Search Results (911)

Tumor microenvironment influences the process of tumorigenesis, with hypoxia being a characteristic of many solid tumors and an adverse prognostic factor. Carbonic anhydrases (CAs) are highly efficient zinc-containing enzymes that are overexpressed in many cancers, particularly under acidic and hypoxic conditions. CA IX expression promotes cancer cell proliferation, migration, and invasion. Vascular endothelial growth factor receptor-2 (VEGFR-2) is a tyrosine transmembrane (ΤΜ) protein regulating embryonic development, angiogenesis, tissue homeostasis and cancer. Blocking VEGFR-2 signaling is one of the most promising approaches to hindering angiogenesis and growth of cancer cells. The epidermal growth factor receptor (EGFR) is a member of the ERBB family of receptor tyrosine kinases and plays a key role in cancer progression. EGFR is uniquely found in some brain, lung and other cancers. Development of novel strategies to regulate these factors is important for the treatment of tumors. Multifunctional drugs that act on multiple pathways offer a promising approach, improving therapeutic effectiveness while reducing side effects. The present review focuses on novel compounds that inhibit CA IX and target VEGFR-2 or EGFR. Full article

Endothelial VEGFR-2 plays a central role in vascular remodeling during intestinal inflammation, yet its activation during the early stages of colitis remains poorly characterized. Because Akt is a major downstream effector of VEGFR-2 signaling and a key mediator of endothelial responses, we investigated whether VEGFR-2 phosphorylation and Akt activation occur during the early phase of TNBS-induced colitis before the development of extensive mucosal injury. Acute colitis was induced in adult female Wistar rats by intracolonic administration of TNBS. Colonic tissues were collected on days 2, 4, and 6 after induction. Histological analyses and macrophage (CD68⁺ cells) infiltration were performed to characterize disease progression. VEGFR-2 expression and phosphorylation at Tyr1175 were evaluated on day 4 by Western blot, immunoprecipitation, and immunofluorescence. Akt activation was also assessed. TNBS-induced colitis is characterized by histological injury and increased CD68⁺ macrophage infiltration on day 4, with severe tissue damage observed on day 6. On day 4, colitis is associated with increased endothelial VEGFR-2 expression, enhanced VEGFR-2 phosphorylation at Tyr1175, and Akt activation. Early TNBS-induced colitis is associated with endothelial VEGFR-2 phosphorylation and Akt activation before the onset of extensive mucosal destruction on day 6. These findings support activation of the VEGFR-2/Akt signaling axis as an early vascular response during intestinal inflammation and suggest its potential contribution to disease progression. Full article

Background: Hemorrhagic wounds pose significant clinical challenges, with approximately 20% associated with surgical site infections and an increased mortality risk. Despite growing interest in natural product-based medicines, the molecular targets and bioactive phytochemicals of Musa acuminata peel relevant to hemorrhagic wound healing are insufficiently established. Methods: This study employed an integrative in silico approach to identify bioactive phytochemicals from the ethyl acetate extract of Musa acuminata peel as potential wound healing agents. Liquid chromatography-high resolution mass spectrometry (LC-HRMS) profiling was performed for phytochemical characterization, followed by drug-likeness and toxicity screening via OSIRIS DataWarrior. Network pharmacology, molecular docking, molecular dynamics (MD), binding free energy calculation, pharmacokinetic properties prediction, and density functional theory (DFT) analysis were subsequently conducted. Results: LC–HRMS profiling identified 211 compounds across 21 chemical classes, of which 18 met drug-likeness criteria. Network pharmacology revealed five key protein targets. Molecular docking demonstrated that Compound 16 (−9.34 kcal/mol) and Compound 17 (−9.26 kcal/mol) exhibited stronger binding affinity toward VEGFR2 than Axitinib (−9.15 kcal/mol), with key interactions at glutamic acid-917 (GLU917) and cysteine-919 (CYS919). MD simulations over 100 ns confirmed complex stability, with BP16 showing superior binding stability and favorable MM/PBSA free energy. Pharmacokinetics and DFT analysis further supported BP16 as the most promising lead compound, exhibiting favorable pharmacokinetic properties, low predicted toxicity, and enhanced electronic stability. Conclusions: BP16 and BP17 are identified as potential VEGFR2-targeting candidates, providing a rational mechanistic foundation for future experimental validation as natural hemorrhagic wound healing therapeutics. Full article

