Article

McKay L, Renoir JM, Weigel NL, Wilson EM, McDonnell DP, Cidlowski JA (2006 Dec) International Union of Pharmacology. LXV. The pharmacology and classification of the nuclear receptor superfamily: glucocorticoid, mineralocorticoid, progesterone, and androgen receptors. Pharmacol Rev

Molecular Endocrinology Group, Laboratory of Signal Transduction, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina 27709, USA.
Pharmacological Reviews (Impact Factor: 18.55). 01/2007; 58(4):782-97. DOI: 10.1124/pr.58.4.9
Source: PubMed
Download full-text

Full-text

Available from: Nancy L Weigel, Aug 22, 2015
0 Followers
 · 
171 Views
  • Source
    • "These chemicals include natural and synthetic glucocorticoids (GCs). Synthetic GCs are currently used as pharmaceuticals to treat a wide variety of health conditions in humans and in veterinary medicine including inflammatory and immune diseases, such as asthma, rheumatic disease, inflammatory bowel disease, allergies, and eye and skin diseases (Barnes, 2010; Lu et al., 2006). After consumption, GCs are released into the environment, primarily via wastewater. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Glucocorticoids (GCs) are widely used as anti-inflammatory drugs. Our previous study demonstrated that several GCs such as cortisol and dexamethasone (Dex) were frequently detected in effluents collected from Japanese sewage treatment plants (STPs) in 2012. In this study, we used the GC-Responsive Chemical-Activated LUciferase gene eXpression (GR-CALUX) assay to elucidate GC receptor (GR) agonistic activities of ten pure synthetic GCs and selected STP effluents in Japan for assessment of the risks associated with the presence of GR agonists. The tested GCs demonstrated dose-dependent agonistic effects in the GR-CALUX assay and their EC50 values were calculated for estimation of relative potencies (REPs) compared to Dex. The GR agonistic potency was in the rank of: clobetasol propionate>clobetasone butyrate>betamethasone 17-valerate>difluprednate>betamethasone 17,21-dipropionate>Dex>betamethasone>6α-methylprednisolone>prednisolone>cortisol. The GR agonistic activity in STP effluents as measured in Dex-equivalent (Dex-EQ) activities ranged from <3.0-78ngL(-1) (median: 29ngL(-1), n=50). To evaluate the contribution of the target GCs, theoretical Dex-EQs were calculated by multiplying the concentrations of each GC by its respective REP. Our calculation of Dex-EQ contribution for individual GR agonists indicated that the well-known GCs cortisol and Dex should not be given priority for subsequent in vivo testing, monitoring and removal experiments, but rather the highly potent synthetic GCs clobetasol propionate and betamethasone 17-valerate (REP=28 and 3.1) as well as other unidentified compounds are important GR agonists in STP effluents in Japan. Copyright © 2015 Elsevier B.V. All rights reserved.
    Science of The Total Environment 05/2015; 527-528C:328-334. DOI:10.1016/j.scitotenv.2015.05.008 · 4.10 Impact Factor
    • "Because of their lipophilic properties, glucocorticoids can cross plasma membranes and activate two different intracellular receptors: mineralocorticoid receptors (MRs) and GRs, also known, respectively, as Type I and Type II receptors. MRs and GRs are homologous in their structural domains, which consist of the Nterminal transactivation domain (TAD), the DNA binding domain (DBD), and the C-terminal ligand binding domain (LBD) (Lu et al., 2006). In the absence of ligand, cytoplasmic MRs and GRs are bound to chaperone protein complexes, including heat shock protein 70 (hsp70), heat shock protein 90 (hsp90), and FK506 binding protein 5 (FKBP5) (Grad & Picard, 2007). "
    [Show abstract] [Hide abstract]
    ABSTRACT: A proper response against stressors is critical for survival. In mammals, the stress response is primarily mediated by secretion of glucocorticoids via the hypothalamic-pituitary-adrenocortical (HPA) axis and release of catecholamines through adrenergic neurotransmission. Activation of these pathways results in a quick physical response to the stress and, in adaptive conditions, mediates long-term changes in the brain that lead to the formation of long-term memories of the experience. These long-term memories are an essential adaptive mechanism that allows an animal to effectively face similar demands again. Indeed, a moderate stress level has a strong positive effect on memory and cognition, as a single arousing or moderately stressful event can be remembered for up to a lifetime. Conversely, exposure to extreme, traumatic, or chronic stress can have the opposite effect and cause memory loss, cognitive impairments, and stress-related psychopathologies such as anxiety disorders, depression and post-traumatic stress disorder (PTSD). While more effort has been devoted to the understanding of the effects of the negative effects of chronic stress, much less has been done thus far on the identification of the mechanisms engaged in the brain when stress promotes long-term memory formation. Understanding these mechanisms will provide critical information for use in ameliorating memory processes in both normal and pathological conditions. Here, we will review the role of glucocorticoids and glucocorticoid receptors (GRs) in memory formation and modulation. Furthermore, we will discuss recent findings on the molecular cascade of events underlying the effect of GR activation in adaptive levels of stress that leads to strong, long-lasting memories. Our recent data indicate that the positive effects of GR activation on memory consolidation critically engage the brain-derived neurotrophic factor (BDNF) pathway. We propose and will discuss the hypothesis that stress promotes the formation of strong long-term memories because the activation of hippocampal GRs after learning is coupled to the recruitment of the growth and pro-survival BDNF/cAMP response element-binding protein (CREB) pathway, which is well-know to be a general mechanism required for long-term memory formation. We will then speculate about how these results may explain the negative effects of traumatic or chronic stress on memory and cognitive functions.
    Neurobiology of Learning and Memory 10/2013; 112. DOI:10.1016/j.nlm.2013.09.017 · 4.04 Impact Factor
  • Source
    • "Androgens play a central role in the biology of normal prostate development and prostate cancer progression (Shen & Abate-Shen 2010). These hormones mediate their effects through the action of the androgen receptor (AR), a member of the nuclear receptor superfamily of ligand-activated transcription factors (Brinkmann et al. 1999, Lu et al. 2006, Dehm & Tindall 2007). Following androgen binding, AR dissociates from heat-shock proteins and translocates to the nucleus where it binds to androgen response elements (AREs) of target genes in association with coactivators and corepressors to regulate gene expression (Shang et al. 2002, Heemers & Tindall 2007). "
    [Show abstract] [Hide abstract]
    ABSTRACT: The development and growth of prostate cancer is dependent upon androgens, thus the identification of androgen-regulated genes in prostate cancer cells is vital for defining the mechanisms of prostate cancer development and progression, and developing new markers and targets for prostate cancer treatment. Glycine N-methyltransferase (GNMT) is a S-adenosylmethionine-dependent methyltransferase that has recently been identified as a novel androgen-regulated gene in prostate cancer cells. Although the importance of this protein in prostate cancer progression has been extensively addressed, little is known about the mechanism of its androgen regulation. Here we show that GNMT expression is stimulated by androgen in AR-expressing cells and that the stimulation occurs at the mRNA and protein levels. We have identified an androgen-response element within the first exon of the GNMT gene and show that AR binds to this element in vitro and in vivo. Together, these studies identify GNMT as a direct transcriptional target of the AR. As this is an evolutionarily conserved regulatory element, this highlights androgen regulation as an important feature of GNMT regulation.
    Journal of Molecular Endocrinology 08/2013; 51(3). DOI:10.1530/JME-13-0169 · 3.62 Impact Factor
Show more