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501. Extracellular Vesicles Profiling in Acute Myeloid Leukemia Cell Lines: A Proteomic Characterization.

作者: Beatrice Dufrusine.;Maria Concetta Cufaro.;Alice Di Sebastiano.;Erika Pizzinato.;Pina Nardinocchi.;Ilaria Cicalini.;Serena Pilato.;Antonella Fontana.;Damiana Pieragostino.;Enrico Dainese.;Luca Federici.
来源: Cells. 2025年14卷21期
Extracellular vesicles (EVs) express features of parental cells and are fundamental in modulating the crosstalk between cancer cells and their environment. Increasing evidence suggests that EVs have a pivotal role in tumorigenesis, cancer development, and drug resistance. EVs are also involved in controlling the communication between hematopoietic stem cells and the surrounding microenvironment in the bone marrow (BM), during several processes such as self-renewal, mobilization, and lineage differentiation. Proteins expressed in cancer cell-derived EVs can be useful to further understand the regulation of hematopoietic stem cell fate, a fundamental mechanism in acute myeloid leukemia (AML). Furthermore, EVs are implicated in transmitting drug-resistance mechanisms in solid and not-solid cancer types. Here, using a proteomic approach, we analyze and validate the protein profile of EVs from three AML cell lines with different genotypes, namely OCI-AML-2, OCI-AML-3, and HL-60. The majority of the identified proteins were significantly enriched in the Gene Ontology category 'Extracellular Exosome'. Network model analysis of EV proteins revealed several significantly modulated pathways, including inflammation activation and metastatic processes in AML cell-derived EVs. The EVs proteomic profiling allows us to identify the EVs-associated molecules and pathways that could impact cancer progression and drug resistance.

502. MicroRNAs as Emerging Therapeutic Targets Modulating the Tumor Microenvironment in Head and Neck Squamous Cell Carcinoma.

作者: Roxana Daniela Brata.;Lavinia Marcut.;Alina Cristina Barb.;Alexia Manole.;Alexandru Ciolofan.;Cristina Stefania Dumitru.;Flavia Zara.;Raul Patrascu.
来源: Int J Mol Sci. 2025年26卷21期
Head and neck squamous cell carcinoma (HNSCC) remains one of the most aggressive solid tumors, characterized by marked molecular heterogeneity and a complex tumor microenvironment (TME). Recent evidence highlights the pivotal role of microRNAs (miRNAs) in regulating tumor progression, immune evasion, angiogenesis, and stromal remodeling. This review synthesizes current insights into miRNA-mediated molecular pathways that modulate the TME in HNSCC and discusses emerging therapeutic strategies, including nanocarrier- and exosome-based miRNA delivery systems, targeting these molecules. Key miRNAs, including miR-21, miR-146a, and miR-221, orchestrate bidirectional signaling between cancer cells, fibroblasts, and immune infiltrates, thereby shaping tumor aggressiveness and therapy resistance. Advances in nanotechnology have facilitated the development of miRNA-based therapeutics-such as mimics, antagomiRs, and exosome-mediated systems-capable of restoring physiological expression patterns and reprogramming the TME toward an anti-tumor state. However, clinical translation remains hindered by challenges in targeted delivery, molecular stability, and tumor heterogeneity. By integrating molecular and translational perspectives, this review underscores how miRNA-targeting strategies may evolve into a new generation of precision therapies, bridging the gap between molecular oncology and personalized treatment of head and neck cancer.

