A Modeling and Analysis Study Reveals That CaMKII in Synaptic Plasticity Is a Dominant Affecter in CaM Systems in a T286 Phosphorylation-Dependent Manner
NMDAR-dependent synaptic plasticity in the hippocampus consists of two opposing forces: long-term potentiation (LTP), which strengthens synapses and long-term depression (LTD), which weakens synapses. LTP and LTD are associated with memory formation and loss, respectively. Synaptic plasticity is con...
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MDPI AG
2022-09-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/27/18/5974 |
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| author | Hamish Stevens-Bullmore Don Kulasiri Sandhya Samarasinghe |
| author_facet | Hamish Stevens-Bullmore Don Kulasiri Sandhya Samarasinghe |
| author_sort | Hamish Stevens-Bullmore |
| collection | DOAJ |
| description | NMDAR-dependent synaptic plasticity in the hippocampus consists of two opposing forces: long-term potentiation (LTP), which strengthens synapses and long-term depression (LTD), which weakens synapses. LTP and LTD are associated with memory formation and loss, respectively. Synaptic plasticity is controlled at a molecular level by Ca<sup>2+</sup>-mediated protein signaling. Here, Ca<sup>2+</sup> binds the protein, calmodulin (CaM), which modulates synaptic plasticity in both directions. This is because Ca<sup>2+</sup>-bound CaM activates both LTD-and LTP-inducing proteins. Understanding how CaM responds to Ca<sup>2+</sup> signaling and how this translates into synaptic plasticity is therefore important to understanding synaptic plasticity induction. In this paper, CaM activation by Ca<sup>2+</sup> and calmodulin binding to downstream proteins was mathematically modeled using differential equations. Simulations were monitored with and without theoretical knockouts and, global sensitivity analyses were performed to determine how Ca<sup>2+</sup>/CaM signaling occurred at various Ca<sup>2+</sup> signals when CaM levels were limiting. At elevated stimulations, the total CaM pool rapidly bound to its protein binding targets which regulate both LTP and LTD. This was followed by CaM becoming redistributed from low-affinity to high-affinity binding targets. Specifically, CaM was redistributed away from LTD-inducing proteins to bind the high-affinity LTP-inducing protein, calmodulin-dependent kinase II (CaMKII). In this way, CaMKII acted as a dominant affecter and repressed activation of opposing CaM-binding protein targets. The model thereby showed a novel form of CaM signaling by which the two opposing pathways crosstalk indirectly. The model also found that CaMKII can repress cAMP production by repressing CaM-regulated proteins, which catalyze cAMP production. The model also found that at low Ca<sup>2+</sup> stimulation levels, typical of LTD induction, CaM signaling was unstable and is therefore unlikely to alone be enough to induce synaptic depression. Overall, this paper demonstrates how limiting levels of CaM may be a fundamental aspect of Ca<sup>2+</sup> regulated signaling which allows crosstalk among proteins without requiring directly interaction. |
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| language | English |
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| spelling | doaj.art-0c5a1ea264a6421f8e460ff8c0a2209a2023-11-23T18:02:09ZengMDPI AGMolecules1420-30492022-09-012718597410.3390/molecules27185974A Modeling and Analysis Study Reveals That CaMKII in Synaptic Plasticity Is a Dominant Affecter in CaM Systems in a T286 Phosphorylation-Dependent MannerHamish Stevens-Bullmore0Don Kulasiri1Sandhya Samarasinghe2Centre for Advanced Computational Solutions (C-fACS), Department of Molecular Biosciences, Lincoln University, Lincoln 7647, New ZealandCentre for Advanced Computational Solutions (C-fACS), Department of Molecular Biosciences, Lincoln University, Lincoln 7647, New ZealandCentre for Advanced Computational Solutions (C-fACS), Department of Molecular Biosciences, Lincoln University, Lincoln 7647, New ZealandNMDAR-dependent