Isoquercitrin promotes ferroptosis and oxidative stress in nasopharyngeal carcinoma via the AMPK/NF-κB pathway.

Isoquercitrin has been discovered with various biological properties, including anticancer, anti-inflammation, antioxidation, and neuroprotection. The aim of this study is to explore the efficacy of isoquercitrin in nasopharyngeal carcinoma (NPC) and to disclose its potential regulating mechanisms. CNE1 and HNE1 cells were treated with various concentrations of isoquercitrin. Ferrostatin-1 (Fer-1, a ferroptosis inhibitor) and alpha-lipoic acid (ALA, an activator of the AMP-activated protein kinase [AMPK] pathway) treatments were conducted to verify the effects of isoquercitrin, respectively. Cell viability, proliferation, reactive oxygen species (ROS) generation, and lipid peroxidation were determined, respectively. GPX4 expression and ferroptosis- and pathway-related protein expression were measured. A xenograft tumor model was constructed by subcutaneously inoculating CNE1 cells into the middle groin of each mouse. We found that the IC50 values of CNE1 and HNE1 cells were 392.45 and 411.38 µM, respectively. CNE1 and HNE1 viability and proliferation were both markedly reduced with the increasing concentration of isoquercitrin. ROS generation and lipid peroxidation were both enhanced with declined ferroptosis-related markers under isoquercitrin treatment. The nuclear factor kappa B (NF-κB) pathway, the AMPK pathway, and the interleukin (IL)-1ß expression were all markedly suppressed by isoquercitrin. Moreover, isoquercitrin restrained the tumor growth and enhanced lipid peroxidation and ferroptosis in vivo. Interestingly, both Fer-1 and ALA treatments distinctly offset isoquercitrin-induced effects in vitro and in vivo. These findings indicated that isoquercitrin might enhance oxidative stress and ferroptosis in NPC via AMPK/NF-κB p65 inhibition.

Role of CD23 Activated ERK Signaling Pathway in the Pathogenesis of Eosinophilic Chronic Sinusitis with Nasal Polyps.

Objective: In the context of the rising prevalence of eosinophilic chronic sinusitis accompanied by nasal polyps, this study aims toinvestigate the role of CD23 in the pathogenesis of eosinophilic chronic sinusitis with nasal polyps. Methods: The cross-sectional study was conducted, 75 patients with chronic sinusitis and nasal polyps treated in our hospital from January 2019 to May 2021 were selected, including 40 cases of eosinophilic patients with the average age of 29.92 years and 35 cases of non-eosinophilic patients with the average age of 30.05 years and 30 patients with the average age of 30.14 years who underwent skull base benign tumor resection in our hospital were selected as the control group, the expression of CD23 in polyp tissue was detected by immunohistochemistry, and the expression of CD23, p-ERK and CCL20 in polyp tissue were detected by Western blot. Specifically, tissue samples were processed and subjected to staining using specific antibodies targeting CD23. The stained sections were then visualized under a microscope to determine the expression levels of CD23. CD23, p-ERK, and CCL20 expressions in polyp tissue were evaluated via Western blot. Total protein was extracted, separated on a gel, transferred to a membrane, and probed with specific antibodies. Chemiluminescence allowed visualization and quantification of protein expressions. Results: Immunohistochemistry showed that CD23 expression was high in the eosinophilic group but low in the non-eosinophilic and control groups. The relative expression levels of CD23 protein, p-ERK protein, and CCL20 protein in polyp tissue s of the eosinophilic group were (0.892 ± 0.092), (0.733 ± 0.101) and (0.813 ± 0.106), respectively, which were significantly higher than those in non-eosinophilic group and control group (P < .05). The relative expression levels of CD23 protein, p-ERK protein, and CCL20 protein in the non-eosinophilic group were (0.461 ± 0.087), 0.412 ± 0.096) and (0.424 ± 0.098), which were significantly higher than those in the control group (P < .05). The relative expression level of CD23 protein in the eosinophilic group was positively correlated with the relative expression levels of p-ERK protein and CCL20 protein (P < .05). The Lund-Kennedy score in the eosinophilic group was (6.10 ± 1.01), which was significantly higher than that in the non-eosinophilic group (P < .05). The relative expression level of CD23 protein in the eosinophilic group was positively correlated with Lund-Kennedy score (P < .05). Conclusion: Eosinophilic chronic sinusitis with nasal polyp mucosal tissue CD23 expression is up-regulated, which is positively correlated with the ERK signaling pathway and disease severity. This study provides valuable insights into potential therapeutic targets that could be explored to develop future treatment modalities. The potential clinical significance of the study is to reveal the important role of CD23 in the pathogenesis of chronic sinusitis with nasal polyps. The upward adjustment of CD23 is positively related to the severity of the disease, which provides valuable guidance for future treatment strategies. This discovery may provide new ways for the development of CD23 treatment methods, so as to better control the progress of the disease of eosinophilic chronic sinusitis with nasal polyps. Further research can explore the molecular mechanism of CD23 regulation, further verify the feasibility of CD23 as the treatment target, and evaluate the potential value of CD23 as a prognostic logo.

