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Zhang H, Liu C, Liu Y, Gai Z. Establishment of human induced pluripotent stem cell line SDQLCHi029-A from one Type 1 familial glucocorticoid deficiency patient carrying compound heterozygote mutations in MC2R gene. Stem Cell Res 2024; 76:103368. [PMID: 38430736 DOI: 10.1016/j.scr.2024.103368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 02/08/2024] [Accepted: 02/25/2024] [Indexed: 03/05/2024] Open
Abstract
Type 1 familial glucocorticoid deficiency (FGD) is a rare autosomal recessive disorder due to variation of the melanocortin-2-receptor (MC2R) gene. Induced pluripotent stem cell (iPSC) line SDQLCHi029-A was successfully generated from peripheral blood mononuclear cells obtained from a 5-day-old girl with MC2R mutations (c.428C > T and c.409C > T). The iPSC line showed genetically stable and matched the donor's PBMCs. displayed a normal karyotype, expressed high pluripotent markers, and exhibited differentiation potential of three germ layers in vitro. The iPSC line could be a good model to study the pathogenesis of FGD type 1 and screen new drugs for the disease.
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Affiliation(s)
- Haiyan Zhang
- Pediatric Research Institute, Children's Hospital Affiliated to Shandong University (Jinan Children's Hospital), Jinan, Shandong 250022, China; Department of Neonatology, Children's Hospital Affiliated to Shandong University (Jinan Children's Hospital), Jinan, Shandong 250022, China
| | - Chen Liu
- Department of Neonatology, Children's Hospital Affiliated to Shandong University (Jinan Children's Hospital), Jinan, Shandong 250022, China; Shandong Provincial Clinical Research Center for Children's Health and Disease, Jinan 250022, China
| | - Yi Liu
- Pediatric Research Institute, Children's Hospital Affiliated to Shandong University (Jinan Children's Hospital), Jinan, Shandong 250022, China; Shandong Provincial Clinical Research Center for Children's Health and Disease, Jinan 250022, China
| | - Zhongtao Gai
- Pediatric Research Institute, Children's Hospital Affiliated to Shandong University (Jinan Children's Hospital), Jinan, Shandong 250022, China; Shandong Provincial Clinical Research Center for Children's Health and Disease, Jinan 250022, China
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Gao J, Liu X, Cui Y, Cao B, Chen Y, Wei H, Yang H. [Clinical characteristics and genetic analysis of two children with Familial glucocorticoid deficiency type 1 due to variants of MC2R gene]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2023; 40:1526-1530. [PMID: 37994136 DOI: 10.3760/cma.j.cn511374-20220509-00315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Abstract
OBJECTIVE To improve the recognition of Familial glucocorticoid deficiency type 1 (FGD1) due to variants of melanocortin 2 receptor (MC2R) gene. METHODS Two children with FGD1 diagnosed at the Henan Children's Hospital respectively in 2019 and 2021 were selected as the study subjects. Clinical data, treatment, follow-up and results of genetic testing were collected and retrospectively analyzed. RESULTS Whole exome sequencing revealed that both children had harbored compound heterozygous variants of the MC2R gene, including c.433C>T (p.R145C) and c.710T>C (p.L237P) in child 1, and c.145delG (p.V49Cfs*35) and c.307G>A (p.D103N) in child 2, among which c.710T>C (p.L237P) and c.145delG (p.V49Cfs*35) were unreported previously. CONCLUSION FGD1 is clinically rare, and genetic sequencing is crucial for the definite diagnosis. Discovery of the and novel variants has enriched the mutational spectrum of the FGD1 gene.
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Affiliation(s)
- Jing Gao
- Department of Endocrinology and Inborn Error of Metabolism, Children's Hospital Affiliated to Zhengzhou University, Henan Children's Hospital, Zhengzhou Children's Hospital, Zhengzhou, Henan 450018, China.
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Shaughnessy CA, Le K, Myhre VD, Dores RM. Functional characterization of melanocortin 2 receptor (Mc2r) from a lobe-finned fish (Protopterus annectens) and insights into the molecular evolution of melanocortin receptors. Gen Comp Endocrinol 2023; 343:114356. [PMID: 37562700 DOI: 10.1016/j.ygcen.2023.114356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 07/25/2023] [Accepted: 08/07/2023] [Indexed: 08/12/2023]
Abstract
Recent studies from our group on melanocortin 2 receptors (Mc2r) from basal families of actinopterygians have served to resolve that Mrap1 dependence and ACTH selectivity are features of even the most basal ray-finned fishes. However, there have been no studies on Mc2r function of the basal sarcopterygians, the lobe-finned fishes, represented by the extant members coelacanths and lungfishes. Here, we offer the first molecular and functional characterization of an Mc2r from a lobe-finned fish, the West African lungfish (Protopterus annectens). Plasmids containing cDNA constructs of lungfish (lf) Mc2r and Mrap1 were expressed in mammalian and zebrafish cell lines. Cells were then stimulated by human ACTH(1-24) and melanocyte stimulating hormone (α-MSH), as well as alanine-substituted analogs of hACTH(1-24) targeting residues within the H6F7R8W9 and K15K16R17R18P19 motifs. Activation of lfMc2r was assessed using a cAMP-responsive luciferase reporter gene assay. In these assays, lfMc2r required co-expression with lfMrap1, was selective for ACTH over α-MSH at physiological concentrations of the ligands, and was completely inhibited by multiple-alanine substitutions of the HFRW (A6-9) and KKRRP (A15-19) motifs. Single- and partial-alanine substitutions of the HFRW and KKRRP motifs varied in their impacts on receptor-ligand affinity from having no effect to completely inhibiting lfMc2r activation. This characterization of the Mc2r of a lobe-finned fish fulfills the last major extant vertebrate group for which Mc2r function had yet to be characterized. In doing so, we resolve that all basal bony vertebrate groups exhibit Mc2r function that substantially differs from that of the cartilaginous fishes, indicating that rapid and dramatic shift in Mc2r function occurred between the radiation of cartilaginous fishes and the emergence of bony fishes. We support this interpretation with a molecular clock analysis of the melanocortin receptors, which demonstrates the uniquely high rate of sequence divergence in Mc2r. Much remains to be understood regarding the molecular evolution of Mc2r during the early radiation of vertebrates that resulted in the derived functional characteristics of Mrap1 dependence and exclusive selectivity for ACTH.
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Affiliation(s)
| | - Khoa Le
- Department of Biological Sciences, University of Denver, Denver, CO, USA
| | - Valorie D Myhre
- Department of Biological Sciences, University of Denver, Denver, CO, USA
| | - Robert M Dores
- Department of Biological Sciences, University of Denver, Denver, CO, USA
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Bouyoucos IA, Shaughnessy CA, Gary Anderson W, Dores RM. Molecular and pharmacological analysis of the melanocortin-2 receptor and its accessory proteins Mrap1 and Mrap2 in a Squalomorph shark, the Pacific spiny dogfish. Gen Comp Endocrinol 2023; 342:114342. [PMID: 37454980 DOI: 10.1016/j.ygcen.2023.114342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 07/08/2023] [Accepted: 07/12/2023] [Indexed: 07/18/2023]
Abstract
The hypothalamus-pituitary-adrenal/interrenal (HPA/I) axis is a conserved vertebrate neuroendocrine mechanism regulating the stress response. The penultimate step of the HPA/I axis is the exclusive activation of the melanocortin-2 receptor (Mc2r) by adrenocorticotropic hormone (ACTH), requiring an accessory protein, Mrap1 or Mrap2. Limited data for only three cartilaginous fishes support the hypothesis that Mc2r/Mrap1 function in bony vertebrates is a derived trait. Further, Mc2r/Mrap1 functional properties appear to contrast among cartilaginous fishes (i.e., the holocephalans and elasmobranchs). This study sought to determine whether functional properties of Mc2r/Mrap1 are conserved across elasmobranchs and in contrast to holocephalans. The deduced amino acid sequences of Pacific spiny dogfish (Squalus suckleyi; pd) pdMc2r, pdMrap1, and pdMrap2 were obtained from a de novo transcriptome of the interrenal gland and validated against the S. suckleyi genome. pdMc2r showed high primary sequence similarity with elasmobranch and holocephalan Mc2r except at extracellular domains 1 and 2, and transmembrane domain 5. pdMraps showed similarly high sequence similarity with holocephalan and other elasmobranch Mraps, with all cartilaginous fish Mrap1 orthologs lacking an activation motif. cAMP reporter gene assays demonstrated that pdMc2r requires an Mrap for activation, and can be activated by stingray (sr) ACTH(1-24), srACTH(1-13)NH2 (i.e., α-MSH), and γ-melanocyte-stimulating hormone at physiological concentrations. However, pdMc2r was three orders of magnitude more sensitive to srACTH(1-24) than srACTH(1-13)NH2. Further, pdMc2r was two orders of magnitude more sensitive to srACTH(1-24) when expressed with pdMrap1 than with pdMrap2. These data suggest that functional properties of pdMc2r/pdMrap1 reflect other elasmobranchs and contrast what is seen in holocephalans.
