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Du, Y; Li, C; Hu, W.-W; Song, Y.-J; Zhang, G.-Y
Neuroscience, 06/2009, Letnik: 161, Številka: 2Journal Article
Abstract Our previous studies showed that the assembly of the GluR6–PSD95–mixed lineage kinase 3 (MLK3) signaling module played an important role in rat ischemic brain injury. In this study, we aimed to elucidate whether ischemic preconditioning could downregulate the assembly of the GluR6–PSD95–MLK3 signaling module and suppress the activation of MLK3, MKK4/7, and c-Jun N- terminal kinase (JNK). As a result, ischemic preconditioning could not only inhibit the assembly of the GluR6–PSD95–MLK3 signaling module, diminish the phosphorylation of the transcription factor c-Jun, downregulate Fas ligand expression, attenuate the phosphorylation of 14-3-3 and Bcl-2 and the translocation of Bax to mitochondria, but also increase the release of cytochrome c and the activation of caspase-3. In contrast, both GluR6 antisense ODNs (oligodeoxynucleotides) and 6,7,8,9-tetrahydro-5-nitro-1 H-benzgindole-2,3-dione-3-oxime (NS102), an antagonist of GluR6 receptor, prevented the above effects of preconditioning, which shows that suppressing the expression of GluR6 or inhibiting GluR6 activity contributes negatively to preconditioning-induced ischemia tolerance. Taken together, our results indicate that preconditioning can inhibit the over-assembly of the GluR6–PSD95–MLK3 signaling module and the JNK3 activation. GluR6 subunit-containing kainite receptors play an important role in the preconditioning-induced neuronal survival and provide new insight into stroke therapy.
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