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    Home » Comparative evaluation of two herbal formulas for gastrointestinal function and gut microbiota modulation in rats with loperamide-induced dyspepsia
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    Comparative evaluation of two herbal formulas for gastrointestinal function and gut microbiota modulation in rats with loperamide-induced dyspepsia

    morshediBy morshediAugust 25, 2025No Comments9 Mins Read
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    Comparative evaluation of two herbal formulas for gastrointestinal function and gut microbiota modulation in rats with loperamide-induced dyspepsia
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    Parts of natural formulation and preparation of the aqueous extract

    All natural supplies used on this research have been bought from Omniherb (Daegu, South Korea) and saved in a pharmacy at Dongguk College Worldwide Hospital (Ilsan, Goyang-si, Republic of Korea) earlier than experiment. The plant supplies used on this research have been recognized and authenticated by Prof. Solar-dong Park on the Division of Prescription, Faculty of Korean Medication, Dongguk College, primarily based on morphological traits. Voucher specimens (No. DGUKM-2024-002) of every plant have been deposited on the herbarium of Faculty of Korean Medication which is out there publicly upon request.

    No wild assortment was carried out, and thus no particular assortment permits have been required. SST comprised seven herbs—specifically, 4.8 g of Bupleurum chinense DC. (Apiaceae) root, 4.8 g of dried peel from Citri reticulatae (Rutaceae), 4 g of Paeonia lactiflora Pall. (Ranunculaceae) root, 4 g of inexperienced fruit from Citrus aurantium L. (Rutaceae), 4 g of Cyperus rotundus L. (Cyperaceae) rhizome, 4 g of Ligusticum chuanxiong Hort. (Apiaceae) rhizome, and three g of Glycyrrhiza uralensis Fisch. (Fabaceae) rhizome. YJT (YJT) containd 4 herbs—specifically, 9 g of Zingiber officinale Rose (Zingiberaceae) rhizome, 9 g of Atractylodes macrocephala Koidz (Asteraceae) rhizome, 9 g of Codonopsis pilosula Nannf. (Campanulaceae) root, and 9 g of Glycyrrhiza uralensis Fisch. Ex DC. (Fabaceae) rhizome.

    The herbs in every formulation have been floor to a rough powder utilizing an electrical grinder. The resultant powder was extracted with 30% ethanol (v/v) and boiled for two h. The combination was cooled, filtered, and centrifuged to acquire the supernatant. The supernatant was concentrated utilizing a rotary evaporator (EYELA N-1200A, EYELA, Tokyo, Japan) at 50 °C underneath decreased strain. Any remaining aqueous residue was freeze-dried at − 80 °C utilizing a lyophilizer (Bondiro, IlshinBioBase, Dongducheon, Republic of Korea), and saved at − 80 °C till additional use. The extraction yields of SST and YJT have been 24.8% and 35.1%, respectively. The optimum doses of the extract have been calculated in response to the scientific dose from the Korean Pharmacopeia and human-to-rat equal dose ratio21,50. Accordingly, the equal single doses for rats have been set at 2 g/(kgday) for YJT and 1.4 g/kg/day for SST. The HPLC fingerprint evaluation of the extracts from the 2 natural formulation is introduced in Supplementary Determine S1. The HPLC circumstances are detailed in Tables S4 and S5.

    Animals

    Thirty-eight male Sprague–Dawley rats (seven weeks outdated; physique weight, 230 ± 20 g) have been bought from Daehan Bio-Hyperlink (Eumseong-gun, Chungbuk, Korea) and housed underneath particular pathogen-free (SPF) circumstances. The rats have been offered normal rat pellet chow (Cargill Ajri Purina, Seongnam-si, Gyeonggi-do, Korea) and water advert libitum. They have been housed underneath typical laboratory circumstances with a 12-h mild/12-h darkish cycle, an ambient temperature of twenty-two ± 3 °C, and humidity of 60 ± 5%. Earlier than the experiment, the rats have been a 14-day acclimation interval. This research is reported by the ARRIVE pointers (https://arriveguidelines.org) for the reporting of animal experiments. All animal procedures have been permitted by the Institutional Animal Care and Use Committee (IACUC) of Dongguk College (Approval No. IACUC-202206232, permitted on July 8, 2022) and carried out in strict compliance with institutional and worldwide pointers to make sure moral and humane remedy of animals. Anesthesia was administered utilizing a mixture of Zoletil® (40 mg/kg; tiletamine-zolazepam, Virbac, Carros, France) and Rompun® (10 mg/kg; xylazine hydrochloride, Bayer, Leverkusen, Germany). All efforts have been made to reduce animal struggling and misery all through the research.

