Iron homeostasis and ferroptosis in human diseases: mechanisms and therapeutic prospects

Protective effects and mechanisms of cynaroside on renal fibrosis in mice with unilateral ureteral obstruction

Renal fibrosis is a key factor in the progression of chronic kidney disease (CKD), and current treatments remain inadequate. In this study, we investigated the therapeutic effects of cynaroside (Cyn), a natural flavonoid, in a mouse model of renal fibrosis induced by unilateral ureteral obstruction. Cyn treatment significantly ameliorated tubular injury and interstitial fibrosis while improving renal function. Mechanistically, Cyn inhibited the expression of fibrosis-related proteins and suppressed Smad2/3 phosphorylation. Additionally, Cyn reduced myofibroblast accumulation by inhibiting epithelial-mesenchymal transition, as indicated by increased E-cadherin expression and decreased levels of mesenchymal markers. Cyn also reduced oxidative stress by downregulating the prooxidant enzyme NADPH oxidase 4 and restoring antioxidant enzymes. Furthermore, Cyn attenuated ferroptosis by regulating key proteins, including acyl-CoA synthetase long-chain family member 4, transferrin receptor 1, and glutathione peroxidase 4, while also restoring glutathione levels. Cyn alleviated endoplasmic reticulum stress, as evidenced by the downregulation of key markers such as glucose-regulated protein 78 and activating transcription factor 6, and reduced inflammation, as confirmed by decreased macrophage infiltration and lower cytokine production. Overall, Cyn demonstrated broad protective effects against renal fibrosis by modulating oxidative stress, ferroptosis, ER stress, and inflammation, positioning it as a potential therapeutic agent for CKD management.

p38γ modulates ferroptosis in brain injury caused by ethanol and cerebral ischemia/reperfusion by regulating the p53/SLC7A11 signaling pathway

Ischemic stroke, a neurological condition with a complicated etiology that is accompanied by severe inflammation and oxidative stress, and ethanol (EtOH) may aggravate ischemia/reperfusion (I/R)-induced brain damage. However, the effect of prolonged alcohol intake on acute brain injury remains ambiguous. As part of the mitogen-activated protein kinase (MAPK) family, p38γ is involved in ferroptosis and inflammation in various diseases. This study explored how p38γ is involved in the effects of chronic EtOH consumption and brain injury caused by cerebral I/R. Brain damage was induced in the mice via the administration of a liquid alcohol-containing diet for 8 weeks, middle cerebral artery occlusion reperfusion (MCAO/R), or a combination of both. We verified that EtOH significantly exacerbated MCAO/R-induced brain damage, ferroptosis and inflammation. Notably, p38γ levels were increased in experimental mouse and cell models. p38γ knockdown markedly attenuated brain tissue damage, oxidative stress, and inflammatory cell infiltration in EtOH + MCAO/R-treated mice. Mechanistic experiments revealed that p38γ may regulate inflammation and ferroptosis through the p53/SLC7A11 pathway. Overall, our experimental results indicate that p38γ is crucial for regulating EtOH- and I/R-induced brain damage by modulating the p53/SLC7A11 pathway.

Transcription factor KLF5 regulates MsrB1 to promote colorectal cancer progression by inhibiting ferroptosis through β-catenin

Methionine sulfoxide reductase B1 (MsrB1), a member of the selenoprotein family with a catalytic site containing a selenocysteine (Sec) residue, has been identified as an oncogene in colorectal cancer (CRC). However, the regulatory mechanisms of MsrB1 and the relationship between its oncogenic role and antioxidant capacity are not well understood. In this study, we show that either overexpression or suppression of MsrB1 in CRC cells leads to significant phenotypic changes, confirming its role in oncogenesis. To explore the molecular regulatory mechanisms of MsrB1, we used bioinformatic analyses to predict transcription factors within its promoter region, and validated these predictions using dual-luciferase reporter and chromatin immunoprecipitation (ChIP) assays. These assays revealed that Krüppel-like factor 5 (KLF5), acting as a transcription factor, binds to the MsrB1 promoter and activates it. Additionally, through Weighted Gene Co-expression Network Analysis (WGCNA) and Co-IP experimental validation, we identified β-catenin, a key component of the Wnt signaling pathway, as being co-expressed with MsrB1. The interaction between MsrB1 and β-catenin leads to the activation of GPX4 transcription, a known ferroptosis marker, which results in the inhibition of ferroptosis and promotion of oncogenesis in CRC. In conclusion, this study elucidates the transcriptional regulatory mechanism of MsrB1 and its role in inhibiting ferroptosis in conjunction with β-catenin. These findings suggest that MsrB1 may be a promising predictive biomarker and therapeutic target for CRC, extending its role beyond that of a conventional antioxidant selenoprotein.

Dracorhodin perochlorate sensitizes colorectal cancer to ferroptosis by activating HMOX1 and inhibiting the SLC7A11/GPX4 axis

BACKGROUND

Ferroptosis, an iron-dependent form of cell death mediated by lipid peroxidation, plays a critical role in tumor progression. The natural small molecule compound dracorhodin perchlorate (DP) exhibits antitumor activity, but its effects on colorectal cancer (CRC) and the underlying mechanisms remain unclear.

OBJECTIVE

This study aimed to elucidate the role and mechanism of DP in CRC development and ferroptosis promotion.

METHODS

Using RNA-Seq, molecular docking and molecular dynamics simulation, we observed ferroptosis levels and expression of HMOX1, SLC7A11, and GPX4 in CRC cells treated with DP. We also examined the impact of modulating HMOX1, SLC7A11, and GPX4 on DP-induced ferroptosis and antitumor effects.

RESULTS

DP inhibited various malignant behaviors of CRC cells and induced ferroptosis. Mechanistically, RNA-Seq, molecular dynamics simulations, and molecular docking studies have collectively confirmed that DP directly binds to the HO-1 molecule, thereby upregulating HO-1 expression and inducing iron overload. Additionally, DP downregulates the expression of SLC7A11 and GPX4, collectively promoting the occurrence of ferroptosis in CRC cells. The HO-1 inhibitor ZnPP and SLC7A11 overexpression significantly inhibited the antitumor activity and ferroptosis induced by DP. Hemin and ferroptosis inducers enhanced its therapeutic effectiveness. DP safely suppressed subcutaneous tumor growth and exhibited synergistic effects with cisplatin both in vitro and in vivo. HMOX1 knockdown weakened the ferroptosis induced by DP in CRC.

CONCLUSIONS

The findings strongly support the activation of HMOX1 by DP, downregulation of the SLC7A11/GSH/GPX4 axis, and induction of ferroptosis in CRC cells. DP inhibited CRC progression and acted synergistically when combined with cisplatin. Our research provides a scientific basis for the use of DP in the treatment of CRC and offers new insights into the application of traditional Chinese medicine in the fight against CRC.

Iron metabolism in rheumatic diseases

Iron is a crucial element for living organism in terms of oxygen transport, hematopoiesis, enzymatic activity, mitochondrial respiratory chain function and also immune system function. The human being has evolved a mechanism to regulate body iron. In some rheumatic diseases such as rheumatoid arthritis (RA), systemic lupus erythematous (SLE), systemic sclerosis (SSc), ankylosing spondylitis (AS), and gout, this balanced iron regulation is impaired. Altered iron homeostasis can contribute to disease progression through ROS production, fibrosis, inflammation, abnormal bone homeostasis, NETosis and cell senescence. In this review, we have focused on the iron metabolism in rheumatic disease and its role in disease progression.

GPX4 deficiency-induced ferroptosis drives endometrial epithelial fibrosis in polycystic ovary syndrome

The increased risk of infertility and endometrial lesions (such as endometrial hyperplasia or cancer) in polycystic ovary syndrome (PCOS) are closely associated with the lack of cyclical transformation in the endometrium. However, the underlying mechanisms remain incompletely understood. Though integrating single-cell RNA-sequencing, transcriptomics, and metabolomics analysis, we found that glutathione (GSH) metabolism disorder and the overactivation of ferroptosis, triggered by glutathione peroxidase 4 (GPX4) deficiency in endometrial epithelial cells, were the consequences of the prolonged endometrial proliferative phase in PCOS. This change may collectively contribute to some extent to decidualization failure. We further performed GSVA analysis and determined that the negative correlation between ferroptosis and fibrosis-related pathway was the most significant. Therefore, we first confirmed the presence of fibrosis in the proliferative endometrium of PCOS and PCOS-like mouse uteri. Additionally, by establishing endometrial organoids (EEOs) models and in vitro cell line models, we demonstrated that GPX4 deficiency contributed to extracellular matrix remodeling and excessive collagen deposition, via activating the TGF-β1/Smad2/3 pathway, which ultimately accelerated fibrosis. GSH intervention to the EEOs of PCOS could alleviate their fibrotic phenotypes at different stages. These findings may serve as a promising therapeutic target for PCOS-related endometrial dysfunction, as well as valuable strategies for improving PCOS-related adverse pregnancy outcomes.

Iron metabolism and ferroptosis in health and diseases: The crucial role of mitochondria in metabolically active tissues

Iron is essential in various physiological processes, but its accumulation leads to oxidative stress and cell damage, thus iron homeostasis has to be tightly regulated. Ferroptosis is an iron-dependent non-apoptotic regulated cell death characterized by iron overload and reactive oxygen species accumulation. Mitochondria are organelles playing a crucial role in iron metabolism and involved in ferroptosis. MitoNEET, a protein of mitochondrial outer membrane, is a key element in this process. Ferroptosis, altering iron levels in several metabolically active organs, is linked to several non-communicable diseases. For example, iron overload in the liver leads to hepatic fibrosis and cirrhosis, accelerating non-alcholic fatty liver diseases progression, in the muscle cells contributes to oxidative damage leading to sarcopenia, and in the brain is associated to neurodegeneration. The aim of this review is to investigate the intricate balance of iron regulation focusing on the role of mitochondria and oxidative stress, and analyzing the ferroptosis implications in health and disease.

