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Lee JH, Meyer EJ, Nenke MA, Falhammar H, Torpy DJ. Corticosteroid-binding globulin (CBG): spatiotemporal distribution of cortisol in sepsis. Trends Endocrinol Metab 2023; 34:181-190. [PMID: 36681594 DOI: 10.1016/j.tem.2023.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 01/02/2023] [Indexed: 01/22/2023]
Abstract
Corticosteroid-binding globulin (CBG) is a 50-60 kDa circulating glycoprotein with high affinity for cortisol. CBG is adapted for sepsis; its cortisol binding is reduced reversibly by pyrexia and acidaemia, and reduced irreversibly by neutrophil elastase (NE) cleavage, converting high cortisol-binding affinity CBG to a low affinity form. These characteristics allow for the targeted delivery of immunomodulatory cortisol to tissues at the time and body site where cortisol is required in sepsis and septic shock. In addition, high titer inflammatory cytokines in sepsis suppress CBG hepatic synthesis, increasing the serum free cortisol fraction. Recent clinical studies have highlighted the importance of CBG in septic shock, with CBG deficiency independently associated with mortality.
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Affiliation(s)
- Jessica H Lee
- Department of Medicine, University of Adelaide, Adelaide, South Australia, Australia
| | - Emily J Meyer
- Department of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia; Department of Endocrine and Diabetes, The Queen Elizabeth Hospital, Woodville South, South Australia, Australia
| | - Marne A Nenke
- Department of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia; Department of Endocrine and Diabetes, The Queen Elizabeth Hospital, Woodville South, South Australia, Australia
| | - Henrik Falhammar
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden; Department of Endocrinology, Karolinska University Hospital, Stockholm, Sweden.
| | - David J Torpy
- Department of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia
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2
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Prohaska A, Jirikowski GF, Oehring H, El Emam Dief A, Sivukhina EV. Light and electron microscopic studies on the influence of stress on prolactin-immunoreactivity in rat anterior pituitary lobe. Anat Histol Embryol 2022; 51:786-792. [PMID: 36030501 DOI: 10.1111/ahe.12857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Accepted: 08/18/2022] [Indexed: 12/24/2022]
Abstract
An increasing number of evidence suggests an important role of prolactin in the modulation of stress response. However, the mechanisms of its action on the HPA axis are not yet understood. Glucocorticoids, liberated from adrenal cortex due to hormonal signals from pituitary corticotrophs are known to play a key role in systemic stress response. Previously we found evidence that corticosteroid-binding globulin (CBG) is involved in rapid, membrane-mediated actions of adrenal steroids. Here we studied qualitatively immunostainings for prolactin and CBG in pituitaries of male rats that had been subjected to osmotic challenge. We also examined late pregnant, parturient and early lactating rats, assuming that parturition represents a strong physiological stress. We employed double immunofluorescencent staining of semithin sections and immunoelectron microscopy. In stressed males we found increased prolactin immunofluorescence associated with membranes while in controls this staining was predominantly cytoplasmatic. CBG immunofluorescence was found in almost all prolactin cells of stressed males while such double staining was only occasionally observed in controls. Similar observations were made in females: While parturient rats showed intense membrane associated double staining for both antigens, late pregnant and early lactating animals showed patterns similar to that of male controls. Immunoelectron microscopy revealed increased exocytosis of prolactin containing vesicles in lactating rats. CBG was localized on cell membranes and additionally within prolactin vesicles. Our observations suggest prolactin liberation from pituitary lactotrophs along with CBG upon systemic stress response. Membrane effects of glucocorticoids mediated by CBG may be linked to stimulus secretion of prolactin.
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Affiliation(s)
- Antje Prohaska
- Institute of Anatomy, University Hospital Jena, Jena, Germany
| | | | - Hartmut Oehring
- Institute of Anatomy, University Hospital Jena, Jena, Germany
| | - Abeer El Emam Dief
- Department of Medical Physiology, University of Alexandria, Alexandria, Egypt
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3
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Carpena MX, Sánchez-Luquez KY, Martins-Silva T, Santos TM, Farias CP, Leventhal DGP, Berruti B, Zeni CP, Schmitz M, Chazan R, Hutz MH, Salatino-Oliveira A, Genro JP, Rohde LA, Tovo-Rodrigues L. Stress-related genetic components in attention-deficit/hyperactivity disorder (ADHD): Effects of the SERPINA6 and SERPINA1 genetic markers in a family-based brazilian sample. J Psychiatr Res 2022; 149:1-9. [PMID: 35217314 DOI: 10.1016/j.jpsychires.2022.02.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 01/20/2022] [Accepted: 02/14/2022] [Indexed: 11/19/2022]
Abstract
SERPINA6 and SERPINA1 were recently identified as the main genes associated with plasma cortisol concentration in humans. Although dysregulation in the Hypothalamus-Pituitary-Adrenal (HPA) axis has been observed in Attention Deficit/Hyperactivity Disorder (ADHD), the molecular mechanisms underlying this relationship are still unclear. Evaluation of the SERPINA6/SERPINA1 gene cluster in ADHD may provide relevant information to uncover them. We tested the association between the SERPINA6/SERPINA1 locus, including 95 single nucleotide polymorphisms (SNPs), and ADHD, using data from a Brazilian clinical sample of 259 ADHD probands and their parents. The single SNP association was tested using binary logistic regression, and we performed Classification and Regression Tree (CART) analysis to evaluate genotype combinations' effects on ADHD susceptibility. We assessed SNPs' regulatory effects through the Genotype-Tissue Expression (GTEx) v8 tool, and performed a complementary look-up analysis in the largest ADHD GWAS to date. There was a suggestive association between ADHD and eight variants located in the SERPINA6 region and one in the intergenic region between SERPINA6 and SERPINA1 after correction for multiple tests (p < 0.032). CART analysis showed that the combined effects of genotype GG in rs2144833 and CC in rs10129500 were associated with ADHD (OR = 1.78; CI95% = 1.24-2.55). The GTEx assigned the SNPs as eQTLs for genes in different tissues, including SERPINA6, and the look-up analysis revealed two SNPs associated with ADHD. These results suggest a shared genetic component between cortisol levels and ADHD. HPA dysregulation/altered stress response in ADHD might be mediated by upregulation of corticosteroid binding globulin (CBG, encoded by SERPINA6) expression.
