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Celastrol nanomedicine eye drops restore redox homeostasis and prevents keratoconus progression via PI3K/AKT/AP-1 signaling Celastrol纳米药物滴眼液通过PI3K/AKT/AP-1信号恢复氧化还原稳态并阻止圆锥角膜进展
IF 11.9 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-23 DOI: 10.1016/j.redox.2025.103990
Ruixing Liu, Ruojun Ma, Nan Zhang, Xingchen Geng, Jingguo Li, Lei Zhu, Zhanrong Li
Keratoconus (KC) is a progressive corneal disorder primarily driven by oxidative stress, though its precise molecular mechanisms remain incompletely understood, and effective pharmacological treatments are currently lacking. Our proteomic analysis of human KC tissues identified significant oxidative stress signatures and potential PI3K pathway in disease pathogenesis. Subsequent immunohistochemical and Western blot analyses confirmed a pronounced Nox/Nrf-2 redox imbalance - characterized by elevated Nox-4 and Nox-2 and suppressed Nrf-2 - along with activation of the PI3K/AKT/AP-1 signaling axis in KC corneas compared to normal corneas. To model KC-associated oxidative damage in vitro, hydrogen peroxide was used to stimulate rabbit corneal stromal cells. We developed cationic polymeric nanomicelles loaded celastrol (CPNM) to enhance corneal permeability and achieve sustain drug release. In a rabbit KC model, CPNM treatment attenuated corneal curvature progression, increased stromal thickness, and reduced reactive oxygen species (ROS) levels, as assessed by slit-lamp examination, histology, pachymetry, curvature measurements, and biochemical assays. Immunohistochemistry and immunofluorescence further demonstrated that CPNM downregulated PI3K/AKT/AP-1 pathway and restored Nox/Nrf-2 balance in corneal tissues. In vitro, CPNM suppressed ROS, rebalanced the Nox/Nrf-2 system, inhibited PI3K/AKT/AP-1 activation, and reduced matrix metalloproteinase activity. Our findings indicate that CPNM prevents KC progression by concurrently inhibiting oxidative stress via Nox/Nrf-2 balance and suppressing extracellular matrix degradation via PI3K/AKT/AP-1 signaling axis, positioning it as a promising clinical treatment strategy to halt KC progression.
圆锥角膜(KC)是一种主要由氧化应激引起的进行性角膜疾病,尽管其确切的分子机制尚不完全清楚,目前缺乏有效的药物治疗。我们对人类KC组织的蛋白质组学分析发现了明显的氧化应激特征和潜在的PI3K通路在疾病发病机制中。随后的免疫组织化学和Western blot分析证实,与正常角膜相比,KC角膜中存在明显的Nox/Nrf-2氧化还原失衡,其特征是Nox-4和Nox-2升高,Nrf-2抑制,以及PI3K/AKT/AP-1信号轴的激活。为了在体外建立kc相关的氧化损伤模型,我们用过氧化氢刺激兔角膜基质细胞。我们开发了一种阳离子聚合物纳米胶束负载的雷公藤红素(CPNM),以增强角膜的渗透性并实现药物的持续释放。在兔KC模型中,通过裂隙灯检查、组织学、厚度测量、曲率测量和生化分析,CPNM治疗可减轻角膜曲率进展,增加间质厚度,降低活性氧(ROS)水平。免疫组织化学和免疫荧光进一步证实,CPNM下调PI3K/AKT/AP-1通路,恢复角膜组织Nox/Nrf-2平衡。在体外,CPNM抑制ROS,重新平衡Nox/Nrf-2系统,抑制PI3K/AKT/AP-1激活,降低基质金属蛋白酶活性。我们的研究结果表明,CPNM通过Nox/Nrf-2平衡同时抑制氧化应激,并通过PI3K/AKT/AP-1信号轴抑制细胞外基质降解,从而阻止KC进展,将其定位为一种有希望的临床治疗策略,以阻止KC进展。
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引用次数: 0
Upregulation of PPTC7 in brain microvascular endothelial cell aggravates diabetic cognitive dysfunction by impairing PHB2 mediated mitochondrial function 脑微血管内皮细胞PPTC7上调通过损害PHB2介导的线粒体功能加重糖尿病认知功能障碍
