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Biosensors reveal subcellular redox status in live cells 生物传感器揭示活细胞的亚细胞氧化还原状态
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-03-01 Epub Date: 2025-12-20 DOI: 10.1016/j.yjmcc.2025.12.009
Haoqi Li , Huimin Li , Yufan Chao , Yaozhao Li , Zijie Cheng , Yuqing Li , Yun Yin , Tao Chen , Xin Dong , Dan Wu , Qingxun Hu
Redox homeostasis is crucial for cellular function and signaling, with its disruption linked to various diseases. Given the compartment-specific nature of redox regulation, we employed highly responsive genetically encoded fluorescent sensors, including Hyper7, iNap, and roGFP2, to achieve real-time in situ tracking of the redox dynamics of H2O2, NADPH and GSH in the cytoplasm and mitochondria. It revealed that glycolysis and oxidative phosphorylation differentially modulate redox metabolites across subcellular domains, demonstrating metabolic pathway-specific regulation of redox equilibrium. Pathological modeling (cardiac hypertrophy, ischemia-reperfusion and cuproptosis) characterized mitochondrial redox systems exhibit superior stress-responsive regulation versus cytoplasmic counterparts, displaying enhanced dynamic responses during injury progression. These results suggest that precise subcellular redox mapping delivers critical insights into dynamic signal transduction mechanisms and proposes targeted therapeutic avenues for redox-associated pathologies through compartment-specific interventions.
氧化还原稳态对细胞功能和信号传导至关重要,其破坏与各种疾病有关。考虑到氧化还原调控的室特异性,我们采用了高响应的遗传编码荧光传感器,包括Hyper7、iNap和roGFP2,来实现对细胞质和线粒体中H2O2、NADPH和GSH氧化还原动力学的实时原位跟踪。研究表明,糖酵解和氧化磷酸化对氧化还原代谢产物在亚细胞结构域的差异调节,证明了氧化还原平衡的代谢途径特异性调节。病理模型(心脏肥厚、缺血-再灌注和铜变)表征线粒体氧化还原系统表现出优于细胞质对应系统的应激反应调节,在损伤进展过程中表现出增强的动态反应。这些结果表明,精确的亚细胞氧化还原图谱为动态信号转导机制提供了重要见解,并通过区室特异性干预为氧化还原相关病理提供了靶向治疗途径。
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引用次数: 0
Impaired retinoic acid signaling mediated Rbm20 downregulation induces aberrant splicing of CaV1.2 calcium channel: implications in myocardial hypertrophy 视黄酸信号通路受损介导的Rbm20下调诱导CaV1.2钙通道剪接异常:心肌肥大的意义。
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-02-01 Epub Date: 2025-11-20 DOI: 10.1016/j.yjmcc.2025.11.011
Xinyu Song , Dan Yang , Zhe Sun , Shumin Yin , Chenhao Wang , Wei Hou , Yu Sun , Fen Zheng , Juejin Wang

Aims

Myocardial hypertrophy, a pathological adaptation to chronic stress, predisposes to heart failure through dysregulated calcium handling. Alternative splicing (AS) of CaV1.2 calcium channel participates in myocardial hypertrophy, and RNA-binding motif protein 20 (Rbm20) regulates CaV1.2 AS. Moreover, impaired retinoic acid receptor β (RARβ) is implicated in cardiac pathologies, but its roles in handling cardiac intracellular calcium during myocardial hypertrophy remain unknown. Here, we explore whether impaired RARβ exacerbates cardiac pathological remodeling by disrupting Rbm20-mediated CaV1.2 AS.

