Role of caspases and NF-κB signaling in hydrogen peroxide- and superoxide-induced hepatocyte apoptosis

Brett E. Jones, Chau R. Lo, Hailing Liu, Zehra Pradhan, Lydia Garcia, Anu Srinivasan, Karen L. Valentino, Mark J. Czaja

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

Reactive oxygen intermediates (ROI) have been implicated as mediators of hepatocyte death resulting from a variety of forms of liver injury. To delineate the mechanisms that underlie ROI-induced apoptosis, the roles of caspase activation and nuclear factor-κB (NF-κB) signaling were determined in the rat hepatocyte cell line RALA255-10G after treatment with H2O2 or the superoxide generator menadione. By 8 h, H2O2 and menadione caused 26% and 33% cell death, respectively. Death from both ROI occurred by apoptosis as indicated by morphology under fluorescence microscopy, the induction of caspase activation and DNA fragmentation, and the cleavage of poly(ADP- ribose) polymerase. Despite the presence of caspase activation in both forms of apoptosis, caspase inhibition blocked H2O2- but not menadione-induced apoptosis. In contrast, inhibition of NF-κB activation decreased cell death from both ROI. Different ROI, therefore, induce distinct apoptotic pathways in RALA hepatocytes that are both caspase dependent and independent. In contrast to the known protective effect of NF-κB activation in tumor necrosis factor-α-induced hepatocyte apoptosis, NF-κB promotes hepatocellular death from ROI in these cells.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Gastrointestinal and Liver Physiology
Volume278
Issue number5 41-5
StatePublished - May 2000

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Caspases
Superoxides
Hydrogen Peroxide
Hepatocytes
Apoptosis
Oxygen
Vitamin K 3
Cell Death
Hepatocyte Nuclear Factors
DNA Cleavage
Poly(ADP-ribose) Polymerases
DNA Fragmentation
Fluorescence Microscopy
Tumor Necrosis Factor-alpha
Cell Line
Liver
Wounds and Injuries

Keywords

  • Liver
  • Menadione
  • Reactive oxygen intermediates

ASJC Scopus subject areas

  • Gastroenterology
  • Physiology
  • Physiology (medical)

Cite this

Jones, B. E., Lo, C. R., Liu, H., Pradhan, Z., Garcia, L., Srinivasan, A., ... Czaja, M. J. (2000). Role of caspases and NF-κB signaling in hydrogen peroxide- and superoxide-induced hepatocyte apoptosis. American Journal of Physiology - Gastrointestinal and Liver Physiology, 278(5 41-5).

Role of caspases and NF-κB signaling in hydrogen peroxide- and superoxide-induced hepatocyte apoptosis. / Jones, Brett E.; Lo, Chau R.; Liu, Hailing; Pradhan, Zehra; Garcia, Lydia; Srinivasan, Anu; Valentino, Karen L.; Czaja, Mark J.

In: American Journal of Physiology - Gastrointestinal and Liver Physiology, Vol. 278, No. 5 41-5, 05.2000.

Research output: Contribution to journalArticle

Jones, BE, Lo, CR, Liu, H, Pradhan, Z, Garcia, L, Srinivasan, A, Valentino, KL & Czaja, MJ 2000, 'Role of caspases and NF-κB signaling in hydrogen peroxide- and superoxide-induced hepatocyte apoptosis', American Journal of Physiology - Gastrointestinal and Liver Physiology, vol. 278, no. 5 41-5.
Jones, Brett E. ; Lo, Chau R. ; Liu, Hailing ; Pradhan, Zehra ; Garcia, Lydia ; Srinivasan, Anu ; Valentino, Karen L. ; Czaja, Mark J. / Role of caspases and NF-κB signaling in hydrogen peroxide- and superoxide-induced hepatocyte apoptosis. In: American Journal of Physiology - Gastrointestinal and Liver Physiology. 2000 ; Vol. 278, No. 5 41-5.
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