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Affiliation(s)
- Ian A Bouyoucos
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada; Bamfield Marine Sciences Centre, Bamfield, BC V0R 1B0, Canada.
| | | | - W Gary Anderson
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada; Bamfield Marine Sciences Centre, Bamfield, BC V0R 1B0, Canada
| | - Robert M Dores
- Department of Biological Sciences, University of Denver, Denver, CO 80208, USA
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Liu S, Zeng T, Luo C, Peng D, Xu X, Liu Q, Wu Q, Lu Q, Huang F. A rare homozygous variant of MC2R gene identified in a Chinese family with familial glucocorticoid deficiency type 1: A case report. Front Endocrinol (Lausanne) 2023; 14:1113234. [PMID: 36909322 PMCID: PMC10003339 DOI: 10.3389/fendo.2023.1113234] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 02/08/2023] [Indexed: 02/26/2023] Open
Abstract
Background Melanocortin-2 receptor (MC2R), a member of the G protein-coupled receptor family, is selectively activated by adrenocorticotropic hormone (ACTH). variants in MC2R are associated with family glucocorticoid deficiency 1 (FGD1). Case presentation We first reported a Chinese family with two affected siblings with a homozygotic variant of c.712C>T/p.H238Y in MC2R, presenting with skin hyperpigmentation, hyperbilirubinemia, and tall stature. These individuals showed novel clinical features, including congenital heart defects, not been found in other FGD1 patients. Conclusions We reported a Chinese family with affected siblings having a homozygotic variant of c.712C>T/p.H238Y in MC2R.Our report may expand the genetic and clinical spectrum of FGD1.
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Affiliation(s)
- ShuPing Liu
- Department of Children’s Medical Center, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China
| | - Ting Zeng
- Department of Children's Health Care, Liuzhou Maternity and Child Healthcare Hospital, Liuzhou, Guangxi, China
| | - Cheng Luo
- Department of Children’s Medical Center, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China
| | - DanXia Peng
- Department of Children’s Medical Center, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China
| | - Xuan Xu
- Department of Children’s Medical Center, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China
| | - Qin Liu
- Department of Children’s Medical Center, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China
| | - Qiong Wu
- Department of Children’s Medical Center, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China
| | - Qin Lu
- Department of Applied and Translational Medicine, GeneMind Biosciences Company Limited, Shenzhen, China
| | - FuRong Huang
- Department of Children’s Medical Center, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, China
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Dores RM, McKinley G, Meyers A, Martin M, Shaughnessy CA. Structure/Function Studies on the Activation Motif of Two Non-Mammalian Mrap1 Orthologs, and Observations on the Phylogeny of Mrap1, Including a Novel Characterization of an Mrap1 from the Chondrostean Fish, Polyodon spathula. Biomolecules 2022; 12:1681. [PMID: 36421695 PMCID: PMC9688151 DOI: 10.3390/biom12111681] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/03/2022] [Accepted: 11/09/2022] [Indexed: 08/12/2023] Open
Abstract
In derived bony vertebrates, activation of the melanocortin-2 receptor (Mc2r) by its ACTH ligand requires chaperoning by the Mc2r accessory protein (Mrap1). The N-terminal domain of the non-mammalian tetrapod MRAP1 from chicken (c; Gallus gallus) has the putative activation motif, W18D19Y20I21, and the N-terminal domain in the neopterygian ray-finned fish Mrap1 from bowfin (bf; Amia calva) has the putative activation motif, Y18D19Y20I21. The current study used an alanine-substitution paradigm to test the hypothesis that only the Y20 position in the Mrap1 ortholog of these non-mammalian vertebrates is required for activation of the respective Mc2r ortholog. Instead, we found that for cMRAP1, single alanine-substitution resulted in a gradient of inhibition of activation (Y20 >> D19 = W18 > I21). For bfMrap1, single alanine-substitution also resulted in a gradient of inhibition of activation (Y20 >> D19 > I21 > Y18). This study also included an analysis of Mc2r activation in an older lineage of ray-finned fish, the paddlefish (p), Polyodon spathula (subclass Chondronstei). Currently no mrap1 gene has been found in the paddlefish genome. When pmc2r was expressed alone in our CHO cell/cAMP reporter gene assay, no activation was observed following stimulation with ACTH. However, when pmc2r was co-expressed with either cmrap1 or bfmrap1 robust dose response curves were generated. These results indicate that the formation of an Mc2r/Mrap1 heterodimer emerged early in the radiation of the bony vertebrates.
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Affiliation(s)
- Robert M. Dores
- Department of Biological Sciences, University of Denver, Denver, CO 80210, USA
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Shaughnessy CA, Jensen MF, Dores RM. A basal actinopterygian melanocortin receptor: Molecular and functional characterization of an Mc2r ortholog from the Senegal bichir (Polypterus senegalus). Gen Comp Endocrinol 2022; 328:114105. [PMID: 35973587 DOI: 10.1016/j.ygcen.2022.114105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/09/2022] [Accepted: 08/11/2022] [Indexed: 12/14/2022]
Abstract
In bony vertebrates, melanocortin 2 receptor (Mc2r) specifically binds adrenocorticotropic hormone (ACTH) and is responsible for mediating anterior pituitary signaling that stimulates corticosteroid production in the adrenal gland/interrenal cells. In bony fishes Mc2r requires the chaperoning of an accessory protein (Mrap1) to traffic to the membrane surface and bind ACTH. Here, we evaluated the structure and pharmacological properties of Mc2r from the Senegal bichir (Polypterus senegalus), which represents the most basal bony fish from which an Mc2r has been pharmacologically studied to date. In our experiments, cDNA constructs of the Mc2r from the Senegal bichir (sbMc2r) and various vertebrate Mrap1s were heterologously co-expressed in Chinese hamster ovary (CHO) cells, stimulated by ACTH or melanocyte-stimulating hormone (α-MSH) ligands, and assessed using a luciferase reporter gene assay. When expressed without an Mrap1, sbMc2r was not activated by ACTH. When co-expressed with Mrap1 from either chicken (Gallus gallus) or bowfin (Amia calva), sbMc2r could be activated in a dose-dependent manner by ACTH, but not α-MSH. Co-expression of sbMrap2 with sbMc2r resulted in no detectable activation of the receptor. Collectively, these results demonstrate that sbMc2r has pharmacological properties similar to those of Mc2rs of later-evolved bony fishes, such as Mrap1 dependence and ACTH selectivity, indicating that these qualities of Mc2r function are ancestral to all bony fish Mc2rs.
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Affiliation(s)
| | - Mary F Jensen
- Department of Biological Sciences, University of Denver, Denver, CO
| | - Robert M Dores
- Department of Biological Sciences, University of Denver, Denver, CO
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Tonoike A, Otaki KI, Terauchi G, Ogawa M, Katayama M, Sakata H, Miyasako F, Mogi K, Kikusui T, Nagasawa M. Identification of genes associated with human-canine communication in canine evolution. Sci Rep 2022; 12:6950. [PMID: 35680934 PMCID: PMC9184530 DOI: 10.1038/s41598-022-11130-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 04/11/2022] [Indexed: 12/02/2022] Open
Abstract
The dog (Canis familiaris) was the first domesticated animal and hundreds of breeds exist today. During domestication, dogs experienced strong selection for temperament, behaviour, and cognitive ability. However, the genetic basis of these abilities is not well-understood. We focused on ancient dog breeds to investigate breed-related differences in social cognitive abilities. In a problem-solving task, ancient breeds showed a lower tendency to look back at humans than other European breeds. In a two-way object choice task, they showed no differences in correct response rate or ability to read human communicative gestures. We examined gene polymorphisms in oxytocin, oxytocin receptor, melanocortin 2 receptor, and a Williams-Beuren syndrome-related gene (WBSCR17), as candidate genes of dog domestication. The single-nucleotide polymorphisms on melanocortin 2 receptor were related to both tasks, while other polymorphisms were associated with the unsolvable task. This indicates that glucocorticoid functions are involved in the cognitive skills acquired during dog domestication.
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Affiliation(s)
- Akiko Tonoike
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Ken-Ichi Otaki
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Go Terauchi
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Misato Ogawa
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Maki Katayama
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Hikari Sakata
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Fumina Miyasako
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Kazutaka Mogi
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
- Center for Human and Animal Symbiosis Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Takefumi Kikusui
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
- Center for Human and Animal Symbiosis Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Miho Nagasawa
- Department of Veterinary Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan.
- Center for Human and Animal Symbiosis Science, Azabu University, 1-17-71, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan.
