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Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models
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Inner membrane dynamics in mitochondria

Daniel Dikov1, Juergen Bereiter-Hahn2

  • 1Kinematic Cell Research Group, Institute for Cell Biology and Neurosciences, Goethe University Frankfurt, Max-von-Laue Strasse 13, 60438 Frankfurt am Main, Germany; Mitochondrial Biology Group, Buchmann Institute for Molecular Life Sciences, Goethe University Frankfurt, Max-von-Laue Strasse 15, 60438 Frankfurt am Main, Germany.

Journal of Structural Biology
|June 25, 2013
PubMed

Insights

Mitochondrial cristae dynamics were visualized using non-saturation fluorescence microscopy (NSFM). Cristae positions are stable but dynamically change near cell division sites, with movements reduced by oligomycin.

Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Microscopy Techniques

Background:

  • Mitochondria possess a complex internal structure with cristae crucial for ATP production.
  • Understanding cristae dynamics is vital for comprehending mitochondrial function and cellular health.

Purpose of the Study:

  • To visualize and analyze the dynamic behavior of mitochondrial cristae in living cells.
  • To investigate the spatial and temporal distribution of mitochondrial components.

Main Methods:

  • Utilized non-saturation fluorescence microscopy (NSFM) with IMP-EGFP labeled cells.
  • Employed sub-saturating fluorescence excitation and deconvolution techniques for enhanced resolution.
  • Combined spatial and temporal fluorescence intensity analysis of mitochondria.

Main Results:

  • Revealed inhomogeneous spatial and temporal fluorescence distribution along mitochondria, reflecting cristae and matrix organization.
  • Observed dynamic cristae movements ('wobbling') with temporal fluctuations of 0.3-3s.
  • Demonstrated that cristae positions are generally stable but disassemble near fission sites, with oligomycin reducing wobbling.

Conclusions:

  • Mitochondrial cristae exhibit dynamic behavior, including stable positioning with localized disassembly during fission.
  • NSFM provides high temporal resolution for studying mitochondrial substructure dynamics.
  • Oligomycin treatment impacts cristae dynamics, suggesting a link to mitochondrial energy metabolism.
Keywords:
Cristae dynamicsCristae – matrix visualizationFPALMGFPIMMIMPMitochondriaNSFMNon-saturation fluorescence microscopy (NSFM)OMMROSSOFISTEDTMREfluorescence photoactivation localization microscopygreen fluorescent proteininner mitochondrial membraneinner mitochondrial membrane proteinmitochondrial membrane potentialnon-saturation fluorescence microscopyouter mitochondrial membranepixelpxreactive oxygen speciesstimulated emission depletion – microscopysuper-resolution optical fluctuation imagingtetramethylrhodamine ethylesterΔψ

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