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Related Concept Videos

Cell Signaling Feedback Loops01:07

Cell Signaling Feedback Loops

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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.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
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Effects of feedback01:24

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Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
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Positive and Negative Feedback Loops01:18

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Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
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Feedback control systems01:26

Feedback control systems

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
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Diversity in Cell Signaling Responses01:22

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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. 
Graded and Abrupt Responses
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Gain01:15

Gain

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Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
Gain:
Suppose Vin is the input and Vout is the output signal to a circuit.
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Related Experiment Video

Updated: Mar 29, 2026

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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Signaling output: it's all about timing and feedbacks.

Nils Blüthgen1

  • 1Charite Universitätsmedizin Berlin, Berlin, Germany.

Molecular Systems Biology
|November 29, 2015
PubMed
Summary

Signaling pathways use feedback and feed-forward regulation to determine cell fate. Different timescales of these regulations enable distinct cellular responses to single-ligand stimulation.

Area of Science:

  • Cellular signaling
  • Systems biology
  • Molecular biology

Background:

  • Understanding how cells interpret external stimuli to make fate decisions is crucial.
  • Signaling pathway specificity relies on encoding and decoding stimulus information.

Discussion:

  • Ryu et al. (2015) investigated how differential engagement of feedback and feed-forward regulation impacts signaling pathway dynamics.
  • Ligand stimulation experiments revealed distinct pathway activity dynamics correlating with cell fate outcomes.

Key Insights:

  • Differential regulation dynamics dictate cell fate decisions.
  • Timescale of feedback loops is critical for cellular responses.
  • Pulsed stimulation with a single ligand can trigger varied cellular responses by manipulating feedback timescales.

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Outlook:

  • Further exploration of regulatory network dynamics can uncover novel therapeutic targets.
  • This framework can be applied to other biological signaling systems.
  • Investigating the precise molecular mechanisms underlying timescale-dependent regulation is warranted.