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S-acylation of Ca^(2+)transport proteins in cancer
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作者 Sana Kouba Nicolas Demaurex 《Chronic Diseases and Translational Medicine》 CAS CSCD 2024年第4期263-280,共18页
Alterations in cellular calcium(Ca^(2+))signals have been causally associated with the development and progression of human cancers.Cellular Ca^(2+)signals are generated by channels,pumps,and exchangers that move Ca^(... Alterations in cellular calcium(Ca^(2+))signals have been causally associated with the development and progression of human cancers.Cellular Ca^(2+)signals are generated by channels,pumps,and exchangers that move Ca^(2+)ions across membranes and are decoded by effector proteins in the cytosol or in organelles.S-acylation,the reversible addition of 16-carbon fatty acids to proteins,modulates the activity of Ca^(2+)transporters by altering their affinity for lipids,and enzymes mediating this reversible post-translational modification have also been linked to several types of cancers.Here,we compile studies reporting an association between Ca^(2+)transporters or S-acylation enzymes with specific cancers,as well as studies reporting or predicting the S-acylation of Ca^(2+)transporters.We then discuss the potential role of S-acylation in the oncogenic potential of a subset of Ca^(2+)transport proteins involved in cancer. 展开更多
关键词 Ca^(2+)signaling Ca^(2+)transport proteins CANCER S-ACYLATION S-palmitoylation
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Tale of two kinases:Protein kinase A and Ca^(2+)/calmodulin-dependent protein kinase Ⅱ in pre-diabetic cardiomyopathy
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作者 Pamela Gaitán-González Rommel Sánchez-Hernández +1 位作者 José-Antonio Arias-Montaño Angélica Rueda 《World Journal of Diabetes》 SCIE 2021年第10期1704-1718,共15页
Metabolic syndrome is a pre-diabetic state characterized by several biochemical and physiological alterations,including insulin resistance,visceral fat accumulation,and dyslipidemias,which increase the risk for develo... Metabolic syndrome is a pre-diabetic state characterized by several biochemical and physiological alterations,including insulin resistance,visceral fat accumulation,and dyslipidemias,which increase the risk for developing cardiovascular disease.Metabolic syndrome is associated with augmented sympathetic tone,which could account for the etiology of pre-diabetic cardiomyopathy.This review summarizes the current knowledge of the pathophysiological consequences of enhanced and sustainedβ-adrenergic response in pre-diabetes,focusing on cardiac dysfunction reported in diet-induced experimental models of pre-diabetic cardiomyopathy.The research reviewed indicates that both protein kinase A and Ca^(2+)/calmodulin-dependent protein kinase Ⅱ play important roles in functional responses mediated byβ1-adrenoceptors;therefore,alterations in the expression or function of these kinases can be deleterious.This review also outlines recent information on the role of protein kinase A and Ca^(2+)/calmodulin-dependent protein kinase Ⅱ in abnormal Ca^(2+)handling by cardiomyocytes from diet-induced models of pre-diabetic cardiomyopathy. 展开更多
关键词 Ca^(2+)/calmodulin-dependent protein kinase II protein kinase A Metabolic syndrome PRE-DIABETES Pre-diabetic cardiomyopathy β-Adrenoceptors
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卡托普利对慢性房颤实验犬心房肌Ca^(2+)调控蛋白基因表达的影响 被引量:1
