Rapid dephosphorylation of microtubule-associated protein 2 in the rat brain hippocampus after pentylenetetrazole-induced seizures.
We have studied the effect of Pentylenetetrazole (PTZ)-induced seizures on the state of phosphorylation of microtubule-associated protein 2 (MAP-2) from rat hippocampus. A method for the in vivo 32P-labeling of hippocampal proteins has been established, consisting of intracerebro-ventricular injection of 32PO4 of high specific activity. The results obtained indicate that PTZ induces a rapid and transient dephosphorylation of high-molecular-mass MAP-2, which is prevented when the N-methyl-D-aspartate receptor antagonist MK-801 is previously administered. Phosphopeptide mapping of 32P-labeled MAP-2 obtained from hippocampi of PTZ-treated rats reveals a pattern of phosphorylation distinct from that obtained from control saline-treated rats or MK-801 plus PTZ treated rats. We discuss the possible implications of N-methyl-D-aspartate-receptor activation and MAP-2 dephosphorylation on the plastic changes induced in rat brain hippocampus after induced epileptiform activity.
Díez-Guerra
F J
FJ
Centro de Biología Molecular, Facultad de Ciencias, Universidad Autónoma de Madrid, Spain.
Avila
J
J
D000818:Animals; D006624:Hippocampus / Q000378:metabolism*; D008297:Male; D008869:Microtubule-Associated Proteins / Q000378:metabolism*; D010433:Pentylenetetrazole; D010766:Phosphorylation; D051381:Rats; D017208:Rats, Wistar; D012640:Seizures / Q000139:chemically induced / Q000378:metabolism*
D008869:Microtubule-Associated Proteins; D010433:Pentylenetetrazole