We are analyzing https://link.springer.com/article/10.1007/s00395-010-0149-5.

Title:
Molecular characterization of thyroid hormone-inhibited atrial L-type calcium channel expression: implication for atrial fibrillation in hyperthyroidism | Basic Research in Cardiology
Description:
Atrial fibrillation (AF) is a common complication in hyperthyroidism. Earlier studies demonstrate that thyroid hormone decreases L-type calcium channel (LCC) current expression with resultant shortening of action potential duration (APD), providing a substrate for AF. The aim of this study was to investigate the potential mechanism underlying the regulatory effect of thyroid hormone on LCC. In a hyperthyroid rat model, thyroid hormone (triiodothyronine [T3]) administration down-regulated atrial LCC expression. In vitro, treatment of murine atrial myocytes (HL-1) with T3 decreased the expression of LCC and its current, resulting in abbreviation of APD. Furthermore, T3 inhibited the activation of cyclic AMP response element (CRE)-binding protein (CREB), including phosphorylation at Ser133 and its nuclear translocation. Transient transfection studies in HL-1 cells indicated that T3 reduced LCC promoter activity. Deletion and mutation analysis of the LCC promoter region along with chromatin immunoprecipitation using anti-CREB antibody showed that CRE was essential for T3-mediated LCC gene expression. Transfection of dominant-negative CREB (mutated Ser133) and mutant thyroid hormone receptor (TR, mutated Cys51) abolished the T3-dependent effects, suggesting an association between both transcriptional factors. Co-immunoprecipitation documented an increased binding of TR with CREB after T3 treatment. The transcriptional cross-talk 3 between TR and CREB bound to CRE mediates T3-inhibited CREB activity and LCC expression. Thyroid hormone-induced TR binding of CREB inhibits CREB activity and LCC current expression, which may contribute to AF. These findings provide an important mechanistic insight into hyperthyroidism-induced AF.
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Keywords {🔍}

article, google, scholar, pubmed, cas, thyroid, atrial, chen, fibrillation, hormone, expression, res, lin, chang, creb, lcc, receptor, remodeling, basic, access, cell, cardiol, research, calcium, yeh, channels, dois, nattel, privacy, cookies, content, molecular, ltype, hyperthyroidism, action, potential, gung, author, information, publish, search, channel, current, mechanism, underlying, activity, open, factor, rev, circ,

Topics {✒️}

akt/gsk-3β/mtor signaling pathway ion channels kwang-huei lin l-type calcium channel l-type calcium current cell signal 16 month download article/chapter camp-response element modulator long-standing atrial fibrillation author information authors platelet-derived growth factor binding protein atrial-ventricular remodeling differences transient transfection studies author correspondence anti-creb antibody showed article basic research cameiro-ramos ms chang gung university human atrial fibrillation paroxysmal atrial fibrillation atrial fibrillation 50 years nuclear receptor trα1 nuclear receptor monomers thyroid hormone t3 yung-hsin yeh thyroid hormone action thyroid hormone receptors potential mechanism underlying cardiovascular system action potential duration wei-jan chen related subjects fu-shin road full article pdf promotes vsmc differentiation human cardiac isoform 1007/s00395-009-0045 privacy choices/manage cookies anaplastic thyroid carcinoma check access instant access atrial electrical remodeling murine atrial myocytes atrial fibrillation chang ms t3-dependent effects t3 inhibited thyroid hormone lcc promoter region

Questions {❓}

Johannessen M, Delghandi MP, Moens U (2004) What turns CREB on?
Maia AL, Harney JW, Larsen PR (1996) Is there a negative TRE in the luciferase reporter cDNA?

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         headline:Molecular characterization of thyroid hormone-inhibited atrial L-type calcium channel expression: implication for atrial fibrillation in hyperthyroidism
         description:Atrial fibrillation (AF) is a common complication in hyperthyroidism. Earlier studies demonstrate that thyroid hormone decreases L-type calcium channel (LCC) current expression with resultant shortening of action potential duration (APD), providing a substrate for AF. The aim of this study was to investigate the potential mechanism underlying the regulatory effect of thyroid hormone on LCC. In a hyperthyroid rat model, thyroid hormone (triiodothyronine [T3]) administration down-regulated atrial LCC expression. In vitro, treatment of murine atrial myocytes (HL-1) with T3 decreased the expression of LCC and its current, resulting in abbreviation of APD. Furthermore, T3 inhibited the activation of cyclic AMP response element (CRE)-binding protein (CREB), including phosphorylation at Ser133 and its nuclear translocation. Transient transfection studies in HL-1 cells indicated that T3 reduced LCC promoter activity. Deletion and mutation analysis of the LCC promoter region along with chromatin immunoprecipitation using anti-CREB antibody showed that CRE was essential for T3-mediated LCC gene expression. Transfection of dominant-negative CREB (mutated Ser133) and mutant thyroid hormone receptor (TR, mutated Cys51) abolished the T3-dependent effects, suggesting an association between both transcriptional factors. Co-immunoprecipitation documented an increased binding of TR with CREB after T3 treatment. The transcriptional cross-talk 3 between TR and CREB bound to CRE mediates T3-inhibited CREB activity and LCC expression. Thyroid hormone-induced TR binding of CREB inhibits CREB activity and LCC current expression, which may contribute to AF. These findings provide an important mechanistic insight into hyperthyroidism-induced AF.
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      description:Atrial fibrillation (AF) is a common complication in hyperthyroidism. Earlier studies demonstrate that thyroid hormone decreases L-type calcium channel (LCC) current expression with resultant shortening of action potential duration (APD), providing a substrate for AF. The aim of this study was to investigate the potential mechanism underlying the regulatory effect of thyroid hormone on LCC. In a hyperthyroid rat model, thyroid hormone (triiodothyronine [T3]) administration down-regulated atrial LCC expression. In vitro, treatment of murine atrial myocytes (HL-1) with T3 decreased the expression of LCC and its current, resulting in abbreviation of APD. Furthermore, T3 inhibited the activation of cyclic AMP response element (CRE)-binding protein (CREB), including phosphorylation at Ser133 and its nuclear translocation. Transient transfection studies in HL-1 cells indicated that T3 reduced LCC promoter activity. Deletion and mutation analysis of the LCC promoter region along with chromatin immunoprecipitation using anti-CREB antibody showed that CRE was essential for T3-mediated LCC gene expression. Transfection of dominant-negative CREB (mutated Ser133) and mutant thyroid hormone receptor (TR, mutated Cys51) abolished the T3-dependent effects, suggesting an association between both transcriptional factors. Co-immunoprecipitation documented an increased binding of TR with CREB after T3 treatment. The transcriptional cross-talk 3 between TR and CREB bound to CRE mediates T3-inhibited CREB activity and LCC expression. Thyroid hormone-induced TR binding of CREB inhibits CREB activity and LCC current expression, which may contribute to AF. These findings provide an important mechanistic insight into hyperthyroidism-induced AF.
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