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Lim JS, Plaska SW, Rege J, Rainey WE, Turcu AF. Aldosterone-Regulating Receptors and Aldosterone-Driver Somatic Mutations. Front Endocrinol (Lausanne) 2021; 12:644382. [PMID: 33796077 PMCID: PMC8008747 DOI: 10.3389/fendo.2021.644382] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 02/08/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Somatic gene mutations that facilitate inappropriate intracellular calcium entrance have been identified in most aldosterone-producing adenomas (APAs). Studies suggest that angiotensin II and adrenocorticotropic hormone (ACTH) augment aldosterone production from APAs. Little is known, however, regarding possible variations in response to hormonal stimuli between APAs with different aldosterone-driver mutations. OBJECTIVE To analyze the transcript expression of type 1 angiotensin II receptors (AGTR1), ACTH receptors (MC2R), and melanocortin 2 receptor accessory protein (MRAP) in APAs with known aldosterone-driver somatic mutations. METHODS RNA was isolated from APAs with mutations in: KCNJ5 (n = 14), ATP1A1 (n = 14), CACNA1D (n = 14), and ATP2B3 (n = 5), and from normal adjacent adrenal tissue (n = 45). Transcript expression of MC2R, MRAP, AGTR1, aldosterone synthase (CYP11B2), 17α-hydroxylase/17,20-lyase (CYP17A1), and 11β-hydroxylase (CYP11B1) were quantified using quantitative RT-PCR and normalized to β-actin. RESULTS Compared to adjacent normal adrenal tissue, APAs had higher transcript levels of CYP11B2 (2,216.4 [1,112.0, 2,813.5]-fold, p < 0.001), MC2R (2.88 [2.00, 4.52]-fold, p < 0.001), and AGTR1 (1.80 [1.02, 2.80]-fold, p < 0.001]), and lower transcript levels of MRAP, CYP17A1, and CYP11B1 (0.28-0.36, p < 0.001 for all). MC2R and CYP11B2 transcripts were lower in APAs with KCNJ5 vs. other mutations (p < 0.01 for both). MC2R expression correlated positively with that of AGTR1 in APAs harboring KCNJ5 and CACNA1D mutations, and with MRAP expression in APAs harboring ATPase mutations. CONCLUSIONS While MC2R and AGTR1 are expressed in all APAs, differences were observed based on the underlying aldosterone-driver somatic mutations. In tandem, our findings suggest that APAs with ATPase-mutations are more responsive to ACTH than KCNJ5-mutated APAs.
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Affiliation(s)
- Jung Soo Lim
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, United States
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, South Korea
| | - Samuel W. Plaska
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, United States
| | - Juilee Rege
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, United States
| | - William E. Rainey
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, United States
- Division of Metabolism, Endocrine, and Diabetes, University of Michigan, Ann Arbor, MI, United States
| | - Adina F. Turcu
- Division of Metabolism, Endocrine, and Diabetes, University of Michigan, Ann Arbor, MI, United States
- *Correspondence: Adina F. Turcu,
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Parween S, Rihs S, Flück CE. Metformin inhibits the activation of melanocortin receptors 2 and 3 in vitro: A possible mechanism for its anti-androgenic and weight balancing effects in vivo? J Steroid Biochem Mol Biol 2020; 200:105684. [PMID: 32360359 DOI: 10.1016/j.jsbmb.2020.105684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 04/10/2020] [Accepted: 04/14/2020] [Indexed: 12/13/2022]
Abstract
Metformin is recommended as one of the first-line drugs for the treatment of type 2 diabetes and the metabolic syndrome. In addition to its insulin sensitizing effects, it has been shown to attenuate androgen excess in women with polycystic ovary syndrome (PCOS) or congenital adrenal hyperplasia (CAH), as well as to ameliorate obesity. The mechanisms of metformin action seem manifold. Preclinical studies suggest that it inhibits the cellular stress response at the level of the mitochondrial OXPHOS system and through AMPK dependent and independent mechanisms. Recent studies have shown that metformin decreases ACTH secretion from pituitary and reduces ACTH-stimulated adrenal secretion. In this study we investigated its specific effect through the melanocortin receptor 2 (MC2R) on signaling targeting adrenal steroidogenesis. To assess this effect, we used mouse adrenal OS3 cells, which do not express the MC2R. Cells were transfected with the MC2R and stimulated by ACTH. Downstream cyclic AMP production was then assessed by a co-transfected cAMP-responsive vector producing luciferase that was measured by a dual luciferase assay. The amount of luciferase produced in this assay corresponds to the amount of receptor activation with varying amount of ACTH. The effect of metformin was then tested in this system. We found a significant inhibition of ACTH induced MC2R activation and signaling with 10 mM metformin. The ACTH concentration response curve (CRC) was half-log shifted and a ∼30 % reduction in maximum receptor response (Rmax) to ACTH in presence of metformin was observed. This effect was dose dependent with an IC50 of 4.2 mM. qRT-PCR analyses showed that metformin decreased ACTH induced MC2R expression. Metformin did not affect cell viability and basal cAMP levels. We also tested the effect of metformin on homologous melanocortin receptors (MCRs). No significant effect was found on MC1R and MC4R activity. However, a log shift of EC50 of ACTH stimulation on MC3R was observed with metformin treatment. Metformin also inhibited melanocortin stimulating hormone (αMSH) induced MC3R activity. In conclusion, we show that metformin acts on MC2R and MC3R signaling directly. The role of MC2R for steroidogenesis is well established. MC3R is involved in energy balance and seems to act as a rheostat when the metabolism is challenged. Our study may explain how metformin helps in weight loss and attenuates the excess response to ACTH in androgen excess disorders such as PCOS and CAH.
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MESH Headings
- Adrenocorticotropic Hormone/pharmacology
- Androgen Antagonists/pharmacology
- Animals
- Cell Line
- Cell Survival/drug effects
- Hypoglycemic Agents/pharmacology
- Metformin/pharmacology
- Mice
- Receptor, Melanocortin, Type 2/antagonists & inhibitors
- Receptor, Melanocortin, Type 2/genetics
- Receptor, Melanocortin, Type 2/metabolism
- Receptor, Melanocortin, Type 3/antagonists & inhibitors
- Receptor, Melanocortin, Type 3/metabolism
- Weight Loss
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Affiliation(s)
- Shaheena Parween
- Pediatric Endocrinology, Diabetology, and Metabolism, Department of Pediatrics, University Children's Hospital Bern, 3010, Bern, Switzerland; Department of Biomedical Research, University of Bern, 3010, Bern, Switzerland
| | - Silvia Rihs
- Pediatric Endocrinology, Diabetology, and Metabolism, Department of Pediatrics, University Children's Hospital Bern, 3010, Bern, Switzerland; Department of Biomedical Research, University of Bern, 3010, Bern, Switzerland
| | - Christa E Flück
- Pediatric Endocrinology, Diabetology, and Metabolism, Department of Pediatrics, University Children's Hospital Bern, 3010, Bern, Switzerland; Department of Biomedical Research, University of Bern, 3010, Bern, Switzerland.
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11
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Hoglin BE, Ferguson A, Pahlavan S, Dores RM. Evidence for diversity in the activation of the melanocortin 2 receptor: A study on gar, elephant shark and stingray MC2Rs. Peptides 2020; 124:170209. [PMID: 31778725 DOI: 10.1016/j.peptides.2019.170209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 10/28/2019] [Accepted: 11/21/2019] [Indexed: 12/21/2022]
Abstract
The melanocortin-2 receptor (MC2R) is a critical component of the HPI and HPA axes of cartilaginous fishes, teleosts and tetrapods. Studies on teleost and tetrapod orthologs suggest two contact sites between ACTH and the receptor involving the following motifs on ACTH: H6F7R8W9 and K15K16R17R18P19. Using spotted gar (g) MC2R as a representative bony fish MC2R ortholog, we found that activation of gMC2R in Chinese Hamster Ovary (CHO) cells was diminished following stimulation of the transfected cells with hACTH(1-24) analogs substituted with alanine at either the H6F7R8W9 or K15K16R17R18P19 motifs compared to stimulation with hACTH(1-24). This observation suggests two ligand contact sites necessary for activation of the gMC2R. The same experiments were done with elephant shark (es) MC2R, however only the H6F7R8W9 analogs blocked activation, pointing to a single contact on esMC2R. Conversely, the red stingray (sr) MC2R activation was blocked by both the H6F7R8W9 and K15K16R17R18P19 alanine-substituted analogs. Together these results build a picture of the evolution of the ligand and receptor interaction between ACTH and MC2R orthologs of different taxa. These results will be discussed in light of the parallel evolution of MC2R orthologs in cartilaginous fishes and bony vertebrates.
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Affiliation(s)
- Brianne E Hoglin
- University of Denver, Department of Biological Sciences, Denver, Colorado, 80210, USA
| | - Amanda Ferguson
- University of Denver, Department of Biological Sciences, Denver, Colorado, 80210, USA
| | - Sheila Pahlavan
- University of Denver, Department of Biological Sciences, Denver, Colorado, 80210, USA
| | - Robert M Dores
- University of Denver, Department of Biological Sciences, Denver, Colorado, 80210, USA.