IF 11.9 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-22 DOI: 10.1016/j.redox.2025.103991
Fan Yang , Pengcheng Pang , Kang Yang , Xinyu Niu , Fang Cheng , Wei Li
Blood-brain barrier impairment (BBB) is the pathological basis of diabetic cognitive dysfunction. Brain microvascular endothelial cells (BMECs) are one of the most mitochondria-rich cell types within the BBB. Mitochondrial dysfunction in BMECs is defined as a pivotal event in diabetic cognitive dysfunction; however, the underlying mechanisms remain poorly understood. Protein phosphatase targeting COQ7 (PPTC7) was screened from RNA-sequencing analysis and its role in regulating mitochondrial function was in both in vitro and in vivo models. PPTC7 expression was predominantly upregulated in BMECs of type 2 diabetes mellitus mice. Genetic manipulations using short hairpin RNA and endothelial-specific adeno-associated virus were applied to investigate the effects of PPTC7 in diabetic cognitive dysfunction. PPTC7 deficiency upregulated mitochondrial oxidative phosphorylation, mitochondrial membrane potential, and mitophagy, but downregulated mitochondrial reactive oxygen species levels in BMECs. Mechanistically, mass spectrometry screening and co-immunoprecipitation assays demonstrated the interaction of PPTC7 with prohibitin 2 (PHB2). PPTC7 disrupts mitochondrial function in BMECs via PHB2 by promoting its ubiquitin-proteasome degradation, which in turn aggravates BBB damage and contributes to diabetic cognitive dysfunction.
血脑屏障损伤(BBB)是糖尿病认知功能障碍的病理基础。脑微血管内皮细胞(BMECs)是血脑屏障内线粒体最丰富的细胞类型之一。bmec线粒体功能障碍被定义为糖尿病认知功能障碍的关键事件;然而,潜在的机制仍然知之甚少。通过rna测序分析筛选出COQ7靶蛋白磷酸酶(Protein phosphatase targeting COQ7, PPTC7),其在体外和体内模型中调控线粒体功能的作用。PPTC7在2型糖尿病小鼠bmec中表达明显上调。利用短发夹RNA和内皮特异性腺相关病毒进行遗传操作,研究PPTC7在糖尿病认知功能障碍中的作用。PPTC7缺乏上调线粒体氧化磷酸化、线粒体膜电位和线粒体自噬,但下调bmec线粒体活性氧水平。机制上,质谱筛选和共免疫沉淀试验表明PPTC7与禁止蛋白2 (PHB2)相互作用。PPTC7通过促进其泛素蛋白酶体降解,通过PHB2破坏BMECs的线粒体功能,进而加重血脑屏障损伤,导致糖尿病认知功能障碍。
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引用次数: 0
Retraction notice to “Remote transplantation of human adipose-derived stem cells induces regression of cardiac hypertrophy by regulating the macrophage polarization in spontaneously hypertensive rats” [Redox Biology 27 (2019) 101170] “人脂肪源性干细胞远程移植通过调节自发性高血压大鼠巨噬细胞极化诱导心肌肥厚消退”撤回通知[氧化还原生物学27(2019)101170]。
IF 11.9 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-22 DOI: 10.1016/j.redox.2025.103983
Tsung-Ming Lee , Horng-Jyh Harn , Tzyy-Wen Chiou , Ming-Hsi Chuang , Chun-Hung Chen , Chi-Hsuan Chuang , Po-Cheng Lin , Shinn-Zong Lin
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引用次数: 0
Retraction notice to “BPTF promotes hepatocellular carcinoma growth by modulating hTERT signaling and cancer stem cell traits” [Redox Biology 20 (2019) 427–441] “BPTF通过调节hTERT信号和癌症干细胞特性促进肝细胞癌生长”的撤回通知[氧化还原生物学20(2019)427-441]。
IF 11.9 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-21 DOI: 10.1016/j.redox.2025.103984