503. Butylated Neuropeptide Antagonist Targeting Hypoxia-Induced GRPR Overexpression in Small Cell Lung Cancer.

作者: Suttikiat Deureh.;Amira M Alghamdi.;Ayşe Latif.;Kaye J Williams.;Roben G Gieling.;Harmesh S Aojula.
来源: Int J Mol Sci. 2025年26卷21期
Small cell lung cancer (SCLC) is an aggressive neuroendocrine tumour with limited treatment options and a poor prognosis. Hypoxia, a hallmark of solid tumours, contributes to therapeutic resistance and tumour progression. Gastrin-releasing peptide receptor (GRPR) is known to be overexpressed in SCLC; however, its regulation under hypoxic conditions is not well described. In this study, we demonstrate that hypoxia significantly enhances GRPR expression in SCLC cell lines, COR-L24 and DMS79, as confirmed by Western blot, immunofluorescence, and flow cytometric analysis of binding with fluorescein isothiocyanate-labelled bombesin (BBN-FITC), a known GRPR ligand. To exploit this upregulation, we synthesised a previously discovered butylated neuropeptide antagonist (BU peptide) using a new method of solid-phase peptide synthesis (SPPS) by Boc chemistry and evaluated its therapeutic potential. BU peptide exhibited potent, dose-dependent cytotoxicity in both cell lines, with significantly greater efficacy under hypoxic conditions compared to normoxia. Mechanistic studies revealed that BU peptide inhibits GRP-GRPR-mediated activation of the PI3K/Akt and MAPK/ERK signalling pathways, known to be key regulators of tumour cell survival and proliferation. Moreover, BU peptide induced robust caspase 3/7-mediated apoptosis, especially under hypoxic conditions. These findings suggest that GRPR is a hypoxia-inducible target in SCLC and demonstrate that a synthetically optimised BU peptide antagonist exerts selective efficacy against hypoxic tumour cells, outperforming conventional chemotherapy agents. These findings provide new mechanistic insights into SCLC and suggest translational potential to inform the development of future treatment strategies for this and other hypoxia-driven malignancies.

504. Network Controllability Reveals Key Mitigation Points for Tumor-Promoting Signaling in Tumor-Educated Platelets.

作者: Özge Osmanoglu.;Elif Özer.;Shishir K Gupta.;Katrin G Heinze.;Harald Schulze.;Thomas Dandekar.
来源: Int J Mol Sci. 2025年26卷21期
Therapeutic strategies targeting "tumor-educated platelets" (TEPs) and platelet-tumor interactions by key signaling pathways (ITAM, P2Y12) may reduce metastasis and cancer. Using a TEP gene expression dataset originally created to study swarm intelligence-enhanced detection of lung cancer cells (GSE89843), we did perform extensive transcriptome analysis to integrate these data with directed protein-protein interactions and build a TEP-specific signaling network. We analyze network topology and controllability and identify critical and indispensable nodes, as well as high-weight, usually high-score nodes. We reconstruct (pharmacological) controllable subnetworks of TEP signaling, which we then explore for drugs targets. We found 111 upregulated and 108 downregulated genes compared to control platelets, enriched in pathways related to extracellular matrix interactions, cytoskeleton organization, immune signaling, and platelet activation. Ribosomal function, apoptosis, and immune signaling were among the downregulated processes, highlighting unique TEP profiles in non-small-cell lung cancer (NSCLC). Our integrative analysis of TEPs in NSCLC reveals key transcriptional and network-based alterations harmful for the cancer patient. Using four complementary strategies, we identified five high-confidence genes (Gene symbols always given throughout the paper), ITGA2B, FLNA, GRB2, FCGR2A, and APP, as central to TEP signaling. These can be targeted by FDA-approved drugs. Fostamatinib, an SYK inhibitor, emerged as the top candidate drug to disrupt ITAM-mediated platelet activation selectively; metastasis-promoting metalloprotease and cytoskeletal targets influencing adhesion were also identified. A low-dose combination therapy of fostamatinib, Aducanumab, and acetylsalicylic acid (aspirin) may control TEP effects. In conclusion, our preclinical in silico approach revealed FDA-approved drugs that allow therapeutic targeting of metastasis-promoting TEPs and target NSCLC at the same time.

505. FGFR2 Might Be a Promising Therapeutic Target for Some Solid Tumors: Analysis of 1312 Cancers with FGFR2 Abnormalities.

作者: Hinano Nishikubo.;Dongheng Ma.;Tomoya Sano.;Daiki Imanishi.;Takashi Sakuma.;Canfeng Fan.;Yurie Yamamoto.;Motohiro Yamamori.;Masakazu Yashiro.
来源: Int J Mol Sci. 2025年26卷21期
Genetic abnormalities of the fibroblast growth factor receptor 2 (FGFR2) gene, including amplification, fusions, and mutations, have been reported in various solid tumors. While molecular targeted therapies against FGFR2 fusion have been proved to be useful in cholangiocarcinoma, the therapeutic significance of FGFR2 inhibitors remains unclear in other various solid cancers. Genomic and clinical information from solid tumor cancer gene panel testing cases is consolidated in the Center for Cancer Genomics and Advanced Therapeutics (C-CAT) database in Japan. This study aimed to utilize the C-CAT database to clarify the clinical-pathological significance of FGFR2 abnormalities. A total of 101,231 patients with solid cancer have been registered in the C-CAT database between June 2019 and June 2025. Of the 101,231 cases, 1312 cases with FGFR2 gene abnormalities were analyzed. FGFR2 alterations included amplification in 515 cases, fusion in 280 cases, and mutations in 568 cases. They were detected most frequently in the biliary tract (271 cases), esophagus/stomach (231 cases), and breast (211 cases). Amplification was frequent in the esophagus/stomach (205 cases) and breast (105 cases). Mutations were frequent in the uterus (111 cases), breast (89 cases), and biliary tract (86 cases). Among 515 FGFR2 alteration cases, FGFR2 inhibitors were administered in 85 cases. Of the 85 cases, disease control was achieved in 49 cases, 44 cases of which were biliary tract cancer. FGFR2 might be a promising therapeutic target not only for cholangiocarcinoma with fusion but also for esophagus/stomach cancer and breast cancer with FGFR2 alterations.