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Affiliation(s)
- Marina Xavier Carpena
- Post-graduate Program in Epidemiology, Federal University of Pelotas, Mal. Deodoro Street 1160, 3rd Floor, Pelotas, RS, Brazil; Developmental Disorders Program, CCBS, Center of Biological Science and Health, Mackenzie Presbyterian University, Consolação Street, 896 - Building 28, 1st Floor - Consolação, São Paulo, SP, 01302-907, Brazil
| | - Karen Yumaira Sánchez-Luquez
- Post-graduate Program in Epidemiology, Federal University of Pelotas, Mal. Deodoro Street 1160, 3rd Floor, Pelotas, RS, Brazil
| | - Thais Martins-Silva
- Post-graduate Program in Epidemiology, Federal University of Pelotas, Mal. Deodoro Street 1160, 3rd Floor, Pelotas, RS, Brazil; Human Development and Violence Research Centre (DOVE), Mal. Deodoro Street, 1160 - 3rd Floor, Pelotas, 96020-220, Brazil
| | - Thiago M Santos
- International Center for Equity in Health, Federal University of Pelotas, Mal. Deodoro Street 1160, 3rd Floor, Pelotas, RS, Brazil
| | - Cid Pinheiro Farias
- Post-graduate Program in Epidemiology, Federal University of Pelotas, Mal. Deodoro Street 1160, 3rd Floor, Pelotas, RS, Brazil
| | - Daniel Gray Paschoal Leventhal
- International Center for Equity in Health, Federal University of Pelotas, Mal. Deodoro Street 1160, 3rd Floor, Pelotas, RS, Brazil
| | - Barbara Berruti
- Post-graduate Program in Epidemiology, Federal University of Pelotas, Mal. Deodoro Street 1160, 3rd Floor, Pelotas, RS, Brazil
| | - Cristian Patrick Zeni
- McGovern Medical School, University of Texas Health Science Center at Houston, 1941 East Road, Suite 2100, Houston, TX, 77054, USA
| | - Marcelo Schmitz
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande Do Sul, Ramiro Barcelos Street, 400N - Room 2201(a), 2nd Floor - Santana, Porto Alegre, Rio Grande do Sul, 90035-903, Brazil
| | - Rodrigo Chazan
- Federal University of Rio Grande Do Sul, Post-graduate Program in Psychiatry and Behavioral Sciences, Ramiro Barcelos Street, 2400 - 2nd Floor - Floresta, Porto Alegre, Rio Grande do Sul, 90035-007, Brazil
| | - Mara H Hutz
- Post-graduate Program in Genetics and Molecular Biology, Federal University of Rio Grande Do Sul, Vale Campus, 9500 Bento Gonçalves Ave. - Building 43312M, Porto Alegre, RS, Brazil
| | - Angélica Salatino-Oliveira
- Post-graduate Program in Genetics and Molecular Biology, Federal University of Rio Grande Do Sul, Vale Campus, 9500 Bento Gonçalves Ave. - Building 43312M, Porto Alegre, RS, Brazil
| | - Julia P Genro
- Post-graduate Program in Biosciences, Federal University of Health Sciences of Porto Alegre (UFCSPA), Sarmento Leite Street, 245 - Centro Histórico, Porto Alegre, RS, 90050-170, Brazil
| | - Luis Augusto Rohde
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande Do Sul, Ramiro Barcelos Street, 400N - Room 2201(a), 2nd Floor - Santana, Porto Alegre, Rio Grande do Sul, 90035-903, Brazil; National Institute of Developmental Psychiatry for Children and Adolescents, 785 Dr. Ovídio Pires de Campos Street, 1(st)floor, Room 6, South Wing - Cerqueira Cesar, São Paulo, SP, 05403-010, Brazil
| | - Luciana Tovo-Rodrigues
- Post-graduate Program in Epidemiology, Federal University of Pelotas, Mal. Deodoro Street 1160, 3rd Floor, Pelotas, RS, Brazil.
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Meyer EJ, Spangenberg L, Ramírez MJ, De Sousa SMC, Raggio V, Torpy DJ. CBG Montevideo: A Clinically Novel SERPINA6 Mutation Leading to Haploinsufficiency of Corticosteroid-binding Globulin. J Endocr Soc 2021; 5:bvab115. [PMID: 34308089 PMCID: PMC8294686 DOI: 10.1210/jendso/bvab115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Indexed: 11/22/2022] Open
Abstract
Corticosteroid-binding globulin (CBG) is the main transport protein for cortisol, binding up to 90% in a 1:1 ratio. CBG provides transport of cortisol within the circulation and targeted cortisol tissue delivery. Here, we describe the clinically novel “CBG Montevideo” a SERPINA6 pathogenic variant that results in a 50% reduction in plasma CBG levels. This was associated with low serum total cortisol and clinical features of hypoglycemia, exercise intolerance, chronic fatigue, and hypotension in the proband, a 7-year-old boy, and his affected mother. Previous reports of 9 human CBG genetic variants affecting either CBG concentrations or reduced CBG-cortisol binding properties have outlined symptoms consistent with attenuated features of hypocortisolism, fatigue, and hypotension. Here, however, the presence of hypoglycemia, despite normal circulating free cortisol, suggests a specific role for CBG in effecting glucocorticoid function, perhaps involving cortisol-mediated hepatic glucose homeostasis and cortisol-brain communication.
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Affiliation(s)
- Emily Jane Meyer
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, SA 5000, Australia.,Endocrine and Diabetes Services, The Queen Elizabeth Hospital, Woodville, SA 5011, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, SA 5000, Australia
| | - Lucía Spangenberg
- Bioinformatics Unit, Institut Pasteur de Montevideo, Montevideo, 11400, Uruguay.,Department of Informatics and Computer Science, Universidad Católica del Uruguay, Montevideo, 11600, Uruguay
| | - Maria José Ramírez
- Paediatric Endocrinology, Hospital Británico, Montevideo, 11600, Uruguay.,Paediatric Endocrinology, Centro Hospitalario Pereira Rossell, Montevideo, 11600, Uruguay
| | - Sunita Maria Christina De Sousa
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, SA 5000, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, SA 5000, Australia.,South Australian Adult Genetics Unit, Royal Adelaide Hospital, Adelaide, SA 5000, Australia
| | - Victor Raggio
- Genetics Department, Facultad de Medicina, UDELAR, Montevideo, 11800, Uruguay
| | - David James Torpy
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, SA 5000, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, SA 5000, Australia
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5
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Corticosteroid-binding-globulin (CBG)-deficient mice show high pY216-GSK3β and phosphorylated-Tau levels in the hippocampus. PLoS One 2021; 16:e0246930. [PMID: 33592009 PMCID: PMC7886218 DOI: 10.1371/journal.pone.0246930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 01/28/2021] [Indexed: 12/16/2022] Open
Abstract
Corticosteroid-binding globulin (CBG) is the specific carrier of circulating glucocorticoids, but evidence suggests that it also plays an active role in modulating tissue glucocorticoid activity. CBG polymorphisms affecting its expression or affinity for glucocorticoids are associated with chronic pain, chronic fatigue, headaches, depression, hypotension, and obesity with an altered hypothalamic pituitary adrenal axis. CBG has been localized in hippocampus of humans and rodents, a brain area where glucocorticoids have an important regulatory role. However, the specific CBG function in the hippocampus is yet to be established. The aim of this study was to investigate the effect of the absence of CBG on hippocampal glucocorticoid levels and determine whether pathways regulated by glucocorticoids would be altered. We used cbg-/- mice, which display low total-corticosterone and high free-corticosterone blood levels at the nadir of corticosterone secretion (morning) and at rest to evaluate the hippocampus for total- and free-corticosterone levels; 11β-hydroxysteroid dehydrogenase expression and activity; the expression of key proteins involved in glucocorticoid activity and insulin signaling; microtubule-associated protein tau phosphorylation, and neuronal and synaptic function markers. Our results revealed that at the nadir of corticosterone secretion in the resting state the cbg-/- mouse hippocampus exhibited slightly elevated levels of free-corticosterone, diminished FK506 binding protein 5 expression, increased corticosterone downstream effectors and altered MAPK and PI3K pathway with increased pY216-GSK3β and phosphorylated tau. Taken together, these results indicate that CBG deficiency triggers metabolic imbalance which could lead to damage and long-term neurological pathologies.
