1.Randomized Controlled Trail of Ganlu Qingwen Prescription for Treatment of Community-acquired Pneumonia
Xiangpeng LI ; Fengsen LI ; Ling WANG ; Zheng LI ; Dan XU ; Jiangtao LI
Chinese Journal of Experimental Traditional Medical Formulae 2025;31(11):225-236
ObjectiveTo explore the regulatory effect of Ganluqingwen prescription on inflammation and immunity by observing the clinical efficacy of Ganluqingwen prescription in the treatment of community-acquired pneumonia (CAP), so as to provide a clinical basis for the treatment of CAP by traditional Chinese medicine (TCM). MethodsA randomized controlled trial was conducted by selecting patients who were diagnosed with CAP and identified as wind-heat attacking lungs in Xinjiang Uygur Autonomous Region Hospital of TCM from January 2024 to May 2024 and assigning the patients to a control group (treated by western medicine treatment) or an experimental group (treated by Ganluqingwen prescription combined with western medicine). The data of the enrolled patients before treatment, for three-day treatment, for seven-day treatment, and for 14-day treatment were collected, including basic information, medical history, pneumonia severity index (PSI) classification, and distribution and difference of laboratory and imaging information indexes. The peripheral blood specimens were collected from the patients. and the changes of inflammatory factors in peripheral blood were detected by using enzyme-linked immunosorbent assay (ELISA) reagent kits and flow-type multifactor microarrays to evaluate the clinical safety and efficacy of Ganluqingwen prescription in CAP. ResultsCompared with those in the groups before treatment, the total scores of TCM syndromes significantly decreased in both groups (P<0.05). Compared with those in the control group after treatment, the total scores of TCM syndromes decreased more significantly in the experimental group (P<0.05). Compared with the control group after treatment, the experimental group displayed a significantly reduced number of days of fever in patients (P<0.05). Compared with those in the groups before treatment, the leukocyte, neutrophil counts, C-reactive protein (CRP), procalcitonin (PCT), interleukin (IL)-6, alanine aminotransferase (ALT), aspartate aminotransferase (AST), creatinine (Cr), creatine kinase (CK), and creatine kinase isoenzymes (CK-MB) in both groups decreased (P<0.05) after treatment. Compared with that in the control group after treatment, the decrease of leukocyte, neutrophil counts, CRP, PCT, IL-6, ALT, AST, Cr, CK, and CK-MB was more pronounced in the experimental group (P<0.05). Compared with those in the group before treatment, the partial pressure of carbon dioxide increased in the experimental group for 3 d of treatment (P<0.05), and the standard alkali residual, actual alkali residual, standard bicarbonate concentration, and actual bicarbonate concentration increased in the experimental group for 7 d of treatment (P<0.05). Compared with that in the group before treatment, D-dimer decreased in the control group for 7 d of treatment (P<0.05). D-dimer and activated partial thromboplastin time (APTT) decreased in the experimental group for 3 d of treatment (P<0.05), and D-dimer, fibrinogen (FIB), and APTI significantly decreased in the group for 7 d of treatment (P<0.05). Compared with the group for 3 d of treatment, the experimental group for 7 d of treatment showed decreased FIB (P<0.05). Compared with those in the groups before treatment, the levels of inflammatory factors IL-4, IL-10, and IL-13 were elevated in the peripheral blood of the two groups after treatment, and the levels of B lymphocyte chemoattractant (BLC), interferon gamma-induced protein 10 (IP-10), tumor necrosis factor-alpha (TNF-α), interferon-gamma (IFN-γ), monocyte chemoattractant protein-1 (MCP-1), CRP, IL-2, IL-6, IL-8, IL-17, IL-22, and IL-23p19 were significantly reduced (P<0.01). Compared with the control group after treatment, the experimental group exhibited more significant improvement in indexes above (P<0.01). ConclusionThe group treated by Ganluqingwen prescription combined with western medicine shows more significant effects on reducing total scores of TCM syndromes, lowering the ability of leukocyte and neutrophil counts, decreasing BLC, IP-10, TNF-α, IFN-γ, MCP-1, CRP, IL-2, IL-6, IL-8, IL-17, IL-22, and IL-23p19 in the peripheral blood of the patients, and elevating levels of IL-4, IL-10, and IL-13 than the group treated by western drugs alone.