506. Investigating the Epigenetic Therapeutic Potential of Natural Compounds in Cancer.

作者: Agnieszka Zaczek.;Aleksandra Rodacka.
来源: Int J Mol Sci. 2025年26卷21期
Natural compounds, including alkaloids, terpenes, and polyphenols, are increasingly recognized for their potential to modulate epigenetic mechanisms and influence cellular function, particularly in cancer. Studies have shown that diverse phytochemicals impact epigenetic modifications, such as DNA methylation, histone modifications, and non-coding RNA expression. Epigenetics is critical in cancer and can dysregulate crucial cellular processes, such as cell proliferation, apoptosis, and differentiation. In cancer, aberrant epigenetic patterns can silence tumor suppressor genes and activate oncogenes, contributing to uncontrolled cell growth and metastasis. Understanding the precise mechanisms by which these natural compounds interact with the epigenetic machinery holds significant promise for developing novel therapeutic strategies for cancer and other diseases. Future research, including basic studies and well-designed clinical trials, will be crucial in validating these findings and developing effective clinical applications of natural compounds.

507. Targeted RNA Degradation as a Promising Therapeutic Strategy.

作者: Sivakumar Komachankandy.;Yeongju Lee.
来源: Int J Mol Sci. 2025年26卷21期
RNAs have recently emerged as versatile therapeutic targets, broadening the scope of drug discovery beyond the conventional protein-centered paradigm. Small-molecule-induced RNA degradation has been established as a promising approach, with novel modalities such as Ribonuclease-Targeting Chimeras (RIBOTACs), bleomycin-conjugated degraders, and imidazole-based RNA degrader demonstrating strong potential. These strategies selectively eliminate disease-associated RNAs by harnessing endogenous ribonucleases, redirecting the nucleic acid-cleaving activity of natural products, or incorporating catalytic warheads. Recent studies have validated therapeutic applications across cancer, neurodegenerative disorders, and viral infections, underscoring the wide-ranging impact of this strategy. Nevertheless, key challenges remain, including the development of more potent recruiters, diversification of degradation mechanisms, optimization of linker chemistry, and overcoming pharmacokinetic limitations. With continued innovation, RNA degraders are expected to evolve into a robust therapeutic platform that expands the druggable space and enables new treatment opportunities for diseases once considered untreatable.

508. Expanding Horizons in Cholangiocarcinoma: Emerging Targets Beyond FGFR2 and IDH1.

作者: Lily Darman.;Quinn Kaurich.;Md Sazzad Hassan.;Urs von Holzen.;Niranjan Awasthi.
来源: Int J Mol Sci. 2025年26卷21期
Cholangiocarcinoma (CCA) is a biliary tract cancer that accounts for approximately 3% of all gastrointestinal cancers. CCA is a "silent" disease that remains undetected for a long period of time, often presenting at an advanced stage with minimal treatment options and a poor prognosis. Advanced CCA remains largely inoperable, and combination gemcitabine plus cisplatin (GemCis) chemotherapy remains the standard treatment for patients affected by this disease. There is a desperate need for new therapeutic alternatives, and extensive research is ongoing to address this gap. Targeted therapies represent a rapidly expanding area of cancer treatment and are currently under active investigation in CCA. The FDA has approved the targeted therapies ivosidenib, pemigatinib, infigratinib, and futibatinib, as well as the immunotherapy durvalumab, for patients with CCA in recent years. Several other therapeutic strategies are still under investigation, targeting molecular pathways including p53/MDM2, JAK/STAT, KRAS, HER2, VEGFR, PDGFR, MET, ALK, MAPK, PI3K/AKT, BRAF, and DNA damage repair signaling. While several promising advancements have been made, further research is required to improve outcomes for patients with CCA. This review provides an up-to-date, comprehensive overview of currently approved targeted therapies in CCA, as well as those under investigation.