Background and Objectives: Blood group antigens are well known for their importance in transfusion medicine and transplant compatibility; however, their biological role extends beyond these functions and includes associations with the risk of several diseases. In this study, we investigated the relationship between ABO blood groups and the circulating levels of 73 different molecules. Patients and Methods: Fifty-six healthy donors were enrolled, including 24 individuals with blood group O, 19 with blood group A, and 13 with blood group B. Blood samples were collected and analyzed in a single laboratory using Luminex fluorescent bead-based assay panels to determine the concentrations of 73 circulating molecules. Depending on data distribution, ANOVA or Kruskal–Wallis tests and Student’s t-test or Kolmogorov–Smirnov tests were applied to identify significant differences among groups. Associations were further assessed by binary logistic regression analysis. Results: Subjects with blood group A showed significantly higher circulating levels of IL-1R1, IL-13, IL-23, PDGF-BB, VEGF-A, VEGF-D, soluble VEGF-R2 (KDR), soluble VEGF-R3 (FLT-4), VLA-4, CD141, MMP-1, syndecan-1 (SDC-1), and mannose-binding lectin (MBL) compared with the other blood groups. In contrast, individuals with blood group B exhibited significantly higher levels of IL-22, IL-23, PDGF-BB, CD62P (P-selectin), and amyloid β1–42. Several significant associations were identified by logistic regression analysis. Conclusions: Our findings indicate that ABO blood groups are associated with distinct circulating molecular profiles, supporting the existence of biological differences that may contribute to variations in disease susceptibility among individuals with different blood types. Nevertheless, given the exploratory’s nature and limited sample size of this study, further investigations are required to validate these findings, confirm the observed associations, and clarify their potential clinical implications. Full article

This study evaluated the structural, electronic, pharmacokinetic, and receptor-binding properties of three bisphosphonate derivatives, alendronate, risedronate, and zoledronate, to investigate their therapeutic relevance in osteoporosis and breast cancer. Density Functional Theory (DFT) calculations at the B3LYP/6-31G(d,p) level showed that risedronate exhibited the highest kinetic stability (ΔE = 6.7468 eV), whereas zoledronate displayed greater chemical reactivity (ΔE = 2.9669 eV) and the strongest nonlinear optical response (β = 1.20 × 10⁻³⁰ esu). ADMET analysis indicated acceptable safety profiles for all compounds, although high polarity and low lipophilicity may limit oral bioavailability. Molecular docking against 11 breast cancer- and bone metabolism-related targets revealed favorable binding affinities, particularly for zoledronate and risedronate. Zoledronate showed strong interactions with ESR2, VEGFR/KDR, GGPS1, and FPPS, whereas risedronate exhibited notable affinity for BRCA2 and MMP9. Bioinformatics analyses identified significant dysregulation of GGPS1, FDPS, TNFSF11, ESR1, MMP9, and BRCA2 in breast cancer tissues, while survival analysis linked elevated FDPS, MMP9, and BRCA2 expression to poor prognosis. Network analyses highlighted pathways related to mevalonate metabolism, hormone signaling, angiogenesis, extracellular matrix remodeling, and the RANK/RANKL/OPG axis. These findings support the potential repurposing of bisphosphonates, particularly zoledronate, for breast cancer-associated bone disease. Full article

