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X-ray-induced DNA damage spectrum in dilute aqueous solution: Selective protection by amino acid addition. 稀水溶液中x射线诱导的DNA损伤谱:氨基酸添加的选择性保护。
IF 2.9 3区 生物学
Free Radical Research Pub Date : 2025-10-01 Epub Date: 2025-12-01 DOI: 10.1080/10715762.2025.2595169
Yui Obata, Chaozhong Tian, Shinichi Yamashita
{"title":"X-ray-induced DNA damage spectrum in dilute aqueous solution: Selective protection by amino acid addition.","authors":"Yui Obata, Chaozhong Tian, Shinichi Yamashita","doi":"10.1080/10715762.2025.2595169","DOIUrl":"10.1080/10715762.2025.2595169","url":null,"abstract":"<p><p>DNA damage arises not only from the direct action of ionizing radiation but also from indirect action mediated by highly reactive hydroxyl radicals (<sup>•</sup>OH). This study aimed to determine whether the protective or sensitizing effects of amino acids against X-ray-induced DNA damage are associated with the side-chain characteristics of these amino acids. Seven amino acids with distinct side-chain properties were investigated. The rate constants for their reactions with <sup>•</sup>OH were determined by electron pulse radiolysis. Highly purified, scavenger-free plasmid DNA (pUC18) was irradiated with X-rays in the presence of each amino acid, whose concentrations were adjusted to scavenge ∼14% of <sup>•</sup>OH. DNA strand breaks (SSBs and DSBs) were quantified by agarose gel electrophoresis. At the same time, oxidative base lesions and apurinic/apyrimidinic (AP) sites were detected as enzyme-sensitive sites (ESSs) using formamidopyrimidine-DNA glycosylase (Fpg), endonuclease III (Nth), and endonuclease IV (Nfo). Despite equivalent <sup>•</sup>OH scavenging capacities, the extent and spectrum of DNA damage varied markedly among the amino acids. Aspartic acid (Asp) and phenylalanine (Phe) exhibited the strongest overall protection, while glycine (Gly) showed the weakest protection, even with partial sensitization. Amino acids with highly hydrophilic or hydrophobic side chains tended to exhibit more substantial protective effects, although a clear correlation was not always observed for molecular weight or isoelectric point. Side-chain properties and potential chemical repair mechanisms are likely to contribute to the modulation of DNA damage. This work provides new mechanistic insights into amino acid-mediated DNA radioprotection, suggesting promising directions for molecular-level studies of amino-acid-DNA interactions.</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"815-823"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145603442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Therapeutic potential of nicotine in modulating oxidative and mitochondrial pathways in a C. elegans Parkinson's disease model. 尼古丁在秀丽隐杆线虫帕金森病模型中调节氧化和线粒体通路的治疗潜力
IF 2.9 3区 生物学
Free Radical Research Pub Date : 2025-10-01 Epub Date: 2025-10-06 DOI: 10.1080/10715762.2025.2567430
Inam Ullah, Shahab Uddin, Wang Xin, Hongyu Li
{"title":"Therapeutic potential of nicotine in modulating oxidative and mitochondrial pathways in a <i>C. elegans</i> Parkinson's disease model.","authors":"Inam Ullah, Shahab Uddin, Wang Xin, Hongyu Li","doi":"10.1080/10715762.2025.2567430","DOIUrl":"10.1080/10715762.2025.2567430","url":null,"abstract":"<p><p>Parkinson's disease (PD) is one of the most widespread neurodegenerative diseases that affect the central nervous system (CNS) in elderly individuals. As of right now, there is no recognized cure for this illness. Bioactive phytochemicals are a natural alternative that can help older persons postpone age-related cognitive diseases. This study attempts to establish whether nicotine, may diminish Parkinsonism in a model of <i>Caenorhabditis elegans</i> disease. This study analyzes the antioxidant and restorative mitochondrial dysfunction potential of nicotine and its related neuroprotective benefits by utilizing models of Caenorhabditis worm strains that are different from the wild type. We examined the effects of nicotine on oxidative stress tolerance and associated regulatory pathways using a model of Caenorhabditis worms. Our results