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6
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Sivukhina EV, Jirikowski GF. Osmotic stress induces corticosteroid-binding globulin expression in the rat hypothalamo-hypophyseal system. J Chem Neuroanat 2019; 96:57-65. [DOI: 10.1016/j.jchemneu.2018.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 12/20/2018] [Accepted: 12/20/2018] [Indexed: 11/15/2022]
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7
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Rodewald A, Mills D, Gebhart VM, Jirikowski GF. Steroidal pheromones and their potential target sites in the vomeronasal organ. Steroids 2019; 142:14-20. [PMID: 28962851 DOI: 10.1016/j.steroids.2017.09.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 09/12/2017] [Accepted: 09/22/2017] [Indexed: 11/19/2022]
Abstract
Steroids are important olfactory signals in most mammalian species. The vomeronasal organ has been suspected to be the primary target of pheromones. In rat vomeronasal sensory neurons express steroid binding proteins and nuclear receptors. Some binding globulins were found also in single ciliated cells of the non-sensory vomeronasal epithelium. Immunoelectron microscopy revealed VDR in olfactory microvilli and DPB in apical membrane protrusions of supporting sells within the sensory epithelium. Pilot behavioral studies with dogs showed increased sniffing duration upon exposure to low concentrations of vitamin D while higher concentrations were less effective. It has been shown that vitamin D has pheromone-like properties in lizards. Our histochemical and behavioral observations indicate that the mammalian vomeronasal organ may be a vitamin D target. Olfactory functions of vitamin D involve most likely rapid membrane mediated effects rather than actions through nuclear receptors.
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Affiliation(s)
- Andrea Rodewald
- Institute of Anatomy II, University Hospital, Jena, Germany.
| | - Daniel Mills
- School of Life Science, University of Lincoln, UK
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8
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Walker LC, Lawrence AJ. Investigational drug therapies in phase I and phase II clinical trials for alcohol use disorders. Expert Opin Investig Drugs 2018; 27:1-14. [PMID: 30019949 DOI: 10.1080/13543784.2018.1502269] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Alcohol use disorder (AUD) is a complex psychiatric condition characterized by craving, compulsive seeking, loss of control of alcohol consumption as well as the emergence of negative emotional states during withdrawal. Despite the large socioeconomic burden of AUD, therapeutic treatment options lag behind. AREAS COVERED This review covers pharmacotherapies currently in phase I/II clinical trials for the treatment of AUDs listed on clinicaltrials.gov. We discuss drug therapies that modulate monoamine, GABA/Glutamate, neuropeptide and neuroimmune systems. We examine in depth preclinical and clinical evidence of a select range of these compounds and consider their utility in treating AUDs. EXPERT OPINION Current therapeutic options to treat AUD are inadequate at a population level. Currently there are 30 different compounds and one compound combination in phase I/II clinical trials for AUD. These compounds target various aspects of neurotransmitter signaling, neuroimmune modulation, and alcohol metabolism. Almost 75% of these compounds under trial are Food and Drug Administration (FDA) approved for other indications, which may save time and costs in treatment development. Further, development of therapeutics focused on genetic biomarkers and behavioral screening may improve how treatment decisions are made in the future on a case-by-case basis.
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Affiliation(s)
- Leigh C Walker
- a Florey Department of Neuroscience and Mental Health , University of Melbourne , Parkville , VIC , Australia
| | - Andrew J Lawrence
- a Florey Department of Neuroscience and Mental Health , University of Melbourne , Parkville , VIC , Australia
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9
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Nenke MA, Zeng A, Meyer EJ, Lewis JG, Rankin W, Johnston J, Kireta S, Jesudason S, Torpy DJ. Differential Effects of Estrogen on Corticosteroid-Binding Globulin Forms Suggests Reduced Cleavage in Pregnancy. J Endocr Soc 2017; 1:202-210. [PMID: 29264477 PMCID: PMC5686768 DOI: 10.1210/js.2016-1094] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 02/08/2017] [Indexed: 01/09/2023] Open
Abstract
Corticosteroid-binding globulin (CBG) is secreted as high-affinity CBG (haCBG), which may be cleaved by tissue proteases to low-affinity CBG (laCBG), releasing free cortisol. Pregnancy and the estrogen-based combined oral contraceptive pill (COCP) increase CBG concentrations twofold to threefold. The relative effects of these two hyperestrogenic states on the CBG affinity forms are unknown. We performed an observational study in 30 pregnant women, 27 COCP takers and 23 controls. We analyzed circulating total CBG, haCBG, laCBG, and free and total cortisol concentrations. In pregnancy, total CBG and haCBG were increased compared to controls (both P < 0.0001); however, laCBG concentrations were similar. In COCP takers, total CBG and haCBG were increased [802 ± 41 vs compared to controls (both P < 0.0001)], but laCBG was also increased (P = 0.03). Pregnancy and use of COCP were associated with a comparable rise in haCBG, but laCBG was lower in pregnancy (P < 0.0001). These results were consistent with an estrogen-mediated increase in CBG synthesis in both hyperestrogenemic states but with reduced CBG cleavage in pregnancy relative to the COCP, perhaps due to pregnancy-induced CBG glycosylation. Speculatively, increased circulating haCBG concentrations in pregnancy may provide an increased reservoir of CBG-bound cortisol to prepare for the risk of puerperal infection or allow for cortisol binding in the face of competition from increased circulating progesterone concentrations.
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Affiliation(s)
| | - Anna Zeng
- Central and Northern Adelaide Renal Transplantation Service, Centre for Clinical and Experimental Transplantation, Royal Adelaide Hospital.,School of Medicine, University of Adelaide, and
| | | | - John G Lewis
- Steroid and Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand
| | - Wayne Rankin
- Endocrine and Metabolic Unit, and.,School of Medicine, University of Adelaide, and.,Chemical Pathology Directorate, SA Pathology, Adelaide, South Australia 5000, Australia; and
| | - Julie Johnston
- Central and Northern Adelaide Renal Transplantation Service, Centre for Clinical and Experimental Transplantation, Royal Adelaide Hospital
| | - Svjetlana Kireta
- Central and Northern Adelaide Renal Transplantation Service, Centre for Clinical and Experimental Transplantation, Royal Adelaide Hospital
| | - Shilpanjali Jesudason
- Central and Northern Adelaide Renal Transplantation Service, Centre for Clinical and Experimental Transplantation, Royal Adelaide Hospital.,School of Medicine, University of Adelaide, and
| | - David J Torpy
- Endocrine and Metabolic Unit, and.,School of Medicine, University of Adelaide, and
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Sumer-Bayraktar Z, Grant OC, Venkatakrishnan V, Woods RJ, Packer NH, Thaysen-Andersen M. Asn347 Glycosylation of Corticosteroid-binding Globulin Fine-tunes the Host Immune Response by Modulating Proteolysis by Pseudomonas aeruginosa and Neutrophil Elastase. J Biol Chem 2016; 291:17727-42. [PMID: 27339896 PMCID: PMC5016167 DOI: 10.1074/jbc.m116.735258] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 06/10/2016] [Indexed: 12/23/2022] Open
Abstract
Corticosteroid-binding globulin (CBG) delivers anti-inflammatory cortisol to inflamed tissues upon elastase-based proteolysis of the exposed reactive center loop (RCL). However, the molecular mechanisms that regulate the RCL proteolysis by co-existing host and bacterial elastases in inflamed/infected tissues remain unknown. We document that RCL-localized Asn(347) glycosylation fine-tunes the RCL cleavage rate by human neutrophil elastase (NE) and Pseudomonas aeruginosa elastase (PAE) by different mechanisms. NE- and PAE-generated fragments of native and exoglycosidase-treated blood-derived CBG of healthy individuals were monitored by gel electrophoresis and LC-MS/MS to determine the cleavage site(s) and Asn(347) glycosylation as a function of digestion time. The site-specific (Val(344)-Thr(345)) and rapid (seconds to minutes) NE-based RCL proteolysis was significantly antagonized by several volume-enhancing Asn(347) glycan features (i.e. occupancy, triantennary GlcNAc branching, and α1,6-fucosylation) and augmented by Asn(347) NeuAc-type sialylation (all p < 0.05). In contrast, the inefficient (minutes to hours) PAE-based RCL cleavage, which occurred equally well at Thr(345)-Leu(346) and Asn(347)-Leu(348), was abolished by the presence of Asn(347) glycosylation but was enhanced by sialoglycans on neighboring CBG N-sites. Molecular dynamics simulations of various Asn(347) glycoforms of uncleaved CBG indicated that multiple Asn(347) glycan features are modulating the RCL digestion efficiencies by NE/PAE. Finally, high concentrations of cortisol showed weak bacteriostatic effects toward virulent P. aeruginosa, which may explain the low RCL potency of the abundantly secreted PAE during host infection. In conclusion, site-specific CBG N-glycosylation regulates the bioavailability of cortisol in inflamed environments by fine-tuning the RCL proteolysis by endogenous and exogenous elastases. This study offers new molecular insight into host- and pathogen-based manipulation of the human immune system.