Xinrui Zhao , Fufu Zheng , Yizhuo Li , Jiaojiao Hao , Zhipeng Tang , Chunfang Tian , Qian Yang , Tianhua Zhu , Chaoliang Diao , Changlin Zhang , Manyu Chen , Sheng Hu , Ping Guo , Lizhi Zhang , Yina Liao , Wendan Yu , Miao Chen , Lijuan Zou , Wei Guo , Wuguo Deng
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引用次数: 0
Redox-active nitroxides enhance cisplatin efficacy against cervical cancer 氧化还原活性氮氧化物增强顺铂抗宫颈癌疗效
IF 11.9 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-20 DOI: 10.1016/j.redox.2025.103989
Carl P. Soltau , Debottam Sinha , Lakshita P. Patil , Philip M. Moseley , Cassie L. Rayner , Nigel L. Barnett , Derek J. Richard , Steven E. Bottle , Ian H. Frazer , Alexander P. Martyn
Cisplatin remains the primary treatment for most cervical cancer cases, though its clinical efficacy is hindered by dose-dependent toxicity and incurring chemoresistance. The overexpression of the glucocorticoid receptor (GR) and cellular redox state is linked to increased resistance to chemotherapy in cervical cancer. This study explores the combinations of novel steroidal and nitroxide-based treatments to improve the efficacy of cisplatin against cervical cancer. Two lead nitroxide-functionalised prednisolone hybrids (CS91 and CS187) were identified for their potent anti-proliferative activity in multiple cervical squamous cell carcinoma (SCC) cell lines. These compounds exhibit comparable anti-proliferative activity to the parent nitroxides, while maintaining GR binding capability. When combined with cisplatin, CS91 and CS187 induced a dose-dependent reduction in cell viability across multiple cervical cancer cell lines, which was optimised to preserve above 80 % healthy cell viability but decrease cancer cell viability below 15 %. Mechanistic studies revealed that these compounds raised intracellular reactive oxygen species (ROS) levels, with further enhancement in combination with cisplatin. This combination approach was found to be synergistic, resulting in decreased glutathione (GSH) levels and increased DNA damage compared to cisplatin alone. In summary, nitroxide-based hybrids exhibit potent anti-proliferative effects and potentiate cisplatin efficacy through ROS-mediated mechanisms, offering a promising targeted strategy for cervical cancer treatment.
顺铂仍然是大多数宫颈癌病例的主要治疗方法,尽管其临床疗效受到剂量依赖性毒性和化疗耐药的阻碍。糖皮质激素受体(GR)的过度表达和细胞氧化还原状态与宫颈癌化疗耐药性增加有关。本研究探讨新型甾体和氮氧化物联合治疗提高顺铂治疗宫颈癌的疗效。两种氮化铅功能化强的松龙杂种(CS91和CS187)在多种宫颈鳞状细胞癌(SCC)细胞系中具有有效的抗增殖活性。这些化合物表现出与母体氮氧化物相当的抗增殖活性,同时保持GR结合能力。当与顺铂联合使用时,CS91和CS187诱导多种宫颈癌细胞系细胞活力的剂量依赖性降低,优化后可使健康细胞活力保持在80% %以上,但将癌细胞活力降低到15% %以下。机制研究表明,这些化合物提高细胞内活性氧(ROS)水平,并与顺铂联合进一步增强。这种联合方法被发现是协同的,与单用顺铂相比,导致谷胱甘肽(GSH)水平降低和DNA损伤增加。综上所述,基于氮氧化物的杂交体具有强大的抗增殖作用,并通过ros介导的机制增强顺铂的疗效,为宫颈癌治疗提供了一种有希望的靶向策略。
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引用次数: 0
Mitochondrial Dynamics and Their Role in the Pathogenesis of Age-Related Macular Degeneration: A Comprehensive Review 线粒体动力学及其在老年性黄斑变性发病机制中的作用:综述