Head and neck squamous cell carcinoma (HNSCC) remains one of the most aggressive and heterogeneous malignancies worldwide, characterized by high rates of locoregional recurrence, metastatic dissemination, and therapeutic resistance. Angiogenesis plays a central role in tumor progression by supporting vascular remodeling, hypoxia adaptation, invasion, immune evasion, and metastatic spread. In HNSCC, angiogenic activation is regulated through complex interactions involving hypoxia-inducible factors, vascular endothelial growth factor (VEGF) signaling, stromal remodeling, inflammatory pathways, and epigenetic mechanisms within the tumor microenvironment. Recent evidence has also highlighted the role of non-coding RNAs, particularly microRNAs, and exosome-mediated communication in modulating angiogenic and immune-related signaling pathways. Although antiangiogenic therapies, including monoclonal antibodies and tyrosine kinase inhibitors, have demonstrated biological activity in HNSCC, their clinical efficacy remains limited by tumor heterogeneity, adaptive resistance mechanisms, toxicity, and the lack of validated predictive biomarkers. Several emerging therapeutic strategies are under preclinical or early clinical investigation in HNSCC, including miRNA-based approaches, nanoparticle-assisted delivery systems, vascular normalization concepts, and combinations with immune checkpoint inhibitors; however, robust clinical evidence for most of these strategies remains limited, and their translation to routine practice requires further validation. This review provides a comprehensive overview of the molecular mechanisms regulating angiogenesis in HNSCC and critically discusses current and emerging pharmacological strategies targeting these pathways. Particular emphasis is placed on VEGF/VEGFR signaling, the integration of miRNA and exosome biology, resistance mechanisms, and translational perspectives for biomarker-guided personalized therapy. The novelty of this review lies in the systematic integration of miRNA- and exosome-mediated angiogenic regulation, therapeutic resistance pathways, and precision medicine strategies into a unified pharmacological framework, addressing gaps not fully covered by prior reviews focused primarily on VEGF-targeted agents. Full article

Multidrug resistance (MDR) is defined as resistance to apparently unrelated drugs with different mechanisms of action, a phenomenon that seriously decreases the efficacy of many anticancer therapeutic regimens. MDR is mainly associated with a high expression of ATP-binding cassette (ABC) transporters, including ABCB1, ABCG2, and members of the ABCC subfamily, which actively extrude many anticancer drugs of various classes out of the cells. Protein kinase inhibitors (PKIs) were developed as therapies targeting oncogenic kinases but later appeared to be both substrates and inhibitors of ABC transporters and thus can potentially reverse MDR. This comprehensive review evaluates how PKIs regulate ABC transporters through three key mechanisms: altering expression, modifying subcellular localization, and inhibiting the efflux function. We evaluated the effect of PKIs that target tyrosine and serine/threonine kinases, such as EGFR/ErbB, JAK, VEGFR, BCR-Abl, ALK, FGFR, MEK1/2, B-RAF, BTK, CDK4/6, MET, RET, PDGFR and SYK. We have collected both computational studies and experimental reports, including functional assays, mechanistic studies of inhibition, and structural approaches that have evaluated PKIs’ effects on ABC transporters. We conclude that although PKIs can be ABC substrates, they mainly inhibit drug efflux, with minimal and context-dependent effects on transporter expression or localization. Full article

There are a few molecules that are regularly used as markers for lymphatic endothelial cells (LECs) such as the adhesion molecule CD31/PEACAM1, the transcription factor PROX1, the Vascular Endothelial Growth Factor Receptor-3 (VEGFR3/FLT4), the glycoprotein podoplanin, and the hyaluronan receptor LYVE1. However, none of the molecules are exclusively expressed in LECs, and there is molecular and functional heterogeneity of LECs in initial lymphatics, lymphatic collectors and lymph nodes. Therefore, a combination of markers must be applied to identify lymphatics. This is particularly true for the characterization of conditions such as lymphatic malformations or cancers, in which the molecular profile of vessels may be variable or abnormal. Here we present two molecules that can help distinguish between endothelial cells of blood and lymphatic vessels: the scaffold protein liprin β-1 (PPFIBP1) and the intermediate filament synemin. We collected own data on the RNA and protein expression of the two molecules in humans, and studied publicly available databases. PPFIBP1 appears to be a suitable marker of LECs in initial lymphatics, collectors and lymph nodes, while synemin appears to be more restricted to initial lymphatics. We hope this will stimulate monoclonal antibody development and help expand the range of LEC markers in health and disease. Full article