showed that wild-type <i>C. elegans</i> treated with nicotine had higher survival rates during oxidative stress caused by Juglone than those treated with the control. Nicotine decreased intracellular reactive oxygen species levels in <i>C. elegans</i>. In addition, nicotine increased levels of SOD, CAT, and MDA as well as the expression of genes related to stress response, including gst-4, hsf-6, and hsf-1, and mitochondrial function genes, including mev-1, isp-1, and cox-4. Finally, our molecular analysis indicates that the anti-oxidative effects of nicotine are mediated <i>via</i> skin-1 modulation. After Paraquat was administered, nicotine therapy also resulted in higher levels of ATP and MMP. Our research clarifies the various mechanisms of action and communication pathways that underlie nicotine's antioxidant activity <i>in vivo</i>, offering a solid pharmacological foundation for its potential therapeutic use in neurodegeneration.</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"716-733"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145191506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Melatonin inhibits liver ferroptosis in copper-laden rats: a potential therapy mechanism underlying Wilson's disease. 褪黑素抑制含铜大鼠肝铁下垂:威尔逊病的潜在治疗机制。
IF 2.9 3区 生物学
Free Radical Research Pub Date : 2025-10-01 Epub Date: 2025-12-01 DOI: 10.1080/10715762.2025.2593446
Lihong Zhou, Xiaodan Zhang, Yulong Peng, Shiyu He, Zhen Mao, Jin Cai, Hong Yang, Peili Huang
{"title":"Melatonin inhibits liver ferroptosis in copper-laden rats: a potential therapy mechanism underlying Wilson's disease.","authors":"Lihong Zhou, Xiaodan Zhang, Yulong Peng, Shiyu He, Zhen Mao, Jin Cai, Hong Yang, Peili Huang","doi":"10.1080/10715762.2025.2593446","DOIUrl":"10.1080/10715762.2025.2593446","url":null,"abstract":"<p><p>Wilson's disease (WD) is an autosomal recessive disorder associated with impaired copper metabolism that results in hepatic manifestations. However, as a rare disease, the underlying pathogenic mechanism and drug development have lagged behind. Studies have reported that copper accumulation is associated with potential increases in iron levels, which can lead to further exacerbation of oxidative damage and has been observed in WD patients. Therefore, removing excess copper from the body and enhancing antioxidant capacity are crucial in treatment. Melatonin (MLT) is an endogenous hormone with anti-oxidative stress, anti-inflammatory, and anti-ferroptosis properties, and can chelate transition metals. Thus, the study aimed to investigated the relationship between WD and ferroptosis, and the therapeutic efficacy and mechanism of MLT using copper-laden rats and HepG2 cell models. Our results suggested that copper overload significantly increased oxidative stress and altering ferroptosis-related metabolites of the liver in copper-laden rats. <i>In vivo</i> and <i>in vitro</i> experiments showed that copper overload disrupts the ceruloplasmin-ferroportin (Cp-Fpn) iron transport system, leading to increased iron levels and promoting ferroptosis, as indicated by the decreased levels of ferroptosis-related proteins GPX4, with these findings further supported by RSL3 and Ferrostatin-1. Further, we found that MLT could improve liver function, iron levels and enhance its antioxidant capacity. In addition, MLT was also able to inhibit ferroptosis by activating the Nrf2/SLC7A11/GPX4 pathway. The effect is more effective than penicillamine, the current therapeutic drugs.Key Policy HighlightsCopper overload induces hepatic ferroptosis in Wilson's disease via iron accumulation, glutathione depletion, and lipid peroxidation.Reduced ceruloplasmin disrupts the ferroportin-mediated iron efflux system, aggravating ferroptosis.Melatonin alleviates liver injury and copper accumulation by inhibiting ferroptosis via activation of the Nrf2/SCL7A11/Gpx4 pathway.</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"797-814"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145582083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interactions of di- and trihydroxybenzenes with transition metals and their biological consequences. 二羟基苯和三羟基苯与过渡金属的相互作用及其生物学后果。
