Apmis最新文献

Undifferentiated round cell sarcomas (URCSs) are aggressive neoplasms with overlapping histology but distinct molecular profiles. Accurate subclassification is crucial for prognosis and therapy, particularly in tumors lacking classic Ewing sarcoma alterations. In this retrospective study, 59 URCSs were re-evaluated morphologically, immunohistochemically, and molecularly. Fifty-three were classified as Ewing sarcoma, and six as non-Ewing sarcoma: three BCOR::CCNB3, two CIC::DUX4, and one ZC3H7B::BCOR. Ewing sarcomas showed uniform round cells with thin fibrovascular stroma. BCOR-altered sarcomas often contained spindle cells and myxoid stroma, whereas CIC::DUX4 tumors displayed epithelioid cells with eosinophilic cytoplasm, nucleoli, and myxoid stroma. Stromal features and cellular morphology differed significantly between Ewing and non-Ewing groups. Immunohistochemically, Ewing sarcomas had higher NKX2.2 and CD99 expression while BCOR-altered tumors showed strong nuclear BCOR positivity. WT1 staining revealed distinct paranuclear positivity in both CIC::DUX4 cases. Our unique ZC3H7B::BCOR case involved a young adult with spindle cell morphology, myxoid stroma, and negative BCOR staining, underscoring diagnostic challenges and contributing novel clinicopathologic data on this exceedingly rare subtype. These findings highlight key morphologic and immunophenotypic clues to differentiate URCS subgroups and reinforce the importance of integrated histopathological and molecular evaluation to achieve accurate diagnosis and subclassification.

Biofilms pose a significant threat to public health due to their role in antibiotic-resistant infections, including urinary tract infections, cystic fibrosis, and infective endocarditis. Enterobacter hormaechei, a Gram-negative bacterium within the Enterobacter cloacae complex (ECC), is a known biofilm-former that contributes to infections in the urinary tract, soft tissues, and medical devices. This study investigates the antibiofilm activity of naringin (NA), a flavonoid derived from naringenin, against E. hormaechei using various assays. Minimum Inhibitory Concentration (MIC) assay revealed that NA inhibits planktonic bacterial growth, with an MIC value of 4.096 mg/mL. Crystal Violet (CV) assay revealed a significant reduction in biofilm formation at NA concentrations of 0.5 mg/mL, 1 mg/mL, and 1.5 mg/mL compared to controls. Fluorescence microscopy further confirmed a decrease in bacterial population and disruption of biofilm architecture following NA treatment. In silico analysis was conducted to investigate the potential molecular interactions of NA with the biofilm regulatory proteins MrkB and FimA. The results indicated that NA might effectively inhibit biofilm formation in E. hormaechei by targeting these two key proteins involved in pilus biogenesis and bacterial adherence. These findings suggest that NA could serve as a potential therapeutic agent against E. hormaechei-associated infections.

Several highly antibiotic-resistant infections are caused by methicillin-resistant Staphylococcus aureus (MRSA) due to its ability to form biofilms. Antibiofilm strategies cannot be developed without the use of comprehensive microscopic techniques. This study aimed to examine the antibiofilm activity of linoleic acid, ferulic acid, vanillic acid, and iso-vanillic acid against the MRSA and its biofilm. The microdilution method was used to study the antibacterial activity of selected natural products against MRSA in vitro. SEM was used to examine the effect of selected natural products on the degradation of extracellular polymeric substances of MRSA biofilms. Metabolic activity was monitored using the tetrazolium (MTT) assay. SEM images revealed that sub-inhibitory concentrations of linoleic acid, vanillic acid, ferulic acid, and isovanillic acid significantly prevented MRSA cell adhesion, and altered bacterial morphology. Whereas, treatment of mature biofilms with higher concentrations of vanillic acid, linoleic acid, ferulic acid, and isovanillic acid resulted in significant destruction of biofilms and their extracellular polymeric substances. Linoleic acid, ferulic acid, vanillic acid, and iso-vanillic acid, therefore, could help in the prevention of MRSA biofilm formation, and the removal of preformed biofilms, which will lead to the development of combinatorial strategies against biofilm-related MRSA infections.