Dexrazoxane Attenuates Blood-Brain Barrier Injury During Venoarterial Extracorporeal Membrane Oxygenation

Intracerebral hemorrhage during extracorporeal membrane oxygenation (ECMO) is one of the main causes of death and disability, with blood-brain barrier (BBB) disruption playing a key role. Dexrazoxane (DEX) is a Food and Drug Administration (FDA)-approved cardioprotective agent and iron chelator. The aim of this study was to investigate the effect of dexrazoxane on the BBB during venoarterial ECMO (VA ECMO). Rats were randomized into the control group (Con), the VA ECMO group, and the dexrazoxane combined with VA ECMO group (VA ECMO + DEX) (n = 6 per group). We observed brain injury and disruption of the BBB during VA ECMO. Compared with the VA ECMO group, dexrazoxane treatment mitigated brain injury, reduced pathological scores, decreased albumin leakage, and preserved tight junction protein expression. Combined with the assessment of brain tissue iron content, VA ECMO + DEX group had lower total iron, Fe2+ and ptgs2 levels than VA ECMO group. These findings suggest that dexrazoxane may attenuate BBB damage during VA ECMO by down-regulating iron deposition-induced ferroptosis.

Ferroptosis-activating metabolite acrolein antagonizes necroptosis and anti-cancer therapeutics

Dysregulated cell death leading to uncontrolled cell proliferation is a hallmark of cancer. Chemotherapy-induced cell death is critical for the success of cancer treatment but this process is impaired by metabolic byproducts. How these byproducts interfere with anti-cancer therapy is unclear. Here, we show that the metabolic byproduct acrolein derived from polyamines, tobacco smoke or fuel combustion, induces ferroptosis independently of ZBP1, while suppressing necroptosis in cancer cells by inhibiting the oligomerization of the necroptosis effector MLKL. Loss of the enzyme SAT1, which contributes to intracellular acrolein production, sensitizes cells to necroptosis. In mice, administration of an acrolein-trapping agent relieves necroptosis blockade and enhances the anti-tumor efficacy of the chemotherapeutic drug cyclophosphamide. Human patients with cancer coupled with a higher cell death activity but a lower expression of genes controlling polyamine metabolism exhibit improved survival. These findings highlight that the removal of metabolic byproducts improves the success of certain chemotherapies.

Protection of Framework Nucleic Acid Complexes via Regulating Ferroptosis on Myocardial Ischemia-Reperfusion Injury

The pathogenesis of myocardial ischemia-reperfusion injury (MIRI) is a complex process involving multiple pathophysiological mechanisms, including mitochondrial dysfunction, oxidative stress, and ferroptosis. Therefore, MIRI continues to pose a significant obstacle in cardiovascular therapy. Curcumin (Cur), a natural polyphenolic compound with potent antioxidant and antiferroptosis properties, has therapeutic potential but is poorly soluble, unstable, and has low bioavailability. To address these issues, a tetrahedral framework nucleic acid (tFNA) piggybacked Cur (tFNA-Cur) drug delivery system was designed to achieve efficient drug delivery and synergistically amplify the therapeutic effect by utilizing the programmable nanostructures, excellent safety profile, high biocompatibility, and intrinsic antioxidant activity of tFNA. In vitro studies demonstrated that tFNA-Cur could effectively mitigate oxidative stress-induced injury in H9C2 cardiomyocytes by restoring the redox balance and inhibiting ferroptosis. In a rat MIRI model, tFNA-Cur demonstrated significant efficacy, including reduced infarct size, decreased Fe2+ accumulation, and inhibited MDA production, a marker of lipid peroxidation. At the molecular level, tFNA-Cur enhanced the production of antioxidant proteins (GPX4, HO-1) by modulating the KEAP1-Nrf2 signaling axis, while inhibiting the overproduction of mitochondrial reactive oxygen species (ROS). This achieved a synergistic multitargeted and effective suppression of cardiomyocyte ferroptosis during the MIRI process. This study emphasizes the value of tFNA-Cur as a promising nanotherapeutic strategy in treating MIRI. It provides new ideas and research directions for combining nucleic acid nanomaterials with natural compounds to treat MIRI.

Cyanidin-3-O-glucoside mitigates Staphylococcus aureus-induced mastitis by suppressing inflammatory responses and Ferroptosis mediated by SESN2/Nrf2

Mastitis is a significant concern in both human and animal medicine. The causative agent S. aureus is one of the most challenging pathogens responsible for mastitis, and the rise of its antibiotic resistance underscores the need for alternative therapies. The SESN2/Nrf2 pathway, owing to its pivotal role in regulating cellular antioxidant defenses, which are critically disrupted during ferroptosis, has recently received less attention. However, whether C3G targets the SESN2/Nrf2 pathway remains unclear, which provides a dual mechanism for treating S. aureus-induced mastitis by reducing inflammation and safeguarding mammary epithelial cells (MECs) from ferroptosis. Using a mouse mastitis and MECs model, we investigated the therapeutic potential of C3G in alleviating S. aureus-induced mastitis, focusing specifically on its role in inhibiting inflammation and modulating ferroptosis through the SESN2/Nrf2 pathway. The results demonstrated the potential antimicrobial effects of C3G against S. aureus and MRSA, suppressed inflammatory responses by downregulating pro-inflammatory markers (IL-1β, IL-6, and TNF-α), and inhibited STAT2/STAT3 signaling. Furthermore, C3G modulates ferroptosis by activating the SESN2/Nrf2 pathway, reducing oxidative stress, and protecting mammary epithelial cells from ferroptosis-induced damage. This comprehensive approach highlights C3G's potential as a novel therapeutic strategy for managing mastitis, offering an effective alternative to antibiotics in addressing both bacterial infection and inflammation.

The safety assessment of cinnabar: Effects of co-administration with selenium on renal toxicity in mice

BACKGROUND

Cinnabar is a mercury-containing mineral traditionally used in Chinese medicine and can induce kidney injury via mercury toxicity. Given that cinnabar contains elements such as selenium, it is reasonable to hypothesize that its multi-element composition may regulate nephrotoxicity through intermetallic interactions. To validate this hypothesis and clarify the distinct renal toxicity between cinnabar and single mercury compounds, we compared the nephrotoxic effects of cinnabar, Zhu-Sha-An-Shen-Wan (ZSASW), mercuric sulfide (HgS), and mercuric nitrate (Hg(NO₃)₂). By co-administration with sodium selenite (Na₂SeO₃), this study related to the nephrotoxicity of cinnabar was improved from the perspective of metal-element interactions, which provided a new perspective for the safety assessment of mercury-containing medicines.

METHODS

Mice were gavaged with 0.5 % CMC-Na solution, cinnabar (50.0 and 200 mg/kg), HgS (50.0 mg/kg), Na2SeO3 (1.00 mg/kg), cinnabar (50.0 mg/kg)+Na2SeO3 (1.00 mg/kg), HgS (50.0 mg/kg)+Na2SeO3 (1.00 mg/kg), ZSASW (600 mg/kg), ZSASW (600 mg/kg)+Na2SeO3 (1.00 mg/kg) or Hg(NO3)2 (0.900 mg/kg in Hg2+) daily for 30 days. Renal histopathology was assessed by H&E staining. Related protein expression was measured by Western blotting. Renal total Hg (THg) concentration in kidney was determined by cold vapor atomic fluorescence spectroscopy.

RESULT

Western blotting revealed significantly decreased OAT1 and GPX4 levels in all experimental groups compared to the Control group (P < 0.05). NF-κB activation occurred in the Hg(NO₃)₂, Cinnabar-H, HgS, and HgS-Na₂SeO₃ groups. Hg(NO₃)₂ administration caused a significant decline in body weight growth rate (P < 0.001), severe renal tubular degeneration with epithelial cell swelling, and the highest renal THg concentration (773.77 % exceeding the Control group). Na₂SeO₃ alone induced inflammatory infiltration and tubular epithelial degeneration. The Cinnabar-H and HgS groups exhibited distinct renal damage (localized tubular degeneration and vascular hyaline degeneration, respectively) with elevated renal THg concentration (330.74 % and 347.95 % exceeding the Control group). The Cinnabar-L, Cinnabar-Na₂SeO₃, ZSASW, and ZSASW-Na₂SeO₃ groups maintained normal histology despite increased renal mercury content (227.46 %, 40.57 %, 67.2 %, and 556.56 % exceeding the Control group). Co-administration of Na₂SeO₃ with HgS restored OAT1 and GPX4 expression (P < 0.001), suppressed NF-κB activation, and minimally altered renal mercury accumulation (RSD=0.45 %). Na₂SeO₃ reduced mercury levels in the cinnabar-treated mice (57.07 % reduction) but increased accumulation in ZSASW-treated mice (292.65 % increase).

CONCLUSION

This study confirms that cinnabar and ZSASW exhibit lower toxicity than mercuric sulfide or mercuric nitrate. Multi-component synergistic or antagonistic effects need to be considered when studying the mechanism of action of cinnabar-related drugs.

