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Updated: May 8, 2026
Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue
Published on: March 23, 2015
Preservation of mitochondrial functional integrity in mitochondria isolated from small cryopreserved mouse brain
Daniela Valenti1, Lidia de Bari, Bianca De Filippis
1Institute of Biomembranes and Bioenergetics, National Council of Research, 70126 Bari, Italy.
Abstract:
Studies of mitochondrial bioenergetics in brain pathophysiology are often precluded by the need to isolate mitochondria immediately after tissue dissection from a large number of brain biopsies for comparative studies. Here we present a procedure of cryopreservation of small brain areas from which mitochondrial enriched fractions (crude mitochondria) with high oxidative phosphorylation efficiency can be isolated. Small mouse brain areas were frozen and stored in a solution containing glycerol as cryoprotectant. Crude mitochondria were isolated by differential centrifugation from both cryopreserved and freshly explanted brain samples and were compared with respect to their ability to generate membrane potential and produce ATP. Intactness of outer and inner mitochondrial membranes was verified by polarographic ascorbate and cytochrome c tests and spectrophotometric assay of citrate synthase activity. Preservation of structural integrity and oxidative phosphorylation efficiency was successfully obtained in crude mitochondria isolated from different areas of cryopreserved mouse brain samples. Long-term cryopreservation of small brain areas from which intact and phosphorylating mitochondria can be isolated for the study of mitochondrial bioenergetics will significantly expand the study of mitochondrial defects in neurological pathologies, allowing large comparative studies and favoring interlaboratory and interdisciplinary analyses.
Insights
Cryopreservation of small mouse brain areas allows for the isolation of intact mitochondria. This method enables robust studies of mitochondrial bioenergetics in neurological diseases.
Area of Science:
- Neuroscience
- Mitochondrial Biology
- Biochemistry
Background:
- Studying mitochondrial bioenergetics in brain pathophysiology is challenging due to the immediate need for fresh tissue.
- Current methods limit comparative analyses of mitochondrial function in neurological disorders.
Purpose of the Study:
- To develop and validate a cryopreservation method for small brain areas to isolate functional mitochondria.
- To enable long-term storage and facilitate large-scale comparative studies of mitochondrial function.
Main Methods:
- Small mouse brain areas were cryopreserved using glycerol as a cryoprotectant.
- Crude mitochondria were isolated via differential centrifugation from both fresh and cryopreserved samples.
- Mitochondrial function was assessed by measuring membrane potential, ATP production, and structural integrity.
Main Results:
- Cryopreserved brain samples yielded mitochondrial fractions with high oxidative phosphorylation efficiency.
- Isolated mitochondria retained structural integrity of outer and inner membranes.
- Functional assays confirmed the viability and bioenergetic capacity of mitochondria from cryopreserved tissue.
Conclusions:
- This cryopreservation technique successfully preserves the integrity and function of mitochondria isolated from mouse brain.
- The method facilitates the study of mitochondrial bioenergetics in neurological pathologies by enabling sample storage and large comparative analyses.
- This approach supports interlaboratory and interdisciplinary research on mitochondrial defects in brain disorders.
