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Oncogenic H-Ras, FK228, and exogenous H2O2 cooperatively activated the ERK pathway in selective induction of human urinary bladder cancer J82 cell death
Molecular Carcinogenesis (2011)
  • SHAMBHUNATH CHOUDHARY, University of Tennessee - Knoxville
  • K-KA Wang
  • H-CR Wang, University of Tennessee - Knoxville
Abstract

More than 35% of human urinary bladder cancers involve oncogenic H-Ras activation. The goal of this study was to investigate the role of the ERK pathway in mediating apoptotic signals induced by oncogenic H-Ras, FK228 treatment, and exogenous H(2) O(2) treatment to increase Nox-1 elevation, leading to production of intracellular reactive oxygen species (ROS) for inducing apoptosis in human bladder cancer J82 cells. Our study revealed that FK228 combined with exogenous H(2)O(2) cooperatively induced activation of Mek1/2 and Erk1/2 to increase Nox-1 elevation, intracellular ROS production, caspase activation, and cell death. Expression of oncogenic H-Ras significantly increased these FK228- and exogenous H(2)O(2)-induced effects. Oncogenic H-Ras-increased cell susceptibility to FK228 could be alternately achieved by additional treatment with exogenous H(2)O(2). Hence, combined use of FK228 with ROS-generating agents may apply to therapeutic strategies to preferentially kill malignant cells with or without oncogenic H-Ras activation.

Publication Date
March, 2011
Citation Information
SHAMBHUNATH CHOUDHARY, K-KA Wang and H-CR Wang. "Oncogenic H-Ras, FK228, and exogenous H2O2 cooperatively activated the ERK pathway in selective induction of human urinary bladder cancer J82 cell death" Molecular Carcinogenesis Vol. 50 Iss. 3 (2011)
Available at: http://works.bepress.com/shambhunath_choudhary/9/