Role of nuclear factor-κB activation in bilirubin-induced rat hippocampal neuronal apoptosis and the effect of TAT-NBD intervention / 南方医科大学学报
Journal of Southern Medical University
;
(12): 172-176, 2013.
Article
in Chinese
| WPRIM
| ID: wpr-322087
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the role of nuclear factor-κB (NF-κB) activation in bilirubin-induced apoptosis of rat hippocampal neurons and the effect of TAT-NBD intervention on bilirubin neurotoxicity.</p><p><b>METHODS</b>Primary-cultured rat hippocampal neurons were treated with TAT-NBD in the initial 6 or 24 h or in the latter 6 h during a 24-h bilirubin exposure of the cells (early, continuous and late intervention groups, respectively). Immunocytochemistry was performed to detect NF-κB p65 protein expression, and the cell survival and apoptosis were assessed with a modified MTT assay, Annexin V-FITC/PI and TUNEL assay. IL-1β concentration in the supernatant was determined with ELISA.</p><p><b>RESULTS</b>Compared with the control cells, bilirubin-treated cells showed a significantly increased NF-κB p65 protein expression (P<0.01), which reached the peak level at 6 and 24 h (P<0.01). The cell survival rate in early TAT-NBD intervention group was (80.784∓9.767)%, significantly lower than that of the control group (P<0.01) but higher than that of bilirubin group (P<0.01); the apoptotic rate in early TAT-NBD intervention group was significantly higher than that of control group (P<0.01) but lower than that of bilirubin group (P<0.01). IL-1β concentration was significantly lower in early TAT-NBD intervention group (15.348∓0.812 pg/ml) than in bilirubin group (P<0.05). The continuous and late TAT-NBD intervention groups showed comparable cell survival rate, apoptotic rate and IL-1β concentration with bilirubin group (P>0.05).</p><p><b>CONCLUSION</b>NF-κB bidirectionally regulates bilirubin-induced apoptosis of rat hippocampal neurons. Selective inhibition of the early peak of NF-κB by TAT-NBD offers neuroprotective effect. TAT-NBD can be potentially used for prophylaxis of bilirubin-induced brain injury.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Peptides
/
Pharmacology
/
Bilirubin
/
Cell Survival
/
Cells, Cultured
/
Rats, Sprague-Dawley
/
Apoptosis
/
Neuroprotective Agents
/
Cell Biology
/
Transcription Factor RelA
Limits:
Animals
Language:
Chinese
Journal:
Journal of Southern Medical University
Year:
2013
Type:
Article
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