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作者 李建平 张薇 +4 位作者 黎莉 王苏加 杨贵荣 苗雅 张运 《山东大学学报(医学版)》 CAS 北大核心 2005年第10期889-892,共4页
目的:探讨卡托普利对慢性房颤(atrial fibrillation,AF)实验犬心房肌Ca2+调控蛋白基因表达的影响。方法:随机将26只健康杂种犬分为3组:对照组(6只)饲养8周,未作其他处置;起搏组(11只)及治疗组(9只)安置埋藏式高频率心脏起搏器(400bpm),... 目的:探讨卡托普利对慢性房颤(atrial fibrillation,AF)实验犬心房肌Ca2+调控蛋白基因表达的影响。方法:随机将26只健康杂种犬分为3组:对照组(6只)饲养8周,未作其他处置;起搏组(11只)及治疗组(9只)安置埋藏式高频率心脏起搏器(400bpm),快速起搏犬右心耳8周,治疗组于起搏前3d至起搏8周,每日给予卡托普利50mg2次/d。然后从右心房取材,测定心房肌细胞内Ca2+浓度,RTPCR方法检测细胞膜L型Ca2+通道及肌浆网钙泵(SRCa2+ATPase)mRNA表达。结果:8周后,对照组、起搏组、治疗组心房肌细胞内Ca2+浓度(μg·ml-1)分别为:24.06±3.51、35.32±4.88、25.44±4.19,起搏组细胞内Ca2+浓度明显增加(P<0.01);三组细胞膜L型Ca2+通道mRNA表达量分别为:0.27±0.03、0.20±0.03、0.33±0.04,起搏组mRNA表达量减少,而治疗组mRNA表达量明显增高,与对照组及起搏组比较P<0.05~0.001;三组SRCa2+ATPasemRNA表达量分别为:0.21±0.01、0.24±0.07、0.41±0.08,治疗组mRNA表达明显上调(P<0.001)。结论:实验犬快速起搏8周后,心房肌细胞内Ca2+超负荷,细胞膜L型Ca2+通道mRNA表达明显下调,SRCa2+ATPasemRNA表达无明显变化;卡托普利干预治疗可使细胞膜L型Ca2+通道及SRCa2+ATPasemRNA表达明显上调,从而抑制细胞内Ca2+超载。 展开更多
关键词 卡托普利 心房勤动 Ca^2+调控蛋白 基因表达 CA^2+超载
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心房颤动患者心房肌Ca^(2+)调控蛋白基因的表达变化
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作者 张学义 张薇 +2 位作者 钟明 葛志明 张运 《山东大学学报(医学版)》 CAS 2003年第3期253-256,259,共5页
目的:探讨心房肌细胞内Ca2+超负荷及Ca2+调控蛋白在心房颤动(AF)时心房肌电重构中的作用。方法:测定10例慢性AF患者和6例对照组心房肌细胞内Ca2+含量和细胞膜L型Ca2+通道、肌浆网钙泵、磷酸受纳蛋白、兰尼硷受体和肌集钙蛋白的mRNA和蛋... 目的:探讨心房肌细胞内Ca2+超负荷及Ca2+调控蛋白在心房颤动(AF)时心房肌电重构中的作用。方法:测定10例慢性AF患者和6例对照组心房肌细胞内Ca2+含量和细胞膜L型Ca2+通道、肌浆网钙泵、磷酸受纳蛋白、兰尼硷受体和肌集钙蛋白的mRNA和蛋白质表达。结果:与对照组比较,AF患者心房肌细胞内Ca2+含量提高4.4倍;细胞膜L型Ca2+通道mRNA表达下调33%;肌浆网钙泵mRNA和蛋白质表达分别减低34%和27%;兰尼硷受体mRNA下调21%(P<0.05~0.001);磷酸受纳蛋白mRNA和蛋白质表达及肌集钙蛋白的mRNA表达差异无统计学意义(P>0.05)。结论:频率相关的细胞内Ca2+超负荷可能是AF电重构的始动因素,心房肌Ca2+调控蛋白异常是Ca2+超负荷的分子生物学机制,在AF的发生和发展中起重要作用。 展开更多
关键词 心房颤动 CA2+ 调控蛋白 基因表达
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11,12-环氧二十碳三烯酸对缺血前和再灌注前大鼠心肌钙调节蛋白的影响 被引量:1
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作者 王艳霞 曾翔俊 +7 位作者 芦玲巧 马立权 蒋东桥 穆晶 王晓燕 张立克 唐朝枢 郝刚 《中国医学科学院学报》 CAS CSCD 北大核心 2007年第6期787-791,共5页
目的观察11,12-环氧二十碳三烯酸(11,12-EET)预处理与后处理对缺血/再灌注(IR)大鼠心肌钙调节蛋白的影响,探讨11,12-EET心肌保护的作用及其机制。方法采用Langendorff离体灌流装置,通过停灌40min/复灌30min复制大鼠心肌IR损伤模型。将3... 目的观察11,12-环氧二十碳三烯酸(11,12-EET)预处理与后处理对缺血/再灌注(IR)大鼠心肌钙调节蛋白的影响,探讨11,12-EET心肌保护的作用及其机制。方法采用Langendorff离体灌流装置,通过停灌40min/复灌30min复制大鼠心肌IR损伤模型。将33只雄性Sprague-Dawley大鼠随机分为对照组、IR组、EET预处理组(Pre-EET)及EET后处理组(Post-EET)。采用BL-420生物信号采集系统监测心功能,比色法检测肌浆网Ca2+-ATPase变化,半定量RT-PCR方法检测钙泵(SERCA)、磷酸受纳蛋白(PLB)、兰尼碱受体2型(RyR2)及1,4,5-三磷酸肌醇受体2型(IP3R2)表达变化。结果Pre-EET及Post-EET组与IR组相比,心功能改善、Ca2+-ATPase活性增高(P<0.05,P<0.01);IP3R2表达增强,PLB表达降低(P<0.05,P<0.01);Pre-EET组SERCA表达增强(P<0.05)。Pre-EET与Post-EET组间差异无显著性;各组RyR2表达差异无显著性。结论11,12-EET预处理与后处理具有拮抗IR损伤的作用,这与其诱导肌浆网IP3R2表达上调,PLB表达下调以及改善Ca2+-ATPase的活性有关;同时,预处理肌浆网SERCA表达上调,也可能是其抗IR损伤机制之一。 展开更多
关键词 11 12-环氧二十碳三烯酸 缺血/再灌注损伤 钙调节蛋白 预处理 后处理
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HCV通过抑制T细胞IL-2分泌逃避人体免疫机制的实验研究 被引量:5
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作者 刁骋 《沈阳医学院学报》 2005年第1期8-10,共3页
目的:探讨丙型肝炎病毒(hepatitisCvirus,HCV)抑制T细胞IL-2分泌的机制,为预防、诊断和治疗丙型肝炎提供新思路。方法:利用卟啉醇肉豆蔻酸乙酸酯(phorobol12-myristate13-acetate,PMA)、植物血凝素(phyto-haemagglutinin,PHA)、Ca2+以及... 目的:探讨丙型肝炎病毒(hepatitisCvirus,HCV)抑制T细胞IL-2分泌的机制,为预防、诊断和治疗丙型肝炎提供新思路。方法:利用卟啉醇肉豆蔻酸乙酸酯(phorobol12-myristate13-acetate,PMA)、植物血凝素(phyto-haemagglutinin,PHA)、Ca2+以及抗CD3抗体(OrthoKungTcell3,OKT3)、抗CD81单克隆抗体以及HCV表面蛋白(envelopeproteinofHCV,EP)刺激jurkatT细胞,采用ELISA方法检测培养液中IL-2的产生量并讨论。结果:单独采用PMA和PHA,PHA和Ca2+,OKT3和抗CD81单克隆抗体刺激jurkatT细胞24h,会产生大量的IL-2。如果在采用上述刺激之前,分别使用抗CD81单克隆抗体或EP预处理jurkatT细胞1h,则在上述刺激之后IL-2的产量明显减少。结论:由于EP可与CD81分子特异结合,可以说明HCVEP通过T细胞表面的CD81分子抑制了IL-2的分泌,导致免疫功能受损。 展开更多