Methods and results

Transverse aortic constriction (TAC) and isoproterenol (ISO)-induced murine hypertrophic hearts showed increased CaV1.2 alternative exon 9* (CaV1.2E9*), accompanied with reduced Rbm20 expression. Rbm20 downregulated CaV1.2 exon 9* in cardiomyocytes. Bioinformatic analysis of human hypertrophic cardiomyopathy datasets revealed impaired RA signaling, marked by RARβ downregulation, which was confirmed in TAC hearts and ISO-treated neonatal rat ventricular myocytes (NRVMs). RARβ knockdown increased the proportion of CaV1.2E9* channels and K+-triggered intracellular Ca2+ concentration ([Ca2+]i) in NRVMs. Chromatin immunoprecipitation and dual-luciferase assays identified that RARβ directly binds to Rbm20 promoter region, and adapalene (ADP), a selective RARβ agonist, increased their binding affinity. For clinical relevance, ADP restored Rbm20 expression, normalized CaV1.2E9* splicing, decreased K+-triggered [Ca2+]i, and attenuated cardiomyocyte hypertrophy. In vivo, ADP administration alleviated myocardial hypertrophy in TAC mice.

Conclusion

Our findings reveal impaired RARβ drives CaV1.2 aberrant splicing by downregulating Rbm20, establishing a feedforward loop of intracellular calcium imbalances and hypertrophic remodeling. Significantly, ADP restores CaV1.2 AS and intracellular calcium homeostasis by activating RARβ in cardiomyocytes, highlighting a novel therapeutic approach for myocardial hypertrophy.
目的:心肌肥大是对慢性应激的一种病理适应,通过钙处理失调易导致心力衰竭。CaV1.2钙通道的选择性剪接(AS)参与心肌肥厚,rna结合基序蛋白20 (Rbm20)调控CaV1.2 AS。此外,受损的视黄酸受体β (RARβ)与心脏病理有关,但其在心肌肥大过程中处理心脏细胞内钙的作用尚不清楚。在这里,我们探讨受损的RARβ是否通过破坏rbm20介导的CaV1.2 AS而加剧心脏病理重塑。方法和结果:横断主动脉缩窄(TAC)和异丙肾上腺素(ISO)诱导的小鼠肥厚心脏显示CaV1.2替代外显子9* (CaV1.2 e9)升高,Rbm20表达降低。Rbm20下调心肌细胞CaV1.2外显子9*。人类肥厚性心肌病数据集的生物信息学分析显示RA信号受损,以RARβ下调为标志,这在TAC心脏和iso处理的新生大鼠心室肌细胞(nrvm)中得到证实。RARβ敲低增加了nrvm中CaV1.2E9通道的比例和K+触发的细胞内Ca2+浓度([Ca2+]i)。染色质免疫沉淀和双荧光素酶实验发现,RARβ直接结合Rbm20启动子区域,选择性RARβ激动剂阿达帕烯(ADP)增加了它们的结合亲和力。从临床意义上看,ADP恢复了Rbm20的表达,使CaV1.2E9剪接正常化,降低了K+触发的[Ca2+]i,减轻了心肌细胞肥大。体内给药ADP可减轻TAC小鼠心肌肥厚。结论:我们的研究结果表明,受损的RARβ通过下调Rbm20来驱动CaV1.2异常剪接,建立细胞内钙失衡和肥厚重塑的前馈循环。值得注意的是,ADP通过激活心肌细胞中的RARβ来恢复CaV1.2 AS和细胞内钙稳态,这为心肌肥大提供了一种新的治疗方法。
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引用次数: 0
Corrigendum to “Age-related structural and functional changes of the intracardiac nervous system” Journal of Molecular and Cellular Cardiology, Volume 187 (2024) 1–14] “与年龄相关的心内神经系统结构和功能变化”的勘误表《分子和细胞心脏病学杂志》,187卷(2024)1-14]。
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-02-01 Epub Date: 2025-12-09 DOI: 10.1016/j.yjmcc.2025.11.010
Eliza Sassu , Gavin Tumlinson , Dragana Stefanovska , Marbely C. Fernández , Pia Iaconianni , Josef Madl , Tomás A. Brennan , Manuel Koch , Breanne A. Cameron , Sebastian Preissl , Ursula Ravens , Franziska Schneider-Warme , Peter Kohl , Callum M. Zgierski-Johnston , Luis Hortells
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引用次数: 0
Cyclic AMP-dependent regulation of ryanodine receptors in healthy and diseased hearts 健康和患病心脏中ryanodine受体的环amp依赖性调节。
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-02-01 Epub Date: 2025-11-24 DOI: 10.1016/j.yjmcc.2025.11.013
Mohit M. Hulsurkar , Isabelle Ong , Joshua A. Keefe , Issam H. Abu-Taha , Dobromir Dobrev , Xander H.T. Wehrens
