INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
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2025
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IF 5.2
Xiao-li Liu,Si-yi Wu,Zhan-peng Zou,Xiting Xian,Jingyuan Wang,Li Min,Yuanyuan Zhou,Kurt Houf,Zhongjia Yu
Proteus mirabilis , a well-known urinary tract pathogen, is increasingly recognized as a food safety concern due to its frequent detection in meat products, particularly poultry. Sporadic reports indicate gastrointestinal symptoms linked to P. mirabilis , but the relationship between its genome, antibiotic resistance, and variable pathogenicity remains unclear. In this study, 142 P. mirabilis isolates were collected from broiler carcasses and processing environments in wet markets and industrial facilities to assess contamination levels. Thirty-six representative isolates were characterized for genomic heterogeneity, antibiotic resistance, and virulence gene profiles using whole-genome sequencing and phenotypic susceptibility testing. Selected strains were further assessed for intestinal pathogenicity in a murine model. Broiler carcasses from wet markets had significantly higher contamination rates (80.77 %, 21/26) than industrial sources (41.67 %, 5/12), with all wet market samples (13/13) testing positive. Overall, 94.4 % of isolates were multidrug-resistant, with carcass isolates showing higher resistance than environmental isolates. Animal experiments demonstrated variable pathogenicity, including intestinal injury, villus disruption, epithelial shedding, goblet cell loss, inflammatory cytokine elevation, and gut dysbiosis. Dysbiosis induced by certain strains (e.g., R638) was linked to intestinal injury, as confirmed by fecal microbiota transplantation. These findings highlight P. mirabilis as a highly heterogeneous foodborne pathogen, emphasizing the need for targeted hygiene practices, particularly in wet market processing environments.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2023
·
IF 6.1
Mingzhu Zhu,Chen He,Jinchuan Zhou,Yi Li,Lilin Qian,Jiaozhen Zhang,Yanan Qiao,Wenqiang Chang,Hongxiang Lou
Liverwort secondary metabolites play an important role in the peaceful relationship between liverwort endophytic fungi and the host. This study identified potential antifungal agents based on interactions between host plants and endophytic fungi. Two endophytic fungi strains and 25 metabolites, including nine new compounds, were isolated from the Chinese liverwort Herbertus herpocladioides. Endophytic fungi were identified using internal transcribed spacer and whole-genome sequencing, and the compound structures were determined using comprehensive spectroscopic analysis coupled with electronic circular dichroism calculations. Among these compounds, compounds 10–13 exhibited potent antifungal activities. Compound 10, the most potent antifungal agent, disrupted fungal mitochondrial respiration by inhibiting the activity of mitochondrial complexes I and IV and resulted in the intracellular ATP content of endophytic fungi being significantly reduced. The in vivo results show that compound 10 protected fruits and animals from infection by phytopathogen Alternaria citriarbusti and human pathogen Candida albicans, respectively.
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mBio
·
2022
·Vol. 14
·期 1
·
IF 7.786
Hui Lu,Wanqian Li,Malcolm Whiteway,Hongkang Wang,Shuo Zhu,Zhe Ji,Yanru Feng,Lan Yan,Ting Fang,Liping Li,Tingjunhong Ni,Xiaolong Zhang,Quanzhen Lv,Zichao Ding,Lijuan Qiu,Dazhi Zhang,Yuanying Jiang
Fluconazole (FLC) is widely used to prevent and treat invasive fungal infections. However, FLC is a fungistatic agent, allowing clinical FLC-susceptible isolates to tolerate FLC. Making FLC fungicidal in combination with adjuvants is a promising strategy to avoid FLC resistance and eliminate the persistence and recurrence of fungal infections. Here, we identify a new small molecule compound, CZ66, that can make FLC fungicidal. The mechanism of action of CZ66 is targeting the C-4 sterol methyl oxidase, encoded by the ERG251 gene, resulting in decreased content of sterols with the 14α-methyl group and ultimately eliminating FLC tolerance of Candida albicans. CZ66 most likely interacts with Erg251 through residues Glu195, Gly206, and Arg241. Establishing Erg251 as a synergistic lethal target protein of FLC should direct research to identify specific small molecule