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Nardosinone, the first enhancer of neurite outgrowth-promoting activity of staurosporine and dibutyryl cyclic AMP in PC12D cells



Nardosinone, the first enhancer of neurite outgrowth-promoting activity of staurosporine and dibutyryl cyclic AMP in PC12D cells



Brain Research. Developmental Brain Research 145(2): 177-183



Nardosinone was isolated as an enhancer of nerve growth factor (NGF) from Nardostachys chinensis [Neurosci. Lett. 273 (1999) 53]. Nardosinone (0.1-100 microM) enhanced dibutyryl cyclic AMP (dbcAMP, 0.3 mM)- and staurosporine (10 nM)-induced neurite outgrowth from PC12D cells in a concentration-dependent manner. PD98059 (20 microM), a potent mitogen-activated protein (MAP) kinase kinase inhibitor, partially blocked enhancements of dbcAMP (0.3 mM)- or staurosporine (10 nM)-induced neurite outgrowth by nardosinone. Nardosinone alone had no effect on the phosphorylation of MAP kinase. The dbcAMP-induced increase in phosphorylation of MAP kinase was not affected by nardosinone. Staurosporine almost unaffected the phosphorylation of MAP kinase, and nardosinone potentiated the staurosporine-induced neurite outgrowth without stimulation of the phosphorylation of MAP kinase. Since it is known that MAP kinase signaling is required for neurite outgrowth in PC12D cells, these results suggest that nardosinone enhances staurosporine- or dbcAMP-induced neurite outgrowth from PC12D cells, probably by amplifying both the MAP kinase-dependent and -independent signaling pathways of dbcAMP and staurosporine. It is also suggested that nardosinone enhances a downstream step of MAP kinase in the MAP kinase-dependent signaling pathway. Nardosinone is the first enhancer of the neuritogenic action of dbcAMP and staurosporine and may become a useful pharmacological tool for studying the mechanism of action of not only NGF but also both the neuritogenic substances.

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Accession: 012342062

Download citation: RISBibTeXText

PMID: 14604758

DOI: 10.1016/s0165-3806(03)00239-6


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