Cyclic adenosine monophosphate (cAMP) is a critical second messenger in cardiomyocytes, regulating essential cellular functions. Upon G-protein-coupled receptor stimulation, adenylyl cyclase (AC) synthesizes cAMP, which phosphodiesterase (PDE) enzymes subsequently degrade. Recent studies challenge the traditional view of uniform cAMP signaling, revealing nanodomain-specific regulation within cardiomyocytes. This localized cAMP signaling modulates key Ca2+-handling proteins, including ryanodine receptor type-2 (RyR2), through channel-bound protein kinases and PDEs. Additionally, nucleoside-diphosphate kinases (NDPKs), particularly NDPK-C, contribute to cAMP synthesis and RyR2 regulation. Elevated NDPK-C levels in failing hearts correlate with increased cAMP levels, enhanced sarcoplasmic reticulum Ca2+ release, and cardiac arrhythmias. Furthermore, cAMP influences the expression of Ca2+-handling proteins. This review examines the mechanisms governing cAMP levels in the sarcoplasmic reticulum nanodomain and their role in regulating RyR2 function in healthy and diseased hearts.
环腺苷一磷酸(cAMP)是心肌细胞中关键的第二信使,调节基本细胞功能。在g蛋白偶联受体刺激下,腺苷酸环化酶(AC)合成cAMP,随后磷酸二酯酶(PDE)降解cAMP。最近的研究挑战了统一cAMP信号的传统观点,揭示了心肌细胞内纳米结构域特异性调控。这种定位的cAMP信号通过通道结合蛋白激酶和pde调节关键的Ca2+处理蛋白,包括RyR2 (RyR2)。此外,核苷二磷酸激酶(ndpk),特别是NDPK-C,参与cAMP合成和RyR2调控。心力衰竭患者NDPK-C水平升高与cAMP水平升高、肌浆网Ca2+释放增强和心律失常相关。此外,cAMP影响Ca2+处理蛋白的表达。本文综述了肌浆网纳米结构域cAMP水平的调控机制及其在健康和患病心脏中调节RyR2功能的作用。
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引用次数: 0
Sphingosine-1-phosphate activates ICl,swell in ventricular myocytes via mitochondrial reactive oxygen production 鞘氨醇-1-磷酸通过线粒体活性氧产生激活心室肌细胞的ICl、肿胀。
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-02-01 Epub Date: 2025-11-19 DOI: 10.1016/j.yjmcc.2025.11.009
Frank J. Raucci , Adolfo G. Mauro , Edward J. Lesnefsky , Clive M. Baumgarten
<div><h3>Aims</h3><div>We previously demonstrated that bacterial sphingomyelinase (SMase), which converts plasmalemmal sphingomyelin to long-chain ceramides, activates the swelling-activated chloride current (<em>I</em><sub><em>Cl,swell</em></sub>) in rabbit ventricular myocytes in a reactive oxygen (ROS)-dependent manner under isosmotic conditions. Ceramides can be converted to sphingosine by ceramidase and, in turn, phosphorylated by sphingosine kinase to yield sphingosine-1-phosphate (S1P), which binds to multiple cytoplasmic targets and activates S1P receptors via inside-out transport. This study was designed to determine the cellular source of ROS production elicited by SMase, the sphingolipid species responsible, and thereby, the mechanism of activation of <em>I</em><sub><em>Cl,swell</em></sub> by sphingolipids.</div></div><div><h3>Methods and results</h3><div>Whole-cell patch clamp experiments were conducted using freshly isolated rabbit ventricular myocytes. Inhibition of ceramidase with D-<em>erythro</em>-MAPP, which increases the concentration of endogenous ceramides in the cell membrane, prevented activation of <em>I</em><sub><em>Cl,swell</em></sub> upon exposure to SMase. Similarly, inhibition of sphingosine kinase with DL-<em>threo</em>-dihydrosphingosine to prevent SIP formation by phosphorylation of sphingosine also completely inhibited SMase-induced Cl<sup>−</sup> current. In contrast, addition of S1P to the bath solution elicited <em>I</em><sub><em>Cl,swell</em></sub>. ROS generated by both NADPH oxidase 2 (NOX2) and mitochondria previously were implicated in triggering <em>I</em><sub><em>Cl,swell</em></sub>. SMase-induced <em>I</em><sub><em>Cl,swell</em></sub> activation was abrogated by blocking mitochondrial electron transport at Complex I with rotenone but was insensitive to blockade of NOX2 with either apocynin or gp91ds-tat. Moreover, diazoxide, which augments mitochondrial ROS production, evoked <em>I</em><sub><em>Cl,swell</em></sub>, and 5-HD, an inhibitor of this pathway, reversed the SMase and diazoxide-induced currents. Flow cytometry using C-H<sub>2</sub>DCFDA-AM to assess cytoplasmic ROS in HL-1 myocytes confirmed the effects of the interventions on ROS production.