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Kinetics of interleukin-1 secretion by murine macrophages recovered from the peritoneal cavity after surgery
H Abe1, K E Rodgers, D Ellefson
1Department of Obstetrics and Gynecology, University of Southern California School of Medicine, Los Angeles 90033.
Insights
This study shows that interleukin-1 (IL-1) production by macrophages increases later in wound healing. Macrophage responsiveness to stimuli changes post-surgery, suggesting IL-1
Area of Science:
- Immunology
- Wound Healing Research
- Surgical Recovery
Background:
- Macrophages are crucial for wound healing post-surgery.
- Interleukin-1 (IL-1) is a key soluble factor involved in regulating cells in surgical wounds.
Purpose of the Study:
- To quantify IL-1 production by macrophages from surgical exudate.
- To assess the functional activity of macrophages post-surgery by measuring IL-1 levels with and without stimulation.
Main Methods:
- Murine macrophages were harvested via peritoneal lavage at various time points after surgery.
- IL-1 levels were measured in cell culture supernatants, both unstimulated and stimulated with lipopolysaccharide (LPS) and phorbol myristate acetate (PMA).
Main Results:
- Macrophage numbers peaked on Postsurgical Day 3.
- Unstimulated macrophages showed gradually increasing IL-1 levels, peaking on Day 10.
- Stimulated macrophages produced significantly higher IL-1 levels, peaking on Postsurgical Day 3.
Conclusions:
- Macrophage susceptibility to stimuli evolves during the wound healing process.
- IL-1 likely contributes more significantly to the later stages of peritoneal repair rather than the early phase.
Abstract:
Macrophages play a central role in wound healing after surgical injury possibly through the secretion of soluble factors like interleukin-1 (IL-1). IL-1 has many biological activities which regulate most of the cell types that appear in postsurgical wounds. In this study, we determined the levels of IL-1 production by murine macrophages harvested from postsurgical exudate at several time points after standardized peritoneal surgery. To further characterize the level of functional activities of postsurgical macrophages, the IL-1 levels were determined with or without stimulating the cells with lipopolysaccharide (LPS) and phorbol myristate acetate (PMA). After surgery, the number of macrophages harvested by peritoneal lavage increased, reached peak levels on Postsurgical Day 3, and then decreased. IL-1 levels secreted by macrophages cultured without stimuli gradually increased after surgery, reaching peak levels on Day 10. In conditioned media from LPS-PMA-stimulated macrophages, IL-1 levels were significantly greater than in media from unstimulated macrophages and peaked on Postsurgical Day 3. These data suggest that the susceptibility of postsurgical macrophages to stimuli changes during the postsurgical wound healing process. Accordingly, IL-1 may play an important role in the late rather than in the early phase of peritoneal repair.