Glucose deprivation-restoration induces labile iron overload and ferroptosis in renal tubules through V-ATPase-mTOR axis-mediated ferritinophagy and iron release by TPC2

Renal ischemia-reperfusion injury (IRI), a common complication following kidney transplantation and partial nephrectomy, is the leading cause of renal dysfunction with limited treatment. Excessive cellular iron accumulation drives lipid peroxidation and activates pathways associated with ferroptosis, which has been implicated in renal IRI. However, the regulatory mechanisms of cellular iron metabolism and its relationship with ferroptosis during ischemia-reperfusion (IR) remain unclear. In this study, in vitro OGSD-R (oxygen, glucose, and serum deprivation-restoration) models and in vivo IR models were employed to investigate alterations in iron metabolism, ferroptosis, and the underlying molecular mechanisms using immunofluorescence, immunoblotting and biochemical testing. We identified glucose deprivation-restoration (GD-R) as a key trigger of cellular iron overload under renal IR condition. Mechanistically, GD-R-induced iron overload is driven by the dysfunction of vacuolar ATPase (V-ATPase)-mammalian target of rapamycin (mTOR) pathway. Inactivation of mTOR results in lysosomal iron releases via two-pore channel 2 (TPC2) and ferritin degradation through ferritinophagy. This process elevates intracellular iron levels, thereby promoting ferroptosis in renal IRI. Targeting cellular iron metabolism effectively alleviates renal IRI. These findings highlight the critical role of glucose metabolism and V-ATPase-mTOR pathway in the regulation of iron homeostasis and ferroptosis during renal IRI, and establish a mechanistic link among glucose metabolism, iron overload and ferroptosis, providing potential therapeutic targets for renal IRI.

Ferroportin 1 depletion in neural stem cells promotes hippocampal neurogenesis and cognitive function in mice

In the adult brain, newborn granule cells continuously integrate into the hippocampal circuits, and fine-tuning the regulation of this process is crucial for improving hippocampal function. Iron is an essential element for the development and functionality of the brain. Ferroportin 1 (Fpn1) is an iron efflux transporter that plays a crucial role in regulating cellular iron release. In this study, Nestin-CreERT2-mediated Fpn1 conditional knockout (cKO) mice were established to investigate the impact of Fpn1 depletion in neural stem cells (NSCs) on adult hippocampal neurogenesis. Interestingly, we found that the cKO mice presented better learning and memory abilities and fewer anxiety-like behaviors. The numbers of self-renewing NSCs and NSCs undergoing proliferation and differentiation were significantly increased in the hippocampus of Fpn1 cKO mice, resulting in greater numbers of newborn neurons than in control mice. Further investigation revealed that the elevated iron levels in NSCs and iron-mediated increase in ROS generation in Fpn1 cKO mice contributed to the enhanced hippocampal neurogenesis through PI3K/Akt and MAPK signaling activation. Notably, iron supplementation promoted the proliferation of primary NSCs dose-dependently, whereas the presence of ROS inhibitor abolished this effect. This study reveals that Fpn1 of NSCs and its regulated iron levels are key modulators of hippocampal neurogenesis through promoting the proliferation of NSCs and ultimately controlling hippocampal function. These findings may provide valuable insights into stem cell-targeting treatments for neurological diseases.

Emerging Multifunctional Biomaterials for Addressing Drug Resistance in Cancer

Drug resistance remains a major barrier to effective cancer treatment, contributing to poor patient outcomes. Multifunctional biomaterials integrating electrical and catalytic properties offer a transformative strategy to target diverse resistance mechanisms. This review explores their ability to modulate cellular processes, remodel the tumor microenvironment (TME), and enhance drug delivery. Electrically active biomaterials enhance drug uptake and apoptotic sensitivity by altering membrane potentials, ion channels, and intracellular signaling, synergizing with chemotherapy. Catalytic biomaterials generate reactive oxygen species (ROS), activate prodrugs, reprogram hypoxic and acidic TME, and degrade the extracellular matrix (ECM) to improve drug penetration. Hybrid nanomaterials (e.g., conductive hydrogels, electrocatalytic nanoparticles), synergize electrical and catalytic properties for localized, stimuli-responsive therapy and targeted drug release, minimizing systemic toxicity. Despite challenges in biocompatibility and scalability, future integration with immunotherapy, personalized medicine, and intelligent self-adaptive systems capable of real-time tumor response promises to accelerate clinical translation. The development of these adaptive biomaterials, alongside advancements in nanotechnology and AI-driven platforms, represents the next frontier in precision oncology. This review highlights the potential of multifunctional biomaterials to revolutionize cancer therapy by addressing multidrug resistance at cellular, genetic, and microenvironmental levels, offering a roadmap to improve therapeutic outcomes and reshape oncology practice.

Hyaluronic acid-modified PtPdCo-CQ nanocatalyst with triple enzyme-like activities regulates macrophage polarization and autophagy levels for the treatment of rheumatoid arthritis

Rheumatoid arthritis (RA) is a chronic autoimmune disease characterized by synovial inflammation and imbalanced macrophage polarization. Pro-inflammatory M1 macrophages exacerbate joint damage through excessive production of reactive oxygen species (ROS), while anti-inflammatory M2 macrophages are prone to ferroptosis, limiting the long-term efficacy of existing nanozyme therapies. This study aimed to develop a novel nanocatalyst combining efficient ROS scavenging and M2 macrophage protection to synergistically regulate macrophage polarization and autophagy levels for sustained RA remission. We designed a hyaluronic acid-modified PtPdCo-CQ nanocatalyst (HPPCQ) with triple enzyme-like activities-superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD). In vitro experiments demonstrated that HPPCQ activated the Nrf2/HO-1 antioxidant pathway by scavenging ROS, promoted M1-to-M2 phenotypic repolarization, and protected M2 macrophages from autophagy-dependent ferroptosis via controlled release of chloroquine (CQ). In a collagen-induced arthritis (CIA) mouse model, HPPCQ targeted inflamed joints, significantly reducing clinical scores, synovial hyperplasia, and pro-inflammatory cytokine levels (TNF-α, IL-1β). Histological analysis revealed markedly alleviated cartilage destruction and inflammatory infiltration in HPPCQ-treated mice. By integrating ROS scavenging, macrophage reprogramming, and ferroptosis inhibition, this work provides a novel therapeutic strategy with enhanced efficacy and durability for RA treatment.

Bibliometric and graphical analysis of ferroptosis and aging research: Trends, gaps, and future directions

Over the past 12 years, a significant body of evidence derived from extensive research has underscored the pivotal involvement of ferroptosis in the mechanisms underlying aging. Despite the growing body of literature on this topic, there remains a paucity of analytical and descriptive studies that explore its trajectory, key research directions, current trends, primary focal points, and future outlooks. This research endeavors to provide an exhaustive overview of the advancements in understanding the relationship between ferroptosis and aging over the past 12 years. The dataset utilized in this study was extracted from the Web of Science, encompassing records from January 1, 2012, through June 19, 2024. We conducted comprehensive bibliometric and visual analyses using advanced analytical tools. The results highlight China's dominant contribution, which accounts for 48.52 % of total publications, positioning it as a key player in this research area. Leading institutions, including Columbia University, Southern Medical University, and the Salk Institute for Biological Studies, demonstrate high research productivity. Pamela Maher and Gu Wei are identified as the most prolific researchers in this field. Free Radical Biology and Medicine is the leading journal, publishing the most articles in this field. This study identifies mitochondrial diseases, arrhythmias, Parkinson's disease, hepatocellular carcinoma, and iron-refractory iron deficiency anemia as the key diseases investigated in this field. This bibliometric evaluation offers critical perspectives for both experienced scholars and early-career researchers, enabling the identification of novel ideas and advancements within this domain.

New developments in the role of ferroptosis in sepsis‑induced cardiomyopathy (Review)

Sepsis is a life‑threatening organ dysfunction disorder caused by dysfunctional host response to infection. Sepsis‑induced cardiomyopathy (SIC) is a common and serious complication of sepsis, and it is associated with increased mortality rates; however, its specific pathogenesis is still unclear. Ferroptosis, which is an iron‑dependent form of programmed cell death, is involved in the pathophysiology of SIC. Further study on the mechanism and therapeutic targets of ferroptosis in SIC may provide new strategies for clinical diagnosis and treatment of this condition. The present article reviews the mechanisms between SIC and ferroptosis, summarizes the progress in research of the involvement of ferroptosis in SIC and provides new potential strategies for further research and treatment in the future.

Neuroprotective effects of hirudin against cerebral ischemia-reperfusion injury via inhibition of CCL2-mediated ferroptosis and inflammatory pathways

Cerebral ischemia-reperfusion injury (CIRI) is a leading cause of neurological impairment in stroke, primarily correlated to oxidative stress, inflammation, and ferroptosis. This study investigates the neuroprotective effects of hirudin on CIRI, focusing on its role in modulating neuronal survival, oxidative stress, and ferroptosis markers through inhibition of CCL2. A middle cerebral artery occlusion (MCAO) model in mice and an oxygen-glucose deprivation/reoxygenation (OGD/R) model in HT22 cells were used to simulate ischemic conditions. Hirudin significantly improved neurological function and reduced cerebral edema and infarct size in the MCAO model. In vitro, hirudin enhanced neuronal viability and reduced apoptosis in OGD/R-stimulated cells. Integrative network pharmacology and transcriptomic analysis identified CCL2 as a potential target of hirudin. Hirudin treatment suppressed CCL2 expression, which in turn reduced the TLR4/NF-κB signaling activation, thereby mitigating ferroptosis and inflammatory responses in ischemic neurons. Overexpression of CCL2 partially reversed these protective effects, underscoring its role in ischemic injury. These findings suggest that hirudin alleviates CIRI by modulating CCL2 and preventing ferroptosis, offering insights into its potential as a therapeutic agent for ischemic conditions.

