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- Alizarin, which reduces ExoS, attenuates inflammation by P. aeruginosa in H292 cells
- Seung-Ho Kim, Hye In Ahn, Jae-Hoon Oh, Da Yun Seo, Jung-Hee Kim, Ok-kyoung Kwon, Ji-Won Park, Kyung-Seop Ahn
- J. Microbiol. 2025;63(5):e2411012. Published online May 27, 2025
- DOI: https://doi.org/10.71150/jm.2411012
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Abstract
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Pseudomonas aeruginosa (P. aeruginosa) is resistant to several drugs as well as antibiotics and is thus classified as multidrug resistant and extensively drug resistant. These bacteria have a secretion system called the "type 3 secretion system (T3SS)", which facilitates infection by delivering an effector protein. ExoenzymeS (ExoS) is known to induce cell death and activate caspase-1. In particular, patients infected with P. aeruginosa develop diseases associated with high mortality, such as pneumonia, because no drug targets an ExoS or T3SS. We selected natural compounds to treat T3SS-mediated pneumonia and chose alizarin, a red dye. We confirmed the effects of alizarin on T3SS by bacterial PCR and ELISA. It was confirmed that alizarin regulates ExoS by inhibiting exsA but also popD and pscF. Furthermore, in infected H292 cells, it not only attenuates inflammation by inhibiting lipopolysaccharide (LPS)-induced phosphorylation of nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) p65 but also interferes with the level of ExoS delivered into the host and modulates caspase-1. We confirmed this result and determined that it led to decreases in proinflammatory cytokines such as Interleukin-1beta (IL-1β), Interleukin-6 (IL-6), and Interleukin-18 (IL-18). Therefore, we suggest that alizarin is a suitable drug for treating pneumonia caused by P. aeruginosa because it helps to attenuate inflammation by regulating T3SS and NF-κB signaling.
- Lysobacter ciconiae sp. nov., and Lysobacter avium sp. nov., isolated from the faeces of an Oriental stork
- So-Yeon Lee , Pil Soo Kim , Hojun Sung , Dong-Wook Hyun , Jin-Woo Bae
- J. Microbiol. 2022;60(5):469-477. Published online March 31, 2022
- DOI: https://doi.org/10.1007/s12275-022-1647-5
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- 5 Web of Science
- 6 Crossref
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Abstract
- Two Gram-stain-negative, mesophilic, strictly aerobic, nonspore forming, and yellow-pigmented strains with rod-shaped cells, designated H21R20T and H23M41T, were isolated from the faeces of an Oriental stork (Ciconia boyciana). Based on 16S rRNA gene sequences, both strains showed the highest similarity (98.3−98.4%) to the type strain of Lysobacter concretionis. Phylogenetic analysis based on the 16S rRNA genes and 92 bacterial core genes showed that strains H21R20T and H23M41T were robustly clustered with L. concretionis Ko07T. Whole genome sequencing revealed that the genomes of both strains were approximately 2.9 Mb in size. The DNA G + C contents of the H21R20T and H23M41T strains were 67.3 and 66.6%, respectively. The two strains showed 80.1−81.7% average nucleotide identity with L. concretionis Ko07T. Strain H21R20T grew optimally at 30°C and pH 8.0 and in the presence of 0.5–3% (wt/vol) NaCl, while strain H23M41T grew optimally at 30°C and pH 7.0–8.0 and in the presence of 0–3% (wt/vol) NaCl. Both strains possessed iso-C15:0, iso-C16:0 and summed feature 9 (iso-C17:1 ω9c and/or C16:0 10-methyl) as the major cellular fatty acids, ubiquinone Q-8 as a predominant quinone, and diphosphatidylglycerol, phosphatidylglycerol, and phosphatidylethanolamine as the major polar lipids. A multifaceted investigation demonstrated that strains H21R20T and H23M41T represent novel species of the genus Lysobacter, for which we propose the names Lysobacter ciconiae sp. nov. and Lysobacter avium sp. nov. for strains H21R20T (= KCTC 82316T = JCM 34832T) and H23M41T (= KCTC 62676T = JCM 33223T), respectively.
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- Isolation and Characterization of an Antioxidant Aryl Polyene Pigment from Antarctic Bacterium Lysobacter sp. A03
Maria Elisa Pailliè-Jiménez, Paolo Stincone, Jamile Queiroz Pereira, Patricio Román Santagapita, Eliseu Rodrigues, Adriano Brandelli
Molecular Biotechnology.2024;[Epub] CrossRef -
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Folia Microbiologica.2023; 68(6): 991. CrossRef -
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International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef - Validation List no. 207. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, George Garrity
International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
- Isolation and Characterization of an Antioxidant Aryl Polyene Pigment from Antarctic Bacterium Lysobacter sp. A03
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