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Sisli Etfal Hastanesi Tip Bulteni 2024Anthrax is a rare zoonotic disease in humans caused by Bacillus anthracis. The most common form of this disease is cutaneous anthrax. Rarely, eye involvement may occur....
Anthrax is a rare zoonotic disease in humans caused by Bacillus anthracis. The most common form of this disease is cutaneous anthrax. Rarely, eye involvement may occur. In this case, a nine-year-old male patient with anthrax on his left eyelids is presented. From the patient's history, it was learned that a slight papular reaction occurred on the left side of the eye, then the lesion enlarged within three days, and edema developed around the eye. On the fifth day of the patient's preseptal cellulitis diagnosis, progress in eye lesions and necrosis and eschar formation around the eyes were detected, while Bacillus anthracis polymerase chain reaction (PCR) positivity was detected on the fifth day of the patient's complaints. The patient was treated with ciprofloxacin and clindamycin and a clinical response was achieved. Anthrax should be kept in mind in the differential diagnosis of preseptal and orbital cellulitis, especially in patients who have close contact with animals. If palpebral anthrax is not treated effectively on time, it can leave scars on the eyelids and cause permanent deformities and loss of function. Early diagnosis and initiation of antibiotic therapy significantly reduce the occurrence of complications. In this case report, a pediatric case with eyelid anthrax, which is rarely seen in anthrax disease, is presented.
PubMed: 38808049
DOI: 10.14744/SEMB.2023.51261 -
Microbial Ecology May 2024Water-filled sinkholes known locally as cenotes, found on the Yucatán Peninsula, have remarkable biodiversity. The primary objective of this study was to explore the...
Water-filled sinkholes known locally as cenotes, found on the Yucatán Peninsula, have remarkable biodiversity. The primary objective of this study was to explore the biotechnological potential of Gram-positive cultivable bacteria obtained from sediment samples collected at the coastal cenote Pol-Ac in Yucatán, Mexico. Specifically, the investigation aimed to assess production of hydrolytic enzymes and antimicrobial compounds. 16 S rRNA gene sequencing led to the identification of 49 Gram-positive bacterial isolates belonging to the phyla Bacillota (n = 29) and Actinomycetota (n = 20) divided into the common genera Bacillus and Streptomyces, as well as the genera Virgibacillus, Halobacillus, Metabacillus, Solibacillus, Neobacillus, Rossellomorea, Nocardiopsis and Corynebacterium. With growth at 55ºC, 21 of the 49 strains were classified as moderately thermotolerant. All strains were classified as halotolerant and 24 were dependent on marine water for growth. Screening for six extracellular hydrolytic enzymes revealed gelatinase, amylase, lipase, cellulase, protease and chitinase activities in 93.9%, 67.3%, 63.3%, 59.2%, 59.2% and 38.8%, of isolated strains, respectively. The genes for polyketide synthases type I, were detected in 24 of the strains. Of 18 strains that achieved > 25% inhibition of growth in the bacterial pathogen Staphylococcus aureus ATCC 6538, 4 also inhibited growth in Escherichia coli ATCC 35,218. Isolates Streptomyces sp. NCA_378 and Bacillus sp. NCA_374 demonstrated 50-75% growth inhibition against at least one of the two pathogens tested, along with significant enzymatic activity across all six extracellular enzymes. This is the first comprehensive report on the biotechnological potential of Gram-positive bacteria isolated from sediments in the cenotes of the Yucatán Peninsula.
Topics: Geologic Sediments; Mexico; Biodiversity; Gram-Positive Bacteria; RNA, Ribosomal, 16S; Bioprospecting; Phylogeny; Anti-Bacterial Agents; Seawater
PubMed: 38806738
DOI: 10.1007/s00248-024-02392-1 -
Communications Biology May 2024The gut microbiota influences human health and the development of chronic diseases. However, our understanding of potentially protective or harmful microbe-host...
The gut microbiota influences human health and the development of chronic diseases. However, our understanding of potentially protective or harmful microbe-host interactions at the molecular level is still in its infancy. To gain further insights into the hidden gut metabolome and its impact, we identified a cryptic non-ribosomal peptide BGC in the genome of Bacillus cereus DSM 28590 from the mouse intestine ( www.dsmz.de/miBC ), which was predicted to encode a thiazol(in)e substructure. Cloning and heterologous expression of this BGC revealed that it produces bacillamide D. In-depth functional evaluation showed potent cytotoxicity and inhibition of cell migration using the human cell lines HCT116 and HEK293, which was validated using primary mouse organoids. This work establishes the bacillamides as selective cytotoxins from a bacterial gut isolate that affect mammalian cells. Our targeted structure-function-predictive approach is demonstrated to be a streamlined method to discover deleterious gut microbial metabolites with potential effects on human health.