Research on diabetic retinopathy (DR) usually emphasizes hyperglycemia and other causes like dyslipidemia, which are still not well understood. This study examined the effects of palmitic acid (PA) exposure, alone and combined with high glucose (G25), on Müller Glial Cell (MGC) dysfunction and angiogenic signaling. Primary MGC cultures were treated with G25 (25 mM), PA (250 µM), or PA + G25 for 24 and 48 h, followed by assessments of cell viability and analysis of the Vascular Endothelial Growth Factor (VEGFA)/VEGFA receptor 2 (VEGFR2) pathway through immunofluorescence, Western blot, and ELISA. Additionally, Gaussian mixture models (GMMs) were used to identify phenotypic subpopulations based on fluorescence intensity. The results showed that while hyperglycemia did not cause significant changes, PA and PA + G25 induced apoptosis-related cell death and significantly increased the expression of VEGFA, VEGFR2, HIF-α, and SP1. Although broad phenotypic diversity was observed at 24 h, by 48 h, a distinct shift towards an angiogenic phenotype was noted, with significantly elevated VEGFA/VEGFR2 levels. In summary, this research demonstrates that PA acts as a critical inducer of an angiogenic secretory phenotype in MGCs, indicating that lipid-mediated signaling plays a vital role in neovascularization in DR, possibly independent of glucose levels. Full article

Background/Objectives: Recurrent or metastatic adenoid cystic carcinoma (R/M ACC) has no standard systemic therapy. VEGFR-targeting tyrosine kinase inhibitors (TKIs) are commonly used first-line, though no international standard exists; cisplatin-based chemotherapy is an alternative. We retrospectively reviewed the cyclophosphamide–epirubicin–cisplatin (CEP) regimen to determine whether prior TKI exposure compromises subsequent chemotherapy efficacy. Methods: We studied 31 patients given CEP for progressive R/M ACC (2018–2023). Tumor response was assessed by RECIST 1.1. Molecular subtype was determined by c-MYC/p63 immunohistochemistry (ACC-I, c-MYC-positive/p63-negative; ACC-II, p63-positive/c-MYC-low or negative). Multivariable models used Firth’s penalized likelihood Cox regression. Next-generation sequencing (NGS) was available in 21 of 31 patients. Results: Thirty-one patients were enrolled (median age 48; 17 [54.8%] with prior TKI). At median follow-up of 22.6 months, the objective response rate (ORR) was 19.4%, disease control rate 71.0%, median progression-free survival (PFS) 5.3 months, and median overall survival (OS) 10.3 months. Prior TKI did not lower efficacy: ORR 17.6% vs. 21.4%, PFS hazard ratio 0.76 (p = 0.519). All six partial responses occurred in ACC-I tumors (35.3% vs. 0% in ACC-II, p = 0.021). In the NGS subset (5 PIK3CA-mutant), PIK3CA mutation (OS HR 6.19, p = 0.024) and bone metastasis (OS HR 5.84, p = 0.027) remained associated with shorter OS after adjustment. No treatment-related deaths occurred. Conclusions: CEP is active in R/M ACC, and prior TKI exposure did not appear to reduce efficacy. Higher response rates in ACC-I tumors and the apparent PIK3CA-related survival deficit are exploratory observations that need prospective testing before they can guide treatment. Full article

