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Effect of methylprednisolone on angiogenesis in syngeneic rat tracheal grafts
D E Smith1, T K Waddell, K N DeCampos
1Department of Surgery, University of Toronto, Ontario, Canada.
Abstract:
Airway anastomotic complications remain a cause of morbidity after clinical lung transplantation. The use of corticosteroid therapy to control pulmonary rejection has raised concern over delayed airway healing. We therefore investigated the hypothesis that the effects of methylprednisolone (MP) impair the revascularization and epithelial regeneration of heterotopic syngeneic tracheal isografts. Lewis rat tracheal segments were wrapped in omentum and implanted in the abdomen of recipient rats. All recipients received cyclosporin A (CsA) (5 mg.kg-1.day-1) and were randomly allocated into three groups of 12 rats each according to the daily MP dose: group II, no MP; group III, 1 mg.kg-1.day-1; and group IV, 2 mg.kg-1.day-1. In each group, 6 animals were sacrificed after 7 and 14 days. Normal, untreated rats served as controls (group I). Epithelial regeneration was assessed histologically by a blinded subjective scoring system and by measurement of epithelial thickness. Tracheal revascularization was quantitated in terms of the number of blood vessels per square millimeter of tracheal wall and the vessel area was quantitated in terms of the percentage of the tracheal wall area. In animals treated with MP and CsA, the trachea exhibited significantly better regeneration after 14 days than it did in animals treated only with CsA. Epithelial regeneration was improved between 7 and 14 days in the groups treated with MP (group III, p = 0.01; group IV, p = 0.04). The epithelial thickness for all three study groups was significantly greater than that in the control group and returned toward normal after 14 days.(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
Methylprednisolone (MP) did not impair airway healing in lung transplant models. Instead, MP improved epithelial regeneration and revascularization in rat tracheal grafts, suggesting it may aid airway healing post-transplant.
Area of Science:
- Surgical Innovation
- Transplantation Immunology
- Regenerative Medicine
Background:
- Airway anastomotic complications are a significant concern in lung transplantation.
- Corticosteroid use for rejection may impede airway healing, necessitating further investigation.
Purpose of the Study:
- To investigate if methylprednisolone (MP) impairs revascularization and epithelial regeneration in tracheal isografts.
- To evaluate the impact of MP on airway healing in a lung transplant context.
Main Methods:
- Lewis rat tracheal segments were used as heterotopic syngeneic isografts.
- Rats received cyclosporin A (CsA) with varying daily doses of MP (0, 1, or 2 mg/kg).
- Epithelial regeneration and tracheal revascularization were assessed histologically and quantitatively at 7 and 14 days.
Main Results:
- MP treatment, combined with CsA, resulted in significantly better tracheal regeneration at 14 days compared to CsA alone.
- Epithelial regeneration and thickness improved over time in MP-treated groups.
- Tracheal revascularization showed improvements in MP-treated groups.
Conclusions:
- Contrary to concerns, methylprednisolone (MP) did not impair but rather enhanced airway healing in this rat tracheal graft model.
- MP may positively influence revascularization and epithelial regeneration, potentially beneficial for lung transplant recipients.