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Selivanova EK, Gaynullina DK, Tarasova OS. Thyroxine Induces Acute Relaxation of Rat Skeletal Muscle Arteries via Integrin αvβ3, ERK1/2 and Integrin-Linked Kinase. Front Physiol 2021; 12:726354. [PMID: 34594239 PMCID: PMC8477044 DOI: 10.3389/fphys.2021.726354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 08/23/2021] [Indexed: 11/17/2022] Open
Abstract
Aim: Hyperthyroidism is associated with a decreased peripheral vascular resistance, which could be caused by the vasodilator genomic or non-genomic effects of thyroid hormones (TH). Non-genomic, or acute, effects develop within several minutes and involve a wide tissue-specific spectrum of molecular pathways poorly studied in vasculature. We aimed to investigate the mechanisms of acute effects of TH on rat skeletal muscle arteries. Methods: Sural arteries from male Wistar rats were used for isometric force recording (wire myography) and phosphorylated protein content measurement (Western blotting). Results: Both triiodothyronine (T3) and thyroxine (T4) reduced contractile response of sural arteries to α1-adrenoceptor agonist methoxamine. The effect of T4 was more prominent than T3 and not affected by iopanoic acid, an inhibitor of deiodinase 2. Endothelium denudation abolished the effect of T3, but not T4. Integrin αvβ3 inhibitor tetrac abolished the effect of T4 in endothelium-denuded arteries. T4 weakened methoxamine-induced elevation of phospho-MLC2 (Ser19) content in arterial samples. The effect of T4 in endothelium-denuded arteries was abolished by inhibiting ERK1/2 activation with U0126 as well as by ILK inhibitor Cpd22 but persisted in the presence of Src- or Rho-kinase inhibitors (PP2 and Y27632, respectively). Conclusion: Acute non-genomic relaxation of sural arteries induced by T3 is endothelium-dependent and that induced by T4 is endothelium-independent. The effect of T4 on α1-adrenergic contraction is stronger compared to T3 and involves the suppression of extracellular matrix signaling via integrin αvβ3, ERK1/2 and ILK with subsequent decrease of MLC2 (Ser19) phosphorylation.
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Affiliation(s)
- Ekaterina K Selivanova
- Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Dina K Gaynullina
- Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia.,Department of Physiology, Pirogov Russian National Research Medical University, Moscow, Russia
| | - Olga S Tarasova
- Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia.,Laboratory of Exercise Physiology, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
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Cros-Brunsó L, Camacho-Rodríguez L, Martínez-González Á, Llévenes P, Salaices M, García-Redondo AB, Blanco-Rivero J. A Blunted Sympathetic Function and an Enhanced Nitrergic Activity Contribute to Reduce Mesenteric Resistance in Hyperthyroidism. Int J Mol Sci 2021; 22:ijms22020570. [PMID: 33430047 PMCID: PMC7826714 DOI: 10.3390/ijms22020570] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 12/30/2020] [Accepted: 01/04/2021] [Indexed: 12/17/2022] Open
Abstract
We aimed to determine whether an experimental model of hyperthyroidism could alter the function of sympathetic and nitrergic components of mesenteric innervation. For this purpose, male Wistar rats were divided into (1) control rats (CT) and (2) rats infused with L-Thyroxine (HT). Body weight gain and adipose tissue accumulation were lower in HT rats, while systolic blood pressure and citrate synthase activity in the soleus muscle were increased by HT. In segments from the superior mesenteric artery, the application of an electrical field stimulation (EFS) induced a vasoconstrictor response, which was lower in arteries from HT animals. The alpha-adrenoceptor antagonist phentolamine diminished EFS-induced vasoconstriction to a lower extent in HT arteries, while the purinergic receptor antagonist suramin reduced contractile response to EFS only in segments from CT. In line with this, noradrenaline release, tyrosine hydroxylase expression and activation and dopamine β hydroxylase expression were diminished in HT. The unspecific nitric oxide synthase (NOS) inhibitor L-NAME increased EFS-induced vasoconstriction more markedly in segments from HT rats. NO release was enhanced in HT, probably due to an enhancement in neuronal NOS activity, in which a hyperactivation of both PKC and PI3K-AKT signaling pathways might play a relevant role. In conclusion, perivascular mesenteric innervation might contribute to reduce the vascular resistance observed in hyperthyroidism.
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Affiliation(s)
- Laia Cros-Brunsó
- Department of Physiology, School of Medicine, Universidad Autónoma de Madrid, Calle de Arzobispo Morcillo 4, 28029 Madrid, Spain; (L.C.-B.); (L.C.-R.); (Á.M.-G.); (P.L.)
| | - Laura Camacho-Rodríguez
- Department of Physiology, School of Medicine, Universidad Autónoma de Madrid, Calle de Arzobispo Morcillo 4, 28029 Madrid, Spain; (L.C.-B.); (L.C.-R.); (Á.M.-G.); (P.L.)
| | - Ángel Martínez-González
- Department of Physiology, School of Medicine, Universidad Autónoma de Madrid, Calle de Arzobispo Morcillo 4, 28029 Madrid, Spain; (L.C.-B.); (L.C.-R.); (Á.M.-G.); (P.L.)
| | - Pablo Llévenes
- Department of Physiology, School of Medicine, Universidad Autónoma de Madrid, Calle de Arzobispo Morcillo 4, 28029 Madrid, Spain; (L.C.-B.); (L.C.-R.); (Á.M.-G.); (P.L.)
| | - Mercedes Salaices
- Department of Pharmacology and Therapeutics, School of Medicine, Universidad Autónoma de Madrid, Calle de Arzobispo Morcillo 4, 28029 Madrid, Spain;
- Research Institute University Hospital la Paz (IdIPaz), Calle de Pedro Rico 6, 28029 Madrid, Spain
- Center for Biomedical Research Network in Cardiovascular Diseases (CIBERCV), Calle de Melchor Fernández Almagro 3, 28029 Madrid, Spain
| | - Ana Belen García-Redondo
- Department of Physiology, School of Medicine, Universidad Autónoma de Madrid, Calle de Arzobispo Morcillo 4, 28029 Madrid, Spain; (L.C.-B.); (L.C.-R.); (Á.M.-G.); (P.L.)
