BACKGROUNDS:Disruption of immune barrier function is considered a hallmark feature of inflammatory bowel disease. In the present study, the potential effects of the methyltransferase inhibitor procaine hydrochloride on intestinal barrier integrity, as well as T cell differentiation in the context of inflammatory bowel disease were explored. METHODS:Using an experimental model of dextran sulfate sodium-induced ulcerative colitis, mice received daily treatment with either sulfasalazine (100 mg/kg) or procaine hydrochloride (45 mg/kg), or saline (10 μL/g) as a negative control, for 7 consecutive days. Subsequent analysis included disease activity index score, histopathology, expression levels of intestinal epithelial tight junctions and apoptotic protein, production of inflammatory cytokines, frequencies of lymphocyte populations in the spleen by flow cytometry and methylation levels of Forkhead box protein 3 (FOXP3). RESULTS:Procaine alleviated dextran sulfate sodium-induced colitis, with a reduced disease activity index (p < 0.05) and histopathological score (p < 0.001). Procaine treatment resulted in a 1.96-fold increase in splenic FOXP3+ CD25+ Tregs (p < 0.001). Administration of procaine significantly enhanced tight junction expression (p < 0.01), decreased the expression of BAX and cleaved caspase-3 protein expression, while increasing that of the anti-apoptotic protein BCL-2. Procaine also significantly suppressed IL-6/signal transducer and activator of transcription factor 3 (STAT3) signaling pathway. In addition, procaine amplified FOXP3+ Tregs by inhibiting FOXP3 methylation. CONCLUSIONS:The protective potential of procaine hydrochloride against intestinal barrier injury in colitis may be attributed to increased abundance of Tregs and the augmentation of their anti-inflammatory properties. The potential mechanisms may involve modulation of IL-6/STAT3 signaling pathway and inhibition of FOXP3 methylation.
BACKGROUNDS:Lymph node metastasis is a critical determinant of breast cancer prognosis, yet the specific microenvironmental cytokines driving this process remain elusive. This study aims to identify key prognostic cytokines linking nodal metastasis to tumor microenvironment (TME) remodeling and to evaluate their clinical utility. METHODS:A predefined panel of 176 microenvironmental genes was evaluated using differential expression analysis and the Least Absolute Shrinkage and Selection Operator (LASSO) algorithm on the TCGA-BRCA cohort to identify optimal predictors of nodal metastasis. Prognostic value was assessed via Kaplan-Meier, subgroup, and multivariate Cox regression analyses, and validated across five independent GEO datasets. Immune infiltration and therapeutic potential were evaluated using Gene Set Enrichment Analysis (GSEA), CIBERSORT deconvolution, pharmacogenomic screening, and molecular docking simulations. RESULTS:Vascular Endothelial Growth Factor C (VEGFC) emerged as the top biomarker significantly upregulated in node-positive tumors. Multivariate analysis confirmed that VEGFC acts as a robust, independent predictor of poor relapse-free survival (RFS). Notably, subgroup analyses revealed this prognostic penalty is exceptionally pronounced in hormone receptor-positive Luminal A and B subtypes. Mechanistically, elevated VEGFC is strongly associated with an immunosuppressive "cold" TME, characterized by reduced cytotoxic CD8+ T-cell infiltration and enriched M2-macrophage polarization across multiple algorithms. Furthermore, pharmacogenomic analyses and docking simulations indicated potential sensitivity to PI3K/AKT inhibitors in VEGFC-high tumors. CONCLUSIONS:VEGFC is a robust, independent precision biomarker specifically indicating poor prognosis in Luminal breast cancers. It is significantly associated with an immune-excluded TME, suggesting that targeting the VEGFC axis may offer a novel strategy to reverse immune evasion.