Electromagnetic fields regulate iron metabolism: From mechanisms to applications

BACKGROUND

Electromagnetic fields (EMFs), as a form of physical therapy, have been widely applied in biomedicine. Iron, the most abundant trace metal in living organisms, plays a critical role in various physiological processes, and imbalances in its metabolism are closely associated with the development and progression of numerous diseases. Numerous studies have demonstrated that EMF exposureinduces significant changes in both systemic and cellular iron metabolism.

AIM OF REVIEW

This review aims to summarize the evidence and potential biophysical mechanisms underlying the role of EMFs in regulating iron metabolism, thereby enhancing the understanding of their biological mechanisms and expanding their potential applications in biomedical fields.

KEY SCIENTIFIC CONCEPTS OF REVIEW

In this review, we have synthesized research findings and proposed the hypothesis that the biophysical mechanisms of EMFs regulate iron metabolism involve the special electromagnetic properties of iron-containing proteins and iron-enriched tissues, as well as the modulation of membrane structure and function, ion channels, and the generation and activity of Reactive Oxygen Species (ROS). Then, the review summarizes the latest advances in the effects of EMFs on iron metabolism and their safety, as well as their impact on immunoregulation, cardiovascular diseases, neurological diseases, orthopedic diseases, diabetes, liver injury, and cancer.

Phospholipids and peroxisomes in ferroptosis: the therapeutic target of acupuncture regulating vascular cognitive impairment and dementia

Ferroptosis, since its conceptualization in 2012, has witnessed an exponential growth in research interest over recent years. It is regulated by various cellular metabolic pathways during chronic cerebral ischemia and hypoxia, including reactive oxygen species (ROS) generation, iron accumulation, abnormalities in glutathione metabolism, and disruptions in lipid and glucose metabolism. With the deepening and widespread research, ferroptosis has emerged as a critical pathway in the pathogenesis of vascular cognitive impairment and dementia (VCID). This unique cell death pathway caused by iron-dependent phospholipid peroxidation is strongly related to VICD. We examine the impact of phospholipid composition on neuronal susceptibility to ferroptosis, with a particular focus on the critical role of polyunsaturated fatty acids (PUFAs) in this process. Intriguingly, peroxisomes, as key regulators of lipid metabolism and oxidative stress, influence the susceptibility of neuronal cells to ferroptosis through the synthesis of plasmalogens and other lipid species. In this Review, we provide a critical analysis of the current molecular mechanisms and regulatory networks of acupuncture for ferroptosis, the potential functions of acupuncture in peroxisomal functions and phospholipid metabolism, and its neuroprotective effects in VCID, together with a potential for therapeutic targeting. As such, this highlights the theoretical basis for the application of acupuncture in VCID through multi-target regulation of ferroptosis. This review underscores the potential of acupuncture as a non-pharmacological therapeutic approach in VCID, offering new insights into its role in modulating ferroptosis and associated metabolic pathways for neuroprotection.

Lipopolysaccharide-induced DNA damage response activates DNA-PKcs to drive actin cytoskeleton disruption and cardiac microvascular dysfunction in endotoxemia

Rationale: Sepsis-induced cardiomyopathy is characterized by microvascular injury, which is linked to lipopolysaccharide (LPS)-induced DNA damage response (DDR). This study investigates the role of DNA-PKcs, a key enzyme in the DDR pathway, in driving actin disruption and microvascular dysfunction following LPS exposure. Methods: We analyzed diverse transcriptomic datasets from septic human and murine models using bioinformatics tools to assess DDR pathway activation, correlations, and prognosis. In vivo, LPS-challenged mice were treated with inhibitors of DNA-PKcs or mitochondrial fission, and we evaluated cardiac function, microvascular integrity, mitochondrial status, and actin polymerization. Results: Bioinformatic analyses consistently revealed significant activation of the DDR pathway and upregulation of key genes across diverse septic models. Notably, elevated DDR pathway activity was significantly correlated with poor 28-day survival in human sepsis patients. Single-cell analysis localized this DDR gene upregulation predominantly to cardiac endothelial cells (ECs), fibroblasts, and macrophages during sepsis. Within septic capillary ECs, DDR pathway activity scores strongly correlated spatially and functionally with heightened mitochondrial fission and cytoskeletal remodeling pathway activities. In vivo experiments confirmed that LPS induced severe systolic and diastolic dysfunction, microvascular damage, and mitochondrial fragmentation, as well as significant actin depolymerization. Inhibition of DNA-PKcs with NU7441 markedly attenuated all these LPS-induced pathologies, improving cardiac function, preserving microvascular structure, preventing mitochondrial fragmentation, and normalizing related gene expression and actin cytoskeleton stability. Additionally, inhibiting mitochondrial fission with Mdivi-1 significantly ameliorated LPS-induced cardiac dysfunction and microvascular injury. Conclusions: Our findings suggest that LPS triggers a DNA-PKcs-dependent DDR that promotes mitochondrial fragmentation and actin disruption, particularly in cardiac ECs, contributing to sepsis-induced cardiomyopathy. Targeting DNA-PKcs or mitochondrial fission may hold therapeutic potential for the treatment of sepsis-induced cardiomyopathy.

Nuclear damage-induced DNA damage response coupled with IFI16-driven ECM remodeling underlies dilated cardiomyopathy

Rationale: Dilated cardiomyopathy (DCM) is a severe cardiac condition characterized by ventricular dilation and systolic dysfunction, often leading to heart failure. While the DNA damage response (DDR) pathway is increasingly implicated in DCM pathogenesis, the precise mechanisms linking DDR activation to specific pathological features like adverse extracellular matrix (ECM) remodeling and fibrosis remain poorly understood. Interferon-inducible protein 16 (IFI16), a known DNA sensor involved in DDR and inflammatory signaling, emerges as a potential mediator in this process. This study aimed to investigate the role of the DDR-IFI16 axis in DCM, specifically exploring its connection to ECM dysregulation and cardiac dysfunction, and to evaluate its potential as a therapeutic target. Methods: W This study integrated bioinformatics analyses of human cardiac transcriptomic datasets with experimental validation in a doxorubicin-induced murine DCM model. Cardiac function was assessed by echocardiography. Key molecular pathways were investigated using qPCR, ELISA, and enrichment analyses. Mechanistic roles were tested via pharmacological DDR inhibition in vivo and targeted IFI16 siRNA knockdown in vitro, followed by analysis of fibrosis, cell viability, and cytotoxicity markers. Results: Bioinformatic analyses consistently revealed activation of DDR and cytosolic DNA sensing pathways across human iPSC-CM models and ex vivo DCM heart tissue. WGCNA identified a key gene module strongly associated with DCM, co-enriched for DDR, DNA replication, and ECM/TGF-β signaling pathways. Single-cell RNA-seq analysis confirmed significant IFI16 upregulation in human DCM samples. High IFI16 expression strongly correlated with pathways governing 'Extracellular matrix organization' and key fibrotic genes. Experimental validation in the doxorubicin mouse model confirmed DDR activation. Crucially, in vivo treatment with the DDR inhibitor NU7441 significantly attenuated IFI16 upregulation, ameliorated cardiac dysfunction, and decreased cardiac fibrosis markers. Complementarily, in vitro knockdown of IFI16 significantly reduced pro-fibrotic markers, increased cell viability, and decreased cell injury. Conclusions: Our findings delineate a novel pathogenic axis in DCM where nuclear stress-induced DDR activation drives the upregulation of the DNA sensor IFI16. IFI16 acts as a critical mediator linking DDR signaling to pathological ECM remodeling and fibrosis. Pharmacological inhibition of the upstream DDR pathway effectively mitigates IFI16 induction, attenuates cardiac fibrosis, and improves cardiac function. This study identifies the DDR-IFI16-ECM remodeling axis as a crucial contributor to DCM pathogenesis and highlights its potential as a therapeutic target for mitigating adverse cardiac remodeling and dysfunction.

Ferroptosis-Like Death Induction in Saccharomyces cerevisiae by Gold Nanoparticles

Ferroptosis, a novel form of regulated cell death (RCD), has emerged as a promising therapeutic strategy for cancer treatment. While gold nanoparticles (AuNPs) are known to induce cell death and ferroptosis in combination with certain antibiotics, the mechanisms underlying ferroptosis in microorganisms remain poorly understood. This study aimed to investigate whether AuNPs induce ferroptosis-like cell death in the eukaryotic microbe Saccharomyces cerevisiae. Our findings revealed that AuNPs significantly reduced cell viability in S. cerevisiae, suggesting their ability to trigger cell death. Ferroptosis-related precursors, including intracellular iron overload and depletion of glutathione (GSH), were observed, leading to the inactivation of glutathione peroxidase (GPx). These changes were associated with the accumulation of reactive oxygen species (ROS) and lipid peroxidation, which amplified oxidative stress within the cells. Elevated ROS levels and lipid peroxidation further resulted in membrane rupture and the formation of 8-hydroxydeoxyguanosine, indicating DNA damage. Mitochondrial dysfunction, a hallmark of ferroptosis, was also evident. AuNP treatment caused mitochondrial membrane potential hyperpolarization and a reduction in mitochondrial membrane density. Unlike previously characterized forms of RCD, ferroptosis-like death in S. cerevisiae did not involve chromatin condensation, DNA fragmentation, or metacaspase activation. Finally, ferroptosis-like characteristics were confirmed using Liperfluo, a lipid ROS-specific probe. In conclusion, this study demonstrated that AuNPs can induce ferroptosis-like cell death in S. cerevisiae. These findings highlight the potential of AuNPs as antifungal agents and contribute to the broader understanding of ferroptosis in eukaryotic microbes.