- Research Institute University Hospital la Paz (IdIPaz), Calle de Pedro Rico 6, 28029 Madrid, Spain
- Center for Biomedical Research Network in Cardiovascular Diseases (CIBERCV), Calle de Melchor Fernández Almagro 3, 28029 Madrid, Spain
- Correspondence: (A.B.G.-R.); (J.B.-R.); Tel.: +34-91-497-5446 (A.B.G.-R. & J.B.-R.)
| | - Javier Blanco-Rivero
- Department of Physiology, School of Medicine, Universidad Autónoma de Madrid, Calle de Arzobispo Morcillo 4, 28029 Madrid, Spain; (L.C.-B.); (L.C.-R.); (Á.M.-G.); (P.L.)
- Research Institute University Hospital la Paz (IdIPaz), Calle de Pedro Rico 6, 28029 Madrid, Spain
- Center for Biomedical Research Network in Cardiovascular Diseases (CIBERCV), Calle de Melchor Fernández Almagro 3, 28029 Madrid, Spain
- Correspondence: (A.B.G.-R.); (J.B.-R.); Tel.: +34-91-497-5446 (A.B.G.-R. & J.B.-R.)
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Llévenes P, Balfagón G, Blanco-Rivero J. Thyroid hormones affect nitrergic innervation function in rat mesenteric artery: Role of the PI3K/AKT pathway. Vascul Pharmacol 2018; 108:36-45. [PMID: 29751093 DOI: 10.1016/j.vph.2018.05.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 03/20/2018] [Accepted: 05/06/2018] [Indexed: 01/30/2023]
Abstract
We aimed to determine the influence of nitrergic innervation function on the decreased mesenteric arterial tone induced by high levels of triiodothyronine (T3), as a model of acute thyroiditis, as well as the mechanism/s implicated. We analysed in mesenteric segments from male Wistar rats the effect of 10 nmol/L T3 (2 h) on the vasomotor response to electrical field stimulation (EFS) in the presence/absence of specific neuronal NOS (nNOS) inhibitor L-NPA, or superoxide anion scavenger tempol. Nitric oxide (NO) release was measured in the presence/absence of tempol or PI3K inhibitor LY294002. Superoxide anion and peroxynitrite releases, nNOS, PI3K, AKT and superoxide dismutase (SOD) 1 and 2 expressions, nNOS and AKT phosphorylation, and SOD activity were analysed. T3 decreased EFS-induced vasoconstriction. L-NPA increased EFS-induced vasoconstriction more markedly in T3-incubated segments. T3 increased NO release. Tempol decreased EFS-induced vasoconstriction and augmented NO release only in segments without T3. LY294002 decreased NO release in T3-incubated segments. T3 diminished superoxide anion and peroxynitrite formation, enhanced SOD-2 expression, nNOS and AKT phosphorylations and SOD activity, and did not modify nNOS, PI3K, AKT and SOD-1 expressions. In conclusion, these results show a compensatory mechanism aimed at reducing the enhanced blood pressure that appears during acute thyroiditis.
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Affiliation(s)
- Pablo Llévenes
- Departamento de Fisiología, Facultad de Medicina, Universidad Autónoma de Madrid, Spain
| | - Gloria Balfagón
- Departamento de Fisiología, Facultad de Medicina, Universidad Autónoma de Madrid, Spain; Instituto de Investigación Hospital Universitario La Paz (IdIPaz), Spain
| | - Javier Blanco-Rivero
- Departamento de Fisiología, Facultad de Medicina, Universidad Autónoma de Madrid, Spain; Instituto de Investigación Hospital Universitario La Paz (IdIPaz), Spain.
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Janssen ST, Janssen OE. Directional thyroid hormone distribution via the blood stream to target sites. Mol Cell Endocrinol 2017; 458:16-21. [PMID: 28257828 DOI: 10.1016/j.mce.2017.02.037] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 02/23/2017] [Accepted: 02/23/2017] [Indexed: 12/19/2022]
Abstract
Thyroid hormones are bound to three major serum transport proteins, thyroxin-binding globulin (TBG), transthyretin (TTR) and human serum albumin (HSA). TBG has the strongest affinity for thyroid hormones, TTR is also found in the cerebrospinal fluid and HSA is the most abundant protein in plasma. Combination defects of either a high affinity TTR or HSA variant do not compensate TBG deficiency, underscoring the dominant role of TBG among the thyroid hormone transport proteins. On the other hand, coexistence of raised affinity TTR and HSA variants causes an augmented hyperthyroxinemia. Variations in thyroid hormone transport proteins may alter thyroid function tests to mimic hypo- or hyperthyroidism. As affected individuals are clinically euthyroid and do not require treatment, identification of thyroid hormone transport protein defects is important to avoid unnecessary diagnostic and therapeutic interventions. Mammals share the multilayered system of thyroid hormone binding proteins with humans. Some of them, especially carnivores, do not express TBG. In dogs, this defect has been shown to be caused by a defective hepatocyte nuclear factor-1 binding site in the TBG promoter, preventing TBG synthesis in the liver. The major endogenous thyroid hormone metabolite 3-iodothyronamine (3-T1AM) exerts marked cryogenic, metabolic, cardiac and central nervous system actions. It is bound to apolipoproteinB-100 (ApoB100), possibly facilitating its cellular uptake via interaction with the low density lipoprotein-receptor. This review summarizes the handling of hydrophobic charged thyroid hormone signaling molecules and their metabolite 3-T1AM in aqueous body fluids and the advantages and limits of their serum distributor proteins.
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Affiliation(s)
- Susanne T Janssen
- Institute of Laboratory Medicine, AescuLabor Hamburg, Hamburg, Germany
| | - Onno E Janssen
- Department of Internal Medicine, Endokrinologikum Hamburg, Hamburg, Germany.