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Affiliation(s)
- Zeynep Sumer-Bayraktar
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and
| | - Oliver C Grant
- the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Vignesh Venkatakrishnan
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and
| | - Robert J Woods
- the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Nicolle H Packer
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and
| | - Morten Thaysen-Andersen
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and
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11
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Sivukhina EV, Jirikowski GF. Magnocellular hypothalamic system and its interaction with the hypothalamo-pituitary-adrenal axis. Steroids 2016; 111:21-28. [PMID: 26827626 DOI: 10.1016/j.steroids.2016.01.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 01/18/2016] [Indexed: 01/07/2023]
Abstract
The hypothalamo-neurohypophyseal system plays a key role in maintaining homeostasis and in regulation of numerous adaptive reactions, e.g., endocrine stress response. Nonapeptides vasopressin and oxytocin are the major hormones of this system. They are synthesized by magnocellular neurons of the paraventricular and supraoptic hypothalamic nuclei. Magnocellular vasopressin is known to be one of the main physiological regulators of water-electrolyte balance. Its importance for control of the hypothalamo-pituitary-adrenal axis has been widely described. Magnocellular oxytocin is secreted predominantly during lactation and parturition. The complex actions of oxytocin within the brain include control of reproductive behavior and its involvement in central stress response to different stimuli. It's neuroendocrine basis is activation of the hypothalamo-pituitary-adrenal axis: corticotropin-releasing hormone is synthesized in parvocellular neurons of the paraventricular hypothalamic nuclei. The transitory coexpression of vasopressin in these cells upon stress has been described. Glucocorticoids, the end products of the hypothalamo-pituitary-adrenal axis have both central and peripheral actions. Their availability to target tissues is mainly dependent on systemic levels of corticosteroid-binding globulin. Intrinsic expression of this protein in different brain regions in neurons and glial cells has been recently demonstrated. Regulation of the hypothalamo-pituitary-adrenal axis and hypothalamo-neurohypophyseal system is highly complex. The role of both systems in the pathogenesis of various chronic ailments in humans has extensively been studied. Their disturbed functioning seems to be linked to various psychiatric, autoimmune and cardiovascular pathologies.
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12
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Bray B, Scholl JL, Tu W, Watt MJ, Renner KJ, Forster GL. Amphetamine withdrawal differentially affects hippocampal and peripheral corticosterone levels in response to stress. Brain Res 2016; 1644:278-87. [PMID: 27208490 DOI: 10.1016/j.brainres.2016.05.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 04/20/2016] [Accepted: 05/16/2016] [Indexed: 12/29/2022]
Abstract
Amphetamine withdrawal is associated with heightened anxiety-like behavior, which is directly driven by blunted stress-induced glucocorticoid receptor-dependent serotonin release in the ventral hippocampus. This suggests that glucocorticoid availability in the ventral hippocampus during stress may be reduced during amphetamine withdrawal. Therefore, we tested whether amphetamine withdrawal alters either peripheral or hippocampal corticosterone stress responses. Adult male rats received amphetamine (2.5mg/kg, ip) or saline for 14 days followed by 2 weeks of withdrawal. Contrary to our prediction, microdialysis samples from freely-moving rats revealed that restraint stress-induced corticosterone levels in the ventral hippocampus are enhanced by amphetamine withdrawal relative to controls. In separate groups of rats, plasma corticosterone levels increased immediately after 20min of restraint and decreased to below stress-naïve levels after 1h, indicating negative feedback regulation of corticosterone following stress. However, plasma corticosterone responses were similar in amphetamine-withdrawn and control rats. Neither amphetamine nor stress exposure significantly altered protein expression or enzyme activity of the steroidogenic enzymes 11β-hydroxysteroid dehydrogenase (11β-HSD1) or hexose-6-phosphate dehydrogenase (H6PD) in the ventral hippocampus. Our findings demonstrate for the first time that amphetamine withdrawal potentiates stress-induced corticosterone in the ventral hippocampus, which may contribute to increased behavioral stress sensitivity previously observed during amphetamine withdrawal. However, this is not mediated by either changes in plasma corticosterone or hippocampal steroidogenic enzymes. Establishing enhanced ventral hippocampal corticosterone as a direct cause of greater stress sensitivity may identify the glucocorticoid system as a novel target for treating behavioral symptoms of amphetamine withdrawal.
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Affiliation(s)
- Brenna Bray
- Division of Basic Biomedical Sciences, Center for Brain and Behavior Research, University of South Dakota, 414 East Clark St, Vermillion, SD, United States.
| | - Jamie L Scholl
- Division of Basic Biomedical Sciences, Center for Brain and Behavior Research, University of South Dakota, 414 East Clark St, Vermillion, SD, United States.
| | - Wenyu Tu
- Division of Basic Biomedical Sciences, Center for Brain and Behavior Research, University of South Dakota, 414 East Clark St, Vermillion, SD, United States.
| | - Michael J Watt
- Division of Basic Biomedical Sciences, Center for Brain and Behavior Research, University of South Dakota, 414 East Clark St, Vermillion, SD, United States.
| | - Kenneth J Renner
- Department of Biology, Center for Brain and Behavior Research, University of South Dakota, 414 East Clark St, Vermillion, SD, United States.
| | - Gina L Forster
- Division of Basic Biomedical Sciences, Center for Brain and Behavior Research, University of South Dakota, 414 East Clark St, Vermillion, SD, United States.
