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Primary Active Transport01:47

Primary Active Transport

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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...
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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
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相关实验视频

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代谢抑制和线粒体K ((ATP) 通道的开放都具有肌肉保护作用,并启动一个补偿性的 sarcolemmal 外膜电流.

Hiroshi Irie1, Junyuan Gao, Glenn R Gaudette

  • 1Division of Cardiothoracic Surgery, Department of Physiology & Biophysics, Institute for Molecular Cardiology, State University of New York at Stony Brook, 11794-8191, USA.

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|September 13, 2003
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概括
此摘要是机器生成的。

代谢抑制和mitoK(ATP) 通道开放剂可以保护心脏免受缺血. 这种心脏保护涉及对ATP敏感的线粒体 (mitoK(ATP)) 通道,并影响表面膜电流.

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科学领域:

  • 心血管生理学心血管生理学
  • 线粒体生物学 线粒体生物学
  • 细胞电生理学 细胞电生理学

背景情况:

  • 氧化酸化阻塞可能会激活对ATP敏感的线粒体 (mitoK(ATP)) 通道.
  • 调查代谢抑制和mitoK(ATP) 通道开启剂是否能提供对心脏组织缺血的保护.

研究的目的:

  • 为了确定代谢抑制和mitoK(ATP) 通道开放剂是否能保护整个心脏和孤立的心脏细胞免受缺血性损伤.
  • 阐明 mitoK ((ATP) 通道在心肌预调中的作用.

主要方法:

  • 隔离的子心经经历了缺血预调 (IPC) 或预调用化 (NaCN) 或氧化,有或没有MitoK(ATP) 抑制剂5-基酸 (5-HD).
  • 在通过冠状动脉封闭诱导缺血后,测量了心脏病的大小.
  • 隔离的几内亚猪腹腔肌细胞被NaCN或氧化物预条件,并记录了它们对压缩电位和NaCN暴露的反应.

主要成果:

  • 与对照组相比,NaCN,氧化或IPC的预条件显著降低了与对照组相比,隔离的子心脏中的心脏病发作大小.
  • NaCN,氧化物和IPC的保护作用被5-HD.逆转了.
  • 用NaCN或氧化物预制显著减少了在孤立的肌细胞中诱导向外流的时间.

结论:

  • 前置条件通过激活mitoK ((ATP)) 通道来保护心肌.
  • 这种保护机制也会影响表面膜电流,可能有助于在缺血期间保护心肌.