Abstract
Increasing evidence suggests that interleukin (IL)-17A plays an important role in chronic lung allograft dysfunction (CLAD), characterized by airway and lung parenchymal fibrosis, after lung transplantation. Halofuginone is a plant derivative that has been shown to inhibit Th17 differentiation. The purpose of this study was to examine the effect of halofuginone on CLAD development using a minor alloantigen‒mismatched mouse orthotopic lung transplant model. C57BL/6 recipient mice received an orthotopic left lung transplant from C57BL/10 donors, mismatched for minor antigens. Lung transplant recipients received daily intraperitoneal injections of 2.5 μg halofuginone or vehicle alone. Lung grafts were assessed on Days 7, 14, and 28 post-transplant. Compared with control mice, on Day 28 post-transplant, lung grafts of mice treated with halofuginone showed a significant reduction in the percentage of obliterated airways (6.8 ± 4.7% vs 52.5 ± 13.8%, p < 0.01), as well as significantly reduced parenchymal fibrosis (5.5 ± 2.3% vs 35.9 ± 10.9%, p < 0.05). Immunofluorescent staining for IL-17A demonstrated a decreased number and frequency of IL-17A‒positive cells in halofuginone-treated lung grafts on Day 28, as compared with controls. H...Continue Reading
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