scholarly journals Thyroid Hormone and the Neuroglia: Both Source and Target

2011 ◽  
Vol 2011 ◽  
pp. 1-16 ◽  
Author(s):  
Petra Mohácsik ◽  
Anikó Zeöld ◽  
Antonio C. Bianco ◽  
Balázs Gereben
Keyword(s):  
Thyroid Hormone ◽  
Cell Function ◽  
Hormone Regulation ◽  
Mediobasal Hypothalamus ◽  
Iodothyronine Deiodinase ◽  
Neuronal Gene ◽  
Health And Disease ◽  
And Function ◽  
The Brain

Thyroid hormone plays a crucial role in the development and function of the nervous system. In order to bind to its nuclear receptor and regulate gene transcription thyroxine needs to be activated in the brain. This activation occurs via conversion of thyroxine to T3, which is catalyzed by the type 2 iodothyronine deiodinase (D2) in glial cells, in astrocytes, and tanycytes in the mediobasal hypothalamus. We discuss how thyroid hormone affects glial cell function followed by an overview on the fine-tuned regulation of T3 generation by D2 in different glial subtypes. Recent evidence on the direct paracrine impact of glial D2 on neuronal gene expression underlines the importance of glial-neuronal interaction in thyroid hormone regulation as a major regulatory pathway in the brain in health and disease.

scholarly journals Cannabinoids in health and disease: pharmacological potential in metabolic syndrome and neuroinflammation

2018 ◽  
Vol 36 (2) ◽  
Author(s):  
Andrea Mastinu ◽  
Marika Premoli ◽  
Giulia Ferrari-Toninelli ◽  
Simone Tambaro ◽  
Giuseppina Maccarinelli ◽  
...  
Keyword(s):  
Cannabis Sativa ◽  
Cannabinoid Receptor ◽  
Receptor Type ◽  
History Of ◽  
Health And Disease ◽  
Pharmacological Potential ◽  
The Brain ◽  
Synthesis And Degradation

Abstract The use of different natural and/or synthetic preparations of Cannabis sativa is associated with therapeutic strategies for many diseases. Indeed, thanks to the widespread diffusion of the cannabinoidergic system in the brain and in the peripheral districts, its stimulation, or inhibition, regulates many pathophysiological phenomena. In particular, central activation of the cannabinoidergic system modulates the limbic and mesolimbic response which leads to food craving. Moreover, cannabinoid agonists are able to reduce inflammatory response. In this review a brief history of cannabinoids and the protagonists of the endocannabinoidergic system, i.e. synthesis and degradation enzymes and main receptors, will be described. Furthermore, the pharmacological effects of cannabinoids will be outlined. An overview of the involvement of the endocannabinoidergic system in neuroinflammatory and metabolic pathologies will be made. Finally, particular attention will also be given to the new pharmacological entities acting on the two main receptors, cannabinoid receptor type 1 (CB1) and cannabinoid receptor type 2 (CB2), with particular focus on the neuroinflammatory and metabolic mechanisms involved.

scholarly journals Sex Differences and the Influence of Sex Hormones on Cognition through Adulthood and the Aging Process

2018 ◽  
Vol 8 (9) ◽  
pp. 163 ◽  
Author(s):  
Caroline Gurvich ◽  
Kate Hoy ◽  
Natalie Thomas ◽  
Jayashri Kulkarni
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Sex Differences ◽  
Cognitive Functioning ◽  
Sex Hormones ◽  
Reproductive Function ◽  
Health And Disease ◽  
And Function ◽  
The Brain

Hormones of the hypothalamic-pituitary-gonadal (HPG) axis that regulate reproductive function have multiple effects on the development, maintenance and function of the brain. Sex differences in cognitive functioning have been reported in both health and disease, which may be partly attributed to sex hormones. The aim of the current paper was to provide a theoretical review of how sex hormones influence cognitive functioning across the lifespan as well as provide an overview of the literature on sex differences and the role of sex hormones in cognitive decline, specifically in relation to Alzheimer’s disease (AD). A summary of current hormone and sex-based interventions for enhancing cognitive functioning and/or reducing the risk of Alzheimer’s disease is also provided.

Sex Differences Shape Brain Development and Function, in Health and Disease: Policy Implications

2017 ◽  
Vol 5 (1) ◽  
pp. 104-109 ◽  
Author(s):  
Staci D. Bilbo
Keyword(s):  
Sex Differences ◽  
Autism Spectrum ◽  
Policy Implications ◽  
Female Ratio ◽  
Brain Sciences ◽  
Health And Disease ◽  
Fundamental Research ◽  
And Function ◽  
Sex Disparity ◽  
The Brain

Sex differences profoundly impact health and disease. Despite this, the inclusion of females in clinical and fundamental research lags far behind advances in other aspects of medicine, especially in the brain sciences. Regardless of whether neuroscientists are intrinsically interested in sex differences per se, observing a sex disparity in the incidence or presentation of a given neurological disorder provides a significant clue into the neurobiology of that disorder. Autism spectrum disorder (ASD) is one of the most sex-biased disorders, with a 4:1 male-to-female ratio, an important aspect of its etiology and biology that has largely been ignored in the preclinical literature. This article briefly overviews what is known about the sexual differentiation of the developing healthy brain, with a focus on the preclinical literature. This places observed sex differences in neurological disorders such as ASD into the context of known sex differences in neurobiology—along with insight from known sex-specific mechanisms in other systems that impact the brain (e.g., immune system, microbiome). Finally, the article provides recommendations for progress forward.

scholarly journals Induction of Type 2 Iodothyronine Deiodinase in the Mediobasal Hypothalamus by Bacterial Lipopolysaccharide: Role of Corticosterone