2.Randomized Controlled Trail of Ganlu Qingwen Prescription for Treatment of Community-acquired Pneumonia
Xiangpeng LI ; Fengsen LI ; Ling WANG ; Zheng LI ; Dan XU ; Jiangtao LI
Chinese Journal of Experimental Traditional Medical Formulae 2025;31(11):225-236
ObjectiveTo explore the regulatory effect of Ganluqingwen prescription on inflammation and immunity by observing the clinical efficacy of Ganluqingwen prescription in the treatment of community-acquired pneumonia (CAP), so as to provide a clinical basis for the treatment of CAP by traditional Chinese medicine (TCM). MethodsA randomized controlled trial was conducted by selecting patients who were diagnosed with CAP and identified as wind-heat attacking lungs in Xinjiang Uygur Autonomous Region Hospital of TCM from January 2024 to May 2024 and assigning the patients to a control group (treated by western medicine treatment) or an experimental group (treated by Ganluqingwen prescription combined with western medicine). The data of the enrolled patients before treatment, for three-day treatment, for seven-day treatment, and for 14-day treatment were collected, including basic information, medical history, pneumonia severity index (PSI) classification, and distribution and difference of laboratory and imaging information indexes. The peripheral blood specimens were collected from the patients. and the changes of inflammatory factors in peripheral blood were detected by using enzyme-linked immunosorbent assay (ELISA) reagent kits and flow-type multifactor microarrays to evaluate the clinical safety and efficacy of Ganluqingwen prescription in CAP. ResultsCompared with those in the groups before treatment, the total scores of TCM syndromes significantly decreased in both groups (P<0.05). Compared with those in the control group after treatment, the total scores of TCM syndromes decreased more significantly in the experimental group (P<0.05). Compared with the control group after treatment, the experimental group displayed a significantly reduced number of days of fever in patients (P<0.05). Compared with those in the groups before treatment, the leukocyte, neutrophil counts, C-reactive protein (CRP), procalcitonin (PCT), interleukin (IL)-6, alanine aminotransferase (ALT), aspartate aminotransferase (AST), creatinine (Cr), creatine kinase (CK), and creatine kinase isoenzymes (CK-MB) in both groups decreased (P<0.05) after treatment. Compared with that in the control group after treatment, the decrease of leukocyte, neutrophil counts, CRP, PCT, IL-6, ALT, AST, Cr, CK, and CK-MB was more pronounced in the experimental group (P<0.05). Compared with those in the group before treatment, the partial pressure of carbon dioxide increased in the experimental group for 3 d of treatment (P<0.05), and the standard alkali residual, actual alkali residual, standard bicarbonate concentration, and actual bicarbonate concentration increased in the experimental group for 7 d of treatment (P<0.05). Compared with that in the group before treatment, D-dimer decreased in the control group for 7 d of treatment (P<0.05). D-dimer and activated partial thromboplastin time (APTT) decreased in the experimental group for 3 d of treatment (P<0.05), and D-dimer, fibrinogen (FIB), and APTI significantly decreased in the group for 7 d of treatment (P<0.05). Compared with the group for 3 d of treatment, the experimental group for 7 d of treatment showed decreased FIB (P<0.05). Compared with those in the groups before treatment, the levels of inflammatory factors IL-4, IL-10, and IL-13 were elevated in the peripheral blood of the two groups after treatment, and the levels of B lymphocyte chemoattractant (BLC), interferon gamma-induced protein 10 (IP-10), tumor necrosis factor-alpha (TNF-α), interferon-gamma (IFN-γ), monocyte chemoattractant protein-1 (MCP-1), CRP, IL-2, IL-6, IL-8, IL-17, IL-22, and IL-23p19 were significantly reduced (P<0.01). Compared with the control group after treatment, the experimental group exhibited more significant improvement in indexes above (P<0.01). ConclusionThe group treated by Ganluqingwen prescription combined with western medicine shows more significant effects on reducing total scores of TCM syndromes, lowering the ability of leukocyte and neutrophil counts, decreasing BLC, IP-10, TNF-α, IFN-γ, MCP-1, CRP, IL-2, IL-6, IL-8, IL-17, IL-22, and IL-23p19 in the peripheral blood of the patients, and elevating levels of IL-4, IL-10, and IL-13 than the group treated by western drugs alone.
