Active, phosphorylation-dependent MAP kinases, MAPK/ERK, SAPK/JNK and p38, and specific transcription factor substrates are differentially expressed following systemic administration of kainic acid to the adult rat

Acta Neuropathologica
Isidre FerrerF Viñals

Abstract

Excitotoxicity is considered a major cell death inductor in neurodegeneration. Yet the mechanisms involved in cell death and cell survival following excitotoxic insults are poorly understood. Expression of active, phosphorylation-dependent mitogen-activated extracellular signal-regulated kinases (MAPK/ERKs), stress-activated c-Jun N-terminal kinases (SAPK/JNKs) and p38 kinases, as well as their putative active, phosphorylation-dependent specific transcriptional factor substrates CREB, Elk-1, ATF-2, c-Myc and c-Jun, has been examined following systemic administration of kainic acid (KA) at convulsant doses to rats. Increased phosphorylated MAPK (MAPK(P)) immunoreactivity has been found at 3 and 6 h in the vulnerable regions entorhinal cortex and CA3, in which neurons are committed to die, as well as in sensitive regions dentate gyrus and gyrus cinguli, in which neurons will survive. JNK(P) has been observed in the entorhinal cortex and dentate gyrus, and p38(P) immunoreactivity occurs in the entorhinal cortex. Strong c-Myc(P) expression parallels MAPK(P) immunoreactivity in the entorhinal cortex, CA3, dentate gyrus and gyrus cinguli, showing that enhanced c-Myc(P) expression does not preclude cell death or cell survival. Selecti...Continue Reading

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