Endocrinology ◽  
2008 ◽  
Vol 149 (5) ◽  
pp. 2484-2493 ◽  
Author(s):  
Edith Sánchez ◽  
Praful S. Singru ◽  
Csaba Fekete ◽  
Ronald M. Lechan
Keyword(s):  
Gene Expression ◽  
Third Ventricle ◽  
Significant Rise ◽  
Bacterial Lipopolysaccharide ◽  
Mediobasal Hypothalamus ◽  
Sprague Dawley ◽  
Iodothyronine Deiodinase ◽  
Circulating Levels

To determine whether endotoxin-induced activation of type 2 iodothyronine deiodinase (D2) in the mediobasal hypothalamus is dependent on circulating levels of corticosterone, the effect of bacterial lipopolysaccharide (LPS) on D2 gene expression was studied in adrenalectomized, corticosterone-clamped adult, male, Sprague Dawley rats. In sham-adrenalectomized animals, LPS (250 μg/100 g body weight) increased circulating levels of corticosterone and IL-6, as well as tanycyte D2 mRNA in the mediobasal hypothalamus. Adrenalectomized, corticosterone-clamped animals showed no significant rise in corticosterone after LPS, compared with saline-treated controls but increased IL-6 levels and tanycyte D2 mRNA similar to LPS-treated sham controls. To further clarify the potential role of corticosterone in the regulation of D2 gene expression by LPS, animals were administered high doses of corticosterone to attain levels similar to that observed in the LPS-treated group. No significant increase in D2 mRNA was observed in the mediobasal hypothalamus with the exception of a small subpopulation of cells in the lateral walls of the third ventricle. These data indicate that the LPS-induced increase in D2 mRNA in the mediobasal hypothalamus is largely independent of circulating corticosterone and indicate that mechanisms other than adrenal activation are involved in the regulation of most tanycyte D2-expressing cells by endotoxin.

scholarly journals The Absence of Interleukin 1 Receptor–Related T1/St2 Does Not Affect T Helper Cell Type 2 Development and Its Effector Function

1999 ◽  
Vol 190 (10) ◽  
pp. 1541-1548 ◽  
Author(s):  
Katsuaki Hoshino ◽  
Shin-ichiro Kashiwamura ◽  
Kozo Kuribayashi ◽  
Taku Kodama ◽  
Tohru Tsujimura ◽  
...  
Keyword(s):  
Mast Cells ◽  
Cell Function ◽  
Interleukin 1 ◽  
Orphan Receptor ◽  
Th2 Cells ◽  
Nippostrongylus Brasiliensis ◽  
T Helper ◽  
Th2 Responses ◽  
And Function

T1/ST2, an orphan receptor with homology with the interleukin (IL)-1 receptor family, is expressed constitutively and stably on the surface of T helper type 2 (Th2) cells, but not on Th1 cells. T1/ST2 is also expressed on mast cells, which are critical for Th2-mediated effector responses. To evaluate whether T1/ST2 is required for Th2 responses and mast cell function, we have generated T1/ST2-deficient (T1/ST2−/−) mice and examined the roles of T1/ST2. Naive CD4+ T cells isolated from T1/ST2−/− mice developed to Th2 cells in response to IL-4 in vitro. T1/ST2−/− mice showed normal Th2 responses after infection with the helminthic parasite Nippostrongylus brasiliensis as well as in the mouse model of allergen-induced airway inflammation. In addition, differentiation and function of bone marrow–derived cultured mast cells were unaffected. These findings demonstrate that T1/ST2 does not play an essential role in development and function of Th2 cells and mast cells.

Selenium and iodine deficiencies: effects on brain and brown adipose tissue selenoenzyme activity and expression

1997 ◽  
Vol 155 (2) ◽  
pp. 255-263 ◽  
Author(s):  
JH Mitchell ◽  
F Nicol ◽  
GJ Beckett ◽  
Keyword(s):  
Adipose Tissue ◽  
Thyroid Hormone ◽  
Glutathione Peroxidase ◽  
Brown Adipose Tissue ◽  
Iodine Deficiency ◽  
Uncoupling Protein ◽  
Compensatory Mechanisms ◽  
Iodothyronine Deiodinase ◽  
Brown Adipose ◽  
The Brain

Adequate dietary iodine supplies and thyroid hormones are needed for the development of the central nervous system (CNS) and brown adipose tissue (BAT) function. Decreases in plasma thyroxine (T4) concentrations may increase the requirement for the selenoenzymes types I and II iodothyronine deiodinase (ID-I and ID-II) in the brain and ID-II in BAT to protect against any fall in intracellular 3,3',5 tri-iodothyronine (T3) concentrations in these organs. We have therefore investigated selenoenzyme activity and expression and some developmental markers in brain and BAT of second generation selenium- and iodine-deficient rats. Despite substantial alterations in plasma thyroid hormone concentrations and thyroidal and hepatic selenoprotein expression in selenium and iodine deficiencies, ID-I, cytosolic glutathione peroxidase (cGSHPx) and phospholipid hydroperoxide glutathione peroxidase (phGSHPx) activities and expression remained relatively constant in most brain regions studied. Additionally, brain and pituitary ID-II activities were increased in iodine deficiency regardless of selenium status. This can help maintain tissue T3 concentrations in hypothyroidism. Consistent with this, no significant effects of iodine or selenium deficiency on the development of the brain were observed, as assessed by the activities of marker enzymes. In contrast, BAT from selenium- and iodine deficient rats had impaired thyroid hormone metabolism and less uncoupling protein than in tissue from selenium- and iodine-supplemented animals. Thus, the effects of selenium and iodine deficiency on the brain are limited due to the activation of the compensatory mechanisms but these mechanisms are less effective in BAT.

Sign in / Sign up

Export Citation Format

Share Document