3.Exploring Effect of Buchong Tiaojing Prescription on Ferroptosis in Ovarian Tissue of Rat Model of Diminished Ovarian Reserve and Its Mechanism from Perspective of NLRP3 Inflammasome
Yixuan WANG ; Zuang LI ; Yunling ZHENG ; Yucheng LI ; Songping LUO ; Ling ZHU
Chinese Journal of Experimental Traditional Medical Formulae 2025;31(3):40-48
ObjectiveTo explore the therapeutic mechanism of Buchong Tiaojing prescription for rats with diminished ovarian reserve (DOR) from the perspectives of nucleotide-binding oligomerization domain (NOD)-like receptor protein 3 (NLRP3) inflammasome and ferroptosis. MethodsA total of 48 female SD rats were randomly divided into a normal group, a model group, low, medium, and high dose groups of Buchong Tiaojing prescription, and an MCC950 group, with eight rats in each group. Except the normal group, all the other groups were injected subcutaneously on the back of the neck with D-galactose to prepare the DOR rat model. From the 15th day of modeling, the rats in the low, medium, and high dose groups of Buchong Tiaojing prescription were subjected to gavage daily at doses of 14.4, 28.8, 57.6 g·kg-1, respectively. Rats in the MCC950 group were injected intraperitoneally with MCC950 at a dose of 10 mg·kg-1, once every other day. The interventions of all the groups lasted for 4 weeks. The estrous cycle of the rats was observed with vaginal exfoliated cell smear. Hematoxylin-eosin (HE) staining was performed to observe the development of follicles and corpus luteum in the ovary. Enzyme-linked immunosorbent assay (ELISA) was performed to detect the levels of serum sex hormones and interleukin-1β (IL-1β). Real-time fluorescence quantitative polymerase chain reaction (Real-time PCR) and Western blot assay were performed to detect the mRNA and protein expression of NLRP3 inflammasome, acyl-CoA synthetase long-chain family member 4 (ACSL4), transferrin receptor 1 (TFR1), and glutathione peroxidase 4 (GPX4), and oxidative stress kits were used to detect ovarian superoxide dismutase (SOD) and malondialdehyde (MDA) levels. ResultsDuring the experiment, one rat died in the high dose group of Buchong Tiaojing prescription, and a total of 47 rats were finally included in the index tests and statistics. Compared with those in the normal group, rats in the model group had significantly disturbed estrous cycles, increased number of atretic follicles, and significant disorder of serum sex hormones. The mRNA and protein expression of NLRP3 inflammasome, ACSL4, and TFR1 in ovarian tissue was up-regulated (P<0.01), while that of GPX4 was significantly down-regulated (P<0.01). The SOD content in the ovary was decreased significantly, while the MDA level was increased (P<0.01). After drug intervention, the estrous cycle of rats was basically resumed, and the follicles at all levels were more structurally intact and significantly increased in number. Additionally, the levels of serum sex hormones and IL-1β were significantly improved. The mRNA and protein expression of NLRP3 inflammasome, ACSL4, and TFR1 were down-regulated, while that of GPX4 was significantly up-regulated, and the ovarian oxidative stress was alleviated (P<0.05, P<0.01), especially in the high dose group of Buchong Tiaojing prescription and the MCC950 group. ConclusionInflammatory injury and ferroptosis occur in the ovaries of DOR rats, and the Buchong Tiaojing prescription is able to inhibit ovarian NLRP3 inflammasome, alleviate the degree of ovarian ferroptosis, and improve ovarian reserve.
