scholarly journals Stress and thyroid gland

2010 ◽  
Vol 56 (4) ◽  
pp. 443-456 ◽  
Author(s):  
L.I. Nadolnik
Keyword(s):  
Thyroid Hormones ◽  
The Body ◽  
Direct Effects ◽  
Thyroid Status ◽  
Acute And Chronic Stress ◽  
Adrenal System ◽  
Thyroid Metabolism ◽  
Peripheral Metabolism ◽  
Different Tissues

The review highlights the effects of acute and chronic stress on thyroid metabolism. Special attention is paid to the influence of stress and the direct effects of glucocorticoids on the thyroid status, the activities of thyrocyte iodine uptake, oxidation and organification as well as peripheral metabolism of thyroid hormones (deposition and transport of thyroid hormones, deiodinase activities in different tissues). The role of stress in the development of thyroid pathology is analysed and charestiristic features of thyroid function alterations during impaired functioning of the pitiutary-adrenal system are established. The mechanisms of the stress-induced impairments in thyroid functions are of interest for further research, taking into consideration serious consequences of thyroid deficiency for the body, even in subclinical thyroid insufficiency.

Regulation by thyroid status of c-myc, c-fos and H-ras mRNAs in the rat myocardium

1991 ◽  
Vol 130 (2) ◽  
pp. 239-244 ◽  
Author(s):  
N. K. Green ◽  
M. D. Gammage ◽  
J. A. Franklyn ◽  
M. C. Sheppard
Keyword(s):  
Protein Synthesis ◽  
Thyroid Hormones ◽  
Contractile Protein ◽  
Rat Myocardium ◽  
Direct Effects ◽  
Thyroid Status ◽  
Critical Signal ◽  
Ras Genes ◽  
Intracellular Signals ◽  
Oncogene Products

ABSTRACT Effects of thyroid status on expression of a variety of myocardial genes, such as those encoding contractile proteins, have been reported, as well as interactions between thyroid hormones and developmental and haemodynamic regulation of contractile protein synthesis. In addition, it is clear that developmental and haemodynamic factors regulate expression of specific proto-oncogenes, including c-myc, c-fos and H-ras, in the myocardium but the effect of thyroid status on such proto-oncogene products, which are proposed to play a critical signal-transducing role in the heart, has been previously unexplored. In order to determine whether changes in thyroid status are associated with changes in expression of these putative intracellular signals, we examined the effect of hypothyroidism and tri-iodothyronine (T3) treatment on myocardial levels of c-myc, c-fos and H-ras mRNAs in the rat. The induction of hypothyroidism was associated with a marked increase in myocardial c-myc, c-fos and H-ras mRNAs, changes reversed by 72 h of T3 replacement. Administration of T3 to euthyroid rats had no significant effect on myocardial c-myc or c-fos mRNAs, but inhibition of H-ras mRNA by T3 was evident. These observations demonstrating influences of thyroid status on expression of specific proto-oncogenes suggest that thyroid hormones, as well as exerting direct effects on expression of functionally important myocardial genes, also interact with the cellular transduction pathways mediated by the products of the c-myc, c-fos and H-ras genes. Journal of Endocrinology (1991) 130, 239–244

scholarly journals Potential therapeutic manipulations of the CXCR3 chemokine axis for the treatment of inflammatory fibrosing diseases

F1000Research ◽  
2020 ◽  
Vol 9 ◽  
pp. 1197
Author(s):  
Morgan K. Groover ◽  
Jillian M. Richmond
Keyword(s):  
Wound Healing ◽  
Tumor Metastasis ◽  
Ex Vivo ◽  
Experimental Models ◽  
The Body ◽  
Human Tissues ◽  
Inflammatory Processes ◽  
Opinion Article ◽  
Different Tissues

Chemokines play important roles in homeostasis and inflammatory processes. While their roles in leukocyte recruitment are well-appreciated, chemokines play additional roles in the body, including mediating or regulating angiogenesis, tumor metastasis and wound healing. In this opinion article, we focus on the role of CXCR3 and its ligands in fibrotic processes. We emphasize differences of the effects of each ligand, CXCL9, CXCL10 and CXCL11, on fibroblasts in different tissues of the body. We include discussions of differences in signaling pathways that may account for protective or pro-fibrotic effects of each ligand in different experimental models and ex vivo analysis of human tissues. Our goal is to highlight potential reasons why there are disparate findings in different models, and to suggest ways in which this chemokine axis could be manipulated for the treatment of fibrosis.

