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Calcium-Stimulated Adenylyl Cyclases Required for Long-Term Potentiation in the Anterior Cingulate Cortex

Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada

Submitted 22 November 2004; accepted in final form 30 January 2005

Activity-dependent long-term potentiation (LTP) in the CNS is thought to be important in learning, memory, development, and persistent pain. Here, we report that NMDA receptor-dependent LTP is the major form of long-term plasticity in the anterior cingulate cortex (ACC). In addition to N-methyl-D-aspartate (NMDA) receptors, L-type voltage-gated calcium channels are also required for inducing LTP. Activation of calcium-stimulated adenylyl cyclase subtype 1 (AC1) is essential for the induction of LTP in ACC neurons, while AC8 subunit partially contributes to forskolin-induced potentiation. Our results suggest that calcium-stimulated cAMP-dependent signaling pathways play a critical role in cingulate LTP.

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