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Duntas LH. Predictions on the Role of Thyronamines in the Setting of The Oracle of Delphi. Thyroid 2016; 26:1653-1655. [PMID: 27852155 DOI: 10.1089/thy.2016.0560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Leonidas H Duntas
- Unit of Endocrinology, Diabetes and Metabolism, Evgenideion Hospital, University of Athens , Athens, Greece
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Mittnacht J, Choukair D, Kneppo C, Brunner R, Parzer P, Gorenflo M, Bettendorf M. Long-Term Neurodevelopmental Outcome of Children Treated with Tri-Iodothyronine after Cardiac Surgery: Follow-Up of a Double-Blind, Randomized, Placebo-Controlled Study. Horm Res Paediatr 2016; 84:130-6. [PMID: 25967124 DOI: 10.1159/000381711] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 03/16/2015] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Transient thyroid dysfunction occurs in children after cardiopulmonary bypass (CPB). We demonstrated significant benefits of acute postoperative tri-iodothyronine (T3) treatment for recovery and myocardial function. Now we report the long-term neurodevelopment of these children. METHODS Twenty-eight children (70% of the original study population) could be recruited for a follow-up examination (median age 10.7 years, range 10-19.6 years) retaining the double-blind, randomized, placebo-controlled protocol. Cognitive function and motor development were tested, as were growth and thyroid and cardiac functions. RESULTS The median full-scale intelligence quotient of all children was within the reference range and similar in the placebo and T3 groups. Tests for motor and cognitive functions, growth, and thyroid and cardiac functions revealed concurrent results. CONCLUSIONS Overall intellectual development is preserved in adolescents treated with CPB in infancy irrespectively of low postoperative thyroid hormone concentrations. While acute postoperative T3 treatment in children after CPB improves recovery, no significant long-term effects on neurodevelopment could be detected. We therefore speculate that transient postoperative thyroid dysfunction by means of nonthyroidal illness syndrome is predominantly mediated by extranuclear, nongenomic mechanisms and thus acutely affects the cardiovascular system but not the development of the central nervous system mediated by genomic mechanisms.
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Affiliation(s)
- Janna Mittnacht
- Division of Paediatric Endocrinology and Diabetes, Department of Paediatrics, University Hospital Heidelberg, Heidelberg, Germany
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Shin YW, Choi YM, Kim HS, Kim DJ, Jo HJ, O'Donnell BF, Jang EK, Kim TY, Shong YK, Hong JP, Kim WB. Diminished Quality of Life and Increased Brain Functional Connectivity in Patients with Hypothyroidism After Total Thyroidectomy. Thyroid 2016; 26:641-9. [PMID: 26976233 PMCID: PMC4939446 DOI: 10.1089/thy.2015.0452] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Acute hypothyroidism induced by thyroid hormone withdrawal (THW) in patients with thyroid cancer after total thyroidectomy can affect mood and quality of life (QoL). While loss or dysregulation of thyroid hormone (TH) has these well-known behavioral consequences, the effects of TH alterations on brain function are not well understood. Resting state functional connectivity (FC) measured by functional magnetic resonance imaging (fMRI) allows non-invasive evaluation of human brain function. This study therefore examined whether THW affects resting state FC and whether changes in FC correlate with the mood or QoL of the patients with THW status. METHODS Twenty-one patients who had undergone total thyroidectomy for thyroid cancer were recruited. Resting state fMRI scanning of the brain, thyroid function tests, and administration of the 12-Item Short Form Health Survey (SF-12) and the Patient Health Questionnaire-9 (PHQ-9) were performed before and after two weeks of THW. Regional homogeneity (ReHo), one of the measures of resting state FC, was calculated, and each voxel was compared between before and after THW in 19 patients. The ReHo values were extracted from the regions of interest showing within-group differences in ReHo values after THW, and correlations of ReHo values with thyrotropin (TSH) levels, total score of the PHQ-9, and composite scores of the SF-12 were statistically evaluated. RESULTS Higher ReHo was observed after THW in the brain cortical regions across primary motor and sensory, visual, and association cortices. Among the regions, the ReHo values in the bilateral pre- and postcentral gyri, bilateral middle occipito-temporal cortices, the left precuneus, and the left lingual gyrus showed positive correlations with serum TSH levels after THW. Higher ReHo values in the bilateral pre- and postcentral gyri, the left middle temporo-occipital cortices, and the left ligual gyrus correlated with the lower mental component summary score from the SF-12, while higher ReHo values in the bilateral pre- and postcentral gyri correlated with higher total scores in the PHQ-9. CONCLUSIONS Local brain FC is increased in the acute hypothyroid state. Higher FC correlates with a poorer mental QoL and increased depression in the hypothyroid state.
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Affiliation(s)
- Yong-Wook Shin
- Department of Psychiatry, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Yun Mi Choi
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Ho Sung Kim
- Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Dae-Jin Kim
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana
| | - Hang Joon Jo
- Scientific and Statistical Computing Core, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland
| | - Brian F. O'Donnell
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana
| | - Eun Kyung Jang
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Tae Yong Kim
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Young Kee Shong
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Jin Pyo Hong
- Department of Psychiatry, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Won Bae Kim
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
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Abstract
Cardiac remodeling includes alterations in molecular, cellular, and interstitial systems contributing to changes in size, shape, and function of the heart. This may be the result of injury, alterations in hemodynamic load, neurohormonal effects, electrical abnormalities, metabolic changes, etc. Thyroid hormones (THs) serve as master regulators for diverse remodeling processes of the cardiovascular system-from the prenatal period to death. THs promote a beneficial cardiomyocyte shape and improve contractility, relaxation, and survival via reversal of molecular remodeling. THs reduce fibrosis by decreasing interstitial collagen and reduce the incidence and duration of arrhythmias via remodeling ion channel expression and function. THs restore metabolic function and also improve blood flow both by direct effects on the vessel architecture and decreasing atherosclerosis. Optimal levels of THs both in the circulation and in cardiac tissues are critical for normal homeostasis. This review highlights TH-based remodeling and clinically translatable strategies for diverse cardiovascular disorders.
