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Evaluation of the electroinjection method for introducing proteins into living cells
A K Wilson1, J Horwitz, P De Lanerolle
1Department of Physiology and Biophysics, College of Medicine, University of Illinois, Chicago 60612.
The American Journal of Physiology
|February 1, 1991
Summary
Electroinjection efficiently introduces large amounts of proteins into living cells, maintaining cell viability and function. This method is a promising tool for cellular research, enabling the study of regulatory mechanisms.
Area of Science:
- Cell Biology
- Biotechnology
- Molecular Biology
Background:
- Introducing impermeant probes like proteins into living cells is crucial for studying cellular regulation.
- Existing methods for protein delivery into cells have limitations in efficiency or cell viability.
Purpose of the Study:
- To evaluate a modified voltage-discharge technique, termed electroinjection, for delivering proteins into living cells.
- To assess the efficiency, viability, and physiological responsiveness of cells post-electroinjection.
Main Methods:
- Utilized a modified voltage-discharge technique (electroinjection) to transiently permeabilize the plasma membrane.
- Introduced antibodies and other proteins into cultured pheochromocytoma and other cells.
- Analyzed cell viability, physiological responsiveness, and protein incorporation efficiency.
Main Results:
- Electroinjection successfully introduced large quantities (micromolar) of proteins into millions of cells simultaneously.
- Cell viability and physiological responsiveness were maintained under optimized electroinjection conditions.
- Protein incorporation depended on field strength, capacitance, protein molecular weight, and buffer concentration.
Conclusions:
- Electroinjection is an efficient method for loading exogenous proteins into cells while preserving cellular integrity.
- The technique yields a single population of loaded cells, facilitating consistent experimental outcomes.
- Further optimization of parameters like capacitance can mitigate issues such as protein trapping in the plasma membrane.