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Electrophysiological modelling of pulmonary artery smooth muscle cells in the rabbits--special consideration to the generation of hypoxic pulmonary vasoconstriction

Cited 9 time in Web of Science Cited 7 time in Scopus
Authors
Cha, Chae Young; Earm, Kee Hyun; Youm, Jae Boum; Baek, Eun Bok; Kim, Sung Joon; Earm, Yung E
Issue Date
2007-10-05
Publisher
Elsevier
Citation
Prog Biophys Mol Biol. 96(1-3), 399-420
Keywords
AnimalsAnoxia/*metabolism*Cardiac ElectrophysiologyHumans*Models, CardiovascularMyocytes, Smooth Muscle/*physiologyPulmonary Artery/cytology/*physiologyRabbitsVasoconstriction/*physiology
Abstract
In vascular smooth muscle cells, it has been suggested that membrane potential is an important component that initiates contraction. We developed a mathematical model to elucidate the quantitative contributions of major ion currents [a voltage-gated L-type Ca2+ current (ICaL), a voltage-sensitive K+ current (IKV), a Ca2+-activated K+ current (IKCa) and a nonselective cation current (INSC)] to membrane potential. In order to typify the diverse nature of pulmonary artery smooth muscle cells (PASMCs), we introduced parameters that are not fixed (variable parameters). The population of cells with different parameters was constructed and the cells that have the electrophysiological properties of PASMCs were selected. The contributions of each membrane current were investigated by sensitivity analysis and modification of the current parameters. Consequently, IKV and INSC were found to be the most important currents that affect the membrane potential. The occurrence of depolarisation in hypoxic pulmonary vasoconstriction (HPV) was also examined. In hypoxia, IKV and IKCa were reduced, but the consequent depolarisation in simulation was not enough to initiate contractions. If we add an increase of INSC (2.5-fold), the calculated membrane potential was enough to induce contraction. From the results, we conclude that the balance of various ion channel activities determines the resting membrane potential of PASMCs and our model was successful in explaining the depolarisation in HPV. Therefore, this model can be a powerful tool to investigate the various electrical properties of PASMCs in both normal and pathological conditions.
ISSN
0079-6107 (Print)
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=17915297

http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TBN-4PC8RD7-1-W&_cdi=5147&_user=168665&_orig=search&_coverDate=04%2F30%2F2008&_sk=999039998&view=c&wchp=dGLbVzW-zSkWb&md5=61e2767c583471afe5c905e6d4a5ce45&ie=/sdarticle.pdf

http://hdl.handle.net/10371/68112
DOI
https://doi.org/10.1016/j.pbiomolbio.2007.07.007
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College of Medicine/School of Medicine (의과대학/대학원)Dept. of Physiology (생리학교실)Journal Papers (저널논문_생리학교실)
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