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Affiliation(s)
- Viswanathan Rajagopalan
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Northern Blvd, PO Box 8000, Old Westbury, NY, 11568-8000, USA,
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Holmager P, Schmidt U, Mark P, Andersen U, Dominguez H, Raymond I, Zerahn B, Nygaard B, Kistorp C, Faber J. Long-term L-Triiodothyronine (T3) treatment in stable systolic heart failure patients: a randomised, double-blind, cross-over, placebo-controlled intervention study. Clin Endocrinol (Oxf) 2015; 83:931-7. [PMID: 25359424 DOI: 10.1111/cen.12648] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 10/10/2014] [Accepted: 10/24/2014] [Indexed: 11/28/2022]
Abstract
BACKGROUND Chronic heart failure (HF) is characterized by reduced serum T3 levels and increased activity of the T3 degrading enzyme deiodinase D3. This may result in an intracellular composition of the cardiomyocyte mimicking that of hypothyroidism. Short-term T3-administration to systolic HF patients might be beneficial. QUESTION Does long-term treatment with T3 have a beneficial effect on cardiac function and neurohormonal activation in chronic systolic HF patients with serum T3 levels below 1·6 nmol/l? DESIGN A randomized, double-blind, cross-over, placebo-controlled intervention study with oral T3 treatment twice daily for 3 months. The T3 dose was uptitrated to a final dose avoiding reduced TSH levels. PRIMARY END-POINT Left-ventricular ejection fraction (LVEF). METHODS Cardiac imaging was performed using multiple gated tomographic radionuclide ventriculography (MUGA-SPECT). Neurohormonal stimulation was evaluated by plasma measurements of natriuretic peptides, aldosterone, renin, noradrenalin and copeptin levels. The patients were monitored for potential cardiac arrhythmias at the start of each treatment period. RESULTS Thirteen patients completed the protocol. Mean LVEF was 43%, range: 37-52 and serum T3 levels 1·4 nmol/l (0·9-1·6). The T3 dose was 20 μg per day (10-40). TSH levels did not change between groups, whereas serum T3 levels increased in the active arm. Cardiac function as measured by LVEF, end-diastolic and end-systolic volumes and cardiac output did not change during T3-treatment and neither did the neurohormonal profile. There were no side-effects in terms of cardiac arrhythmias and no change in resting heart rate. CONCLUSIONS This study does not support the hypothesis that oral T3 treatment might be beneficial to patients with chronic, stable systolic HF with a modest degree of reduced LVEF and low-normal serum T3 concentrations. The study included both functional studies of heart contractility as well as measures of the neurohormonal activation.
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Affiliation(s)
- Pernille Holmager
- Department of Medicine, Endocrine Unit, Herlev University Hospital, Herlev, Denmark
| | - Ulla Schmidt
- Department of Medicine, Endocrine Unit, Herlev University Hospital, Herlev, Denmark
| | - Peter Mark
- Department of Medicine, Endocrine Unit, Herlev University Hospital, Herlev, Denmark
| | - Ulrik Andersen
- Clinical Physiology and Nuclear Medicine, Glostrup University Hospital, Glostrup, Denmark
| | - Helena Dominguez
- Department of Cardiology, Frederiksberg Hospital, Frederiksberg, Denmark
| | - Ilan Raymond
- Department of Cardiology, Frederiksberg Hospital, Frederiksberg, Denmark
| | - Bo Zerahn
- Clinical Physiology and Nuclear Medicine, Herlev University Hospital, Herlev, Denmark
| | - Birte Nygaard
- Department of Medicine, Endocrine Unit, Herlev University Hospital, Herlev, Denmark
| | - Caroline Kistorp
- Department of Medicine, Endocrine Unit, Herlev University Hospital, Herlev, Denmark
- Faculty of Health Sciences, Copenhagen University, Denmark
| | - Jens Faber
- Department of Medicine, Endocrine Unit, Herlev University Hospital, Herlev, Denmark
- Faculty of Health Sciences, Copenhagen University, Denmark
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Tamijani SMS, Karimi B, Amini E, Golpich M, Dargahi L, Ali RA, Ibrahim NM, Mohamed Z, Ghasemi R, Ahmadiani A. Thyroid hormones: Possible roles in epilepsy pathology. Seizure 2015; 31:155-64. [PMID: 26362394 DOI: 10.1016/j.seizure.2015.07.021] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 07/26/2015] [Accepted: 07/27/2015] [Indexed: 11/16/2022] Open
Abstract
Thyroid hormones (THs) L-thyroxine and L-triiodothyronine, primarily known as metabolism regulators, are tyrosine-derived hormones produced by the thyroid gland. They play an essential role in normal central nervous system development and physiological function. By binding to nuclear receptors and modulating gene expression, THs influence neuronal migration, differentiation, myelination, synaptogenesis and neurogenesis in developing and adult brains. Any uncorrected THs supply deficiency in early life may result in irreversible neurological and motor deficits. The development and function of GABAergic neurons as well as glutamatergic transmission are also affected by THs. Though the underlying molecular mechanisms still remain unknown, the effects of THs on inhibitory and excitatory neurons may affect brain seizure activity. The enduring predisposition of the brain to generate epileptic seizures leads to a complex chronic brain disorder known as epilepsy. Pathologically, epilepsy may be accompanied by mitochondrial dysfunction, oxidative stress and eventually dysregulation of excitatory glutamatergic and inhibitory GABAergic neurotransmission. Based on the latest evidence on the association between THs and epilepsy, we hypothesize that THs abnormalities may contribute to the pathogenesis of epilepsy. We also review gender differences and the presumed underlying mechanisms through which TH abnormalities may affect epilepsy here.
