Abstract
In the Lurcher mutant mouse (+/Lc), Purkinje cells (PCs) selectively die due to the mutation that converts alanine to threonine in the glutamate ionotropic receptor GRID 2, thus resulting in a constitutively leaky cation channel. This intrinsic cell death determines a target-dependent cell death of granule cells and olivary neurons and cerebellum cytoarchitecture is severely disrupted in the adult Lurcher mutant. Although the +/Lc mutant has been widely characterized, less is known about the molecules involved in +/Lc PC death. We, here, used organotypic cerebellar slice cultures from P0 mice to investigate the role of c-jun N-terminal kinase (JNK) in +/Lc PC death by using D-JNKI1 as very specific tool to inhibit its action. Our results showed that D-JNKI1 treatment increased the number of +/Lc PC at 14 DIV of 3.6-fold. Conversely, this specific JNK inhibitor cell permeable peptide did not increase PC number in +/+ treated versus untreated cultures. These results clearly indicate that JNK plays an important role in +/Lc PC mechanism of cell death.
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Acknowledgments
Dr. Repici was supported by an FRM grant. D-JNKI1 peptide was kindly provided by Xigen, SA, Rue des Terreaux 17, CH-1003 Lausanne, Switzerland. We thank Dr. Rudolf Kraftsik for statistical analysis.
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Repici, M., Zanjani, H.S., Gautheron, V. et al. Specific JNK Inhibition by D-JNKI1 Protects Purkinje Cells from Cell Death in Lurcher Mutant Mouse. Cerebellum 7, 534–538 (2008). https://doi.org/10.1007/s12311-008-0070-8
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DOI: https://doi.org/10.1007/s12311-008-0070-8