509. Sialylation Inhibition Impairs Migration and Promotes Adhesion of GBM Cells.

作者: Deborah Gargano.;Mariangela Calvitto.;Antonella Niro.;Giuseppe Pepe.;Noemi Martella.;Alessia Tani.;Paolo Rosa.;Vittorio Maglione.;Giovanni Musci.;Antimo Cutone.;Sabrina Di Bartolomeo.;Eleonora Sgambati.
来源: Int J Mol Sci. 2025年26卷21期
Aberrant sialylation has been associated with many types of tumors, characterized by aggressiveness and undifferentiated state. However, not exhaustive investigations have been performed on the sialylation status in glioblastoma multiforme (GBM), the most common primary and lethal malignant brain tumor in humans. Hence, in this study we performed a comprehensive characterization of the sialylation status in GBM evaluating specific sialyltransferases and various types of sialic acids (Sias) in different GBM cell lines. First, through in silico analysis we showed that the sialyltransferases ST6GAL1, ST3GAL2 and ST8SIA4 are significantly up-regulated in GBM tissues and related to lower patient survival. Then, we evaluated the expression levels of these sialyltransferases and their related Sias and observed a high variability among the different GBM cell lines. In addition, using the pan-sialyltransferase inhibitor 3-Fax, we highlighted the role of sialylation in some of the main oncogenic properties of GBM. Indeed, a significant reduction in mobility and migration capacity along with increased adhesiveness of GBM cells was observed upon sialyltransferases inhibition. Our findings showed that aberrant expression of different Sias types is crucial for cell migration and adhesion ability of GBM cells, suggesting that Sias might represent biomarkers for GBM and be useful to design innovative therapeutic strategies.

510. ADAM10 Knockout from Human Glioblastoma and Colon Cancer Cells Modulates Diverse Signalling Networks and Inhibits Tumour Growth In Vivo.

作者: Hengkang Yan.;Sakshi Arora.;Linda Hii.;Carmen Llerena.;Mary E Vail.;Amr Allam.;James R W Conway.;Joel R Steele.;Han-Chung Lee.;Ralf B Schittenhelm.;Andrew M Scott.;Peter W Janes.
来源: Int J Mol Sci. 2025年26卷21期
ADAM10 is a transmembrane metalloprotease that regulates diverse signalling functions via the shedding of membrane protein ectodomains, and is implicated in tumour development, including glioblastoma multiforme (GBM) and gastrointestinal (GI) cancers, where high ADAM10 expression is associated with poor prognosis. We assessed the role of ADAM10 by gene knockout (KO) in U251 GBM cells, and its effects on protein shedding and protein expression on cell proliferation and on the growth of tumour xenografts in mice. The growth of tumours was severely delayed, relative to modest effects on proliferation in vitro, suggesting roles particularly in the context of the tumour microenvironment (TME). Proteomics analysis of KO cell-conditioned medium showed decreased levels of known ADAM10 targets such as Notch and Eph receptors and ligands, as well as other proteins involved in cell-cell adhesion, migration, signalling, metabolism, differentiation, and development, including angiogenesis. KO cell and tumour lysate analysis also showed modulation of proteins associated with metabolic and catalytic activity, cell-matrix organisation and differentiation. Similar effects were also observed in the SW620 colon cancer model, indicating broader significance. Furthermore, expression of the associated protein sets also correlated with ADAM10 expression in human GBM and colon cancer specimens (TCGA datasets), indicating clinical relevance. Collagens and proteins associated with matrix deposition and fibril organisation were notably reduced in ADAM10 KO GBM tumours, and histology confirmed decreased collagen fibrils and blood vessels. Unexpectedly, increased chondrocyte differentiation was evident in ADAM10 KO U251 tumours, suggesting a role for ADAM10 in maintaining an undifferentiated phenotype in vivo. Together, our data indicate the importance of ADAM10 in diverse signalling mechanisms in tumours and the TME that promote tumour development.

