Cited by 74Cardiomyopathy and Myosin StudiesCardiac electrophysiology and arrhythmiasCardiac Fibrosis and Remodeling

Transgenic rabbit model for human troponin I-based hypertrophic cardiomyopathy

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Sanbe, Atsushi, James, Jeanne, Tuzcu, Volkan, Nas, Selman, Martin, Lisa, Gulick, James, Osinska, Hanna, Sakthivel, Sadayappan +6 more·2005·Circulation

Abstract

Background— Transgenic and gene-targeted models have focused on the mouse. Fundamental differences between the mouse and human exist in Ca 2+ handling during contraction/relaxation and in alterations in Ca 2+ flux during heart failure, with the rabbit more accurately reflecting the human system. Methods and Results— Cardiac troponin I (cTnI) mutations can cause familial hypertrophic cardiomyopathy. An inhibitory domain mutation, arginine146→glycine (cTnI 146Gly ), was modeled with the use of transgenic expression in the rabbit ventricle. cTnI 146Gly levels >40% of total cTnI were perinatally lethal, whereas replacement levels of 15% to 25% were well tolerated. cTnI 146Gly expression led to a leftward shift in the force-pCa 2+ curves with cardiomyocyte disarray, fibrosis, and altered connexin43 organization. In isolated cTnI 146Gly myocytes, twitch relaxation amplitudes were smaller than in normal cells, but [Ca] i transients and sarcoplasmic reticulum Ca 2+ load were not different. Detrended fluctuation analysis of the QT max intervals was used to evaluate the cardiac repolarization phase and showed a significantly higher scaling exponent in the transgenic animals. Conclusions— Expression of modest amounts of cTnI 146Gly led to subtle defects without severely affecting cardiac function. Aberrant connexin organization, subtle morphological deficits, and an altered fractal pattern of the repolarization phase of transgenic rabbits, in the absence of entropy or other ECG abnormalities, may indicate an early developing pathology before the onset of more obvious repolarization abnormalities or major alterations in cardiac mechanics.

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Registry

Crossref · 10.1161/01.cir.0000164234.24957.75

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38 of 38 references verified0 citation errors · 0 not checkable

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  • Rabbits harboring human hypertrophic cardiomyopathy mutations often better recapitulate this category of human diseases than their murine model equivalents.

    “rabbits harboring human hypertrophic cardiomyopathy mutations often better recapitulate this category of human diseases than their murine model equivalents (Marian, et al., 1999; Sanbe, et al., 2005).”

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Authors
Sanbe, A., James, J., Tuzcu, V., Nas, S., Martin, L., Gulick, J., Osinska, H., Sakthivel, S., Klevitsky, R., Ginsburg, K. S., Bers, D. M., Zinman, B., Lakatta, E. G., & Robbins, J.
Affiliations
  • Cincinnati Children's Hospital Medical Center (US)
  • From the Divisions of Molecular Cardiovascular Biology (A.S., J.J., L.M., J.G., H.O., S.S., R.K., J.R.) and Pediatric Cardiology (V.T., S.N.), Cincinnati Children’s Hospital Research Foundation, Cincinnati, Ohio; Loyola University Chicago, Department of Physiology and Cardiovascular Institute, Maywood, Ill (K.S.G., D.M.B.); and National Institute on Aging, Intramural Research Program, Gerontology Research Center, National Institutes of Health, Baltimore, Md (B.Z., E.G.L.).
Venue
Circulation
Published
2005-05-10
Volume
111
Issue
18
Pages
2330-2338
ISSN
  • 0009-7322 (ISSN-L)
  • 1524-4539
OpenAlex
W2126800040
Cited by
74
References
38
Citations by year
2025: 1 · 2024: 1 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 4 · 2019: 4 · 2018: 4 · 2017: 2 · 2016: 3 · 2015: 5 · 2014: 2 · 2013: 4 · 2012: 5
FWCI
5.01
Type
journal article
Language
en
Open access
Locations
  • Circulation (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • American Heart Association
  • National Institutes of Health (5p50hl074728-05)
  • National Heart, Lung, and Blood Institute (P01HL069779, P50-HL074728, R01HL056370, P50HL052318)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiomyopathy and Myosin Studies
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Fibrosis and Remodeling
Keywords
hypertrophic cardiomyopathy, cardiac troponin I, transgenic rabbit model, familial hypertrophic cardiomyopathy, calcium handling, cardiac repolarization, detrended fluctuation analysis, sarcoplasmic reticulum calcium, perinatal lethality
MeSH terms
Animals, Calcium, Disease Models, Animal, Electrocardiography, Fibrosis, Cardiomegaly, Heart Function Tests, Heart Ventricles, Humans, Phenotype, Rabbits, Connexin 43, Transgenes, Troponin I, Mutation, Missense, Cardiomyopathy, Hypertrophic, Familial, Animals, Genetically Modified, Myocytes, Cardiac

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