    Experimental design

    The rats have been randomly divided into 5 teams with seven to eight animals per group. Animals within the regular group have been administered 0.9% NaCl all through the experiment. The opposite teams comprised rats that have been intraperitoneally injected with LOP (3 mg/kg/day) suspended in 0.9% sodium chloride as soon as a day to induce dyspepsia9,51. The LOP group obtained LOP for less than 7 days together with 0.9% sodium chloride, whereas the MOS group obtained each LOP and mosapride citrate (p.o., 3 mg/kg/day) as a reference drug52. The YJT group obtained LOP and a pair of g/kg/day YJT through oral gavage. The SST group obtained LOP and 1.4 g/kg/day SST through oral gavage (Fig. 1a).

    Measurement of gastric phenotype

    Physique mass and meals consumption of the rats have been monitored weekly. Lastly, two units of contemporary fecal samples have been collected for additional evaluation. One set was snap-frozen at − 80ºC for DNA extraction and subsequent 16S rRNA sequencing. One other set of fecal samples was weighed to find out the load of contemporary stool samples. The samples have been then dried at 60 °C for 48 h to acquire the dry weight of the fecal pellets. The burden of the collected fecal pellets was measured each when moist and after drying to find out their water content material of the fecal pellets. The distinction between the 2 weights was53.

    Earlier than the charcoal take a look at, the rats have been fasted for 20 h to evaluate the intestinal transit capability on the finish of the 7th day of remedy. A suspension of two mL of charcoal meal in 1% (w/v) carboxymethylcellulose was administered through oral gavage54. After 40 min, all of the rats have been anesthetized with a mixture of Zoletil and Rompun. Subsequently, blood was collected from the center and the small gut was rigorously laid out on paper. A vertical {photograph} was obtained to measure the space from the pyloric sphincter to the rectum (Fig. 2a). The gap traveled by the charcoal from the pyloric sphincter to the furthest edge was measured. The GI transit ratio was calculated as the share of distance traveled by the activated charcoal relative to the complete size of the small gut55. Ultimately, all intestinal tissues have been washed with PBS and subsequently both mounted in 4% paraformaldehyde answer or saved at − 80 °C in RNAlater answer (Ambion, TX, USA) for additional analyses.

    Serum ghrelin willpower

    After 1 h of blood clotting, the serum was remoted by centrifugation at 3000×g for 15 min and saved at− 80 °C for future use. Enzyme-linked immunosorbent assay (ELISA) kits have been used to find out ghrelin ranges within the serum in response to the producer’s directions (Catalog No. CSB-E09816r, Cusabio). The absorbance was measured at 450 nm utilizing a spectrophotometer (TECAN Spark, Greenmate Biotech Co., Switzerland). The intra- and interassay coefficients of variation (CVs) have been < 8% and < 10%, respectively.

