th day of oral administration, the urine output of all mice was measured. After oral administration for ten days, fresh fecal samples were collected, and the 16S rDNA sequencing method was used to study the changes of intestinal bacteria when CT used alone and combined with JF. All experimental protocols were approved by the Animal Ethics Committee of Nanjing University of Chinese Medicine. The results showed that JF slowed down the rapid diuretic effect of CT, and significantly increased serum interleukin-2 (IL-2), interleukin-6 (IL-6), gastrin (GAS), somatostatin (SS). JF also reduced small intestine injury and improved the disorder of intestinal flora caused by CT. Low dose CT combined with JF significantly decreased the relative abundance of Sphingomonas and Oscillospira. The level of Bilophila was decreased after the combined application of high dose CT and JF. The results suggest that JF exhibited a tendency to reduce the toxicity of CT in the aspects of serum immune index, intestinal movement, intestinal damage, and intestinal microflora structure. In addition, the JF could also slow down the rapid diuretic effect of CT, behaving a tendency to reduce the clinical effect of CT.
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Akkermansia muciniphila (A. muciniphila) is a normal flora of human gastrointestinal tract. The A. muciniphila abundance of intestinal flora in obese patients is significantly decreased. Many evidences suggest that A. muciniphila is negatively related to obesity, diabetes, cardiovascular diseases and low-grade inflammation. A. muciniphila not only plays a metabolic protective role by protecting the integrity of intestinal epithelial cells and mucus layer, but also plays an anti-inflammatory role by regulatory T cells, endogenous cannabinoid system and non-classical Toll-like receptor in the process of inflammatory reaction. This article reviews the relationship between A. muciniphila and obesity, and the molecular mechanism and application of A. muciniphila in obesity.
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Objective To evaluate the efficacy and safety of fecal microbiota transplantation for radiation intestinal injury.Methods Retrospective analysis of the clinical data of 32 radiation intestinal injury patients including 6 males and 26 females,aged (59.4 ± 9.5) years,with an age range of 51-86 years who underwent fecal microbiota transplantation from August 2017 to August 2018 in the Intestinal Microenvironment Treatment Centre,Tenth People's Hospital of Tongji University was performed.The efficacy (cure rate,improvement rate),nutritional indicators (body weight,albumin,hemoglobin),inflammation index (C-reactive protein),gastrointestinal quality of life index score and adverse events were compared after 1 year of fecal microbiota transplantation.The patients were followed up for 1 year by telephone,outpatient and network.The follow-up was carried out in combination with the above-mentioned effectiveness and safety indicators.The time was until August 2019.The measurement data were expressed as mean ± standard deviation (Mean ± SD),the count data were expressed as percentage.The paired t test was used for comparison between groups.Results The clinical cure rate and clinical improvement rate of patients who received fecal microbiota transplantation for 1 year were 56.3％ and 15.6％,respectively.Body weight increased from pre-treatment (53.7 ± 9.6) kg to (60.8 ± 2.1) kg after 1 year of fecal microbiota transplantation,albumin increased from pre-treatment (30.7 ± 4.6) g/L to (37.5 ± 3.8) g/L after 1 year of fecal microbiota transplantation,and hemoglobin increased from pre-treatment (108.5 ± 13.1) g/L to (123.3 ± 13.4) g/L after 1 year of fecal microbiota transplantation.C-reactive protein decreased from pre-treatment (24.1 ±4.5) mg/L to (3.2 ±4.5) mg/L after 1 year of fecal microbiota transplantation.Gastrointestinal quality of life index scores were significantly increased after fecal microbiota transplantation,from (88.4 ± 7.1) scores to (112.2 ± 3.2) scores after 1 year of fecal microbiota transplantation.No serious adverse events occurred during the whole follow-up.The difference was statistically significant (P ＜ 0.05).Conclusions Fecal microbiota transplantation techndogy is effective and safe for radiation intestinal injury patients,which is worthy of clinical research.
