SUN11602, a Novel Aniline Compound, Mimics the Neuroprotective Mechanisms of Basic Fibroblast Growth Factor
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- 作者：Norihito Murayama ; Taisuke Kadoshima ; Naohiro Takemoto ; Shiho Kodama ; Tetsuya Toba ; Ryoko Ogino ; Takafumi Noshita ; Tetsushi Oka ; Shinya Ueno ; Mariko Kuroda ; Yoshiari Shimmyo ; Yasuhiro Morita ; Teruyoshi Inoue
- 刊名：ACS Chemical Neuroscience
- 出版年：2013
- 出版时间：February 20, 2013
- 年：2013
- 卷：4
- 期：2
- 页码：266-276
- 全文大小：507K
- 年卷期：v.4,no.2(February 20, 2013)
- ISSN：1948-7193
文摘
Basic fibroblast growth factor (bFGF) offers some measure of protection against excitotoxic neuronal injuries by upregulating the expression of the calcium-binding protein calbindin-D28k (Calb). The newly synthesized small molecule 4-({4-[[(4-amino-2,3,5,6-tetramethylanilino)acetyl](methyl)amino]-1-piperidinyl}methyl)benzamide (SUN11602) mimics the neuroprotective effects of bFGF, and thus, we examined how SUN11602 exerts its actions on neurons in toxic conditions of glutamate. In primary cultures of rat cerebrocortical neurons, SUN11602 and bFGF prevented glutamate-induced neuronal death. This neuroprotection, which occurred in association with the augmented phosphorylation of the bFGF receptor-1 (FGFR-1) and the extracellular signal-regulated kinase-1/2 (ERK-1/2), was abolished by pretreatment with PD166866 (a FGFR-1 tyrosine kinase-specific inhibitor) and PD98059 (a mitogen-activated protein kinase [MAPK]/[ERK-1/2] kinase [MEK] inhibitor). In addition, SUN11602 and bFGF increased the levels of CALB1 gene expression in cerebrocortical neurons. Whether this neuroprotection was linked to Calb was investigated with primary cultures of cerebrocortical neurons from homozygous knockout (Calb鈥?鈥?/sup>) and wild-type (WT) mice. In WT mice, SUN11602 and bFGF increased the levels of newly synthesized Calb in cerebrocortical neurons and suppressed the glutamate-induced rise in intracellular Ca2+. This Ca2+-capturing ability of Calb allowed the neurons to survive severe toxic conditions of glutamate. In contrast, Calb levels remained unchanged in Calb鈥?鈥?/sup> mice after exposure to SUN11602 or bFGF, and due to a loss of function of the gene, these neurons were no longer resistant to toxic conditions of glutamate. These findings indicated that SUN11602 activated a number of cellular molecules (FGFR-1, MEK/ERK intermediates, and Calb) and consequently contributed to intracellular Ca2+ homeostasis as observed in the case of bFGF.