Inducible nitric oxide synthase and apoptosis in murine proximal tubule epithelial cells

Manish M Tiwari, Kurt J. Messer, Philip R. Mayeux

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Since inducible nitric oxide synthase (iNOS) and proximal tubule injury are known to be critical determinants of lipopolysaccharide (LPS)-induced renal failure, the role of nitric oxide (NO) in proximal tubule cell apoptosis was examined. An 18-h treatment with a combination of LPS (5 μg/ml) and interferon-γ (IFN-γ, 100 units/ml) synergistically induced iNOS and produced a 20-fold increase in NO generation in the TKPTS murine proximal tubule cell line. NO generation by LPS + IFN-γ was blocked by a specific iNOS blocker, L-N6-(1-iminoethyl)-lysine (L-NIL, 1mM). To assess the role of iNOS-derived NO in proximal tubule cell apoptosis, annexin V- and propidium iodide-labeled cells were analyzed by flow cytometry. Neither the induction of iNOS nor its inhibition produced significant apoptotic cell death in TKPTS cells. Two exogenous NO donors were used to examine the role of NO more directly in proximal tubule apoptosis. Although both sodium nitroprusside (SNP), an iron-containing, nitrosonium cation donor, and S-nitroso-N-acetylpenicillamine (SNAP), a noniron-containing, NO generator, produced a concentration-dependent increase in NO generation, only SNP increased apoptotic cell death in TKPTS cells (5.9 ± 0.7% in control cells vs. 21.6 ± 3.8% in SNP [500μM]-treated cells; n = 4-9; p < 0.01). SNP-mediated tubule cell apoptosis was not dependent on the activation of caspases or p53 but was possibly related to the generation of reactive oxygen species by SNP. Thus, in TKPTS cells induction of iNOS and generation of NO by LPS does not lead to tubular epithelial cell death.

Original languageEnglish (US)
Pages (from-to)493-500
Number of pages8
JournalToxicological Sciences
Volume91
Issue number2
DOIs
StatePublished - Jun 1 2006

Fingerprint

Nitric Oxide Synthase Type II
Nitric Oxide
Epithelial Cells
Apoptosis
Nitroprusside
Lipopolysaccharides
Cell death
Cell Death
Cells
S-Nitroso-N-Acetylpenicillamine
Nitric Oxide Donors
Flow cytometry
Propidium
Annexin A5
Caspases
Interferons
Cations
Reactive Oxygen Species
Renal Insufficiency
Iron

Keywords

  • Apoptosis
  • Nitric oxide
  • Proximal tubule
  • S-nitroso-N-acetylpenicillamine
  • Sodium nitroprusside
  • iNOS

ASJC Scopus subject areas

  • Toxicology

Cite this

Inducible nitric oxide synthase and apoptosis in murine proximal tubule epithelial cells. / Tiwari, Manish M; Messer, Kurt J.; Mayeux, Philip R.

In: Toxicological Sciences, Vol. 91, No. 2, 01.06.2006, p. 493-500.

Research output: Contribution to journalArticle

Tiwari, Manish M ; Messer, Kurt J. ; Mayeux, Philip R. / Inducible nitric oxide synthase and apoptosis in murine proximal tubule epithelial cells. In: Toxicological Sciences. 2006 ; Vol. 91, No. 2. pp. 493-500.
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