511. Is PTEN rs397510595 an Unexpected Guardian in Canine Mammary Neoplasia?

作者: Ana Canadas-Sousa.;Marta Santos.;Patrícia Dias-Pereira.
来源: Int J Mol Sci. 2025年26卷21期
Despite steps having been taken to study the influence of genetic polymorphisms in canine mammary neoplasia, the knowledge of their relevance is still incipient compared to the knowledge of human breast cancer. Among tumor suppressor genes, PTEN plays a pivotal role in carcinogenesis; however, the contribution of its constitutional variants to the biology of canine mammary neoplasia remains poorly understood. This observational study assessed the association between PTEN SNPs rs397510595 and rs397513087, genotyped from peripheral blood, and the clinicopathological features, including survival, in a cohort of 206 female dogs with mammary neoplasia. The minor A allele of rs397510595 was present in 17.5% of the population. Carriers of the variant allele were more frequently diagnosed at a late age ≥ 11 years, displayed a complete absence of vascular invasion, and exhibited significantly longer overall survival (mean 22.2 vs. 19.5 months). The SNP rs397513087 did not show a significant association with clinicopathological features or survival. Our data suggests that SNP rs397510595 of the PTEN gene is a putative protective factor for developing canine mammary neoplasia at an early age and might be used as a biomarker for prognostic assessment in dogs with malignant mammary neoplasia.

512. Molecular Implications of ADIPOQ, GAS5, GATA4, and YAP1 Methylation in Triple-Negative Breast Cancer Prognosis.

作者: Mateusz Wichtowski.;Agnieszka Kołacińska-Wow.;Katarzyna Skrzypek.;Ewa Jabłońska.;Katarzyna Płoszka.;Damian Kołat.;Sylwia Paszek.;Izabela Zawlik.;Elżbieta Płuciennik.;Natalia Potocka.;Wojciech Fendler.;Paweł Kurzawa.;Paweł Bigos.;Łukasz Urbański.;Paulina Gibowska-Maruniak.;Thomas Wow.
来源: Int J Mol Sci. 2025年26卷21期
The aim of this study was to investigate the prognostic and predictive properties of four specific genes in triple-negative breast cancer (TNBC). We focused on ADIPOQ, GAS5, GATA4, and YAP1, which are known for their roles in key molecular pathways related to tumorigenesis, such as adipokine signaling, lncRNA regulation, transcriptional control, and Hippo signaling, but have not been sufficiently explored in the context of epigenetic regulation in breast cancer. Using the methylospecific PCR (MSP) method, we analyzed the methylation of the four genes in the tumor tissues collected from 57 TNBC patients. We evaluated their association with response to neoadjuvant treatment and clinicopathological characteristics. Additionally, we performed a bioinformatic analysis of methylation and expression data from The Cancer Genome Atlas (TCGA) TNBC cohort to explore their relationships with overall survival (OS), disease-specific survival (DSS), disease-free interval (DFI), progression-free interval (PFI), and relapse-free survival (RFS). No significant associations were observed between methylation patterns and clinicopathological characteristics in the patients. However, in silico analysis of the TNBC cohort identified ADIPOQ methylation as having the most significant associations, correlating with all five survival endpoints, including OS, DSS, DFI, PFI, and RFS. GAS5 methylation was significantly associated with OS, DSS, and RFS, and GATA4 methylation showed significant associations with PFI, whereas YAP1 methylation was significantly associated with OS and RFS. In addition, GAS5 expression was linked to DSS, DFI and RFS. This study highlights the potential prognostic significance of the epigenetic regulation of ADIPOQ in TNBC. The in silico findings shed light on the molecular pathways associated with TNBC progression and warrant further investigation to validate their role in clinical outcomes and underlying biological mechanisms.

513. Manipulation with Mutational Status of VHL Regulates Hypoxic Metabolism and Pro-Angiogenic Phenotypes in ccRCC Caki-1 Cells.

作者: Pavel Abramov.;Alexandr Mazur.;Aleksey Starshin.;Svetlana Zhenilo.;Egor Prokhortchouk.
来源: Int J Mol Sci. 2025年26卷21期
Clear cell renal cell carcinoma (ccRCC), accounting for 80-90% of renal malignancies, is frequently driven by VHL inactivation-either through mutation or promoter hypermethylation-resulting in constitutive HIF2α activation and pseudohypoxic signaling. VHL gene inactivation is a hallmark of von Hippel-Lindau syndrome, a hereditary disorder predisposing patients to ccRCC and other tumors, underscoring its central role in disease pathogenesis. While VHL dysfunction promotes aggressive tumor phenotypes, the therapeutic potential of VHL restoration remains underexplored. Here, using the Cas9 induced VHL-mutation in the Caki-1 cell line model, we demonstrate that VHL inactivation augments hypoxia-like pathways and enhances anaerobic glycolysis. Rescue of functional VHL reversed these activation patterns and modulated the expression of genes associated with angiogenesis. Using single cell transcriptomics, we show that the VHL-positive and -negative Caki-1 cells are characterized with different proportions of benign and aggressive cells as seen by analysis of specific gene expression. Furthermore, the identified angiogenesis-related genes were linked to affect clinical outcomes in ccRCC patients, suggesting that VHL restoration may mitigate high-risk molecular features.

