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Classification of thyroid hormone receptor agonists and antagonists using statistical learning approaches. Mol Divers 2018; 23:85-92. [DOI: 10.1007/s11030-018-9857-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 07/09/2018] [Indexed: 02/06/2023]
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Peliciari-Garcia RA, Bargi-Souza P, Young ME, Nunes MT. Repercussions of hypo and hyperthyroidism on the heart circadian clock. Chronobiol Int 2017; 35:147-159. [PMID: 29111822 DOI: 10.1080/07420528.2017.1388253] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Myocardial gene expression and metabolism fluctuate over the course of the day in association with changes in energy supply and demand. Time-of-day-dependent oscillations in myocardial processes have been linked to the intrinsic cardiomyocyte circadian clock. Triiodothyronine (T3) is an important modulator of heart metabolism and function. Recently, our group has reported time-of-day-dependent rhythms in cardiac T3 sensitivity, as well as, T3-mediated acute alterations on core clock components. Hypo and hyperthyroidism are the second most prevalent endocrine disease worldwide. Considering the importance of the cardiomyocyte circadian clock and T3 to cardiac physiology, the aim of this study was to investigate the consequences of chronic hypo and hyperthyroidism on 24-h rhythms of circadian clock genes in the heart. Hypo and hyperthyroidism was induced in rats by thyroidectomy (Tx) and i.p. injections of supraphysiological dose of T3, respectively. Here we report alterations in mRNA levels of the major core clock components (Bmal1, Per2, Nr1d1, and Rora) for both experimental conditions (with the exception of Per2 during hyperthyroid condition). Oscillations in mRNA levels of key glucose and fatty-acid metabolism genes known to be clock controlled (Pdk4, Ucp3, Acot1, and Cd36) were equally affected by the experimental conditions, especially during the hypothyroid state. These findings suggest that chronic alterations in thyroid status significantly impacts 24-h rhythms in circadian clock and metabolic genes in the heart. Whether these perturbations contribute toward the pathogenesis of cardiac dysfunction associated with hypo and hyperthyroidism requires further elucidation.
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Affiliation(s)
- Rodrigo A Peliciari-Garcia
- a Morphophysiology & Pathology Sector, Department of Biological Sciences , Federal University of São Paulo , Diadema , Brazil.,b Department of Physiology and Biophysics , Institute of Biomedical Sciences-I, University of São Paulo , São Paulo , Brazil
| | - Paula Bargi-Souza
- b Department of Physiology and Biophysics , Institute of Biomedical Sciences-I, University of São Paulo , São Paulo , Brazil
| | - Martin E Young
- c Division of Cardiovascular Diseases, Department of Medicine , University of Alabama at Birmingham , Birmingham , AL , USA
| | - Maria Tereza Nunes
- b Department of Physiology and Biophysics , Institute of Biomedical Sciences-I, University of São Paulo , São Paulo , Brazil
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Risk factors for cardiovascular disease in subclinical hypothyroidism. Ir J Med Sci 2017; 187:39-43. [DOI: 10.1007/s11845-017-1617-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 04/04/2017] [Indexed: 01/07/2023]
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Peliciari-Garcia RA, Prévide RM, Nunes MT, Young ME. Interrelationship between 3,5,3´-triiodothyronine and the circadian clock in the rodent heart. Chronobiol Int 2016; 33:1444-1454. [PMID: 27661292 DOI: 10.1080/07420528.2016.1229673] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Triiodothyronine (T3) is an important modulator of cardiac metabolism and function, often through modulation of gene expression. The cardiomyocyte circadian clock is a transcriptionally based molecular mechanism capable of regulating cardiac processes, in part by modulating responsiveness of the heart to extra-cardiac stimuli/stresses in a time-of-day (TOD)-dependent manner. Although TOD-dependent oscillations in circulating levels of T3 (and its intermediates) have been established, oscillations in T3 sensitivity in the heart is unknown. To investigate the latter possibility, euthyroid male Wistar rats were treated with vehicle or T3 at distinct times of the day, after which induction of known T3 target genes were assessed in the heart (4-h later). The expression of mRNA was assessed by real-time quantitative polymerase chain reaction (qPCR). Here, we report greater T3 induction of transcript levels at the end of the dark phase. Surprisingly, use of cardiomyocyte-specific clock mutant (CCM) mice revealed that TOD-dependent oscillations in T3 sensitivity were independent of this cell autonomous mechanism. Investigation of genes encoding for proteins that affect T3 sensitivity revealed that Dio1, Dio2 and Thrb1 exhibited TOD-dependent variations in the heart, while Thra1 and Thra2 did not. Of these, Dio1 and Thrb1 were increased in the heart at the end of the dark phase. Interestingly, we observed that T3 acutely altered the expression of core clock components (e.g. Bmal1) in the rat heart. To investigate this further, rats were injected with a single dose of T3, after which expression of clock genes was interrogated at 3-h intervals over the subsequent 24-h period. These studies revealed robust effects of T3 on oscillations of both core clock components and clock-controlled genes. In summary, the current study exposed TOD-dependent sensitivity to T3 in the heart and its effects in the circadian clock genes expression.
