The applicant's long-range goals are to define the biological roles and regulation of K channels in heart and skeletal muscle.
The specific aims of this proposal are: (1) To develop a transgenic mouse model deficient in the expression of cardiac voltage-gated K channels using a dominant negative approach by over-expression of a truncated K channel (Kv1.1N206). It is anticipated that such a transgenic mouse may be an appropriate animal model for the long QT interval syndrome. Included in this aim are description of the biochemical, biophysical and pharmacological properties of the K channels expressed in the hearts of transgenic mice, and monitoring of the heart rhythm for possible ventricular arrhythmias in transgenic mice. (2) To determine the individual amino acids that play a role in the dominant negative effect of Kv1.1N206 in vitro and in vivo. This includes determining the amino acids responsible for in vitro folding and assembly of Kv1.1N206 into multimeric complexes, and determining the amino acids which are responsible for the dominant negative effect in Xenopus oocytes. (3) Elucidation of the mechanisms that regulate cell-specificity and the level of expression of the gene coding for the K channel, Kv1.5. This includes studies of the cis- regulatory sequences and transacting nuclear factors that modulate the cell-specific expression of Kv1.5, and characterization of a DNA element (KPE) that regulates the level of expression of Kv1.5 promoter in GH3 cells.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL046005-08
Application #
2901142
Study Section
Cardiovascular and Pulmonary Research A Study Section (CVA)
Project Start
1991-08-08
Project End
2000-03-31
Budget Start
1999-04-01
Budget End
2000-03-31
Support Year
8
Fiscal Year
1999
Total Cost
Indirect Cost
Name
Brigham and Women's Hospital
Department
Type
DUNS #
071723621
City
Boston
State
MA
Country
United States
Zip Code
02115
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Kim, Tae Yun; Kunitomo, Yukiko; Pfeiffer, Zachary et al. (2015) Complex excitation dynamics underlie polymorphic ventricular tachycardia in a transgenic rabbit model of long QT syndrome type 1. Heart Rhythm 12:220-8
Terentyev, Dmitry; Rochira, Jennifer A; Terentyeva, Radmila et al. (2014) Sarcoplasmic reticulum Ca²? release is both necessary and sufficient for SK channel activation in ventricular myocytes. Am J Physiol Heart Circ Physiol 306:H738-46
Organ-Darling, Louise E; Vernon, Amanda N; Giovanniello, Jacqueline R et al. (2013) Interactions between hERG and KCNQ1 ?-subunits are mediated by their COOH termini and modulated by cAMP. Am J Physiol Heart Circ Physiol 304:H589-99
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Ziv, Ohad; Schofield, Lorraine; Lau, Emily et al. (2012) A novel, minimally invasive, segmental myocardial infarction with a clear healed infarct borderzone in rabbits. Am J Physiol Heart Circ Physiol 302:H2321-30
Jindal, Hitesh K; Merchant, Elisabeth; Balschi, James A et al. (2012) Proteomic analyses of transgenic LQT1 and LQT2 rabbit hearts elucidate an increase in expression and activity of energy producing enzymes. J Proteomics 75:5254-65
Odening, Katja E; Choi, Bum-Rak; Liu, Gong Xin et al. (2012) Estradiol promotes sudden cardiac death in transgenic long QT type 2 rabbits while progesterone is protective. Heart Rhythm 9:823-32
Cooper, Leroy L; Odening, Katja E; Hwang, Min-Sig et al. (2012) Electromechanical and structural alterations in the aging rabbit heart and aorta. Am J Physiol Heart Circ Physiol 302:H1625-35
Biermann, Jurgen; Wu, Kezhong; Odening, Katja E et al. (2011) Nicorandil normalizes prolonged repolarisation in the first transgenic rabbit model with Long-QT syndrome 1 both in vitro and in vivo. Eur J Pharmacol 650:309-16

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