Topics: Bacillus cereus; Animals; Mice; Humans; HEK293 Cells; Gastrointestinal Microbiome; Cytotoxins; HCT116 Cells; Intestines; Cell Movement; Organoids
PubMed: 38806706
DOI: 10.1038/s42003-024-06208-3 -
Scientific Reports May 2024In the present study, ten (10) selected bacteria isolated from chasmophytic wild Chenopodium were evaluated for alleviation of drought stress in chickpea. All the...
In the present study, ten (10) selected bacteria isolated from chasmophytic wild Chenopodium were evaluated for alleviation of drought stress in chickpea. All the bacterial cultures were potential P, K and Zn solubilizer. About 50% of the bacteria could produce Indole-3-acetic acid (IAA) and 1-aminocyclopropane-1-carboxylate (ACC) deaminase. The bacteria showed wide range of tolerance towards pH, salinity, temperature and osmotic stress. Bacillus paralicheniformis L38, Pseudomonas sp. LN75, Enterobacter hormachei subsp. xiangfengensis LJ89, B. paramycoides L17 and Micrococcus luteus LA9 significantly improved growth and nutrient (N, P, K, Fe and Zn) content in chickpea under water stress during a green house experiment conducted following a completely randomized design (CRD). Application of Microbacterium imperiale LJ10, B. stercoris LN74, Pseudomonas sp. LN75, B. paralicheniformis L38 and E. hormachei subsp. xiangfengensis LJ89 reduced the antioxidant enzymes under water stress. During field experiments conducted following randomized block design (RBD), all the bacterial inoculations improved chickpea yield under water stress. Highest yield (1363 kg ha) was obtained in plants inoculated with Pseudomonas sp. LN75. Pseudomonas sp. LN75, B. paralicheniformis L38 and E. hormachei subsp. xiangfengensis LJ89 have potential as microbial stimulants to alleviate the water stress in chickpea. To the best of our knowledge this is the first report of using chasmophyte associated bacteria for alleviation of water stress in a crop plant.
Topics: Cicer; Droughts; Stress, Physiological; Bacteria; Indoleacetic Acids; Nutrients; Carbon-Carbon Lyases; Enterobacter; Pseudomonas; Antioxidants
PubMed: 38806526
DOI: 10.1038/s41598-024-58695-3 -
Two Case Reports of Ochrobactrum anthropi Bacteremia in a Tertiary Care Hospital in Northeast India.Cureus Apr 2024is a non-fermenting, Gram-negative bacillus and an emerging opportunistic pathogen. We have isolated this organism from the blood cultures of two patients, a...
is a non-fermenting, Gram-negative bacillus and an emerging opportunistic pathogen. We have isolated this organism from the blood cultures of two patients, a 53-year-old immunocompetent male presenting with an episode of mild fever post craniotomy and an 85-year-old male with chronic obstructive pulmonary disease (COPD) and urinary retention on an indwelling catheter. The organism was identified using VITEK 2 (bioMérieux, France). Both the isolates were resistant to most of the β-lactams, including cephalosporins, and sensitive to quinolones, aminoglycosides, and carbapenems.
PubMed: 38803726
DOI: 10.7759/cureus.59123 -
Frontiers in Plant Science 2024This study used DGL1 isolated from the arid sandy land of the Qinghai-Tibetan Plateau as the research strain and investigated the effects of DGL1 on the biomass,...
INTRODUCTION
This study used DGL1 isolated from the arid sandy land of the Qinghai-Tibetan Plateau as the research strain and investigated the effects of DGL1 on the biomass, physiology, and metabolites of under different intensities of drought stress to provide a high-quality bacterial source and a theoretical basis for the research and development of biological fertilizer suitable for arid areas.
METHODS
The exopolysaccharides (EPS), 1-Aminocyclopropane-1-carboxylate deaminase (ACC), and phosphorus solubilizing capacity of DGL1 were determined. The effects of a DGL1 suspension on alfalfa biomass, physiological indexes, degree of peroxidation of cell membranes, and activity of antioxidant enzymes were determined after irrigating roots under drought stress. The effects on soil physicochemical properties were also evaluated, and metabolomics analysis was performed to explore the effect of DGL1 on the metabolites of alfalfa under drought stress.
