Mitochondrial dynamics and quantification of mitochondria-derived vesicles in cardiomyoblasts using structured...

Area of Science:

• Cell Biology
• Mitochondrial Biology
• Microscopy

Background:

• Mitochondria are vital organelles for cellular energy production, especially in high-energy-demand tissues like the heart.
• Mitochondria-derived vesicles (MDVs) are crucial for maintaining a healthy mitochondrial pool but are challenging to image due to their small size and rapid movement.
• Existing imaging techniques often struggle to capture the dynamics and abundance of MDVs.

Purpose of the Study:

• To evaluate the efficacy of 3D structured illumination microscopy (3DSIM) for high-resolution imaging of MDVs.
• To optimize 3DSIM imaging conditions for both live-cell video microscopy and fixed-cell analysis of MDVs.
• To investigate the abundance of MDVs under normal and metabolically perturbed conditions.

Main Methods:

• Utilized 3D structured illumination microscopy (3DSIM) for optical super-resolution imaging.
• Optimized imaging parameters for high-speed video microscopy and fixed-cell analysis.
• Quantified MDV density in H9c2 cells under normal growth and glucose deprivation conditions.

Main Results:

• 3DSIM successfully captured high-resolution images of MDVs and dynamic mitochondrial tubules.
• Observed a significantly higher abundance of MDVs in H9c2 cells subjected to glucose deprivation compared to normal conditions.
• Demonstrated the potential of 3DSIM for detailed research into MDV dynamics and function.

Conclusions:

• 3DSIM is a powerful tool for visualizing and studying mitochondria-derived vesicles.
• Metabolic stress, specifically glucose deprivation, increases the abundance of MDVs in H9c2 cells.
• Further application of 3DSIM can significantly advance our understanding of mitochondrial quality control mechanisms.