Simple and Efficient Protocol for Subcellular Fractionation of Normal and Apoptotic Cells

Area of Science:

• Biochemistry
• Cell Biology
• Molecular Biology

Background:

• Subcellular fractionation is crucial for studying protein function and intracellular events.
• Apoptosis involves significant protein translocation, necessitating reliable fractionation methods for apoptotic cells.
• Standard protocols often yield contaminated fractions due to apoptotic bodies and cell debris.

Purpose of the Study:

• To compare different nucleus/cytoplasm fractionation methods.
• To identify and validate the most effective approach for separating nuclear and cytoplasmic contents, especially in apoptotic cells.
• To enable further subdivision of nuclear fractions for detailed protein analysis.

Main Methods:

• Stepwise cell lysis using non-ionic detergents like NP-40.
• Washing of isolated nuclei to remove contaminants.
• Validation of the method using cells treated with various apoptotic stimuli.
• Demonstration of nuclear fraction subdivision into nucleosolic and insoluble subfractions.

Main Results:

• A superior nucleus/cytoplasm fractionation method was selected and validated.
• The method effectively separates nuclear and cytoplasmic components, minimizing contamination from apoptotic bodies.
• The nuclear fraction can be further processed into nucleosolic and insoluble subfractions.
• The technique is applicable to both normal and apoptotic cells.

Conclusions:

• A simple, efficient, and validated method for nucleus/cytoplasm fractionation of normal and apoptotic cells has been developed.
• This methodology facilitates accurate isolation and functional studies of proteins during apoptosis.
• The ability to subdivide nuclear fractions enhances proteomic research capabilities.