Sarco-endoplasmic reticulum calcium release model based on changes in the luminal calcium content
The sarcoplasmic/endoplasmic reticulum (SR/ER) is the main intracellular calcium (Ca2+) pool in muscle and non-muscle eukaryotic cells, respectively. The reticulum accumulates Ca2+ against its electrochemical gradient by the action of sarco/endoplasmic reticulum calcium ATPases (SERCA pumps), and th...
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| Main Authors: | , , , , , , |
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| Format: | Article (Journal) Chapter/Article |
| Language: | English |
| Published: |
24 October 2019
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| In: |
Calcium signaling
Year: 2019, Pages: 337-370 |
| DOI: | 10.1007/978-3-030-12457-1_14 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/978-3-030-12457-1_14
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| Author Notes: | Agustín Guerrero-Hernández, Víctor Hugo Sánchez-Vázquez, Ericka Martínez-Martínez, Lizeth Sandoval-Vázquez, Norma C. Perez-Rosas, Rodrigo Lopez-Farias, Adan Dagnino-Acosta |
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| 245 | 1 | 0 | |a Sarco-endoplasmic reticulum calcium release model based on changes in the luminal calcium content |c Agustín Guerrero-Hernández, Víctor Hugo Sánchez-Vázquez, Ericka Martínez-Martínez, Lizeth Sandoval-Vázquez, Norma C. Perez-Rosas, Rodrigo Lopez-Farias, Adan Dagnino-Acosta |
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| 520 | |a The sarcoplasmic/endoplasmic reticulum (SR/ER) is the main intracellular calcium (Ca2+) pool in muscle and non-muscle eukaryotic cells, respectively. The reticulum accumulates Ca2+ against its electrochemical gradient by the action of sarco/endoplasmic reticulum calcium ATPases (SERCA pumps), and the capacity of this Ca2+ store is increased by the presence of Ca2+ binding proteins in the lumen of the reticulum. A diversity of physical and chemical signals, activate the main Ca2+ release channels, i.e. ryanodine receptors (RyRs) and inositol (1, 4, 5) trisphosphate receptors (IP3Rs), to produce transient elevations of the cytoplasmic calcium concentration ([Ca2+]i) while the reticulum is being depleted of Ca2+. This picture is incomplete because it implies that the elements involved in the Ca2+ release process are acting alone and independently of each other. However, it appears that the Ca2+ released by RyRs and IP3Rs is trapped in luminal Ca2+ binding proteins (Ca2+ lattice), which are associated with these release channels, and the activation of these channels appears to facilitate that the trapped Ca2+ ions become available for release. This situation makes the initial stage of the Ca2+ release process a highly efficient one; accordingly, there is a large increase in the [Ca2+]i with minimal reductions in the bulk of the free luminal SR/ER [Ca2+] ([Ca2+]SR/ER). Additionally, it has been shown that active SERCA pumps are required for attaining this highly efficient Ca2+ release process. All these data indicate that Ca2+ release by the SR/ER is a highly regulated event and not just Ca2+ coming down its electrochemical gradient via the open release channels. One obvious advantage of this sophisticated Ca2+ release process is to avoid depletion of the ER Ca2+ store and accordingly, to prevent the activation of ER stress during each Ca2+ release event. | ||
| 650 | 4 | |a Calcium buffer capacity | |
| 650 | 4 | |a Endoplasmic reticulum (ER) | |
| 650 | 4 | |a IP3 receptors (IP3Rs) | |
| 650 | 4 | |a Kinetics on demand (KonD) | |
| 650 | 4 | |a Ryanodine receptors (RyRs) | |
| 650 | 4 | |a Sarco-endoplasmic reticulum calcium ATPase (SERCA pump) | |
| 650 | 4 | |a Sarcoplasmic reticulum (SR) | |
| 700 | 1 | |a Sánchez-Vázquez, Víctor Hugo |e VerfasserIn |4 aut | |
| 700 | 1 | |a Martínez-Martínez, Ericka |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sandoval-Vázquez, Lizeth |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Lopez-Farias, Rodrigo |e VerfasserIn |4 aut | |
| 700 | 1 | |a Dagnino-Acosta, Adan |e VerfasserIn |4 aut | |
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