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MOSTLY MICROBES AND INFECTIOUS DISEASES
Welcome to Mostly Microbes and Infectious Diseases. David Ojcius posts newspaper and journal articles in the broad field of microbiology.

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Mangrove cyanobacterial diversity as a source of bioactive natural products
Highlights First global review linking polyphasic taxonomy to cyanobacterial metabolites in mangroves Catalogs cyanobacterial strains recognized only by modern morphological and molecular data Reveals high cyanobacterial diversity across mangrove ecosystem, including novel taxa Highlights diverse bioactivities: antimicrobial, anticancer, toxins, bioplastic Bridges taxonomy with biotech applications in drugs, agrochemicals, dyes, biofuels Abstract Extensive exploration of less
David Ojcius
26 minutes ago1 min read


Pregnenolone promotes immune evasion through blocking endogenous retrovirus expression
Highlights Sexual abstinence activates the hypothalamic-pituitary-adrenal (HPA) axis Sexual abstinence promotes tumor progression by inducing pregnenolone production Pregnenolone facilitates the formation of H3K9me3 to suppress ERV replication Pregnenolone antagonist is a highly promising candidate for anti-tumor therapy Summary Research into steroid hormones shaping tumor biology has gained increasing attention. Using multiple mouse tumor models, we show that pregnenolone pr
David Ojcius
1 day ago1 min read


The gut microbiota shapes the human and murine breath volatilome
Highlights The gut metagenome is correlated with a host’s exhaled breath volatilome We devise a method to capture mouse breath using a murine ventilator Gnotobiotic mouse models help identify microbial contributions to exhaled breath The breath volatilome can signal the presence of the asthma-associated species E. sireaum Summary The gut microbiota is crucial to health, yet implementation of microbiota-based therapeutics is limited by the lack of rapid diagnostics. We hypoth
David Ojcius
3 days ago1 min read


Loss of cPLA2α function attenuates inflammation and epithelial thickening in a mouse model of Haemophilus influenzae-mediated COPD exacerbation
Highlights Development of mouse model that closely mimics Haemophilus influenzae-mediated COPD exacerbation. Gene targeting approach reveals that cytosolic phospholipase 2-a (cPLA2-a) alters lung inflammatory response using COPD exacerbation experimental model. Also, cPLA2-a contributes to airway epithelium thickening in this clinical manifestation. Novel mechanism of bacterial infection-mediated COPD exacerbation involving cPLA2a. ABSTRACT Among the characteristics of chroni
David Ojcius
4 days ago1 min read


History of dental treatments
The history of dental treatments dates back to thousands of years. The scope of this article is limited to the pre-1981 history . The earliest known example of dental caries manipulation is found in a Paleolithic man, dated between 14,160 and 13,820 BP . The earliest known use of a filling after removal of decayed or infected pulp is found in a Paleolithic who lived near modern-day Tuscany , Italy, from 13,000 to 12,740 BP. Although inconclusive, researchers have
David Ojcius
4 days ago1 min read


Discovery of BPR2-D2 compound in inhibiting Chikungunya viral RNA synthesis by replicon systems
Highlights BPR2-D2, a coumarin derivative, is able to inhibit Chikungunya virus (CHIKV) RNA replication with a high selective index. BPR2-D2 can inhibit replication of Sindbis virus, which is an arthritogenic alphavirus as CHIKV The CHIKV replicon systems, which can be surrogates for studying CHIKV RNA replication, are applicable and convenient for antiviral screening. ABSTRACT Chikungunya virus (CHIKV), an alphavirus in the Togaviridae family, is transmitted to humans thro
David Ojcius
5 days ago1 min read


Omics-Based Dissection of Alternative Splicing and the Regulatory Architecture in Fungal Genomes
Highlights Alternative splicing has been implicated in the regulation of a variety of genes Intron retention is the most frequent alternative splicing event in fungi We critically identified the gaps in the role of alternative splicing in fungi We proposed a practical roadmap to fill these gaps. ABSTRACT Assigning mechanistic and functional associations to most of the widespread splicing diversity in fungi has been one of the continuous and most intriguing challenges in the f
David Ojcius
6 days ago2 min read