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12
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Davis PE, Wilkinson EC, Dores RM. Identifying Common Features in the Activation of Melanocortin-2 Receptors: Studies on the Xenopus tropicalis Melanocortin-2 Receptor. Int J Mol Sci 2019; 20:ijms20174166. [PMID: 31454910 PMCID: PMC6747542 DOI: 10.3390/ijms20174166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 08/21/2019] [Accepted: 08/24/2019] [Indexed: 12/03/2022] Open
Abstract
The interaction between the pituitary hormone, adrenocorticotropin (ACTH), and melanocortin-2 receptor (MC2R) orthologs involves the H6 F7 R8 W9 and R/K15 K16 R17 R18 motifs in ACTH making contact with corresponding contact sites on MC2R. Earlier studies have localized the common HFRW binding site of all melanocortin receptors to residues in TM2, TM3, and TM6 that are located close to the extracellular space. The current study has identified residues in Xenopus tropicalis (xt) MC2R in TM4 (I158, F161), in EC2 (M166), and in TM5 (V172) that also are involved in activation of xtMC2R, and may be in the R/KKRR contact site of xtMC2R. These results are compared to earlier studies on the corresponding domains of human MC2R and rainbow trout MC2R in an effort to identify common features in the activation of teleost and tetrapod MC2R orthologs following stimulation with ACTH.
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Affiliation(s)
- Perry E Davis
- Department of Biological Sciences, University of Denver, Denver, CO 80210, USA
| | - Emily C Wilkinson
- Department of Biological Sciences, University of Denver, Denver, CO 80210, USA
| | - Robert M Dores
- Department of Biological Sciences, University of Denver, Denver, CO 80210, USA.
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13
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Yang Y, Chen M, Ventro G, Harmon CM. Amino acid residue L112 in the ACTH receptor plays a key role in ACTH or α-MSH selectivity. Mol Cell Endocrinol 2019; 482:11-17. [PMID: 30553806 DOI: 10.1016/j.mce.2018.12.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 12/03/2018] [Accepted: 12/03/2018] [Indexed: 11/25/2022]
Abstract
The adrenocorticotropic hormone (ACTH) receptor, known as the melanocortin-2 receptor (MC2R), plays a key role in regulating adrenocortical function. MC2R is a subtype of the melanocortin receptor family and ACTH is only agonist for MC2R. Our previous result indicates that ACTH1-17 is the minimal peptide required for MC2R activation but DPhe7-ACTH1-17 has no activity at MC2R. In this study, we examined the molecular basis of the MC2R responsible for ligand selectivity using ACTH analogues and MC2R mutagenesis. Our results indicate that substitution of the 3TM of the MC2R with the corresponding region of the MC3R switches DPhe-ACTH1-17 from no activity to agonist. Further experiment indicates that substitution of the amino acid residue leucine to isoleucine in 112 (L112I) of the 3TM of the MC2R changes both DPhe-ACTH1-17 and ACTH1-15 from no activity to agonists. Surprisingly, mutation L112I switches α-MSH from no activity to agonist, suggesting that this residue plays a key role at MC2R for ligand ACTH or α-MSH selectivity.
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Affiliation(s)
- Yingkui Yang
- Department of Surgery, State University of New York at Buffalo, United States.
| | - Min Chen
- Department of Surgery, State University of New York at Buffalo, United States
| | - George Ventro
- Department of Surgery, State University of New York at Buffalo, United States
| | - Carroll M Harmon
- Department of Surgery, State University of New York at Buffalo, United States
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14
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Abstract
The melanocortin 2 receptor accessory protein (MRAP) was originally discovered to be an essential co-receptor for the ACTH receptor/melanocortin 2 receptor, and it physically interacts with this receptor and is required for receptor trafficking and ligand binding. A related molecule, MRAP2, is mainly expressed in the CNS and appears to have a role with the melanocortin 4 receptor. Consistent with this is the observation that a massively obese phenotype develops when the Mrap2 gene is deleted in mice. However, the characteristics of this phenotype differ from those of Mc4r-deleted mice and suggest that an additional role, possibly resulting from an interaction with other receptors is possible. In support of this, a functional interaction with the prokineticin receptors was recently reported. Evidence for other receptor interactions and aspects of the tissue distribution of MRAP and MRAP2 gene expression may indicate that these accessory proteins have a wider role than with the melanocortin receptors alone.
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Affiliation(s)
- Adrian J L Clark
- Centre for EndocrinologyWilliam Harvey Research Institute, Barts & the London School of Medicine & Dentistry, Queen Mary University of London, Charterhouse Square, London, UK
| | - Li F Chan
- Centre for EndocrinologyWilliam Harvey Research Institute, Barts & the London School of Medicine & Dentistry, Queen Mary University of London, Charterhouse Square, London, UK
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15
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Guo L, Li PH, Li H, Colicino E, Colicino S, Wen Y, Zhang R, Feng X, Barrow TM, Cayir A, Baccarelli AA, Byun HM. Effects of environmental noise exposure on DNA methylation in the brain and metabolic health. Environ Res 2017; 153:73-82. [PMID: 27914298 DOI: 10.1016/j.envres.2016.11.017] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 11/22/2016] [Accepted: 11/23/2016] [Indexed: 05/17/2023]
Abstract
Environmental noise exposure is associated with adverse effects on human health including hearing loss, heart disease, and changes in stress-related hormone levels. Alteration in DNA methylation in response to environmental exposures is a well-known phenomenon and it is implicated in many human diseases. Understanding how environmental noise exposures affect DNA methylation patterns may help to elucidate the link between noise and adverse effects on health. In this pilot study we examined the effects of environmental noise exposure on DNA methylation of genes related to brain function and investigated whether these changes are related with metabolic health. We exposed four groups of male Wistar rats to moderate intensity noise (70-75dB with 20-4000Hz) at night for three days as short-term exposure, and for three weeks as long-term exposure. Noise exposure was limited to 45dB during the daytime. Control groups were exposed to only 45dB, day and night. We measured DNA methylation in the Bdnf, Comt, Crhr1, Mc2r, and Snca genes in tissue from four brain regions of the rats (hippocampus, frontal lobe, medulla oblongata, and inferior colliculus). Further, we measured blood pressure and body weight after long-term noise exposure. We found that environmental noise exposure is associated with gene-specific DNA methylation changes in specific regions of the brain. Changes in DNA methylation are significantly associated with changes in body weight (between Bdnf DNA methylation and Δ body weight: r=0.59, p=0.018; and between LINE-1 ORF DNA methylation and Δ body weight: =-0.80, p=0.0004). We also observed that noise exposure decreased blood pressure (p=0.038 for SBP, p=0.017 for DBP and p 0. 017 for MAP) and decreased body weight (β=-26g, p=0.008). In conclusion, environmental noise exposures can induce changes in DNA methylation in the brain, which may be associated with adverse effects upon metabolic health through modulation of response to stress-related hormones.
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Affiliation(s)
- Liqiong Guo
- Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA.
| | - Peng-Hui Li
- School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China
| | - Hua Li
- Department of Pharmacology, College of Pharmacy, Dalian Medical University, Dalian, Liaoning 116044, China
| | - Elena Colicino
- Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
| | - Silvia Colicino
- Respiratory Epidemiology, Occupational Medicine and Public Health, Imperial College, London, United Kingdom
| | - Yi Wen
- Department of Radiology, No. 531 Hospital of the PLA, Tonghua, Jilin 134000, China
| | - Ruiping Zhang
- Department of Radiology, No. 531 Hospital of the PLA, Tonghua, Jilin 134000, China
| | - Xiaotian Feng
- Department of Bioengineering, School of Mineral Processing and Bioengineering, Central South University, Changsha, Hunan 410083, China
| | - Timothy M Barrow
- Northern Institute for Cancer Research, Newcastle University, Newcastle upon Tyne NE2 4HH, United Kingdom
| | - Akin Cayir
- Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
| | | | - Hyang-Min Byun
- Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
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16
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Ren J, Li Y, Xu N, Li H, Li C, Han R, Wang Y, Li Z, Kang X, Liu X, Tian Y. Association of estradiol on expression of melanocortin receptors and their accessory proteins in the liver of chicken (Gallus gallus). Gen Comp Endocrinol 2017; 240:182-190. [PMID: 27793723 DOI: 10.1016/j.ygcen.2016.10.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 10/18/2016] [Accepted: 10/24/2016] [Indexed: 12/31/2022]
Abstract
The melanocortin receptor accessory proteins (MRAP and MRAP2) are small single-pass transmembrane proteins that regulate the biological functions of the melanocortin receptor (MCR) family. MCRs comprise five receptors (MC1R-MC5R) with diverse physiological roles in mammals. Five MCR members and two MRAPs were also predicted in the chicken (Gallus gallus) genome. However, little is known about their expression, regulation and biological functions. In this study, we cloned the MRAP and MRAP2 genes. Sequencing analysis revealed that the functional domains of MRAP and MRAP2 were conserved among species, suggesting that the physiological roles of chicken MRAP and MRAP2 could be similar to their mammalian counterparts. Tissue expression analysis demonstrated that MRAP was expressed in the adrenal gland, liver, spleen, glandular stomach and lungs, while MRAP2 is predominantly expressed in the adrenal gland. All five MCRs were present in the adrenal gland, but showed different expression patterns in other tissues. The MC5R was the only MCR member that was expressed in the chicken liver. The expression levels of MRAP in chicken liver were significantly increased at sexual maturity stage, and were significantly up-regulated (P<0.05) when chickens and chicken primary hepatocytes were treated with 17β-estradiol in vivo and in vitro, respectively; however, expression levels of PPARγ were down-regulated, and no effect on MC5R was observed. Our results suggested that estrogen could stimulate the expression of MRAP in the liver of chicken through inhibiting the expression of transcription regulation factor PPARγ, and MRAP might play its biological role in a different way rather than forming an MRAP/MC2R complex in chicken liver during the egg-laying period.