IF 2.9 3区 生物学
Free Radical Research Pub Date : 2025-10-01 Epub Date: 2025-12-16 DOI: 10.1080/10715762.2025.2598763
Zuzana Lomozová, Patrícia Harčárová, Bohdan Adler, Jana Karlíčková, Radim Kučera, Přemysl Mladěnka
{"title":"Interactions of di- and trihydroxybenzenes with transition metals and their biological consequences.","authors":"Zuzana Lomozová, Patrícia Harčárová, Bohdan Adler, Jana Karlíčková, Radim Kučera, Přemysl Mladěnka","doi":"10.1080/10715762.2025.2598763","DOIUrl":"10.1080/10715762.2025.2598763","url":null,"abstract":"<p><p>Small dihydroxy- and trihydroxybenzenes are polyphenolic compounds found in plant-based materials and formed by the human gut microbiota from other dietary phenolics. This study aimed to explore how 5 structurally related hydroxybenzenes interact with the biologically relevant metals iron and copper under various (patho)physiological pH conditions, focusing on their chelating and reducing abilities, influence on the metal-driven Fenton reactions, and their role in copper-induced hemolysis. Only compounds with hydroxyl groups in an <i>ortho-</i>position, specifically pyrogallol and 4-methylcatechol, were able to strongly chelate Fe<sup>2+</sup> at neutral pH and exhibited the largest capacity to reduce Fe³<sup>+</sup> and Cu<sup>2+</sup>. However, the ability to chelate metals did not translate into inhibition of the Fenton reaction. Only 2,4-dihydroxyacetophenone and resorcinol, compounds with hydroxyl groups in a <i>meta</i>-position that lack chelating capability, were effective in suppressing hydroxyl radical formation triggered by the Fe<sup>2+</sup>-driven Fenton reaction. Interestingly, pyrogallol, despite its strong pro-oxidant properties, was the only compound that protected human erythrocytes from Cu-induced lysis. In conclusion, solely pyrogallol seems to have a protective effect against copper-induced toxicity under biologically relevant conditions.</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"824-839"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145667534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatiotemporal analysis of ROS in hepatic ischemia-reperfusion and prediction of organ damage using MRI. 肝缺血再灌注中ROS的时空分析及MRI预测器官损伤。
IF 2.9 3区 生物学
Free Radical Research Pub Date : 2025-10-01 Epub Date: 2025-10-11 DOI: 10.1080/10715762.2025.2573374
Atsushi Yamashita, Hitoshi Togashi, Kazuyuki Haga, Shingo Nakai, Yoshinori Kuroda, Mitsuaki Sadahiro, Tetsuro Uchida
{"title":"Spatiotemporal analysis of ROS in hepatic ischemia-reperfusion and prediction of organ damage using MRI.","authors":"Atsushi Yamashita, Hitoshi Togashi, Kazuyuki Haga, Shingo Nakai, Yoshinori Kuroda, Mitsuaki Sadahiro, Tetsuro Uchida","doi":"10.1080/10715762.2025.2573374","DOIUrl":"10.1080/10715762.2025.2573374","url":null,"abstract":"<p><p>Our study focused on the spatiotemporal analysis of reactive oxygen species (ROS), a key factor in hepatic ischemia-reperfusion injury, using a rat model to evaluate potential clinical applications. By inducing partial hepatic ischemia-reperfusion in rats through ligation of left portal vein and hepatic artery (one hour ischemia followed by reperfusion), we explored ROS generation using an imaging probe, 1-acetoxy-3-carbamoyl-2,2,5,5-tetramethylpyrroline (ACP), which reacts with ROS to produce a detectable T1-enhanced magnet resonance imaging (MRI) signal. In the rat model, the region of the left liver ischemia-reperfusion showed extremely mild liver injury one hour after reperfusion. After 12 h of reperfusion, extensive hepatocellular necrosis was observed, mainly in the hepatic interlobular region. One hour after reperfusion, the ACP-derived MRI signal increased in the region of left lobe ischemia-reperfusion was significantly higher than that in the non-ischemia-reperfusion region of the same rat right lobe. Administration of edaravone targeting the period of excessive ROS production at 1 h after reperfusion significantly suppressed hepatic injury 12 h after ischemia-reperfusion. Given MRI's crucial role in clinical diagnostics and its adaptability, our research suggests a promising strategy for early intervention in organ damage by monitoring and modulating ROS levels, potentially revolutionizing patient care.</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"758-768"},"PeriodicalIF":2.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145250632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mitochondria and redox homeostasis - the backseat drivers in glioma. 线粒体和氧化还原稳态-神经胶质瘤的后座驾驶员。
