Persistent renal and extrarenal immune changes after severe ischemic injury

Melissa J. Burne-Taney, Naoko Yokota, Hamid Rabb

Research output: Contribution to journalArticle

Abstract

Background. Renal ischemia/reperfusion (I/R) injury is associated with delayed graft function and decreased long-term allograft function. However, most experimental studies evaluating renal I/R injury have focused on acute events after ischemia. T cells are potential candidates to link preservation injury, alloimmunity, and fibrosis. We hypothesized that severe renal I/R injury would generate long-term kidney damage and immune changes. Methods. C57BL/6 mice underwent 60 minutes of warm unilateral I/R injury or sham surgery and were studied for 6 weeks. Serum creatinine, renal histology, and albumin excretion were measured. Phagocyte infiltration, CD4+ infiltration, renal cytokine expression, and splenic lymphocyte intracellular cytokine production were also measured in mice at 6 weeks. Results. Serum creatinine levels rose following 60 minutes of unilateral I/R injury compared to sham mice. Histologic analysis of ischemic kidneys at 6 weeks revealed a pronounced loss of tubular architecture and infiltration of inflammatory cells. Phagocyte and CD4+ T-cell infiltration were significantly increased in ischemic kidneys. This was accompanied by a significant increase in interleukin (IL)-1β and regulated upon activation, normal T-cell expressed and secreted (RANTES) expression. Despite similar splenic CD4 and CD8 numbers, intracellular cytokine staining of T cells revealed a significant increase in interferon-gamma (IFN-γ) in I/R injury mice compared to sham mice. Conclusion. Persistent renal and extrarenal immune responses occur after a single episode of severe I/R injury. These immune processes resulting from injury could in turn have long-term consequences on progression of renal disease in transplanted and native kidneys.

Original languageEnglish (US)
Pages (from-to)1002-1009
Number of pages8
JournalKidney International
Volume67
Issue number3
DOIs
Publication statusPublished - Mar 2005
Externally publishedYes

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Keywords

  • Inflammation
  • Progressive renal disease
  • T cells

ASJC Scopus subject areas

  • Nephrology

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