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MESH Headings
- Amino Acid Sequence
- Animals
- Carrier Proteins/genetics
- Carrier Proteins/metabolism
- Chickens/genetics
- Cloning, Molecular
- Estradiol/pharmacology
- Gene Expression Profiling
- Gene Expression Regulation, Developmental/drug effects
- Hepatocytes/drug effects
- Hepatocytes/metabolism
- Humans
- Liver/drug effects
- Liver/metabolism
- PPAR gamma/genetics
- PPAR gamma/metabolism
- Phylogeny
- Receptor, Melanocortin, Type 2/chemistry
- Receptor, Melanocortin, Type 2/genetics
- Receptor, Melanocortin, Type 2/metabolism
- Receptors, Melanocortin/chemistry
- Receptors, Melanocortin/genetics
- Receptors, Melanocortin/metabolism
- Sequence Alignment
- Tissue Distribution/drug effects
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Affiliation(s)
- Junxiao Ren
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China
| | - Yanmin Li
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China
| | - Naiyi Xu
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China
| | - Hong Li
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China
| | - Cuicui Li
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China
| | - Ruili Han
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China; Henan Innovative Engineering Research Center of Poultry Germplasm Resource, Henan Agricultural University, Zhengzhou 450002, China; International Joint Research Laboratory for Poultry Breeding of Henan, Henan Agricultural University, Zhengzhou 450002, China
| | - Yanbin Wang
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China; Henan Innovative Engineering Research Center of Poultry Germplasm Resource, Henan Agricultural University, Zhengzhou 450002, China; International Joint Research Laboratory for Poultry Breeding of Henan, Henan Agricultural University, Zhengzhou 450002, China
| | - Zhuanjian Li
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China; Henan Innovative Engineering Research Center of Poultry Germplasm Resource, Henan Agricultural University, Zhengzhou 450002, China; International Joint Research Laboratory for Poultry Breeding of Henan, Henan Agricultural University, Zhengzhou 450002, China
| | - Xiangtao Kang
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China; Henan Innovative Engineering Research Center of Poultry Germplasm Resource, Henan Agricultural University, Zhengzhou 450002, China; International Joint Research Laboratory for Poultry Breeding of Henan, Henan Agricultural University, Zhengzhou 450002, China
| | - Xiaojun Liu
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China; Henan Innovative Engineering Research Center of Poultry Germplasm Resource, Henan Agricultural University, Zhengzhou 450002, China; International Joint Research Laboratory for Poultry Breeding of Henan, Henan Agricultural University, Zhengzhou 450002, China.
| | - Yadong Tian
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China; Henan Innovative Engineering Research Center of Poultry Germplasm Resource, Henan Agricultural University, Zhengzhou 450002, China; International Joint Research Laboratory for Poultry Breeding of Henan, Henan Agricultural University, Zhengzhou 450002, China.
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17
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Babischkin JS, Aberdeen GW, Pepe GJ, Albrecht ED. Estrogen Suppresses Interaction of Melanocortin 2 Receptor and Its Accessory Protein in the Primate Fetal Adrenal Cortex. Endocrinology 2016; 157:4588-4601. [PMID: 27779913 PMCID: PMC5133357 DOI: 10.1210/en.2016-1562] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We have shown that fetal adrenal fetal zone (FZ) volume and serum dehydroepiandrosterone sulfate (DHAS) levels were increased, whereas definitive and transitional zone (DZ/TZ) volume was unaltered, in baboons in which estrogen levels were suppressed by the administration of the aromatase inhibitor letrozole. The interaction of the melanocortin 2 receptor (MC2R) with its accessory protein (MRAP) is essential for trafficking MC2R to the adrenal cell surface for binding to ACTH. The present study determined whether the estrogen-dependent regulation of fetal adrenocortical development is mediated by ACTH and/or expression/interaction of MC2R and MRAP. Fetal pituitary proopiomelanocortin mRNA and plasma ACTH levels and fetal adrenal MC2R-MRAP interaction were assessed in baboons in which estrogen was suppressed/restored by letrozole/letrozole plus estradiol administration during the second half of gestation. Although fetal pituitary proopiomelanocortin and plasma ACTH levels and fetal adrenal MC2R and MRAP protein levels were unaltered, MC2R-MRAP interaction was 2-fold greater (P < .05) in the DZ/TZ in letrozole-treated baboons than in untreated animals and restored by letrozole plus estradiol treatment. We propose that the increasing levels of estradiol with advancing pregnancy suppress interaction of MC2R with MRAP, thereby diminishing MC2R movement to the cell membrane in the DZ/TZ. This would be expected to reduce progenitor cell proliferation in the DZ and migration to the FZ, thereby restraining FZ growth and DHAS production to maintain fetal adrenal DHAS and placental estradiol levels in a physiological range late in gestation.
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Affiliation(s)
- Jeffery S Babischkin
- Department of Obstetrics, Gynecology, and Reproductive Sciences (J.S.B., G.W.A., E.D.A.), Center for Studies in Reproduction, University of Maryland School of Medicine, Baltimore, Maryland 21201; and Department of Physiological Sciences (G.J.P.), Eastern Virginia Medical School, Norfolk, Virginia 23501
| | - Graham W Aberdeen
- Department of Obstetrics, Gynecology, and Reproductive Sciences (J.S.B., G.W.A., E.D.A.), Center for Studies in Reproduction, University of Maryland School of Medicine, Baltimore, Maryland 21201; and Department of Physiological Sciences (G.J.P.), Eastern Virginia Medical School, Norfolk, Virginia 23501
| | - Gerald J Pepe
- Department of Obstetrics, Gynecology, and Reproductive Sciences (J.S.B., G.W.A., E.D.A.), Center for Studies in Reproduction, University of Maryland School of Medicine, Baltimore, Maryland 21201; and Department of Physiological Sciences (G.J.P.), Eastern Virginia Medical School, Norfolk, Virginia 23501
| | - Eugene D Albrecht
- Department of Obstetrics, Gynecology, and Reproductive Sciences (J.S.B., G.W.A., E.D.A.), Center for Studies in Reproduction, University of Maryland School of Medicine, Baltimore, Maryland 21201; and Department of Physiological Sciences (G.J.P.), Eastern Virginia Medical School, Norfolk, Virginia 23501
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18
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Permuth JB, Pirie A, Ann Chen Y, Lin HY, Reid BM, Chen Z, Monteiro A, Dennis J, Mendoza-Fandino G, Anton-Culver H, Bandera EV, Bisogna M, Brinton L, Brooks-Wilson A, Carney ME, Chenevix-Trench G, Cook LS, Cramer DW, Cunningham JM, Cybulski C, D'Aloisio AA, Anne Doherty J, Earp M, Edwards RP, Fridley BL, Gayther SA, Gentry-Maharaj A, Goodman MT, Gronwald J, Hogdall E, Iversen ES, Jakubowska A, Jensen A, Karlan BY, Kelemen LE, Kjaer SK, Kraft P, Le ND, Levine DA, Lissowska J, Lubinski J, Matsuo K, Menon U, Modugno R, Moysich KB, Nakanishi T, Ness RB, Olson S, Orlow I, Pearce CL, Pejovic T, Poole EM, Ramus SJ, Anne Rossing M, Sandler DP, Shu XO, Song H, Taylor JA, Teo SH, Terry KL, Thompson PJ, Tworoger SS, Webb PM, Wentzensen N, Wilkens LR, Winham S, Woo YL, Wu AH, Yang H, Zheng W, Ziogas A, Phelan CM, Schildkraut JM, Berchuck A, Goode EL, Pharoah PDP, Sellers TA. Exome genotyping arrays to identify rare and low frequency variants associated with epithelial ovarian cancer risk. Hum Mol Genet 2016; 25:3600-3612. [PMID: 27378695 PMCID: PMC5179948 DOI: 10.1093/hmg/ddw196] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 06/17/2016] [Accepted: 06/20/2016] [Indexed: 12/17/2022] Open
Abstract
Rare and low frequency variants are not well covered in most germline genotyping arrays and are understudied in relation to epithelial ovarian cancer (EOC) risk. To address this gap, we used genotyping arrays targeting rarer protein-coding variation in 8,165 EOC cases and 11,619 controls from the international Ovarian Cancer Association Consortium (OCAC). Pooled association analyses were conducted at the variant and gene level for 98,543 variants directly genotyped through two exome genotyping projects. Only common variants that represent or are in strong linkage disequilibrium (LD) with previously-identified signals at established loci reached traditional thresholds for exome-wide significance (P < 5.0 × 10 - 7). One of the most significant signals (Pall histologies = 1.01 × 10 - 13;Pserous = 3.54 × 10 - 14) occurred at 3q25.31 for rs62273959, a missense variant mapping to the LEKR1 gene that is in LD (r2 = 0.90) with a previously identified 'best hit' (rs7651446) mapping to an intron of TIPARP. Suggestive associations (5.0 × 10 - 5 > P≥5.0 ×10 - 7) were detected for rare and low-frequency variants at 16 novel loci. Four rare missense variants were identified (ACTBL2 rs73757391 (5q11.2), BTD rs200337373 (3p25.1), KRT13 rs150321809 (17q21.2) and MC2R rs104894658 (18p11.21)), but only MC2R rs104894668 had a large effect size (OR = 9.66). Genes most strongly associated with EOC risk included ACTBL2 (PAML = 3.23 × 10 - 5; PSKAT-o = 9.23 × 10 - 4) and KRT13 (PAML = 1.67 × 10 - 4; PSKAT-o = 1.07 × 10 - 5), reaffirming variant-level analysis. In summary, this large study identified several rare and low-frequency variants and genes that may contribute to EOC susceptibility, albeit with possible small effects. Future studies that integrate epidemiology, sequencing, and functional assays are needed to further unravel the unexplained heritability and biology of this disease.