IF 2.9 3区 生物学
Free Radical Research Pub Date : 2025-08-01 Epub Date: 2025-08-23 DOI: 10.1080/10715762.2025.2548479
Shruti Patrick, Ellora Sen
{"title":"Mitochondria and redox homeostasis - the backseat drivers in glioma.","authors":"Shruti Patrick, Ellora Sen","doi":"10.1080/10715762.2025.2548479","DOIUrl":"10.1080/10715762.2025.2548479","url":null,"abstract":"<p><p>Mitochondrial function and redox regulatory processes are crucial aspects of cellular metabolism and energy production. Cancers, including gliomas, largely exhibit altered mitochondrial function, which can lead to changes in cellular signaling pathways and redox homeostasis. Aberrant redox signaling can promote glioma progression by influencing cell proliferation, metastasis, and therapeutic response. Several cancer-associated driver mutations - genetic alterations that confer survival and growth advantage to cancer cells, are associated with gliomas and affect mitochondrial function and redox states. Here is an overview of the crucial intersection between mitochondrial function and driver genes in glioma, highlighting some of the recent advances that augment our understanding of this intersection.</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"557-569"},"PeriodicalIF":2.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144845317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Selenoprotein GPX3 suppresses gastric adenocarcinoma proliferation and improves patient survival. 硒蛋白GPX3抑制胃腺癌增殖,提高患者生存率。
IF 2.9 3区 生物学
Free Radical Research Pub Date : 2025-08-01 Epub Date: 2025-09-03 DOI: 10.1080/10715762.2025.2551031
Chunfeng Zhang, Lijuan Ma, Ying Shao, Shanpeng Cui, Li Li
{"title":"Selenoprotein GPX3 suppresses gastric adenocarcinoma proliferation and improves patient survival.","authors":"Chunfeng Zhang, Lijuan Ma, Ying Shao, Shanpeng Cui, Li Li","doi":"10.1080/10715762.2025.2551031","DOIUrl":"10.1080/10715762.2025.2551031","url":null,"abstract":"<p><p>Stomach adenocarcinoma (STAD) is a highly prevalent and lethal malignancy worldwide, with its occurrence and progression regulated by multiple factors. In recent years, selenoprotein glutathione peroxidase 3 (GPX3) has gained significant attention due to its antioxidant properties and role in cellular oxidative stress regulation across various cancers. Our study delved into the expression of GPX3 in STAD and investigated its impact on tumor cell growth, providing insights into its potential anti-tumor mechanisms. The expression levels of GPX3 were analyzed in STAD tissues sourced from the TCGA database and contrasted with the levels found in normal gastric tissues. The expression levels of GPX3 were contrasted between STAD tissues and normal gastric tissues, and their correlation with patient prognosis was assessed by survival analysis. Additionally, we validated GPX3 expression changes and its effects on tumor cell growth using quantitative PCR (qPCR) and CCK-8 proliferation assays in STAD cell lines (MNK-45, MGC-803, N87, and HGC-27). Our findings suggest that GPX3 expression is significantly downregulated in STAD tissues compared to normal gastric tissues. Survival analysis further reveals that patients with high GPX3 expression exhibit better long-term survival rates, suggesting a potential tumor-suppressive function. <i>In vitro</i> experiments confirmed effective knockdown or overexpression of GPX3 in STAD cell lines. CCK-8 proliferation assays demonstrated that GPX3 overexpression significantly inhibited tumor cell proliferation, whereas GPX3 knockdown promoted cell growth. This study provides new experimental evidence supporting GPX3 as a potential therapeutic target for STAD and offers a theoretical foundation for future molecular-targeted therapies for STAD.</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"583-591"},"PeriodicalIF":2.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144948652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Copper induces cystine/glutamate antiporter SLC7A11 through the activation of Nrf2 and Atox1 pathways. 铜通过激活Nrf2和Atox1通路诱导胱氨酸/谷氨酸反转运蛋白SLC7A11。