METTL3-mediated m6A modification promotes processing and maturation of pri-miRNA-19a to facilitate nasopharyngeal carcinoma cell proliferation and invasion.

The interplay between N6-methyladenosine (m6A) modification and microRNAs (miRs) participates in cancer progression. This study is conducted to explore the role of miR-19a-3p in nasopharyngeal carcinoma (NPC) cell proliferation and invasion. Reverse transcription quantitative polymerase chain reaction and Western blot showed that miR-19a-3p was upregulated in NPC tissues and cells and related to poor prognosis, methyltransferase-like 3 (METTL3) was highly expressed, whereas BMP and activin membrane-bound inhibitor (BAMBI) was weakly expressed in NPC tissues and cells. miR-19a-3p downregulation inhibited cell proliferation and invasion, whereas miR-19a-3p overexpression played the opposite role. m6A quantification and m6A RNA immunoprecipitation assays showed that METTL3-mediated m6A modification promoted the processing and maturation of pri-miR-19a via DiGeorge syndrome critical region gene 8 (DGCR8). Dual-luciferase assay showed that BAMBI was a target of miR-19a-3p. The rescue experiments showed that BAMBI downregulation reversed the role of miR-19a-3p inhibition in NPC cells. A xenograft tumor model showed that METTL3 downregulation inhibited tumor growth via the miR-19a-3p/BAMBI in vivo. Overall, our findings elicited that METTL3-mediated m6A modification facilitated the processing and maturation of pri-miR-19a via DGCR8 to upregulate miR-19a-3p, and miR-19a-3p inhibited BAMBI expression to promote NPC cell proliferation and invasion, thus driving NPC progression.

The effectiveness of motherwort injection in preventing postabortion hemorrhage after induced abortion: A protocol for systematic review and meta-analysis.

BACKGROUND: Unintended pregnancy is a problem that women encounter throughout their reproductive age. Excessive and prolonged uterine bleeding is one of the most common and critical adverse reactions of induced abortion, for it increases the risk of anemia and intrauterine infection. To provide reliable clinical evidence, we performed a protocol for systematic review and meta-analysis to evaluate the hemostatic effect of motherwort in postabortion. METHODS: This review protocol has been registered in the international prospective register of systematic reviews. The statement of Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols will be used as guidelines for reporting present review protocol. Original clinical randomized controlled trials assessing the beneficial effects and safety of motherwort on induced abortion will be included. Databases searched include China National Knowledge Infrastructure, Chinese Scientific Journals Database, Wanfang Database, China Biological Medicine Database, PubMed, and EMBASE Database and Cochrane Central Register of Controlled Trials. Cochrane collaboration tool is used to assess the risk of bias of included randomized controlled trials. All calculations are carried out with Stata 11.0 (The Cochrane Collaboration, Oxford, United Kingdom). RESULTS: This systematic review and meta-analysis will provide a detailed summary of the current evidence related to the efficacy of motherwort injection preventing postabortion hemorrhage after induced abortion. CONCLUSION: This evidence will be useful to practitioners, patients, and health policy-makers regarding the use of motherwort injection in induced abortion.

FTH1 indicates poor prognosis and promotes metastasis in head and neck squamous cell carcinoma.