IF 11.4 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-20 DOI: 10.1016/j.redox.2025.103976
Kai-Yang Chen, Hoi-Chun Chan, Wan-Wan Lin, Chi-Ming Chan
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引用次数: 0
Unravelling the anti-cancer mechanisms elicited by non-covalent thioredoxin reductase inhibitors for triple negative breast cancer therapy 揭示非共价硫氧还蛋白还原酶抑制剂对三阴性乳腺癌治疗的抗癌机制。
IF 11.9 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-19 DOI: 10.1016/j.redox.2025.103980
Abigail Rullo , Brenna Flowers , Keacha Chang , An Zhang , Valentina Z. Petukhova , Luke Harding , Sammy Y. Aboagye , Maurizio Bocchetta , Wei Qiu , David L. Williams , Francesco Angelucci , Pavel A Petukhov , Irida Kastrati
Thioredoxin reductases (cytosolic TXNRD1 and mitochondrial TXNRD2) are antioxidant enzymes often overexpressed in tumors, including triple negative breast cancer (TNBC), making them promising targets for cancer therapy. Inhibiting these enzymes may worsen the already elevated oxidative stress in cancer cells, ultimately leading to cell death through a pro-oxidant mechanism. However, selectively targeting TXNRDs has been challenging due to the traditional reliance on covalent inhibition strategies. Recent studies have identified a druggable allosteric pocket in this enzyme family, paving the way for the development of novel non-covalent inhibitors, referred to as TXNRD(i)s. These inhibitors have been tested in TNBC models and have demonstrated a range of anti-cancer effects.
To understand the molecular and cellular consequences of TXNRD(i)s, we conducted unbiased transcriptomic analyses and found that the gene expression changes induced by TXNRD(i) treatment closely mirror those resulting from TXNRD1 silencing, reinforcing TXNRD1 as the primary therapeutic target. While TXNRD(i) treatment increases redox stress in TNBC cells, this is not the main driver of the anti-cancer effect. Instead, TXNRD(i)s potently inhibit cell proliferation and induce G1 phase cell cycle arrest. Notably, supplementing cells with exogenous deoxynucleotides restores cell viability, cell cycle progression and partially reverses cell death. These findings indicate that TXNRD(i)s impair ribonucleotide reductase activity and deplete endogenous deoxynucleotide pools as the main mechanism of anti-cancer effects. We further demonstrate that TXNRD(i)s inhibit both TXNRD1 and TXNRD2, and that dual inhibition is more effective in suppressing TNBC cell growth. In vivo, TXNRD(i) treatment significantly impairs TNBC xenograft tumor growth and reduces proliferation-related genes. Collectively, these findings challenge the prevailing paradigm that all TXNRD inhibitors function through a pro-oxidant mechanism, instead highlighting that non-covalent TXNRD(i)s exert their effects by blocking proliferation offering a compelling therapeutic strategy for TNBC and potentially other cancers with elevated TXNRD expression.