4.Mechanism of Aerobic Exercise in Delaying Brain Aging in Aging Mice by Regulating Tryptophan Metabolism
De-Man ZHANG ; Chang-Ling WEI ; Yuan-Ting ZHANG ; Yu JIN ; Xiao-Han HUANG ; Min-Yan ZHENG ; Xue LI
Progress in Biochemistry and Biophysics 2025;52(6):1362-1372
ObjectiveTo explore the molecular mechanism of aerobic exercise to improve hippocampal neuronal degeneration by regulating tryptophan metabolic pathway. Methods60 SPF-grade C57BL/6J male mice were divided into a young group (2 months old, n=30) and a senile group (12 months old, n=30), and each group was further divided into a control group (C/A group, n=15) and an exercise group (CE/AE group, n=15). An aerobic exercise program was used for 8 weeks. Learning memory ability was assessed by Y-maze, and anxiety-depression-like behavior was detected by absent field experiment. Hippocampal Trp levels were measured by GC-MS. Nissl staining was used to observe the number and morphology of hippocampal neurons, and electron microscopy was used to detect synaptic ultrastructure. ELISA was used to detect the levels of hippocampal Trp,5-HT, Kyn, KATs, KYNA, KMO, and QUIN; Western blot was used to analyze the activities of TPH2, IDO1, and TDO enzymes. ResultsGroup A mice showed significant decrease in learning and memory ability (P<0.05) and increase in anxiety and depressive behaviors (P<0.05); all of AE group showed significant improvement (P<0.05). Hippocampal Trp levels decreased in group A (P<0.05) and increased in AE group (P<0.05). Nidus vesicles were reduced and synaptic structures were degraded in group A (P<0.05), and both were significantly improved in group AE (P<0.05). The levels of Trp, 5-HT, KATs, and KYNA were decreased (P<0.05) and the levels of Kyn, KMO, and QUIN were increased (P<0.05) in group A. The activity of TPH2 was decreased (P<0.05), and the activities of IDO1 and TDO were increased (P<0.05). The AE group showed the opposite trend. ConclusionThe aging process significantly reduces the learning memory ability and increases the anxiety-depression-like behavior of mice, and leads to the reduction of the number of nidus vesicles and degenerative changes of synaptic structure in the hippocampus, whereas aerobic exercise not only effectively enhances the spatial learning memory ability and alleviates the anxiety-depression-like behavior of aging mice, but also improves the morphology and structure of neurons in hippocampal area, which may be achieved by the mechanism of regulating the tryptophan metabolic pathway.
5.Changes in the levels of miR-34a and miR-29b in lens epithelial cells of patients with age-related cataract and their clinical significance
Ling ZHENG ; Haibo JIANG ; Mengru LI ; Bo ZHOU
International Eye Science 2025;25(10):1704-1707
AIM: To investigate the changes of microRNA-34a(miR-34a)and microRNA-29b(miR-29b)levels in lens epithelial cells of age-related cataracts(ARC)patients and their clinical significance.METHODS: A total of 65 ARC patients(study group)and 53 cases of clear lens anterior capsulorhexis(control group)who visited our hospital from February 2023 to February 2024 were gathered. Pearson was applied to test the correlation between miR-34a and miR-29b. Multifactor Logistic regression was applied to determine the factors affecting the occurrence of ARC.RESULTS: Compared with the control group, the expression levels of miR-34a and miR-29b in lens epithelial cells of the research group showed a significant decrease trend(all P<0.05). There was a positive correlation between miR-34a and miR-29b in the lens epithelial cells of ARC patients(r=0.472, P<0.05). MiR-34a and miR-29b were influence factors for ARC(all P<0.05).CONCLUSION: The levels of miR-34a and miR-29b in lens epithelial cells of ARC patients are significantly reduced, which is associated with the occurrence of ARC.