The interplay of iron, oxidative stress, and α-synuclein in Parkinson's disease progression

The irreversible degeneration of dopamine neurons induced by α-synuclein (α-syn) aggregation in the substantia nigra is the central pathological feature of Parkinson's disease (PD). Neuroimaging and pathological autopsy studies consistently confirm significant iron accumulation in the brain of PD patients, suggesting a critical role for iron in disease progression. Current research has established that iron overload induces ferroptosis in dopaminergic neurons, evidence indicates that the impact of iron on PD pathology extends beyond ferroptosis. Iron also plays a regulatory role in modulating α-syn, affecting its aggregation, spatial conformation, post-translational modifications, and mRNA stability. Iron-induced α-syn aggregation can contribute to dopaminergic neurodegeneration through additional mechanisms, potentially creating a feedback loop in which α-syn further enhances iron accumulation, thus perpetuating a vicious cycle of neurotoxicity. Given α-syn's intrinsically disordered structure, targeting iron metabolism presents a promising therapeutic strategy for PD. Therefore, the development of iron chelators, alone or in combination with other therapeutic drugs, may offer a beneficial approach to alleviating PD symptoms and slowing disease progression.

Antioxidants in cancer therapy mitigating lipid peroxidation without compromising treatment through nanotechnology

BACKGROUND

Cancer treatments often exploit oxidative stress to selectively kill tumour cells by disrupting their lipid peroxidation membranes and inhibiting antioxidant enzymes. However, lipid peroxidation plays a dual role in cancer progression, acting as both a tumour promoter and a suppressor. Balancing oxidative stress through antioxidant therapy remains a challenge, as excessive antioxidant activity may compromise the efficacy of chemotherapy and radiotherapy.

AIM

This review explores the role of antioxidants in mitigating lipid peroxidation in cancer therapy while maintaining treatment efficacy. It highlights recent advancements in nanotechnology-based targeted antioxidant delivery to optimize therapeutic outcomes.

METHODS

A comprehensive literature review was conducted using reputable databases, including PubMed, Scopus, Web of Science, and ScienceDirect. The search focused on publications from the past five years (2020-2025), supplemented by relevant studies from earlier years. Keywords such as "antioxidants," "lipid peroxidation," "nanotechnology in cancer therapy," and "oxidative stress" were utilized. Relevant articles were critically analysed, and graphical illustrations were created.

RESULTS

Emerging evidence suggests that nanoparticles, including liposomes, polymeric nanoparticles, metal-organic frameworks, and others, can effectively encapsulate and control the release of antioxidants in tumour cells while minimizing systemic toxicity. Stimuli-responsive carriers with tumour-specific targeting mechanisms further enhance antioxidant delivery. Studies indicate that these strategies help preserve normal cells, mitigate oxidative stress-related damage, and improve treatment efficacy. However, challenges such as bioavailability, stability, and potential interactions with standard therapies remain.

CONCLUSION

Integrating nanotechnology with antioxidant-based interventions presents a promising approach for optimizing cancer therapy. Future research should focus on refining lipid peroxidation modulation strategies, assessing oxidative stress profiles during treatment, and employing biomarkers to determine optimal antioxidant dosing. A balanced approach to antioxidant use may enhance therapeutic efficacy while minimizing adverse effects.

Exploring Ferroptosis in Allergic Inflammatory Diseases: Emerging Mechanisms and Therapeutic Perspectives

Ferroptosis, a unique form of regulated cell death driven by iron accumulation and lipid peroxidation, has emerged as a critical process in various diseases. Recent evidence suggests its involvement in the pathogenesis of allergic diseases, including asthma, allergic rhinitis, and atopic dermatitis. These conditions are characterized by chronic inflammation, oxidative stress, and immune dysregulation, all of which intersect with the molecular mechanisms of ferroptosis. Key regulators, such as glutathione peroxidase 4 (GPX4), the cystine/glutamate antiporter system Xc-, and iron metabolism pathways, play pivotal roles in ferroptotic processes and their contribution to allergic disease progression. This review explores the mechanistic link between ferroptosis and allergic diseases, emphasizing how oxidative damage and iron overload exacerbate inflammation and tissue injury. We also highlight emerging diagnostic biomarkers, including lipid peroxidation products and iron regulators, which could improve disease monitoring and stratification. Therapeutic strategies targeting ferroptosis, such as GPX4 activators, iron chelators, and lipid peroxidation inhibitors, show promise in preclinical\ studies, offering potential new avenues for treating allergic diseases. However, challenges remain in translating these findings into clinical applications. By integrating current knowledge, this review underscores the need for further research into ferroptosis as both a biomarker and therapeutic target in allergic diseases.

Ferroptosis in Cancer: Mechanism and Therapeutic Potential

Cancer drug resistance occurs when cancer cells evade cell death following treatment with chemotherapy, radiation therapy, and targeted therapies. This resistance is often linked to the reprogramming of programmed cell death (PCD) pathways, allowing cancer cells to survive drug-induced stress. However, certain anticancer therapies, when combined with specific agents or inhibitors, can induce ferroptosis-a form of cell death driven by iron-dependent lipid peroxidation. Currently, extensive preclinical and clinical research is underway to investigate the molecular, cellular, and tissue-specific mechanisms underlying ferroptosis, with the goal of identifying strategies to overcome drug resistance in cancers unresponsive to conventional PCD pathways. By harnessing ferroptosis, cancer cells can be compelled to undergo lipid peroxidation-induced death, potentially improving therapeutic outcomes in patients with cancer. This short review aims to enhance the understanding of ferroptosis inducers in cancer therapy and stimulate further research into ferroptosis-based approaches for more effective clinical cancer treatment.

Metabolic Effects of the Cancer Metastasis Modulator MEMO1

Background/Objectives: Cancer cells often display altered energy metabolism. In particular, expression levels and activity of the tricarboxylic acid cycle (TCA cycle) enzymes may change in cancer, and dysregulation of the TCA cycle is a frequent hallmark of cancer cell metabolism. MEMO1, a modulator of cancer metastasis, has been shown to bind iron and regulate iron homeostasis in the cells. MEMO1 knockout changed mitochondrial morphology and iron content in breast cancer cells. Our previous genome-wide analysis of MEMO1 genetic interactions across multiple cancer cell lines revealed that gene sets involved in mitochondrial respiration and the TCA cycle are enriched among the gain-of-function interaction partners of MEMO1. Based on these findings, we measured the TCA cycle metabolite levels in breast cancer cells with varying levels of MEMO1 expression. Methods: ShRNA knockdown assay was performed to test essentiality of key TCA cycle enzymes. TCA metabolites were quantified using liquid chromatography-tandem mass spectrometry (LC-MS/MS) in MDA-MB-231 (high MEMO1), M67-2 (MEMO1 knockdown), and M67-9 (MEMO1 knockout) cells under iron-depleted, basal iron, and iron-supplemented conditions. Results:ACO2 and OGDH knockdowns inhibit cell proliferation, indicating an essential role of the TCA cycle in MDA-MB-231 metabolism. α-Ketoglutarate and citrate levels exhibited an inverse relationship with MEMO1 expression, increasing significantly in MEMO1 knockout cells regardless of iron availability. In contrast, fumarate, malate, and glutamate levels were elevated in MEMO1 knockout cells specifically under low iron conditions, suggesting an iron-dependent effect. Conclusions: Overall, our results indicate that MEMO1 plays a role in regulating the TCA in cancer cells in an iron-dependent manner.

The interplay between the myeloperoxidase-hypochlorous acid system, heme oxygenase, and free iron in inflammatory diseases

Accumulated unbound free iron (Fe(II or III)) is a redox engine generating reactive oxygen species (ROS) that promote oxidative stress and inflammation. Iron is implicated in diseases with free radical pathology including cardiovascular, neurodegenerative, reproductive disorders, and some types of cancer. While many studies focus on iron overload disorders, few explore the potential link between the myeloperoxidase-hypochlorous acid (MPO-HOCl) system and localized iron accumulation through heme and iron‑sulfur (FeS) cluster protein destruction. Although inducible heme oxygenase (HO-1), the rate-limiting enzyme in heme catabolism, is frequently associated with these diseases, we hypothesize that HOCl also contributes to the generation of free iron and heme degradation products. Furthermore, HO-1 and HOCl may play a dual role in free iron accumulation by regulating the activity of key iron metabolism proteins. Enzymatic and non-enzymatic modulators, as well as scavengers of HOCl, can help prevent heme destruction and reduce the accumulation of free iron. Given iron's role in disease progression and severity, identifying the primary sources, mechanisms, and mediators involved in free iron generation is crucial for developing effective pharmacological treatments. Further investigation focusing on the specific contributions of the MPO-HOCl system and free iron is necessary to explore novel strategies to mitigate its harmful effects in biological systems.

Unraveling cell death mechanisms in traumatic brain injury: dynamic roles of ferroptosis and necroptosis

Traumatic brain injury (TBI) remains a major cause of mortality and long-term disability worldwide, with ferroptosis and necroptosis emerging as key drivers of secondary neuronal damage. Ferroptosis, characterized by iron-dependent lipid peroxidation and mitochondrial dysfunction, exacerbates oxidative stress and neuronal cell death. In parallel, necroptosis, mediated by receptor-interacting protein kinases (RIPK1 and RIPK3), amplifies inflammation through membrane rupture and the release of cellular components. Mitochondrial dynamics, involving fission and fusion processes, play a dual role in regulating these pathways. While mitochondrial fusion preserves cellular integrity and reduces oxidative stress, excessive mitochondrial fission driven by dynamin-related protein 1 (DRP1) accelerates necroptotic signaling and neuronal injury. This intricate interplay between ferroptosis, necroptosis, and mitochondrial dynamics highlights potential therapeutic targets. Modulating these pathways through tailored interventions could reduce neuronal damage, mitigate neuroinflammation, and improve functional outcomes in TBI patients. Advancing our understanding of these mechanisms is essential for developing precision therapies that address the complex pathology of traumatic brain injury.

