CD4+ T cell-derived NGAL modifies the outcome of ischemic acute kidney injury

Sul A. Lee, Sanjeev Noel, Johanna T. Kurzhagen, Mohanraj Sadasivam, Phillip M. Pierorazio, Lois J. Arend, Abdel R. Hamad, Hamid Rabb

Research output: Contribution to journalArticle

Abstract

CD4+ T cells mediate the pathogenesis of ischemic and nephrotoxic acute kidney injury (AKI). However, the underlying mechanisms of CD4+ T cell-mediated pathogenesis are largely unknown.We therefore conducted unbiased RNA-sequencing to discover novel mechanistic pathways of kidney CD4+ T cells after ischemia compared with normal mouse kidney. Unexpectedly, the lipocalin-2 (Lcn2) gene, which encodes neutrophil gelatinase-associated lipocalin (NGAL) had the highest fold increase (∼60). The NGAL increase in CD4+ T cells during AKI was confirmed at the mRNA level with quantitative real-time PCR and at the protein level with ELISA. NGAL is a potential biomarker for the early detection of AKI and has multiple potential biological functions. However, the role of NGAL produced by CD4+ T cells is not known. We found that ischemic AKI in NGAL knockout (KO) mice had worse renal outcomes compared with wild-type (WT) mice. Adoptive transfer of NGAL-deficient CD4+ T cells from NGAL KO mice into CD4 KO or WT mice led to worse renal function than transfer of WT CD4+ T cells. In vitro-simulated ischemia/reperfusion showed that NGAL-deficient CD4+ T cells express higher levels of IFN-g mRNA compared with WT CD4+ T cells. In vitro differentiation of naive CD4+ T cells to Th17, Th1, and Th2 cells led to significant increase in Lcn2 expression. Human kidney CD4+ T cell NGAL also increased significantly after ischemia. These results demonstrate an important role for CD4+ T cell NGAL as a mechanism by which CD4+ T cells mediate AKI and extend the importance of NGAL in AKI beyond diagnostics.

Original languageEnglish (US)
Pages (from-to)586-595
Number of pages10
JournalJournal of Immunology
Volume204
Issue number3
DOIs
StatePublished - Feb 1 2020

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ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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