</div></div><div><h3>Conclusions</h3><div>Taken together, these data suggest S1P is the sphingolipid that triggers <em>I</em><sub><em>Cl,swell</em></sub> in cardiomyocyte, and activation of <em>I</em><sub><em>Cl,swell</em></sub> by SMase and S1P is due to ROS produced by mitochondria and appears independent of NOX2.</div></div><div><h3>Translational perspective</h3><div><em>I</em><sub><em>Cl,swell</em></sub> modulates apoptosis, cell volume, action potential duration, and participation in mechanoelectrical feedback in cardiomyocytes. Persistent activation of <em>I</em><sub><em>Cl,swell</em></sub> is seen in several forms of cardiac disease, including dilated cardiomyopathy [<span><span>1</span></span>] and models of heart failure [<span><span>2</span></span
目的:我们之前已经证明,细菌鞘磷脂酶(SMase)可以将血浆鞘磷脂转化为长链神经酰胺,在等渗条件下以活性氧(ROS)依赖的方式激活兔心室肌细胞中肿胀激活的氯电流(ICl,肿胀)。神经酰胺可以通过神经酰胺酶转化为鞘氨醇,然后通过鞘氨醇激酶磷酸化生成鞘氨醇-1-磷酸(S1P),其结合多个细胞质靶点并通过内向外运输激活S1P受体。本研究旨在确定由鞘脂类SMase引起的ROS产生的细胞来源,从而确定鞘脂激活ICl、膨胀的机制。方法和结果:采用新鲜分离的兔心室肌细胞进行全细胞膜片钳实验。用d - red - mapp抑制神经酰胺酶,增加细胞膜内源性神经酰胺的浓度,阻止暴露于SMase后ICl的激活和肿胀。同样,用dl -三氢鞘氨醇抑制鞘氨醇激酶,通过鞘氨醇磷酸化阻止SIP的形成,也完全抑制了smase诱导的Cl-电流。相反,在浴液中加入S1P会引起ICl,膨胀。由NADPH氧化酶2 (NOX2)和线粒体产生的ROS先前涉及触发ICl,肿胀。smase诱导的ICl,肿胀激活可以通过鱼藤酮阻断复合物I的线粒体电子传递来消除,但对夹带素或gp91ds-tat阻断NOX2不敏感。此外,增加线粒体ROS产生的二氮氧化物,可诱发ICl、swell和5-HD(该途径的抑制剂),逆转SMase和二氮氧化物诱导的电流。使用C-H2DCFDA-AM流式细胞术评估HL-1肌细胞的细胞质ROS,证实了干预对ROS产生的影响。结论:综上所述,这些数据表明S1P是触发心肌细胞ICl、肿胀的鞘脂,SMase和S1P对ICl、肿胀的激活是由于线粒体产生的ROS,并且与NOX2无关。翻译角度:ICl,肿胀调节心肌细胞的凋亡,细胞体积,动作电位持续时间和参与机电反馈。ICl持续激活,肿胀可见于多种心脏疾病,包括扩张型心肌病[1]和心力衰竭模型[2]。此外,它还与代谢综合征和随后的2型糖尿病(DM2)发展有关。这意味着一种复杂的关系,其中可能既有对受损心肌细胞的直接影响,也有对心血管系统的间接影响,导致慢性细胞应激,如在DM2中所见。该报告首次证明,S1P通过破坏线粒体呼吸链导致ROS释放来增强心肌细胞的ICl、肿胀激活。这为治疗以鞘脂代谢改变为特征的扩张型心肌病或代谢综合征等心血管疾病提供了潜在的治疗靶点。
{"title":"Sphingosine-1-phosphate activates ICl,swell in ventricular myocytes via mitochondrial reactive oxygen production","authors":"Frank J. Raucci ,&nbsp;Adolfo G. Mauro ,&nbsp;Edward J. Lesnefsky ,&nbsp;Clive M. Baumgarten","doi":"10.1016/j.yjmcc.2025.11.009","DOIUrl":"10.1016/j.yjmcc.2025.11.009","url":null,"abstract":"&lt;div&gt;&lt;h3&gt;Aims&lt;/h3&gt;&lt;div&gt;We previously demonstrated that bacterial sphingomyelinase (SMase), which converts plasmalemmal sphingomyelin to long-chain ceramides, activates the swelling-activated chloride current (&lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt;) in rabbit ventricular myocytes in a reactive oxygen (ROS)-dependent manner under isosmotic conditions. Ceramides can be converted to sphingosine by ceramidase and, in turn, phosphorylated by sphingosine kinase to yield sphingosine-1-phosphate (S1P), which binds to multiple cytoplasmic targets and activates S1P receptors via inside-out transport. This study was designed to determine the cellular source of ROS production elicited by SMase, the sphingolipid species responsible, and thereby, the mechanism of activation of &lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt; by sphingolipids.