scholarly journals Thyroid Hormone Plays an Important Role in Cardiac Function: From Bench to Bedside

2021 ◽  
Vol 12 ◽  
Author(s):  
Hiroyuki Yamakawa ◽  
Tomoko S. Kato ◽  
Jaeduk Yoshimura Noh ◽  
Shinsuke Yuasa ◽  
Akio Kawamura ◽  
...  
Keyword(s):  
Thyroid Hormones ◽  
Cardiac Function ◽  
Cardiovascular System ◽  
Antiarrhythmic Agent ◽  
Current Knowledge ◽  
Cardiac Contractility ◽  
The Body ◽  
The Past ◽  
Systolic And Diastolic Function

Thyroid hormones (THs) are synthesized in the thyroid gland, and they circulate in the blood to regulate cells, tissues, and organs in the body. In particular, they exert several effects on the cardiovascular system. It is well known that THs raise the heart rate and cardiac contractility, improve the systolic and diastolic function of the heart, and decrease systemic vascular resistance. In the past 30 years, some researchers have studied the molecular pathways that mediate the role of TH in the cardiovascular system, to better understand its mechanisms of action. Two types of mechanisms, which are genomic and non-genomic pathways, underlie the effects of THs on cardiomyocytes. In this review, we summarize the current knowledge of the action of THs in the cardiac function, the clinical manifestation and parameters of their hemodynamics, and treatment principles for patients with hyperthyroid- or hypothyroid-associated heart disease. We also describe the cardiovascular drugs that induce thyroid dysfunction and explain the mechanism underlying the thyroid toxicity of amiodarone, which is considered the most effective antiarrhythmic agent. Finally, we discuss the recent reports on the involvement of thyroid hormones in the regulation of myocardial regeneration and metabolism in the adult heart.

scholarly journals The effect of selenium on thyroid status in a population with marginal selenium and iodine status

2005 ◽  
Vol 94 (6) ◽  
pp. 962-968 ◽  
Author(s):  
Christine D. Thomson ◽  
Sarah K. McLachlan ◽  
Andrea M. Grant ◽  
Elaine Paterson ◽  
Anna J. Lillico
Keyword(s):  
New Zealand ◽  
Thyroid Hormones ◽  
Thyroid Volume ◽  
Thyroid Status ◽  
Cross Sectional ◽  
Thyroid Metabolism ◽  
Optimal Function ◽  
The Relationship ◽  
Gpx Activity ◽  
Se Status

The effects of Se on thyroid metabolism in a New Zealand population are investigated, including (a) the relationship between Se and thyroid status, and (b) the effect of Se supplementation on thyroid status. The data used come from two cross-sectional studies of Se, I, thyroid hormones and thyroid volume (studies 1 and 4), and three Se intervention studies in which thyroid hormones, Se and glutathione peroxidase (GPx) activities were measured (studies 2, 3 and 5). There were no significant correlations between Se status and measures of thyroid status after controlling for sex at baseline or after supplementation in any of the studies. When data from study 4 were divided into two groups according to plasma Se, plasma thyroxine (T4) was lower in males with higher plasma Se levels (P=0·009). Se supplementation increased plasma Se and GPx activity, but produced only small changes in plasma T4and triiodothyronine (T3):T4ratio. In study 2, there was a significant reduction in plasma T4(P=0·0045). In studies 3 and 5 there were small decreases in plasma T4and a small increase in the T3:T4ratio, which were not significantly different from placebo groups. Lack of significant associations between plasma Se and thyroid status, and only small changes in T4suggest that Se status in New Zealand is close to adequate for the optimal function of deiodinases. Adequate plasma Se may be approximately 0·82–0·90 μmol/l, compared with 1·00–1·14 μmol/l for maximal GPx activities.