inhibitors of 14α-methylsterol synthesis and open the way to abolishing fungal FLC tolerance.IMPORTANCE Fluconazole (FLC) tolerance increases the frequency of acquired FLC resistance, and a high FLC tolerance level is associated with persistent candidemia. Multiple functional proteins, such as calcineurin, heat shock protein 90 (Hsp90), and ADP ribosylation factor, are essential for the survival of C. albicans exposed to FLC, but how these factors increase the fungicidal activity of FLC remains to be determined. In this study, we found that 14α-methylsterols replace ergosterol to allow C. albicans to survive FLC, but Erg251 inactivated by CZ66 results in loss of 14α-methylsterol synthesis and cell death of C. albicans treated with FLC. Establishing Erg251 as a synergistic lethal target protein of FLC should direct research to identify specific small molecule inhibitors of 14α-methylsterol synthesis and open the way to abolishing fungal FLC tolerance.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Haifeng Lu,Qi Lu,Hongwu Sun,Zhongkun Wang,Xiang Shi,Yuling Ding,Xiang Ran,Jing Pei,Yubo Pan,Qunlin Zhang
Intracellular reactive oxygen species (ROS) are closely associated with cancer cell types. Therefore, ROS-based pattern recognition is a promising strategy for precise diagnosis of cancer, but such a possibility has never been reported yet. Herein, we proposed an ROS-responsive fluorescent sensor array based on pH-controlled histidine-templated gold nanoclusters (AuNCs@His) to distinguish cancer cell types and their proliferation states. In this strategy, three types of AuNCs@His with diverse fluorescence profiles were first synthesized by only adjusting the pH value. Upon the addition of various ROS, fluorescence quenching of three types of AuNCs@His occurred with different degrees, thereby forming unique optical “fingerprints”, which were well-clustered into several separated groups without overlap by principal component analysis (PCA). The sensing mechanism was attributable to the oxidation of AuNCs@His by ROS, as revealed by X-ray photoemission spectroscopy, Fourier transform infrared spectroscopy, 1H nuclear magnetic resonance spectroscopy, and electrospray ionization mass spectrometry. Based on the ROS-responsive sensing pattern, cancer cell types were successfully differentiated via PCA with 100% accuracy. Additionally, the proposed sensor array exhibited excellent performance in distinguishing the proliferation states of cancer cells, which was supported by the results of the Ki-67 immunohistochemistry assay. Overall, the ROS-responsive fluorescent sensor array can serve as a promising tool for precise diagnosis of cancer, indicating great potential for clinical application.
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Bioactive Materials
·
2022
·
IF 16.874
Xinhua Liu,Youteng Qin,Liyun Dong,Ziyi Han,Tianning Liu,Ying Tang,Yun Yu,Jingjie Ye,Juan Tao,Xuan Zeng,Jun Feng,Xian-Zheng Zhang
Many skin diseases, such as atopic dermatitis (AD), are featured with the dysbiosis of skin microbiota. The clinically recommended options for AD treatments suffer from poor outcomes and high side-effects, leading to severe quality-of-life impairment. To deal with this long-term challenge, we develop a living bacterial formulation ( [email protected] ) that integrates skin symbiotic bacteria of Roseomonas mucosa with poly(vinyl pyrrolidone), poly(vinyl alcohol) and sodium alginate into a skin dressing by virtue of the Ca 2+ -mediated cross-linking and the freezing-thawing (F-T) cycle method. [email protected] dressing creates a favorable condition to not only serve as extrinsic culture harbors but also as nutrient suppliers to support R . mucosa survival in the harsh microenvironment of AD sites to defeat S. aureus, which predominantly colonizes AD skins as an indigenous pathogen, mainly through the secretion of sphingolipids metabolites by R . mucosa like a therapeutics bio-factory. Meanwhile, this elaborately designed skin dressing could accelerate wound healing, normalize aberrant skin characters, recover skin barrier functions, alleviate AD-associated immune/inflammation responses, functioning like a combinational therapy. This study offers a promising means for the topical bacteria transplant to realize effective microbe biotherapy toward the skin diseases feature with microbe milieu disorders, including but not limited to AD disease.
