Hippocampus-dependent memory formation: do memory type-specific mechanisms exist?
Long-term memory (LTM) formation requires gene transcription and de novo protein synthesis. The transcription factor CREB is required for hippocampus-dependent LTM formation, and it is activated by several signaling pathways, including protein kinase A (PKA), the mitogen activated protein/extracellular signal-regulated kinases (MAPK or ERKs), and Ca(2+)/calmodulin kinases (CaMKs). However, it is unknown whether all types of hippocampus-dependent LTM use the same signaling to activate transcription, and whether the transcriptional output is the same. Here we present molecular genetic and behavioral studies to demonstrate that two types of hippocampus-dependent LTM formation, spatial and contextual, require different signaling molecules. This can be illustrated by the CaMK kinases, CaMKKalpha, and CaMKKbeta, which have converse roles. CaMKKalpha is required for contextual and CaMKKbeta is required for spatial LTM formation. This leads to the surprising conclusion that there are distinct types of hippocampus-dependent LTM, which differ in their underlying molecular mechanisms.
Mizuno
Keiko
K
Wolfson Institute for Biomedical Research, University College London, UK.
Giese
Karl Peter
KP
D019208:Brain-Derived Neurotrophic Factor / Q000502:physiology; D054737:Calcium-Calmodulin-Dependent Protein Kinase Kinase; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000502:physiology; D017362:Cyclic AMP Response Element-Binding Protein; D005260:Female; D006624:Hippocampus / Q000502:physiology*; D006801:Humans; D008568:Memory; D017346:Protein Serine-Threonine Kinases / Q000502:physiology; D016760:Proto-Oncogene Proteins c-fos / Q000502:physiology; D014157:Transcription Factors / Q000502:physiology
D019208:Brain-Derived Neurotrophic Factor; C115163:CREB1 protein, human; D017362:Cyclic AMP Response Element-Binding Protein; D016760:Proto-Oncogene Proteins c-fos; D014157:Transcription Factors; D017346:Protein Serine-Threonine Kinases; D054737:Calcium-Calmodulin-Dependent Protein Kinase Kinase; D017871:Calcium-Calmodulin-Dependent Protein Kinases