关键词 IL-2 T细胞 人体免疫机制 HCV 实验研究 分泌 抑制 卟啉醇肉豆蔻酸乙酸酯 jurkat CD81分子 单克隆抗体 protein ELISA方法 Ca^2+ 逃避 丙型肝炎病毒 抗CD3抗体 免疫功能受损 诊断和治疗 植物血凝素 表面蛋白 OKT3 特异结合
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Cardioprotective Effects of Qishen Granule(芪参颗粒)on Sarcoplasmic Reticulum Ca^2+ Handling in Heart Failure Rats 被引量:8
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作者 LU Ling-hui LI Chun +5 位作者 WANG Qi-yan ZHANG Qian ZHANG Yi MENG Hui WANG Yong WANG Wei 《Chinese Journal of Integrative Medicine》 SCIE CAS CSCD 2017年第7期510-517,共8页
Objective:To assess the effects of Qishen Granule(芪参颗粒, QSG) on sarcoplasmic reticulum(SR) Ca^2+ handling in heart failure(HF) model of rats and to explore the underlying molecular mechanisms. Methods:HF ... Objective:To assess the effects of Qishen Granule(芪参颗粒, QSG) on sarcoplasmic reticulum(SR) Ca^2+ handling in heart failure(HF) model of rats and to explore the underlying molecular mechanisms. Methods:HF rat models were induced by left anterior descending coronary artery ligation surgery and high-fat diet feeding. Rats were randomly divided into sham(n=10), model(n=10), QSG(n=12, 2.2 g/kg daily) and metoprolol groups(n=12, 10.5 mg/kg daily). The therapeutic effects of QSG were evaluated by echocardiography and blood lipid testing. Intracellular Ca^2+ concentration and sarco-endoplasmic reticulum ATPase 2a(SERCA2a) activity were detected by specific assay kits. Expressions of the critical regulators in SR Ca^2+ handling were evaluated by Western blot and real-time quantitative polymerase chain reaction. Results:HF model of rats developed ventricular remodeling accompanied with calcium overload and defective Ca^2+ releaseuptake cycling in cardiomyocytes. Treatment with QSG improved contractive function, attenuated ventricular remodeling and reduced the basal intracellular Ca^2+ level. QSG prevented defective Ca^2+ leak by attenuating hyperphosphorylation of ryanodine receptor 2, inhibiting expression of protein kinase A and up-regulating transcriptional expression of protein phosphatase 1. QSG also restored Ca^2+ uptake by up-regulating expression and activity of SERCA2 a and promoting phosphorylation of phospholamban. Conclusion:QSG restored SR Ca^2+cycling in HF rats and served as an ideal alternative drug for treating HF. 展开更多
关键词 Qishen Granule Ca^2 handling heart failure ryanodine receptor 2 sarco-endoplasmic reticulum ATPase 2a Chinese medicine
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Occurrence of cGMP/nitric oxide-sensitive store-operated calcium entry in fibroblasts and its effect on matrix metalloproteinase secretion 被引量:1
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作者 Yong Huang Min-Qiang Lu Hua Li Chi Xu Shu-Hong Yi Gui-Hua Chen 《World Journal of Gastroenterology》 SCIE CAS CSCD 2006年第34期5483-5489,共7页
AIM: To examine the existence of Nitric oxide/ cGMP sensitive store-operated Ca^2+ entry in mouse fibroblast NIH/3T3 cells and its influence on matrix metalloproteinase (MMP) production and adhesion ability of fib... AIM: To examine the existence of Nitric oxide/ cGMP sensitive store-operated Ca^2+ entry in mouse fibroblast NIH/3T3 cells and its influence on matrix metalloproteinase (MMP) production and adhesion ability of fibroblasts. METHODS: NIH/3T3 cells were cultured. Confocal laser scanning microscopy was used to examine the existence of thapsigargin-induced store-operated Ca^2+ entry in fibroblasts. Gelatin zymography and semiquantitative reverse transcriptase-polymerase chain reaction (RTPCR) were employed to detect the involvement of [Ca^2+]i and NO/cGMP in MMP secretion. The involvement