Iron Homeostasis-Regulated Adaptive Metabolism of PEGylated Ultrasmall Iron Oxide Nanoparticles

Iron oxide nanoparticles have become increasingly significant in the biomedical field due to their exceptional magnetic properties and biocompatibility. However, understanding their in vivo metabolism and transformation is crucial due to the potential biological effects they may induce. This study investigates the metabolic pathways of PEGylated ultrasmall iron oxide nanoparticles (PUSIONPs) in vivo, particularly under varying iron statuses and dosages. Employing a comprehensive analytical approach─including magnetic resonance imaging, elemental analysis, histological assessments, hematological analysis, and Western blot analysis─the biodistribution and transformation of PUSIONPs were mapped. The findings reveal significant differences in the metabolic fate of PUSIONPs between iron-sufficient and iron-deficient conditions, underscoring the pivotal role of iron homeostasis in regulating PUSIONPs biodegradation. In iron-deficient states, degradation and transformation were markedly accelerated, with the released iron rapidly incorporated into hemoglobin. Additionally, the liver and spleen exhibited different PUSIONPs metabolism rates due to their distinct physiological roles: the spleen, primarily responsible for iron recycling, facilitated faster degradation, while the liver, serving as an iron storage organ, showed slower degradation. Under iron deficiency, most degradation products were directed toward hemoglobin synthesis, whereas under normal conditions, the liver gradually metabolized the degradation products, and the spleen retained higher iron levels. Moreover, PUSIONPs degradation demonstrated dose dependency, with higher doses slowing degradation and reducing the utilization rate by the iron-deficient body. Comprehensive safety evaluations confirmed that PUSIONPs exhibit excellent biocompatibility across all doses, with no significant safety concerns. Compared to the clinically used intravenous iron supplement iron sucrose, PUSIONPs also demonstrated superior bioavailability and more effective iron supplementation. These findings provide critical insights into the interaction between iron oxide nanoparticles and iron metabolism, offering a foundation for future research and the broader application of PUSIONPs in biomedical contexts.

Constitutive Hepatic mTORC1 Activation Aggravates Alcohol-Induced Liver Injury via Endoplasmic Reticulum Stress-Mediated Ferroptosis

Alcohol-related liver disease (ALD), a consequence of excessive alcohol use, manifests across a broad spectrum of liver damage, ranging from steatosis to cirrhosis. DEPDC5 (DEP domain-containing protein 5) is a component of the GATOR1 (gap activity towards rags 1) complex, which functions as a repressor of the amino acid-sensing branch of the mammalian target of rapamycin complex 1 (mTORC1) pathway. In this study, hepatocyte-specific Depdc5 knockout mice (Depdc5△Hep) were generated, and it was found that aberrant activation of mTORC1 caused by Depdc5 deletion led to exacerbated endoplasmic reticulum (ER) stress and hepatocyte ferroptosis in the livers of ethanol-fed mice. Torin-1, an ATP-competitive mTOR inhibitor, suppressed the mTORC1 activity and reversed the effects of Depdc5 deletion on ER stress and ferroptosis in ethanol-fed mouse livers. Furthermore, pharmacologic relief of ER stress using tauroursodeoxycholic acid or inhibition of ferroptosis with liproxstatin-1 both alleviated the liver abnormalities induced by Depdc5 ablation in ethanol-fed mice. In addition, the research uncovered that ER stress functions as an upstream signal of ferroptosis in the progression of ALD. These findings provide novel in vivo evidence that sustained mTORC1 activation leads to alcoholic liver injury by inducing ER stress and ferroptosis, suggesting that targeting these pathways may represent a potential therapeutic strategy for ALD.

Molecular mechanisms of alcohol-associated liver disease-ferroptosis and autophagy crosstalk

Alcohol-associated liver disease (ALD) is a chronic liver injury caused by prolonged heavy drinking and its pathogenesis is extremely complex. According to current researches, ethanol metabolism and the generation of some of its related metabolites, including acetaldehyde and reactive oxygen species, are significant contributors to hepatocyte toxicity. These substances-induced lipid metabolism disorders, inflammatory response, mitochondrial damage, and cellular oxidative stress are important factors that lead to liver injury. Ethanol has been shown in numerous studies to exacerbate ALD by disrupting autophagy via a variety of mechanisms. ALD can be somewhat alleviated by activating autophagy, which plays a significant role in the development of ALD by removing accumulated protein polymers, damaged mitochondria, and excess lipid droplets from hepatocytes. Furthermore, persistent alcohol use raises serum iron levels, which in turn causes hepatocytes to absorb more iron. This, in turn, encourages iron loading in the liver's and other organs' parenchymal and nonparenchymal cells, finally resulting in ferroptosis. Both ferroptosis and autophagy are significant types of controlled cell death, and new research has revealed that cellular autophagy and a variety of signaling pathways play a key role in the initiation and progression of ferroptosis. Alcohol and iron both have the ability to cause oxidative stress on their own, thus their combined effects hasten liver damage. Iron loading, on the other hand, accelerates the development of ALD by triggering mitochondrial oxidative stress and activating signaling pathways and proteins linked to Ferritinophagy. Thus, we think that a new approach to treating ALD in the future will involve examining the interaction between ferroptosis and mitochondrial autophagy based on iron overload.

Bimetallic NiCu-MOF Protects DOX-Induced Myocardial Injury and Cardiac Dysfunction by Suppressing Ferroptosis and Inflammation

Doxorubicin (DOX), a potent anthracycline chemotherapeutic agent, is widely used in cancer treatment but is associated with significant adverse effects, particularly DOX-induced cardiomyopathy (DIC). DIC pathogenesis involves the generation of reactive oxygen species (ROS) and ferroptosis induction. Novel therapeutic strategies targeting antioxidant defenses and ferroptosis inhibition are essential for mitigating DIC. An innovative bimetallic metal-organic framework (MOF), NiCu-MOF (NCM), is developed, exhibiting multifaceted antioxidant enzyme-mimicking activities that effectively scavenge a broad spectrum of ROS. Additionally, the bimetallic NCM exhibits excellent iron-chelating ability. In vitro experiments demonstrate that NCM significantly reduces cardiomyocyte death by attenuating ROS levels and inhibiting ferroptosis. Furthermore, in a mouse model of DIC, NCM treatment results in substantial myocardial protection, evidenced by improved cardiac function and structural integrity. This protective effect is attributed to suppression of ferroptosis, preservation of mitochondrial function, and attenuation of inflammatory responses. Collectively, these findings highlight biocompatible NCM's potential as a novel cardioprotective agent and offer a promising therapeutic strategy for managing DIC.

Synergistic photoinduction of ferroptosis and apoptosis by a mitochondria-targeted iridium complex for bladder cancer therapy

Bladder cancer (BC) is one of the most common malignant tumors of the urinary system, and has a high recurrence rate and treatment resistance. Recent results indicate that mitochondrial metabolism influences the therapeutic outcomes of BC. Mitochondria-targeted photosensitizer (PS) is a promising anticancer therapeutic approach that may overcome the limitations of conventional BC treatments. Herein, two mitochondria-targeted iridium(III) PSs, Ir-Mito1 and Ir-Mito2, have been designed for BC treatment. Mechanically, Ir-Mito2 induced a decrease in mitochondrial membrane potential via white light activation, further triggering a reduction of the B-cell lymphoma 2 protein (Bcl-2)/Bcl-associated X protein (Bax) ratio and increment of cleaved caspase3. Meanwhile, the reduction of glutathione, deactivation of glutathione peroxidase 4 (GPX4), increase of acyl-CoA synthetase long chain family member 4 (ACSL4), and accumulation of lipid peroxide resulted in synergistically activating of ferroptosis and apoptosis. The results demonstrated that Ir-Mito2 exhibited excellent antitumor efficacy with superior biosafety in vivo. This work on light-activated and mitochondrial-targeted PS provides an innovative therapeutic platform for BC.

Melatonin protects against cadmium-induced endoplasmic reticulum stress and ferroptosis through activating Nrf2/HO-1 signaling pathway in mice lung

Cadmium (Cd) is a prevalent heavy metal pollutant known to cause lung damage. However, the mechanisms underlying Cd-induced lung injury and the associated therapeutic strategies remain unclear. By establishing Cd-induced lung damage models both in vivo and in vitro, we observed that Cd inhibited the Nrf2/HO-1 signaling pathway, disrupted the redox balance in lung tissue, accelerated endoplasmic reticulum (ER) stress, and promoted ferroptosis, ultimately leading to lung injury. Melatonin (Mel), a potent reactive oxygen species (ROS) inhibitor with high antioxidative efficacy, mitigated the increasing in ROS and the decreasing in superoxide dismutase levels induced by Cd, as well as the upregulation of PERK-eIF2α-ATF4 signaling associated with ER stress, through the activation of the Nrf2/HO-1 signaling pathway. Furthermore, Mel administration not only prevented Cd-induced iron overload but also reduced lipid peroxidation levels, thereby improving mitochondrial morphological alterations. Collectively, our results demonstrated that Mel treatment alleviated Cd-induced lung injury by inhibiting oxidative stress, which in turn ameliorated ER stress and ferroptosis through the activation of the Nrf2/HO-1 pathway.