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Affiliation(s)
| | - Benyamin Karimi
- Department of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Elham Amini
- Department of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Mojtaba Golpich
- Department of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Leila Dargahi
- NeuroBiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Raymond Azman Ali
- Department of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Norlinah Mohamed Ibrahim
- Department of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Kuala Lumpur, Malaysia
| | - Zahurin Mohamed
- Department of Pharmacology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Rasoul Ghasemi
- Department of Physiology, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Neurophysiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Abolhassan Ahmadiani
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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Vaitkus JA, Farrar JS, Celi FS. Thyroid Hormone Mediated Modulation of Energy Expenditure. Int J Mol Sci 2015; 16:16158-75. [PMID: 26193258 PMCID: PMC4519944 DOI: 10.3390/ijms160716158] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 07/07/2015] [Accepted: 07/09/2015] [Indexed: 01/15/2023] Open
Abstract
Thyroid hormone (TH) has diverse effects on mitochondria and energy expenditure (EE), generating great interest and research effort into understanding and harnessing these actions for the amelioration and treatment of metabolic disorders, such as obesity and diabetes. Direct effects on ATP utilization are a result of TH's actions on metabolic cycles and increased cell membrane ion permeability. However, the majority of TH induced EE is thought to be a result of indirect effects, which, in turn, increase capacity for EE. This review discusses the direct actions of TH on EE, and places special emphasis on the indirect actions of TH, which include mitochondrial biogenesis and reduced metabolic efficiency through mitochondrial uncoupling mechanisms. TH analogs and the metabolic actions of T2 are also discussed in the context of targeted modulation of EE. Finally, clinical correlates of TH actions on metabolism are briefly presented.
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Affiliation(s)
- Janina A Vaitkus
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Virginia Commonwealth University School of Medicine, Richmond, VA 23298, USA.
| | - Jared S Farrar
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Virginia Commonwealth University School of Medicine, Richmond, VA 23298, USA.
| | - Francesco S Celi
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Virginia Commonwealth University School of Medicine, Richmond, VA 23298, USA.
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Szkudlarek AC, Aldenucci B, Miyagui NI, Silva IK, Moraes RN, Ramos HE, Fogaça RTH. Short-term thyroid hormone excess affects the heart but does not affect adrenal activity in rats. Arq Bras Cardiol 2014; 102:270-8. [PMID: 24676225 PMCID: PMC3987310 DOI: 10.5935/abc.20140014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Accepted: 09/19/2013] [Indexed: 12/26/2022] Open
Abstract
Background Hyperthyroidism (Hy) exerts a broad range of influences on a variety of
physiological parameters. Its disruptive effect on cardiovascular system is one of
its most remarkable impacts. Moreover, Hy has been clinically associated with
stress - induced hyperactivation of the hypothalamic-pituitary-adrenal axis. Objective Evaluate the impact of short-term Hy on cardiac performance and adrenal activity
of rats. Methods Induction of Hy in Wistar rats through injections of T3 (150
µg/kg) for 10 days (hyperthyroid group - HG) or vehicle (control
group). The cardiovascular performance was evaluated by: echocardiography (ECHO);
heart weight/body weight (mg/gr) ratio; contractility of isolated papillary
muscles (IPM) and direct measurement of blood pressures. Adrenal activity was
evaluated by adrenal weight/body weight (mg/gr) ratio and 24-hour fecal
corticosterone (FC) levels on the, 5th and 10th days of T3
treatment. Results In HG, the ECHO showed reduction of the End Systolic and End Diastolic Volumes,
Ejection, Total Diastolic and Isovolumic Relaxation Times, Diastolic and Systolic
Areas and E/A ratio. Heart Rate, Ejection Fraction and Cardiac Output increased.
The heart weight/body weight ratio was higher. Similarly, in IPM, the maximum rate
of force decay during relaxation was higher in all extracellular calcium
concentrations. Systolic blood pressure (SBP) levels were higher. (p ≤ 0.05). On
the other hand, there was no difference in the adrenal weight/body weight ratio or
in the 24-hour FC levels. Conclusions Hy induces positive inotropic, chronotropic and lusitropic effects on the heart by
direct effects of T3 and increases SBP. Those alterations are not correlated with
changes in the adrenal activity.
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13
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Walrand S, Short KR, Heemstra LA, Novak CM, Levine JA, Coenen-Schimke JM, Nair KS. Altered regulation of energy homeostasis in older rats in response to thyroid hormone administration. FASEB J 2013; 28:1499-510. [PMID: 24344330 DOI: 10.1096/fj.13-239806] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Hyperthyroidism causes increased energy intake and expenditure, although anorexia and higher weight loss have been reported in elderly individuals with hyperthyroidism. To determine the effect of age on energy homeostasis in response to experimental hyperthyroidism, we administered 200 μg tri-iodothyronine (T3) in 7- and 27-mo-old rats for 14 d. T3 increased energy expenditure (EE) in both the young and the old rats, although the old rats lost more weight (147 g) than the young rats (58 g) because of the discordant effect of T3 on food intake, with a 40% increase in the young rats, but a 40% decrease in the old ones. The increased food intake in the young rats corresponded with a T3-mediated increase in the appetite-regulating proteins agouti-related peptide, neuropeptide Y, and uncoupling protein 2 in the hypothalamus, but no increase occurred in the old rats. Evidence of mitochondrial biogenesis in response to T3 was similar in the soleus muscle and heart of the young and old animals, but less consistent in old plantaris muscle and liver. Despite the comparable increase in EE, T3's effect on mitochondrial function was modulated by age in a tissue-specific manner. We conclude that older rats lack compensatory mechanisms to increase caloric intake in response to a T3-induced increase in EE, demonstrating a detrimental effect of age on energy homeostasis.
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Affiliation(s)
- Stephane Walrand
- 1Endocrinology Research Unit, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.
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14
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Haviland JA, Reiland H, Butz DE, Tonelli M, Porter WP, Zucchi R, Scanlan TS, Chiellini G, Assadi-Porter FM. NMR-based metabolomics and breath studies show lipid and protein catabolism during low dose chronic T(1)AM treatment. Obesity (Silver Spring) 2013; 21:2538-44. [PMID: 23512955 PMCID: PMC3692609 DOI: 10.1002/oby.20391] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 01/08/2013] [Accepted: 01/09/2013] [Indexed: 11/06/2022]
Abstract
OBJECTIVE 3-Iodothyronamine (T1 AM), an analog of thyroid hormone, is a recently discovered fast-acting endogenous metabolite. Single high-dose treatments of T1 AM have produced rapid short-term effects, including a reduction of body temperature, bradycardia, and hyperglycemia in mice. DESIGN AND METHODS The effect of daily low doses of T1 AM (10 mg/kg) for 8 days on weight loss and metabolism in spontaneously overweight mice was monitored. The experiments were repeated twice (n = 4). Nuclear magnetic resonance (NMR) spectroscopy of plasma and real-time analysis of exhaled (13) CO2 in breath by cavity ring down spectroscopy (CRDS) were used to detect T1 AM-induced lipolysis. RESULTS CRDS detected increased lipolysis in breath shortly after T1 AM administration that was associated with a significant weight loss but independent of food consumption. NMR spectroscopy revealed alterations in key metabolites in serum: valine, glycine, and 3-hydroxybutyrate, suggesting that the subchronic effects of T1 AM include both lipolysis and protein breakdown. After discontinuation of T1 AM treatment, mice regained only 1.8% of the lost weight in the following 2 weeks, indicating lasting effects of T1 AM on weight maintenance. CONCLUSIONS CRDS in combination with NMR and (13) C-metabolic tracing constitute a powerful method of investigation in obesity studies for identifying in vivo biochemical pathway shifts and unanticipated debilitating side effects.
