Inhibition of FSP1: A new strategy for the treatment of tumors (Review)

Design, synthesis and biological evaluation of triazolothiadiazole derivatives as FSP1 inhibitors for sensitizing cancer cells to ferroptosis

Ferroptosis suppressor protein 1 (FSP1) is a recently identified ferroptosis suppressor that functions independently of the glutathione peroxidase reductase 4 (GPX4)-mediated pathway. Mechanistically, FSP1 mitigates ferroptosis by catalyzing the reduction of ubiquinone to ubiquinol and vitamin K (VK) to hydroquinone, thereby reducing lethal lipid peroxidation through the neutralization of free radicals. In this study, we designed and synthesized 32 compounds to systematically explore their structure-activity relationship (SAR) with the aim of identifying potent and novel FSP1 inhibitors. Among these, compound 39, a triazolothiadiazole derivative, exhibited the most significant inhibitory activity against FSP1, with an IC50 value of 35 nM. In vitro cellular assays demonstrated that compound 39 markedly enhanced RSL3-induced lipid peroxide (LPO) accumulation and sensitized cancer cells from diverse tissue origins to RSL3-induced ferroptosis. Furthermore, by exploiting the FSP1-mediated reduction of VK, compound 39 effectively augmented ferroptosis in HT1080 cells pretreated with RSL3 and VK through its potent inhibition of FSP1 activity. To the best of our knowledge, this study represents the first pharmacochemical investigation dedicated to the systematic design and synthesis of FSP1 inhibitors. Collectively, our findings underscore the profound impact of compound 39 on tumor ferroptosis, providing a promising foundation for the development of FSP1 inhibitors as potential therapeutic agents in cancer treatment.

Epigenetic and post-translational modifications in ferroptosis regulation and hepatocellular carcinoma: New frontiers in therapeutic targeting

Hepatocellular carcinoma (HCC), the predominant kind of liver cancer, continues to be a significant contributor to cancer-related deaths globally, influenced by intricate molecular processes and strong resistance to existing chemotherapy. Iron-dependent lipid peroxidation induces ferroptosis, a controlled form of cell death that plays a crucial role in inhibiting tumor growth and treatment resistance in HCC. Recent research has shown that epigenetic modifications, such as DNA methylation, histone modifications, regulation by non-coding RNAs (ncRNAs), and post-translational modification (PTM) like ubiquitination, phosphorylation, acetylation, and methylation, play a crucial role in fine-tuning ferroptosis. These alterations alter the structure of chromatin, gene expression, and protein function, thereby affecting cancer cells' fate. This review emphasizes the complex functions of epigenetic and post-translational alterations in controlling ferroptosis, providing valuable insights into their potential as therapeutic targets in HCC. The unraveling of these pathways offers a significant opportunity for novel therapies targeted at surmounting drug resistance and enhancing patient outcomes in liver cancer.

The potential of natural herbal plants in the treatment and prevention of non-small cell lung cancer: An encounter between ferroptosis and mitophagy

ETHNOPHARMACOLOGICAL RELEVANCE

Chinese herbal medicine constitutes a substantial cultural and scientific resource for the Chinese nation, attracting considerable scholarly interest due to its intrinsic characteristics of "multi-component, multi-target, and multi-pathway" interactions. Simultaneously, it aligns accurately with the intricate and continuously evolving progression of non-small cell lung cancer (NSCLC). Furthermore, contemporary pharmacological studies indicate that natural herbaceous plants and their bioactive compounds exhibit a diverse array of biological activities, including antioxidant, anti-inflammatory, and anti-tumor effects, among others. Additionally, these substances have been demonstrated to possess a degree of safety, particularly in terms of exhibiting comparatively lower levels of toxicity to the liver and kidneys when contrasted with conventional Western medicine. Thus, the development of herbal plants, which includes both single herbs and composite formulations, as well as their bioactive constituents, through the targeted regulation of ferroptosis and mitophagy, presents substantial potential and instills considerable hope for individuals diagnosed with NSCLC.

AIM OF THE REVIEW

This review aims to conduct a critical analysis of the ethnopharmacological applications of natural herbaceous plants in relation to ferroptosis and mitophagy in NSCLC. The objective is to evaluate the potential advantages of prioritizing specific phytochemical constituents found in these plants, which may serve as novel therapeutic candidates informed by ethnobotanical knowledge. Additionally, this study seeks to enhance the current pharmacological applications of natural herbaceous plants.

METHODS

An investigation into natural herbal remedies for NSCLC was conducted, with a particular emphasis on the ferroptosis and mitophagy pathways. This study utilized traditional medical texts and ethnomedicinal literature as primary sources. Furthermore, relevant information related to ethnobotany, phytochemistry, and pharmacology is obtained from online databases, including PubMed and the China National Knowledge Infrastructure (CNKI), among others. "Traditional Chinese medicine compound preparations", "single herb extracts", "active compounds", "NSCLC", "ferroptosis", and "mitophagy" were used as keywords when searching the databases. Consequently, pertinent articles published in recent years were collected and analyzed.

