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相关概念视频

Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

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The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
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Some signaling systems generate...
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Signal Transduction: Overview01:26

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Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
Typically, signal transduction involves three...
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Overview of Cell Signaling01:23

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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
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Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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相关实验视频

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Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
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细胞信号系统中的短暂频率偏好响应.

Candela L Szischik1,2, Juliana Reves Szemere1,2,3, Rocío Balderrama4,5

  • 1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física. Ciudad Universitaria, 1428, Buenos Aires, Argentina.

NPJ systems biology and applications
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PubMed
概括

细胞信号系统在对重复刺激的早期反应中表现出独特的短暂频率偏好,这种机制可能用于过信号. 这种短暂的反应不同于稳定状态的行为,对于理解细胞信息处理至关重要.

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科学领域:

  • 系统生物学 系统生物学
  • 蜂信号传输是如何进行的
  • 基因表达 基因表达 基因表达

背景情况:

  • 细胞信号组件,如联体受体系统,共价修饰循环和转录网络是基因表达的关键.
  • 虽然对刺激的稳定状态反应已被理解,但对重复信号的早期和短暂反应的特征仍然不佳.
  • 早期的细胞反应可能与晚期的细胞反应一样有信息,特别是当刺激是暂时的或组件时间尺度不同时.

研究的目的:

  • 分析不同时间阶段的简单生物动机的频率响应,重点关注短暂与周期性模式.
  • 为了研究孤立动机中的短暂频率偏好如何反映在更大的细胞级联和途径中.
  • 突出暂时频率偏好作为蜂电路中信号过机制的潜在作用.

主要方法:

  • 在简单的生物动机中分析频率响应,使用剂量保留的脉动输入信号.
  • 检查各种指标与频率曲线在不同的时间阶段的刺激.
  • 在孤立的动图中评估短暂的频率偏好及其对更大的信号级联的影响.

主要成果:

  • 灵受体系统在过渡阶段表现出频率偏好反应,而这些反应在周期性系统中是不存在的.
  • 在刺激的早期,短暂阶段,在特定指标中观察到明显的频率偏好.
  • 这种短暂的频率偏好机制被发现可以将其推广到更复杂的信号级联和通路.

结论:

  • 短暂的频率偏好是细胞信号和基因表达的一个被忽视但重要的动态特征.
  • 电池可以利用短暂的频率偏好作为系统级的机制来过传入信号的更高阶电路.
  • 了解这些早期的动态对于全面了解细胞信息处理至关重要.