LTP but not seizure is associated with up-regulation of AKAP-150

Génin, A., French, P., Doyère, V., Davis, S., Errington, M.L., Maroun, M., Stean, T., Truchet, B., Webber, M., Wills, T., Richter-Levin, G., Sanger, G., Hunt, S.P., Mallet, J., Laroche, S., Bliss, T.V.P. and O'Connor, V. (2003) LTP but not seizure is associated with up-regulation of AKAP-150. European Journal of Neuroscience, 17 (2), 331-334. (doi:10.1046/j.1460-9568.2003.02462.x).

Abstract

We have used differential display to profile and compare the mRNAs expressed in the hippocampus of freely moving animals after the induction of long-term potentiation (LTP) at the perforant path–dentate gyrus synapse with control rats receiving low-frequency stimulation. We have combined this with in situ hybridization and have identified A-kinase anchoring protein of 150 kDa (AKAP-150) as a gene selectively up-regulated during the maintenance phase of LTP. AKAP-150 mRNA has a biphasic modulation in the dentate gyrus following the induction of LTP. The expression of AKAP-150 was 29% lower than stimulated controls 1 h after the induction of LTP. Its expression was enhanced 3 (50%), 6 (239%) and 12 h (210%) after induction, returning to control levels by 24 h postinduction. The NMDA receptor antagonist CPP blocked the tetanus-induced modulation of AKAP-150 expression. Interestingly, strong generalized stimulation produced by electroconvulsive shock did not increase the expression of AKAP-150. This implies that the AKAP-150 harbours a novel property of selective responsiveness to the stimulation patterns that trigger NMDA-dependent LTP in vivo. Its selective up-regulation during LTP and its identified functions as a scaffold for protein kinase A, protein kinase C, calmodulin, calcineurin and ionotropic glutamate receptors suggest that AKAP-150 encodes is an important effector protein in the expression of late LTP.

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Contributors

Author: V. O'Connor

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