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Frontiers in Endocrinology
·
2022
·
IF 6.055
Zhongjia Yu,Xiang-Fang Yu,Goher Kerem,Pei-Gen Ren
High-calorie intake has become one of the most common causes of dietary obesity, which eventually develops into type 2 diabetes mellitus (T2DM). Microbiota, along with the length of the gastrointestinal tract, is related to metabolic disorders, but its shifts and following impact on metabolic disorders due to external perturbation are still unclear. To evaluate shifts of microbiota from the proximal to the distal intestine and their impact on metabolic disorders, we profiled jejunal and colonic microbiota with the perturbation using high salt (HS) and antibiotic-induced microbiota depletion (AIMD) in diet-induced obesity (DIO) mice and analyzed the association with parameters of both obesity and blood glucose. After ten weeks of feeding DIO mice with HS intake and AIMD, they failed to develop obesity. The DIO mice with HS intake had T2DM symptoms, whereas the AIMD DIO mice showed no significant difference in blood glucose parameters. We observed that the jejunal and colonic microbiota had shifted due to settled perturbation, and jejunal microbiota within a group were more dispersed than colonic microbiota. After further analyzing jejunal microbiota using quantified amplicon sequencing, we found that the absolute abundance of Colidextribacter (R = 0.695, p = 0.001) and Faecalibaculum (R = 0.631, p = 0.005) in the jejunum was positively correlated with the changes in BW and FBG levels. The predicted pathway of glucose and metabolism of other substances significantly changed between groups (p <0.05). We demonstrated that the onset of obesity and T2DM in DIO mice is impeded when the gut microbiota is perturbed; thus, this pathogenesis depends on the gut microbiota.
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Frontiers in Microbiology
·
2022
·
IF 6.064
Guo Penghao,Chen Jianlong,Tan Yiwei,Xia Li,Zhang Weizheng,Li Xiaojie,Jiang Yujie,Li Ruiying,Chen Chunmei,Liao Kang,Peng Yaqin
Background: Fusarium species are opportunistic causative agents of superficial and disseminated human infections. Fast and accurate identification and targeted antifungal therapy give help to improve the patients’ prognosis.Objectives: This study aimed to evaluate the effectiveness of matrix-assisted laser desorption ionisation time of flight mass spectrometry (MALDI-TOF MS) for Fusarium identification, and investigate the epidemiology and antifungal susceptibility profiles of clinical Fusarium isolates in Southern China.Methods: There were 95 clinical Fusarium isolates identified by DNA sequencing of translation elongation factor 1-alpha (TEF1α) and MALDI-TOF MS, respectively. Antifungal susceptibility testing of isolates was performed by broth microdilution according to the CLSI approved standard M38-A3 document.Results: Seven species complexes (SC) with 17 Fusarium species were identified. The most prevalent SC was the F. solani SC (70.5%, 67/95), followed by the F. fujikuroi SC (16.8%, 16/95). F. keratoplasticum within the F. solani SC was the most prevalent species (32.6%, 31/95). There were 91.6% (87/95) of isolates identified by MALDI-TOF MS at the SC level. In most of species, amphotericin B and voriconazole showed lower MICs compared to itraconazole and terbinafine. The F. solani SC showed higher MICs to these antifungal agents compared to the other SCs. There were 10.5% (10/95) of strains with high MICs for amphotericin B (≥8 μg/ml), terbinafine (≥32 μg/ml) and itraconazole (≥32 μg/ml) simultaneously, mostly focusing on F. keratoplasticum (9/10).Conclusion: MALDI-TOF MS exhibited good performance on the identification of Fusarium strains at the SC level. The F. solani SC was the most prevalent clinical SC in Southern China. The MICs varied significantly among different species or SCs to different antifungal agents.
