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Enhancement of peritoneal macrophages reduces postoperative peritoneal adhesion formation
A Ar'Rajab1, I Dawidson, J Sentementes
1Department of Surgery, University of Texas Southwestern Medical Center at Dallas 75235-9031.
Abstract:
Postoperative adhesion formation results from a fibroproliferative inflammatory reaction. Macrophages are critical in the final resolution of the inflammatory process and tissue repair, including modulation of proliferation and differentiation of fibroblasts and secretion of neutral proteases like plasminogen activator. We, therefore, studied the influence of peritoneal macrophage enhancement on postoperative adhesion formation in five groups of rabbits. Group 1 was a control with normal peritoneum. Animals in group 2 had increased macrophage population in their peritoneum by intraperitoneal injection of protease peptone 3 days before adhesion induction. In group 3, animals were treated by protease peptone as in group 2 and then depleted of the increased macrophage population by peritoneal lavage before adhesion induction. In group 4 macrophages were transplanted from animals enriched as in group 2 into a nonenriched peritoneum at the time of adhesion induction. Group 5 had a normal peritoneum with peritoneal lavage before adhesion induction. Peritoneal adhesions were induced at laparotomy by repairing a peritoneal defect in two different models. It was found that enhancement of peritoneal macrophages by protease peptone reduced markedly the degree of postoperative adhesion formation. After depletion of the enhanced peritoneal macrophages by peritoneal lavage the degree of adhesion formation was equivalent to that of controls. Finally, macrophage transplantation into a nonenhanced macrophage peritoneum also reduced the degree of postoperative adhesion formation. It is concluded that enhancement of peritoneal macrophages reduces postoperative peritoneal adhesion formation.
Insights
Enhancing peritoneal macrophages significantly reduces postoperative adhesion formation. Macrophage transplantation and enrichment proved effective in preventing adhesions, highlighting their role in tissue repair.
Area of Science:
- Inflammation and immunology
- Surgical pathology
- Tissue repair mechanisms
Background:
- Postoperative adhesion formation is a common complication stemming from fibroproliferative inflammatory responses.
- Macrophages play a crucial role in resolving inflammation and facilitating tissue repair post-surgery.
- Understanding macrophage function is key to developing strategies for preventing surgical adhesions.
Purpose of the Study:
- To investigate the impact of enhancing peritoneal macrophage populations on the development of postoperative adhesions.
- To evaluate the efficacy of macrophage enrichment, depletion, and transplantation in modulating adhesion formation.
Main Methods:
- Five groups of rabbits were utilized, including controls, macrophage-enhanced groups, depleted groups, and transplanted groups.
- Macrophage populations were manipulated using protease peptone injections and peritoneal lavage.
- Peritoneal adhesions were induced surgically by repairing peritoneal defects in two distinct models.
Main Results:
- Enhancement of peritoneal macrophages via protease peptone markedly reduced postoperative adhesion formation.
- Depletion of enhanced macrophages by peritoneal lavage restored adhesion formation to control levels.
- Transplantation of enriched macrophages into non-enhanced peritoneums also significantly decreased adhesion formation.
Conclusions:
- Augmenting peritoneal macrophage populations effectively reduces the incidence and severity of postoperative adhesions.
- Macrophages are critical mediators in the resolution of surgical inflammation and prevention of adhesion formation.
- Targeting peritoneal macrophages presents a promising therapeutic strategy for minimizing surgical complications.