IF 3.1 3区 生物学
Free Radical Research Pub Date : 2025-08-01 Epub Date: 2025-09-19 DOI: 10.1080/10715762.2025.2560847
Tetsuro Kamiya, Ryoka Teruya, Haruka Tahara, Yuki Inoue, Aoi Ikeda, Sayaka Hosowari, Tomo Arioka, Tomohiro Otsuka, Hirokazu Hara
{"title":"Copper induces cystine/glutamate antiporter SLC7A11 through the activation of Nrf2 and Atox1 pathways.","authors":"Tetsuro Kamiya, Ryoka Teruya, Haruka Tahara, Yuki Inoue, Aoi Ikeda, Sayaka Hosowari, Tomo Arioka, Tomohiro Otsuka, Hirokazu Hara","doi":"10.1080/10715762.2025.2560847","DOIUrl":"10.1080/10715762.2025.2560847","url":null,"abstract":"<p><p>Amino acid metabolism plays a crucial role in tumor biology. The sodium-independent cystine/glutamate exchange system, known as system X<sub>c</sub><sup>-</sup>, is significantly activated in cancer cells and plays a role in tumor progression. Copper (Cu), an essential micronutrient, plays a crucial role in physiological processes; however, its accumulation in tumors has been associated with tumor progression. Nonetheless, the relationship between system X<sub>c</sub><sup>-</sup>-mediated amino acid metabolism and Cu remains inadequately understood. In this study, CuCl<sub>2</sub> treatment resulted in the significant induction of SLC7A11, a light chain subunit of system X<sub>c</sub><sup>-</sup>, and glutamate receptor mGluR1 expression in human triple-negative MDA-MB-231 cells. Conversely, FeCl<sub>2</sub> treatment induced the expression of SLC7A11 but not mGluR1, indicating that Cu specifically activated SLC7A11-mediated amino acid metabolism. The investigation focused on the role of Nrf2, a redox-sensitive transcription factor, in the induction of SLC7A11 under conditions of oxidative stress induced by CuCl<sub>2</sub> treatment. Upon treatment with CuCl<sub>2</sub>, the nuclear translocation of Nrf2 was observed, and knockdown of Nrf2 significantly suppressed the induction of SLC7A11. Given that the Cu chaperone, antioxidant-1 (Atox1), functions as a Cu-dependent transcription factor, the role of Atox1 in the expression of SLC7A11 was further investigated. Like the effects of Nrf2 knockdown, Atox1 was found to play a pivotal role in the Cu-mediated induction of SLC7A11. Our findings indicate that intratumoral Cu influences the expression of SLC7A11 and may play a role in tumor progression.</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"634-645"},"PeriodicalIF":3.1,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145052751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Differential dihydroethidium fluorescence spectra in cell-free and cellular superoxide models: roles of riboflavin, FMN, FAD, and ions. 在无细胞和细胞超氧化物模型中的差异二氢乙啶荧光光谱:核黄素,FMN, FAD和离子的作用。
IF 2.9 3区 生物学
Free Radical Research Pub Date : 2025-08-01 Epub Date: 2025-09-24 DOI: 10.1080/10715762.2025.2564671
Bong-Geum Jang, Boyoung Choi, Ji-Eun Kim, Min-Ju Kim
{"title":"Differential dihydroethidium fluorescence spectra in cell-free and cellular superoxide models: roles of riboflavin, FMN, FAD, and ions.","authors":"Bong-Geum Jang, Boyoung Choi, Ji-Eun Kim, Min-Ju Kim","doi":"10.1080/10715762.2025.2564671","DOIUrl":"10.1080/10715762.2025.2564671","url":null,"abstract":"<p><p>Dihydroethidium (DHE) is widely used for superoxide detection, yet reported excitation and emission values vary across studies. To address this, we employed full-spectrum scanning to compare DHE fluorescence between a xanthine oxidase (XO)-based cell-free system and a rotenone-treated cellular model, and to assess factors contributing to spectral shifts. In the XO system, the excitation peak was ∼480 nm, whereas in cells it shifted to ∼520 nm. Riboflavin, flavin mononucleotide (FMN), and flavin adenine dinucleotide (FAD) accounted for this shift, while