Journal of Microbiology

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miR-135b Aggravates Fusobacterium nucleatum-Induced Cisplatin Resistance in Colorectal Cancer by Targeting KLF13: Wei Zeng , Jia Pan , Guannan Ye; J. Microbiol. 2024;62(2):63-73. Published online February 24, 2024; DOI: https://doi.org/10.1007/s12275-023-00100-1

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Cisplatin resistance is the main cause of colorectal cancer (CRC) treatment failure, and the cause has been reported to be related to Fusobacterium nucleatum (Fn) infection. In this study, we explored the role of Fn in regulating cisplatin resistance of CRC cells and its underlying mechanism involved. The mRNA and protein expressions were examined by qRT-PCR and western blot. Cell proliferation and cell apoptosis were assessed using CCK8 and flow cytometry assays, respectively. Dual-luciferase reporter gene assay was adopted to analyze the molecular interactions. Herein, our results revealed that Fn abundance and miR-135b expression were markedly elevated in CRC tissues, with a favorable association between the two. Moreover, Fn infection could increase miR-135b expression via a concentration-dependent manner, and it also enhanced cell proliferation but reduced apoptosis and cisplatin sensitivity by upregulating miR-135b. Moreover, KLF13 was proved as a downstream target of miR-135b, of which overexpression greatly diminished the promoting effect of miR-135b or Fn-mediated cisplatin resistance in CRC cells. In addition, it was observed that upstream 2.5 kb fragment of miR-135b promoter could be interacted by β-catenin/TCF4 complex, which was proved as an effector signaling of Fn. LF3, a blocker of β-catenin/TCF4 complex, was confirmed to diminish the promoting role of Fn on miR-135b expression. Thus, it could be concluded that Fn activated miR-135b expression through TCF4/β-catenin complex, thereby inhibiting KLF13 expression and promoting cisplatin resistance in CRC.

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miR-135b: A key role in cancer biology and therapeutic targets
Yingchun Shao, Shuangshuang Zhang, Yuxin Pan, Zhan Peng, Yinying Dong
Non-coding RNA Research.2025; 12: 67. CrossRef
miR‐135b: A Potential Biomarker for Pathological Diagnosis and Biological Therapy
Dezhi Yan, Qingliu He, Chunjian Wang, Tian Li, Xueping Yi, Haisheng Yu, Wenfei Wu, Hanyun Yang, Wenzhao Wang, Liang Ma
WIREs RNA.2025;[Epub] CrossRef
Emerging roles of intratumor microbiota in cancer: tumorigenesis and management strategies
Zhuangzhuang Shi, Zhaoming Li, Mingzhi Zhang
Journal of Translational Medicine.2024;[Epub] CrossRef
Fusobacterium nucleatum: a novel regulator of antitumor immune checkpoint blockade therapy in colorectal cancer
Mengjie Luo
American Journal of Cancer Research.2024; 14(8): 3962. CrossRef
Antioxidant Role of Probiotics in Inflammation-Induced Colorectal Cancer
Sevag Hamamah, Andrei Lobiuc, Mihai Covasa
International Journal of Molecular Sciences.2024; 25(16): 9026. CrossRef
Identification of Penexanthone A as a Novel Chemosensitizer to Induce Ferroptosis by Targeting Nrf2 in Human Colorectal Cancer Cells
Genshi Zhao, Yanying Liu, Xia Wei, Chunxia Yang, Junfei Lu, Shihuan Yan, Xiaolin Ma, Xue Cheng, Zhengliang You, Yue Ding, Hongwei Guo, Zhiheng Su, Shangping Xing, Dan Zhu
Marine Drugs.2024; 22(8): 357. CrossRef

Saccharibacillus brassicae sp. nov., an endophytic bacterium isolated from kimchi cabbage (Brassica rapa subsp. pekinensis) seeds: Lingmin Jiang , Chan Ju Lim , Song-Gun Kim , Jae Cheol Jeong , Cha Young Kim , Dae-Hyuk Kim , Suk Weon Kim , Jiyoung Lee; J. Microbiol. 2020;58(1):24-29. Published online November 25, 2019; DOI: https://doi.org/10.1007/s12275-020-9346-6