of NO/ cGMP-sensitive Ca^2+ entry in adhesion was determined using matrigel-coated culture plates. RESULTS: 8-bromo-cGMP inhibited the thapsigargin-induced Ca^2+ entry in 3T3 cells. The cGMP-induced inhibition was abolished by an inhibitor of protein kinase G, KT5823 (1μmol/L). A similar effect on the Ca^2+ entry was observed in 3T3 cells in response to a NO donor, (±)-S-nitroso-N-acetylpenicillamine (SNAP). The inhibitory effect of SNAP on the thapsigargin-induced Ca^2+ entry was also observed, indicating NO/cGMP-regulated Ca^2+ entry in 3T3 cells. Results of gelatin zymography assay showed that addition of extracellular Ca^2+ concentration induced MMP release and activation in a dose-dependent manner. RT-PCR also showed that cGMP and SNAP reduced the production of MMP mRNA in 3T3 cells. Experiments investigating adhesion potentials demonstrated that cGMP and SNAP could upgrade 3T3 cell attachment rate to the matrigel-coated culture plates.CONCLUSION: NO/cGMP sensitive store-operated Ca^2+ entry occurs in fibroblasts, and attenuates their adhesion potentials through its influence on MMP secretion. 展开更多
关键词 CGMP Nitric oxide protein kinase G Storeoperated Ca^2 entry Matrix metalloproteinase FIBROBLAST
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Overexpression of Arabidopsis thaliana cysteine2/histidine2-type transcription factor 6 gene enhances plant resistance to a bacterial pathogen
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作者 Wei Tang Anna Y.Tang 《Journal of Forestry Research》 SCIE CAS CSCD 2021年第1期249-262,共14页
Transcription factors can be used to engineer plants for enhanced productivity.However,the mechanism(s)by which the C2H2-type zinc fi nger transcription factor enhances pathogen resistance in cells is not fully unders... Transcription factors can be used to engineer plants for enhanced productivity.However,the mechanism(s)by which the C2H2-type zinc fi nger transcription factor enhances pathogen resistance in cells is not fully understood.Here,Agrobacterium tumefaciens carrying the gene for Arabidopsis thaliana cysteine2/histidine2-type transcription factor 6(ZAT6)was used to engineer rice(Oryza sativa L.),cotton(Gossypium hirsutum L.),and slash pine(Pinus elliottii Engelm.)to generate transgenic cell lines.Transgenic cells were then inoculated with the pathogenic bacterium Pseudomonas syringae.Compared to the control,cell viability of transgenic cells increased 39–47%and growth rate increased 9–15%by 7 days after inoculation in rice,cotton and slash pine.Acid phosphatase activity and alkaline phosphatase activity and transcript levels of Ca 2+-dependent protein kinase genes OsCPK1,OsCPK2,OsCPK6,and OsCPK8 and mitogen-activated protein kinase genes OsMAPK1,OsMAPK2,OsMAPK3,and OsMAPK8 increased signifi cantly in transgenic rice cells by 3 day after inoculation,and extracellular pH had decreased by 10–14%by 96 min after inoculation in transgenic rice,cotton and slash pine cells.These results suggest that ZAT6 enhances P.syringae resistance in plant cells by modulating transcription of CPK and MAPK and oxidase activity. 展开更多
关键词 Ca^2+-dependent protein kinase Mitogenactivated protein kinase OXIDASE PATHOGEN PINUS
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Phosphorylation of OsRbohB by the protein kinase OsDMI3 promotes H_(2)O_(2) production to potentiate ABA responses in rice 被引量:5
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作者 Qingwen Wang Tao Shen +7 位作者 Lan Ni Chao Chen Jingjing Jiang Zhenzhen Cui Shuang Wang Fengjuan Xu Runjiao Yan Mingyi Jiang 《Molecular Plant》 SCIE CSCD 2023年第5期882-902,共21页
