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Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

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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Integrative Toolkit to Analyze Cellular Signals: Forces, Motion, Morphology, and Fluorescence
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Structural-diversity-enhanced cellular ability to detect subthreshold extracellular signals.

Hanshuang Chen1, Jiqian Zhang, Jianqing Liu

  • 1College of Physics and Electronic Information, Anhui Normal University, Wuhu, Anhui 241000, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 16, 2007
PubMed
Summary

Cellular structural diversity improves the detection of weak signals via calcium (Ca2+) oscillations. This structural diversity-induced coherence resonance optimizes Ca2+ spike regularity, highlighting its constructive role in biological systems.

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Area of Science:

  • Cellular dynamics
  • Biophysics
  • Systems biology

Background:

  • Coupled hepatocytes exhibit complex intracellular Ca2+ dynamics.
  • Subthreshold agonist signals are crucial for cellular communication.
  • Cellular structural diversity can impact system behavior.

Purpose of the Study:

  • To investigate the influence of cellular structural diversity on subthreshold agonist signals in coupled hepatocytes.
  • To characterize the role of structural diversity in signal detection and Ca2+ dynamics.
  • To explore the effects of stimulus level and coupling strength on these phenomena.

Main Methods:

  • Modeling coupled hepatocytes systems.
  • Characterizing structural diversity using the variance of a cellular structural parameter (sigma).
  • Analyzing intracellular Ca2+ oscillations and Ca2+ spike regularity.

Main Results:

  • Structural diversity enhances the detection of weak extracellular signals through intracellular Ca2+ oscillations.
  • Ca2+ spike regularity exhibits a maximum with variation in sigma, indicating structural-diversity-induced coherence resonance.
  • Subthreshold stimulus level and junctional coupling strength modulate Ca2+ dynamics.

Conclusions:

  • Structural diversity plays a constructive role in biological systems by enhancing signal detection.
  • Coherence resonance induced by structural diversity optimizes cellular response to weak signals.
  • The observed phenomena are linked to single-cell bifurcation features and intercellular coupling.