A four-component model of the action potential in mouse detrusor smooth muscle cell.
Detrusor smooth muscle cells (DSMCs) of the urinary bladder are electrically connected to one another via gap junctions and form a three dimensional syncytium. DSMCs exhibit spontaneous electrical activity, including passive depolarizations and action potentials. The shapes of spontaneous action pot...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2018-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC5774707?pdf=render |
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| author | Mithun Padmakumar Keith L Brain John S Young Rohit Manchanda |
| author_facet | Mithun Padmakumar Keith L Brain John S Young Rohit Manchanda |
| author_sort | Mithun Padmakumar |
| collection | DOAJ |
| description | Detrusor smooth muscle cells (DSMCs) of the urinary bladder are electrically connected to one another via gap junctions and form a three dimensional syncytium. DSMCs exhibit spontaneous electrical activity, including passive depolarizations and action potentials. The shapes of spontaneous action potentials (sAPs) observed from a single DSM cell can vary widely. The biophysical origins of this variability, and the precise components which contribute to the complex shapes observed are not known. To address these questions, the basic components which constitute the sAPs were investigated. We hypothesized that linear combinations of scaled versions of these basic components can produce sAP shapes observed in the syncytium.The basic components were identified as spontaneous evoked junction potentials (sEJP), native AP (nAP), slow after hyperpolarization (sAHP) and very slow after hyperpolarization (vsAHP). The experimental recordings were grouped into two sets: a training data set and a testing data set. A training set was used to estimate the components, and a test set to evaluate the efficiency of the estimated components. We found that a linear combination of the identified components when appropriately amplified and time shifted replicated various AP shapes to a high degree of similarity, as quantified by the root mean square error (RMSE) measure.We conclude that the four basic components-sEJP, nAP, sAHP, and vsAHP-identified and isolated in this work are necessary and sufficient to replicate all varieties of the sAPs recorded experimentally in DSMCs. This model has the potential to generate testable hypotheses that can help identify the physiological processes underlying various features of the sAPs. Further, this model also provides a means to classify the sAPs into various shape classes. |
| first_indexed | 2024-12-11T08:30:23Z |
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| id | doaj.art-c82f7bcec74e4a2aa255926a64d018c1 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-11T08:30:23Z |
| publishDate | 2018-01-01 |
| publisher | Public Library of Science (PLoS) |
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| series | PLoS ONE |
| spelling | doaj.art-c82f7bcec74e4a2aa255926a64d018c12022-12-22T01:14:28ZengPublic Library of Science (PLoS)PLoS ONE1932-62032018-01-01131e019001610.1371/journal.pone.0190016A four-component model of the action potential in mouse detrusor smooth muscle cell.Mithun PadmakumarKeith L BrainJohn S YoungRohit ManchandaDetrusor smooth muscle cells (DSMCs) of the urinary bladder are electrically connected to one another via gap junctions and form a three dimensional syncytium. DSMCs exhibit spontaneous electrical activity, including passive depolarizations and action potentials. The shapes of spontaneous action potentials (sAPs) observed from a single DSM cell can vary widely. The biophysical origins of this variability, and the precise components which contribute to the complex shapes observed are not known. To address these questions, the basic components which constitute the sAPs were investigated. We hypothesized that linear combinations of scaled versions of these basic components can produce sAP shapes observed in the syncytium.The basic components were identified as spontaneous evoked junction potentials (sEJP), native AP (nAP), slow after hyperpolarization (sAHP) and very slow after hyperpolarization (vsAHP). The experimental recordings were grouped into two sets: a training data set and a testing data set. A training set was used to estimate the components, and a test set to evaluate the efficiency of the estimated components. We found that a linear combination of the identified components when appropriately amplified and time shifted replicated various AP shapes to a high degree of similarity, as quantified by the root mean square error (RMSE) measure.We conclude that the four basic components-sEJP, nAP, sAHP, and vsAHP-identified and isolated in this work are necessary and sufficient to replicate all varieties of the sAPs recorded experimentally in DSMCs. This model has the potential to generate testable hypotheses that can help identify the physiological processes underlying various features of the sAPs. Further, this model also provides a means to classify the sAPs into various shape classes.http://europepmc.org/articles/PMC5774707?pdf=render |
| spellingShingle | Mithun Padmakumar Keith L Brain John S Young Rohit Manchanda A four-component model of the action potential in mouse detrusor smooth muscle cell. PLoS ONE |
| title | A four-component model of the action potential in mouse detrusor smooth muscle cell. |
| title_full | A four-component model of the action potential in mouse detrusor smooth muscle cell. |
| title_fullStr | A four-component model of the action potential in mouse detrusor smooth muscle cell. |
| title_full_unstemmed | A four-component model of the action potential in mouse detrusor smooth muscle cell. |
| title_short | A four-component model of the action potential in mouse detrusor smooth muscle cell. |
| title_sort | four component model of the action potential in mouse detrusor smooth muscle cell |
| url | http://europepmc.org/articles/PMC5774707?pdf=render |
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