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Le-Ha C, Herbison CE, Beilin LJ, Burrows S, Henley DE, Lye SJ, Matthews SG, Pennell CE, Mori TA. Hypothalamic-pituitary-adrenal axis activity under resting conditions and cardiovascular risk factors in adolescents. Psychoneuroendocrinology 2016; 66:118-24. [PMID: 26802599 DOI: 10.1016/j.psyneuen.2016.01.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2015] [Revised: 11/29/2015] [Accepted: 01/05/2016] [Indexed: 02/07/2023]
Abstract
BACKGROUND Activation of the hypothalamic-pituitary-adrenal (HPA) axis has been associated with higher levels of cardiovascular (CVD) risk factors in adults. This study aimed to assess the relation between measures of HPA axis activity under resting conditions and CVD risk factors in a general population of adolescents at 17 years. METHODS A total of 1134 adolescents from the Western Australian Pregnancy Cohort (Raine) Study had phenotypic and socio-demographic data. The associations between HPA axis measures (plasma ACTH, total cortisol, calculated free cortisol, corticosteroid binding globulin (CBG), and salivary cortisol) and a range of cardiovascular risk factors were examined using multivariable linear regression models, with adjustment for gender, adiposity, birth weight, gestational age, and socio-behavioural factors. RESULTS Plasma total cortisol was positively associated with systolic blood pressure (SBP) (p=0.011), total cholesterol, HDL-cholesterol, and triglycerides (all p<0.001), and hs-CRP (p=0.047). Salivary cortisol was associated positively with HDL-C (p=0.033) and negatively with LDL-cholesterol (p=0.016); plasma calculated free cortisol was positively associated with triglycerides (p=0.006); plasma CBG was positively associated with total cholesterol and HDL-cholesterol (both p<0.001), LDL-cholesterol (p=0.022), and hs-CRP (p=0.001). After correction for multiple comparisons, significant associations remained for total cortisol with total cholesterol, HDL-C, and triglycerides; for calculated free cortisol with triglycerides; and for CBG with HDL-C, total cholesterol, and hs-CRP. Plasma ACTH was not associated with any cardiovascular risk factor. There was no association between BMI and any measure of HPA axis activity. CONCLUSION In an adolescent population, HPA axis measures under resting conditions are associated with a range of CVD risk factors. Clarification of the mechanisms underlying these associations in adolescence would be an important step in understanding the evolution of adult CVD.
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Affiliation(s)
- Chi Le-Ha
- School of Medicine and Pharmacology, University of Western Australia, Australia.
| | - Carly E Herbison
- School of Women's and Infant's Health, University of Western Australia
| | - Lawrence J Beilin
- School of Medicine and Pharmacology, University of Western Australia, Australia
| | - Sally Burrows
- School of Medicine and Pharmacology, University of Western Australia, Australia
| | - David E Henley
- School of Medicine and Pharmacology, University of Western Australia, Australia; Department of Endocrinology and Diabetes, Sir Charles Gairdner Hospital, Nedlands, Australia
| | - Stephen J Lye
- Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Canada
| | | | - Craig E Pennell
- School of Women's and Infant's Health, University of Western Australia
| | - Trevor A Mori
- School of Medicine and Pharmacology, University of Western Australia, Australia
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14
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Sivukhina EV, Jirikowski GF. Adrenal steroids in the brain: role of the intrinsic expression of corticosteroid-binding globulin (CBG) in the stress response. Steroids 2014; 81:70-3. [PMID: 24246737 DOI: 10.1016/j.steroids.2013.11.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The complex interaction between hypothalamus, pituitary and adrenal glands is a key component of the neuroendocrine stress response. The major stress hormones--glucocorticoids--have both central and peripheral effects. Among the factors regulating their availability to target tissues are levels of corticosteroid-binding globulin, as the major transport protein for glucocorticoids in systemic circulation. Our recent findings demonstrated expression of corticosteroid-binding globulin in various brain regions and in different cell populations (neurons and glial cells). We showed at the cellular level the presence of corticosteroid-binding globulin in the human hypothalamus, where it was co-localized with the classical neurohypophyseal neurohormones--vasopressin and oxytocin. For the first time we demonstrated in mouse that the same gene encodes brain and liver corticosteroid-binding globulin. The full-length sequencing of hypothalamic corticosteroid-binding globulin revealed a full homology with liver corticosteroid-binding globulin cDNA. Thus, we confirmed that corticosteroid-binding globulin mRNA is produced locally within various cerebral regions and thus not transported from blood. However, the amounts of mRNA encoding corticosteroid-binding globulin are in liver about 200 times higher than in brain. The wide distribution of corticosteroid-binding globulin, distinct from the localization of glucocorticoid receptors, observed in our comparative study in rodents, led us to propose two possibilities: (1) corticosteroid-binding globulin is made in certain neurons to deliver glucocorticoids into the cell and within the cell in the absence of cytoplasmic glucocorticoid receptors or (2) is internalized into neurons specifically to deliver glucocorticoids to classical glucocorticoid receptors. Brain corticosteroid-binding globulin may be involved in the response to changing systemic glucocorticoid levels either additionally to known nuclear and membrane corticosteroid receptors or in glucocorticoid responsive brain regions devoid of these receptors. Clearly the multiple locations of corticosteroid-binding globulin within the central nervous system of humans and rodents imply multiple functional properties in normal and/or pathological conditions, which are yet to be determined. Most likely, the importance of brain corticosteroid-binding globulin exceeds the function of a mere steroid transporter.
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Affiliation(s)
- Elena V Sivukhina
- Institute of Anatomy II, Friedrich-Schiller University Jena, Germany
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15
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Moisan MP, Minni AM, Dominguez G, Helbling JC, Foury A, Henkous N, Dorey R, Béracochéa D. Role of corticosteroid binding globulin in the fast actions of glucocorticoids on the brain. Steroids 2014; 81:109-15. [PMID: 24252379 DOI: 10.1016/j.steroids.2013.10.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Corticosteroid binding globulin (CBG) is a glycoprotein synthesized in liver and secreted in the blood where it binds with a high affinity but low capacity glucocorticoid hormones, cortisol in humans and corticosterone in laboratory rodents. In mammals, 95% of circulating glucocorticoids are bound to either CBG (80%) or albumin (15%) and only the 5% free fraction is able to enter the brain. During stress, the concentration of glucocorticoids rises significantly and the free fraction increases even more because CBG becomes saturated. However, glucocorticoids unbound to CBG are cleared from the blood more quickly. Our studies on mice totally devoid of CBG (Cbg k.o.) showed that during stress these mutant mice display a lower rise of glucocorticoids than the wild-type controls associated with altered emotional reactivity. These data suggested that CBG played a role in the fast actions of glucocorticoids on behavior. Further analyses demonstrated that stress-induced memory retrieval impairment, an example of the fast action of glucocorticoids on the brain is abolished in the Cbg k.o. mice. This effect of stress on memory retrieval could be restored in the Cbg k.o. mice by infusing corticosterone directly in the hippocampus. The mechanisms explaining these effects involved an increased clearance but no difference in corticosterone production. Thus, CBG seems to have an important role in maintaining in blood a glucocorticoid pool that will be able to access the brain for the fast effects of glucocorticoids.
