Universität zu Köln

Vikhorev, Petr G., Smoktunowicz, Natalia, Munster, Alex B., Copeland, O'Neal, Kostin, Sawa, Montgiraud, Cecile, Messer, Andrew E., Toliat, Mohammad R., Li, Amy ORCID: 0000-0001-5413-3771, dos Remedios, Cristobal G., Lal, Sean, Blair, Cheavar A., Campbell, Kenneth S., Guglin, Maya, Knoll, Ralph and Marston, Steven B. (2017). Abnormal contractility in human heart myofibrils from patients with dilated cardiomyopathy due to mutations in TTN and contractile protein genes. Sci Rep, 7. LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

Full text not available from this repository.

Abstract

Dilated cardiomyopathy (DCM) is an important cause of heart failure. Single gene mutations in at least 50 genes have been proposed to account for 25-50% of DCM cases and up to 25% of inherited DCM has been attributed to truncating mutations in the sarcomeric structural protein titin (TTNtv). Whilst the primary molecular mechanism of some DCM-associated mutations in the contractile apparatus has been studied in vitro and in transgenic mice, the contractile defect in human heart muscle has not been studied. In this study we isolated cardiac myofibrils from 3 TTNtv mutants, and 3 with contractile protein mutations (TNNI3 K36Q, TNNC1 G159D and MYH7 E1426K) and measured their contractility and passive stiffness in comparison with donor heart muscle as a control. We found that the three contractile protein mutations but not the TTNtv mutations had faster relaxation kinetics. Passive stiffness was reduced about 38% in all the DCM mutant samples. However, there was no change in maximum force or the titin N2BA/N2B isoform ratio and there was no titin haploinsufficiency. The decrease in myofibril passive stiffness was a common feature in all hearts with DCM-associated mutations and may be causative of DCM.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Vikhorev, Petr G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smoktunowicz, Natalia UNSPECIFIED UNSPECIFIED UNSPECIFIED Munster, Alex B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Copeland, O'Neal UNSPECIFIED UNSPECIFIED UNSPECIFIED Kostin, Sawa UNSPECIFIED UNSPECIFIED UNSPECIFIED Montgiraud, Cecile UNSPECIFIED UNSPECIFIED UNSPECIFIED Messer, Andrew E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Toliat, Mohammad R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, Amy UNSPECIFIED orcid.org/0000-0001-5413-3771 UNSPECIFIED dos Remedios, Cristobal G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lal, Sean UNSPECIFIED UNSPECIFIED UNSPECIFIED Blair, Cheavar A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Campbell, Kenneth S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Guglin, Maya UNSPECIFIED UNSPECIFIED UNSPECIFIED Knoll, Ralph UNSPECIFIED UNSPECIFIED UNSPECIFIED Marston, Steven B. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-213125
DOI:	10.1038/s41598-017-13675-8
Journal or Publication Title:	Sci Rep
Volume:	7
Date:	2017
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TROPONIN-I PHOSPHORYLATION; LENGTH-DEPENDENT ACTIVATION; HUMAN CARDIAC MYOFIBRILS; FRANK-STARLING MECHANISM; TENSION GENERATION; HYPERTROPHIC CARDIOMYOPATHY; CA2+ SENSITIVITY; TITIN; FAILURE; MYOSIN Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21312