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Affiliation(s)
- Rodrigo Antonio Peliciari-Garcia
- a Department of Biological Sciences , Federal University of São Paulo , Diadema.,b Institute of Biomedical Sciences-I, Department of Physiology and Biophysics , University of São Paulo , São Paulo , SP , Brazil
| | - Rafael Maso Prévide
- b Institute of Biomedical Sciences-I, Department of Physiology and Biophysics , University of São Paulo , São Paulo , SP , Brazil
| | - Maria Tereza Nunes
- b Institute of Biomedical Sciences-I, Department of Physiology and Biophysics , University of São Paulo , São Paulo , SP , Brazil
| | - Martin Elliot Young
- c Department of Medicine, Division of Cardiovascular Diseases , University of Alabama at Birmingham , Birmingham , AL , USA
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Patel M, Mishra V, Pawar V, Ranvir R, Sundar R, Dabhi R. Evaluation of acute physiological and molecular alterations in surgically developed hypothyroid Wistar rats. J Pharmacol Pharmacother 2013; 4:110-5. [PMID: 23759902 PMCID: PMC3669569 DOI: 10.4103/0976-500x.110891] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES To explore the general physiological and molecular changes occurring as a result of acute hypothyroidism. MATERIALS AND METHODS Hypothyroidism was developed by thyroidectomy in wistar rats. After surgery, animals were observed for 14 days in order to determine changes in body weight, feed consumption, rectal temperature, heart rate, and blood pressure, clinical pathological and hormonal alteration. In addition, relative changes in weight, histopathology and MHC - α and β gene expression of heart was also evaluated. RESULTS Thyroidectomised rats showed lethargy, piloerection and decreased locomotors activity. Day dependent significantly decreased body weight and feed consumption were seen in hypothyroid rats. Rectal temperature was significantly reduced at day 7 and 14 after surgery. Heart rate and blood pressure were significantly decreased at day 14 in thyroidectomized rats in comparison with euthyroid rats. Haematological parameters shown high WBC count. Serum LDL and phosphorous levels were high where as triglycerides; total protein, creatinine kinase and globulin were low. Heart weight was significantly high. Histopathology of heart tissue showed myocardial segmental degeneration. Downregulation of MHC - α and upregulation of MHC - β were seen in hypothyroid rats in comparison with euthyroid rats. CONCLUSION This finding suggests that deficiency of thyroid hormone (TH) in hypothyroidism is associated to a cardiac dysfunction and acute changes in body homoeostasis as result of sudden arrest of thyroid hormone.
