NMDA receptors mediate heat shock protein induction in the mouse brain following administration of the ibotenic acid analogue AMAA.

A M Planas, I Ferrer, E Rodríguez-Farré

Departament de Farmacologia i Toxicologia, CID, CSIC, Jordi Girona, Barcelona, Spain.

Brain research 1995 Nov 27

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Expression of inducible heat shock protein-70 (HSP-70) and hsp-70 mRNA were studied in the adult mouse brain following systemic administration of the ibotenic acid analogue (+/-)-2-amino-3-hydroxy-5-methyl-4-isoxazoleacetic acid (AMAA), which is a potent N-methyl-D-aspartate (NMDA) agonist. At the dose of 20 mg/kg, AMAA produced excitatory behaviours in adult mice but overt convulsions were not seen. This treatment did not result in any detectable morphological brain damage at 4 days following administration. At 2.5 h and 5 h following treatment induction of hsp-70 mRNA expression was found in the pyramidal cell layers of CA1 and, to a lesser extent, CA3 fields of hippocampal Ammon's horn, amygdala, olfactory lobes, tenia tecta, hypothalamic nuclei and a superficial layer of cingulate, frontal and retrosplenial cortices. The presence of HSP-70 was detected by immunochemistry at 24 h following drug administration in those regions previously showing hsp-70 mRNA induction. AMAA-induced hsp-70 mRNA expression was prevented by pre-treatment with the non-competitive NMDA antagonist MK-801. These results suggest that NMDA receptors are involved in the stress response induced by AMAA.

Citation

A M Planas, I Ferrer, E Rodríguez-Farré. NMDA receptors mediate heat shock protein induction in the mouse brain following administration of the ibotenic acid analogue AMAA. Brain research. 1995 Nov 27;700(1-2):289-94