Dental caries arises from dysbiosis of the oral microbiome, wherein acidogenic pathogens such as Streptococcus mutans dominate over protective commensals. Sodium fluoride (NaF) remains a cornerstone in caries prevention; however, its limited efficacy in high-risk individuals and the emergence of fluoride-resistant strains highlight the need for enhanced therapeutic strategies. The present study investigates the synergistic antibacterial potential of NaF combined with ricinoleic acid (RA), a bioactive fatty acid with established antimicrobial activity. Checkerboard and time-kill assays revealed a strong synergistic interaction between RA and NaF, with a combinatorial minimum inhibitory concentration (CMIC) of 64 + 128 μg/mL, respectively. Complete eradication of S. mutans was achieved within 120 min at CMIC (64 + 128 μg/mL). The combination significantly disrupted mature biofilms, resulting in an 82% reduction in total biomass as confirmed by confocal microscopy. Mechanistic analyses indicated that RA triggered reactive oxygen species (ROS) generation and membrane perturbation, which facilitated enhanced NaF uptake and intracellular antibacterial action. Moreover, the RA-NaF combination markedly inhibited key virulence attributes of S. mutans, including acidogenesis and aciduricity, by approximately 76% and 71%, respectively. The treatment also exhibited a sustained post-antimicrobial effect lasting up to 12 h and did not induce bacterial resistance upon repeated exposure. Collectively, these findings highlight that RA potentiates the anticariogenic efficacy of NaF through a multi-targeted cellular mechanism involving oxidative stress induction, membrane disruption, and metabolic suppression. This synergistic combination represents a promising and fluoride-efficient strategy for the prevention and management of dental caries.

To investigate, through immunohistochemistry, the interaction between the epithelial-mesenchymal transition (EMT) status and the tumor microenvironment (TME) in oral tongue squamous cell carcinomas (OTSCCs). A total of 61 cases of OTSCC were selected. In all cases, the EMT status was determined through the analysis of E-cadherin and N-cadherin immunoexpression, while the TME was characterized using TGF-β and α-SMA for cancer-associated fibroblasts, CD163 for M2 macrophages, and Foxp3 for regulatory T cells. Associations between the expression patterns of these proteins and clinicopathological features, as well as overall survival (OS) and disease-free survival (DFS) parameters, were investigated. High α-SMA expression in OTSCC cases was significantly associated with a positive EMT status (p = 0.011). This marker also showed a significant positive correlation with TGF-β immunostaining (p = 0.028). Foxp3 and CD163 also demonstrated a significant positive correlation (p = 0.010). Multivariate analysis identified high Foxp3 (p = 0.011) and TGF-β (p = 0.002) expression as independent prognostic factors for OS, and high TGF-β expression (p = 0.031) as an independent prognostic factor for DFS. The results suggest an interaction among TME biomarkers, with implications for EMT development and progression, as well as for the prognosis of OTSCC.

Biofilms are microbial communities enclosed in an extracellular polymeric substance (EPS), significantly contributing to antimicrobial resistance (AMR) in medical, industrial, and environmental settings. Their matrix enhances microbial survival, inhibits antibiotic penetration, and facilitates horizontal gene transfer, worsening the AMR crisis. Conventional antimicrobial treatments often fail against biofilms, necessitating novel therapeutic strategies. Emerging biofilm-targeted interventions, such as nanotechnology-based antimicrobials, bacteriophage therapy, and CRISPR-Cas9 gene editing, offer promising solutions. Nanoparticles improve drug delivery, bacteriophages selectively lyse resistant bacterial populations, and CRISPR-Cas9 disrupts AMR-related genes and biofilm virulence factors. Additionally, AI and ML are advancing biofilm prediction models and antimicrobial optimization, paving the way for precision-targeted interventions. This review explores biofilm biology and next-generation biofilm control strategies, with a focus on AI-driven bioinformatics. Future research should focus on clinical translation, regulatory standardization, and scalable implementation in healthcare and industrial settings to combat biofilm-associated AMR.