A transcriptomic analysis of the interplay of ferroptosis and immune filtration in endometriosis and identification of novel therapeutic targets

Endometriosis is an inflammatory disease, involving immune cell infiltration and production of inflammatory mediators. Ferroptosis has recently been recognized as a mode of controlled cell death and the iron overload and peroxidative environment prevailing in the ectopic endometrium facilitates the occurrence of ferroptosis. In the current investigation, gene expression data was obtained from the dataset GSE7305.The variation in infiltration of immune cells amongst the samples with endometriosis and normal tissue was analysed using the CIBERSORTx tool which revealed higher infiltration of T cells gamma delta, macrophages M2, B cells naïve, T cells CD4 memory resting cells, plasma cells, T cells CD8 and mast cells activated in the tissue samples with endometriosis. An overlap of the differentially expressed genes (DEGs) and ferroptosis related genes revealed 32 ferroptosis related DEGs (FR-DEGs). GO and KEGG pathway analysis showed the FR-DEGs to be enriched in ferroptosis. The PPI network of the FR-DEGs was constructed and TP53, HMOX1, CAV1, CDKN1A, CD44, EPAS1, SLC2A1, MAP3K5, GCLC and FANCD2 were identified as the hub genes. Pearson correlation revealed significant correlation between the hub genes and infiltrating immune cells in endometriosis, thereby suggesting existence of a regulatory crosstalk between immune responses and ferroptosis in endometriosis. Hub gene- miRNA network analysis revealed that 7 of the 10 hub genes were targets of 3 miRNAs -hsa-miR-20a-5p, hsa-miR-16-5p and hsa-miR-17-5p, thereby providing further insight into the regulatory mechanisms underlying disease progression. Predictive analysis and cross validation studies revealed TP53 and CDKN1A as common targets of hsa-miR-16-5p, hsa-miR-17-5p, and hsa-miR-20a-5p, thereby revealing their regulatory roles in ferroptosis and immune modulatory pathways relevant to endometriosis. The present study indicates an important role of both immune dysregulation and ferroptosis in the pathogenesis of endometriosis and identifies ferroptosis related hub genes and their miRNA regulators as favourable novel targets for further studies and therapeutic interventions.

Oxidative Stress and Redox Imbalance: Common Mechanisms in Cancer Stem Cells and Neurodegenerative Diseases

Oxidative stress (OS) is an established hallmark of cancer and neurodegenerative disorders (NDDs), which contributes to genomic instability and neuronal loss. This review explores the contrasting role of OS in cancer stem cells (CSCs) and NDDs. Elevated levels of reactive oxygen species (ROS) contribute to genomic instability and promote tumor initiation and progression in CSCs, while in NDDs such as Alzheimer's and Parkinson's disease, OS accelerates neuronal death and impairs cellular repair mechanisms. Both scenarios involve disruption of the delicate balance between pro-oxidant and antioxidant systems, which leads to chronic oxidative stress. Notably, CSCs and neurons display alterations in redox-sensitive signaling pathways, including Nrf2 and NF-κB, which influence cell survival, proliferation, and differentiation. Mitochondrial dynamics further illustrate these differences: enhanced function in CSCs supports adaptability and survival, whereas impairments in neurons heighten vulnerability. Understanding these common mechanisms of OS-induced redox imbalance may provide insights for developing interventions, addressing aging hallmarks, and potentially mitigating or preventing both cancer and NDDs.

Lactoferrin-A Regulator of Iron Homeostasis and Its Implications in Cancer

Cancer is a global health challenge, and its development is closely linked to iron metabolism. Cancer cells have an increased demand for this element, which promotes their proliferation, invasion, and metastasis. Excess iron catalyzes the formation of reactive oxygen species (ROS), which can both induce ferroptosis and initiate oncogenic signaling pathways. The deregulation of iron metabolism in cancer patients leads to anemia or toxic iron overload and also affects the gut microbiota. Lactoferrin (LF), a glycoprotein with strong iron chelating properties, can regulate its availability to cancer cells, thereby limiting their growth and progression. By chelating free Fe ions, LF reduces oxidative stress and inhibits the mechanisms that promote carcinogenesis. Additionally, it exhibits immunomodulatory and anti-inflammatory effects and may enhance the body's anti-tumor response. This review analyses the mechanisms of action of lactoferrin in the context of cancer, with a particular focus on its chelating, antioxidant, and immunomodulatory properties. The multidirectional effects of LF make it a promising component of preventive and therapeutic strategies, requiring further clinical studies.

Hyperglycemia-induced DNA damage response activates DNA-PK complex to promote endothelial ferroptosis in type 2 diabetic cardiomyopathy

Rationale: Hyperglycemia-induced endothelial dysfunction is a hallmark of diabetic cardiomyopathy, yet the underlying molecular mechanisms remain incompletely understood. This study aimed to investigate how the DNA damage response (DDR) pathway regulates endothelial cell ferroptosis under hyperglycemic conditions, potentially revealing new therapeutic targets for mitigating cardiac damage in type 2 diabetes mellitus (T2DM). Methods: We performed an integrated analysis of publicly available RNA sequencing datasets (GSE280770, GSE89475, GSE161931, CRA007245) to evaluate the role of DDR in hyperglycemia-induced endothelial dysfunction in vitro and in vivo, including in a T2DM mouse model. Key DDR and ferroptosis markers were validated in cardiac microvascular endothelial cells (CMECs) isolated from mice with streptozotocin (STZ)/high-fat diet (HFD)-induced T2DM, with and without treatment with the DNA-PK inhibitors NU7441 or M9831. Results: Hyperglycemia induced a robust DDR in endothelial cells, characterized by the upregulation of DNA-PK complex genes (PRKDC, XRCC5, XRCC6) and increased markers of DNA damage (γH2AX, 8-oxo-dG). This was accompanied by increased expression of pro-ferroptotic genes (Tfrc, Acsl4, Ptgs2), decreased expression of anti-ferroptotic genes (Gpx4, Slc7a11), and elevated lipid peroxidation (MDA, 4-HNE). Pharmacological inhibition of DNA-PK mitigated these effects, reducing oxidative stress, lipid peroxidation, and endothelial permeability, while improving cardiac contractile and relaxation parameters. Conclusions: Our findings implicate the DNA-PK complex as a key regulator of hyperglycemia-induced endothelial ferroptosis in T2DM cardiomyopathy. Targeting DNA-PK complex may represent a novel therapeutic strategy for mitigating microvascular dysfunction and cardiac decline in T2DM.

From death to birth: how osteocyte death promotes osteoclast formation

Bone remodeling is a dynamic and continuous process involving three components: bone formation mediated by osteoblasts, bone resorption mediated by osteoclasts, and bone formation-resorption balancing regulated by osteocytes. Excessive osteocyte death is found in various bone diseases, such as postmenopausal osteoporosis (PMOP), and osteoclasts are found increased and activated at osteocyte death sites. Currently, apart from apoptosis and necrosis as previously established, more forms of cell death are reported, including necroptosis, ferroptosis and pyroptosis. These forms of cell death play important role in the development of inflammatory diseases and bone diseases. Increasing studies have revealed that various forms of osteocyte death promote osteoclast formation via different mechanism, including actively secreting pro-inflammatory and pro-osteoclastogenic cytokines, such as tumor necrosis factor alpha (TNF-α) and receptor activator of nuclear factor-kappa B ligand (RANKL), or passively releasing pro-inflammatory damage associated molecule patterns (DAMPs), such as high mobility group box 1 (HMGB1). This review summarizes the established and potential mechanisms by which various forms of osteocyte death regulate osteoclast formation, aiming to provide better understanding of bone disease development and therapeutic target.

Oxidative Stress Biomarkers Predict Myocardial Dysfunction in a Chemotherapy-Induced Rat Model

Objectives: Chemotherapy improves survival in breast cancer patients but increases the risk of myocardial dysfunction and heart failure. Since early prediction of cardiomyopathy remains difficult, biomarkers are needed for detecting myocardial damage before heart failure develops. This study examines the association between oxidative stress biomarkers and myocardial dysfunction in a chemotherapy-induced rat model. Methods: Forty-two rats were randomized into four groups: control (n = 7), doxorubicin only (n = 7), doxorubicin plus trastuzumab (n = 7), and doxorubicin plus trastuzumab with cardioprotective intervention (n = 21). Doxorubicin and trastuzumab were administered sequentially over 28 days. Echocardiography with speckle-tracking was utilized to measure longitudinal strain (LS, -%). Reduced LS was defined by a LS with a median value less than 23% on day 28. Blood samples were collected for biomarker analysis, focusing on superoxide dismutase (SOD) and glutathione (GSH). Myocardium fibrosis was assessed using Masson's trichrome staining. Results: Thirty-four rats survived and underwent LS analysis. All rats treated with doxorubicin and trastuzumab exhibited reduced LS, while those receiving cardioprotective intervention maintained preserved LS on day 28. The reduced LS group had significantly lower SOD and higher GSH levels compared to the preserved LS group. SOD and GSH correlated strongly with LS (SOD, r = 0.590, p = 0.001; GSH, r = -0.590, p = 0.003), and LS correlated with fibrosis area (r = -0.660, p < 0.001). SOD and GSH effectively predicted reduced LS. Conclusions: In a rat model of chemotherapy-induced cardiomyopathy, oxidative stress biomarkers correlated with myocardial dysfunction, as indicated by LS. These findings highlight the potential of biomarker monitoring to improve early detection and prevention strategies for chemotherapy-induced cardiomyopathy.

Ferroptosis in adipose tissue: A promising pathway for treating obesity?

Using a high-fat-diet (HFD) mouse model and clinical samples, Wang et al.1 in this issue of Cell Metabolism report that ferroptotic signaling is involved in the expansion of adipose tissue and promotes adaptive thermogenesis in beige adipocytes. This finding may represent a promising new avenue for treating obesity.

