The R21C Mutation in Cardiac Troponin I Imposes Differences in Contractile Force Generation between the Left and Right Ventricles of Knock-In Mice
Joint Authors
Liang, Jingsheng
Kazmierczak, Katarzyna
Rojas, Ana I.
Wang, Yingcai
Szczesna-Cordary, Danuta
Source
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-04-16
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
We investigated the effect of the hypertrophic cardiomyopathy-linked R21C (arginine to cysteine) mutation in human cardiac troponin I (cTnI) on the contractile properties and myofilament protein phosphorylation in papillary muscle preparations from left (LV) and right (RV) ventricles of homozygous R21C+/+ knock-in mice.
The maximal steady-state force was significantly reduced in skinned papillary muscle strips from the LV compared to RV, with the latter displaying the level of force observed in LV or RV from wild-type (WT) mice.
There were no differences in the Ca2+ sensitivity between the RV and LV of R21C+/+ mice; however, the Ca2+ sensitivity of force was higher in RV-R21C+/+ compared with RV-WT and lower in LV- R21C+/+ compared with LV-WT.
We also observed partial loss of Ca2+ regulation at low [Ca2+].
In addition, R21C+/+-KI hearts showed no Ser23/24-cTnI phosphorylation compared to LV or RV of WT mice.
However, phosphorylation of the myosin regulatory light chain (RLC) was significantly higher in the RV versus LV of R21C+/+ mice and versus LV and RV of WT mice.
The difference in RLC phosphorylation between the ventricles of R21C+/+ mice likely contributes to observed differences in contractile force and the lower tension monitored in the LV of HCM mice.
American Psychological Association (APA)
Liang, Jingsheng& Kazmierczak, Katarzyna& Rojas, Ana I.& Wang, Yingcai& Szczesna-Cordary, Danuta. 2015. The R21C Mutation in Cardiac Troponin I Imposes Differences in Contractile Force Generation between the Left and Right Ventricles of Knock-In Mice. BioMed Research International،Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1056583
Modern Language Association (MLA)
Liang, Jingsheng…[et al.]. The R21C Mutation in Cardiac Troponin I Imposes Differences in Contractile Force Generation between the Left and Right Ventricles of Knock-In Mice. BioMed Research International No. 2015 (2015), pp.1-9.
https://search.emarefa.net/detail/BIM-1056583
American Medical Association (AMA)
Liang, Jingsheng& Kazmierczak, Katarzyna& Rojas, Ana I.& Wang, Yingcai& Szczesna-Cordary, Danuta. The R21C Mutation in Cardiac Troponin I Imposes Differences in Contractile Force Generation between the Left and Right Ventricles of Knock-In Mice. BioMed Research International. 2015. Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1056583
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1056583