514. Inhibition of Fatty Acid-Binding Protein 4 Limits High-Fat-Diet-Associated Prostate Tumorigenesis and Progression in TRAMP Mice.

作者: Mingguo Huang.;Shintaro Narita.;Hiromi Sato.;Yuya Sekine.;Mizuki Kobayashi.;Soki Kashima.;Ryohei Yamamoto.;Atsushi Koizumi.;Taketoshi Nara.;Kazuyuki Numakura.;Mitsuru Saito.;Hiroshi Nanjo.;Takayuki Ikezoe.;Tomonori Habuchi.
来源: Int J Mol Sci. 2025年26卷21期
Fatty acid-binding protein 4 (FABP4) is an important adipokine associated with inflammatory responses and metabolic regulation. Although a high-fat diet (HF) and/or HF-mediated obesity have been clearly linked to the progression of prostate cancer, with FABP4 potentially playing a critical role in this relationship, the mechanisms by which FABP4 facilitates this interaction remain unclear. After generating FABP4 knockout (FABP4-/-) transgenic adenocarcinoma of the mouse prostate (TRAMP) mice, it was found that FABP4-/- TRAMP mice presented significantly ameliorated prostate tumorigenesis and tumor progression along with decreased body weight, protumorigenic cytokine secretion, and pan-amino acid synthesis when compared to TRAMP mice under the HF condition. Additionally, treatment with BMS309403-a chemical inhibitor of FABP4-was observed to abrogate the HF-mediated TRAMP tumor progression, along with reductions in body weight and cytokine production. Thus, FABP4 plays an essential role in the progression of HF-mediated prostate cancer through the modulation of metabolic and inflammatory pathways, providing a potential therapeutic target for prostate cancer.

515. Combinative Treatment of the PARP Inhibitor Olaparib and Antimetastasis Ruthenium(II)-Arene Compound RAPTA-T for Triple-Negative BRCA1 Wild-Type Breast Cancer Cells.

作者: Adisorn Ratanaphan.
来源: Int J Mol Sci. 2025年26卷21期
To date, breast cancer remains one of the leading causes of death among women worldwide. Although various treatments are used in clinical settings, the efficacy and safety of such treatments are limited by tumor biology factors and patient preferences. Previous studies have shown that triple-negative BRCA1-deficient breast cancer is susceptible to DNA-damaging agents, including platinum-based drugs and poly(ADP-ribose) polymerase (PARP) inhibitors, alone or in combination. To address whether the combinative treatment of these DNA-damaging agents can be extended to the triple-negative BRCA1-proficient breast cancer population, we investigated the anticancer activity of the well-known FDA-approved PARP inhibitor olaparib in combination with the antimetastatic ruthenium(II)-arene PTA compound RAPTA-T for triple-negative BRCA1-competent breast cancer cells (MDA-MB-468 and MDA-MB-231), with consideration of sporadic breast cancer MCF-7 cells. RAPTA-T, olaparib, and the combined agents exhibited a dose-dependent inhibition of breast cancer cell growth in selected breast cancer cells. The combination compound inhibited colony formation most effectively in MDA-MB-468 cells. Additionally, the scratch-wound assay showed that MDA-MB-468 cells migrated more slowly than MCF-7 and MDA-MB-231 cells. The results indicated that the olaparib and RAPTA-T combination can reduce or inhibit the survival, invasion, and metastasis of breast cancer cells. Moreover, the combined agents promoted apoptotic cell death, with a higher percentage of apoptosis observed in MDA-MB-468 cells than in MDA-MB-231 and MCF-7 cells. Olaparib and RAPTA-T also interfered with cell cycle progression, with the greatest inhibition observed in the S and G2/M phases of MCF-7 cells (1.6- and 3.4-fold), followed by MDA-MB-468 cells (1.6- and 1.8-fold) and MDA-MB-231 cells (1.5- and 1.4-fold). Interestingly, MDA-MB-468 cells presented the highest degree of inhibition for BRCA1 replication and BRCA1 expression. The p53, PARP, and Chk1 proteins were more strongly upregulated in MDA-MB-231 cells than in Ru-untreated control cells. Moreover, the expression levels of protein biomarkers associated with the epithelial-to-mesenchymal transition (EMT), including E-cadherin and SLUG, were remarkably reduced in all tested breast cancer cells. Together, our results show the feasibility of extending the application of PARP inhibitors beyond breast cancer with BRCA1 mutations and optimizing the combinative treatment of PARP inhibitors with antimetastasis ruthenium-based chemotherapy as new therapeutic approaches for TNBC harboring wild-type BRCA1.

