RESUMO
In neuronal cultures, glycogen synthase kinase 3(GSK3) is truncated at the N-terminal end by calpain downstream of activated glutamate receptors. However, the in vivo biological significance of that truncation has not been explored. In an attempt to elucidate if GSK3 truncation has a pathophysiological relevance, we have used intraperitoneal injections of kainic acid (KA) in rats and intra-amygdala KA microinjections in mice as in vivo models of excitotoxicity. Spectrin cleavage analyzed by immunohistochemistry was observed in the CA1 hippocampal field in KA-intraperitoneal treated rats while the CA3 region was the hippocampal area affected after intra-amygdala KA microinjections. GSK3ß immunofluorescence did not colocalize with truncated spectrin in both treatments using an antibody that recognize the N-terminal end of GSK3ß. Thus, those neurons which are spectrin-positive do not show GSK3ß immunolabelling. To study GSK3ß truncation in vitro, we exposed organotypic hippocampal slices and cultured cortical neurons to KA leading to the truncation of GSK3 and we found that truncation was blocked by the calpain inhibitor calpeptin. These data suggest a relationship between N-terminal GSK3ß truncation and excitotoxicity. Overall, our data reinforces the important relationship between glutamate receptors and GSK3 and their role in neurodegenerative processes in which excitotoxicity is involved.
