Requirement of extracellular signal-regulated kinase/mitogen-activated protein kinase for long-term potentiation in adult mouse anterior cingulate cortex.
Long-term potentiation (LTP) in the anterior cingulate cortex (ACC) is believed to be critical for higher brain functions including emotion, learning, memory and chronic pain. N-methyl-D-aspartate (NMDA) receptor-dependent LTP is well studied and is thought to be important for learning and memory in mammalian brains. As the downstream target of NMDA receptors, the extracellular signal-regulated kinase (ERK) in the mitogen-activated protein kinase (MAPK) cascade has been extensively studied for its involvement in synaptic plasticity, learning and memory in hippocampus. By contrast, the role of ERK in cingulate LTP has not been investigated. In this study, we examined whether LTP in ACC requires the activation of ERK. We found that P42/P44 MAPK inhibitors, PD98059 and U0126, suppressed the induction of cingulate LTP that was induced by presynaptic stimulation with postsynaptic depolarization (the pairing protocol). We also showed that cingulate LTP induced by two other different protocols was also blocked by PD98059. Moreover, we found that these two inhibitors had no effect on the maintenance of cingulate LTP. Inhibitors of c-Jun N-terminal kinase (JNK) and p38, other members of MAPK family, SP600125 and SB203850, suppressed the induction of cingulate LTP generated by the pairing protocol. Thus, our study suggests that the MAPK signaling pathway is involved in the induction of cingulate LTP and plays a critical role in physiological conditions.
Toyoda
Hiroki
H
Department of Physiology, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada. hiroki.toyoda@utoronto.ca
Zhao
Ming-Gao
MG
Xu
Hui
H
Wu
Long-Jun
LJ
Ren
Ming
M
Zhuo
Min
M
D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002540:Cerebral Cortex / Q000201:enzymology* / Q000502:physiology*; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects; D048049:Extracellular Signal-Regulated MAP Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D005419:Flavonoids / Q000494:pharmacology; D017774:Long-Term Potentiation / Q000187:drug effects; D051379:Mice; D008810:Mice, Inbred C57BL; D010852:Picrotoxin / Q000494:pharmacology; D047428:Protein Kinase Inhibitors / Q000008:administration & dosage / Q000494:pharmacology; D018091:Receptors, AMPA / Q000378:metabolism; D016194:Receptors, N-Methyl-D-Aspartate / Q000378:metabolism; D013569:Synapses / Q000187:drug effects / Q000201:enzymology
D048049:Extracellular Signal-Regulated MAP Kinases; D005419:Flavonoids; D010852:Picrotoxin; D047428:Protein Kinase Inhibitors; D018091:Receptors, AMPA; D016194:Receptors, N-Methyl-D-Aspartate; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one