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Affiliation(s)
- M P Moisan
- INRA, Nutrition & Neurobiologie Intégrée (NutriNeuro), UMR 1286, 33076 Bordeaux, France; Univ Bordeaux, Nutrition & Neurobiologie Intégrée (NutriNeuro), UMR 1286, 33076 Bordeaux, France.
| | - A M Minni
- INRA, Nutrition & Neurobiologie Intégrée (NutriNeuro), UMR 1286, 33076 Bordeaux, France; Univ Bordeaux, Nutrition & Neurobiologie Intégrée (NutriNeuro), UMR 1286, 33076 Bordeaux, France
| | - G Dominguez
- CNRS, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), UMR 5287, Universités de Bordeaux1 et 2, 33400 Talence, France; UFR Sciences et Technique, Université de Tours, Parc de Grandmont, 37200 Tours, France
| | - J C Helbling
- INRA, Nutrition & Neurobiologie Intégrée (NutriNeuro), UMR 1286, 33076 Bordeaux, France; Univ Bordeaux, Nutrition & Neurobiologie Intégrée (NutriNeuro), UMR 1286, 33076 Bordeaux, France
| | - A Foury
- INRA, Nutrition & Neurobiologie Intégrée (NutriNeuro), UMR 1286, 33076 Bordeaux, France; Univ Bordeaux, Nutrition & Neurobiologie Intégrée (NutriNeuro), UMR 1286, 33076 Bordeaux, France
| | - N Henkous
- CNRS, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), UMR 5287, Universités de Bordeaux1 et 2, 33400 Talence, France
| | - R Dorey
- CNRS, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), UMR 5287, Universités de Bordeaux1 et 2, 33400 Talence, France
| | - D Béracochéa
- CNRS, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), UMR 5287, Universités de Bordeaux1 et 2, 33400 Talence, France
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16
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Expression of corticosteroid binding globulin in the rat olfactory system. Acta Histochem 2013; 115:376-81. [PMID: 23141917 DOI: 10.1016/j.acthis.2012.09.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 09/24/2012] [Accepted: 09/27/2012] [Indexed: 11/21/2022]
Abstract
Glucocorticoids are known to act on the olfactory system although their mode of action is still unclear since nuclear glucocorticoid receptors are mostly absent in the olfactory mucosa. In this study we used immunocytochemistry, in situ hybridization, and RT-PCR to study the expression and distribution of corticosteroid binding globulin (CBG) in the rat olfactory system. Mucosal goblet cells could be immunostained for CBG. Nasal secretion contained measurable amounts of CBG suggesting that CBG is liberated. CBG immunoreactivity was localized in many of the basal cells of the olfactory mucosa, while mature sensory cells contained CBG only in processes as determined by double immunostaining with the olfactory marker protein OMP. This staining was most pronounced in the vomeronasal organ (VNO). The appearance of CBG in the non-sensory and sensory parts of the VNO and in nerve terminals in the accessory bulb indicated axonal transport. Portions of the periglomerular cells, the mitral cells and the tufted cells were also CBG positive. CBG encoding transcripts were confirmed by RT-PCR in homogenates of the olfactory mucosa and VNO. Olfactory CBG may be significant for uptake, accumulation and transport of glucocorticoids, including aerosolic cortisol.
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17
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Benfield RD, Newton ER, Tanner CJ, Heitkemper MM. Cortisol as a biomarker of stress in term human labor: physiological and methodological issues. Biol Res Nurs 2013; 16:64-71. [PMID: 23338011 DOI: 10.1177/1099800412471580] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Literature on the use of plasma cortisol to quantify psychophysiological stress in humans is extensive. However, in parturition at term gestation, the use of cortisol as a biomarker of stress is particularly complex. Plasma cortisol levels increase as labor progresses. This increase seems to be important for maintenance of maternal/fetal well-being and facilitation of normal labor progress. Unique physiological and methodological issues involved in the use of cortisol as a biomarker of stress in labor present challenges for researchers. This review examines these issues, suggests mixed methods and within-subject repeated measures designs, and offers recommendations for assay procedures for parturient sampling. Documentation of clinical interventions and delivery outcomes may elucidate relationships among psychophysiological stressors, cortisol, and normal labor progress. With attention to these methodological issues, analysis of plasma cortisol may lead to clinical interventions that support normal labor physiology.
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Affiliation(s)
- Rebecca D Benfield
- 1Department of Graduate Nursing Science, College of Nursing, East Carolina University, Greenville, NC, USA
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18
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Reduced density of hypothalamic VGF-immunoreactive neurons in schizophrenia: a potential link to impaired growth factor signaling and energy homeostasis. Eur Arch Psychiatry Clin Neurosci 2012; 262:365-74. [PMID: 22167530 DOI: 10.1007/s00406-011-0282-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Accepted: 12/03/2011] [Indexed: 12/13/2022]
Abstract
Protein expression of VGF (nonacronymic) is induced by nerve/brain-derived growth factor, neurotrophin 3, and insulin. VGF is synthesized by neurons in the paraventricular (PVN) and supraoptic (SON) nuclei of the hypothalamus. After enzymatic processing, smaller VGF-derived peptides are secreted into the cerebrospinal fluid (CSF) or blood. These peptides play important roles by improving synaptic plasticity, neurogenesis, and energy homeostasis, which are impaired in schizophrenia. Based on previous observations of neuroendocrine and hypothalamic deficits in schizophrenia and to determine whether increased levels of the VGF fragment 23-62 in CSF, which have been described in a recent study, were related to changes in hypothalamic VGF expression, an immunohistochemical study was performed in 20 patients with schizophrenia and 19 matched control subjects. N- (D-20) and C-terminal (R-15) VGF antibodies yielded similar results and immunolabeled a vast majority of PVN and SON neurons. Additionally, D20-VGF immunohistochemistry revealed immunostained fibers in the pituitary stalk and neurohypophysis that ended at vessel walls, suggesting axonal transport and VGF secretion. The cell density of D20-VGF-immunoreactive neurons was reduced in the left PVN (P = 0.002) and SON (P = 0.008) of patients with schizophrenia. This study provides the first evidence for diminished hypothalamic VGF levels in schizophrenia, which might suggest increased protein secretion. Our finding was particularly significant in subjects without metabolic syndrome (patients with a body mass index ≤28.7 kg/m(2)). In conclusion, apart from beneficial effects on synaptic plasticity and neurogenesis, VGF may be linked to schizophrenia-related alterations in energy homeostasis.
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19
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Marathe CS, Torpy DJ. A role for corticosteroid-binding globulin variants in stress-related disorders. Expert Rev Endocrinol Metab 2012; 7:301-308. [PMID: 30780848 DOI: 10.1586/eem.12.20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Primary stress-related diseases such as chronic fatigue syndrome, fibromyalgia or chronic widespread pain have been associated with altered activity of the hypothalamic-pituitary-adrenal axis due to measured relative hyper- or hypo-cortisolism in basal or experimentally stimulated states. A hereditary risk to development of these diseases has been proposed. Corticosteroid-binding globulin (CBG), a plasma transport vehicle for cortisol, may play a more active role in the hypothalamic-pituitary-adrenal axis. Chronically altered hypothalamic-pituitary-adrenal axis has been associated with common medical problems. Hypocortisolism has been observed in kindred studies of rare mutations of the SERPIN A6 (CBG) gene and more common SERPIN A6 polymorphisms associated with reduced CBG levels or CBG:cortisol-binding affinity. Over the last decade, studies of five different CBG gene mutations in humans, human genetic associations and transgenic mouse models have suggested that CBG may have hitherto unexpected roles in modulation of the stress response. Naturally occurring CBG variants may alter susceptibility to disorders associated with chronic stress and relative hypocortisolism. On the other hand, hypercortisolism has been linked with Cushing's disease and metabolic syndrome and CBG gene polymorphisms have been linked to obesity in animal models. In this article, we look at the evidence suggesting a role for CBG in stress-related disorders, focusing particularly on CBG gene polymorphisms and chronic pain/fatigue syndromes.
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Affiliation(s)
- Chinmay S Marathe
- a Discipline of Medicine, The University of Adelaide, Royal Adelaide Hospital, Adelaide, Australia
| | - David J Torpy
- b Endocrine & Metabolic Unit, The University of Adelaide, Royal Adelaide Hospital, Adelaide, Australia.