RESULTS
Strain DGL1 produced extracellular polysaccharide EPS and ACC deaminase and was capable of phosphorus solubilization. Treatment with DGL1 increased the biomass of alfalfa under different degrees of drought stress, significantly increased the activities of alfalfa antioxidant enzymes (SOD), Peroxidase (POD), and catalase (CAT), reduced the content of MDA and HO, and increased the content of quick-acting phosphorus, quick-acting potassium, ammonium nitrogen, and nitrate nitrogen in the soil, thus improving soil fertility. Through metabolomics analysis, DGL1 was shown to affect amino acid metabolic pathways, such as arginine, leucine, glutamate, and tyrosine, as well as the levels of energy-providing polysaccharides and lipids, in alfalfa under 15% PEG-6000 drought stress, enhancing alfalfa's capacity to resist drought stress.
DISCUSSION
Strain DGL1 enhances the drought suitability of alfalfa and has the potential for dryland development as a biological agent.
PubMed: 38803604
DOI: 10.3389/fpls.2024.1378707 -
Frontiers in Immunology 2024The possible protective effect of interleukin-32 (IL-32) in () infection has been indicated. However, few studies have been focused on IL-32 in tuberculosis patients....
The possible protective effect of interleukin-32 (IL-32) in () infection has been indicated. However, few studies have been focused on IL-32 in tuberculosis patients. Additionally, the regulation of IL-32 production has rarely been reported. In the present study, the production, regulation, and role of IL-32 in tuberculous pleurisy (TBP) were investigated. We found that the content of IL-32 in tuberculous pleural effusion (TPE) was higher than the level in the malignant pleural effusion and transudative pleural effusion. The level of IL-32 mRNA in pleural fluid mononuclear cells (PFMCs) was higher than that in peripheral blood mononuclear cells (PBMCs) of patients with TBP, and this difference was mainly reflected in the splice variants of IL-32α, IL-32β, and IL-32γ. Compared with the PBMCs, PFMCs featured higher IL-32β/IL-32γ and IL-32α/IL-32γ ratios. In addition, lipopolysaccharide (LPS), Bacillus Calmette-Guérin (BCG), and H37Ra stimulation could induce IL-32 production in the PFMCs. IL-32 production was positively correlated with the TNF-α, IFN-γ, and IL-1Ra levels in TPE, whereas IFN-γ, but not TNF-α or IL-1Ra, could induce the production of IL-32 in PFMCs. Furthermore, IL-32γ could induce the TNF-α production in PFMCs. Monocytes and macrophages were the main sources of IL-32 in PFMCs. Nevertheless, direct cell-cell contact between lymphocytes and monocytes/macrophages plays an important role in enhancing IL-32 production by monocyte/macrophage cells. Finally, compared with the non-tuberculous pleural effusion, the purified CD4 and CD8 T cells in TPE expressed higher levels of intracellular IL-32. Our results suggested that, as a potential biomarker, IL-32 may play an essential role in the protection against infection in patients with TBP. However, further studies need to be carried out to clarify the functions and mechanisms of the IFN-γ/IL-32/TNF-α axis in patients with TBP.
Topics: Humans; Interleukins; Tuberculosis, Pleural; Male; Female; Middle Aged; Adult; Pleural Effusion; Leukocytes, Mononuclear; Mycobacterium tuberculosis; Aged; Interferon-gamma
PubMed: 38803498
DOI: 10.3389/fimmu.2024.1342641 -
Nature Communications May 2024Bacterial-fungal interactions influence microbial community performance of most ecosystems and elicit specific microbial behaviours, including stimulating specialised...
Bacterial-fungal interactions influence microbial community performance of most ecosystems and elicit specific microbial behaviours, including stimulating specialised metabolite production. Here, we use a co-culture experimental evolution approach to investigate bacterial adaptation to the presence of a fungus, using a simple model of bacterial-fungal interactions encompassing the bacterium Bacillus subtilis and the fungus Aspergillus niger. We find in one evolving population that B. subtilis was selected for enhanced production of the lipopeptide surfactin and accelerated surface spreading ability, leading to inhibition of fungal expansion and acidification of the environment. These phenotypes were explained by specific mutations in the DegS-DegU two-component system. In the presence of surfactin, fungal hyphae exhibited bulging cells with delocalised secretory vesicles possibly provoking an RlmA-dependent cell wall stress. Thus, our results indicate that the presence of the fungus selects for increased surfactin production, which inhibits fungal growth and facilitates the competitive success of the bacterium.