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Affiliation(s)
- J. A. Haviland
- Department of Zoology, University of Wisconsin-Madison, 250 N. Mills Street, Madison, WI 53706, USA
| | - H. Reiland
- Department of Biochemistry, 433 Babcock Drive, Madison, WI 53706, USA
| | - D. E. Butz
- Department of Zoology, University of Wisconsin-Madison, 250 N. Mills Street, Madison, WI 53706, USA
| | - M. Tonelli
- National Magnetic Resonance Facility at Madison, 433 Babcock Drive, Madison, WI 53706, USA
| | - W. P. Porter
- Department of Zoology, University of Wisconsin-Madison, 250 N. Mills Street, Madison, WI 53706, USA
| | - R. Zucchi
- Dipartimento di Scienze dell’Uomo e dell’Ambiente, Università di Pisa, Pisa 56126, Italy
| | - T. S. Scanlan
- Department of Physiology & Pharmacology and Cell & Developmental Biology, Oregon Health & Science University, Portland, OR 97239-3098, USA
| | - G. Chiellini
- Department of Biochemistry, 433 Babcock Drive, Madison, WI 53706, USA
- Dipartimento di Scienze dell’Uomo e dell’Ambiente, Università di Pisa, Pisa 56126, Italy
- Authors of correspondence: NMR and breath studies: Fariba Assadi-Porter, Department of Biochemistry, 433 Babcock Dr, Madison WI 53706. Phone: (608) 261-1167; Fax: (608) 262-3453; , Animal design: Grazia Chiellini, Department of Biochemistry, 433 Babcock Dr, Madison WI 53706. Phone: (608)-262-3268, ; Dipartimento di Scienze dell’Uomo e dell’Ambiente, Università di Pisa, via Roma, 55 Pisa 56126, Italy. Phone: +39 050 2218677,
| | - F. M. Assadi-Porter
- National Magnetic Resonance Facility at Madison, 433 Babcock Drive, Madison, WI 53706, USA
- Department of Biochemistry, 433 Babcock Drive, Madison, WI 53706, USA
- Authors of correspondence: NMR and breath studies: Fariba Assadi-Porter, Department of Biochemistry, 433 Babcock Dr, Madison WI 53706. Phone: (608) 261-1167; Fax: (608) 262-3453; , Animal design: Grazia Chiellini, Department of Biochemistry, 433 Babcock Dr, Madison WI 53706. Phone: (608)-262-3268, ; Dipartimento di Scienze dell’Uomo e dell’Ambiente, Università di Pisa, via Roma, 55 Pisa 56126, Italy. Phone: +39 050 2218677,
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15
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Cioffi F, Senese R, Lanni A, Goglia F. Thyroid hormones and mitochondria: with a brief look at derivatives and analogues. Mol Cell Endocrinol 2013; 379:51-61. [PMID: 23769708 DOI: 10.1016/j.mce.2013.06.006] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 05/22/2013] [Accepted: 06/06/2013] [Indexed: 12/22/2022]
Abstract
Thyroid hormones (TH) have a multiplicity of effects. Early in life, they mainly affect development and differentiation, while later on they have particularly important influences over metabolic processes in almost all tissues. It is now quite widely accepted that thyroid hormones have two types of effects on mitochondria. The first is a rapid stimulation of respiration, which is evident within minutes/hours after hormone treatment, and it is probable that extranuclear/non-genomic mechanisms underlie this effect. The second response occurs one to several days after hormone treatment, and leads to mitochondrial biogenesis and to a change in mitochondrial mass. The hormone signal for the second response involves both T3-responsive nuclear genes and a direct action of T3 at mitochondrial binding sites. T3, by binding to a specific mitochondrial receptor and affecting the transcription apparatus, may thus act in a coordinated manner with the T3 nuclear pathway to regulate mitochondrial biogenesis and turnover. Transcription factors, coactivators, corepressors, signaling pathways and, perhaps, all play roles in these mechanisms. This review article focuses chiefly on TH, but also looks briefly at some analogues and derivatives (on which the data is still somewhat patchy). We summarize data obtained recently and in the past to try to obtain an updated picture of the current research position concerning the metabolic effects of TH, with particular emphasis on those exerted via mitochondria.
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Affiliation(s)
- Federica Cioffi
- Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via Port'Arsa 11, 82100 Benevento, Italy
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16
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Storaci V, Eblen-Zajjur A. Nongenomic effect of levothyroxine on the synchronous electrical activity of the spinal dorsal horn in the rat. Somatosens Mot Res 2013; 31:23-7. [PMID: 23919349 DOI: 10.3109/08990220.2013.819798] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Levothyroxine (T4) has a well-known effect on the central nervous system (CNS). This effect requires hours of latency by genetic pathway. We tested for short latency nongenomic effects of T4 superfusion on the spinal dorsal horn (DH) evaluating lumbar somatosensory evoked potentials in rats. T4 increased N and P wave amplitudes and N wave area under the curve, but reduced P wave duration and N-P interval, suggesting that T4 exerts both excitatory and synchronizing effects on DH interneurons in less than 300 s, thus, providing evidence of nongenomic effects of T4 on DH.