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20
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Sivukhina E, Helbling JC, Minni AM, Schäfer HH, Pallet V, Jirikowski GF, Moisan MP. Intrinsic expression of transcortin in neural cells of the mouse brain: a histochemical and molecular study. J Exp Biol 2012; 216:245-52. [DOI: 10.1242/jeb.076893] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Summary
Corticosteroid binding globulin (CBG, transcortin) has been shown to be expressed in the brain of rat and human species. In this study we examined the CBG brain expression and cDNA structure in mice, comparing wild-type (Cbg+/+) and Cbg knockout mice (Cbg-/-, obtained by genetic disruption of the SerpinA6 alias Cbg gene). We used double immunofluorescence labelling with specific neuronal and glial markers to analyze the cellular localization of CBG in various regions of the mouse brain. In wild-type (Cbg+/+) mice we found CBG immunoreactivity in neuronal perikarya of the magnocellular hypothalamic nuclei, amygdala, hippocampus, cerebral cortex, cerebellum and pituitary. A portion of glial cells (astrocytes, oligodendrocytes) contained CBG immunoreactivity, including some of the ependymal cells and choroid plexus cells. No CBG immunoreactivity was detected in Cbg-/- brain tissues. We showed by RT-PCR that the full-length Cbg mRNA is present in those regions, indicating an intrinsic expression of the steroid-binding globulin. Furthermore, we found by sequencing analysis that Cbg cDNA obtained from the mouse hypothalamus was homologous to Cbg cDNA obtained from the liver. Finally, we have evaluated the relative levels of CBG expression by quantitative PCR in various brain regions and in the liver. We found that brain levels of Cbg mRNA are low compared to the liver but significantly higher than in CBG-deficient mice. Although derived from the same gene than liver CBG, brain CBG protein may play a specific or complementary role that requires the production and analysis of brain-specific Cbg knockout models.
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Affiliation(s)
- Elena Sivukhina
- Institute of Anatomy II, Friedrich-Schiller University, Germany
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21
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Lewis JG, Elder PA. Corticosteroid-binding globulin reactive centre loop antibodies recognise only the intact natured protein: elastase cleaved and uncleaved CBG may coexist in circulation. J Steroid Biochem Mol Biol 2011; 127:289-94. [PMID: 21875666 DOI: 10.1016/j.jsbmb.2011.08.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Revised: 08/01/2011] [Accepted: 08/08/2011] [Indexed: 11/22/2022]
Abstract
Corticosteroid-binding globulin (CBG) is the principal carrier of cortisol in circulation and is a non-inhibitory member of the serpin family of serine proteinase inhibitors. It possesses an exposed elastase specific site which, when cleaved, allows a conformational change promoting the delivery of cortisol to sites of inflammation. Previously there was no ability to independently distinguish between the uncleaved, stressed, conformer of CBG and total CBG in circulation. Here we raised and characterized monoclonal antibodies generated against a synthetic peptide spanning the elastase cleavage site within the exposed reactive centre loop (RCL) and measured changes in CBG by ELISA following treatment with human neutrophil elastase. The antibodies recognized the synthetic peptide as well as intact CBG and the epitope (STGVTLNL) spanned the elastase cleavage site. Treatment of plasma with elastase resulted in a complete loss of CBG levels determined using these RCL antibodies whereas CBG levels measured with an unrelated CBG monoclonal antibody were unaffected. We also compared plasma levels of CBG measured by RCL antibodies and an unrelated CBG antibody and showed discordance in some samples. This study shows for the first time the ability to measure the intact, stressed conformer of CBG. We report discordance with total CBG in some samples implying the presence of cleaved CBG in circulation. This is an important finding as it has implications for free cortisol which hitherto have been determined from total cortisol and total CBG levels. This antibody could be used for determining the time course of intact CBG in various relevant patient cohorts and for structure/function studies on the biology of human CBG.
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Affiliation(s)
- John G Lewis
- Steroid & Immunobiochemistry Laboratory, Canterbury Health Laboratories, PO Box 151, Christchurch, New Zealand.
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22
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New insights into corticosteroid-binding globulin and glucocorticoid delivery. Neuroscience 2011; 180:1-8. [DOI: 10.1016/j.neuroscience.2011.02.053] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Revised: 02/08/2011] [Accepted: 02/19/2011] [Indexed: 12/23/2022]
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23
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Malisch JL, Breuner CW. Steroid-binding proteins and free steroids in birds. Mol Cell Endocrinol 2010; 316:42-52. [PMID: 19786069 DOI: 10.1016/j.mce.2009.09.019] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Revised: 09/18/2009] [Accepted: 09/18/2009] [Indexed: 11/16/2022]
Abstract
Within the comparative literature, corticosteroid-binding globulin (CBG) has recently emerged as a potential modulator of the glucocorticoids-driven stress response. Many avian field studies include the measurement of CBG with the goal of making behavioral and ecological inferences. However, the field of stress physiology is divided on how to interpret the biological importance of the different states of circulating hormones. Here we review evidence for the biological relevance of each fraction of glucocorticoid hormone; the CBG-glucocorticoid complex (the bound fraction) and the remainder which is either unbound or loosely attached to albumin (the free fraction). We suggest that the biological importance of free vs. bound hormone depends on the location of interest (plasma or tissues), and the time frame of interest (current or future need). While a large body of evidence suggests that free hormones are the biologically active fraction, evidence also suggests that the bound fraction is a biologically relevant reservoir of glucocorticoids. We review two salient topics from the avian stress literature; stress-induced decreases in CBG capacity and glucocorticoid influences in life history strategies. These topics are discussed with an emphasis on free vs. bound hormone concentration and how that compares to current vs. future glucocorticoid needs.
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Affiliation(s)
- Jessica L Malisch
- Organismal Biology and Ecology, University of Montana, Missoula, MT 59812, USA.
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24
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Gagliardi L, Ho JT, Torpy DJ. Corticosteroid-binding globulin: the clinical significance of altered levels and heritable mutations. Mol Cell Endocrinol 2010; 316:24-34. [PMID: 19643166 DOI: 10.1016/j.mce.2009.07.015] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Revised: 07/15/2009] [Accepted: 07/15/2009] [Indexed: 02/05/2023]
Abstract
Corticosteroid-binding globulin (CBG) is the specific high-affinity plasma transport glycoprotein for cortisol. Stress-induced falls in CBG levels may heighten hypothalamic-pituitary-adrenal axis responses and CBG:tissue interactions may allow targeted cortisol delivery. Three genetic variants of CBG have been identified that reduce cortisol binding affinity and/or CBG levels. These include the Leuven and Lyon mutations which reduce CBG:cortisol binding affinity 3- and 4-fold, respectively, and the null mutation resulting in a 50% (heterozygote) or 100% (homozygote) reduction in CBG levels. The three reported null homozygotes demonstrate that complete CBG deficiency is not lethal, although it may be associated with hypotension and fatigue. The phenotype of a CBG null murine model included fatigue and immune defects. One community-based study revealed that severe CBG mutations are rare in idiopathic fatigue disorders. The mechanisms by which CBG mutations may cause fatigue are unknown. There are preliminary data of altered CBG levels in hypertension and in the metabolic syndrome; however, the nature of these associations is uncertain. Further studies may clarify the functions of CBG, and clinical observations may validate and/or extend the phenotypic features of various CBG mutations.