硫氧还蛋白还原酶(细胞质TXNRD1和线粒体TXNRD2)是肿瘤中经常过度表达的抗氧化酶,包括三阴性乳腺癌(TNBC),使其成为癌症治疗的有希望的靶点。抑制这些酶可能会加重癌细胞中已经升高的氧化应激,最终通过促氧化机制导致细胞死亡。然而,由于传统上依赖于共价抑制策略,选择性靶向TXNRDs一直具有挑战性。最近的研究已经在这个酶家族中发现了一个可药物化的变构口袋,为开发新的非共价抑制剂铺平了道路,称为TXNRD(i)s。这些抑制剂已经在TNBC模型中进行了测试,并证明了一系列的抗癌作用。为了了解TXNRD(i)s的分子和细胞后果,我们进行了无偏倚的转录组学分析,发现TXNRD(i)治疗诱导的基因表达变化与TXNRD1沉默引起的基因表达变化密切相关,强化了TXNRD1作为主要治疗靶点的作用。虽然TXNRD(i)治疗增加了TNBC细胞的氧化还原应激,但这并不是抗癌作用的主要驱动因素。相反,TXNRD(i)可以有效抑制细胞增殖并诱导G1期细胞周期阻滞。值得注意的是,用外源性脱氧核苷酸补充细胞可以恢复细胞活力、细胞周期进程并部分逆转细胞死亡。这些发现表明,TXNRD(i)损害核糖核苷酸还原酶活性和耗尽内源性脱氧核苷酸库是其抗癌作用的主要机制。我们进一步证明TXNRD(i)同时抑制TXNRD1和TXNRD2,并且双重抑制在抑制TNBC细胞生长方面更有效。在体内,TXNRD(i)治疗显著损害TNBC异种移植肿瘤的生长并降低增殖相关基因。总的来说,这些发现挑战了所有TXNRD抑制剂通过促氧化机制起作用的主流范式,而不是强调非共价TXNRD(i)通过阻断增殖发挥作用,为TNBC和潜在的其他TXNRD表达升高的癌症提供了令人信服的治疗策略。
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引用次数: 0
Gram-negative bacterial outer membrane proteins and lipopolysaccharides key factors linking chicken coop environment and oxidative stress 革兰氏阴性菌外膜蛋白和脂多糖是鸡舍环境与氧化应激相关的关键因子
IF 11.9 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-18 DOI: 10.1016/j.redox.2025.103986
Xuan Liu , Yue Hao , Shanlong Tang , Xiusong Li , Liang Chen , Hongfu Zhang
High concentrations of particulate matter (PM) in poultry housing act as carriers for microbial aerosols, with Gram-negative bacteria and their outer membrane components—outer membrane proteins (OMPs) and lipopolysaccharide (LPS)—playing pivotal roles in disrupting redox homeostasis. This review systematically examines how OMPs and LPS drive mitochondrial dysfunction and oxidative damage, proposing the “mitochondrial-ROS axis” as an integrative framework to explain their convergent mechanisms. We evaluate evidence that OMPs promote iron dysregulation, target mitochondria, and initiate apoptotic signaling, whereas LPS triggers robust mitochondrial ROS bursts via TLR4/MyD88 and TRAF6-ECSIT pathways, leading to NLRP3 inflammasome activation and pyroptosis. And we further clarify the dynamic conflict between pathogen attack, mediated through the oxidative bursts of OMPs and LPS, and host reductive defenses, including peroxisomal activity, thioredoxin and glutathione systems, and uncoupling proteins. While this axis provides a useful predictive model for anticipating oxidative stress intensity and inflammatory activation, its applicability has notable constraints—such as the context-dependence of ROS in cell-fate decisions and the need for further avian-specific validation of key pathways. This synthesis provides a balanced perspective. Future studies should prioritize avian-specific validation of key pathways and elucidate the temporal dynamics and tissue specificity of ROS responses to inform targeted interventions in poultry health.
家禽舍中高浓度颗粒物(PM)是微生物气溶胶的载体,革兰氏阴性菌及其外膜成分——外膜蛋白(OMPs)和脂多糖(LPS)在破坏氧化还原稳态中起着关键作用。本综述系统地研究了OMPs和LPS如何驱动线粒体功能障碍和氧化损伤,提出了“线粒体- ros轴”作为解释其趋同机制的综合框架。我们评估了OMPs促进铁失调,靶向线粒体并启动凋亡信号传导的证据,而LPS通过TLR4/MyD88和TRAF6-ECSIT途径触发线粒体ROS爆发,导致NLRP3炎性体激活和焦亡。我们进一步阐明了病原体攻击(通过omp和LPS的氧化爆发介导)与宿主还原防御(包括过氧化物酶体活性、硫氧还蛋白和谷胱甘肽系统以及解偶联蛋白)之间的动态冲突。虽然这条轴为预测氧化应激强度和炎症激活提供了一个有用的预测模型,但它的适用性有明显的限制,例如ROS在细胞命运决定中的环境依赖性,以及需要进一步验证鸟类特异性的关键途径。这种综合提供了一个平衡的视角。未来的研究应优先考虑对关键通路的禽类特异性验证,并阐明ROS反应的时间动态和组织特异性,从而为家禽健康的靶向干预提供信息。