Boswellia serrata Extract and Its Bioactive Compound, 3-O-Acetyl-11-Keto-β-Boswellic Acid (AKBA), Induce ROS-Mediated Intracellular Clearance of Porphyromonas gingivalis in Gingival Epithelial Cells
Porphyromonas gingivalis is a keystone pathogen in periodontitis, known for its ability to invade gingival epithelial cells and persist intracellularly. Conventional antimicrobials are often ineffective against intracellular pathogens, and natural products remain poorly explored in this context. Here, we investigated the antimicrobial effects of Boswellia serrata extract and its bioactive compounds on the dynamics of P. gingivalis infection in human gingival epithelial
David Ojcius
Jan 191 min read


Cellular senescence as a therapeutic target for aging intervention
Highlights Senescent cells drive aging, chronic disease, and tissue dysfunction Senotherapeutics span senolytics, senomorphics, immunotherapy, and restoration Target selection, screening readouts, and delivery platforms are linked to senescent-state biology to improve selectivity and translation Abstract Cellular senescence is a stress-induced cellular state that contributes to tissue dysfunction, chronic inflammation, and a broad range of aging-associated pathologies. The ac
David Ojcius
Jan 181 min read


Mitochondrial transfer from immune to tumor cells enables lymph node metastasis
Highlights Cancer cells hijack mitochondria from many immune cells Mitochondria loss by immune cells impairs innate and adaptive anti-tumor immunity Fusion of hijacked and endogenous cancer cell mitochondria triggers cGAS STING activation cGAS-STING activation promotes lymph node metastasis through type I interferon signaling Summary Although the immune system is a significant barrier to tumor growth and spread, established tumors evade immune attack and frequently colonize i
David Ojcius
Jan 181 min read


TseVF-TsiVF, a novel bacteriolytic effector-immunity pair of Vibrio fluvialis VflT6SS2, provides a fitness advantage in microbial competition
Highlight T6SS effector TseVF demonstrates apparent bacterial killing activity in the periplasm. TseVF interacts with phosphate lipid molecules and compromises the integrity of the cell membrane. The C-terminal region of TseVF is responsible for its bactericidal activity. 4. TsiVF binds to and neutralizes TseVF toxicity. TseVF secretion and bactericidality requires the C terminus of a cognate VgrG protein (TssI2_b). Abstract Vibrio fluvialis ( V. fluvialis ) is a halophilic
David Ojcius
Jan 172 min read


Diversity and Transmission Processes of Potentially Pathogenic Bacterial Communities in the East Rongbuk Glaciers, Mt. Everest
Highlights A total of 833 glacier-derived potential pathogens were identified across habitats. Altitude and TOC drive distinct patterns of pathogen diversity in glacier habitats. Moraine and cryoconite are key sources of downstream pathogen dispersal. Community assembly is mainly stochastic, with network structure shaping selection. Cryospheric biosafety risks emerge via airborne and meltwater transmission pathways. Abstract Glacier retreat driven by global warming is releasi
David Ojcius
Jan 172 min read


Parabacteroides
Parabacteroides is a Gram-negative , anaerobic , non- spore -forming genus from the family Tannerellaceae . First isolated from fecal specimen in 1933, type strain Parabacteroides distasonis was originally classified under the name Bacteroides distasonis. The strain was re-classified to form the new genus Parabacteroides in 2006. Parabacteroides currently comprise 21 phylogenetically, ecologically, and metabolically diverse species, 11 of which are listed in the t
David Ojcius
Jan 121 min read


