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Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue
Published on: March 23, 2015
Preparative isolation of peroxisomes from liver and kidney using metrizamide density gradient centrifugation in a
Abstract:
A method for the preparative isolation of peroxisomes from the livers of rat, guinea pig, and mouse, and also from rat kidney is described. The light mitochondrial fraction, i.e., particles sedimenting between 33,000 and 250,000g-min, or the postnuclear supernatant of liver or kidney, is subjected to a 20-50% Metrizamide density gradient ultracentrifugation in a vertical rotor. After centrifugation, the peroxisomes (marker enzyme catalase and dihydroxyacetone phosphate acyltransferase) sedimented as a band near the bottom of the tube (rho = 1.22 g/ml). From the distribution of different marker enzymes and also from the morphometric examinations, it was demonstrated that the isolated peroxisomes are not contaminated with lysosomes, mitochondria, or microsomes.
Insights
This study details a new method for isolating peroxisomes from rodent liver and kidney using Metrizamide density gradient ultracentrifugation. The technique yields pure peroxisomes, crucial for studying cellular functions.
Area of Science:
- Biochemistry
- Cell Biology
- Subcellular Fractionation
Background:
- Peroxisomes are vital organelles involved in various metabolic processes.
- Efficient isolation of pure peroxisomes is essential for biochemical and cell biology research.
- Previous methods may result in contamination with other cellular components.
Purpose of the Study:
- To develop and describe a preparative method for isolating peroxisomes.
- To ensure the purity of isolated peroxisomes from common contaminants.
- To provide a reliable technique for obtaining peroxisomes from rodent liver and kidney.
Main Methods:
- Utilized light mitochondrial fraction or postnuclear supernatant from rat, guinea pig, and mouse liver, and rat kidney.
- Employed 20-50% Metrizamide density gradient ultracentrifugation in a vertical rotor.
- Identified peroxisomes using marker enzymes like catalase and dihydroxyacetone phosphate acyltransferase.
Main Results:
- Peroxisomes were successfully isolated as a distinct band at a density of 1.22 g/ml.
- Marker enzyme distribution and morphometric analysis confirmed high purity.
- Isolated peroxisomes showed no significant contamination from lysosomes, mitochondria, or microsomes.
Conclusions:
- The described Metrizamide density gradient ultracentrifugation is an effective method for preparative peroxisome isolation.
- This technique provides highly pure peroxisomes suitable for detailed biochemical and cellular studies.
- The method is applicable to peroxisome isolation from both liver and kidney tissues.