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Methods and results&lt;/h3&gt;&lt;div&gt;Whole-cell patch clamp experiments were conducted using freshly isolated rabbit ventricular myocytes. Inhibition of ceramidase with D-&lt;em&gt;erythro&lt;/em&gt;-MAPP, which increases the concentration of endogenous ceramides in the cell membrane, prevented activation of &lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt; upon exposure to SMase. Similarly, inhibition of sphingosine kinase with DL-&lt;em&gt;threo&lt;/em&gt;-dihydrosphingosine to prevent SIP formation by phosphorylation of sphingosine also completely inhibited SMase-induced Cl&lt;sup&gt;−&lt;/sup&gt; current. In contrast, addition of S1P to the bath solution elicited &lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt;. ROS generated by both NADPH oxidase 2 (NOX2) and mitochondria previously were implicated in triggering &lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt;. SMase-induced &lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt; activation was abrogated by blocking mitochondrial electron transport at Complex I with rotenone but was insensitive to blockade of NOX2 with either apocynin or gp91ds-tat. Moreover, diazoxide, which augments mitochondrial ROS production, evoked &lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt;, and 5-HD, an inhibitor of this pathway, reversed the SMase and diazoxide-induced currents. Flow cytometry using C-H&lt;sub&gt;2&lt;/sub&gt;DCFDA-AM to assess cytoplasmic ROS in HL-1 myocytes confirmed the effects of the interventions on ROS production.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Conclusions&lt;/h3&gt;&lt;div&gt;Taken together, these data suggest S1P is the sphingolipid that triggers &lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt; in cardiomyocyte, and activation of &lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt; by SMase and S1P is due to ROS produced by mitochondria and appears independent of NOX2.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Translational perspective&lt;/h3&gt;&lt;div&gt;&lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt; modulates apoptosis, cell volume, action potential duration, and participation in mechanoelectrical feedback in cardiomyocytes. Persistent activation of &lt;em&gt;I&lt;/em&gt;&lt;sub&gt;&lt;em&gt;Cl,swell&lt;/em&gt;&lt;/sub&gt; is seen in several forms of cardiac disease, including dilated cardiomyopathy [&lt;span&gt;&lt;span&gt;1&lt;/span&gt;&lt;/span&gt;] and models of heart failure [&lt;span&gt;&lt;span&gt;2&lt;/span&gt;&lt;/span","PeriodicalId":16402,"journal":{"name":"Journal of molecular and cellular cardiology","volume":"211 ","pages":"Pages 18-27"},"PeriodicalIF":4.7,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145564211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Human atrial skinned muscle fibers exhibit reduced length-dependent activation but show faster force development kinetics than ventricular muscle 人心房皮肌纤维表现出减少的长度依赖性激活,但表现出比心室肌更快的力量发展动力学。
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-02-01 Epub Date: 2025-12-04 DOI: 10.1016/j.yjmcc.2025.12.001
Alexandre Lewalle , Gregory Milburn , Jania Bell , Kenneth S. Campbell , Steven A. Niederer
In humans, the left atria (LA) and the left ventricle (LV) play distinct physiological roles and express sarcomeric proteins with chamber-specific patterns. Despite these important differences, most multi-chamber descriptions of the heart assume uniform myocardial properties. To facilitate a more accurate representation of cardiac function, we measured and compared the contractile properties of isolated skinned human LA and LV muscle fibers at 37 °C. Our experimental measurements included the length-dependent activation (LDA) of force in the isometric steady state, the force response to small quick length changes, and tension redevelopment dynamics. The LV measurements display more pronounced LDA behavior compared to LA, whereas the LA dynamics is generally faster than LV.