6.The Relationship of Transcription Factor BRF1 Expression to Tumor and Cardiomyopathy
Li-Ling ZHENG ; Yong-Luan LIN ; Mei-Ling CHEN ; Zheng-Yan ZHONG ; Shuping ZHONG
Progress in Biochemistry and Biophysics 2025;52(9):2241-2251
TFIIB-related factor 1 (BRF1) is an important transcription factor. It specifically regulates the transcription of RNA polymerase III-dependent genes (RNA Pol III genes). The products of these genes are some small non-coding RNAs, including transfer RNAs (tRNAs) and 5S ribosomal RNAs (5S rRNA). The transcription levels of tRNAs and 5S rRNA vary with changes in intracellular BRF1 amounts. tRNAs and 5S rRNA play a crucial role in determining protein synthesis. Studies have demonstrated that dysregulation of tRNAs and 5S rRNA is closely related to cell growth, proliferation, transformation, and even tumorigenesis. BRF1 is a key factor determining the generation of tRNAs and 5S rRNA. Increasing BRF1 expression enhances cell proliferation and transformation, promoting tumor development. In contrast, repressing BRF1 activity decreases the rates of cell proliferation and transformation, and inhibits tumor growth. High levels of BRF1 are found in the samples of patients suffering from hepatocellular carcinoma, breast cancer, gastric carcinoma, lung cancer, prostate carcinoma, and other cancers. It indicates that high levels of BRF1 are closely related to the occurrence of human cancer and may be a common landmark of tumors. But there is discrepancy in the regulatory mechanisms and signaling pathways of BRF1 overexpression in different cancers. In general, high levels of BRF1 in patients suffering from cancer show short survival period and poor prognosis. However, there is one exception, namely breast cancer. Approximate 80% of cases of breast cancer are estrogen receptor-positive (ER+) and 20% are ER-. The cases with high levels of BRF1 reveal longer survival period and better prognosis after they accepted the hormone treatment by Tamoxifen (Tam), compared to the cases with low level BRF1. It seems like a contradiction. Most of the cases with high levels of BRF1 belong to ER+ status. Tam has been used to treat ER+ cases of breast cancer after diagnosis and surgery. Thus, hormone therapy, such as Tam, is more effective on these patients. This is because, on one hand, that Tam competes with E2 (17β-estradiol) to bind to estrogen receptor α (ERα), but does not dissociate to occupy the receptors, blocking E2 binding to this receptor and inhibiting its biological effects. On other hand, Tam can inhibit the expression of BRF1, leading to a decline of intracellular BRF1 levels. Therefore, the actual levels of BRF1 are lower in the patients with ER+ breast cancer. It appears the prognosis of the high BRF1 expression cases better than that of the low BRF1 expression cases. Myocardial hypertrophy manifests magnification of cardiomyocyte volume rather than number increasing in the postnatal heart. Myocardial hypertrophy is a critical risk factor underlying cardiovascular diseases. No matter how myocardial hypertrophy occur, it will ultimately lead to myocardial dysfunction and heart failure. Hypertrophic growth of cardiomyocytes requires a large amount of protein synthesis to meet its needs of cardiomyocyte growth. Animal models and cell experiments have shown that myocardial hypertrophy stimulates a significant increase in BRF1 expression and transcription of tRNAs and 5S rRNA. Interestingly, elevated levels of BRF1 are found in the myocardium tissues of patients with myocardial hypertrophy. These studies demonstrate that BRF1 indeed plays a critical role in myocardial hypertrophy. In summary, high levels of BRF1 are found in patients suffering from different cancers and myocardial hypertrophy. It implies that BRF1 is a promising biological target of cancer and cardiomyopathy. BRF1 is expected to become a common biomarker for early diagnosis and prognostic observation of different human cancers. It is also an important biomarker for the diagnosis and treatment of cardiomyopathy. BRF1 not only holds an important position in the field of basic medical research but also has great prospects for translational medicine. In the present article, we summarize the progress on studies of BRF1 expressions in cancer and cardiomyopathy, proposes future research directions. It is a new research area. Here, we emphasize the significancy of BRF overexpression in the two huge diseases of human, cancer and cardiomyopathy to raise people's attention to this field.