In rice, the Ca^(2+)/calmodulin-dependent protein kinase OsDMI3 is an important positive regulator of abscisic acid (ABA) signaling. In ABA signaling, H_(2)O_(2) is required for ABA-induced activation of OsDMI3, which... In rice, the Ca^(2+)/calmodulin-dependent protein kinase OsDMI3 is an important positive regulator of abscisic acid (ABA) signaling. In ABA signaling, H_(2)O_(2) is required for ABA-induced activation of OsDMI3, which in turn increase H_(2)O_(2) production. However, how OsDMI3 regulates H_(2)O_(2) production in ABA signaling remains unknown. Here we show that OsRbohB is the main NADPH oxidase involved in ABA-induced H_(2)O_(2) production and ABA-mediated physiological responses. OsDMI3 directly interacts with and phosphorylates OsRbohB at Ser-191, which is OsDMI3-mediated site-specific phosphorylation in ABA signaling. Further analyses revealed that OsDMI3-mediated OsRbohB Ser-191 phosphorylation positively regulates the activity of NADPH oxidase and the production of H_(2)O_(2) in ABA signaling, thereby enhancing the sensitivity of seed germination and root growth to ABA and plant tolerance to water stress and oxidative stress. Moreover, we discovered that the OsDMI3-mediated OsRbohB phosphorylation and H_(2)O_(2) production is dependent on the sucrose non-fermenting 1-related protein kinases SAPK8/9/10, which phosphorylate OsRbohB at Ser-140 in ABA signaling. Taken together, these results not only reveal an important regulatory mechanism that directly activates Rboh for ABA-induced H_(2)O_(2) production but also uncover the importance of this regulatory mechanism in ABA signaling. 展开更多
关键词 abscisic acid Ca^(2+)/calmodulin-dependent protein kinase NADPH oxidases protein phosphorylation RICE
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Piezo1 suppression reduces demyelination after intracerebral hemorrhage 被引量:4
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作者 Jie Qu Hang-Fan Zong +4 位作者 Yi Shan Shan-Chun Zhang Wei-Ping Guan Yang Yang Heng-Li Zhao 《Neural Regeneration Research》 SCIE CAS CSCD 2023年第8期1750-1756,共7页
Piezo1 is a mechanically-gated calcium channel.Recent studies have shown that Piezo1,a mechanically-gated calcium channel,can attenuate both psychosineand lipopolysaccharide-induced demyelination.Because oligodendrocy... Piezo1 is a mechanically-gated calcium channel.Recent studies have shown that Piezo1,a mechanically-gated calcium channel,can attenuate both psychosineand lipopolysaccharide-induced demyelination.Because oligodendrocyte damage and demyelination occur in intracerebral hemorrhage,in this study,we investigated the role of Piezo1 in intracerebral hemorrhage.We established a mouse model of cerebral hemorrhage by injecting autologous blood into the right basal ganglia and found that Piezo1 was largely expressed soon(within 48 hours)after intracerebral hemorrhage,primarily in oligodendrocytes.Intraperitoneal injection of Dooku1 to inhibit Piezo1 resulted in marked alleviation of brain edema,myelin sheath loss,and degeneration in injured tissue,a substantial reduction in oligodendrocyte apoptosis,and a significant improvement in neurological function.In addition,we found that Dooku1-mediated Piezo1 suppression reduced intracellular endoplasmic reticulum stress and cell apoptosis through the PERK-ATF4-CHOP and inositol-requiring enzyme 1 signaling pathway.These findings suggest that Piezo1 is a potential therapeutic target for intracerebral hemorrhage,as its suppression reduces intracellular endoplasmic reticulum stress and cell apoptosis and protects the myelin sheath,thereby improving neuronal function after intracerebral hemorrhage. 展开更多