To elucidate these differences mechanistically, we used the LA and LV experimental datasets to fit a biophysical model framework to produce a representative model for each chamber. Our Bayesian statistical approach aimed to maximize the objectivity of the model calibrations and to allow a systematic assessment of chamber-specific parameter differences. Passive mechanical properties emerge as the principal determinant of LDA behavior. However, variations in cross-bridge cycling kinetics account more significantly for LA/LV differences in the ATP consumption to produce a given isometric force.
These results constitute the first systematic biophysical comparison of LA and LV cardiomyocyte contraction mechanics in humans, paving the way to further investigation of their roles within the broader cardiovascular physiological context.
在人类中,左心房(LA)和左心室(LV)发挥着不同的生理作用,并表达具有腔室特异性模式的肌肉蛋白。尽管存在这些重要的差异,大多数对心脏的多腔室描述都假定心肌的特性是一致的。为了更准确地表示心功能,我们测量并比较了37°C下皮肤分离的人左室和左室肌肉纤维的收缩特性。我们的实验测量包括等距稳定状态下力的长度相关激活(LDA),小的快速长度变化的力响应以及张力再开发动态。LV测量结果显示出比LA更明显的LDA行为,而LA动力学通常比LV更快。为了从机制上阐明这些差异,我们使用LA和LV实验数据集拟合生物物理模型框架,为每个腔室生成具有代表性的模型。我们的贝叶斯统计方法旨在最大限度地提高模型校准的客观性,并允许对腔室特定参数差异进行系统评估。被动力学性能成为LDA行为的主要决定因素。然而,跨桥循环动力学的变化更显著地解释了产生给定等距力的ATP消耗的LA/LV差异。这些结果构成了人类左心室和左心室心肌细胞收缩机制的第一个系统的生物物理比较,为进一步研究它们在更广泛的心血管生理背景下的作用铺平了道路。
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引用次数: 0
Galangin alleviates cardiac ischemia/reperfusion injury in human iPSC-derived cardiomyocytes and animal models 高良姜可减轻人ipsc源性心肌细胞和动物模型的心肌缺血/再灌注损伤。
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-02-01 Epub Date: 2025-12-05 DOI: 10.1016/j.yjmcc.2025.12.003
Yongjun Wang , Shane R. Zhao , Dong Han , Wenshu Zeng , Mohamed Rafiuddin Ahmed , Xulei Qin , Qiang Liu , Joe Z. Zhang , Jayakumar Rajadas , Joseph C. Wu
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引用次数: 0
Corrigendum to ‘FABP4, marker of worse prognosis in cardiovascular disease, induces neutrophil’s proatherogenic phenotype which is modulated by semaglutide’ [Journal of Molecular and Cellular Cardiology volume 210 (2026) 12–27] “FABP4,心血管疾病预后较差的标志物,诱导中性粒细胞的促动脉粥样硬化表型,这是由semaglutide调节的”[Journal of Molecular and Cellular Cardiology vol 210(2026) 12-27]的更正。
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-02-01 Epub Date: 2025-12-03 DOI: 10.1016/j.yjmcc.2025.11.015
David Sánchez-López , David García-Vega , J.E. Viñuela , Isabel Ferreirós-Vidal , Diego Iglesias-Álvarez , José Manuel Martínez-Cereijo , Laura Reija-López , Ángel L. Fernández-González , José R. González-Juanatey , Sonia Eiras
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引用次数: 0
Corrigendum to ‘Small-scale siRNA screen reveals WWC2 as a novel regulator of cardiomyocyte mitosis’ [Journal of Molecular and Cellular Cardiology 210 (2025) 127–136] “小规模siRNA筛选显示WWC2是心肌细胞有丝分裂的新调节剂”的勘误表[Journal of Molecular and Cellular Cardiology 210(2025) 127-136]。
