Synergistic neuroprotection by bis(7)-tacrine via concurrent blockade of N-methyl-D-aspartate receptors and neuronal nitric-oxide synthase

Wenming Li, Jian Xue, Chunying Niu, Hongjun Fu, Colin S C Lam, Jialie Luo, Hugh H N Chan, Huaiguo Xue, Kelvin K W Kan, Nelson T K Lee, Chaoying Li, Yuan-Ping Pang, Mingtao Li, Karl W K Tsim, Hualiang Jiang, Kaixian Chen, Xiaoyuan Li, Yifan Han

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Abstract

The excessive activation of the N-methyl-D-aspartate receptor (NMDAR)/nitric oxide (NO) pathway has been proposed to be involved in the neuropathology of various neurodegenerative disorders. In this study, NO was found to mediate glutamate-induced excitotoxicity in primary cultured neurons. Compared with the NO synthase (NOS) inhibitor, NG-monomethyl-L- arginine (L-NMMA), and the NMDAR antagonist memantine, bis(7)-tacrine was found to be more potent in reducing NO-mediated excitotoxicity and the release of NO caused by glutamate. Moreover, like L-NMMA but not like 5H-dibenzo[a,d] cyclohepten-5,10-imine (MK-801) and memantine, bis(7)-tacrine showed greater neuroprotection and inhibition on NO release when neurons were pretreated for a prolonged time between 0 and 24 h and remained quite potent even when neurons were post-treated 1 h after the glutamate challenge. Bis(7)-tacrine was additionally found to be as moderately potent as memantine in competing with [3H]MK-801, inhibiting NMDA-evoked currents and reducing glutamate-triggered calcium influx, which eventually reduced neuronal NOS activity. More importantly, at neuroprotective concentrations, bis(7)-tacrine substantially reversed the overactivation of neuronal NOS caused by glutamate without interfering with the basal activity of NOS. Furthermore, in vitro pattern analysis demonstrated that bis(7)-tacrine competitively inhibited both purified neuronal and inducible NOS with IC50 values at 2.9 and 9.3 μM but not endothelial NOS. This result was further supported by molecular docking simulations that showed hydrophobic interactions between bis(7)-tacrine and three NOS isozymes. Taken together, these results strongly suggest that the substantial neuroprotection against glutamate by bis(7)-tacrine might be mediated synergistically through the moderate blockade of NMDAR and selective inhibition of neuronal NOS.

Original languageEnglish (US)
Pages (from-to)1258-1267
Number of pages10
JournalMolecular Pharmacology
Volume71
Issue number5
DOIs
StatePublished - May 2007

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Nitric Oxide Synthase Type I
N-Methyl-D-Aspartate Receptors
Nitric Oxide Synthase
Glutamic Acid
Nitric Oxide
Memantine
omega-N-Methylarginine
Dizocilpine Maleate
Neurons
Molecular Docking Simulation
Imines
1,7-N-heptylene-bis-9,9'-amino-1,2,3,4-tetrahydroacridine
Neuroprotection
N-Methylaspartate
Hydrophobic and Hydrophilic Interactions
Neurodegenerative Diseases
Isoenzymes
Inhibitory Concentration 50
Calcium

ASJC Scopus subject areas

  • Pharmacology

Cite this

Synergistic neuroprotection by bis(7)-tacrine via concurrent blockade of N-methyl-D-aspartate receptors and neuronal nitric-oxide synthase. / Li, Wenming; Xue, Jian; Niu, Chunying; Fu, Hongjun; Lam, Colin S C; Luo, Jialie; Chan, Hugh H N; Xue, Huaiguo; Kan, Kelvin K W; Lee, Nelson T K; Li, Chaoying; Pang, Yuan-Ping; Li, Mingtao; Tsim, Karl W K; Jiang, Hualiang; Chen, Kaixian; Li, Xiaoyuan; Han, Yifan.

In: Molecular Pharmacology, Vol. 71, No. 5, 05.2007, p. 1258-1267.

Research output: Contribution to journalArticle

Li, W, Xue, J, Niu, C, Fu, H, Lam, CSC, Luo, J, Chan, HHN, Xue, H, Kan, KKW, Lee, NTK, Li, C, Pang, Y-P, Li, M, Tsim, KWK, Jiang, H, Chen, K, Li, X & Han, Y 2007, 'Synergistic neuroprotection by bis(7)-tacrine via concurrent blockade of N-methyl-D-aspartate receptors and neuronal nitric-oxide synthase', Molecular Pharmacology, vol. 71, no. 5, pp. 1258-1267. https://doi.org/10.1124/mol.106.029108
Li, Wenming ; Xue, Jian ; Niu, Chunying ; Fu, Hongjun ; Lam, Colin S C ; Luo, Jialie ; Chan, Hugh H N ; Xue, Huaiguo ; Kan, Kelvin K W ; Lee, Nelson T K ; Li, Chaoying ; Pang, Yuan-Ping ; Li, Mingtao ; Tsim, Karl W K ; Jiang, Hualiang ; Chen, Kaixian ; Li, Xiaoyuan ; Han, Yifan. / Synergistic neuroprotection by bis(7)-tacrine via concurrent blockade of N-methyl-D-aspartate receptors and neuronal nitric-oxide synthase. In: Molecular Pharmacology. 2007 ; Vol. 71, No. 5. pp. 1258-1267.
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AU - Fu, Hongjun

AU - Lam, Colin S C

AU - Luo, Jialie

AU - Chan, Hugh H N

AU - Xue, Huaiguo

AU - Kan, Kelvin K W

AU - Lee, Nelson T K

AU - Li, Chaoying

AU - Pang, Yuan-Ping

AU - Li, Mingtao

AU - Tsim, Karl W K

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