7.Best evidence summary for difficult peripheral intravenous catheterization in children
Ruming YE ; Xianghui HUANG ; Jianshan ZHENG ; Wenchao WANG ; Guanhong WU ; Ling LIU ; Yi ZHANG ; Danting LI ; Xiuyu YE
Chinese Journal of Modern Nursing 2024;30(6):790-795
Objective:To search, evaluate, and summarize the best evidence for difficult peripheral intravenous catheterization in children.Methods:Following the "6S" evidence pyramid model, literature related to the management of difficult peripheral veins in children was searched in both English and Chinese databases including UpToDate, BMJ Best Practice, National Guidelines Clearinghouse, the Joanna Briggs Institute Evidence-Based Health Care Database, PubMed, Medlive, SinoMed, CNKI, and Wanfang Database. The search period was from the establishment of the database to January 2023. Two researchers trained in systematic evidence-based nursing, independently evaluated the quality of included literature and extracted relevant evidence.Results:Five articles were included: two guidelines, two expert consensuses, and one systematic review. 19 best evidence were summarized, covering five aspects: difficult vein quality management, difficult vein assessment, difficult intravenous catheterization site and needle type selection, difficult intravenous catheterization auxiliary methods, and handling of failed difficult intravenous catheterization.Conclusions:This study summarizes the best evidence for difficult peripheral intravenous catheterization in children, demonstrating clinical nursing practicality. It provides evidence-based guidance for pediatric nursing staff performing difficult intravenous catheterization.
8.Isolation,preservation,and biological characteristics analysis of a Listeria bacteriophage
Ling-Yun LIU ; Pan MAO ; Jin-Ni CHEN ; Ling-Ling LI ; Yan WANG ; Jing-Dong SONG ; Zheng-Hong CHEN ; Chang-Yun YE
Chinese Journal of Zoonoses 2024;40(5):435-441
The aim of our research was to obtain Listeria bacteriophages from food and related environments,and conduc-ted the analysis of the electron microscopic morphology,host range specificity,and biological characteristics of the purified phages.The double-layer agar method and the spot test were employed for the isolation and identification of a virulent Listeria phage named LMLPA5,with the isolated strain Listeria in-nocua Lin08 as the host.Phage morphology was observed by transmission electron microscope.The biological characteris-tics of the phage were assessed by determining their host range,optimal multiplicity of infection(MOI),one-step growth curve,and physicochemical stability.Additionally,the preservation efficacy of the phage at 4 ℃,-20 ℃,and-80 ℃ was explored.The phage LMLPA5 belongs to the family Myoviridae based on morphology,exhibiting clear and transparent plaques without halo surrounded.Strains of sever-al Listeria species and different serotypes strains of Listeria monocytogenes were susceptible to lysis by LMLPA5,indica-ting its broad-spectrum activity against Listeria monocytogenes.Optimal MOIs and single-step growth curve analyses revealed optimal MOIs of 0.1 and latent period of 10 minutes for LMLPA5,with average burst size at 95.2 PFU/cell.LMLPA5 was sensitive to high temperatures,and completely inactivated after exposure to 70 ℃ for 1 h,while the phage remained stable for over 32 hours ranging from 4 ℃ to 40 ℃.Within the pH range of 4 to 10,phage titer remained stable and completely inactiva-ted until 60 minutes of ultraviolet exposure.LMLPA5 displayed insensitivity to chloroform,confirming its non-enveloped phage morphology.The phages remained stable for over 8 months when store at 4 ℃ and-80 ℃.The biological characteristics and lysis capacity of phage LMLPA5 were elucidated in this study,which provide the basis for further application.
