Nox2 is a mediator of chronic CsA nephrotoxicity

A. Djamali, S. Reese, O. Hafez, A. Vidyasagar, L. Jacobson, W. Swain, C. Kolehmainen, L. Huang, N. A. Wilson, J. R. Torrealba

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We hypothesized that Nox2, the classical phagocytic NADPH oxidase, plays an important role in calcineurin inhibitor (CNI)-induced renal fibrosis. We tested this hypothesis in vitro, in animal and in human studies. Cyclosporine A (CsA) and tacrolimus (TAC) were associated with greater levels of Nox2 mRNA and epithelial to mesenchymal transition (EMT) in NRK52E cells. CsA increased Nox2, α-SMA and phosphorylated-p38MAPK, Smad3 and NFκB proteins. Nox2 upregulation and EMT were inhibited in TGF-β1 knockout cells suggesting that TGF-β1 is required for Nox2 activation. Fisher344 rats treated with high dose CsA showed increased Nox2 in the tubulointerstitium and greater Nox2, α-SMA, phosphorylated Smad3 and nitrotyrosine by immunoblot analyses. Inhibition of Nox2 by coadministration of apocynin or diphenyleneiodonium was associated with reduced fibrogenesis. We validated these findings by treating wild type and Nox2 null (B6.129S-CybbTm1Din/J) mice with high dose CsA. Western blot analyses confirmed the absence of Nox2 and significantly lower levels of α-SMA and 4-hydroxynonenal (HNE) in CsA-treated knockout mice. These findings were clinically relevant since Nox2 and α-SMA were increased in the tubulointerstitium of kidneys from 15 liver transplant recipients with biopsy-confirmed chronic CsA or TAC nephrotoxicity. In conclusion, specific Nox2 inhibition strategies may improve chronic CNI nephrotoxicity in solid organ transplantation. Using in vitro animal and human studies, the authors demonstrate that Nox2, the classic phagocytic NADPH oxidase, plays an important role in calcineurin inhibitor (CNI)-induced renal fibrosis.

Original languageEnglish (US)
Pages (from-to)1997-2007
Number of pages11
JournalAmerican Journal of Transplantation
Volume12
Issue number8
DOIs
StatePublished - Aug 2012

Fingerprint

Cyclosporine
Epithelial-Mesenchymal Transition
NADPH Oxidase
Tacrolimus
Kidney
Smad3 Protein
Fibrosis
Organ Transplantation
Knockout Mice
Up-Regulation
Western Blotting
Biopsy
Messenger RNA
Liver
Calcineurin Inhibitors
In Vitro Techniques

Keywords

  • CsA
  • EMT
  • fibrosis
  • Nox2
  • oxidative stress

ASJC Scopus subject areas

  • Transplantation
  • Immunology and Allergy
  • Pharmacology (medical)

Cite this

Djamali, A., Reese, S., Hafez, O., Vidyasagar, A., Jacobson, L., Swain, W., ... Torrealba, J. R. (2012). Nox2 is a mediator of chronic CsA nephrotoxicity. American Journal of Transplantation, 12(8), 1997-2007. https://doi.org/10.1111/j.1600-6143.2012.04081.x

Nox2 is a mediator of chronic CsA nephrotoxicity. / Djamali, A.; Reese, S.; Hafez, O.; Vidyasagar, A.; Jacobson, L.; Swain, W.; Kolehmainen, C.; Huang, L.; Wilson, N. A.; Torrealba, J. R.

In: American Journal of Transplantation, Vol. 12, No. 8, 08.2012, p. 1997-2007.

Research output: Contribution to journalArticle

Djamali, A, Reese, S, Hafez, O, Vidyasagar, A, Jacobson, L, Swain, W, Kolehmainen, C, Huang, L, Wilson, NA & Torrealba, JR 2012, 'Nox2 is a mediator of chronic CsA nephrotoxicity', American Journal of Transplantation, vol. 12, no. 8, pp. 1997-2007. https://doi.org/10.1111/j.1600-6143.2012.04081.x
Djamali A, Reese S, Hafez O, Vidyasagar A, Jacobson L, Swain W et al. Nox2 is a mediator of chronic CsA nephrotoxicity. American Journal of Transplantation. 2012 Aug;12(8):1997-2007. https://doi.org/10.1111/j.1600-6143.2012.04081.x
Djamali, A. ; Reese, S. ; Hafez, O. ; Vidyasagar, A. ; Jacobson, L. ; Swain, W. ; Kolehmainen, C. ; Huang, L. ; Wilson, N. A. ; Torrealba, J. R. / Nox2 is a mediator of chronic CsA nephrotoxicity. In: American Journal of Transplantation. 2012 ; Vol. 12, No. 8. pp. 1997-2007.
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