Kainate Receptor Activation Induces Mixed Lineage Kinase-mediated Cellular Signaling Cascades via Post-synaptic Density Protein 95*

Kainate receptor glutamate receptor 6 (GluR6) subunit-deficient and c-Jun N-terminal kinase 3 (JNK3)-null mice share similar phenotypes including resistance to kainite-induced epileptic seizures and neuronal toxicity (Yang, D. D., Kuan, C-Y., Whitmarsh, A. J., Rincon, M., Zheng, T. S., Davis, R. J., Rakis, P., and Flavell, R. (1997) Nature 389, 865–869; Mulle, C., Seiler, A., Perez-Otano, I., Dickinson-Anson, H., Castillo, P. E., Bureau, I., Maron, C., Gage, F. H., Mann, J. R., Bettler, B., and Heinemmann, S. F. (1998) Nature 392, 601–605). This suggests that JNK activation may be involved in GluR6-mediated excitotoxicity. We provide evidence that post-synaptic density protein (PSD-95) links GluR6 to JNK activation by anchoring mixed lineage kinase (MLK) 2 or MLK3, upstream activators of JNKs, to the receptor complex. Association of MLK2 and MLK3 with PSD-95 in HN33 cells and rat brain preparations is dependent upon the SH3 domain of PSD-95, and expression of GluR6 in HN33 cells activated JNKs and induced neuronal apoptosis. Deletion of the PSD-95-binding site of GluR6 reduced both JNK activation and neuronal toxicity. Co-expression of dominant negative MLK2, MLK3, or mitogen-activated kinase kinase (MKK) 4 and MKK7 also significantly attenuated JNK activation and neuronal toxicity mediated by GluR6, and co-expression of PSD-95 with a deficient Src homology 3 domain also inhibited GluR6-induced JNK activation and neuronal toxicity. Our results suggest that PSD-95 plays a critical role in GluR6-mediated JNK activation and excitotoxicity by anchoring MLK to the receptor complex.

• Publication year

  2001

• Venue

  Journal of Biological Chemistry

• Publication date

  2001-04-06

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/JBC.M100190200PMID 11152698
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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