synaptic plasticity in the hippocampus consists of two opposing forces: long-term potentiation (LTP), which strengthens synapses and long-term depression (LTD), which weakens synapses. LTP and LTD are associated with memory formation and loss, respectively. Synaptic plasticity is controlled at a molecular level by Ca<sup>2+</sup>-mediated protein signaling. Here, Ca<sup>2+</sup> binds the protein, calmodulin (CaM), which modulates synaptic plasticity in both directions. This is because Ca<sup>2+</sup>-bound CaM activates both LTD-and LTP-inducing proteins. Understanding how CaM responds to Ca<sup>2+</sup> signaling and how this translates into synaptic plasticity is therefore important to understanding synaptic plasticity induction. In this paper, CaM activation by Ca<sup>2+</sup> and calmodulin binding to downstream proteins was mathematically modeled using differential equations. Simulations were monitored with and without theoretical knockouts and, global sensitivity analyses were performed to determine how Ca<sup>2+</sup>/CaM signaling occurred at various Ca<sup>2+</sup> signals when CaM levels were limiting. At elevated stimulations, the total CaM pool rapidly bound to its protein binding targets which regulate both LTP and LTD. This was followed by CaM becoming redistributed from low-affinity to high-affinity binding targets. Specifically, CaM was redistributed away from LTD-inducing proteins to bind the high-affinity LTP-inducing protein, calmodulin-dependent kinase II (CaMKII). In this way, CaMKII acted as a dominant affecter and repressed activation of opposing CaM-binding protein targets. The model thereby showed a novel form of CaM signaling by which the two opposing pathways crosstalk indirectly. The model also found that CaMKII can repress cAMP production by repressing CaM-regulated proteins, which catalyze cAMP production. The model also found that at low Ca<sup>2+</sup> stimulation levels, typical of LTD induction, CaM signaling was unstable and is therefore unlikely to alone be enough to induce synaptic depression. Overall, this paper demonstrates how limiting levels of CaM may be a fundamental aspect of Ca<sup>2+</sup> regulated signaling which allows crosstalk among proteins without requiring directly interaction.https://www.mdpi.com/1420-3049/27/18/5974Ca<sup>2+</sup> signalingcalmodulincalmodulin-dependent kinase IIprotein phosphatase 1cell signalingmathematical model |
| spellingShingle | Hamish Stevens-Bullmore Don Kulasiri Sandhya Samarasinghe A Modeling and Analysis Study Reveals That CaMKII in Synaptic Plasticity Is a Dominant Affecter in CaM Systems in a T286 Phosphorylation-Dependent Manner Molecules Ca<sup>2+</sup> signaling calmodulin calmodulin-dependent kinase II protein phosphatase 1 cell signaling mathematical model |
| title | A Modeling and Analysis Study Reveals That CaMKII in Synaptic Plasticity Is a Dominant Affecter in CaM Systems in a T286 Phosphorylation-Dependent Manner |
| title_full | A Modeling and Analysis Study Reveals That CaMKII in Synaptic Plasticity Is a Dominant Affecter in CaM Systems in a T286 Phosphorylation-Dependent Manner |
| title_fullStr | A Modeling and Analysis Study Reveals That CaMKII in Synaptic Plasticity Is a Dominant Affecter in CaM Systems in a T286 Phosphorylation-Dependent Manner |
| title_full_unstemmed | A Modeling and Analysis Study Reveals That CaMKII in Synaptic Plasticity Is a Dominant Affecter in CaM Systems in a T286 Phosphorylation-Dependent Manner |
| title_short | A Modeling and Analysis Study Reveals That CaMKII in Synaptic Plasticity Is a Dominant Affecter in CaM Systems in a T286 Phosphorylation-Dependent Manner |
| title_sort | modeling and analysis study reveals that camkii in synaptic plasticity is a dominant affecter in cam systems in a t286 phosphorylation dependent manner |
| topic | Ca<sup>2+</sup> signaling calmodulin calmodulin-dependent kinase II protein phosphatase 1 cell signaling mathematical model |
| url | https://www.mdpi.com/1420-3049/27/18/5974 |
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