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Related Experiment Video

Updated: Jul 27, 2025

Thermal Ablation for the Treatment of Abdominal Tumors

Thermal Ablation for the Treatment of Abdominal Tumors

Published on: March 7, 2011

Ablation of

Bryanna Shao¹, Mason Killion¹, Ashton Oliver¹

¹Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, 37232, USA.

Biorxiv : the Preprint Server for Biology

|June 9, 2023

Summary

This summary is machine-generated.

Mitochondrial protein Sam50 is crucial for skeletal muscle integrity and metabolism. Its deficiency causes mitochondrial fragmentation and impaired oxidative capacity, impacting cellular energy production.

Keywords:

3D reconstruction MICOS SAM complex Sam50 mitochondria

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Last Updated: Jul 27, 2025

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Area of Science:

Mitochondrial biology
Cellular metabolism
Skeletal muscle physiology

Background:

The Sorting and Assembly Machinery (SAM) complex, particularly the Sam50 subunit, is essential for β-barrel protein assembly in mitochondrial membranes.
Sam50 stabilizes the mitochondrial intermembrane space bridging (MIB) complex, vital for protein transport and mitochondrial structure.
The precise role of Sam50 in skeletal muscle mitochondrial structure and metabolism is not well understood.

Approach:

Utilized serial block-face-scanning electron microscopy (SBF-SEM) and 3D rendering to analyze mitochondrial morphology in Sam50-deficient and wild-type (WT) myotubes.
Assessed autophagosome structure in human myotubes.
Employed Gas Chromatography-Mass Spectrometry (GC-MS) based metabolomics to profile metabolic changes.
Measured oxidative capacity using the XF24 Seahorse Analyzer.

Key Points:

Sam50 deficiency led to increased mitochondrial fragmentation and autophagosome formation in myotubes.
Metabolomic analysis revealed altered metabolism of propanoate, amino acids (ß-Alanine, phenylalanine, tyrosine), and fatty acids.
Ablation of Sam50 impaired mitochondrial oxidative capacity in both murine and human myotubes.

Conclusions:

Sam50 plays a critical role in maintaining mitochondrial integrity, cristae structure, and metabolic function in skeletal muscle.
Understanding Sam50's function provides insights into mitochondrial disorders and skeletal muscle health.
This study highlights Sam50 as a key regulator of mitochondrial homeostasis and energy metabolism.