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A comparison of techniques for introducing macromolecules into living cells
1Department of Medicine, Columbia University, New York, New York 10032.
Cytometry
|January 1, 1993
Summary
Osmotic lysis of pinosomes (OLP) is an effective method for introducing macromolecules into cells. This technique offers advantages in simplicity, uniform cell labeling, and high viability for cell-based assays.
Area of Science:
- Cell biology
- Biotechnology
Background:
- Introducing macromolecules into living cells is crucial for various biological studies and therapeutic applications.
- Several methods exist, each with limitations in efficiency, uniformity, or cell viability.
Purpose of the Study:
- To evaluate and compare three techniques for macromolecule delivery into living cells: red blood cell ghost fusion (RBCF), osmotic lysis of pinosomes (OLP), and scrape loading (SL).
- To identify the most advantageous method for efficient and uniform macromolecule delivery while maintaining cell viability.
Main Methods:
- Flow cytometry was utilized to assess the efficiency and uniformity of macromolecule delivery.
- Techniques compared included cell fusion with fluorescently labeled red blood cell ghosts (RBCF), osmotic lysis of pinosomes (OLP) using hypertonic and hypotonic solutions, and scrape loading (SL) involving mechanical membrane disruption.
Main Results:
- Osmotic lysis of pinosomes (OLP) demonstrated superior performance compared to RBCF and SL.
- OLP is a simple procedure resulting in virtually all cells being fluorescently labeled.
- This method enables uniform loading of larger quantities of material into cells, maintaining excellent cell viability.
Conclusions:
- Osmotic lysis of pinosomes (OLP) is a highly effective and advantageous technique for introducing macromolecules into living cells.
- OLP offers significant benefits including procedural simplicity, uniform and efficient labeling, and preservation of cell viability, making it suitable for various cell-based applications.