Show simple item record

dc.contributor.authorYalamanchili, Keertana
dc.contributor.authorAfzal, Nasrin
dc.contributor.authorBoyman, Liron
dc.contributor.authorMannella, Carmen A
dc.contributor.authorLederer, W Jonathan
dc.contributor.authorJafri, M Saleet
dc.date.accessioned2022-05-31T13:55:54Z
dc.date.available2022-05-31T13:55:54Z
dc.date.issued2022-04-30
dc.identifier.urihttp://hdl.handle.net/10713/19026
dc.description.abstractThe mitochondrial permeability transition pore (mPTP) is a non-selective pore in the inner mitochondrial membrane (IMM) which causes depolarization when it opens under conditions of oxidative stress and high concentrations of Ca2+. In this study, a stochastic computational model was developed to better understand the dynamics of mPTP opening and closing associated with elevated reactive oxygen species (ROS) in cardiomyocytes. The data modeled are from "photon stress" experiments in which the fluorescent dye TMRM (tetramethylrhodamine methyl ester) is both the source of ROS (induced by laser light) and sensor of the electrical potential difference across the IMM. Monte Carlo methods were applied to describe opening and closing of the pore along with the Hill Equation to account for the effect of ROS levels on the transition probabilities. The amplitude distribution of transient mPTP opening events, the number of transient mPTP opening events per minute in a cell, the time it takes for recovery after transient depolarizations in the mitochondria, and the change in TMRM fluorescence during the transition from transient to permanent mPTP opening events were analyzed. The model suggests that mPTP transient open times have an exponential distribution that are reflected in TMRM fluorescence. A second multiple pore model in which individual channels have no permanent open state suggests that 5-10 mPTP per mitochondria would be needed for sustained mitochondrial depolarization at elevated ROS with at least 1 mPTP in the transient open state.en_US
dc.description.urihttps://doi.org/10.3390/membranes12050494en_US
dc.language.isoenen_US
dc.publisherMDPI AGen_US
dc.relationThe model code is available in Appendix A.en_US
dc.relation.ispartofMembranesen_US
dc.relation.urihttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC9146742/#app1-membranes-12-00494en_US
dc.subjectMonte Carlo methoden_US
dc.subjectTMRMen_US
dc.subjectcomputational modelen_US
dc.subjectdepolarizationen_US
dc.subjecthearten_US
dc.subjectmPTPen_US
dc.subjectmitochondriaen_US
dc.subjectreactive oxygen species (ROS)en_US
dc.titleUnderstanding the Dynamics of the Transient and Permanent Opening Events of the Mitochondrial Permeability Transition Pore with a Novel Stochastic Model.en_US
dc.typeArticleen_US
dc.identifier.doi10.3390/membranes12050494
dc.identifier.pmid35629820
dc.source.journaltitleMembranes
dc.source.volume12
dc.source.issue5
dc.source.countrySwitzerland


This item appears in the following Collection(s)

Show simple item record