9.Drug resistance and phylo-typing of ESBL-producing Escherichia coli from diarrheic lambs in Kashgar area,Xinjiang
Yun HU ; Bai-Li ZHENG ; Wei-Li CHEN ; Ya-Ling CHENG ; Lan MA ; Pan-Pan TONG ; Ying-Yu LIU
Chinese Journal of Zoonoses 2024;40(8):716-722
The objective of this study was to determine the frequency and resistance patterns of ESBL-producing E.coli in lambs with diarrhea in the Kashi area,Xinjiang.The findings may provide guidance for the prevention and control of clinical E.coli disease.We collected 385 samples of perianal feces from lambs with diarrhea in the Kashgar area.From these samples,we isolated 371 strains of E.coli.We then used the double-paper-sheet synergistic method to screen for ESBL-producing E.coli.Additionally,we conducted analyses to identify drug-resistance genes,analyze drug resistance,and study the phylo-typing of the screened strains.Of 371 E.coli strains,204 were identified as ESBL-producing strains.The prevalence rates of blaCTX-M,blaCTX-M-1G,blaCTX-M-9G,and bla TEM resistance genes was 67.65%,69.12%,30.39%,and 63.73%,respectively.All ESBL-pro-ducing strains were resistant to multiple drugs,with resistance rates ranging from 90.69%to 100%for eight specific drugs:ampicillin,cefotaxime,gentamicin,enrofloxacin,azithromy-cin,tetracycline,chloramphenicol,methotrexate,and amitrazine.The phylogenetic subgroups of the strains were distributed primarily in groups A and D.Among group A strains,41.11%exhibited resistance to ten drugs,whereas among group D strains,40%exhibited resistance to 11 drugs.ESBL-pro-ducing strains of Escherichia coli are the main pathogens cau-sing diarrhea in lambs in the Kashgar region;group A is the main group,and all groups are multi-drug resistant.
10.Antimicrobial resistance and genomic characteristics of multidrug resistant diarrheagenic Escherichia coli from human and food samples in Henan Province
Hao-Yu QI ; Yan-Fen LI ; Yu WANG ; Zheng-Yong QIU ; Ying CUI ; Ling-Ling WU ; Meng ZHANG ; Yong-Li LI
Chinese Journal of Zoonoses 2024;40(8):723-731
This study was aimed at investigating the antimicrobial susceptibility and genomic characteristics of multidrug resistant diarrheagenic Escherichia coli isolated from human and food samples in Henan Province from 2017 to 2022.A total of 101 strains of multidrug resistant diarrheagenic E.coli were subjected to antimicrobial susceptibility testing with the broth di-lution method.Whole genome sequencing was performed to analyze the antimicrobial resistance genes,multilocus sequence typ-ing,and plasmid types.The sequencing data were used to construct a phylogenetic tree based on core genome single-nucleotide polymorphisms(cgSNPs).The isolates showed the highest resistance to ampicillin(87.1%),followed by tetracycline(79.2%)and nalidixic acid(64.4%).The resistance rate to cefotaxime was 38.6%.All 101 strains were classified into 60 STs,among which ST10,ST1491,and ST38 were dominant.Moreover,23 distinct plasmid replicons were identified,among which IncFIB was dominant.Diverse antimicrobial resistance genes(including quinolone,aminoglycoside,β-lactamase,and tetracycline)were identified.Insertion sequences(IS26,IS903B,and ISECP 1)were identified in upstream and downstream analysis of the gene context of the extended-spectrum β-lactamase bla CTX-M-14 and bla CTX-M-55 genes.In conclusion,multidrug resistant diarrhea-genic Escherichia coli isolated from clinical and food samples in Henan Province showed high genetic diversity and high antimi-crobial resistance.The dissemination of blaCTX-M carried by the strains was shown to be associated with the insertion sequence(IS).

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