Effects of hypo- and hyperthyroidism on pancreatic TRH-degrading activity and TRH concentrations in developing rat pancreas

1984 ◽  
Vol 106 (2) ◽  
pp. 209-214 ◽  
Author(s):  
Sonia Aratan-Spire ◽  
Bryan Wolf ◽  
Paul Czernichow
Keyword(s):  
Thyroid Hormone ◽  
Thyroid Hormones ◽  
Neonatal Period ◽  
Fold Increase ◽  
Thyroid Status ◽  
Thyrotrophin Releasing Hormone ◽  
Rat Pancreas ◽  
High Concentrations ◽  
Developing Rat

Abstract. High concentrations of thyrotrophin-releasing hormone (TRH) in the rat pancreas were detected during the first few days of life decreasing thereafter while pancreatic TRH-degrading activity (TRH-DA) absent at birth appeared on day 14 and increased to reach adult values by day 21. This period of life is also remarkable by the low level of circulating thyroid hormones. Since TRH-degrading activity may be thyroid hormone dependent it was of interest to study the effects of thyroid status fluctuations both on TRH-DA and TRH content during the neonatal period. In this study, hypo- and hyperthyroidism were induced by 6-n-propyl-2-thiouracil (PTU) and triiodothyronine (T3) respectively. Pancreatic TRH-DA and TRH concentrations were measured at different ages from birth until day 29, in treated animals and results compared to control age-matched rats. In hypothyroid rats, pancreatic TRH concentrations remained significantly higher after day 16 while TRH-DA was lower during the whole period studied. Following T3 treatment, pancreatic TRH concentrations decreased significantly from day 3 onwards. However, no significant changes were found for TRH-DA except a two-fold increase on day 28. These results suggest that two different mechanisms may account for thyroid hormones action: 1) a direct effect on pancreatic TRH 2) an inductive saturable effect on TRH-DA. Furthermore a fine tuner modulatory role of TRH-DA on TRH concentrations cannot be excluded.

scholarly journals Clinical implications of altered thyroid status in male testicular function

2009 ◽  
Vol 53 (8) ◽  
pp. 976-982 ◽  
Author(s):  
Simone Magagnin Wajner ◽  
Márcia Santos Wagner ◽  
Ana Luiza Maia
Keyword(s):  
Thyroid Hormone ◽  
Thyroid Hormones ◽  
Thyroid Status ◽  
Testicular Cells ◽  
Current Review ◽  
Human Spermatogenesis ◽  
Altered Thyroid ◽  
And Function ◽  
The Impact

Thyroid hormones are involved in the development and maintenance of virtually all tissues. Although for many years the testis was thought to be a thyroid-hormone unresponsive organ, studies of the last decades have demonstrated that thyroid dysfunction is associated not only with abnormalities in morphology and function of testes, but also with decreased fertility and alterations of sexual activity in men. Nowadays, the participation of triiodothyronine (T3) in the control of Sertoli and Leydig cell proliferation, testicular maturation, and steroidogenesis is widely accepted, as well as the presence of thyroid hormone transporters and receptors in testicular cells throughout the development process and in adulthood. But even with data suggesting that T3 may act directly on these cells to bring about its effects, there is still controversy regarding the impact of thyroid diseases on human spermatogenesis and fertility, which can be in part due to the lack of well-controlled clinical studies. The current review aims at presenting an updated picture of recent clinical data about the role of thyroid hormones in male gonadal function.

scholarly journals Impact of thyroid status on the response to ram effect in ewes

2018 ◽  
Vol 59 (1) ◽  
pp. 52
Author(s):  
J. MENEGATOS (Ι. ΜΕΝΕΓΑΤΟΣ) ◽  
S. CHADIO (Σ. ΧΑΔΙΩ) ◽  
D. KALOGIANNIS (Δ. ΚΑΛΟΓΙΑΝΝΗΣ) ◽  
V. BAMBIDIS (Β. ΜΠΑΜΠΙΔΗΣ) ◽  
I. VALASI (Ε. ΒΑΛΑΣΗ) ◽  
...  
Keyword(s):  
Thyroid Hormones ◽  
Reproductive Activity ◽  
Thyroid Status ◽  
Gonadotrophin Secretion ◽  
Group A ◽  
Ram Effect ◽  
The Difference ◽  
Group B