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Affiliation(s)
- Jennifer B Permuth
- Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Ailith Pirie
- Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK
| | - Y Ann Chen
- Department of Biostatistics and Bioinformatics, Moffitt Cancer Center, Tampa, FL, USA
| | - Hui-Yi Lin
- Department of Biostatistics and Bioinformatics, Moffitt Cancer Center, Tampa, FL, USA
| | - Brett M Reid
- Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Zhihua Chen
- Department of Biostatistics and Bioinformatics, Moffitt Cancer Center, Tampa, FL, USA
| | - Alvaro Monteiro
- Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Joe Dennis
- Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK
| | | | - Hoda Anton-Culver
- Department of Epidemiology, Director of Genetic Epidemiology Research Institute, UCI School of Medicine, University of California Irvine, Irvine, CA, USA
| | - Elisa V Bandera
- Cancer Prevention and Control Program, Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, USA
| | - Maria Bisogna
- Gynecology Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Louise Brinton
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
| | - Angela Brooks-Wilson
- Canada's Michael Smith Genome Sciences Centre, BC Cancer Agency, Vancouver BC, Canada
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada
| | - Michael E Carney
- Department of Obstetrics and Gynecology, John A Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Georgia Chenevix-Trench
- Genetics and Computational Biology Department, QIMR Berghofer Medical Research Institute, Queensland, Australia
| | - Linda S Cook
- Division of Epidemiology and Biostatistics, Department of Internal Medicine, University of New Mexico, Albuquerque, New Mexico, USA
| | - Daniel W Cramer
- Obstetrics and Gynecology Epidemiology Center, Brigham and Women's Hospital, Boston, Massachusetts, USA
| | - Julie M Cunningham
- Department of Laboratory of Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Cezary Cybulski
- International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland
| | | | - Jennifer Anne Doherty
- Department of Epidemiology, Geisel School of Medicine, Dartmouth College, Hanover, NY, USA
| | - Madalene Earp
- Department of Health Science Research, Division of Epidemiology, Mayo Clinic, Rochester, MN, USA
| | - Robert P Edwards
- Division of Gynecologic Oncology, Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- Ovarian Cancer Center of Excellence, Womens Cancer Research Program, Magee- Womens Research Institute & University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA
| | - Brooke L Fridley
- Department of Biostatistics, University of Kansas Medical Center, Kansas City, KS, USA
| | - Simon A Gayther
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, USA
| | | | - Marc T Goodman
- Cancer Prevention and Control, Samuel Oshin Comprehensive Cancer Institute, Cedars- Sinai Medical Center, Los Angeles, CA, USA
- Community and Population Health Research Institute, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Jacek Gronwald
- International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland
| | - Estrid Hogdall
- Department of Virus, Lifestyle and Genes, Danish Cancer Society Research Center, Copenhagen, Denmark and Molecular Unit, Department of Pathology, Herlev Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Edwin S Iversen
- Department of Statistical Science, Duke University, Durham, NC, USA
| | - Anna Jakubowska
- International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland
| | - Allan Jensen
- Department of Virus, Lifestyle and Genes, Danish Cancer Society Research Center, Copenhagen, Denmark
| | - Beth Y Karlan
- Women's Cancer Program at the Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California
| | - Linda E Kelemen
- Department of Public Health Sciences, Medical University of South Carolina College of Medicine, Charleston, SC, USA
| | - Suzanne K Kjaer
- Department of Virus, Lifestyle and Genes, Danish Cancer Society Research Center, Copenhagen, Denmark
- Department of Gynaecology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Peter Kraft
- Program in Genetic Epidemiology and Statistical Genetics, Harvard TH Chan School of Public Health, Boston, MA, USA
| | - Nhu D Le
- Cancer Control Research, BC Cancer Agency, Vancouver, BC, Canada
| | - Douglas A Levine
- Gynecology Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Jolanta Lissowska
- Department of Cancer Epidemiology and Prevention, The Maria Sklodowska-Curie Memorial Cancer Center, Warsaw, Poland
| | - Jan Lubinski
- International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland
| | - Keitaro Matsuo
- Division of Molecular Medicine, Aichi Cancer Center Research Institute, Nagoya, Aichi, Japan
| | - Usha Menon
- Women's Cancer, Institute for Women's Health, University College London, London, UK
| | - Rosemary Modugno
- Division of Gynecologic Oncology, Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- Ovarian Cancer Center of Excellence, Womens Cancer Research Program, Magee- Womens Research Institute & University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA
- Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA, USA
| | - Kirsten B Moysich
- Department of Cancer Prevention and Control, Roswell Park Cancer Institute, Buffalo, NY, USA
| | - Toru Nakanishi
- Department of Gynecologic Oncology, Aichi Cancer Center Central Hospital, Nagoya, Aichi, Japan
| | - Roberta B Ness
- The University of Texas School of Public Health, Houston, TX, USA
| | - Sara Olson
- Memorial Sloan Kettering Cancer Center, Department of Epidemiology and Biostatistics, New York,NY, USA
| | - Irene Orlow
- Memorial Sloan Kettering Cancer Center, Department of Epidemiology and Biostatistics, New York,NY, USA
| | - Celeste L Pearce
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, USA
- Department of Epidemology,University of Michigan School of Public Health, Ann Arbor, MI, USA
| | - Tanja Pejovic
- Department of Obstetrics and Gynecology, Oregon Health and Science University, Portland, OR, USA
- Knight Cancer Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Elizabeth M Poole
- Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Susan J Ramus
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, USA
| | - Mary Anne Rossing
- Program in Epidemiology, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
- Department of Epidemiology, University of Washington, Seattle, WA, USA
| | - Dale P Sandler
- Epidemiology Branch, Division of Intramural Research, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC, USA
| | - Xiao-Ou Shu
- Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Honglin Song
- Department of Oncology, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK
| | - Jack A Taylor
- Epidemiology Branch, Division of Intramural Research, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC, USA
| | - Soo-Hwang Teo
- Cancer Research Malaysia, Subang Jaya, Malaysia
- University Malaya Medical Centre, University Malaya, Kuala Lumpur, Malaysia
| | - Kathryn L Terry
- Obstetrics and Gynecology Epidemiology Center, Brigham and Women's Hospital, Boston, Massachusetts, USA
| | - Pamela J Thompson
- Women's Cancer Program at the Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California
| | - Shelley S Tworoger
- Channing Division of Network Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Penelope M Webb
- Population Health Department, QIMR Berghofer Medical Research Institute, Herston, QLD, Australia
| | - Nicolas Wentzensen
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda MD, USA
| | - Lynne R Wilkens
- Cancer Epidemiology Program, University of Hawaii Cancer Center, Hawaii, USA
| | - Stacey Winham
- Department of Health Science Research, Division of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, Minnesota, USA
| | - Yin-Ling Woo
- Department of Obstetrics and Gynaecology, University Malaya Medical Centre, University Malaya, Kuala Lumpur, Malaysia
| | - Anna H Wu
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California Norris Comprehensive Cancer Center, Los Angeles, California, USA
| | - Hannah Yang
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda MD, USA
| | - Wei Zheng
- Vanderbilt Epidemiology Center and Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Argyrios Ziogas
- Department of Epidemiology, University of California Irvine, Irvine, CA, USA
| | - Catherine M Phelan
- Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Joellen M Schildkraut
- Department of Community and Family Medicine, Duke University Medical Center, Durham, NC, USA
- Cancer Control and Population Sciences, Duke Cancer Institute, Durham, NC, USA
| | - Andrew Berchuck
- Department of Obstetrics and Gynecology, Duke University Medical Center, Durham, North Carolina, USA, Exome genotyping arrays to identify rare and low frequency variants associated with epithelial ovarian cancer risk
| | - Ellen L Goode
- Department of Health Science Research, Division of Epidemiology, Mayo Clinic, Rochester, MN, USA
| | - Paul D P Pharoah
- Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK
- Department of Oncology, University of Cambridge, Strangeways Research Laboratory, Cambridge, UK
| | - Thomas A Sellers
- Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, FL, USA
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19
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Abstract
The pituitary adrenocorticotropic hormone (ACTH) plays a pivotal role in homeostasis and stress response and is thus the major component of the hypothalamo-pituitary-adrenal axis. After a brief summary of ACTH production from proopiomelanocortin (POMC) and on ACTH receptor properties, the first part of the review covers the role of ACTH in steroidogenesis and steroid secretion. We highlight the mechanisms explaining the differential acute vs chronic effects of ACTH on aldosterone and glucocorticoid secretion. The second part summarizes the effects of ACTH on adrenal growth, addressing its role as either a mitogenic or a differentiating factor. We then review the mechanisms involved in steroid secretion, from the classical Cyclic adenosine monophosphate second messenger system to various signaling cascades. We also consider how the interaction between the extracellular matrix and the cytoskeleton may trigger activation of signaling platforms potentially stimulating or repressing the steroidogenic potency of ACTH. Finally, we consider the extra-adrenal actions of ACTH, in particular its role in differentiation in a variety of cell types, in addition to its known lipolytic effects on adipocytes. In each section, we endeavor to correlate basic mechanisms of ACTH function with the pathological consequences of ACTH signaling deficiency and of overproduction of ACTH.
