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Functions of purified mouse neutrophils isolated from gelatin sponges
1Department of Medicine, National Jewish Center for Immunology and Respiratory Medicine, Denver, Colorado 80206.
Abstract:
When sterile gelatin sponges are implanted under the skin of a mouse and retrieved 6 hr later, approximately 10(6) neutrophils per mouse, in a 98-99% pure population, may be retrieved by simply squeezing and rinsing the sponges. These neutrophils behave similarly to peritoneal exudate neutrophils in chemotaxis and phagocytosis assays, but are bacteriostatic rather than bactericidal. The sponge method yields substantially more neutrophils than could be obtained by exsanguinating the mouse and isolating blood neutrophils, and a 5-fold purer population than is normally obtained by passage of peritoneal exudate cells over Ficoll. In addition, sponge-elicited neutrophils may be ready for use within a half hour after removal from the mouse, without being exposed to osmotic shock or Ficoll.
Insights
A novel sterile gelatin sponge method efficiently isolates high-purity neutrophils from mice. This technique provides more neutrophils faster than traditional methods for research applications.
Area of Science:
- Immunology
- Cell Biology
Background:
- Neutrophils are critical immune cells involved in host defense.
- Current methods for isolating neutrophils, such as peritoneal lavage or blood collection, yield limited quantities or lower purity.
- Efficient and rapid isolation of pure neutrophils is essential for various immunological studies.
Purpose of the Study:
- To develop and validate a novel method for isolating neutrophils using sterile gelatin sponges.
- To compare the yield, purity, and functional characteristics of neutrophils isolated by the sponge method with conventional techniques.
Main Methods:
- Sterile gelatin sponges were implanted subcutaneously in mice for 6 hours.
- Neutrophils were retrieved by squeezing and rinsing the sponges.
- The purity and functional assays (chemotaxis, phagocytosis, bacteriostatic/bactericidal activity) of retrieved neutrophils were assessed.
Main Results:
- Approximately 10(6) neutrophils of 98-99% purity were retrieved per mouse.
- Sponge-elicited neutrophils exhibited similar chemotaxis and phagocytosis to peritoneal exudate neutrophils.
- These neutrophils demonstrated bacteriostatic, but not bactericidal, activity.
- The sponge method yielded significantly more neutrophils than blood isolation and higher purity than Ficoll separation.
Conclusions:
- Subcutaneous implantation of sterile gelatin sponges provides an effective and rapid method for isolating large numbers of pure neutrophils.
- This technique offers advantages over traditional methods in terms of yield, purity, and speed.
- Sponge-elicited neutrophils are suitable for functional studies, offering a valuable tool for immunological research.