关键词 apoptosis Ca^(2+)homeostasis endoplasmic reticulum stress intracerebral hemorrhage myelin basic protein myelin degradation OLIGODENDROCYTE Piezo1 STROKE white matter injury
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GhIQD10 interacts with GhCaM7 to control cotton fiber elongation via calcium signaling 被引量:1
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作者 Fan Xu Li Wang +5 位作者 Jun Xu Qian Chen Caixia Ma Li Huang Guiming Li Ming Luo 《The Crop Journal》 SCIE CSCD 2023年第2期447-456,共10页
IQ67-domain(IQD)proteins function in plant defense and in organ development.The mechanisms by which they influence cotton fiber development are unknown.In the present study,GhIQD10 was expressed mainly in the transiti... IQ67-domain(IQD)proteins function in plant defense and in organ development.The mechanisms by which they influence cotton fiber development are unknown.In the present study,GhIQD10 was expressed mainly in the transition period of cotton fiber development,and GhIQD10-overexpression lines showed shorter fibers.GhIQD10 interacted with GhCaM7 and the interaction was inhibited by Ca^(2+).In in vitro ovule culture,Ca^(2+)rescued the shorter-fiber phenotype of GhIQD10-overexpression lines,which were insensitive to the Ca^(2+)channel inhibitor verapamil and the Ca^(2+)pool release channel blocker 2-aminoethoxydiphenyl borate.We conclude that GhIQD10 affects cotton fiber elongation via Ca^(2+)signaling by interacting with GhCaM7.Brassinosteroid(BR)biosynthesis and signaling genes were up-regulated in GhIQD10-overexpression lines.Fiber development in these lines was not affected by epibrassinolide or the BR biosynthesis inhibitor brassinozole,indicating that the influence of GhIQD10 on fiber elongation was not associated with BR. 展开更多
关键词 Cotton Fiber elongation IQ67-domian protein CA^(2+) BRASSINOSTEROID
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Role of FK506-binding protein in Ca^(2+) spark regulation 被引量:2
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作者 Yan-Ting Zhao Yun-Bo Guo +7 位作者 Xue-Xin Fan Hua-Qian Yang Peng Zhou Zheng Chen Qi Yuan Haihong Ye Guang-Ju Ji Shi-Qiang Wang 《Science Bulletin》 SCIE EI CAS CSCD 2017年第19期1295-1303,共9页
The elementary Ca^2+ release events, Ca2+ sparks, has been found for a quarter of century. However, the molecular regulation of the spark generator, the ryanodine receptor (RyR) on the sarcoplasmic reticulum, rema... The elementary Ca^2+ release events, Ca2+ sparks, has been found for a quarter of century. However, the molecular regulation of the spark generator, the ryanodine receptor (RyR) on the sarcoplasmic reticulum, remains obscure. Although each subunit of the RyR homotetramer has a site for FKS06-binding protein (FKBP), the role of FKBPs in modifying RyR Ca^2+ sparks has been debated for long. One of the reasons behind the controversy is that most previous studies detect spontaneous sparks, where the mixture with out-of-focus events and local wavelets prevents an accurate characterization of Ca^2+ sparks. In the pre- sent study, we detected Ca^2+ sparks triggered by single L-type Ca^2+ channels (LCCs) under loose-seal patch clamp conditions in FKS06-treated or FKBPI2.6 knockout cardiomyocytes. We found that FKBP dissociation both by FKS06 and by rapamycin decreased the Ca^2+ spark amplitude in ventricular cardiomyocytes. This change was