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Affiliation(s)
- Nicole Gallo-Payet
- Division of EndocrinologyDepartment of Medicine, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Quebec, Canada Division of EndocrinologyDepartment of Medicine, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Quebec, Canada
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20
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Kitamoto T, Suematsu S, Yamazaki Y, Nakamura Y, Sasano H, Matsuzawa Y, Saito J, Omura M, Nishikawa T. Clinical and Steroidogenic Characteristics of Aldosterone-Producing Adenomas With ATPase or CACNA1D Gene Mutations. J Clin Endocrinol Metab 2016; 101:494-503. [PMID: 26606680 DOI: 10.1210/jc.2015-3284] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECT This comparative study clarified the clinical characteristics and in vitro steroidogenic activities of aldosterone-producing adenomas (APAs) harboring ATPase or CACNA1D gene mutations. DESIGN AND PATIENTS Genetic testing was performed on 159 unilateral APAs. Somatic ATPase and CACNA1D gene mutations were analyzed in 42 APA tissues without KCNJ5 gene mutations. RESULTS ATP1A1, ATP2B3, and CACNA1D mutations were detected in one, four, and four patients, respectively. Compared with patients without KCNJ5, ATPase, or CACNA1D mutations (wild type), ATPase mutations tended to have more severe hyperaldosteronism and smaller tumors; those with CACNA1D mutations had clinical characteristics and tumor sizes similar to those with wild-type genes. APAs with ATPase mutations were composed mainly of compact eosinophilic tumor cells, whereas CACNA1D mutations resulted in predominantly clear tumor cells. Aldosterone production in APA cells with ATP2B3 mutations were more responsive to dibutyryl cAMP, whereas those with CACNA1D mutations were more responsive to adrenocorticotropic hormone than the wild-type cells. CONCLUSION APAs with ATPase mutations demonstrated a potentially severe primary aldosteronism phenotype, whereas those with CACNA1D mutations displayed characteristics similar to wild-type APAs. The status of stimulated aldosterone production was also different according to the cell types, suggesting that the regulatory effects of adrenocorticotropic hormone on aldosterone synthesis could possibly vary according to the intracellular signaling involved in hormone production.
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Affiliation(s)
- Takumi Kitamoto
- Endocrinology and Diabetes Center (T.K., S.S., Y.M., J.S., M.O., T.N.), Yokohama Rosai Hospital, Yokohama 222-0036, Japan; and Department of Pathology (Y.Y., Y.N., H.S.), Tohoku University School of Medicine, Sendai 980-8575, Japan
| | - Sachiko Suematsu
- Endocrinology and Diabetes Center (T.K., S.S., Y.M., J.S., M.O., T.N.), Yokohama Rosai Hospital, Yokohama 222-0036, Japan; and Department of Pathology (Y.Y., Y.N., H.S.), Tohoku University School of Medicine, Sendai 980-8575, Japan
| | - Yuto Yamazaki
- Endocrinology and Diabetes Center (T.K., S.S., Y.M., J.S., M.O., T.N.), Yokohama Rosai Hospital, Yokohama 222-0036, Japan; and Department of Pathology (Y.Y., Y.N., H.S.), Tohoku University School of Medicine, Sendai 980-8575, Japan
| | - Yasuhiro Nakamura
- Endocrinology and Diabetes Center (T.K., S.S., Y.M., J.S., M.O., T.N.), Yokohama Rosai Hospital, Yokohama 222-0036, Japan; and Department of Pathology (Y.Y., Y.N., H.S.), Tohoku University School of Medicine, Sendai 980-8575, Japan
| | - Hironobu Sasano
- Endocrinology and Diabetes Center (T.K., S.S., Y.M., J.S., M.O., T.N.), Yokohama Rosai Hospital, Yokohama 222-0036, Japan; and Department of Pathology (Y.Y., Y.N., H.S.), Tohoku University School of Medicine, Sendai 980-8575, Japan
| | - Yoko Matsuzawa
- Endocrinology and Diabetes Center (T.K., S.S., Y.M., J.S., M.O., T.N.), Yokohama Rosai Hospital, Yokohama 222-0036, Japan; and Department of Pathology (Y.Y., Y.N., H.S.), Tohoku University School of Medicine, Sendai 980-8575, Japan
| | - Jun Saito
- Endocrinology and Diabetes Center (T.K., S.S., Y.M., J.S., M.O., T.N.), Yokohama Rosai Hospital, Yokohama 222-0036, Japan; and Department of Pathology (Y.Y., Y.N., H.S.), Tohoku University School of Medicine, Sendai 980-8575, Japan
| | - Masao Omura
- Endocrinology and Diabetes Center (T.K., S.S., Y.M., J.S., M.O., T.N.), Yokohama Rosai Hospital, Yokohama 222-0036, Japan; and Department of Pathology (Y.Y., Y.N., H.S.), Tohoku University School of Medicine, Sendai 980-8575, Japan
| | - Tetsuo Nishikawa
- Endocrinology and Diabetes Center (T.K., S.S., Y.M., J.S., M.O., T.N.), Yokohama Rosai Hospital, Yokohama 222-0036, Japan; and Department of Pathology (Y.Y., Y.N., H.S.), Tohoku University School of Medicine, Sendai 980-8575, Japan
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21
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Tsai SL, Green J, Metherell LA, Curtis F, Fernandez B, Healey A, Curtis J. Primary Adrenocortical Insufficiency Case Series: Genetic Etiologies More Common than Expected. Horm Res Paediatr 2015; 85:35-42. [PMID: 26650942 DOI: 10.1159/000441843] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 10/19/2015] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Primary adrenal insufficiency (AI) is an important cause of morbidity in children. Our objectives were: (1) to describe the clinical presentation of children with new-onset primary AI, and (2) to identify monogenic causes of primary AI in children. METHODS Chart review and mutation detection in candidate genes were conducted for 11 patients with primary AI. RESULTS The likely cause of AI was determined in 9 patients. One had a homozygous MC2R mutation associated with familial glucocorticoid deficiency. Two had the same homozygous mutation in the AIRE gene which is associated with type 1 autoimmune polyglandular syndrome. One patient had a heterozygous change in this gene of undetermined significance. Five were homozygous for the previously reported p.R188C STAR mutation causing nonclassic lipoid congenital adrenal hyperplasia, representing the largest cohort of such patients from a single geographic area. In the remaining 2 patients, no clear etiology was identified. CONCLUSIONS We recommend genetic testing for patients who have negative anti-adrenal antibodies or suggestive family history. Diagnosing a genetic etiology can provide information about prognosis and treatment, and is therefore beneficial for patients. Our high proportion of patients with nonclassic lipoid congenital adrenal hyperplasia likely represents a founder effect.