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Abstract

Strain ATSA2T was isolated from surface-sterilized kimchi cabbage (Brassica rapa subsp. pekinensis) seeds and represents a novel bacterium based on the polyphasic taxonomic approach. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain ATSA2T formed a lineage within genus Saccharibacillus and was most closely to Saccharibacillus deserti WLG055T (98.1%) and Saccharibacillus qingshengii H6T (97.9%). The whole-genome of ATSA2T comprised a 5,619,468 bp of circular chromosome with 58.4% G + C content. The DNA-DNA relatedness values between strain ATSA2T and its closely related type strains S. deserti WLJ055T and S. qingshengii H6T were 26.0% and 24.0%, respectively. Multiple gene clusters associated with plant growth promotion activities (stress response, nitrogen and phosphorus metabolism, and auxin biosynthesis) were annotated in the genome. Strain ATSA2T was Gram-positive, endospore-forming, facultatively anaerobic, and rod-shaped. It grew at 15–37°C (optimum 25°C), pH 6.0–10.0 (optimum pH 8.0), and in the presence of 0–5% (w/v) NaCl (optimum 1%). The major cellular fatty acids (> 10%) of strain ATSA2T were anteiso- C15:0 and C16:0. MK-7 was the major isoprenoid quinone. The major polar lipids present were diphosphatidylglycerol, phosphatidylglycerol, and three unknown glycolipids. Based on its phylogenetic, genomic, phenotypic, and chemotaxonomic features, strain ATSA2T is proposed to represent a novel species of genus Saccharibacillus, for which the name is Saccharibacillus brassicae sp. nov. The type strain is ATSA2T (KCTC 43072T = CCTCC AB 2019223T).

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Improving plant salt tolerance through Algoriphagus halophytocola sp. nov., isolated from the halophyte Salicornia europaea
Yuxin Peng, Dong Hyun Cho, Zalfa Humaira, Yu Lim Park, Ki Hyun Kim, Cha Young Kim, Jiyoung Lee
Frontiers in Microbiology.2024;[Epub] CrossRef
Dasania phycosphaerae sp. nov., isolated from phytoplankton sample from the south coast of the Republic of Korea
Yue Jiang, Yong Guan, Sungmo Kang, Mi-Kyung Lee, Ki-Hyun Kim, Zhun Li
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Genome insights into the plant growth-promoting bacterium Saccharibacillus brassicae ATSA2T
Lingmin Jiang, Jiyoon Seo, Yuxin Peng, Doeun Jeon, Soon Ju Park, Cha Young Kim, Pyoung Il Kim, Chul Hong Kim, Ju Huck Lee, Jiyoung Lee
AMB Express.2023;[Epub] CrossRef
Emticicia fluvialis sp. nov., a potential hormone-degrading bacterium isolated from Nakdong River, Republic of Korea
Hyun-Sun Baek, Yong Guan, Min-Ju Kim, Yue Jiang, Mi-Kyung Lee, Ki-Hyun Kim, Jaeyoon Lee, Yuna Shin, Yoon-Ho Kang, Zhun Li
Antonie van Leeuwenhoek.2023; 116(12): 1317. CrossRef
Identification and genomic analysis of Pseudosulfitobacter koreense sp. nov. isolated from toxin-producing dinoflagellate Alexandrium pacificum
Yue Jiang, Zhun Li
Archives of Microbiology.2023;[Epub] CrossRef
Gymnodinialimonas phycosphaerae sp. nov., a phycosphere bacterium isolated from Karlodinium veneficum
Yuxin Peng, Lingmin Jiang, Yue Jiang, Jiyoon Seo, Doeun Jeon, Young-Min Kim, Zhun Li, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Flavobacterium endoglycinae sp. nov., an endophytic bacterium isolated from soybean (Glycine max L. cv. Gwangan) stems
Jiyoon Seo, Yuxin Peng, Lingmin Jiang, Sang-Beom Lee, Rae-Dong Jeong, Soon Ju Park, Cha Young Kim, Man-Soo Choi, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
Gymnodinialimonas ceratoperidinii gen. nov., sp. nov., isolated from rare marine dinoflagellate Ceratoperidinium margalefii
Yue Jiang, Yuxin Peng, Hyeon Ho Shin, Hyun Jung Kim, Ki-Hyun Kim, Lingmin Jiang, Jiyoung Lee, Zhun Li
Archives of Microbiology.2022;[Epub] CrossRef
Flagellatimonas centrodinii gen. nov., sp. nov., a novel member of the family Nevskiaceae isolated from toxin-producing dinoflagellate Centrodinium punctatum
Yue Jiang, Lingmin Jiang, Yuxin Peng, Ki-Hyun Kim, Hyeon Ho Shin, Young-Min Kim, Jiyoung Lee, Zhun Li
International Journal of Systematic and Evolutionary Microbiology .2021;[Epub] CrossRef
Pedobacter endophyticus sp. nov., an endophytic bacterium isolated from Carex pumila
Yuxin Peng, Lingmin Jiang, Jiyoon Seo, Zhun Li, Hanna Choe, Jae Cheol Jeong, Suk Weon Kim, Young-Min Kim, Cha Young Kim, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2021;[Epub] CrossRef
Neobacillus endophyticus sp. nov., an endophytic bacterium isolated from Selaginella involvens roots
Lingmin Jiang, Myoung Hui Lee, Jae Cheol Jeong, Dae-Hyuk Kim, Cha Young Kim, Suk Weon Kim, Jiyoung Lee
International Journal of Systematic and Evolutionary Microbiology .2019;[Epub] CrossRef

