Abstract:
:Little is known about how small variations in ionic currents and Ca²⁺ and Na⁺ diffusion coefficients impact action potential and Ca²⁺ dynamics in rabbit ventricular myocytes. We applied sensitivity analysis to quantify the sensitivity of Shannon et al. model (Biophys. J., 2004) to 5%-10% changes in currents conductance, channels distribution, and ion diffusion in rabbit ventricular cells. We found that action potential duration and Ca²⁺ peaks are highly sensitive to 10% increase in L-type Ca²⁺ current; moderately influenced by 10% increase in Na⁺-Ca²⁺ exchanger, Na⁺-K⁺ pump, rapid delayed and slow transient outward K⁺ currents, and Cl⁻ background current; insensitive to 10% increases in all other ionic currents and sarcoplasmic reticulum Ca²⁺ fluxes. Cell electrical activity is strongly affected by 5% shift of L-type Ca²⁺ channels and Na⁺-Ca²⁺ exchanger in between junctional and submembrane spaces while Ca²⁺-activated Cl⁻-channel redistribution has the modest effect. Small changes in submembrane and cytosolic diffusion coefficients for Ca²⁺, but not in Na⁺ transfer, may alter notably myocyte contraction. Our studies highlight the need for more precise measurements and further extending and testing of the Shannon et al. model. Our results demonstrate usefulness of sensitivity analysis to identify specific knowledge gaps and controversies related to ventricular cell electrophysiology and Ca²⁺ signaling.
journal_name
Biomed Res Intjournal_title
BioMed research internationalauthors
Lo YH,Peachey T,Abramson D,McCulloch A,Michailova Adoi
10.1155/2013/565431subject
Has Abstractpub_date
2013-01-01 00:00:00pages
565431eissn
2314-6133issn
2314-6141journal_volume
2013pub_type
杂志文章abstract::GHK (glycyl-L-histidyl-L-lysine) is present in human plasma, saliva, and urine but declines with age. It is proposed that GHK functions as a complex with copper 2+ which accelerates wound healing and skin repair. GHK stimulates both synthesis and breakdown of collagen and glycosaminoglycans and modulates the activity ...
journal_title:BioMed research international
pub_type: 杂志文章,评审
doi:10.1155/2015/648108
更新日期:2015-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2018/6075705
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journal_title:BioMed research international
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1155/2018/2065232
更新日期:2018-09-30 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
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journal_title:BioMed research international
pub_type: 杂志文章,评审
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2017/3691819
更新日期:2017-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2014/827635
更新日期:2014-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
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更新日期:2013-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2018/1431396
更新日期:2018-08-29 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2015/359130
更新日期:2015-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2017/9234672
更新日期:2017-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2015/256916
更新日期:2015-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章,评审
doi:10.1155/2014/367939
更新日期:2014-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章,随机对照试验
doi:10.1155/2014/896183
更新日期:2014-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2019/3689091
更新日期:2019-01-31 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2016/1715053
更新日期:2016-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2013/530382
更新日期:2013-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章,评审
doi:10.1155/2017/5716835
更新日期:2017-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
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journal_title:BioMed research international
pub_type: 临床试验,杂志文章
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journal_title:BioMed research international
pub_type: 杂志文章,评审
doi:10.1155/2018/1483791
更新日期:2018-07-12 00:00:00
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pub_type: 杂志文章
doi:10.1155/2015/687541
更新日期:2015-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2017/3125842
更新日期:2017-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章,评审
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journal_title:BioMed research international
pub_type: 临床试验,杂志文章
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pub_type: 杂志文章
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更新日期:2014-01-01 00:00:00
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journal_title:BioMed research international
pub_type: 杂志文章
doi:10.1155/2020/6319395
更新日期:2020-09-28 00:00:00