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Sequential preparation of rat liver microsomal and Golgi membranes
Abstract:
A new procedure for the preparation of microsomes, microsomal subfractions and Golgi membranes from the same piece of rat liver has been developed. The smallest amount of liver with which the preparation can be performed is about 1 g (wet weight). 35% of the total activity of marker enzymes for the endoplasmic reticulum was recovered in the microsomal fraction. This recovery is approximately the same as that obtained in our laboratories using other procedures. Golgi membranes, mitochondria, lysosomes and plasma membranes represent less than 13% of the microsomal protein as calculated on the basis of marker enzymes. Golgi membranes must be prepared in two steps to achieve a reasonable recovery and thus a representative sample containing both very low density lipoprotein-rich Golgi vesicles and the heavier cisternal elements. The recovery of UDP-galactosyltransferase activity in the Golgi fraction from the livers of alcohol-treated animals is around 30% of the total activity in the total particulate fraction.
Insights
A novel rat liver preparation method yields microsomes and Golgi membranes. This technique efficiently isolates cellular components for biochemical analysis, aiding liver research.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Subcellular fractionation is crucial for studying organelle function.
- Existing methods for isolating microsomes and Golgi membranes can be labor-intensive and may yield limited quantities.
- Rat liver is a common model system for investigating cellular processes.
Purpose of the Study:
- To develop a new, efficient procedure for simultaneously preparing microsomes and Golgi membranes from rat liver.
- To assess the yield and purity of the isolated fractions.
- To evaluate the applicability of the method for studying liver components, including in alcohol-treated animals.
Main Methods:
- A single-step procedure for preparing microsomes and Golgi membranes from approximately 1g of rat liver (wet weight).
- Characterization of microsomal fraction purity using marker enzymes for endoplasmic reticulum, mitochondria, lysosomes, and plasma membranes.
- A two-step method for Golgi membrane preparation to ensure recovery of diverse vesicle populations.
- Assay of UDP-galactosyltransferase activity as a marker for Golgi function.
Main Results:
- The microsomal fraction achieved 35% recovery of endoplasmic reticulum marker enzyme activity, comparable to existing methods.
- Contamination of the microsomal fraction by other organelles (mitochondria, lysosomes, plasma membranes) was less than 13%.
- The two-step Golgi preparation method yielded approximately 30% recovery of UDP-galactosyltransferase activity in alcohol-treated animals.
Conclusions:
- A new, efficient procedure for simultaneous isolation of rat liver microsomes and Golgi membranes has been established.
- The method provides high purity and reasonable recovery of subcellular fractions, suitable for biochemical analysis.
- This technique facilitates the study of liver cell components and their functions, even in altered physiological states like alcohol treatment.