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Many cellular signals are hydrophilic and cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind intracellular receptors that reside within the cell cytoplasm or nucleus. Many mammalian steroid hormones and nitric oxide (NO) gas use this cell signaling mechanism.
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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
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Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.
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The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
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Intrinsic activity in cells and the brain.

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Cells constantly use energy for internal processes, similar to the brain

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Area of Science:

  • Cell biology
  • Neuroscience
  • Systems biology

Background:

  • Motile cells exhibit continuous energy-consuming reactions involving the cytoskeleton and signaling pathways, irrespective of active migration.
  • This intrinsic cellular activity parallels the brain's continuous, non-migratory neural activity.

Purpose of the Study:

  • To explore the concept of "silent signals" in motile cells.
  • To draw parallels between cellular intrinsic activity and the brain stem's intrinsic activity.
  • To propose that organisms rehearse potential actions internally.

Main Methods:

  • Comparative analysis of cellular energy consumption and neural activity.
  • Conceptual framework linking cellular "silent signals" to neural "rehearsal".

Main Results:

  • Motile cells maintain baseline energy expenditure for cytoskeletal and signaling functions.
  • The human brain, particularly the brain stem, exhibits continuous intrinsic activity.
  • A conceptual parallel is drawn between cellular "silent signals" and brain stem activity.

Conclusions:

  • Cellular "silent signals" represent a form of internal "rehearsal" for potential environmental interactions.
  • This internal "rehearsal" allows for rapid and accurate responses to environmental cues.
  • The findings suggest a fundamental principle of anticipatory action across biological scales.