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Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry

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Mitochondrial complex enzyme activities and cytochrome C expression changes in multiple sclerosis.

Pedro Iñarrea¹, Raquel Alarcia, María A Alava

¹Department of Biochemistry, Molecular and Cellular Biology, Science Faculty, University of Zaragoza, 50009, Zaragoza, Spain, inarrea@unizar.es.

Molecular Neurobiology

|June 14, 2013

Summary

This summary is machine-generated.

Platelets reveal altered mitochondrial function in multiple sclerosis (MS). Key enzymes and proteins show significant changes, indicating MS impacts cellular energy metabolism and oxidative stress markers in blood platelets.

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Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples

Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples

Published on: May 3, 2024

Area of Science:

Biochemistry
Neuroscience
Cell Biology

Background:

Blood platelets are recognized biomarkers for mitochondrial dysfunction in aging, neurodegenerative diseases, and Parkinson's and Alzheimer's diseases.
Mitochondrial defects are implicated in neurological conditions, prompting investigation into their role in multiple sclerosis (MS).

Purpose of the Study:

To investigate mitochondrial aerobic metabolism and protein expression in platelets of MS patients compared to controls.
To assess specific mitochondrial enzymes, including aconitase and superoxide dismutases (SOD1, SOD2), and respiratory complex activities.

Main Methods:

Quantification of mitochondrial aconitase activity, SOD1 and SOD2 expression, and respiratory complex enzyme activities in platelets.
Measurement of mitochondrial lipid peroxidation and expression levels of SOD1 and cytochrome c.

Main Results:

MS patients exhibited higher mitochondrial aconitase activity and increased respiratory complex activities compared to controls.
Significantly elevated mitochondrial lipid peroxidation was observed in MS patients.
Cytochrome c expression decreased by 44% while mitochondrial SOD1 expression increased by 46% in MS patients.

Conclusions:

Platelets of MS patients display significant alterations in mitochondrial aerobic metabolism.
Changes in mitochondrial SOD1 and cytochrome c expression highlight oxidative stress and altered mitochondrial function in MS platelets.