Examining the prognostic and clinicopathological significance of GPX4 in human cancers: a meta-analysis

Elevated levels of the enzyme GPX4 have been detected in tumor tissues, which may play a role in cancer progression. We did a meta-analysis of eight studies encompassing 1180 individuals to evaluate the importance of GPX4 in cancer, particularly in terms of prognosis and clinicopathological characteristics. Research results indicate that higher levels of GPX4 were linked to worse overall survival (OS) (HR = 1.47 [95%CI = 1.18-1.76], p < .001). Elevated levels of GPX4 were linked to lymph node invasion (OR.69 [95% CI.44-1.10], p =.12), metastasis (OR 1.58 [95% CI.97-2.55], p =.06, p <.0001), and advanced clinical stage III-IV (OR.82 [95% CI.70-.96], p =.001). A sensitivity study revealed that the general findings were constant across all levels of impact intensity. The findings of this meta-analysis suggest that increased GPX4 levels are not only correlated with reduced overall survival rates for patients with tumors but it also offers valuable insights regarding the clinical traits of tumor malignancy and metastasis. Based on these connections, GPX4 has the potential to serve as a biomarker for tumor detection, prognosis, and targeted therapy.

Nuclear receptor 4A1 facilitates complete Freund's adjuvant-induced inflammatory pain in rats by promoting ferroptosis in spinal glial cells

Glial cell-induced neuroinflammation in the spinal cord is the critical pathology underlying complete Freund's adjuvant (CFA)-induced inflammatory pain. Previously, we showed that spinal glial cells undergo ferroptosis after CFA injection, which may contribute to the development of neuroinflammation and inflammatory pain. However, the mechanism underlying the occurrence of ferroptosis during inflammatory pain remains unclear. The aim of this study was to investigate the molecular factors involved in the occurrence of ferroptosis during the development of inflammatory pain. Bulk and single-cell RNA sequencing were performed to identify the key genes involved in the ferroptosis of spinal astrocytes, microglia, and oligodendrocytes in rats. We identified nuclear receptor 4A1 (NR4A1) as a common ferroptosis-related gene present in all three types of glial cells. Western blotting and immunostaining revealed increased NR4A1 levels in the spinal glial cells of the CFA-treated rats. Moreover, intrathecal injection of DIM-C-pPhOH (an NR4A1 inhibitor) effectively alleviated mechanical and thermal hypersensitivity in the CFA-treated rats by attenuating ferroptosis and neuroinflammation in spinal glial cells. Proteomic analysis revealed that mitogen-activated protein kinase 3 (MAPK3) may be the target protein of NR4A1. In addition, the combined results of chromatin immunoprecipitation and dual-luciferase assays indicated that NR4A1 can bind to the promoter region and promote transcription of MAPK3, ultimately leading to lipid peroxidation. In conclusion, this study demonstrated that increased expression of NR4A1 promotes the progression of CFA-induced inflammatory pain by enhancing ferroptosis through the transcriptional activation of MAPK3 and subsequent lipid peroxidation. Furthermore, inhibition of NR4A1 was found to suppress ferroptosis and reduce the release of pro-inflammatory cytokines in the spinal cord of rats with inflammatory pain. Collectively, these findings outline a novel pathological mechanism and identify potential therapeutic targets for the treatment of inflammatory pain.

Iron homeostasis and ferroptosis in muscle diseases and disorders: mechanisms and therapeutic prospects

The muscular system plays a critical role in the human body by governing skeletal movement, cardiovascular function, and the activities of digestive organs. Additionally, muscle tissues serve an endocrine function by secreting myogenic cytokines, thereby regulating metabolism throughout the entire body. Maintaining muscle function requires iron homeostasis. Recent studies suggest that disruptions in iron metabolism and ferroptosis, a form of iron-dependent cell death, are essential contributors to the progression of a wide range of muscle diseases and disorders, including sarcopenia, cardiomyopathy, and amyotrophic lateral sclerosis. Thus, a comprehensive overview of the mechanisms regulating iron metabolism and ferroptosis in these conditions is crucial for identifying potential therapeutic targets and developing new strategies for disease treatment and/or prevention. This review aims to summarize recent advances in understanding the molecular mechanisms underlying ferroptosis in the context of muscle injury, as well as associated muscle diseases and disorders. Moreover, we discuss potential targets within the ferroptosis pathway and possible strategies for managing muscle disorders. Finally, we shed new light on current limitations and future prospects for therapeutic interventions targeting ferroptosis.

Molecular Mechanisms Underlying Heart Failure and Their Therapeutic Potential

Heart failure (HF) is a prominent fatal cardiovascular disorder afflicting 3.4% of the adult population despite the advancement of treatment options. Therefore, a better understanding of the pathogenesis of HF is essential for exploring novel therapeutic strategies. Hypertrophy and fibrosis are significant characteristics of pathological cardiac remodeling, contributing to HF. The mechanisms involved in the development of cardiac remodeling and consequent HF are multifactorial, and in this review, the key underlying mechanisms are discussed. These have been divided into the following categories thusly: (i) mitochondrial dysfunction, including defective dynamics, energy production, and oxidative stress; (ii) cardiac lipotoxicity; (iii) maladaptive endoplasmic reticulum (ER) stress; (iv) impaired autophagy; (v) cardiac inflammatory responses; (vi) programmed cell death, including apoptosis, pyroptosis, and ferroptosis; (vii) endothelial dysfunction; and (viii) defective cardiac contractility. Preclinical data suggest that there is merit in targeting the identified pathways; however, their clinical implications and outcomes regarding treating HF need further investigation in the future. Herein, we introduce the molecular mechanisms pivotal in the onset and progression of HF, as well as compounds targeting the related mechanisms and their therapeutic potential in preventing or rescuing HF. This, therefore, offers an avenue for the design and discovery of novel therapies for the treatment of HF.

Mitochondrial alterations and signatures in hepatocellular carcinoma

Hepatocellular carcinoma (HCC) is the most common type of primary liver cancer worldwide. Its primary risk factors are chronic liver diseases such as metabolic fatty liver disease, non-alcoholic steatohepatitis, and hepatitis B and C viral infections. These conditions contribute to a specific microenvironment in liver tumors which affects mitochondrial function. Mitochondria are energy producers in cells and are responsible for maintaining normal functions by controlling mitochondrial redox homeostasis, metabolism, bioenergetics, and cell death pathways. HCC involves abnormal mitochondrial functions, such as accumulation of reactive oxygen species, oxidative stress, hypoxia, impairment of the mitochondrial unfolded protein response, irregularities in mitochondrial dynamic fusion/fission mechanisms, and mitophagy. Cell death mechanisms, such as necroptosis, pyroptosis, ferroptosis, and cuproptosis, contribute to hepatocarcinogenesis and play a significant role in chemoresistance. The relationship between mitochondrial dynamics and HCC is thus noteworthy. In this review, we summarize the recent advances in mitochondrial alterations and signatures in HCC and attempt to elucidate its molecular biology. Here, we provide an overview of the mitochondrial processes involved in hepatocarcinogenesis and offer new insights into the molecular pathology of the disease. This may help guide future research focused on improving patient outcomes using innovative therapies.

[Mechanism of sodium valproate in inhibiting ferroptosis of bone marrow mesenchymal stem cells via the adenosine monophosphate-activated protein kinase/Sirtuin 1 axis]

Objective

To investigate the effects of sodium valproate (VPA) in inhibiting Erastin-induced ferroptosis in bone marrow mesenchymal stem cells (BMSCs) and its underlying mechanisms.

Methods

BMSCs were isolated from bone marrow of 8-week-old Spragur Dawley rats and identified [cell surface antigens CD90, CD44, and CD45 were analyzed by flow cytometry, and osteogenic and adipogenic differentiation abilities were assessed by alizarin red S (ARS) and oil red O staining, respectively]. Cells of passage 3 were used for the Erastin-induced ferroptosis model, with different concentrations of VPA for intervention. The optimal drug concentration was determined using the cell counting kit 8 assay. The experiment was divided into 4 groups: group A, cells were cultured in osteogenic induction medium for 24 hours; group B, cells were cultured in osteogenic induction medium containing optimal concentration Erastin for 24 hours; group C, cells were cultured in osteogenic induction medium containing optimal concentration Erastin and VPA for 24 hours; group D, cells were cultured in osteogenic induction medium containing optimal concentration Erastin and VPA, and 8 μmol/L EX527 for 24 hours. The mitochondrial state of the cells was evaluated, including the levels of malondialdehyde (MDA), glutathione (GSH), and reactive oxygen species (ROS). Osteogenic capacity was assessed by alkaline phosphatase (ALP) activity and ARS staining. Western blot analysis was performed to detect the expressions of osteogenic-related proteins [Runt-related transcription factor 2 (RUNX2) and osteopontin (OPN)], ferroptosis-related proteins [glutathione peroxidase 4 (GPX4), ferritin heavy chain 1 (FTH1), and solute carrier family 7 member 11 (SLC7A11)], and pathway-related proteins [adenosine monophosphate-activated protein kinase (AMPK) and Sirtuin 1 (SIRT1)].

Results

The cultured cells were identified as BMSCs. VPA inhibited Erastin-induced ferroptosis and the decline of osteogenic ability in BMSCs, acting through the activation of the AMPK/SIRT1 pathway. VPA significantly reduced the levels of ROS and MDA in Erastin-treated BMSCs and significantly increased GSH levels. Additionally, the expression levels of ferroptosis-related proteins (GPX4, FTH1, and SLC7A11) significantly decreased. VPA also upregulated the expressions of osteogenic-related proteins (RUNX2 and OPN), enhanced mineralization and osteogenic differentiation, and increased the expressions of pathway-related proteins (AMPK and SIRT1). These effects could be reversed by the SIRT1 inhibitor EX527.

Conclusion

VPA inhibits ferroptosis in BMSCs through the AMPK/SIRT1 axis and promotes osteogenesis.