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-02-01 Epub Date: 2025-12-21 DOI: 10.1016/j.yjmcc.2025.12.007
Dogacan Yücel , Calvin Smith , Natalia Ferreira de Araujo , Fernando Souza-Neto , Upendra Chalise , Grace Schuler , Bayardo I. Garay , Jennifer L. Mikkila , Omar Atef Abdelhamid Mahmoud , Pratima Mandal , Verena Höffken , Joachim Kremerskothen , Rita C.R. Perlingeiro , Jop H. van Berlo
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引用次数: 0
Central regulation of the heart in type 2 diabetes mellitus 2型糖尿病患者心脏的中枢调节。
IF 4.7 2区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Pub Date : 2026-02-01 Epub Date: 2025-11-19 DOI: 10.1016/j.yjmcc.2025.11.012
Shivani Sethi , Isaiah Cheong , Carol T. Bussey , Daryl O. Schwenke , Jeffrey R. Erickson , Colin H. Brown , Regis R. Lamberts
Diabetic heart disease is a leading cause of morbidity and mortality in individuals with type 2 diabetes mellitus (T2DM). A major yet frequently under-recognized component of diabetic heart disease is cardiac autonomic neuropathy (CAN), a condition characterized by dysregulated sympathetic and parasympathetic drive to the heart.
Current pharmacological treatments for diabetic CAN are often ineffective, having been extrapolated from other health conditions. These therapies predominantly target the peripheral symptoms of elevated sympathetic activity, whilst largely neglecting its origins in sympathoexcitatory regions of the central autonomic network. Sympathetic control of cardiac function originates from the hypothalamus, medulla oblongata, midbrain, and pons, and is relayed through the intermediolateral cell column of the thoracic spinal cord and the intrinsic cardiac nervous system. Targeting the central autonomic network to modulate cardiac sympathetic drive presents a promising novel therapeutic avenue for the treatment of diabetic CAN.
This review briefly summarizes established knowledge regarding the pathophysiology and management of diabetic CAN, and the implications of recent findings of increased neuronal activation in central sympathoregulatory regions early in the development of T2DM. Increased cardiac sympathetic in the intital stages of T2DM might represent a novel therapeutic target to reduce the impact of CAN and thereby improve outcomes in patients with T2DM.
糖尿病性心脏病是2型糖尿病(T2DM)患者发病和死亡的主要原因。糖尿病性心脏病的一个主要但经常被忽视的组成部分是心脏自主神经病变(CAN),这是一种以交感和副交感神经驱动失调为特征的疾病。目前的药物治疗糖尿病CAN往往是无效的,已经从其他健康状况推断。这些疗法主要针对交感神经活动升高的外周症状,而在很大程度上忽视了其起源于中央自主神经网络的交感神经兴奋区。交感神经对心功能的控制起源于下丘脑、延髓、中脑和脑桥,并通过胸脊髓的中外侧细胞柱和心脏固有神经系统传递。靶向中枢自主神经网络调节心脏交感神经驱动为糖尿病性CAN的治疗提供了一条有前景的新途径。这篇综述简要总结了关于糖尿病CAN的病理生理学和治疗的现有知识,以及最近发现的在T2DM发展早期中央交感神经调节区神经元激活增加的意义。在T2DM的初始阶段增加心脏交感神经可能是一种新的治疗靶点,可以减少CAN的影响,从而改善T2DM患者的预后。
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Journal of molecular and cellular cardiology
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