neither due to decreased releasable Ca^2+ in the sarcoplasmic reticulum, nor explained by changed RyR sensitivity. Actually FKS06 increased the LCC-RyR coupling probability and curtailed the latency for an LCC to trigger a RyR Ca^2+ spark. FKBP12.6 knockout had similar effects as FKS06/rapamycin treatment, indicating that the decreased spark amplitude was attributable to the dissociation of FKBP12.6 rather than FKBP12. We also explained how decreased amplitude of spontaneous sparks after FKBP dissociation sometimes appears to be increased or unchanged due to inappropriate data processing. Our results provided firm evidence that without the inter-RyR coordination by functional FKBP12.6, the RyR recruitment during a Ca^2+ spark would be compromised despite the sensitization of individual RyRs. 展开更多
关键词 Ca^2 sparkFKSO6-binding protein Ryanodine receptorlntracellular calcium Excitation-contraction coupling
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Cloning and Characterization of a Homologous Ca^(2+)/Calmodulin-Dependent Protein Kinase PSKH1 from Pearl Oyster Pinctada fucata
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作者 戴益平 谢莉萍 +3 位作者 熊训浩 陈蕾 范为民 张荣庆 《Tsinghua Science and Technology》 SCIE EI CAS 2005年第4期504-511,共8页
Many of the effects of Ca^2+ signaling are mediated through the Ca^2+/calmodulin complex and its acceptors, the Ca^2+/calmodulin-dependent protein kinases, including PSKHI. Studies of the proteins involved in the c... Many of the effects of Ca^2+ signaling are mediated through the Ca^2+/calmodulin complex and its acceptors, the Ca^2+/calmodulin-dependent protein kinases, including PSKHI. Studies of the proteins involved in the calcium metabolism in oysters will help elucidate the pearl formation mechanism. This paper describes a full-length PSKH1 cDNA isolated from pearl oyster Pinctada fucata. Oyster PSKH1 shares 65% homology with human PSKH1 and 48% similarity with rat CaM kinase I in the amino acid sequence, and contains a calmodulin-binding domain. The results of semi-quantitative reverse transcription-polymerase chain reaction and in situ hybridization revealed that oyster PSKH1 mRNA is highly expressed in the outer epithelial cells of the mantle pallial and in the gill epithelial cells. These studies provide important information describing the complex Ca^2+ signaling mechanism in oyster calcium metabolism. 展开更多
关键词 PSKH1 calcium metabolism BIOMINERALIZATION pearl oyster Pinctada fucata Ca^2+/calmodulin-dependent protein kinases (CaMKs)
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阿尔茨海默病中β淀粉样蛋白的神经毒性机制 被引量:12
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作者 杨吉平 方欣 赖红 《解剖科学进展》 CAS 2007年第3期264-266,共3页
β淀粉样蛋白(β-amyloid protein,Aβ)是阿尔茨海默病(Alzheimer's disease,AD)发病过程中的核心因子,它通过影响G蛋白偶联的信号转导通路使氧自由基代谢紊乱,神经元的膜性结构受损。目前研究认为Aβ自身即可聚合成Ca2+通道,使细胞... β淀粉样蛋白(β-amyloid protein,Aβ)是阿尔茨海默病(Alzheimer's disease,AD)发病过程中的核心因子,它通过影响G蛋白偶联的信号转导通路使氧自由基代谢紊乱,神经元的膜性结构受损。目前研究认为Aβ自身即可聚合成Ca2+通道,使细胞内Ca2+超载,从而引发一系列神经毒性反应。Aβ还可激活胶质细胞使之释放IL-1、IL-6和S100β等,造成中枢免疫炎性反应,最终诱发了神经元凋亡,参与AD发病机制。 展开更多
关键词 Β淀粉样蛋白 阿尔茨海默病 神经毒性机制 protein 自由基代谢紊乱 CA^2+通道 CA^2+超载 神经元凋亡
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慢性心房颤动患者心房肌钙转运调控蛋白基因转录表达的改变 被引量:3
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作者 汤宝鹏 许国军 +3 位作者 伊力哈木江.沙比提 库热西.玉努斯 木拉提.阿布提热合曼 程祖亨 《中国医学科学院学报》 CAS CSCD 北大核心 2007年第5期642-646,共5页