calcium and bicarbonate ions modulated both peak position and fluorescence intensity. Riboflavin depletion reduced intracellular flavin levels but did not restore the peak to 480 nm, indicating additional roles for FMN and FAD. Among scavengers, only tiron directly inhibited DHE fluorescence in the cell-free system, with enhanced activity in the presence of Ca<sup>2+</sup> and Mg<sup>2+</sup>. In contrast, responses in cells varied by type and rotenone concentration, suggesting indirect modulation through endogenous antioxidant defenses. Addition of FMN, FAD, or cell lysates to the cell-free system attenuated scavenger efficacy, supporting intracellular interference. These findings demonstrate that riboflavin metabolism and ionic microenvironments critically shape DHE spectral behavior. Accurate interpretation of DHE-based superoxide detection therefore requires prior spectral evaluation to distinguish genuine superoxide signals from cofactor- or ion-dependent effects.</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"646-666"},"PeriodicalIF":2.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145112113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Betulinic acid protects SH-SY5Y cells exposed to lipopolysaccharide and ferrous sulfate through p38MAPK/NF-κB/GPX4/Nrf2/keap-1/HO-1 signaling axis. 白桦酸通过p38MAPK/NF-κB/GPX4/Nrf2/Keap-1/HO-1信号轴保护暴露于脂多糖和硫酸亚铁的SH-SY5Y细胞。
IF 2.9 3区 生物学
Free Radical Research Pub Date : 2025-08-01 Epub Date: 2025-09-27 DOI: 10.1080/10715762.2025.2565686
Shivam Kumar Pandey, Hardev Singh, Shad Ahmad, Rakesh Kumar Singh
{"title":"Betulinic acid protects SH-SY5Y cells exposed to lipopolysaccharide and ferrous sulfate through p38MAPK/NF-κB/GPX4/Nrf2/keap-1/HO-1 signaling axis.","authors":"Shivam Kumar Pandey, Hardev Singh, Shad Ahmad, Rakesh Kumar Singh","doi":"10.1080/10715762.2025.2565686","DOIUrl":"10.1080/10715762.2025.2565686","url":null,"abstract":"<p><p>Betulinic acid (BA) is a pentacyclic triterpenoid with broad pharmacological potential and widely recognized for its neuroprotective effects. This study investigated the potential protective effects of this compound on <i>in vitro</i> differentiated human neuroblastoma SH-SY5Y cells against LPS and FeSO<sub>4</sub>-induced ferroptosis, apoptosis, neuroinflammation, and dopaminergic cell death, and explored the underlying mechanisms. Differentiated human neuroblastoma SH-SY5Y cells were exposed to LPS and FeSO<sub>4</sub>, and the cellular viability was evaluated using the MTT assay. Flow cytometry was performed to assess apoptotic cell death. Additionally, the expression levels of key markers associated with ferroptosis, apoptosis, and other relevant signaling proteins were analyzed through western blotting and Immunocytochemical staining techniques. However, co<b>-</b>exposure with LPS and FeSO<sub>4</sub> resulted in a dose-dependent reduction in cell viability, which was significantly reversed by pretreatment with BA (0.3-30μM). Exposure to LPS and FeSO<sub>4</sub> increased the DMT1, Bax, caspase-3, and alpha-synuclein, and decreased the GPX4, FTH1, SLC7A11, Nrf2, Keap1, HO-1, PARK7, Bcl-2, NeuN, and TH levels, resulting in cell ferroptosis, apoptosis, and dopaminergic cell death. Furthermore, LPS and FeSO<sub>4</sub> significantly increased the expression of IL-6, TNF-α, and phosphorylation of p38, pMAPK, and pNFkB in the cells. Pretreatment with BA markedly suppressed LPS and FeSO<sub>4</sub>-induced upregulation of pro-inflammatory cytokines, ferroptosis, apoptosis, and dopaminergic cell death markers. These findings suggest that BA exerts neuroprotection by modulating the GPX4/Nrf2/Keap-1/HO-1 antioxidant defense and p38MAPK/NF-κB inflammatory signaling pathways, highlighting its potential as a therapeutic agent for oxidative stress-related neurodegenerative conditions, such as Parkinson's disease (PD).</p>","PeriodicalId":12411,"journal":{"name":"Free Radical Research","volume":" ","pages":"688-706"},"PeriodicalIF":2.9,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145124248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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