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Antibiotics-Basel
·
2023
·Vol. 12
·期 12
·1675
·
IF 4.8
Ting Fang,Juan Xiong,Li Wang,Zhe Feng,Sijin Hang,Jinhua Yu,Wanqian Li,Yanru Feng,Hui Lu,Yuanying Jiang
Candida albicansfilamentation plays a significant role in developing both mucosal and invasive candidiasis, making it a crucial virulence factor. Consequently, exploring and identifying inhibitors that impede fungal hyphal formation presents an intriguing approach toward antifungal strategies. In line with this anti-filamentation strategy, we conducted a comprehensive screening of a library of FDA-approved drugs to identify compounds that possess inhibitory properties against hyphal growth. The compound octenidine dihydrochloride (OCT) exhibits potent inhibition of hyphal growth inC. albicansacross different hyphae-inducing media at concentrations below or equal to 3.125 μM. This remarkable inhibitory effect extends to biofilm formation and the disruption of mature biofilm. The mechanism underlying OCT’s inhibition of hyphal growth is likely attributed to its capacity to impede ergosterol biosynthesis and induce the generation of reactive oxygen species (ROS), compromising the integrity of the cell membrane. Furthermore, it has been observed that OCT demonstrates protective attributes against invasive candidiasis inGalleria mellonellalarvae through its proficient eradication ofC. albicanscolonization in infectedG. mellonellalarvae by impeding hyphal formation. Although additional investigation is required to mitigate the toxicity of OCT in mammals, it possesses considerable promise as a potent filamentation inhibitor against invasive candidiasis.Keywords:octenidine dihydrochloride;anti-filamentation;Candida albicans;ergosterol biosynthesis
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BIOLOGICAL & PHARMACEUTICAL BULLETIN
·
2021
·Vol. 44
·期 3
·305-315
·
IF 2.233
Xin Yang,Zejun Pei,Renjing Hu,Zhehao Zhang,Zaixiang Lou,Xin Sun
In order to prevent and control the infection of Candida albicans, the antifungal activity, possible mechanism of myriocin against C. albicans and its biofilm were studied. The antifungal activity of myriocin was investigated by microdilution method. The effect of myriocin on fungal cell wall or membrane was evaluated by adding sorbitol, ergosterol or phytosphingosine (PHS). The damage to the cell membrane was investigated with propidium iodide (PI) staining and visualized by scanning electron microscope (SEM). The effects on biofilms and extracellular polysaccharides (EPS) were observed by crystal violet staining method and phenol-sulfuric acid method respectively. The adhesion of C. albicans cells to hydrocarbons was tested to evaluate cell surface hydrophobic (CSH). The combined effects of myriocin and antifungal drugs commonly used in clinical practice were investigated by using the checkerboard microdilution method. Minimal inhibitory concentrations (MICs) were found to be 0.125–4 µg/mL. Myriocin was found to affect both cell wall and cell membrane. After exposure to myriocin, biofilm and EPS were found to be inhibited and removed, and the CSH was decreased. The combined fungistasis of myriocin and voriconazole (VCZ) or amphotericin B (AMB) were additive. Myriocin had significant antifungal activity against C. albicans, and the antifungal mechanisms might be cell wall and membrane damage. Myriocin effectively inhibited and eliminated biofilms, and its mechanism may be related to the inhibition of EPS and CSH.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2019
·
IF 3.714
Chen Xing,Chunqing Qin,Xueqing Li,Fuming Zhang,Robert J. Linhardt,Peilong Sun,Anqiang Zhang
Bergamot essential oil (BEO), which is extracted from bergamot fruit peel, has many health benefits such as improving blood circulation and anticancer activity. In this paper, volatile components were obtained by headspace solid phase microextraction (HS-SPME) and ultrasound-assisted hydrodistillation (UAHD) from the fruits of bergamot ( Citrus medica L. var. sarcodactylis (Noot.) Swingle). The oil yield of BEO from UAHD extraction was 0.48%, which is 118% higher than that of hydrodistillation (HD). The chemical compositions of the volatile components were analyzed using GC-MS. A total of 46 volatile compounds belonging to distinct chemical families were identified. The major components were identified as d -limonene (60.44%), γ-terpinene (20.28%). The biological activities, including antimicrobial activities and antioxidant activities of BEO were detected. The BEO exhibited activities against bacteria and fungi with minimal inhibitory concentration (MIC) values in the range of 0.78–3.13 μL/mL and minimum bactericidal or fungicidal concentration (MBC/MFC) values in the range of 1.56–6.25 μL/mL. BEO showed strong activity against E. coli (MIC = 0.78 μL/mL, MBC = 1.56 μL/mL). BEO also showed substantial antioxidant activity based on ferric reducing antioxidant power (FRAP) assay for reducing power, 2,2′-azino-bis(3-ethyl benzothiazoline-6-sulfonic acid) (ABTS) assay for radical scavenging activity, and superoxide anion radical scavenging activity.
