Do the calmodulin-stimulated adenylyl cyclases play a role in neuroplasticity?
Identifieur interne : 000D21 ( Main/Exploration ); précédent : 000D20; suivant : 000D22Do the calmodulin-stimulated adenylyl cyclases play a role in neuroplasticity?
Auteurs : Zhengui Xia [États-Unis] ; Eui-Ju Choi [États-Unis] ; Daniel R. Storm [États-Unis] ; Christine Blazynski [États-Unis]Source :
- Behavioral and Brain Sciences [ 0140-525X ] ; 1995-09.
Abstract
Evidence from invertebrate systems including Aplysia and Drosophila, as well as studies carried out with mammalian brain, suggests that Ca2+-sensitive adenylyl cyclases may be important for long-term synaptic changes and learning and memory. Furthermore, some forms of long-term potentiation (LTP) in the hippocampus elevate cyclic AMP (cAMP) signals, and activation of adenylyl cyclases and cAMP-dependent protein kinase may be required for late stages of LTP. We propose that long-term changes in neurons and at synapses may require synergism between the cAMP and Ca2+ signal transduction systems which regulates transcription and synthesis of specific proteins required for long-term synaptic changes. During LTP, protein kinase C is activated and intraccllular Ca2+ increases. We hypothesize that the calmodulin (CaM)-regulated adenylyl cyclases may be activated during LTP because of increases in intracellular Ca2+, release of free CaM from neuromodulin, activation by protein kinase C, release of neurotransmitters, or a combination of these events. Synergistic activation of CaM-sensitive adenylyl cyclases may produce a robust or prolonged cAMP signal required for transcriptional control. Furthermore, the coupling of the Ca2+ and cAMP systems may provide positive feedback regulation of Ca2+ channels by cAMP-dependent protein kinase
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DOI: 10.1017/S0140525X00039194
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<front><div type="abstract">Evidence from invertebrate systems including Aplysia and Drosophila, as well as studies carried out with mammalian brain, suggests that Ca2+-sensitive adenylyl cyclases may be important for long-term synaptic changes and learning and memory. Furthermore, some forms of long-term potentiation (LTP) in the hippocampus elevate cyclic AMP (cAMP) signals, and activation of adenylyl cyclases and cAMP-dependent protein kinase may be required for late stages of LTP. We propose that long-term changes in neurons and at synapses may require synergism between the cAMP and Ca2+ signal transduction systems which regulates transcription and synthesis of specific proteins required for long-term synaptic changes. During LTP, protein kinase C is activated and intraccllular Ca2+ increases. We hypothesize that the calmodulin (CaM)-regulated adenylyl cyclases may be activated during LTP because of increases in intracellular Ca2+, release of free CaM from neuromodulin, activation by protein kinase C, release of neurotransmitters, or a combination of these events. Synergistic activation of CaM-sensitive adenylyl cyclases may produce a robust or prolonged cAMP signal required for transcriptional control. Furthermore, the coupling of the Ca2+ and cAMP systems may provide positive feedback regulation of Ca2+ channels by cAMP-dependent protein kinase</div>
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