Host-specificity of symbiotic mycorrhizal fungi for enhancing seed germination, protocorm formation and seedling development of over-collected medicinal orchid, Dendrobium devonianum: Hui Huang , Xiao-Meng Zi , Hua Lin , Jiang-Yun Gao; J. Microbiol. 2018;56(1):42-48. Published online January 4, 2018; DOI: https://doi.org/10.1007/s12275-018-7225-1

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Abstract

All orchids maintain an obligate relationship with mycorrhizal symbionts during seed germination. In most cases, germination-enhancing fungi have been isolated from roots of mature plants for conservation and cultivation purposes. To understand the germination biology of Dendrobium devonianum, an over-collected medicinal orchid, the seeds of D. devonianum were inoculated with a fungal strain (FDd1) isolated from naturally occurring protocorms of D. devonianum and two other germination-enhancing fungal strains (FDaI7 and FCb4) from D. aphyllum and Cymbidium mannii, respectively. The fungal strain was isolated from five protocorms of D. devonianum and identified as a species of the genus Epulorhiza. In germination trials, treatments with all of the three fungal strains showed a significant promoting effect on seed germination and protocorm formation, compared with the control treatment (no inoculation). However, FDd1 fungal strain showed the greatest effectiveness followed by FDaI7 and FCb4. For all inoculation and control treatments, seeds developed to protocorms regardless of the presence of illumination, whereas protocorms did not develop to seedlings unless illumination was provided. The results of our manipulative experiments confirmed the hypothesis that mycorrhizae associated with orchid seedlings are highly host-specific, and the degree of specificity may be life stagespecific under in vitro conditions. The specific mycorrhizal symbionts from protocorms can enhance restoration efforts and the conservation of orchids such as D. devonianum.