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MOLECULES
·
2019
·Vol. 24
·期 7
·1394
·
IF 3.06
Xiaowen He,Lantong Zhang,Jinping Chen,Jinlei Sui,Guohui Yi,Jinyan Wu,Yinzheng Ma
Essential oils (EOs) have been shown to have a diversity of beneficial human health effects.Clausenais a large and highly diverse genus of plants with medicinal and cosmetic significance. The aim of this study was to analyze the composition ofClausena lansiumEOs and to investigate their potential antifungal effects. The chemical compositions ofClausena lansiumEOs obtained by hydrodistillation were analyzed by gas chromatography-mass spectrometry (GC-MS). A total of 101 compounds were identified among the diverse extracts ofC. lansium. EOs of leaves and pericarps from different cultivars (Hainan local wampee and chicken heart wampee) collected in Hainan (China) were classified into four clusters based on their compositions. These clusters showed different antifungal activities against fiveCandidaspecies (C. albicans,C. tropicalis,C. glabrata,C. kruseiandC. parapsilosis) using the disc diffusion method.Clausena lansiumEOs of pericarps displayed noteworthy antifungal activitives against all the testedCandidastrains with inhibition zone diameters in the range of 11.1–23.1 mm. EOs of leaves showed relatively low antifungal activities with inhibition zone diameters in the range of 6.5–22.2 mm. The rank order of antifungal activities among the four EO clusters was as follows: Cluster IV> Cluster III > Cluster I ≥ Cluster II. These results represent the first report about the correlation between chemical composition ofC. lansiumEOs and antifungal activity. Higher contents of β-phellandrene, β-sesquiphellandrene and β-bisabolene in EOs of pericarps were likely responsible for the high antifungal activity of Cluster IV EOs. Taken together, our results demonstrate the chemical diversity ofClausena lansiumEOs and their potential as novel antifungal agents for candidiasis caused byCandidaspp. Furthermore, the obtained results showing a wide spectrum of antifungal activities provide scientific evidence for the traditional use of these plants.Keywords:correlation;Clausena lansium;essential oil;antifungal activity;Candidaspp.
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MOLECULAR MICROBIOLOGY
·
2016
·Vol. 103
·期 4
·713-728
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IF 3.761
Tan-Jun Wang,Yi-Ming Shan,Han Li,Wei-Wang Dou,Xin-Hang Jiang,Xu-Ming Mao,Shui-Ping Liu,Wen-Jun Guan,Yong-Quan Li
Summary Antibiotic-producing microorganisms have evolved several self-resistance mechanisms to prevent auto-toxicity. Overexpression of specific transporters to improve the efflux of toxic antibiotics has been found one of the most important and intrinsic resistance strategies used by many Streptomyces strains. In this work, two ATP-binding cassette (ABC) transporter-encoding genes located in the natamycin biosynthetic gene cluster, scnA and scnB , were identified as the primary exporter genes for natamycin efflux in Streptomyces chattanoogensis L10. Two other transporters located outside the cluster, a major facilitator superfamily transporter Mfs1 and an ABC transporter NepI/II were found to play a complementary role in natamycin efflux. ScnA/ScnB and Mfs1 also participate in exporting the immediate precursor of natamycin, 4,5-de-epoxynatamycin, which is more toxic to S. chattanoogensis L10 than natamycin. As the major complementary exporter for natamycin efflux, Mfs1 is up-regulated in response to intracellular accumulation of natamycin and 4,5-de-epoxynatamycin, suggesting a key role in the stress response for self-resistance. This article discusses a novel antibiotic-related efflux and response system in Streptomyces , as well as a self-resistance mechanism in antibiotic-producing strains.
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