The role of thyroid hormones on the transition to anestrous has been well established in ewes, but their possible involvement in the induction of reproductive activity remains obscure. The aim of the present study was to investigate the role of thyroid hormones in the induction of the first ovulation in relation to "ram effect" in ewes. Fourty-four ewes of the Greek Zackel mountain type breed were used. The ewes were housed separately from the rams until day 0 (entrance of rams). Blood samples were collected weekly for 4 weeks until 11 weeks after the ram entrance for the determination of thyroxin and progesterone levels. Thirty-five out of 44 ewes (group A) had a silent heat, while the rest 9 ewes (group B) exhibited a delayed estrus. Thyroxin levels rose immediately after ram entrance in animals of group A, but in group Β the increase in thyroid hormone levels was evident only after the first week. The difference in T4 levels between week 0 and 1 for ewes of group A was significantly higher than that observed for animals of group Β (p<005). The pattern of progesterone release was similar between the two groups, but a two week delay in the increase of progesterone concentration was observed in animals of group Β compared to group A. It is concluded that thyroid hormones may act at the beginning of the breeding season to cause a modification in gonadotrophin secretion leading to early ovulation.

scholarly journals Role of thyroid metabolism in vestibular vertigo

2020 ◽  
Vol 6 (2) ◽  
pp. 359
Author(s):  
Anisa . ◽  
Sheetal Rai
Keyword(s):  
Thyroid Hormone ◽  
Thyroid Hormones ◽  
Control Group ◽  
Large Sample Size ◽  
Thyroid Function Tests ◽  
Hormone Levels ◽  
Thyroid Metabolism ◽  
Thyroid Hormone Levels ◽  
Altered Thyroid

<p class="abstract"><strong>Background:</strong> Thyroid hormones play a role in the development and functioning of the inner ear.  Therefore, it was hypothesized that a derangement in the thyroid hormone levels can affect the cochleo-vestibular system.</p><p class="abstract"><strong>Methods:</strong> The present study included 64 cases and 64 controls. All patients diagnosed with peripheral vertigo were enrolled into the study. All the subjects underwent thyroid function tests- serum T3, T4 and thyroid stimulating hormone (TSH). Free hormone levels were obtained in patients with subclinical hypo or hyperthyroidism. The data was analyzed using Independent sample t test.  </p><p class="abstract"><strong>Results:</strong> Out of 64 cases only 10 patients showed altered thyroid values. Fifty-nine cases were diagnosed with benign paroxysmal positional vertigo (BPPV) out of which 9 (15%) had altered thyroid hormone levels. Among the control group, 12 were found to have deranged thyroid hormone levels.</p><p class="abstract"><strong>Conclusions:</strong> There is no association between functional thyroid hormone levels and BPPV. Therefore, altered thyroid metabolism has no role in the causation of vestibular dysfunction due to BPPV. However, in case of Meniere’s disease and Vestibular neuronitis further studies with large sample size are required to ascertain the role of functional thyroid hormones in producing vestibular symptoms.</p>

scholarly journals Role of thyroid dysimmunity and thyroid hormones in endometriosis

2019 ◽  
pp. 201820469
Author(s):  
Marine Peyneau ◽  
Niloufar Kavian ◽  
Sandrine Chouzenoux ◽  
Carole Nicco ◽  
Mohamed Jeljeli ◽  
...  
Keyword(s):  
Thyroid Hormones ◽  
Thyroid Autoimmunity ◽  
Uterine Cavity ◽  
Thyroid Stimulating Hormone ◽  
Thyroid Disorder ◽  
Endometrial Cells ◽  
Thyroid Metabolism ◽  
Ectopic Endometrium

Endometriosis is characterized by the presence of ectopic endometrial cells outside the uterine cavity. Thyroid autoimmunity has been associated with endometriosis. This work investigated the potential pathophysiological link between endometriosis and thyroid disorders. Transcripts and proteins involved in thyroid metabolism are dysregulated in eutopic and ectopic endometrium of endometriotic patients, leading to resistance of ectopic endometrium to triiodothyronine (T3) action and local accumulation of thyroxine (T4). Thyroid-stimulating hormone (TSH) acts as a proliferative and prooxidative hormone on all endometria of endometriosis patients and controls, whereas T3 and T4 act to specifically increase ectopic endometrial cell proliferation and reactive oxygen species (ROS) production. Mouse studies confirmed the data gained in vitro since endometriotic implants were found to be bigger when thyroid hormones increased. A retrospective analysis of endometriosis patients with or without a thyroid disorder revealed an increased chronic pelvic pain and disease score in endometriotic patients with a thyroid disorder.

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