[Sensitization of human glioma SWO cell line to tumor necrosis factor-induced apoptosis by blocking phospholipase C-gamma1 signaling pathway].
OBJECTIVE
To explore the role of phospholipase C-gamma1 (PLC-gamma1) in tumor necrosis factor-alpha (TNF-alpha)-induced apoptosis of human glioma SWO cells.


METHODS
The PLC-gamma1 pathway was blocked by U73122 in SWO cells, and the inhibitory effect of TNF-alpha on SWO glioma cell proliferation with or without U73122 treatment was investigated by MTT assay. The cell apoptosis induced by TNF-alpha along or in combination with U73122 was detected by flow cytometry with PI staining. The expression of caspase-3 and Bcl-2 was detected by Western blotting.


CONCLUSIONS
U73122 can sensitize SWO glioma cells to TNF-alpha-induced apoptosis. Blocking the PLC-gamma1 pathway may not induce apoptosis of SWO glioma cells, but can sensitize SWO glioma cells to small-dose TNF-alpha-induced apoptosis, the mechanism of which may involve down-regulation of bcl-2.
Department of Cell Biology, Southern Medical University, Guangzhou 510515, China.
Jun
J
Lin
Jin-Cheng
JC
Yang
Li
L
Tan
Shen-Qiu
SQ
Luo
D017209:Apoptosis / Q000187:drug effects*; D015153:Blotting, Western; D053148:Caspase 3 / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D015536:Down-Regulation / Q000187:drug effects; D004963:Estrenes / Q000494:pharmacology*; D005434:Flow Cytometry; D005910:Glioma / Q000201:enzymology / Q000473:pathology; D006801:Humans; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology; D051966:Phospholipase C gamma / Q000037:antagonists & inhibitors* / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D011760:Pyrrolidinones / Q000494:pharmacology*; D015398:Signal Transduction / Q000187:drug effects; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
D004963:Estrenes; D010726:Phosphodiesterase Inhibitors; D019253:Proto-Oncogene Proteins c-bcl-2; D011760:Pyrrolidinones; D014409:Tumor Necrosis Factor-alpha; C060229:1-(6-((3-methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl)-1H-pyrrole-2,5-dione; D051966:Phospholipase C gamma; D053148:Caspase 3