TY - JOUR
T1 - Oxidative stress activates transcription factor Nf-κB-mediated protective signaling in primary rat neuronal cultures
AU - Kratsovnik, Ella
AU - Bromberg, Yael
AU - Sperling, Oded
AU - Zoref-Shani, Esther
N1 - Funding Information:
This study was supported in part by the Dr. Boris (Dov) Quartin Chair in Chemical Pathology (O. S.) and by the Hirsh and Gania Wasserman Fund, Sackler Faculty of Medicine. This work partially fulfills the requirements of the M.Sc. thesis of E. K., at the Sackler Faculty of Medicine, Tel Aviv University.
PY - 2005/5
Y1 - 2005/5
N2 - Activation of transcription factor nuclear factor-κB (NF-κB) can result in enhanced de novo synthesis of both proteins that confer protection and those that cause death. The present study was undertaken to clarify in primary neuronal cultures the consequences of the oxidative stress-induced activation of NF-κB and mediation of death or survival signals. The neuronal cultures were exposed to chemical ischemia (iodoacetic acid), followed by reperfusion (I/R insult). This insult injured the neurons, as manifested in a 7- to 10-fold increase in LDH release, and decreased the cellular content of IκBα by 55-65 %, indicating NF-κB activation. The antioxidants LY231617, melatonin, and sodium salicylate and the antioxidant and inhibitor of NF-κB activation pyrrolidine dithiocarbamate, protected the neurons against the insult and prevented the decrease in cellular IκBα content. In contrast, inhibition of NF-κB translocation by SN50 inbothuninsulted and insulted neuronal cultures resulted in a 2.9- and 2.4-fold increase in LDH release, respectively. The results indicate that the insult-induced oxidative stress activates transcription factor NF-κB associated with induction of protection and suggest that constitutive activation of NF-κB under physiological conditions acts to protect the neurons against physiological injury.
AB - Activation of transcription factor nuclear factor-κB (NF-κB) can result in enhanced de novo synthesis of both proteins that confer protection and those that cause death. The present study was undertaken to clarify in primary neuronal cultures the consequences of the oxidative stress-induced activation of NF-κB and mediation of death or survival signals. The neuronal cultures were exposed to chemical ischemia (iodoacetic acid), followed by reperfusion (I/R insult). This insult injured the neurons, as manifested in a 7- to 10-fold increase in LDH release, and decreased the cellular content of IκBα by 55-65 %, indicating NF-κB activation. The antioxidants LY231617, melatonin, and sodium salicylate and the antioxidant and inhibitor of NF-κB activation pyrrolidine dithiocarbamate, protected the neurons against the insult and prevented the decrease in cellular IκBα content. In contrast, inhibition of NF-κB translocation by SN50 inbothuninsulted and insulted neuronal cultures resulted in a 2.9- and 2.4-fold increase in LDH release, respectively. The results indicate that the insult-induced oxidative stress activates transcription factor NF-κB associated with induction of protection and suggest that constitutive activation of NF-κB under physiological conditions acts to protect the neurons against physiological injury.
KW - Antioxidants
KW - IκBα
KW - Pyrrolidine dithiocarbamate (PDTC)
KW - Reactive oxygen species (ROS)
KW - SN50
KW - Transcription factor nuclear factor-κB (NF-κB)
UR - http://www.scopus.com/inward/record.url?scp=22344447847&partnerID=8YFLogxK
U2 - 10.1385/JMN:26:03:27
DO - 10.1385/JMN:26:03:27
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AN - SCOPUS:22344447847
SN - 0895-8696
VL - 26
SP - 27
EP - 32
JO - Journal of Molecular Neuroscience
JF - Journal of Molecular Neuroscience
IS - 1
ER -