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Affiliation(s)
- Maulik Patel
- Department of Pharmacology, A.R. College of Pharmacy, Vallabh Vidyanagar, Gujarat, India
| | - Vinay Mishra
- Department of Pharmacology and Toxicology, Zydus Research Center, Sarkhej-Bavla, Moraiya, Ahmedabad, Gujarat, India
| | - Vaibhavi Pawar
- Department of Pharmacology and Toxicology, Zydus Research Center, Sarkhej-Bavla, Moraiya, Ahmedabad, Gujarat, India
| | - Ramchandran Ranvir
- Department of Pharmacology and Toxicology, Zydus Research Center, Sarkhej-Bavla, Moraiya, Ahmedabad, Gujarat, India
| | - Rajesh Sundar
- Department of Pharmacology and Toxicology, Zydus Research Center, Sarkhej-Bavla, Moraiya, Ahmedabad, Gujarat, India
| | - Rajas Dabhi
- Department of Pharmacology, S.J. Thakkar Pharmacy College, Kalawad Road, Rajkot, Gujarat, India
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Vicinanza R, Coppotelli G, Malacrino C, Nardo T, Buchetti B, Lenti L, Celi FS, Scarpa S. Oxidized low-density lipoproteins impair endothelial function by inhibiting non-genomic action of thyroid hormone-mediated nitric oxide production in human endothelial cells. Thyroid 2013; 23:231-8. [PMID: 23072587 PMCID: PMC3569959 DOI: 10.1089/thy.2011.0524] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND Thyroid hormone (TH) plays an important role in the modulation of cardiac function, including contractility and systemic vascular resistance (SVR). 3,5,3'-triiodothyronine (T(3)), the active form of TH, induces the activation of endothelial nitric oxide synthase via PI3K/AKT non-genomic signaling. Hypothyroidism is associated with an increase in SVR and serum low-density lipoproteins (LDL) levels, and accumulation of oxidized LDL (oxLDL) may impair endothelial-dependent vascular relaxation. The aim of this study was to investigate the effects of both native LDL (nLDL) and oxLDL on T(3)-mediated AKT phosphorylation, nitric oxide (NO), and cyclic guanosine monophosphate (cGMP) production in human endothelial cells. METHODS Human umbilical vein endothelial cells were exposed to either nLDL or oxLDL for 3 hours and then stimulated with T(3) (10(-7) M) or pretreated with an antioxidant mixture of vitamins E and C for 12 hours before treatment with LDL. An analysis of AKT phosphorylation was performed by Western blot, and NO production was evaluated by using 4,5-diaminofluorescein diacetate. Intracellular production of cGMP was measured by enzymatic immunoassay. LDL oxidation was carried out by incubating LDL with CuSO(4), and α-tocopherol content of LDL was evaluated by high-performance liquid chromatography. RESULTS OxLDL impaired T(3)-mediated AKT phosphorylation at serine 473 and significantly decreased the production of both NO (oxLDL+T(3) vs. T(3), 9.79±0.5 AU vs. 80.75±2.8 AU, mean±standard deviation, p<0.0001) and cGMP. Furthermore, pretreatment with the antioxidant mixture obviated the inhibitory effect of LDL on T(3) action. CONCLUSIONS The results of this study demonstrate that oxLDL may contribute to a blunting of the non-genomic action of T(3) and impair the effect of T(3) on NO and cGMP production in endothelial cells. These data suggest that oxLDL, apart from inducing the atherosclerotic process, may also promote a mechanism of peripheral resistance to T(3,) further amplifying the impact of hypothyroidism on endothelial function by increasing SVR.
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Affiliation(s)
- Roberto Vicinanza
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy.
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Wang X, Sun Z. Thyroid hormone induces artery smooth muscle cell proliferation: discovery of a new TRalpha1-Nox1 pathway. J Cell Mol Med 2011; 14:368-80. [PMID: 20414976 PMCID: PMC2888973 DOI: 10.1111/j.1582-4934.2008.00489.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Thyroid hormone (T3) can stimulate protein synthesis and cell growth. NOX1 is a mitogenic oxidase. The aim of this study was to test a novel hypothesis that T3 induces artery smooth muscle cell proliferation by up-regulating NOX1. Immunofluoresence confocal microscopy was used to visualize the sub-cellular localization of NOX1 and TRα1 in rat aorta smooth muscle (RASM) cells. Optical sectioning showed that TRα1 and NOX1 co-localized around the nucleus. T3 promoted RASM cell proliferation as determined by the fact that T3 significantly increased the number of cytokinesis cells, proliferating cellular nuclear antigen (PCNA) and smooth muscle α-actin (SM α-actin). T3 increased NOX1 expression at both the transcription (mRNA) and translation (protein) levels as evaluated by RT-PCR and Western blot, respectively. T3 also significantly increased the intracellular ROS production based on the oxidation of 2’,7’-dichlorodihydrofluoresein (H2DCF) to a fluorescent 2’,7’-dichlorofluoresein (DCF). RNAi silence of TRα1 or NOX1 abolished T3-induced intracellular ROS generation and PCNA and SM α-actin expression, indicating that TRα1 and NOX1 mediated T3-induced RASM cell proliferation. Notably, RNAi silence of TRα1 blocked the T3-induced increase in NOX1 expression, whereas silence of NOX1 did not affect TRα1 expression, disclosing a new pathway, i.e. T3-TRα1-NOX1-cell proliferation. TRα1 and NOX1 co-localized around the nucleus. T3 induced RASM cell proliferation by up-regulating NOX1 in a TRα1-dependent manner.