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Affiliation(s)
- Lucia Gagliardi
- School of Medicine, University of Adelaide, Adelaide, SA 5005, Australia
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25
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Pusch L, Wegmann S, Caldwell JD, Jirikowski GF. Expression of corticosteroid-binding globulin in human astrocytoma cell line. Cell Mol Neurobiol 2009; 29:583-8. [PMID: 19172388 DOI: 10.1007/s10571-009-9350-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2008] [Accepted: 01/08/2009] [Indexed: 11/25/2022]
Abstract
Glial tumor cells are known to be sensitive to glucocorticoids (GC) in vivo and in vitro. Here we studied the expression of corticosteroid-binding globulin (CBG) in the low-grade malignant human astrocytoma cell line 1321N1. CBG was observed in cytoplasm of most of these cells with immunocytochemistry. RT-PCR revealed the presence of the respective mRNA. Only scattered cells contained nuclear immunoreactivity for glucocorticoid receptor as visualized by double immunostaining. Immunoreactive CBG could be recovered from the supernatant of cultures that had been exposed to 10(-5) M cortisol. Our observations indicate the endogenous expression of CBG in 1321N1 cells which may occur independently from classical glucocorticoid receptor pathways. Cortisol seems to facilitate liberation of CBG in a paracrine manner, perhaps through membrane action of the steroid. Effects of adrenal steroids on proliferation and apoptosis of certain glial tumors may in part depend on these mechanisms.
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Affiliation(s)
- Larissa Pusch
- Inst für Anatomie II, Friedrich Schiller Universität Jena, Jena, Germany
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26
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Kumsta R, Entringer S, Hellhammer DH, Wüst S. Cortisol and ACTH responses to psychosocial stress are modulated by corticosteroid binding globulin levels. Psychoneuroendocrinology 2007; 32:1153-7. [PMID: 17904296 DOI: 10.1016/j.psyneuen.2007.08.007] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2007] [Revised: 08/15/2007] [Accepted: 08/16/2007] [Indexed: 11/16/2022]
Abstract
The hypothalamus-pituitary-adrenal (HPA) axis is vital for an organisms' response to physiological and psychological stress. Cortisol, secreted upon activation of the HPA axis, impacts on physiological systems throughout the organism. Responses to cortisol are influenced and modified by a number of factors, including corticosteroid binding globulin (CBG) levels. A major part of circulating cortisol is bound to CBG and only the unbound fraction is thought to be biologically active. The aim of the present study was to examine the modulating effect of CBG levels on hormonal responses following psychosocial stress in women using oral contraceptives (n=115) and in medication-free men (n=93). In women, CBG levels were negatively associated with ACTH and salivary cortisol and positively with total cortisol levels following the TSST. In men, positive associations were observed between CBG and ACTH and total cortisol levels following the TSST. CBG is an important regulatory element of HPA axis response patterns; therefore, CBG levels have to be taken into account as a potential modifier of ACTH and cortisol responses to psychosocial and pharmacological stimulation. Investigations of the consequences of long-lasting OC intake on the neuroendocrine stress regulation in women might be warranted.
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Affiliation(s)
- R Kumsta
- Department of Theoretical and Clinical Psychobiology, University of Trier, Johanniterufer 15, 54290 Trier, Germany
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Jirikowski GF, Pusch L, Möpert B, Herbert Z, Caldwell JD. Expression of corticosteroid binding globulin in the rat central nervous system. J Chem Neuroanat 2007; 34:22-8. [PMID: 17467234 DOI: 10.1016/j.jchemneu.2007.03.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2007] [Revised: 03/27/2007] [Accepted: 03/27/2007] [Indexed: 01/27/2023]
Abstract
Immunoreactivity for corticosteroid binding globulin was observed in the hypothalamus of intact male rats in the magnocellular nuclei and in single neurons in the periventricular nucleus and the lateral hypothalamus. The suprachiasmatic and the arcuate nuclei contained parvocellular neurons with specific immunoreactivity. Extensive networks of immunopositive fibers were observed in the lateral hypothalamus, the preoptic region, the bed nucleus of the stria terminalis and along the third ventricle. Immunostained axons often exhibited varicosities. The internal and the external layer of the median eminence showed numerous bundles of immunostained axons. Herring bodies in the posterior pituitary lobe contained specific immunoreactivity while pituicytes remained unstained. A portion of the Purkinje cells in the cerebellum and mossy fibers in the cerebellar granular layer stained for corticosteroid binding globulin. Some of the pyramidal cells in the hippocampus were corticosteroid binding globulin positive. Immunostained fibers occurred in the mesencephalon in the periaqueductal grey and in the medulla oblongata. A small fraction of the ependymal cells was also stained. In the spinal cord we observed specific immunoreactivity in a portion of the neurons in the dorsal horn. With polymerase chain reaction we confirmed the presence of the respective transcripts in the different brain regions. The multiple locations of corticosteroid binding globulin throughout the central nervous system suggest multiple functional properties, including neuroendocrine and neurohumoral functions.
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Affiliation(s)
- G F Jirikowski
- Department of Anatomy II, Friedrich Schiller Universität, Jena, Germany.
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Bibliography. Current world literature. Adrenal cortex. Curr Opin Endocrinol Diabetes Obes 2007; 14:255-9. [PMID: 17940448 DOI: 10.1097/med.0b013e3281de7489] [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: 11/27/2022]
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Caldwell JD, Shapiro RA, Jirikowski GF, Suleman F. Internalization of sex hormone-binding globulin into neurons and brain cells in vitro and in vivo. Neuroendocrinology 2007; 86:84-93. [PMID: 17684316 DOI: 10.1159/000107072] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2006] [Accepted: 06/04/2007] [Indexed: 11/19/2022]
Abstract
BACKGROUND Sex hormone-binding globulin (SHBG) is a 94-kDa homodimer that binds steroids and is made in the hypothalamus. We have demonstrated that infusions of SHBG into the hypothalami of rats increase their female sexual receptivity except when SHBG is coupled to dihydrotestosterone (DHT) suggesting that SHBG has an active function in behavioral neuroendocrinology. METHODS This study examines the possibility that SHBG is internalized by neuronal and/or non-neuronal brain cells as one possible mode of action using in vitro and in vivo techniques. RESULTS First, analysis of the uptake of radiolabeled SHBG ((125)I-SHBG) found (125)I-SHBG uptake in HT22 hippocampal cells stably transfected with cDNA for ER beta (HT22-ER beta). The addition of DHT to (125)I-SHBG significantly inhibited (125)I-SHBG uptake in HT22-ER beta cells but not in HT22-ER alpha or HT22 wild-type cells. SHBG internalization was specific as it did not occur in either the human neuroblastoma cell line SK-N-SH or the glioma cell line C6. Second, SHBG was labeled with a fluor (Alexa-555), and infused into the lateral cerebroventricles of ovariectomized rats. Optimal SHBG uptake was seen 10 min after these infusions. SHBG uptake was seen in specific parts of the choroid plexus and periventricular cells as well as into cells in the paraventricular nucleus, the medial forebrain bundle, and the habenula. CONCLUSIONS These studies suggest that SHBG is internalized by brain cells, which may be affected by the presence of ER beta. The gonadal steroids have numerous effects in brain and the discovery that the steroid-binding protein SHBG is taken up into neurons and brain cells may demand a change in thinking about how steroids are delivered to brain cells to affect neurophysiology.
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Affiliation(s)
- J D Caldwell
- Department of Biomedical Sciences, University of Illinois College of Medicine, Rockford, IL, USA.
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