Endogenous Toll-Like Receptor 9 Regulates AKI by Promoting Regulatory T Cell Recruitment
- 1 March 2016
- journal article
- research article
- Published by Ovid Technologies (Wolters Kluwer Health) in Journal of the American Society of Nephrology
- Vol. 27 (3), 706-714
- https://doi.org/10.1681/asn.2014090927
Abstract
Toll-like receptor 9 (TLR9) enhances proinflammatory responses, but whether it can act in a regulatory capacity remains to be established. In experimental murine AKI induced by cisplatin, Tlr9−/− mice developed enhanced renal injury and exhibited fewer intrarenal regulatory T cells (Tregs) compared with genetically intact mice. A series of reconstitution and depletion studies defined a role for TLR9 in maintaining Treg-mediated homeostasis in cisplatin-induced AKI. When Rag1−/− mice were reconstituted with nonregulatory CD25− splenocytes from wild-type (WT) or Tlr9−/− mice, AKI was similarly enhanced. However, when Rag1−/− mice were reconstituted with CD4+CD25+ regulatory cells, WT CD4+CD25+ cells were more renoprotective and localized to the kidney more efficiently than Tlr9−/− CD4+CD25+ cells. In Treg-depleted Foxp3DTR mice, reconstitution with naive WT CD4+CD25+ cells resulted in less severe AKI than did reconstitution with Tlr9−/− Tregs. Tlr9−/− mice were not deficient in CD4+CD25+ cells, and WT and TLR9-deficient Tregs had similar suppressive function ex vivo. However, expression of adhesion molecules important in Treg trafficking was reduced on peripheral CD4+CD25+ cells from Tlr9−/− mice. In conclusion, we identified a pathway by which TLR9 promotes renal Treg accumulation in AKI.This publication has 34 references indexed in Scilit:
- IL-33 Exacerbates Acute Kidney InjuryJournal of the American Society of Nephrology, 2011
- Cellular pathophysiology of ischemic acute kidney injuryJCI Insight, 2011
- Tim-1 promotes cisplatin nephrotoxicityAmerican Journal of Physiology-Renal Physiology, 2011
- TLR9 in Peritoneal B-1b Cells Is Essential for Production of Protective Self-Reactive IgM To Control Th17 Cells and Severe AutoimmunityThe Journal of Immunology, 2011
- CD73-Deficient Mice Have Increased Antitumor Immunity and Are Resistant to Experimental MetastasisCancer Research, 2011
- The Th17-Defining Transcription Factor RORγt Promotes GlomerulonephritisJournal of the American Society of Nephrology, 2011
- Phenotypical and functional specialization of FOXP3+ regulatory T cellsNature Reviews Immunology, 2011
- Toll‐like receptor 2 induces Th17 myeloperoxidase autoimmunity while Toll‐like receptor 9 drives Th1 autoimmunity in murine vasculitisArthritis & Rheumatism, 2010
- CD4+CD25+ regulatory T cells attenuate cisplatin-induced nephrotoxicity in miceKidney International, 2010
- Mechanisms of Cisplatin NephrotoxicityToxins, 2010