A novel role of hippocalcin in bFGF-induced neurite outgrowth of H19-7 cells.
Hippocalcin is a Ca2+-binding protein that is expressed mainly in pyramidal nerve cells of the hippocampus. However, its functions and mechanism in the brain remain unclear. To elucidate the role of hippocalcin, we used a conditionally immortalized hippocampal cell line (H19-7) and showed that bFGF treatment increased the expression of hippocalcin during bFGF-induced neurite outgrowth of H19-7 cells. Overexpression of hippocalcin dramatically elongated neurites and increased the expression of basic helix-loop-helix transcription factor, that is, NeuroD without bFGF stimulation. Treatment of the cells with hippocalcin siRNA completely blocked bFGF-induced neurite outgrowth and NeuroD expression. bFGF stimulation resulted in activation of phospholipase C-gamma (PLC-gamma) and an increased level of intracellular Ca2+. Hippocalcin expression by bFGF stimulation was fully blocked by both the PLC-gamma inhibitor U73122 and BAPTA-AM, a chelator of intracellular Ca2+, suggesting that hippocalcin expression by bFGF is dependent on PLC-gamma and Ca2+. Moreover, both U73122 and BAPTA-AM completely blocked bFGF-induced neurite outgrowth and NeuroD expression. Taken together, these results suggest for the first time that bFGF induces hippocalcin expression in H19-7 cells through PLC-gamma activation, which leads to neurite outgrowth.
Oh
Doo-Yi
DY
Institute of Biomedical Science and Department of Biochemistry and Molecular Biology, College of Medicine, Hanyang University, Seoul, Korea.
Cho
Ju Hwan
JH
Park
Shin-Young
SY
Kim
Yong Seok
YS
Yoon
Young-Ju
YJ
Yoon
Shin Hee
SH
Chung
Kwang Chul
KC
Lee
Ki Sung
KS
Han
Joong-Soo
JS
D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism; D002118:Calcium / Q000378:metabolism; D002461:Cell Line, Transformed; D002614:Chelating Agents / Q000494:pharmacology; D004533:Egtazic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004963:Estrenes / Q000494:pharmacology; D016222:Fibroblast Growth Factor 2 / Q000378:metabolism / Q000494:pharmacology*; D005786:Gene Expression Regulation / Q000187:drug effects / Q000502:physiology*; D051597:Hippocalcin / Q000494:pharmacology*; D006624:Hippocampus / Q000166:cytology; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism; D016501:Neurites / Q000187:drug effects* / Q000502:physiology; D009474:Neurons / Q000166:cytology* / Q000187:drug effects; D051966:Phospholipase C gamma / Q000378:metabolism; D011760:Pyrrolidinones / Q000494:pharmacology; D034741:RNA, Small Interfering / Q000378:metabolism / Q000494:pharmacology; D051381:Rats; D014162:Transfection / Q000379:methods
D051792:Basic Helix-Loop-Helix Proteins; D002118:Calcium; D002614:Chelating Agents; D004533:Egtazic Acid; D004791:Enzyme Inhibitors; D004963:Estrenes; D016222:Fibroblast Growth Factor 2; D051597:Hippocalcin; D009419:Nerve Tissue Proteins; D051966:Phospholipase C gamma; D011760:Pyrrolidinones; D034741:RNA, Small Interfering; C060229:1-(6-((3-methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl)-1H-pyrrole-2,5-dione; C070379:1,2-bis(2-aminophenoxy)ethane N,N,N',N'-tetraacetic acid acetoxymethyl ester; C093564:Neurogenic differentiation factor 1