Abstract:
BACKGROUND:Obliterative bronchiolitis (OB), chronic allograft rejection of the lung, is a major cause of morbidity and mortality after lung transplantation. Previous studies using the heterotopic mouse trachea model of chronic airway rejection have shown a T cell infiltrate composed of CD4+ and CD8+ T cells. The goal of these experiments was to characterize the pattern of T lymphocyte cytokines during chronic airway rejection using the heterotopic mouse trachea model. METHODS:Isografts (BALB/c into BALB/c) and allografts (BALB/c into C57BL/6) were implanted into cyclosporin-treated animals and harvested 2, 4, 6, and 10 weeks posttransplant. Cytokine mRNA expression in these grafts was determined using reverse transcription polymerase chain reactions. Expression of Th1 cytokines, interleukin- (IL) 2 and gamma-interferon, and Th2 cytokines, IL-4, and IL-10 were analyzed, as well as the cytotoxic lymphocyte product granzyme B and expressed relative to beta-actin gene expression. RESULTS:In allografts, expression of IL-2 (P=0.002), gamma-interferon (P=2x10(-6)), granzyme B (P=0.003), IL-4 (P=0.06), and IL-10 (P=8x10(-6)) were 2- to 10-fold higher compared to isografts throughout the time-course of graft injury. Th1 and cytotoxic lymphocyte gene expression were increased to a greater extent than Th2 cytokines in allografts compared with isografts, and both Th1 and Th2 cytokine gene expression persisted at 6-10 weeks. CONCLUSIONS:These data suggest that Th1, Th2, and cytotoxic lymphocyte subtypes all contribute to the development of obliterative bronchiolitis in the heterotopic mouse trachea model. Efforts to reduce the development of obliterative bronchiolitis may require the antagonism of multiple T cell pathways.
journal_name
Transplantationjournal_title
Transplantationauthors
Neuringer IP,Walsh SP,Mannon RB,Gabriel S,Aris RMdoi
10.1097/00007890-200002150-00016subject
Has Abstractpub_date
2000-02-15 00:00:00pages
399-405issue
3eissn
0041-1337issn
1534-6080journal_volume
69pub_type
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