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Affiliation(s)
- Verónika Storaci
- Dpto. de Biología, Facultad de Ciencias y Tecnología, Universidad de Carabobo , Valencia , Venezuela
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17
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Moffett SX, Giannopoulos PF, James TD, Martin JV. Effects of acute microinjections of thyroid hormone to the preoptic region of hypothyroid adult male rats on sleep, motor activity and body temperature. Brain Res 2013; 1516:55-65. [PMID: 23603414 DOI: 10.1016/j.brainres.2013.04.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 04/05/2013] [Accepted: 04/07/2013] [Indexed: 01/28/2023]
Abstract
Thyroid hormones induce short-latency nongenomic effects in adult brain tissue, suggesting that their acute administration would affect brain activity in intact animals. The influence on EEG-defined sleep of acute restoration of l-3,3'5-triiodothyronine (T3) to a sleep-regulatory brain region, the preoptic region, was examined in hypothyroid rats. Sleep parameters were monitored for 48 h weekly: for 24 h immediately following a control microinjection and for an additional 24h after a second microinjection including a T3 dose to the preoptic region or lateral ventricle. Male albino rats were implanted with EEG and EMG electrodes, abdominal temperature/activity transponders and unilateral lateral ventricle cannulae or bilateral preoptic region cannulae, and were given 0.02% n-propythiouracil (PTU) in their drinking water for 4 weeks. For histologically-confirmed bilateral preoptic region cannula placements (N=7), effects of T3 (especially a 3 μg dose) were apparent within 10h of injection as decreases in REM, NREM and total sleep and increases in waking and activity. Minimal effects of lateral ventricle T3 microinjection were demonstrated (N=5). Significant effects due to the time of day on the experimental measures were seen in both lateral ventricle and preoptic region groups, but these effects did not interact with the effect of administered hormone dose. These effects of T3 microinjection to the preoptic region were demonstrated after acute injections and within hours of injection rather than after chronic administration over days.
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Affiliation(s)
- Steven X Moffett
- Department of Biology, Rutgers University, Camden, NJ 08055, USA
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18
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Cordeiro A, Souza LL, Einicker-Lamas M, Pazos-Moura CC. Non-classic thyroid hormone signalling involved in hepatic lipid metabolism. J Endocrinol 2013; 216:R47-57. [PMID: 23297113 DOI: 10.1530/joe-12-0542] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Thyroid hormones are important modulators of lipid metabolism because the liver is a primary hormonal target. The hypolipidaemic effects of thyroid hormones result from the balance between direct and indirect actions resulting in stimulation of lipid synthesis and lipid oxidation, which favours degradation pathways. Originally, it was believed that thyroid hormone activity was only transduced by alteration of gene transcription mediated by the nuclear receptor thyroid hormone receptors, comprising the classic action of thyroid hormone. However, the discovery of other effects independent of this classic mechanism characterised a new model of thyroid hormone action, the non-classic mechanism that involves other signalling pathways. To date, this mechanism and its relevance have been intensively described. Considering the increasing evidence for non-classic signalling of thyroid hormones and the major influence of these hormones in the regulation of lipid metabolism, we reviewed the role of thyroid hormone in cytosolic signalling cascades, focusing on the regulation of second messengers, and the activity of effector proteins and the implication of these mechanisms on the control of hepatic lipid metabolism.
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Affiliation(s)
- Aline Cordeiro
- Biophysics Institute Carlos Chagas Filho, Federal University of Rio de Janeiro, Centro de Ciências da Saúde, Avenida Carlos Chagas Filho, 373, Bloco G, Cidade Universitária - Ilha do Fundão, Rio de Janeiro - RJ 21941-902, Brazil.
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19
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Crupi R, Paterniti I, Campolo M, Di Paola R, Cuzzocrea S, Esposito E. Exogenous T3 administration provides neuroprotection in a murine model of traumatic brain injury. Pharmacol Res 2013; 70:80-9. [PMID: 23313345 DOI: 10.1016/j.phrs.2012.12.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 12/12/2012] [Accepted: 12/26/2012] [Indexed: 01/26/2023]
Abstract
Traumatic brain injury (TBI) induces primary and secondary damage in both the endothelium and the brain parenchyma. While neurons die quickly by necrosis, a vicious cycle of secondary injury in endothelial cells exacerbates the initial injury. Thyroid hormones are reported to be decreased in patients with brain injury. Controlled cortical impact injury (CCI) is a widely used, clinically relevant model of TBI. Here, using CCI in adult male mice, we set to determine whether 3,5,3'-triiodothyronine (T3) attenuates posttraumatic neurodegeneration and neuroinflammation in an experimental model of TBI. Treatment with T3 (1.2μg/100g body weight, i.p.) 1h after TBI resulted in a significant improvement in motor and cognitive recovery after CCI, as well as in marked reduction of lesion volumes. Mouse model for brain injury showed reactive astrocytes with increased glial fibrillary acidic protein, and formation of inducible nitric oxide synthase (iNOS). Western blot analysis revealed the ability of T3 to reduce brain trauma through modulation of cytoplasmic-nuclear shuttling of nuclear factor-κB (NF-κB). Twenty-four hours after brain trauma, T3-treated mice also showed significantly lower number of TUNEL(+) apoptotic neurons and curtailed induction of Bax, compared to vehicle control. In addition, T3 significantly enhanced the post-TBI expression of the neuroprotective neurotrophins (BDNF and GDNF) compared to vehicle. Our data provide an additional mechanism for the anti-inflammatory effects of thyroid hormone with critical implications in immunopathology at the cross-roads of the immune-endocrine circuits.
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Affiliation(s)
- Rosalia Crupi
- Department of Biological and Environmental Sciences, University of Messina, Italy
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20
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Dietrich JW, Landgrafe G, Fotiadou EH. TSH and Thyrotropic Agonists: Key Actors in Thyroid Homeostasis. J Thyroid Res 2012; 2012:351864. [PMID: 23365787 PMCID: PMC3544290 DOI: 10.1155/2012/351864] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Accepted: 11/21/2012] [Indexed: 12/11/2022] Open
Abstract
This paper provides the reader with an overview of our current knowledge of hypothalamic-pituitary-thyroid feedback from a cybernetic standpoint. Over the past decades we have gained a plethora of information from biochemical, clinical, and epidemiological investigation, especially on the role of TSH and other thyrotropic agonists as critical components of this complex relationship. Integrating these data into a systems perspective delivers new insights into static and dynamic behaviour of thyroid homeostasis. Explicit usage of this information with mathematical methods promises to deliver a better understanding of thyrotropic feedback control and new options for personalised diagnosis of thyroid dysfunction and targeted therapy, also by permitting a new perspective on the conundrum of the TSH reference range.