516. A Novel Germline Frameshift Variant in the Tumor Suppressor Gene OBSCN in a Melanoma Patient.

作者: Barbara Anna Bokor.;Aliasgari Abdolreza.;Margit Pál.;Zita Battyani.;Márta Széll.;Nikoletta Nagy.
来源: Int J Mol Sci. 2025年26卷21期
Malignant melanoma is a complex malignancy with genetic, environmental, and lifestyle factors in its etiology. While germline variants in melanoma predisposition genes have been described, many patients remain genetically unexplained after panel testing. We previously analyzed a Hungarian melanoma cohort (n = 17), identifying variants in predisposing or susceptibility genes in 58.82% of patients. For individuals negative on this melanoma-specific panel, we expanded testing to a 19-gene panel associated with multiple cancer types. Next-generation sequencing was performed, followed by Sanger sequencing for confirmation. Variants were classified according to ACMG guidelines. In a 58-year-old female patient with a history of primary cutaneous melanoma, we identified a novel heterozygous frameshift variant in the tumor suppressor gene OBSCN (c.21322_21323insCTGG, p.G7108AfsTer10; NM_001386125.1). This insertion introduces a premature stop codon in exon 89 within the immunoglobulin-like domain, predicting protein truncation. Classified as likely pathogenic (PVS1, PM2), the variant is absent from population databases. To date, somatic OBSCN mutations have been reported in melanoma. This first report of a germline OBSCN frameshift variant in melanoma expands the genetic landscape of melanoma predisposition and suggests that OBSCN may represent a candidate gene contributing to melanoma risk.

517. A Brief Review on the Role of the Transcription Factor PBX1 in Hematologic Malignancies.

作者: Sofia Chatzileontiadou.;Kassiani Boulogeorgou.;Christina Frouzaki.;Maria Papaioannou.;Triantafyllia Koletsa.;Evdoxia Hatjiharissi.
来源: Int J Mol Sci. 2025年26卷21期
Pre-B-cell leukemia factor 1 (PBX1) is a transcription factor that plays a significant role in various physiological, developmental, and oncogenic processes in humans. The mechanisms and interactions of PBX1 in both solid and hematologic malignancies remain significant areas of study. It was initially found in pre-B-cell acute lymphoblastic leukemia as a result of the chromosomal translocation t(1;19). Over the years, its role in other blood neoplasms has been studied. PBX1 and its variant E2A::PBX1 regulate gene expression that influences cell proliferation and differentiation in hematopoietic lineages. Their interaction with oncogenic partners results in abnormal gene regulation and tumorigenesis. Research has predominantly focused on the role of these factors in leukemias and plasma cell neoplasms, whereas other hematologic neoplasms have been largely overlooked. The potential application of PBX1 as a prognostic and predictive biomarker has recently gained attention. However, further research is needed to fully understand its complex role and how it can be targeted for therapeutic purposes. This review summarizes current knowledge on PBX1's role in the growth of both mature and immature hematologic neoplasms. Moreover, it focuses on its prospective use as a therapeutic target and to predict prognosis, especially for aggressive neoplasms that do not respond to current therapeutic approaches.

518. Establishment and Characterization of OS-MET-R-092: A Novel Patient-Derived Cell Culture from an Osteosarcoma Bone Metastasis.