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The mass spectrometry-based metabolomics method was used to systematically investigate the formation of celastrol metabolites,and the effect of celastrol on endogenous metabolites. The mice plasma,urine and feces samples were collected after oral administration of celastrol. Ultra-high performance liquid chromatography with quadrupole time-of-flight mass spectrometry( UPLC-QTOF-MS) was applied to analyze the exogenous metabolites of celastrol and its altered endogenous metabolites. Mass defect filtering was adopted to screen for the exogenous metabolites of celastrol. Multivariate statistical analysis was used to identify the endogenous metabolites affected by celastrol. Celastrol and its eight metabolites were detected in urine and feces of mice,and 5 metabolites of them were reported for the first time. The hydroxylated metabolites were observed in the metabolism of both human liver microsomes and mouse liver microsomes. Further recombinant enzyme experiments revealed CYP3 A4 was the major metabolic enzyme involved in the formation of hydroxylated metabolites. Urinary metabolomics revealed that celastrol can affect the excretion of intestinal bacteria-related endogenous metabolites,including hippuric acid,phenylacetylglycine,5-hydroxyindoleacetic acid,urocanic acid,cinnamoylglycine,phenylproplonylglycine and xanthurenic acid. These results are helpful to elucidate the metabolism and disposition of celastrol in vivo,and its mechanism of action.
Subject(s)
Animals , Humans , Mice , Chromatography, High Pressure Liquid , Mass Spectrometry , Metabolomics , Microsomes, Liver , Metabolism , Triterpenes , Metabolism , PharmacokineticsABSTRACT
Objective@#To evaluate the efficacy and safety of fecal microbiota transplantation for radiation intestinal injury.@*Methods@#Retrospective analysis of the clinical data of 32 radiation intestinal injury patients including 6 males and 26 females, aged (59.4±9.5) years, with an age range of 51-86 years who underwent fecal microbiota transplantation from August 2017 to August 2018 in the Intestinal Microenvironment Treatment Centre, Tenth People′s Hospital of Tongji University was performed. The efficacy (cure rate, improvement rate), nutritional indicators (body weight, albumin, hemoglobin), inflammation index (C-reactive protein), gastrointestinal quality of life index score and adverse events were compared after 1 year of fecal microbiota transplantation. The patients were followed up for 1 year by telephone, outpatient and network. The follow-up was carried out in combination with the above-mentioned effectiveness and safety indicators. The time was until August 2019. The measurement data were expressed as mean±standard deviation (Mean±SD), the count data were expressed as percentage. The paired t test was used for comparison between groups.@*Results@#The clinical cure rate and clinical improvement rate of patients who received fecal microbiota transplantation for 1 year were 56.3% and 15.6%, respectively. Body weight increased from pre-treatment (53.7 ± 9.6) kg to (60.8 ± 2.1) kg after 1 year of fecal microbiota transplantation, albumin increased from pre-treatment (30.7±4.6) g/L to (37.5±3.8) g/L after 1 year of fecal microbiota transplantation, and hemoglobin increased from pre-treatment (108.5±13.1) g/L to (123.3±13.4) g/L after 1 year of fecal microbiota transplantation. C-reactive protein decreased from pre-treatment (24.1±4.5) mg/L to (3.2±4.5) mg/L after 1 year of fecal microbiota transplantation. Gastrointestinal quality of life index scores were significantly increased after fecal microbiota transplantation, from (88.4±7.1) scores to (112.2±3.2) scores after 1 year of fecal microbiota transplantation. No serious adverse events occurred during the whole follow-up. The difference was statistically significant (P<0.05).@*Conclusions@#Fecal microbiota transplantation techndogy is effective and safe for radiation intestinal injury patients, which is worthy of clinical research.
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OBJECTIVE: To detect the level of fecal primary and secondary bile acids in infants with infantile cholestatic hepatopathy(ICH)and analyze its clinical value. METHODS: Thirty infants with ICH were enrolled in this study,who were diagnosed with infantile cholestatic hepatopathy. Thirty infants with good health condition were enrolled as the healthy control group. The fecal samples were collected respectively in the preparatory treatment phase and treatment phase from infants with ICH and from the healthy infants. Bile acids were extracted from infants' feces and were quantitatively analyzed by liquid chromatography-mass spectroscopy. RESULTS: Among the fecal primary bile acids,the level of cholic acid,chenodeoxycholic and glycochenodeoxycholic acid both in the ICH preparatory treatment group and ICH treatment group was significantly lower than that in the healthy control group(P<0.016).The level of fecal cholic acid and chenodeoxycholic acid of ICH treatment group was higher than in the ICH preparatory treatment group(P<0.016).Among the fecal secondary bile acids,the level of lithocholic acid both in the ICH preparatory treatment group and ICH treatment group was significantly lower than that in the healthy control group(P<0.016),and the level of ursodeoxycholic acid in the ICH preparatory treatment group was lower than that in the ICH treatment group and healthy control group(P<0.016). CONCLUSION: In infants with ICH, the changes of fecal primary bile acids and fecal secondary bile acids have their own characteristics at the early stage of treatment, which may be caused by the short-term treatment,the prognosis of the disease itself and the changes of intestinal function, including intestinal bacteria. Clinical attention should be paid to these changes.