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Research Support, Non-U.S. Gov'ts

Characterization and Screening of Plant Probiotic Traits of Bacteria Isolated from Rice Seeds Cultivated in Argentina: Dante Ruiza , Betina Agaras , Patrice de Werrab , Luis G. Wall , Claudio Valverde; J. Microbiol. 2011;49(6):902-912. Published online December 28, 2011; DOI: https://doi.org/10.1007/s12275-011-1073-6

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Abstract

Many seeds carry endophytes, which ensure good chances of seedling colonization. In this work, we have studied the seed-borne bacterial flora of rice varieties cultivated in the northeast of Argentina. Surface-sterilized husked seeds of the rice cultivars CT6919, El Paso 144, CAMBA, and IRGA 417 contained an average of 5×106 CFU/g of mesophilic and copiotrophic bacteria. Microbiological, physiological, and molecular characterization of a set of 39 fast-growing isolates from the CT6919 seeds revealed an important diversity of seed-borne mesophiles and potential plant probiotic activities, including diazotrophy and antagonism of fungal pathogens. In fact, the seed-borne bacterial flora protected the rice seedlings against Curvularia sp. infection. The root colonization pattern of 2 Pantoea isolates from the seeds was studied by fluorescence microscopy of the inoculated axenic rice seedlings. Both isolates strongly colonized the site of emergence of the lateral roots and lenticels, which may represent the entry sites for endophytic spreading. These findings suggest that rice plants allow grain colonization by bacterial species that may act as natural biofertilizers and bioprotectives early from seed germination.

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Differential Response of Etiolated Pea Seedlings to Inoculation with Rhizobacteria Capable of Utilizing 1-Aminocyclopropane-1-Carboxylate or L-Methionine: Baby Shaharoona , Muhammad Arshad , Azeem Khalid; J. Microbiol. 2007;45(1):15-20.; DOI: https://doi.org/2497 [pii]

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Abstract: The majority of soil microorganisms can derive ethylene from L-methionine (L-MET), while some rhizobacteria can hydrolyze 1-aminocyclopropane-1-carboxylate (ACC) due to their ACC-deaminase activity. In this study, three strains having either ACC-deaminase activity (Pseudomonas putida biotype A, A7), or the ability to produce ethylene from L-MET (Acinetobacter calcoaceticus, M9) or both (Pseudomonas fluorescens, AM3) were used for inoculation. The highly ethylene specific bioassay of a classical “triple” response in pea seedlings was used to investigate the effect of the inoculation with the rhizobacteria in the presence of 10 mM ACC or L-MET. The exogenous application of ACC had a concentration-dependent effect on the etiolated pea seedlings in creating the classical “triple” response. The inoculation with P. putida diluted the effect of ACC, which was most likely due to its ACC-deaminase activity. Similarly, the application of Co2+ reduced the ACC-imposed effect on etiolated pea seedlings. In contrast, the inoculation of A. calcoaceticus or P. fluorescens in the presence of L-MET caused a stronger classical “triple” response in etiolated pea seedlings; most likely by producing ethylene from L-MET. This is the first study, to our knowledge, reporting on the comparative effect of rhizobacteria capable of utilizing ACC vs L-MET on etiolated pea seedlings.

Determination of Carbon Source Utilization of Bacillus and Pythium Species by Biolog?Microplate Assay: Se-Chul Chun , R.W. Schneider , Ill-Min Chung; J. Microbiol. 2003;41(3):252-258.

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Abstract: The carbon utilizations of Bacillus species and Pythium species were investigated by using a Biolog? microplate assay to determine if there are differences in the carbon utilizations of selected strains of these species. It may be possible to afford a competitive advantage to bacterial biological control agents by providing them with a substrate that they can readily use as a carbon source, for example, in a seed coating formulation. Microplates, identified as SFP, SFN and YT were used to identify spore-forming bacteria, nonspore-forming bacteria, and yeast, respectively. Bacterial and mycelial suspensions were adjusted to turbidities of 0.10 to 0.11 at 600 nm. One hundred microliters of each of the bacterial and mycelial suspension were inoculated into each well of each of the three types of microplates. L-arabinose, D-galactose, D-melezitose and D-melibiose of the 147 carbohydrates tested were found to be utilized only by bacteria, and not by Pythium species, by Biolog? microplate assay, and this was confirmed by traditional shake flask culture. Thus, it indicated that the Biolog? microplate assay could be readily used to search for specific carbon sources that could be utilized to increase the abilities of bacterial biological control agents to adapt to contrived environments.

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