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引用次数: 0
Physiological oxygen levels reset K+ channel activity in human vascular endothelial cells 人血管内皮细胞的生理氧水平重置K+通道活性
IF 11.9 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-18 DOI: 10.1016/j.redox.2025.103981
Fan Yang , Ashia Wheeler-Crawford , Alan McIntyre , Giovanni E. Mann , Joern R. Steinert
Human endothelial cells (EC) play a critical role in vascular homeostasis and their function is influenced by oxygen tension. This study investigates for the first time the effects of long-term adaptation (5 days) of two major EC types to physiological oxygen tension (5 kPa) on basal and nitric oxide (NO)-modulated K+ channel activities. Whole-cell patch clamp experiments demonstrate that human umbilical vein EC (HUVEC) exhibit larger basal K+ outward and smaller inward currents under 5 kPa O2 compared to standard hyperoxic (18 kPa) culture conditions. Outward currents were potentiated by NO only under hyperoxia. Human cerebral microvascular EC (hCMEC/D3) showed larger outward currents under 5 kPa O2 which were further potentiated by NO. Pharmacological isolation of different K+ currents using tetraethylammonium, TRAM-34 and apamin revealed differential effects in EC adapted to 5 kPa or 18 kPa O2. Under 5 kPa O2, both cell types show greater contributions of TEA-sensitive currents and in addition hCMEC/D3 cells exhibit higher proportions of TRAM-34 and apamin-sensitive currents under 5 kPa O2. In HUVEC, changes in half-activation voltage and hyperpolarized membrane potentials were detected only under hyperoxic conditions following NO exposure, with both cell types exhibiting altered current activation kinetics of outward and inward currents. Notably, expression of KCa3.1, KCa1.1, KCa2.3 and Kir6.1 channels was unaffected by O2, suggesting that changes in whole-cell currents in both EC types were due to channel modulation. Thus, our findings reveal that physiological O2 tension shapes the electrophysiological phenotype of human EC by modulating K+ channel function and NO responsiveness. The novel insights into the modulation of EC K+ channels by O2 has implications for the regulation of vascular tone and design and use of experimental models in vitro for high throughput drug discovery and clinical translation.
人内皮细胞(EC)在血管稳态中起关键作用,其功能受氧张力的影响。本研究首次探讨了两种主要EC类型对生理氧张力(5 kPa)的长期适应(5天)对基础和一氧化氮(NO)调节的K+通道活性的影响。全细胞膜片钳实验表明,与标准高氧(18 kPa)培养条件相比,在5 kPa O2条件下,人脐静脉EC (HUVEC)表现出更大的基础K+外向和更小的内向电流。一氧化氮仅在高氧条件下增强向外电流。人脑微血管EC (hCMEC/D3)在5 kPa O2条件下表现出较大的向外电流,并被NO进一步增强。使用四乙基铵、TRAM-34和apamin对不同K+电流进行药理学分离,发现EC适应于5 kPa或18 kPa O2的差异效应。在5 kPa O2下,两种细胞类型都表现出更大的tea敏感电流贡献,此外,hCMEC/D3细胞在5 kPa O2下表现出更高的TRAM-34和apamin敏感电流比例。在HUVEC中,只有在NO暴露后的高氧条件下才检测到半激活电压和超极化膜电位的变化,两种细胞类型都表现出向外和向内电流的电流激活动力学改变。值得注意的是,KCa3.1、KCa1.1、KCa2.3和Kir6.1通道的表达不受O2的影响,这表明两种EC类型的全细胞电流变化都是由于通道调制引起的。因此,我们的研究结果表明,生理性O2张力通过调节K+通道功能和NO反应性来塑造人类EC的电生理表型。O2对EC K+通道调节的新见解对血管张力的调节以及高通量药物发现和临床翻译的体外实验模型的设计和使用具有重要意义。
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引用次数: 0
Resistance-based training improves mitochondrial capacity and redox balance in aging adults, independent of polyphenol supplementation 基于阻力的训练可改善老年人线粒体能力和氧化还原平衡,无需多酚补充