目的探讨心房颤动(AF)时心房肌细胞钙超载的原因及其在AF发生和维持中的作用。方法采集风湿性心脏瓣膜病窦性心律患者12例(对照组)和AF患者14例(AF组)的右心耳组织,采用RT-PCR方法检测心房肌钙转运调控蛋白mRNA表达水平,测量AF患者左右... 目的探讨心房颤动(AF)时心房肌细胞钙超载的原因及其在AF发生和维持中的作用。方法采集风湿性心脏瓣膜病窦性心律患者12例(对照组)和AF患者14例(AF组)的右心耳组织,采用RT-PCR方法检测心房肌钙转运调控蛋白mRNA表达水平,测量AF患者左右心房内径、二尖瓣口面积和肺动脉收缩压。结果与对照组相比,AF组患者L-型电压依赖钙通道a1c亚基(LVDCCa1c)、肌浆网Ca2+-ATP酶和兰尼碱受体(RYR2)的mRNA表达水平显著下调(P均<0.01),三磷酸肌醇受体(IP3R1)的mRNA表达水平上调(P<0.05),而磷酸受纳蛋白和肌集钙蛋白的mRNA表达水平无明显改变(P均>0.05)。AF组患者肌浆网Ca2+-ATP酶的mRNA表达水平与左心房内径呈负相关(r=-0.573,P=0.032),与二尖瓣口面积呈正相关(r=0.625,P=0.017);LVDCCa1c的mRNA表达水平与二尖瓣口面积呈正相关(r=0.719,P=0.004)。结论细胞内钙超载机制可能参与了AF的发生和维持,心房肌钙转运调控蛋白mRNA表达异常可能是钙超载的分子生物学机制,钙转运调控蛋白mRNA表达异常与左心房解剖学改变之间存在内在联系。 展开更多
关键词 心房颤动 钙转运调控蛋白 基因表达
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心房颤动电重构心房肌Ca^(2+)调控蛋白异常与解剖学改变关系的研究 被引量:5
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作者 张薇 张学义 +3 位作者 钟明 张供 卞继峰 张运 《中华心律失常学杂志》 2002年第2期93-96,共4页
目的 探讨心房肌Ca2 + 调控蛋白 (calciumhandlingproteins)在心房颤动 (atrialfibrillation ,AF)电重构中的作用及与解剖学结构改变的关系。方法 测定 10例慢性AF患者和 6例对照组心房肌Ca2 + 含量和细胞膜L型Ca2 + 通道 (L typecalc... 目的 探讨心房肌Ca2 + 调控蛋白 (calciumhandlingproteins)在心房颤动 (atrialfibrillation ,AF)电重构中的作用及与解剖学结构改变的关系。方法 测定 10例慢性AF患者和 6例对照组心房肌Ca2 + 含量和细胞膜L型Ca2 + 通道 (L typecalciumchannel)、肌浆网钙泵 (sarcoplasmicreticulumcalciumadenodinetriphosphatase ,SRCa2 + ATPase)、磷酸受纳蛋白 (phospholamban)、兰尼碱受体 (ryanodinere ceptor)和肌集钙蛋白 (calsequestrin)的信使核糖核酸 (messengerribonucleicacid ,mRNA)表达 ;测量AF患者左、右心房内径、二尖瓣口面积和肺动脉收缩压。结果 与对照组比较 ,AF患者心肌细胞内Ca2 +含量增加 [(1330± 770 ) μg/mlvs(30 2± 31) μg/ml,P <0 0 1];细胞膜L型Ca2 + 通道、SRCa2 + ATPase和兰尼碱受体mRNA下调 [(0 6 5± 0 30 )vs(0 97± 0 19) ,P <0 0 1;(0 73± 0 13)vs(1 10± 0 11) ,P<0 0 0 1;(0 71± 0 2 5 )vs(0 90± 0 13) ,P <0 0 5 ]。SRCa2 + ATPasemRNA表达与左心房内径中度负相关 (r=- 0 .5 6 ,P <0 .0 5 ) ;与二尖瓣口面积正相关 (r =0 .70 ,P <0 .0 5 ) ;细胞膜L型Ca2 + 通道mR NA表达与二尖瓣口面积显著正相关 (r =0 .84,P <0 .0 1)。 展开更多
关键词 心房颤动 Ca^2+调控蛋白 结构改变
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肌浆网钙调节蛋白在心肌肥厚病理中的作用 被引量:3
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作者 祝宝华 张寄南 马文珠 《东南大学学报(医学版)》 CAS 2002年第1期49-51,共3页
目的 :探讨心肌肌浆网钙调节蛋白功能变化在高血压左心室肥厚病理中的作用。方法 :用自发性高血压大鼠 (SHR)制成左心室肥厚模型 ,以 [3 H]ryanodine为放射配基、p 硝基苯酰磷酸 (PNPP)为底物分别测定左心室肌浆网ryanodine受体密度及钙... 目的 :探讨心肌肌浆网钙调节蛋白功能变化在高血压左心室肥厚病理中的作用。方法 :用自发性高血压大鼠 (SHR)制成左心室肥厚模型 ,以 [3 H]ryanodine为放射配基、p 硝基苯酰磷酸 (PNPP)为底物分别测定左心室肌浆网ryanodine受体密度及钙ATP酶活力的改变。结果 :(1)SHR左心室肥厚时 ,ryanodine受体Bmax值比对照组 (WKY组 )升高 (P <0 .0 1) ,亲和常数 (Kd)无变化 ;钙ATP酶活力下降 (P <0 .0 1)。 (2 )与SHR组相比 ,SHR培哚普利治疗组ryanodine受体Bmax下降 (P <0 .0 5 ) ,钙ATP酶活力上升 (P <0 .0 5 )。结论 展开更多
关键词 钙调节蛋白 高血压 左心室肥厚 肌浆网
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心肌兴奋-收缩偶联在心力衰竭中的研究进展 被引量:2
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作者 李青 李菊香 《基础医学与临床》 CSCD 北大核心 2014年第8期1129-1132,共4页
心肌兴奋-收缩偶联(ECC)是心脏电活动转换成机械收缩的过程,Ca2+释放通道(RyR2)在ECC中起核心作用。Ca2+和Na+转运参与ECC的全过程。Ca2+转运蛋白和细胞内激酶与心力衰竭的发生发展密切相关,Ca2+转运的改变常发生在心功能衰竭之前。Ca2... 心肌兴奋-收缩偶联(ECC)是心脏电活动转换成机械收缩的过程,Ca2+释放通道(RyR2)在ECC中起核心作用。Ca2+和Na+转运参与ECC的全过程。Ca2+转运蛋白和细胞内激酶与心力衰竭的发生发展密切相关,Ca2+转运的改变常发生在心功能衰竭之前。Ca2+转运与Na+转运相互影响,细胞内Na+转运因细胞内Na+浓度和晚钠电流增加而受到干扰,舒张期Ca2+持续增加导致舒张功能障碍,并诱导心律失常。 展开更多
关键词 兴奋-收缩偶联 钙调蛋白依赖性蛋白激酶 钙转运 钠转运
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儿童手术应激升高血清髓样相关蛋白8/14的表达 被引量:1
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作者 严伟玲 郭剑毅 张奇 《基础医学与临床》 CSCD 2018年第10期1446-1447,共2页
髓样相关蛋白8(myeloid-related protein,MRP 8,又称S100A8或calgranulin A)和髓样相关蛋白14(MRP 14,又称S100A9或calgranulin B)是两种Ca^2+结合蛋白,属于Ca^2+结合蛋白S100家族,并且MRP8和MRP14通常以MRP8/14复合物的形式存在... 髓样相关蛋白8(myeloid-related protein,MRP 8,又称S100A8或calgranulin A)和髓样相关蛋白14(MRP 14,又称S100A9或calgranulin B)是两种Ca^2+结合蛋白,属于Ca^2+结合蛋白S100家族,并且MRP8和MRP14通常以MRP8/14复合物的形式存在[1]。其主要在单核细胞和巨噬细胞等髓系来源的细胞中表达,比如中性粒细胞和单核细胞. 展开更多
关键词 相关蛋白 髓样 手术应激 Ca^2+结合蛋白 S100A8 protein MRP14 血清
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