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Objective To investigate the community structure of intestinal bacteria from patients with cirrhosis and its influencing factors. Methods From 2016 to 2017, 24 patients with liver cirrhosis ( the LC group) and 23 healthy family members of patients ( the HC group) were enrolled at the First Hospital of Lanzhou University. A comparative analysis of the community structure of intestinal bacteria was performed using 16S rRNA gene sequencing in LC and HC groups. Combined with LEfSe analysis and NMDS analysis, the differential markers were screened and the factors affecting the intestinal community structure of subjects were studied. Results The dominant six phylum of bacteria in intestines in LC and HC groups included Firmicutes, Bacteroides, Proteobacteria, Actinobacteria, Fusobacteria and Tenericumes. However, in the LC sample, Firmicutes was significantly reduced, while Bacteroides was significantly increased. The diversity of intestinal bacteria was significantly reduced, and the Firmicutes/Bacteroides ratio was significantly decreased, suggesting a variation of the community structure in intestinal bacteria of cirrhosis patients. The LEfSe result indicated that the abundance of Enterococcus, Lactobacillales, Bacilli, and Bacteroidetes showed a significant difference in the LC sample, which may be used as potential marked bacterial groups for cirrhosis. The NMDS analysis revealed a positive relationship between the concentration of Cd and Pb and the abundance of intestinal bacteria in the LC sample. Conclusion The community structure of intestinal bacteria from patients with cirrhosis has changed. Enterococcus, Lactobacillales, Bacilli, and Bacteroidetes are potential marked bacterial groups. The concentration of Cd and Pb in the intestinal tract of cirrhosis patients may interact with the abundance and structure of bacteria, and further affect the occurrence and development of cirrhosis.
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Poliumoside is representative of phenylethanoid glycosides, which are widely found in many plants. Poliumoside is also regarded as the main active component of Callicarpa kwangtungensis Chun (CK), though its oral bioavailability in rat is extremely low (0.69%) and its in vivo and in vitro metabolism has not yet been systematically investigated. In the present study, an ultra performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UPLC/Q-TOF-MS) method was employed to identify the metabolites and investigate the metabolic pathways of poliumoside in rat after oral administration 1.5 g·kg of poliumoside. As a result, a total of 34 metabolites (30 from urine, 17 from plasma, and 4 from bile) and 9 possible metabolic pathways (rearrangment, reduction, hydration, hydrolyzation, dehydration, methylation, hydroxylation, acetylation, and sulfation) were proposed in vivo. The main metabolite, acteoside, was quantified after incubated with rat intestinal bacteria in vitro. In conclusion, the present study systematically explored the metabolites of poliumoside in vivo and in vitro, proposing metabolic pathways that may be significant for further metabolic studies of poliumoside.
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Animals , Male , Rats , Administration, Oral , Bacteria , Metabolism , Bile , Chemistry , Caffeic Acids , Blood , Chemistry , Urine , Callicarpa , Chemistry , Chromatography, High Pressure Liquid , Drugs, Chinese Herbal , Chemistry , Metabolism , Glycosides , Blood , Chemistry , Urine , Intestines , Microbiology , Mass Spectrometry , Methods , Molecular Structure , Plasma , Chemistry , Rats, Sprague-Dawley , Urine , ChemistryABSTRACT
Objective • To construct bacterial signatures by analyzing fecal metagenomics for the screening and diagnosis of colorectal cancer (CRC). Methods • A total of 285 samples were included in the study. Diagnostic models for CRC according to six different machine learning algorithms were developed using the featured bacteria selected by random forest algorithm, and validated in validation sets. Results • Nine bacteria that differentiated CRC and the control were identified, with which 6 models were established. The best model was random forest model, with an accuracy of 0.847 7 in the training set. Its accuracy in two test sets was 0.815 8 and 0.734 4, respectively. The area under curve (AUC) of receiver operating characteristic of the random forest model in the set including all samples was 0.894. Conclusion • Bacterial signatures based on random forest algorithm for the diagnosis of CRC can differentiate patients with CRC and the control effectively, which suggests the potential clinical value of the bacterial signatures.
