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Optimality of intercellular signaling: Direct transport versus diffusion.

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Direct cell communication via protrusions is more energy-efficient than diffusion for large signal amounts. Optimal projection rates balance contact costs and molecule synthesis, favoring direct transport in long-range signaling.

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Area of Science:

  • Cellular Biology
  • Biophysics
  • Systems Biology

Background:

  • Intercellular signaling is crucial for organism development.
  • Communication between cells occurs via diverse mechanisms, including diffusion and direct transport.
  • Understanding the energy efficiency of these mechanisms is key to deciphering cellular communication strategies.

Purpose of the Study:

  • To analyze and compare the energy efficiency of diffusion versus direct transport via cellular protrusions.
  • To determine factors influencing the optimal strategy for intercellular communication.
  • To elucidate the conditions favoring protrusion-mediated signaling.

Main Methods:

  • Computational modeling of intercellular signaling pathways.
  • Analysis of energy costs associated with molecule diffusion and direct transport.
  • Parametric studies to evaluate signaling efficiency under varying conditions.

Main Results:

  • Optimal projection rates for direct transport depend on target cell location information and transport costs.
  • Direct transport is more energy-efficient than diffusion when a large quantity of signaling molecules is involved.
  • A critical number of signaling molecules exists where both mechanisms show equal efficiency.

Conclusions:

  • Direct transport via cellular protrusions is favored for high-volume intercellular communication.
  • The efficiency of protrusion-based signaling is enhanced by optimal projection rates and favorable transport dynamics.
  • Protrusion-mediated mechanisms are advantageous for long-range cellular communication, especially when cell distances are large.