作者: Veronica Giusti.;Leonardo Fantoni.;Monica Torsello.;Giorgio Frega.;Arianna Martinuzzi.;Giulia Sbanchi.;Caterina Dalrio.;Enrico Lucarelli.;Chiara Bellotti.;Chiara Casotti.;Elena Caddeo.;Ania Naila Guerrieri.;Simona Paglia.;Claudia Maria Hattinger.;Massimo Serra.;Margherita Maioli.;Marco Gambarotti.;Stefania Benini.;Luca Cattini.;Davide Maria Donati.;Toni Ibrahim.;Laura Mercatali.
来源: Int J Mol Sci. 2025年26卷21期
Bone metastases from osteosarcoma occur in only 10% of patients, and related preclinical models are lacking. A patient diagnosed with pelvic osteosarcoma developed a metachronous scapular metastasis and was treated with multi-agent chemotherapy and surgery. Patient-derived tissue fragments (PDTFs) were obtained from leftover material after diagnosis and biobanking. PDTFs were grown on chick chorioallantoic membrane, establishing an in vivo-like predictive model. Additionally, we obtained a patient-derived cell culture, OS-MET-R-092, which has been maintained in vitro for nearly one year. OS-MET-R-092 cells were authenticated based on short tandem repeats and on their morphology when grown on commercial 3D scaffolds. Using U-2 OS and SaOS-2 as controls, we characterized growth, clonogenic potential, ability to form spheroids, migration, osteogenic differentiation, and expression of related genes. OS-MET-R-092 cells showed a low proliferation rate, impaired differentiation potential, and migratory abilities comparable to SaOS-2, while expressing higher levels of some MMPs and CD44. Functionally, OS-MET-R-092 cells demonstrated a resistant phenotype to doxorubicin, cisplatin, gemcitabine, and docetaxel, corroborated by higher expression of chemo-resistance-related genes. Collectively, OS-MET-R-092 represents a valuable tool for studying bone metastasis from osteosarcoma across various experimental settings and serves as the foundational building block for composite and translatable 3D models.

519. Acalabrutinib May Offer a New Therapeutic Approach for Consolidation and Maintenance of Primary CNS Lymphoma with Expression of MYD88 and CD79B Gene Variants: A Case Report and Literature Review of Primary CNS Lymphoma in the BTKi Era.

作者: Eleanor Allison.;Ashlea Campbell.;Anne-Marie Watson.;Brendan Beaton.
来源: Int J Mol Sci. 2025年26卷21期
We present the case of a patient with primary CNS lymphoma (PCNSL), with MYD88 and CD79B gene variants, who was unable to complete standard induction and consolidation treatment due to toxicity and co-morbidities after three cycles of MATRix. Although he had responded to truncated induction, acalabrutinib, the BTK inhibitor, was used in an attempt to consolidate and maintain his response. He has an ongoing remission at 18 months of follow-up. Following the case presentation, we provide a review of PCNSL, the evolution of therapy, and how BTK inhibitors are now emerging treatments incorporated into the salvage of relapsed and refractory disease and into first-line treatment in some clinical trials. This is the first reported case in the literature of acalabrutinib use for consolidation and maintenance of PCNSL. We hope this can support clinical trial design for BTKi use in this setting in the future.

520. Anti-Metastatic Effects of Plukenetia volubilis (Sacha Inchi) Husk Extract via EGFR and EMT Pathways and Other Antitumor Effects in Colon Cancer.

作者: Supawadee Osotprasit.;Saowaros Suwansa-Ard.;Scott F Cummins.;Tianfang Wang.;Tepparit Samrit.;Athit Chaiwichien.;Stuart J Smith.;Narin Changklungmoa.;Pornanan Kueakhai.
来源: Int J Mol Sci. 2025年26卷21期
Colorectal cancer treatment primarily relies on chemotherapy, which often causes significant side effects. Sacha inchi, a plant known in traditional medicine, has shown promise in various therapeutic applications. However, despite its potential, the specific mechanisms remain poorly understood, particularly regarding its husk components. This study investigates sacha inchi husk extract's chemical properties and its effects on human colorectal cancer cells. GC/MS and LC/MS analyses revealed a rich profile of phenolic and flavonoid compounds, with naringenin and lidocaine as predominant components. The extract demonstrated significant dose-dependent inhibition of colorectal cell migration, invasion, and colony formation while exhibiting no cytotoxicity toward normal colon epithelial cells. Transcriptomic and proteomic analyses showed downregulation of migration- and invasion-related genes in cancer cells, and Western blot analysis confirmed reduced expression of MMP2, MMP9, and N-cadherin. EGFR pathway analysis showed decreased expression of RAS (-0.2-fold), MAK (-0.26-fold), and ERK (-0.54-fold) genes, indicating suppression of epithelial-mesenchymal transition (EMT). These findings demonstrate that sacha inchi husk extract effectively inhibits metastasis in colorectal cancer cells through the upstream (EGFR) and downstream (EMT) pathways, suggesting its potential as a dietary supplement or therapeutic agent for colorectal cancer treatment. Our research provides evidence for the development of natural, less toxic alternatives.
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