Analysis of spontaneous depolarization-linked hyperpolarizations in mouse detrusor smooth muscle cells

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Analysis of spontaneous depolarization-linked hyperpolarizations in mouse detrusor smooth muscle cells. / Padmakumar, Mithun; Brain, Keith; Manchanda, Rohit.

In: Biomedical Research Journal, Vol. 6, No. 2, 22.11.2019, p. 49-55.

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@article{023a6a30ac0243f08b54356b5ce082e8,
title = "Analysis of spontaneous depolarization-linked hyperpolarizations in mouse detrusor smooth muscle cells",
abstract = "Background: Urinary bladder detrusor smooth muscle cells exhibit spontaneous electrical activities comprising various signal types. Aims and Objectives: This article introduces and analyzes a rare category of signals observed in such activity, named spontaneous depolarization-linked hyperpolarization (sDLH). Materials and Methods: A mouse model was used in the study, where all the occurrences of sDLHs were pooled together from multiple intracellular recording sessions. Four features – (i) resting membrane potential (RMP) (R, in mV), (ii) depolarization amplitude (D, in mV), (iii) hyperpolarization amplitude (H, in mV), and (iv) time course of the hyperpolarization (T, in ms) – were evaluated from all sDLHs. Results: The analysis of results indicated that (a) the signals appear more frequently in cells with higher RMP, (b) the depolarization amplitudes seem to be distributed randomly and have no correlation with other features, (c) hyperpolarization amplitudes show two distinct clusters and exhibit strong correlation with the RMP, and (d) time course of hyperpolarization phase shows no distinct groups and is distributed in a window larger than that of any other signals seen in the intracellular recordings. With the help of the results obtained from the analysis, a hypothesis for the biophysical origin of these signals is proposed. Conclusions: This needs to be tested experimentally, and if proved right, would help extend the boundaries of our current understanding of the detrusor smooth muscle system.",
keywords = "Detrusor overactivity, Electrophysiology, Smooth muscle cells, Urinary Bladder",
author = "Mithun Padmakumar and Keith Brain and Rohit Manchanda",
year = "2019",
month = nov,
day = "22",
doi = "10.4103/BMRJ.BMRJ_9_19",
language = "English",
volume = "6",
pages = "49--55",
journal = "Biomedical Research Journal",
issn = "2349-3666",
publisher = "NMIMS Sunandan Divatia School of Science ",
number = "2",

}

RIS

TY - JOUR

T1 - Analysis of spontaneous depolarization-linked hyperpolarizations in mouse detrusor smooth muscle cells

AU - Padmakumar, Mithun

AU - Brain, Keith

AU - Manchanda, Rohit

PY - 2019/11/22

Y1 - 2019/11/22

N2 - Background: Urinary bladder detrusor smooth muscle cells exhibit spontaneous electrical activities comprising various signal types. Aims and Objectives: This article introduces and analyzes a rare category of signals observed in such activity, named spontaneous depolarization-linked hyperpolarization (sDLH). Materials and Methods: A mouse model was used in the study, where all the occurrences of sDLHs were pooled together from multiple intracellular recording sessions. Four features – (i) resting membrane potential (RMP) (R, in mV), (ii) depolarization amplitude (D, in mV), (iii) hyperpolarization amplitude (H, in mV), and (iv) time course of the hyperpolarization (T, in ms) – were evaluated from all sDLHs. Results: The analysis of results indicated that (a) the signals appear more frequently in cells with higher RMP, (b) the depolarization amplitudes seem to be distributed randomly and have no correlation with other features, (c) hyperpolarization amplitudes show two distinct clusters and exhibit strong correlation with the RMP, and (d) time course of hyperpolarization phase shows no distinct groups and is distributed in a window larger than that of any other signals seen in the intracellular recordings. With the help of the results obtained from the analysis, a hypothesis for the biophysical origin of these signals is proposed. Conclusions: This needs to be tested experimentally, and if proved right, would help extend the boundaries of our current understanding of the detrusor smooth muscle system.

AB - Background: Urinary bladder detrusor smooth muscle cells exhibit spontaneous electrical activities comprising various signal types. Aims and Objectives: This article introduces and analyzes a rare category of signals observed in such activity, named spontaneous depolarization-linked hyperpolarization (sDLH). Materials and Methods: A mouse model was used in the study, where all the occurrences of sDLHs were pooled together from multiple intracellular recording sessions. Four features – (i) resting membrane potential (RMP) (R, in mV), (ii) depolarization amplitude (D, in mV), (iii) hyperpolarization amplitude (H, in mV), and (iv) time course of the hyperpolarization (T, in ms) – were evaluated from all sDLHs. Results: The analysis of results indicated that (a) the signals appear more frequently in cells with higher RMP, (b) the depolarization amplitudes seem to be distributed randomly and have no correlation with other features, (c) hyperpolarization amplitudes show two distinct clusters and exhibit strong correlation with the RMP, and (d) time course of hyperpolarization phase shows no distinct groups and is distributed in a window larger than that of any other signals seen in the intracellular recordings. With the help of the results obtained from the analysis, a hypothesis for the biophysical origin of these signals is proposed. Conclusions: This needs to be tested experimentally, and if proved right, would help extend the boundaries of our current understanding of the detrusor smooth muscle system.

KW - Detrusor overactivity

KW - Electrophysiology

KW - Smooth muscle cells

KW - Urinary Bladder

U2 - 10.4103/BMRJ.BMRJ_9_19

DO - 10.4103/BMRJ.BMRJ_9_19

M3 - Article

VL - 6

SP - 49

EP - 55

JO - Biomedical Research Journal

JF - Biomedical Research Journal

SN - 2349-3666

IS - 2

ER -