IF 11.9 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-12-17 DOI: 10.1016/j.redox.2025.103972
Mathias Flensted-Jensen , Cecilie Moe Weinreich , Ann-Sofie Kleis-Olsen , Filip Hansen , Nadia Stenner Skyggelund , Jeppe Rahbek Pii , Ryan Whitlock , Anders Karlsen , Arthur Ingersen , Dace Reihmane , Daniela Weber , Tilman Grune , Olga Pivovarova-Ramich , Flemming Dela
Aging is associated with declines in skeletal muscle function, mitochondrial capacity, and changes in redox balance, which collectively contribute to frailty and chronic disease risk. This study investigated the effects of a 12-week resistance training (RT) program combined with a small dose of high-intensity interval training (HIIT), with or without polyphenol supplementation, on mitochondrial respiratory capacity (MRC) and oxidative stress in middle-aged and older adults (55–70 years). Forty-one participants were randomized to receive either a polyphenol supplement or a placebo for 30 days before the training intervention. Following the training intervention, aerobic capacity, lean mass, and strength improved significantly in both groups. Training also increased MRC in the placebo group but not in the polyphenol group, which displayed higher MRC following the supplementation phase, possibly reflecting either a supplement effect or baseline variation. The training resulted in a 20 % decrease in skeletal muscle H2O2 emission across both groups, suggesting enhanced mitochondrial efficiency or antioxidant defenses. However, gene expression of selected antioxidants was unchanged, and plasma oxidative stress markers malondialdehyde (MDA) increased, and 3-nitrotyrosine (3-NT) remained unchanged. Circulating antioxidants showed distinct changes with training, as ascorbic acid increased with training in both groups, while α-tocopherol increased only in the placebo group and β-cryptoxanthin and retinol declined in the polyphenol group, suggesting potential supplement–nutrient interactions. Uric acid increased in both groups, likely reflecting exercise-induced purine turnover. In conclusion, combined RT and HIIT improved mitochondrial bioenergetics and muscle redox balance in middle-aged and older adults, whereas polyphenol supplementation did not augment these adaptations and may have blunted some vitamin-related responses. These findings underscore resistance-based exercise as a potent intervention for maintaining physical and mitochondrial health with age.
衰老与骨骼肌功能下降、线粒体能力下降和氧化还原平衡变化有关,这些因素共同导致身体虚弱和慢性疾病风险。本研究调查了为期12周的阻力训练(RT)计划与小剂量高强度间歇训练(HIIT)结合,有或没有补充多酚,对中老年人(55-70岁)线粒体呼吸能力(MRC)和氧化应激的影响。41名参与者在训练干预前30天随机接受多酚补充剂或安慰剂。在训练干预后,两组的有氧能力、瘦质量和力量均有显著改善。训练也增加了安慰剂组的MRC,但多酚组没有,多酚组在补充阶段显示出更高的MRC,可能反映了补充效果或基线变化。训练导致两组小鼠骨骼肌H2O2排放减少20% %,表明线粒体效率或抗氧化防御能力增强。然而,所选抗氧化剂的基因表达没有变化,血浆氧化应激标志物丙二醛(MDA)升高,3-硝基酪氨酸(3-NT)保持不变。循环抗氧化剂在训练中表现出明显的变化,抗坏血酸在两组中都随着训练而增加,而α-生育酚仅在安慰剂组中增加,而β-隐黄质和视黄醇在多酚组中下降,这表明可能存在补充营养素的相互作用。尿酸在两组中都有所增加,可能反映了运动引起的嘌呤转换。总之,联合RT和HIIT改善了中老年人的线粒体生物能量和肌肉氧化还原平衡,而多酚补充并没有增强这些适应,可能会减弱一些维生素相关的反应。这些发现强调了以阻力为基础的运动是一种有效的干预措施,可以随着年龄的增长保持身体和线粒体的健康。
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Redox Biology
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