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Isolation of mitochondria, lysosomes, and microsomes from the rat ventral prostate with a note on inverted microsomal
Abstract:
A procedure is presented for the isolation of lysosomes, mitochondria, and microsomes from the rat ventral prostate with relatively good yield. Homogenization was performed with a Polytron homogenizer or in combination with the Potter-Elvehjem device. Reasonably pure mitochondria and lysosomes could only be obtained using a Metrizamide gradient, whereas it was possible to prepare pure microsomal fractions by differential centrifugation in sucrose. The purity of the lysosomes and mitochondria was 90 and 85%, respectively, as judged by the presence of different marker enzymes. These findings were confirmed by ultrastructural analyses. Electron micrographs of the isolated lysosomes showed intact lysosomes surrounded by a single membrane. The lysosomes contained intramatrical vesicles with lipid-like material. Vesicles derived from the endoplasmic reticulum in the microsomal fraction ranged from 70 to 90% depending on the centrifugal force used to sediment the mitochondrial fraction. Electron micrographs of the microsomal fraction showed that about 40% of the vesicles were inverted and turned "inside-out", i.e., having their ribosomes attached to the inside of the vesicles. By fractionation of ethylenediaminetetraacetate treated microsomes on a sucrose gradient a partially purified fraction was isolated which consisted of 65% of inverted microsomes.
Insights
Researchers developed a new method to isolate rat ventral prostate lysosomes, mitochondria, and microsomes. This procedure uses Metrizamide gradients and differential centrifugation, achieving high purity for these cellular components.
Area of Science:
- Cell Biology
- Biochemistry
- Proteomics
Background:
- Subcellular fractionation is crucial for studying cellular components.
- Previous methods for isolating rat ventral prostate organelles have limitations in yield and purity.
Purpose of the Study:
- To establish an efficient procedure for isolating lysosomes, mitochondria, and microsomes from the rat ventral prostate.
- To achieve high purity of isolated organelles for further biochemical and ultrastructural analysis.
Main Methods:
- Homogenization using a Polytron homogenizer, with or without a Potter-Elvehjem device.
- Isolation of mitochondria and lysosomes via Metrizamide density gradients.
- Preparation of microsomal fractions through differential centrifugation in sucrose.
Main Results:
- High purity achieved for isolated lysosomes (90%) and mitochondria (85%), confirmed by marker enzymes and ultrastructural analysis.
- Microsomal fractions prepared by differential centrifugation showed 70-90% purity.
- Ultrastructural analysis revealed intact lysosomes and a significant proportion (40%) of inverted microsomes.
Conclusions:
- The described procedure provides a reliable method for obtaining pure lysosomes, mitochondria, and microsomes from rat ventral prostate.
- The findings highlight the effectiveness of Metrizamide gradients for organelle purification.
- The characterization of microsomal vesicle orientation is important for understanding endoplasmic reticulum-derived structures.