Abstract
Nuclear factor-κB (NF-κB) is a transcriptional regulator of neuron survival eliciting diverse effects according to the specific composition of its active dimer. While p50/p65 mediates neurodegenerative events, c-Rel-containing dimers promote cell survival. Stimulation of metabotropic glutamate receptors type 5 (mGlu5) reduces neuron vulnerability to amyloid-β through activation of anti-apoptotic, c-Rel-dependent transcription of Bcl-XL pathway. We here evaluated the protective activity of mGlu5 agonists in dopaminergic SK-N-SH cells exposed to 1-methyl-4-phenylpyridinium (MPP+), the active metabolite of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) causing parkinsonism in experimental animals. MPP+ produced a concentration-dependent cell loss. Activation of mGlu5 receptors by CHPG (1 mM) and 3HPG (50 μM) abolished the toxic effect produced by 3 μM MPP+. The neuroprotection was associated with activation of NF-κB p65/c-Rel dimer and reduction of p50/p65. These effects were prevented by the mGlu5 receptor antagonist MPEP (5 μM). It is suggested that mGlu5 receptor agonists through activation of a c-Rel-dependent anti-apoptotic pathway can rescue dopaminergic cell from mitochondrial toxicity.
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Abbreviations
- MPP+ :
-
1-Methyl-4-phenylpyridinium ion
- CHPG:
-
(R,S)-2-Chloro-5-hydroxyphenylglycine
- 3HPG:
-
(S)-3-Hydroxy-phenyl-glycine
- mGlu receptor:
-
Metabotropic glutamate receptor
- MPEP:
-
2-Methyl-6-phenylethynyl-pyridine
- NF-κB:
-
Nuclear factor-κB
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Acknowledgments
This work was supported by grants from Italian Ministry of Education, University and Scientific Research-PRIN 2004, 2005 and 2006; Center of Study and Research on Ageing, Brescia; MIUR Center of Excellence for Innovative Diagnostics and Therapeutics (IDET) of Brescia University.
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Sarnico, I., Boroni, F., Benarese, M. et al. Activation of NF-κB p65/c-Rel dimer is associated with neuroprotection elicited by mGlu5 receptor agonists against MPP+ toxicity in SK-N-SH cells. J Neural Transm 115, 669–676 (2008). https://doi.org/10.1007/s00702-007-0007-2
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DOI: https://doi.org/10.1007/s00702-007-0007-2