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Cellular Allometry of Mitochondrial Functionality Establishes the Optimal Cell Size.

Teemu P Miettinen1, Mikael Björklund2

  • 1Division of Cell and Developmental Biology, School of Life Sciences, University of Dundee, Dundee DD1 5EH, UK; MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK; Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

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Summary

Eukaryotic cells maintain optimal size through mitochondrial function, not just content. Mitochondrial activity peaks at intermediate cell sizes, maximizing cellular fitness and proliferation.

Keywords:
Drp1allometrycell sizefitnessgrowthmetabolismmevalonate pathwaymitochondriamitochondrial dynamicsorganelle scaling

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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Cell Size Regulation

Background:

  • Eukaryotic cells exhibit size homeostasis, aiming for an optimal size.
  • Metabolic efficiency is expected to decrease with increasing cell size according to allometric principles.
  • Understanding the relationship between cell size and mitochondrial function is crucial for cell biology.

Purpose of the Study:

  • To investigate how mitochondrial content and function scale with eukaryotic cell size.
  • To determine if mitochondrial scaling follows isometric or allometric laws.
  • To elucidate the role of mitochondrial dynamics in establishing and maintaining optimal cell size.

Main Methods:

  • Utilized elutriation to separate cells based on size.
  • Employed single-cell flow cytometry to analyze mitochondrial membrane potential and oxidative phosphorylation.
  • Investigated the cell cycle and cell size dependency of mitochondrial functionality.

Main Results:

  • Mitochondrial content scales linearly with cell size.
  • Mitochondrial membrane potential and oxidative phosphorylation exhibit a nonlinear relationship, peaking at intermediate cell sizes.
  • Mitochondrial functionality is dependent on cell size, not cell cycle stage.

Conclusions:

  • Mitochondrial content and functional scaling are uncoupled, challenging simple isometric scaling.
  • Nonlinear mitochondrial functionality at intermediate cell sizes optimizes cellular fitness and proliferative capacity.
  • Mitochondrial dynamics, potentially regulated by the mevalonate pathway, are essential for maintaining optimal cell size.