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Affiliation(s)
- Johannes W. Dietrich
- Lab XU44, Medical Hospital I, Bergmannsheil University Hospitals, Ruhr University of Bochum (UK RUB), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, NRW, Germany
| | - Gabi Landgrafe
- Lab XU44, Medical Hospital I, Bergmannsheil University Hospitals, Ruhr University of Bochum (UK RUB), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, NRW, Germany
- Klinik für Allgemein- und Visceralchirurgie, Agaplesion Bethesda Krankenhaus Wuppertal gGmbH, Hainstraße 35, 42109 Wuppertal, NRW, Germany
| | - Elisavet H. Fotiadou
- Lab XU44, Medical Hospital I, Bergmannsheil University Hospitals, Ruhr University of Bochum (UK RUB), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, NRW, Germany
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21
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Xu W, Hou D, Jiang X, Lu Z, Guo T, Liu Y, Wang D, Zen K, Yu B, Zhang CY. The protective role of peroxisome proliferator-activated receptor γ coactivator-1α in hyperthyroid cardiac hypertrophy. J Cell Physiol 2012; 227:3243-53. [DOI: 10.1002/jcp.24015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Gnocchi D, Leoni S, Incerpi S, Bruscalupi G. 3,5,3'-triiodothyronine (T3) stimulates cell proliferation through the activation of the PI3K/Akt pathway and reactive oxygen species (ROS) production in chick embryo hepatocytes. Steroids 2012; 77:589-95. [PMID: 22366194 DOI: 10.1016/j.steroids.2012.01.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Revised: 01/30/2012] [Accepted: 01/31/2012] [Indexed: 11/18/2022]
Abstract
Thyroid hormones (THs) have a wide variety of essential roles in vertebrates, ranging from the regulation of key metabolic processes to cell proliferation and apoptosis. The classical mechanism of action of THs is genomic; 3,5,3'-triiodothyronine (T3) binds to specific nuclear receptors (TRs) and modifies the expression of specific genes. Recently, a new category of mechanisms, termed nongenomic, has been discovered for T3. These mechanisms include, among others, the rapid activation of signal transduction pathways, such as PI3K/Akt and MAPK, which eventually lead to cell proliferation. These effects are mediated in some cell types by a plasma membrane receptor, identified as integrin αvβ3, and in other cell types by cytoplasmic TRβ1. The aim of this work was to analyze the effect of T3 on the cell growth of chick embryo hepatocytes at two different stages of development, 14 and 19 days, and to determine the activation of the signal transduction pathways, focusing on the potential involvement of a plasma membrane receptor and the possible participation of PI3K/Akt and reactive oxygen species (ROS). Our results clearly show that T3 stimulates cell proliferation at both stages of development through the activation of the PI3K/Akt pathway and the production of small amounts of ROS, which operate as effective second messengers. Moreover, we prove that these effects are not initiated at the plasma membrane receptor for T3.
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Affiliation(s)
- Davide Gnocchi
- Department of Biology and Biotechnology Charles Darwin, Sapienza University of Rome, Rome, Italy.
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23
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Huggins P, Johnson CK, Schoergendorfer A, Putta S, Bathke AC, Stromberg AJ, Voss SR. Identification of differentially expressed thyroid hormone responsive genes from the brain of the Mexican Axolotl (Ambystoma mexicanum). Comp Biochem Physiol C Toxicol Pharmacol 2012; 155:128-35. [PMID: 21457787 PMCID: PMC3166550 DOI: 10.1016/j.cbpc.2011.03.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 03/23/2011] [Accepted: 03/23/2011] [Indexed: 01/20/2023]
Abstract
The Mexican axolotl (Ambystoma mexicanum) presents an excellent model to investigate mechanisms of brain development that are conserved among vertebrates. In particular, metamorphic changes of the brain can be induced in free-living aquatic juveniles and adults by simply adding thyroid hormone (T4) to rearing water. Whole brains were sampled from juvenile A. mexicanum that were exposed to 0, 8, and 18 days of 50 nM T4, and these were used to isolate RNA and make normalized cDNA libraries for 454 DNA sequencing. A total of 1,875,732 high quality cDNA reads were assembled with existing ESTs to obtain 5884 new contigs for human RefSeq protein models, and to develop a custom Affymetrix gene expression array (Amby_002) with approximately 20,000 probe sets. The Amby_002 array was used to identify 303 transcripts that differed statistically (p<0.05, fold change >1.5) as a function of days of T4 treatment. Further statistical analyses showed that Amby_002 performed concordantly in comparison to an existing, small format expression array. This study introduces a new A. mexicanum microarray resource for the community and the first lists of T4-responsive genes from the brain of a salamander amphibian.
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Affiliation(s)
- P Huggins
- Department of Statistics, University of Kentucky, Lexington, KY 40506, USA
| | - CK Johnson
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA
| | - A Schoergendorfer
- Department of Statistics, University of Kentucky, Lexington, KY 40506, USA
| | - S Putta
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA
| | - AC Bathke
- Department of Statistics, University of Kentucky, Lexington, KY 40506, USA
| | - AJ Stromberg
- Department of Statistics, University of Kentucky, Lexington, KY 40506, USA
| | - SR Voss
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA
- Communicating author: Randal Voss: , Tel: 859-257-9888; Fax: 859-257-1717
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24
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Acute T3 treatment protects the heart against ischemia-reperfusion injury via TRα1 receptor. Mol Cell Biochem 2011; 353:235-41. [DOI: 10.1007/s11010-011-0791-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Accepted: 03/17/2011] [Indexed: 10/18/2022]
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