RESULTS

Given the complex etiology of NSCLC, treatment strategies that concentrate exclusively on ferroptosis or mitophagy often demonstrate limitations. In this regard, the utilization of herbal plants offers unique benefits in the management of NSCLC. The rationale can be summarized within the following two dimensions: Firstly, due to the molecular mechanisms of ferroptosis and mitophagy involving multiple signaling pathways (including PINK1/Parkin, HMGB1, system Xc-/GPX4/GSH, FSP1/CoQ10/NAD (P) H, and so on), sometimes drugs with a single target are difficult to involve multiple pathways. Fortunately, there is an expanding body of evidence suggesting that various herbaceous plants and their bioactive compounds can affect multiple biological targets. Moreover, these compounds seem to interact with several targets associated with ferroptosis and mitophagy in NSCLC (such as NIX, BNIP3, FUNDC1, GPX4, FSP1, P53, Nrf2, LncRNA, and so on). Secondly, Herbaceous plants and their bioactive compounds have been shown to possess a favorable safety profile, particularly with respect to reduced hepatotoxicity and nephrotoxicity in comparison to conventional Western medicine. For example, Numerous compound formulations, such as Fangji Huangqi decoction, Mufangji decoction, Qiyu Sanlong decoction, and Fuzheng Kangai decoction, have been employed in China for millennia, and their clinical efficacy appears to be quite promising. Notably, In recent years, numerous researchers have sought to isolate active constituents from clinically effective compound formulations through the application of chemical methodologies. This endeavor has been driven by the necessity to tackle challenges related to complex ingredient compositions and sophisticated processing. These active compounds have been employed in cellular and animal studies to elucidate the molecular mechanisms underlying these formulations.

CONCLUSIONS

The Asian region has a long-standing historical tradition of employing natural herbaceous plants for traditional medicinal purposes. Phytochemical and pharmacological studies have shown that various compound preparations derived from traditional Chinese medicine, along with individual herb extracts and their active constituents, display a range of bioactive effects. These effects encompass anti-tumor, anti-inflammatory, antibacterial, and antioxidant properties, among others. Numerous traditional compound formulations originating from China have emerged as promising candidates for the development of pharmacological agents targeting NSCLC. It is noteworthy that a variety of compound formulations aimed at the ferroptosis and mitophagy pathways, which demonstrate unique therapeutic effects on NSCLC, are presently under extensive investigation by an increasing number of researchers. Therefore, it is imperative to consider in vitro mechanistic studies, in vivo pharmacological evaluations, and assessments of clinical efficacy. Furthermore, it is essential to conduct a comprehensive assessment of plant resources, implement quality control measures, and engage in toxicological research to ensure that the data is appropriate for further examination.

Targeting ferroptosis: a novel pathway in oral, oropharyngeal, hypopharyngeal, and laryngeal cancers

Malignancies of the oral cavity, oropharynx, hypopharynx, and larynx rank as the seventh most prevalent cancers globally, characterized by high morbidity and mortality. Despite advancements in conventional therapies, these cancers often demonstrate recurrence and treatment resistance. This review investigates ferroptosis, an iron-dependent regulated cell death mechanism, as a novel therapeutic target to overcome resistance and recurrence in these cancers. A narrative review study was conducted using online databases, including PubMed, Google Scholar, Scopus, and Web of Science. The search incorporated keywords such as "ferroptosis", "oral squamous cell carcinoma", "oropharyngeal cancer", "hypopharyngeal cancer", "laryngeal cancer", "iron metabolism", and "lipid peroxidation". Studies focusing on molecular mechanisms, ferroptosis regulation, and therapeutic applications were included. Key findings highlighted the involvement of genes like CA9, CAV1, and SLC7 A11 in oral squamous cell carcinoma (OSCC), contributing to progression and resistance. Ferroptosis inducers such as resveratrol and quercetin effectively promoted ferroptosis in OSCC by targeting pathways like p53/SLC7 A11. In hypopharyngeal and oropharyngeal cancers, agents like ascorbic acid and RSL3 enhanced lipid peroxidation, while laryngeal cancers showed resistance through molecules like SLC3 A2 and KPNA2, which could be counteracted with targeted therapies. Nanotechnology-based approaches, including photodynamic therapy and nanofiber membranes, offer potential for localized and effective ferroptosis induction. Ferroptosis holds promise as a therapeutic strategy for treating head and neck cancers by addressing treatment resistance and recurrence. Future research should focus on optimizing combination therapies, understanding molecular heterogeneity, and translating preclinical findings into clinical applications to improve patient outcomes.

Crosstalk Between Sickle Cell Disease and Ferroptosis

Sickle cell disease (SCD) is an inherited hemoglobin disorder that is widespread across the globe. It is characterized by a very complex pathogenesis, but at the basis of the disease is the mutation of the HBB gene, which determines the production of a mutated hemoglobin: sickle cell hemoglobin (HbS). The polymerization of HbS, which occurs when the protein is in a deoxygenated state, and the greater fragility of sickle cell red blood cells (sRBCs) determine the release of iron, free heme, and HbS in the blood, favoring oxidative stress and the production of reactive oxygen species (ROS). These features are common to the features of a new model of cell death known as ferroptosis, which is characterized by the increase of iron and ROS concentrations and by the inhibition of glutathione peroxidase 4 (GPx4) and the System Xc-. In this context, this review aims to discuss the potential molecular and biochemical pathways of ferroptosis involved in SCD, aiming to highlight possible tags involved in treating the disease and inhibiting ferroptosis.

Ferroptosis driven by nanoparticles for tackling glioblastoma

Glioblastoma (GBM) is the most aggressive, malignant, and drug-resistant brain tumor. There are no effective treatment options for GBM, which usually leads to relapses that cause patients to die a few months later. Ferroptosis, a newly discovered mechanism of regulated cell death, has been identified as a tumor suppressor in solid tumors and represents an alternative to apoptosis resistance. This mechanism of cell death is characterized by iron overload, which is responsible for generating reactive oxygen species (ROS) in the cell. Understanding the ferroptosis pathway and its key regulators can be used to develop rational delivery systems that specifically target these regulators in GBM cells and promote cell death. This review conducted a systematic literature search to better understand the potential of ferroptosis as a target for developing nanoparticles to tackle GBM. The mechanisms of action, design parameters, efficacy, and safety concerns of 16 nanoparticles were evaluated, demonstrating the potential of combining ferroptosis inducers with nanocarriers to promote a selective delivery to the tumor microenvironment.