Biocontrol efficiency of native Bacillus sp. HC-9 on honeysuckle leaf spot caused by Alternaria alternata
Highlights Bacillus sp. HC-9 controls honeysuckle leaf spot caused by A. alternata. Strain HC-9 inhibits eight phytopathogenic fungi with strong antifungal activity. Strain HC-9 induces ROS and activates defense enzymes in honeysuckle leaves. Field trials show HC-9 achieves up to 80.52% disease control efficiency. Abstract Honeysuckle leaf spot disease, caused by Alternaria alternata , severely affects the yield and quality of honeysuckle crops. Biological control using nati
David Ojcius
Jan 92 min read


The TamA protein as a subunit vaccine improves immune protection against highly virulent Klebsiella pneumoniae infection in mice
Highlights Identification of the TamA protein as a highly conserved antigen across diverse Klebsiella pneumoniae strains, making it an ideal target for a broad-spectrum subunit vaccine. Development and evaluation of a recombinant TamA protein vaccine that significantly enhances immune protection against a highly virulent Klebsiella pneumoniae infection in a murine model. Demonstration of TamA-induced specific antibodies that effectively inhibit bacterial adherence to epithe
David Ojcius
Jan 92 min read


Chlamydiose
Chlamydiosen sind durch verschiedene Chlamydien (bestimmte Bakterienarten ) verursachte Infektionskrankheiten . Sie betreffen das Auge (als Trachom ), die Atemwege und die Lunge (als Pneumonie ) und den Urogenitaltrakt (Harn- und Geschlechtsorgane) als sexuell übertragene Krankheit . Von genitalen Chlamydien-Infektionen sind überwiegend Jugendliche und junge Erwachsene im Alter von 15 bis 24 Jahren betroffen. Urogenitale Chlamydien-Infektionen verlaufen häuf
David Ojcius
Jan 81 min read


Phospholipid Diversity and Biosynthesis Pathway in Bacteria: Potential Antibacterial Targets
Highlights Phospholipid diversity shapes membrane properties for growth and stress adaptation Bacteria remodel phospholipid head groups and acyl chains to resist antimicrobials Phospholipid and its metabolism serve as promising potential antibacterial targets Abstract Bacterial infections have posed a serious threat globally. The discovery of new targets and the development of novel antimicrobial agents are urgently needed to combat these bacterial infections. The bacterial m
David Ojcius
Jan 61 min read


Isolation, Identification, and Plant Growth-Promoting Mechanisms of Strain BN5, with a Focus on Exogenously Trp-Independent IAA Biosynthesis, and Its Impact on Cucumber Cultivation
Highlights First systematic report of Niallia taxi BN5 with plant growth-promoting (PGP) activity, filling the Niallia PGP mechanism gap (previously studied for bioremediation/antibacterial functions). Multi-omics (genome/transcriptome/qPCR) show BN5 has a complete trp operon for constitutive IAA biosynthesis (17.64 μg/mL); tryptophan regulates trp/motility genes. BN5 enhances cucumber growth (height +24.29%, stem +11.23%), yield (+17.55%) and quality (vitamin C +17.2%, sol
David Ojcius
Jan 62 min read


Vaccines Are Helping Older People More Than We Knew
Many shots seem to have “off-target” benefits, such as lowering the risk of dementia, studies have found. Let’s be clear. The primary reason to be vaccinated against shingles is that two shots provide 90 percent protection against a painful, blistering disease that a third of Americans will suffer in their lifetimes, one that can cause lingering nerve pain and other nasty long-term consequences. The most important reason for older adults to be vaccinated against the respirat
David Ojcius
Jan 61 min read


Differences in Gut Microbiota Composition Are an Important Reason for Lower Serum P-Cresol Sulfate Levels in anuric Peritoneal Dialysis Patients Compared to Hemodialysis Patients
Highlights Distinct microbial communities are found in peritoneal dialysis (PD) and paired hemodialysis (HD) patients, despite similar microbiome diversity. Serum p-cresyl sulfate (PCS) levels are significantly lower in PD patients compared to paired HD patients. Altered microbial composition in PD patients, featuring more opportunistic pathogens and fewer beneficial bacteria, is linked to differences in metabolite profiles. Fecal transplant experiments confirm that the HD-as
David Ojcius
Jan 52 min read
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