ERIC Number: EJ792703
Record Type: Journal
Publication Date: 2008-May
Beta-Adrenergic Receptor Activation during Distinct Patterns of Stimulation Critically Modulates the PKA-Dependence of LTP in the Mouse Hippocampus
Gelinas, Jennifer N.; Tenorio, Gustavo; Lemon, Neal; Abel, Ted; Nguyen, Peter V.
Learning & Memory, v15 n5 p281-289 May 2008
Activation of Beta-adrenergic receptors (Beta-ARs) enhances hippocampal memory consolidation and long-term potentiation (LTP), a likely mechanism for memory storage. One signaling pathway linked to Beta-AR activation is the cAMP-PKA pathway. PKA is critical for the consolidation of hippocampal long-term memory and for the expression of some forms of long-lasting hippocampal LTP. How does Beta-AR activation affect the PKA-dependence, and persistence, of LTP elicited by distinct stimulation frequencies? Here, we use in vitro electrophysiology to show that patterns of stimulation determine the temporal phase of LTP affected by Beta-AR activation. In addition, only specific patterns of stimulation recruit PKA-dependent LTP following Beta-AR activation. Impairments of PKA-dependent LTP maintenance generated by pharmacologic or genetic deficiency of PKA activity are also abolished by concurrent activation of Beta-ARs. Taken together, our data show that, depending on patterns of synaptic stimulation, activation of Beta-ARs can gate the PKA-dependence and persistence of synaptic plasticity. We suggest that this may allow neuromodulatory receptors to fine-tune neural information processing to meet the demands imposed by numerous synaptic activity profiles. This is a form of "metaplasticity" that could control the efficacy of consolidation of hippocampal long-term memories.
Descriptors: Persistence, Stimulation, Long Term Memory, Cognitive Processes, Animals, Brain Hemisphere Functions, Biochemistry, Genetics, Drug Therapy
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A