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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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A Doxorubicin-Induced Murine Model of Dilated Cardiomyopathy In Vivo
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德克索鲁比辛通过抑制溶酶体酸化阻断心肌细胞自流

Dan L Li1, Zhao V Wang1, Guanqiao Ding1

  • 1From Division of Cardiology (D.L.L., Z.V.W., G.D., X.L., A.C., M.X., N.J., H.M., V.K., J.W.S., T.G.G., J.A.H.) and Department of Molecular Biology (W.T., J.A.H.), UT Southwestern Medical Center, Dallas, TX.

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概括
此摘要是机器生成的。

doxorubicin 通过阻断 lysosome 功能来阻碍心脏细胞的自. 减少自启动可以防止多克索鲁比辛的心脏毒性,为心脏损伤提供潜在的治疗策略.

关键词:
自食症心脏毒性多克索鲁比辛药物治疗肌细胞,心脏

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科学领域:

  • 心血管研究
  • 细胞生物学
  • 药理学

背景情况:

  • doxorubicin 化疗受到心脏毒性的限制,其特征是心肌纤维化和真空心肌细胞.
  • 自在多克索鲁比引起的心脏损伤中的作用尚不清楚.
  • 由于严重的系统性影响,现有的心脏毒性模型混了自的解释.

研究的目的:

  • 调查自在多克索鲁比辛心脏毒性的作用.
  • 为更清晰的自分析建立多克索鲁比辛心脏毒性模型.
  • 确定多克索鲁比对心肌细胞自的特定机制.

主要方法:

  • 开发了一种新型的温和,渐进的心脏毒性模型,
  • 在体内和培养中使用 doxorubicin 评估了心肌细胞的自流.
  • 检查了 lysosomal 酸化和功能.
  • 使用Beclin 1的缺陷和过度表达的小鼠来研究自的功能相关性.

主要成果:

  • 发现 doxorubicin 阻断了心肌细胞的自流,导致了自解酶体的积累.
  • 这种阻断归因于 lysosome 酸化的受损.
  • 减少自的小鼠 (Beclin 1+/ -) 受到多克索鲁比辛心脏毒性的保护.
  • 过度表达Beclin 1的小鼠表现出心脏毒性恶化.

结论:

  • doxorubicin 通过抑制 lysosome 酸化和功能而影响心肌细胞自.
  • 降低自启动可以防止多克索鲁比引起的心脏毒性.
  • 向自调节可能是减轻多克索鲁对心脏有害影响的策略.