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Mitochondrial structure revealed by high-resolution scanning electron microscopy.

P J Lea¹, M J Hollenberg

¹Department of Anatomy, Faculty of Medicine, University of Toronto, Ontario, Canada.

The American Journal of Anatomy

|March 1, 1989

Summary

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This study reveals that mitochondrial cristae are tubular, spanning the organelle and connecting to the inner mitochondrial membrane. This challenges the traditional view of shelf-like cristae in cellular respiration.

Area of Science:

Cell Biology
Mitochondrial Biology
Electron Microscopy

Background:

Mitochondria are vital organelles responsible for cellular respiration.
The internal structure of mitochondria, particularly the cristae, is crucial for their function.
Previous models often depicted mitochondrial cristae as shelf-like.

Purpose of the Study:

To investigate the three-dimensional structure of mitochondrial cristae using high-resolution scanning electron microscopy.
To determine the morphology of cristae across various mammalian cell types.
To propose a revised model for mitochondrial cristae structure.

Main Methods:

High-resolution scanning electron microscopy (Hitachi S-570).
Aldehyde-osmium fixation and freeze cleavage of rat liver, retina, and kidney tissues.

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Cytosol removal using a dilute osmium tetroxide solution.

Main Results:

Mitochondria in all examined tissues exhibited exclusively tubular cristae.
These tubular cristae spanned the mitochondrial matrix and opened into the intermembranous space.
Unfractured tubular cristae walls were observed in contact with the inner mitochondrial membrane.

Conclusions:

Mitochondrial cristae are predominantly tubular, not shelf-like, in the studied cell types.
Tubular cristae are continuous with the inner mitochondrial membrane at both ends.
This finding suggests a revised understanding of mitochondrial architecture and function.