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Human intestinal bacteria play an important role in the metabolism of herbal medicines, leading to the variations in their pharmacological profile. The present study aimed to investigate the metabolism of Xiao-Cheng-Qi decoction (XCQD) by human intestinal bacteria and to discover active component combination (ACC) contributing to the anti-inflammatory activity of XCQD. The water extract of XCQD was anaerobically incubated with human intestinal bacteria suspensions for 48 h at 37 °C. A liquid chromatography-hybrid quadrupole time-of-flight mass spectrometry (LC-Q-TOF/MS) method was performed for identification of the metabolites. In addition, the anti-inflammatory effects of XCQD and biotransformed XCQD (XCQD-BT) were evaluated in vitro with cytokines in RAW264.7 cells induced by lipopolysaccharide (LPS). A total of 51 compounds were identified in XCQD and XCQD-BT. Among them, 20 metabolites were proven to be transformed by human intestinal bacteria. Significantly, a combination of 14 compounds was identified as ACC from XCQD-BT, which was as effective as XCQD in cell models of inflammation. In conclusion, this study provided an applicable method, based on intestinal bacterial metabolism, for identifying combinatory compounds responsible for a certain pharmacological activity of herbal medicines.
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Animals , Humans , Mice , Anti-Inflammatory Agents , Pharmacology , Therapeutic Uses , Bacteria , Metabolism , Biotransformation , Cytokines , Metabolism , Drugs, Chinese Herbal , Chemistry , Metabolism , Feces , Microbiology , Gastrointestinal Microbiome , Inflammation , Drug Therapy , Lipopolysaccharides , Pharmacology , Macrophages , Metabolism , Models, Biological , Molecular StructureABSTRACT
The study was based on the toxic characteristics of the compatibility between "Zaojisuiyuan" and Gancao, with intestinal tract and intestinal bacteria as subject. From the angle of intestinal barrier function, motor function, steady state of intestinal flora and metabolism genes, the toxic and side effects of the compatibility between Qianjinzi and Gancao with similar properties, bases and chemical composition and types were further explored. The results showed that the combined application of Qianjinzi and Gancao enhanced intestinal mucosa damage, and led to abnormal changes in intestinal bacteria structure and metabolic function. It improved the degradation functions of mucus and aromatic amino acids on intestinal bacteria, which may increase the risk of disease and derived from intestinal urotoxin and other toxic substances. This study considered intestinal bacteria as an important target to study the interactions of traditional Chinese medicine. The "drug-intestinal bacteria-metabolism-toxicity" was applied in the experiment. Meanwhile, it provides ideas for exploring incompatible mechanism of traditional Chinese medicines.
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Animals , Drugs, Chinese Herbal , Pharmacology , Gastrointestinal Microbiome , Glycyrrhiza uralensis , Chemistry , Intestinal Mucosa , Pathology , Medicine, Chinese TraditionalABSTRACT
Human intestinal bacteria play an important role in the metabolism of herbal medicines, leading to the variations in their pharmacological profile. The present study aimed to investigate the metabolism of Xiao-Cheng-Qi decoction (XCQD) by human intestinal bacteria and to discover active component combination (ACC) contributing to the anti-inflammatory activity of XCQD. The water extract of XCQD was anaerobically incubated with human intestinal bacteria suspensions for 48 h at 37 °C. A liquid chromatography-hybrid quadrupole time-of-flight mass spectrometry (LC-Q-TOF/MS) method was performed for identification of the metabolites. In addition, the anti-inflammatory effects of XCQD and biotransformed XCQD (XCQD-BT) were evaluated in vitro with cytokines in RAW264.7 cells induced by lipopolysaccharide (LPS). A total of 51 compounds were identified in XCQD and XCQD-BT. Among them, 20 metabolites were proven to be transformed by human intestinal bacteria. Significantly, a combination of 14 compounds was identified as ACC from XCQD-BT, which was as effective as XCQD in cell models of inflammation. In conclusion, this study provided an applicable method, based on intestinal bacterial metabolism, for identifying combinatory compounds responsible for a certain pharmacological activity of herbal medicines.
