Related Experiment Videos
Experimental mast cell activation improves connective tissue repair in the perforated rat mesentery
L Franzén1, R Ghassemifar, P Malcherek
1Department of Pathology II, University Hospital, Linköping, Sweden.
Abstract:
The participation of mast cells in connective tissue repair was studied using the perforated-rat-mesentery model. Perforation of mesenteric membranes was performed during laparotomy of anesthetized Sprague-Dawley rats. Laparotomy significantly reduced the histamine content of the mesenteric membranes on day 1 postoperatively and perforation as such reduced the histamine content even more on days 1-10. Mast cell activation induced by a single intraperitoneal injection of Compound 48/80 two days prior to operation, significantly improved healing on days 5-7 postoperatively. Daily injections of Compound 48/80 for 5 days prior to operation showed significantly better healing compared to such injections for five days postoperatively. Administration of lupitidine, a long acting histamine H2-receptor antagonist, two times daily starting on the day of 48/80 injection to day 4 after operation did not apparently affect healing. The results indicate that mast cells may be activated during normal wound healing and that a preoperative, pharmacological activation improves healing. Furthermore, histamine does not seem to be of major importance for the beneficial effect of such mast cell activation on connective tissue repair.
Insights
Activating mast cells before surgery significantly enhances connective tissue repair in rats. This healing improvement, driven by mast cell activation, does not appear to depend on histamine levels.
Area of Science:
- Wound healing research
- Connective tissue biology
- Mast cell function
Background:
- Mast cells play a role in tissue repair.
- Understanding mast cell involvement in wound healing is crucial for therapeutic development.
Purpose of the Study:
- To investigate the role of mast cells in connective tissue repair.
- To determine if pharmacological mast cell activation can enhance wound healing.
- To assess the contribution of histamine to mast cell-mediated repair.
Main Methods:
- Utilized a perforated-rat-mesentery model for studying connective tissue repair.
- Administered Compound 48/80 to induce mast cell activation.
- Evaluated healing outcomes following preoperative and postoperative mast cell activation.
- Assessed the impact of the histamine H2-receptor antagonist lupitidine on healing.
Main Results:
- Perforation of mesenteric membranes reduced histamine content post-surgery.
- Preoperative mast cell activation with Compound 48/80 significantly improved healing.
- Preoperative activation was more effective than postoperative activation.
- Lupitidine administration did not significantly affect healing, suggesting histamine is not the primary mediator.
Conclusions:
- Mast cells are activated during normal wound healing.
- Preoperative pharmacological mast cell activation enhances connective tissue repair.
- Histamine's role in the beneficial effects of mast cell activation on repair appears minor.