Int. J. Mol. Sci. 2012, 13(7), 9097-9109; doi:10.3390/ijms13079097
Article

Curcumin Inhibits Glutamate Release from Rat Prefrontal Nerve Endings by Affecting Vesicle Mobilization

1 Department of Anesthesiology, Far-Eastern Memorial Hospital, Pan-Chiao District, New Taipei City 22060, Taiwan 2 Department of Mechanical Engineering, Yuan Ze University, Taoyuan 320, Taiwan 3 Graduate Institute of Basic Medicine, Jen Catholic University, No.510, Zhongzheng Rd., Xinzhuang District, New Taipei City 24205, Taiwan 4 School of Medicine, Fu Jen Catholic University, No.510, Zhongzheng Rd., Xinzhuang District, New Taipei City 24205, Taiwan
* Author to whom correspondence should be addressed.
Received: 20 June 2012; in revised form: 11 July 2012 / Accepted: 16 July 2012 / Published: 20 July 2012
(This article belongs to the Special Issue Plant-Derived Pharmaceuticals by Molecular Farming 2012)
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Abstract: Curcumin, one of the major constituents of Curcuma longa, has been shown to inhibit depolarization-evoked glutamate release from rat prefrontocortical nerve terminals by reducing voltage-dependent Ca2+ entry. This study showed that curcumin inhibited ionomycin-induced glutamate release and KCl-evoked FM1-43 release, suggesting that some steps after Ca2+ entry are regulated by curcumin. Furthermore, disrupting the cytoskeleton organization using cytochalasin D abolished the inhibitory action of curcumin on ionomycin-induced glutamate release. Mitogen-activated protein kinase kinase (MEK) inhibition also prevented the inhibitory effect of curcumin on ionomycin-induced glutamate release. Western blot analyses showed that curcumin decreased the ionomycin-induced phosphorylation of extracellular signal-regulated kinase 1 and 2 (ERK1/2) and synaptic vesicle-associated protein synapsin I, the main presynaptic target of ERK. These results show that curcumin-mediated inhibition of glutamate release involves modulating downstream events by controlling synaptic vesicle recruitment and exocytosis, possibly through a decrease of MAPK/ERK activation and synapsin I phosphorylation, thereby decreasing synaptic vesicle availability for exocytosis.
Keywords: curcumin; glutamate exocytotic machinery; ERK; synapsin I; prefrontocortical nerve terminals

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MDPI and ACS Style

Lin, T.Y.; Lu, C.W.; Huang, S.K.; Wang, S.J. Curcumin Inhibits Glutamate Release from Rat Prefrontal Nerve Endings by Affecting Vesicle Mobilization. Int. J. Mol. Sci. 2012, 13, 9097-9109.

AMA Style

Lin TY, Lu CW, Huang SK, Wang SJ. Curcumin Inhibits Glutamate Release from Rat Prefrontal Nerve Endings by Affecting Vesicle Mobilization. International Journal of Molecular Sciences. 2012; 13(7):9097-9109.

Chicago/Turabian Style

Lin, Tzu Yu; Lu, Cheng Wei; Huang, Shu Kuei; Wang, Su Jane. 2012. "Curcumin Inhibits Glutamate Release from Rat Prefrontal Nerve Endings by Affecting Vesicle Mobilization." Int. J. Mol. Sci. 13, no. 7: 9097-9109.

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