Subject(s)
Animals , Humans , Mice , Anti-Inflammatory Agents , Pharmacology , Therapeutic Uses , Bacteria , Metabolism , Biotransformation , Cytokines , Metabolism , Drugs, Chinese Herbal , Chemistry , Metabolism , Feces , Microbiology , Gastrointestinal Microbiome , Inflammation , Drug Therapy , Lipopolysaccharides , Pharmacology , Macrophages , Metabolism , Models, Biological , Molecular StructureABSTRACT
Poliumoside is representative of phenylethanoid glycosides, which are widely found in many plants. Poliumoside is also regarded as the main active component of Callicarpa kwangtungensis Chun (CK), though its oral bioavailability in rat is extremely low (0.69%) and its in vivo and in vitro metabolism has not yet been systematically investigated. In the present study, an ultra performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UPLC/Q-TOF-MS) method was employed to identify the metabolites and investigate the metabolic pathways of poliumoside in rat after oral administration 1.5 g·kg of poliumoside. As a result, a total of 34 metabolites (30 from urine, 17 from plasma, and 4 from bile) and 9 possible metabolic pathways (rearrangment, reduction, hydration, hydrolyzation, dehydration, methylation, hydroxylation, acetylation, and sulfation) were proposed in vivo. The main metabolite, acteoside, was quantified after incubated with rat intestinal bacteria in vitro. In conclusion, the present study systematically explored the metabolites of poliumoside in vivo and in vitro, proposing metabolic pathways that may be significant for further metabolic studies of poliumoside.
Subject(s)
Animals , Male , Rats , Administration, Oral , Bacteria , Metabolism , Bile , Chemistry , Caffeic Acids , Blood , Chemistry , Urine , Callicarpa , Chemistry , Chromatography, High Pressure Liquid , Drugs, Chinese Herbal , Chemistry , Metabolism , Glycosides , Blood , Chemistry , Urine , Intestines , Microbiology , Mass Spectrometry , Methods , Molecular Structure , Plasma , Chemistry , Rats, Sprague-Dawley , Urine , ChemistryABSTRACT
Objective To investigate the metabolic routes and metabolites of Rehmannia glutinosa and Cornus officinalis herb pair produced by gut microbiome from rats. Methods A rapid and sensitive ultra-performance liquid chromatography/quadrupole-time-of-flight mass spectrometry (UPLC-Q-TOF/MS) technique combined with Metabolynx™ software was established and successfully applied to identify the metabolites of the main bioactive components in the herb pair extract by rat intestinal bacteria. Results Four parent compounds (loganin, morroniside, catalpol, and acteoside) and their eight corresponding metabolites were detected and tentatively identified by the characteristics of their protonated ions. Hydrogenated and demethylated loganetin, dehydroxylated morronisid aglycone, caffeic acid, and its methylated product were the main metabolites. These metabolites suggested that the glycosides were firstly hydrolyzed to their aglycones by hydrolytic enzymes of the enteric microbial flora and subsequently to the other metabolites through hydrogenation, (de)-methylation, and de-hydroxylation. Conclusion The results may be helpful for the further investigation of the pharmacokinetic study of R. glutinosa and C. officinalis herb pair in vivo.
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To investigate the metabolism of major components in Inula cappa by rat intestinal bacteria in vitro. I. cappa extract was incubated for 24 h with rat intestinal bacteria under anaerobic environment. After the samples were precipitated by n-butanol, UPLC-Q-TOF-MS/MS was applied for the qualitative analysis of the metabolites, combined with data software such as Metabolite Tools, Data Analysis and so on. The potential metabolites in rat intestinal bacteria were analyzed by comparing the total ion current of the test samples and blank samples and analyzing the quasi-molecular ion and fragment ion of all chromatograms. The results injected that fourteen metabolites were detected in rat intestinal flora. Various types of metabolic reactions happen to caffeoylquinic acid in intestinal flora, including isomerization, hydrolyzation, there were also methylation, hydrogenation and acetylation of caffeic acid. At the same time, a methylate of dicaffeoylquinic acid was also detected. Presumably, caffeoylquinic acids were gradually transformed into more hydrophobic metabolites with smaller molecular mass, which were better absorbed by the intestinal tract.
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Ulcerative colitis(UC)is a common chronic intestinal inflammation and one of the modern diseases that are difficult to cure effectively.Increasing attention is paid on UC based on metabonomic and microbe analysis. In this article, we review the recent advances in endogenous metabolites including amino acid, energy metabolism and lipid metabolism, intestinal bacteria including Firmicutes, Bacte-roidetes, Proteobacteria and Actinobacteria as well as covariation between metabolites and intestinal bacteria in UC.Short chain fatty acid and tryptophan are used as examples to ecaborate on the important functions of metabolism of nutrients and intestinal bacteria in diseases and illustrate the contributions of intestinal bacteria to diseases.