Background: Currently, ferritin heavy chain (FTH1) has been increasingly found to play a crucial role in cancer as a core regulator of ferroptosis, while its role of non-ferroptosis in head and neck squamous cell carcinoma (HNSCC) is still unclear. Methods: Herein, we analyzed the expression level of FTH1 in HNSCC using TCGA database, and FTH1 protein in HNSCC tissues and cell lines was determined by immunohistochemistry (IHC) and western blotting, respectively. Then, its prognostic value and relationship with clinical parameters were investigated in HNSCC patients. Additionally, the biological function of FTH1 in HNSCC was explored. Results: The current study showed that FTH1 is significantly overexpressed in HNSCC tissues and related to poor prognosis and lymph node metastasis of HNSCC. FTH1 knockdown could suppress the metastasis and epithelial-mesenchymal transition (EMT) process of HNSCC. Conclusion: Our findings indicate that FTH1 plays a critical role in the progression and metastasis of HNSCC and can serve as a promising prognostic factor and therapeutic target in HNSCC.

Upregulated METTL3 in nasopharyngeal carcinoma enhances the motility of cancer cells.

The roles of RNA m6A modification in carcinogenesis have attracted much interest recently. However, the dysregulation of RNA m6A regulators (writers, readers, and erasers) in nasopharyngeal carcinoma (NPC) has never been reported. In this study, we showed that METTL3, one of the writers, was upregulated in NPC. Functional studies revealed that METTL3 promoted the migration and invasion of NPC cells. However, METTL3 knockdown reversed this effect and inhibited the migration, invasion and metastasis of NPC cells. METTL3 activated the luciferase activity of TOPflash (a reporter for beta-catenin/TCF signaling), and downregulation of METTL3 inhibited the expression of beta-catenin/TCF target genes vimentin and N-cadherin, which are two regulators of epithelial-mesenchymal transition. Moreover, dominant negative beta-catenin blocked the migration and invasion of NPC cells. Further mechanistic studies showed that METTL3 silencing decreased the m6A methylation and total mRNA levels of Tankyrase, a negative regulator of axin. Moreover, Tankyrase overexpression abrogated the repressive effects of METTL3 silencing on the migration of NPC cells. Collectively, our study demonstrates the oncogenic roles of METTL3 in NPC, and suggests that METTL3 might be a therapeutic target for NPC.

Circular RNA Expression Profiles in Nasopharyngeal Carcinoma by Sequence Analysis.

Circular RNAs (circRNAs), as a burgeoning sort of non-coding RNAs (ncRNAs), can regulate the expression of parental genes as miRNA sponges. This study was designed to explore the circRNA expression profile of nasopharyngeal carcinoma (NPC). High-throughput sequencing was performed to identify the circRNA expression profile of NPC patients compared with healthy controls. A total of 93 upregulated circRNAs and 77 downregulated circRNAs were identified. The expression levels of the top three upregulated and three downregulated circRNAs annotated by circBase were validated by quantitative real-time PCR (qRT-PCR). GO and KEGG analyses showed that these differentially expressed circRNAs were potentially implicated in NPC pathogenesis. CircRNA-miRNA-target gene network analysis revealed a potential mechanism that hsa_circ_0002375 (circKITLG) may be involved in NPC through sponging up miR-3198 and interfering with its downstream targets. Silencing of circKITLG inhibited NPC cell proliferation, migration, and invasion in vitro. This study provides a leading and fundamental circRNA expression profile of NPC.

RIPK4 promoted the tumorigenicity of nasopharyngeal carcinoma cells.

RIPK4 (receptor interacting serine/threonine kinase 4) has been reported to be aberrantly expressed in several cancer types. However, its expression pattern and functions in nasopharyngeal carcinoma (NPC) have never been reported. In this study, we have shown that the expression of RIPK4 was up-regulated in NPC tissues. RIPK4 promoted the growth and anchorage-independent growth of NPC cells, and down-regulation of RIPK4 inhibited the growth of NPC cells both in the plate-based culture and on the soft agar. Moreover, RIPK4 promoted the expression of VEGF in the NPC cells and induced the tube formation of HUVEC, and Axitinib (the inhibitor for VEGF receptor) inhibited the tumorigenesis driven by RIPK4. In the molecular mechanism study, RIPK4 was found to enhance the interaction between IKKα and IKKß, and activated NF-kB signaling. Taken together, our study demonstrated the oncogenic roles of RIPK4 in NPC and suggested that RIPK4 might be a therapeutic target.