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Affiliation(s)
- Xiuqing Wang
- Department of Physiology, College of Medicine, University of Oklahoma Health Sciences Center (OUHSC), Oklahoma City, OK, USA
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Abstract
The patent application WO2008106213 describes the beneficial effects of thyroid hormone analogue 3,5 diiodothyropropionic acid (DITPA) such as stimulating weight loss in overweight mammals, lowering of triglyceride and treating metabolic syndrome in humans. The human population of the patients selected in the studies mentioned has a body mass index > 25. Two examples of the human clinical studies employing DITPA have been mentioned, namely, the body weight reduction and improvement in metabolic abnormalities in obese adults.
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Affiliation(s)
- Saurin Raval
- Zydus Research Centre, Department of Medicinal Chemistry, Moraiya, Ahmedabad, India.
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Bleicher L, Aparicio R, Nunes FM, Martinez L, Gomes Dias SM, Figueira ACM, Santos MAM, Venturelli WH, da Silva R, Donate PM, Neves FA, Simeoni LA, Baxter JD, Webb P, Skaf MS, Polikarpov I. Structural basis of GC-1 selectivity for thyroid hormone receptor isoforms. BMC STRUCTURAL BIOLOGY 2008; 8:8. [PMID: 18237438 PMCID: PMC2275733 DOI: 10.1186/1472-6807-8-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2007] [Accepted: 01/31/2008] [Indexed: 12/14/2022]
Abstract
Background Thyroid receptors, TRα and TRβ, are involved in important physiological functions such as metabolism, cholesterol level and heart activities. Whereas metabolism increase and cholesterol level lowering could be achieved by TRβ isoform activation, TRα activation affects heart rates. Therefore, β-selective thyromimetics have been developed as promising drug-candidates for treatment of obesity and elevated cholesterol level. GC-1 [3,5-dimethyl-4-(4'-hydroxy-3'-isopropylbenzyl)-phenoxy acetic acid] has ability to lower LDL cholesterol with 600- to 1400-fold more potency and approximately two- to threefold more efficacy than atorvastatin (Lipitor©) in studies in rats, mice and monkeys. Results To investigate GC-1 specificity, we solved crystal structures and performed molecular dynamics simulations of both isoforms complexed with GC-1. Crystal structures reveal that, in TRα Arg228 is observed in multiple conformations, an effect triggered by the differences in the interactions between GC-1 and Ser277 or the corresponding asparagine (Asn331) of TRβ. The corresponding Arg282 of TRβ is observed in only one single stable conformation, interacting effectively with the ligand. Molecular dynamics support this model: our simulations show that the multiple conformations can be observed for the Arg228 in TRα, in which the ligand interacts either strongly with the ligand or with the Ser277 residue. In contrast, a single stable Arg282 conformation is observed for TRβ, in which it strongly interacts with both GC-1 and the Asn331. Conclusion Our analysis suggests that the key factors for GC-1 selectivity are the presence of an oxyacetic acid ester oxygen and the absence of the amino group relative to T3. These results shed light into the β-selectivity of GC-1 and may assist the development of new compounds with potential as drug candidates to the treatment of hypercholesterolemia and obesity.
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Affiliation(s)
- Lucas Bleicher
- Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São Carlense, 400 CEP 13560-970 São Carlos, SP, Brazil.
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Abstract
The heart is a major target organ for thyroid hormone action, and marked changes occur in cardiac function in patients with hypo- or hyperthyroidism. T(3)-induced changes in cardiac function can result from direct or indirect T(3) effects. Direct effects result from T(3) action in the heart itself and are mediated by nuclear or extranuclear mechanisms. Extranuclear T(3) effects, which occur independent of nuclear T(3) receptor binding and increases in protein synthesis, influence primarily the transport of amino acids, sugars, and calcium across the cell membrane. Nuclear T(3) effects are mediated by the binding of T(3) to specific nuclear receptor proteins, which results in increased transcription of T(3)-responsive cardiac genes. The T(3) receptor is a member of the ligand-activated transcription factor family and is encoded by cellular erythroblastosis A (c-erb A) genes. T(3) also leads to an increase in the speed of diastolic relaxation, which is caused by the more efficient pumping of the calcium ATPase of the sarcoplasmic reticulum. This T(3) effect results from T(3)-induced increases in the level of the mRNA coding for the sarcoplasmic reticulum calcium ATPase protein, leading to an increased number of calcium ATPase pump units in the sarcoplasmic reticulum.