Preclinical studies and data from other cancers suggest that inhibition of the Hedgehog (Hh) pathway also has antiproliferative effects on glioma cells. A key component of this pathway is the Smoothened (SMO) protein, which is expressed in high-grade gliomas. Itraconazole (ITRA), a widely used antifungal agent, inhibits SMO, the PI3K/AKT/mTOR pathway, and the VEGF/VEGFR-2 axis—both of which are critical for GBM progression and angiogenesis. This protocol describes a prospective, single-center, dose-escalation phase I study with the classical 3 + 3 design in order to determine the MTD of ITRA. The study enrolls patients with a newly histologically confirmed diagnosis of GBM, without previous treatment except surgery. They will be treated with standard RT schedule (60 Gy in 30 fractions) with concurrent TMZ 75 mg/m² and ITRA 2 × 100 mg, 200 mg, or 300 mg daily. The primary endpoint is to determine the MTD of ITRA given concurrently with RT + TMZ. Secondary endpoints include safety and tolerability of ITRA, overall survival (OS), progression-free survival (PFS), overall objective response rate, use of corticosteroids, treatment compliance, and health-related quality of life (EORTC QLQ-C30 and BN20). Participants will be monitored for one week post-treatment. All relevant statistics will be primarily descriptive. Full article

Desmoplastic small round cell tumor (DSRCT) is a rare and highly malignant tumor that mostly occurs in young males. Due to its extremely strong invasiveness and poor prognosis, the treatment of DSRCT remains a major challenge in current medical research. The comprehensive treatment strategy based on surgery, combined with chemotherapy, targeted therapy, immunotherapy has become a clinical consensus. This review summarizes the main pathogenic mechanisms of DSRCT, as well as the targets involved in treatment and their applications, including targeted therapy targets (PDGF, VEGFR, FGFR4, IGF1R, HER2, c-KIT, mTOR, AR), immunotherapy targets (PD-1, PD-L1, B7H3, GD2), and treatments related to DNA damage response. Studies have shown that treatments targeting specific targets can inhibit tumor progression and prolong patient survival to a certain extent, but the efficacy has individual differences and is still limited. Therefore, future research still needs to further explore the molecular mechanism of DSRCT and discover more accurate and effective therapeutic targets. Full article

Background: Heart failure (HF) has traditionally been interpreted through hemodynamic, neurohormonal, and cardiorenal frameworks. Although these models explain many aspects of clinical decompensation, they do not fully account for persistent tissue congestion, unresolved myocardial edema, chronic sterile inflammation, and progressive fibrosis despite optimized therapy. Objectives: To review the anatomy, physiology, and pathobiological relevance of the cardiac lymphatic system in HF and to evaluate whether cardiac lymphatic dysfunction constitutes a mechanistic bridge linking congestion, inflammation, and adverse remodeling. Methods: This narrative review was based on a structured literature search of PubMed/MEDLINE, supplemented by manual backward reference screening and bibliographic verification through journal webpages. The search covered January 2000 to 15 April 2026, with emphasis on 2018 onward and on seminal mechanistic studies. Search domains included cardiac lymphatics, heart failure, lymphangiogenesis, myocardial edema, congestion, inflammation, myocardial infarction, pressure overload, and HFpEF. Results: Cardiac lymphatics regulate myocardial clearance of interstitial fluid, proteins, cytokines, lipids, and immune cells. Preclinical experimental evidence, mainly derived from myocardial infarction, pressure-overload, and lymphatic-insufficiency models, indicates that impaired lymphatic transport or insufficient lymphangiogenic adaptation promotes myocardial edema, inflammatory persistence, fibroblast activation, collagen deposition, and ventricular dysfunction. Human observational and early translational studies suggest that lymphatic dysregulation may also be relevant in selected HF phenotypes, although direct clinical evidence remains limited. Conversely, lymphangiogenic and lymphatic-restorative strategies, especially through the VEGF-C/VEGFR-3 axis, reduce edema, enhance inflammatory resolution, attenuate fibrosis, and improve ventricular performance in preclinical models. Conclusions: Cardiac lymphatic dysfunction provides a compelling conceptual framework that links congestion and inflammation in HF. Rather than acting as a passive bystander, the cardiac lymphatic circulation appears to be an active determinant of myocardial homeostasis and disease progression. Recognition of lymphatic insufficiency as a pathogenic component of HF may open new diagnostic and therapeutic avenues, including tissue-focused decongestion, lymphatic phenotyping, and targeted lymphatic repair. Full article

