Beta-Bungarotoxin induction of neurite outgrowth in NB41A3 cells.
In this study, different concentrations of beta-Bgt were used to treat cultured NB41A3 cells. Inverted phase contrast microscopy was then used 24h after treatment to observe the outgrowth of neurite. We found a clear outgrowth of neurite at beta-Bgt concentrations of 357 nM. However, using a cytotoxicity assay to study apoptosis, we found no significant difference in the rate of cell death in cell cultures treated with either 357 nM or 714 nM. Western blotting showed that after treatment with beta-Bgt, there was a notable decrease in small G protein Cdc42 and a marked increase in RhoA protein. Flow cytometry revealed that beta-Bgt did not alter the calcium influx in NB41A3 cells. The neurite outgrowth induced by beta-Bgt was not affected by extracellular EGTA, suggesting that the internalization of beta-Bgt from extracellular was independent of phospholipase. Taken together, our results suggest the beta-Bgt-induced outgrowth of neurite from NB41A3 cells may be mediated by small G proteins.
Wu
Pei-Fung
PF
Department of Kinesiology, Health and Leisure Studies, National Kaohsiung University, Kaohsiung, Taiwan. anniepf@nuk.edu.tw
Chang
Long-Sen
LS
Kao
Yu-Ling
YL
Wang
Kuang-Tao
KT
D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D002038:Bungarotoxins / Q000633:toxicity*; D002118:Calcium / Q000378:metabolism; D020013:Calcium Signaling / Q000187:drug effects; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004533:Egtazic Acid / Q000494:pharmacology; D051379:Mice; D020559:Monomeric GTP-Binding Proteins / Q000378:metabolism; D016501:Neurites / Q000187:drug effects* / Q000473:pathology / Q000502:physiology*; D009447:Neuroblastoma / Q000188:drug therapy* / Q000473:pathology / Q000503:physiopathology; D020764:cdc42 GTP-Binding Protein / Q000378:metabolism; D020741:rho GTP-Binding Proteins / Q000378:metabolism; D020742:rhoA GTP-Binding Protein
D002038:Bungarotoxins; D004533:Egtazic Acid; D020559:Monomeric GTP-Binding Proteins; C526380:RhoA protein, mouse; D020764:cdc42 GTP-Binding Protein; D020741:rho GTP-Binding Proteins; D020742:rhoA GTP-Binding Protein; D002118:Calcium