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Affiliation(s)
- George J Kahaly
- Departmrent of Medicine I, Endocrine Unit, Gutenberg-University Hospital, D-55101 Mainz, Germany
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Webb P, Nguyen NH, Chiellini G, Yoshihara HAI, Cunha Lima ST, Apriletti JW, Ribeiro RCJ, Marimuthu A, West BL, Goede P, Mellstrom K, Nilsson S, Kushner PJ, Fletterick RJ, Scanlan TS, Baxter JD. Design of thyroid hormone receptor antagonists from first principles. J Steroid Biochem Mol Biol 2002; 83:59-73. [PMID: 12650702 DOI: 10.1016/s0960-0760(02)00270-4] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
It is desirable to obtain TR antagonists for treatment of hyperthyroidism and other conditions. We have designed TR antagonists from first principles based on TR crystal structures. Since agonist ligands are buried in the fold of the TR ligand binding domain (LBD), we reasoned that ligands that resemble agonists with large extensions should bind the LBD, but would prevent its folding into an active conformation. In particular, we predicted that extensions at the 5' aryl position of ligand should reposition helix (H) 12, which forms part of the co-activator binding surface, and thereby inhibit TR activity. We have found that some synthetic ligands with 5' aryl ring extensions behave as antagonists (DIBRT, NH-3), or partial antagonists (GC-14, NH-4). Moreover, one compound (NH-3) represents the first potent TR antagonist with nanomolar affinity that also inhibits TR action in an animal model. However, the properties of the ligands also reveal unexpected aspects of TR behavior. While nuclear receptor antagonists generally promote binding of co-repressors, NH-3 blocks co-activator binding and also prevents co-repressor binding. More surprisingly, many compounds with extensions behave as full or partial agonists. We present hypotheses to explain both behaviors in terms of dynamic equilibrium of H12 position.
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Affiliation(s)
- Paul Webb
- Diabetes Center and Metabolic Research Unit, University of California, San Francisco, CA 94143, USA.
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Abstract
Thyroid hormones (THs) play critical roles in the differentiation, growth, metabolism, and physiological function of virtually all tissues. TH binds to receptors that are ligand-regulatable transcription factors belonging to the nuclear hormone receptor superfamily. Tremendous progress has been made recently in our understanding of the molecular mechanisms that underlie TH action. In this review, we present the major advances in our knowledge of the molecular mechanisms of TH action and their implications for TH action in specific tissues, resistance to thyroid hormone syndrome, and genetically engineered mouse models.
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Affiliation(s)
- P M Yen
- Molecular Regulation and Neuroendocrinology Section, Clinical Endocrinology Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
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Gloss B, Sayen MR, Trost SU, Bluhm WF, Meyer M, Swanson EA, Usala SJ, Dillmann WH. Altered cardiac phenotype in transgenic mice carrying the delta337 threonine thyroid hormone receptor beta mutant derived from the S family. Endocrinology 1999; 140:897-902. [PMID: 9927321 DOI: 10.1210/endo.140.2.6527] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The heart has been recognized as a major target of thyroid hormone action. Our study investigates both the regulation of cardiac-specific genes and contractile behavior of the heart in the presence of a mutant thyroid hormone receptor beta1 (T3Rbeta1-delta337T) derived from the S kindred. The mutant receptor was originally identified in a patient with generalized resistance to thyroid hormone. Cardiac expression of the mutant receptor was achieved by a transgenic approach in mice. As the genes for myosin heavy chains (MHC alpha and MHC beta) and the cardiac sarcoplasmic reticulum Ca2+ adenosine triphosphatase (SERCA2) are known to be regulated by T3, their cardiac expression was analyzed. The messenger RNA levels for MHC alpha and SERCA2 were markedly down-regulated, MHC beta messenger RNA was up-regulated. Although T3 levels were normal in these animals, this pattern of cardiac gene expression mimics a hypothyroid phenotype. Cardiac muscle contraction was significantly prolonged in papillary muscles from transgenic mice. The electrocardiogram of transgenic mice showed a substantial prolongation of the QRS interval. Changes in cardiac gene expression, cardiac muscle contractility, and electrocardiogram are compatible with a hypothyroid cardiac phenotype despite normal T3 levels, indicating a dominant negative effect of the T3Rbeta mutant.
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Affiliation(s)
- B Gloss
- Department of Medicine, University of California-San Diego, La Jolla 92093-0618, USA
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