Topics: Bacillus subtilis; Aspergillus niger; Lipopeptides; Adaptation, Physiological; Peptides, Cyclic; Hyphae; Microbial Interactions; Bacterial Proteins; Coculture Techniques; Mutation; Cell Wall
PubMed: 38802389
DOI: 10.1038/s41467-024-48812-1 -
Applied Microbiology and Biotechnology May 2024Modulating the soil microbiome by applying microbial inoculants has gained increasing attention as eco-friendly option to improve soil disease suppressiveness....
Modulating the soil microbiome by applying microbial inoculants has gained increasing attention as eco-friendly option to improve soil disease suppressiveness. Currently, studies unraveling the interplay of inoculants, root-associated microbiome, and plant response are lacking for apple trees. Here, we provide insights into the ability of Bacillus velezensis FZB42 or Pseudomonas sp. RU47 to colonize apple root-associated microhabitats and to modulate their microbiome. We applied the two strains to apple plants grown in soils from the same site either affected by apple replant disease (ARD) or not (grass), screened their establishment by selective plating, and measured phytoalexins in roots 3, 16, and 28 days post inoculation (dpi). Sequencing of 16S rRNA gene and ITS fragments amplified from DNA extracted 28 dpi from different microhabitat samples revealed significant inoculation effects on fungal β-diversity in root-affected soil and rhizoplane. Interestingly, only in ARD soil, most abundant bacterial amplicon sequence variants (ASVs) changed significantly in relative abundance. Relative abundances of ASVs affiliated with Enterobacteriaceae were higher in rhizoplane of apple grown in ARD soil and reduced by both inoculants. Bacterial communities in the root endosphere were not affected by the inoculants but their presence was indicated. Interestingly and previously unobserved, apple plants responded to the inoculants with increased phytoalexin content in roots, more pronounced in grass than ARD soil. Altogether, our results indicate that FZB42 and RU47 were rhizosphere competent, modulated the root-associated microbiome, and were perceived by the apple plants, which could make them interesting candidates for an eco-friendly mitigation strategy of ARD. KEY POINTS: • Rhizosphere competent inoculants modulated the microbiome (mainly fungi) • Inoculants reduced relative abundance of Enterobacteriaceae in the ARD rhizoplane • Inoculants increased phytoalexin content in roots, stronger in grass than ARD soil.
Topics: Malus; Plant Roots; Rhizosphere; Phytoalexins; Microbiota; Soil Microbiology; Bacillus; RNA, Ribosomal, 16S; Sesquiterpenes; Pseudomonas; Agricultural Inoculants; Fungi; Plant Diseases
PubMed: 38801472
DOI: 10.1007/s00253-024-13181-8 -
Microbial Ecology May 2024Modern crop production relies on the application of chemical pesticides and fertilizers causing environmental and economic challenges. In response, less environmentally...
Modern crop production relies on the application of chemical pesticides and fertilizers causing environmental and economic challenges. In response, less environmentally impactful alternatives have emerged such as the use of beneficial microorganisms. These microorganisms, particularly plant growth-promoting bacteria (PGPB), have demonstrated their ability to enhance plant growth, protect against various stresses, and reduce the need for chemical inputs. Among the PGPB, Bacillus species have garnered attention due to their adaptability and commercial potential. Recent reports have highlighted Bacillus strains as biocontrol agents against phytopathogenic bacteria while concurrently promoting plant growth. We also examined Bacillus plant growth-promoting abilities in Arabidopsis thaliana seedlings. In this study, we assessed the potential of various Bacillus strains to control diverse phytopathogenic bacteria and inhibit quorum sensing using Chromobacterium violaceum as a model system. In conclusion, our results suggest that bacteria of the genus Bacillus hold significant potential for biotechnological applications. This includes developments aimed at reducing agrochemical use, promoting sustainable agriculture, and enhancing crop yield and protection.
Topics: Bacillus; Arabidopsis; Plant Diseases; Quorum Sensing; Chromobacterium; Biological Control Agents; Plant Development; Seedlings; Soil Microbiology
PubMed: 38801423
DOI: 10.1007/s00248-024-02384-1