Pharmacophore hybridization is a well-established strategy for developing novel anticancer agents with improved biological profiles. In this study, a new series of (E)-4-(4-acrylamidophenoxy)-N-methylpicolinamide derivatives has been rationally designed by hybridizing key structural features of sorafenib with cinnamide pharmacophores and subsequently synthesized. The antiproliferative activities of the synthesized compounds were evaluated against a panel of human cancer cell lines, including A549 (lung), DU-145 (prostate), SKOV3 (ovarian), and HepG2 (liver), along with non-cancerous Hek293T cells. In comparison with the standard drug sorafenib, most of the (E)-4-(4-acrylamidophenoxy)-N-methylpicolinamides demonstrated significant antiproliferative activity, with specificity toward the HepG2 (liver cancer) cell line, and no effect on the noncancerous cells (Hek293T). Among them, compound 5f, the derivative containing a trifluoromethyl-substituted cinnamoyl moiety was identified as the lead candidate, exhibiting an IC₅₀ of 5.3 µM towards HepG2 (liver) cancer cells, comparable to the reference drug sorafenib. Enzyme inhibition studies showed that compound 5f inhibited both b-Raf and VEGFR-2 with IC₅₀ values of 1.45 and 0.37 µM, respectively. Furthermore, compound 5f suppressed angiogenesis in vitro and in vivo, as evidenced by the tube formation assay using HUVECs and in transgenic zebrafish Tg(fli1a:EGFP) models, respectively. Mechanistic studies indicated that compound 5f induced apoptosis in HepG2 cells through mitochondrial membrane depolarization and increased ROS generation. Molecular docking studies supported experimental findings and showed that 5f can interact with catalytically active residues via hydrogen-bonding interactions. Overall, these results highlight the potential of compound 5f as a promising dual target therapeutic lead with dual direct anticancer and antiangiogenic properties. Full article

Compound repurposing is an efficient method to save both time and costs by redirecting previously synthesized small molecules towards new biological targets. In this research, we employ computational methodologies to investigate and assess target engagement of small molecules as tyrosine kinase inhibitors (TKIs). Therefore, compounds TKI.2a, TKI.2b, TKI.6, TKI.16, TKI.19, and TKI.21b identified from our earlier research, undergo assessments of molecular similarity, docking studies, and pharmacophore modeling along with those discovered through database searches. Compounds TKI.2a, TKI.2b, TKI.6, and TKI.19 appear to exhibit multi-target tyrosine kinase inhibitory activities against VEGFR-2 (Vascular Endothelial Growth Factor Receptor), RET (proto-oncogene tyrosine–protein kinase receptor), PDGFRα (Platelet-Derived Growth Factor Receptor alpha), EGFR (Epidermal Growth Factor Receptor), and HER2 (Human Epidermal Receptor) receptors. Pharmacophore models were applied for ligand-based virtual screening using defined parameters to discover candidate compounds that exhibit drug-likeness with FDA (Food and Drug Administration)-approved tyrosine kinase inhibitors. Molecular docking studies identified lead compounds for each biological target based on their overall affinity values and established interactions. Compound ChEMBL2170947 was found to be the most promising candidate for the VEGFR-2 receptor, ChEMBL5019511 for PDGFRα, ChEMBL2216869 for EGFR, and ChEMBL3355044 for HER2. Full article