    Evaluation of genes expression within the small intestines

    TRIzol (Invitrogen Life Applied sciences, Carlsbad, CA, USA) answer was used to extract RNA from small intestinal tissues in accordance with the producer’s directions. After high quality and amount checks, whole RNA was preserved at − 80 °C for subsequent evaluation through real-time quantitative polymerase chain response (RT-qPCR). Equal quantities of every RNA pattern have been reverse transcribed utilizing an oligodeoxythymine 18-mer primer (Thermo Scientific, Waltham, MA, USA) and the cDNA RT PreMix equipment (Catalog No. Okay-2041-B, Bioneer, Daejeon, South Korea). Primers (detailed data offered in Desk S1) have been synthesized by Macrogen Inc. (Seoul, South Korea). Quantitative evaluation of the mRNA expression for a selected gene associated to the immune system, gastric motility, and water absorbance was completed utilizing RT-qPCR with a Mild Cycler 480™ instrument (Roche, Roche Utilized Science, Mannheim, Germany) and SYBR Inexperienced Actual-time PCR Grasp Combine (Toyobo, Osaka, Japan). Devoted LightCycler software program (Roche Utilized Science, model 1.2) was used for knowledge processing and evaluation. Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) was used to normalize the cycle threshold (Ct) values, and the relative gene expression was calculated utilizing the usual 2−△△Ct technique.

    Histopathological evaluation

    Recent ileum and duodenum tissues have been mounted in 4% paraformaldehyde answer for histomorphological analysis. Paraffin-embedded samples have been minimize into 4 μm sections utilizing a microtome (Leica RM2235, Leica Microsystems, Nussloch, Germany) and stained with H&E. Photos have been obtained utilizing a lightweight microscope (BX61; Olympus, Tokyo, Japan) at 200×magnification. Histological parameters, corresponding to villus peak and crypt depth, have been measured utilizing ImageJ software program (Bethesda, MD, USA), as beforehand described56.

    Fecal DNA extraction and 16S rRNA gene sequencing

    DNA was extracted from the fecal pellets utilizing the QIAamp® Quick DNA Stool Equipment (Catalog No. 51604, Qiagen, Hilden, Germany) following the producer’s directions. The purity and focus of the extracted DNA have been evaluated with a Nanodrop ND-2000 UV spectrophotometer, and solely high-quality DNA with an A260/A280 ratio starting from 1.8 to 2.0 was utilized for PCR amplification. Common primers (8F and 338R) with barcode sequences (Desk S2) for multiplexing the reads of every pattern have been used to amplify the V1-V2 area of the 16S rRNA genes by PCR. The response combination contained 2 μL of template DNA, 1 μL of every primer (10 μM), and 16 μL of two×Taq PCR MasterMix in a complete quantity of 20 μL. Sequencing reactions have been carried out utilizing an Ion Torrent PGM system (Thermo Scientific, Wilmington, DE, USA) in response to the producer’s pointers. The ensuing uncooked sequence reads have been subjected to high quality filtering, and the high-quality reads have been additional analyzed for variety and taxonomic task utilizing the quantitative insights into the microbial ecology (QIIME) 2 pipeline57. Distinctive sequences with > 97% similarity have been clustered into operational taxonomic items (OTUs) for downstream evaluation. All of the uncooked sequencing knowledge described on this research can be found from the DNA Information Financial institution of Japan (accession quantity PRJDB19566).

    Statistical evaluation

    The outcomes are introduced as imply ± normal error of the imply (SEM). Information have been analyzed utilizing a two-way evaluation of variance (ANOVA) with SPSS (model 17.0; SPSS Inc., Chicago, IL, USA), and important variations have been decided with a p worth < 0.05. Moreover, least important distinction (LSD) assessments have been carried out when vital, as specified within the determine legends. The energy of the connection between the parameters was assessed utilizing a two-tailed Pearson’s correlation take a look at primarily based on knowledge from all teams. An absolute worth of the Pearson correlation coefficient (r) higher than 0.3 was thought of indicative of a major correlation. Graphs have been generated utilizing the GraphPad Prism 7.04 (GraphPad, San Diego, CA, USA). Bacterial group richness and variety have been assessed utilizing Chao 1 values, and the Shannon index. The Bray–Curtis dissimilarity statistic was used for estimating β-diversity by means of principal coordinate evaluation (PCoA). Bacterial taxonomy was recognized utilizing sequence tag-based evaluation of the microbial inhabitants dynamics technique, and important variations in abundance have been examined utilizing the ANOVA and put up hoc LSD assessments.



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