Effect of scoparone on neurite outgrowth in PC12 cells.
The neurite outgrowth-promoting effects of scoparone isolated from the stem bark of Liriodendron tulipifera were investigated in PC12 cells. At a concentration of 200 microM, scoparone markedly induced neurite outgrowth from PC12 cells. Scoparone at 200 microM also enhanced the outgrowth of neurites from cells in the presence of nerve growth factor (NGF, 2 ng/ml). The levels of intracellular cyclic AMP and concentration of Ca2+ were also increased by 200 microM scoparone. In addition, scoparone at 200 microM increased the activities of extracellular signal-regulated protein kinase (ERK), cyclic AMP-dependent protein kinase (PKA), protein kinase C (PKC) and Ca2+/calmodulin kinase II (CaMK II). However, scoparone-induced neurite outgrowth was blocked by a mitogen-activated protein kinase inhibitor (U0126), a PKA inhibitor (H89), a PKC inhibitor (GF109203X) and a CaMK II inhibitor (KN62). These kinase inhibitors also reduced the scoparone-induced neurite outgrowth associated with NGF. These results suggest that scoparone can induce neurite outgrowth by stimulating the upstream steps of ERK, PKA, PKC and CaMK II in PC12 cells.
Yang
Yoo Jung
YJ
College of Pharmacy and Research Center for Bioresource and Health, Chungbuk National University, Cheongju 361-763, Republic of Korea.
Lee
Hak Ju
HJ
Choi
Don Ha
DH
Huang
Hai Shan
HS
Lim
Sung Cil
SC
Lee
Myung Koo
MK
D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology*; D002118:Calcium / Q000378:metabolism; D003374:Coumarins / Q000494:pharmacology*; D000242:Cyclic AMP / Q000378:metabolism; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D004791:Enzyme Inhibitors / Q000494:pharmacology; D020932:Nerve Growth Factor / Q000494:pharmacology; D016501:Neurites / Q000187:drug effects*; D016716:PC12 Cells / Q000166:cytology; D051381:Rats; D013997:Time Factors
D000959:Antihypertensive Agents; D003374:Coumarins; D004791:Enzyme Inhibitors; D020932:Nerve Growth Factor; D000242:Cyclic AMP; D017868:Cyclic AMP-Dependent Protein Kinases; C018145:scoparone; D002118:Calcium