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Affiliation(s)
- Sarah L Tsai
- Discipline of Pediatrics (Division of Endocrinology), Memorial University of Newfoundland, St. John's, Nfld., Canada
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22
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Fierro-Castro C, Santa-Cruz MC, Hernández-Sánchez M, Teles M, Tort L. Analysis of steroidogenic pathway key transcripts in interrenal cells isolated by laser microdissection (LMD) in stressed rainbow trout. Comp Biochem Physiol A Mol Integr Physiol 2015; 190:39-46. [PMID: 26358831 DOI: 10.1016/j.cbpa.2015.09.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 06/18/2015] [Accepted: 09/02/2015] [Indexed: 12/17/2022]
Abstract
An assessment of the key transcripts expression of the steroidogenesis-related genes in rainbow trout subjected to either acute or chronic stress was performed in both interrenal cells and whole head kidney tissue. The analysis of interrenal cells was possible thanks to the use, for the first time in this specific type of cells, of the technique of laser microdissection (LMD) which allows to isolate specific cells and process them independently of other surrounding cells in the tissue. The results indicated that both acute and chronic stressors induced a significant up-regulation of the steroidogenesis-related genes with a higher but expected degree in the isolated cells. In addition, under acute stress a delay between cortisol levels and transcript expression was found. Under chronic stress a clear relation between plasma cortisol levels, mRNA transcription and interrenal tissue area was observed, since all parameters were concomitantly increased at day 5 after stress. Moreover results indicated that the LMD technique allowed ascertaining with more precision and accuracy whether and when the steroidogenesis-related genes were significantly expressed, disregarding the noise produced by other cells present in the head kidney. Results also showed a typical physiological response in plasma parameters and a positive relationship between plasma cortisol data and transcript abundance in isolated cells. The present results may help to better understand the mechanisms behind the interrenal response to stress challenges in fish.
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Affiliation(s)
- Camino Fierro-Castro
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain.
| | - María Carmen Santa-Cruz
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - Marta Hernández-Sánchez
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - Mariana Teles
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
| | - Lluís Tort
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain
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23
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Dores RM, Garcia Y. Views on the co-evolution of the melanocortin-2 receptor, MRAPs, and the hypothalamus/pituitary/adrenal-interrenal axis. Mol Cell Endocrinol 2015; 408:12-22. [PMID: 25573240 DOI: 10.1016/j.mce.2014.12.022] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 12/26/2014] [Accepted: 12/27/2014] [Indexed: 12/30/2022]
Abstract
A critical regulatory component of the hypothalamus/pituitary/adrenal axis (HPA) in mammals, reptiles and birds, and in the hypothalamus/pituitary/interrenal (HPI) axis of amphibians and teleosts (modern bony fishes) is the strict ligand selectivity of the melanocortin-2 receptor (MC2R). Tetrapod and teleost MC2R orthologs can only be activated by the anterior pituitary hormone, ACTH, but not by any of the MSH-sized ligands coded in POMC. In addition, both tetrapod and teleost MC2R orthologs require co-expression with the accessory protein, MRAP. However, the MC2R ortholog of the elephant shark, a cartilaginous fish, can be activated by either ACTH or the MSH-sized ligands, and the elephant shark MC2R ortholog does not require co-expression with an MRAP for activation. Given these observations, this review will provide a scenario for the co-evolution of MC2R and MRAP, based on the assumption that the obligate interaction between MC2R and MRAP evolved during the early radiation of the ancestral bony fishes.
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Affiliation(s)
- Robert M Dores
- Department of Biological Sciences, University of Denver, Denver, CO 80210, USA.
| | - Yesenia Garcia
- Department of Biological Sciences, University of Denver, Denver, CO 80210, USA
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24
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Simamura E, Arikawa T, Ikeda T, Shimada H, Shoji H, Masuta H, Nakajima Y, Otani H, Yonekura H, Hatta T. Melanocortins contribute to sequential differentiation and enucleation of human erythroblasts via melanocortin receptors 1, 2 and 5. PLoS One 2015; 10:e0123232. [PMID: 25860801 PMCID: PMC4393082 DOI: 10.1371/journal.pone.0123232] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 02/17/2015] [Indexed: 11/30/2022] Open
Abstract
In this study, we showed that adrenocorticotropic hormone (ACTH) promoted erythroblast differentiation and increased the enucleation ratio of erythroblasts. Because ACTH was contained in hematopoietic medium as contamination, the ratio decreased by the addition of anti-ACTH antibody (Ab). Addition of neutralizing Abs (nAbs) for melanocortin receptors (MCRs) caused erythroblast accumulation at specific stages, i.e., the addition of anti-MC2R nAb led to erythroblast accumulation at the basophilic stage (baso-E), the addition of anti-MC1R nAb caused accumulation at the polychromatic stage (poly-E), and the addition of anti-MC5R nAb caused accumulation at the orthochromatic stage (ortho-E). During erythroblast differentiation, ERK, STAT5, and AKT were consecutively phosphorylated by erythropoietin (EPO). ERK, STAT5, and AKT phosphorylation was inhibited by blocking MC2R, MC1R, and MC5R, respectively. Finally, the phosphorylation of myosin light chain 2, which is essential for the formation of contractile actomyosin rings, was inhibited by anti-MC5R nAb. Taken together, our study suggests that MC2R and MC1R signals are consecutively required for the regulation of EPO signal transduction in erythroblast differentiation, and that MC5R signal transduction is required to induce enucleation. Thus, melanocortin induces proliferation and differentiation at baso-E, and polarization and formation of an actomyosin contractile ring at ortho-E are required for enucleation.
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MESH Headings
- Adrenocorticotropic Hormone/antagonists & inhibitors
- Adrenocorticotropic Hormone/metabolism
- Antibodies, Neutralizing
- Cell Differentiation/physiology
- Cells, Cultured
- Erythroblasts/cytology
- Erythroblasts/metabolism
- Erythropoiesis/physiology
- Extracellular Signal-Regulated MAP Kinases/metabolism
- Humans
- Melanocortins/metabolism
- Models, Biological
- Proto-Oncogene Proteins c-akt/metabolism
- Receptor, Melanocortin, Type 1/antagonists & inhibitors
- Receptor, Melanocortin, Type 1/genetics
- Receptor, Melanocortin, Type 1/metabolism
- Receptor, Melanocortin, Type 2/antagonists & inhibitors
- Receptor, Melanocortin, Type 2/genetics
- Receptor, Melanocortin, Type 2/metabolism
- Receptors, Melanocortin/antagonists & inhibitors
- Receptors, Melanocortin/genetics
- Receptors, Melanocortin/metabolism
- STAT5 Transcription Factor/metabolism
- Signal Transduction
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Affiliation(s)
- Eriko Simamura
- Department of Anatomy, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa 920–0293, Japan
| | - Tomohiro Arikawa
- Department of Biology, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa 920–0293, Japan
| | - Takayuki Ikeda
- Department of Biochemistry, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa 920–0293, Japan
| | - Hiroki Shimada
- Department of Anatomy, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa 920–0293, Japan
| | - Hiroki Shoji
- Department of Biology, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa 920–0293, Japan
| | - Hiroko Masuta
- Department of Anatomy, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa 920–0293, Japan
| | - Yuriko Nakajima
- Department of Anatomy, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa 920–0293, Japan
| | - Hiroki Otani
- Department of Developmental Biology, Faculty of Medicine, Shimane University, Izumo 693–8601, Japan
| | - Hideto Yonekura
- Department of Biochemistry, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa 920–0293, Japan
| | - Toshihisa Hatta
- Department of Anatomy, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa 920–0293, Japan
- * E-mail:
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25
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Lottrup G, Nielsen JE, Skakkebæk NE, Juul A, Rajpert-De Meyts E. Abundance of DLK1, differential expression of CYP11B1, CYP21A2 and MC2R, and lack of INSL3 distinguish testicular adrenal rest tumours from Leydig cell tumours. Eur J Endocrinol 2015; 172:491-9. [PMID: 25609776 DOI: 10.1530/eje-14-0810] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Testicular adrenal rest tumours (TARTs) are a common finding in patients with congenital adrenal hyperplasia (CAH). These tumours constitute a diagnostic and management conundrum and may lead to infertility. TART cells share many functional and morphological similarities with Leydig cells (LCs), and masses consisting of such cells are occasionally misclassified as malignant testicular tumours, which may lead to erroneous orchiectomy in these patients. DESIGN In this study, we aimed to investigate the potential of LC developmental markers and adrenal steroidogenic markers in the differential diagnosis of TARTs and malignant LC tumours (LCTs). METHODS We investigated mRNA and protein expression of testicular steroidogenic enzymes; CYP11A1 and HSD3B1/2, markers of adrenal steroidogenesis; CYP11B1, CYP21A2 and ACTH receptor/melanocortin 2 receptor (MC2R), and markers of LC maturation; and delta-like 1 homolog (DLK1) and insulin-like 3 (INSL3) in testicular biopsies with TART, orchiectomy specimens with LCTs and samples from human fetal adrenals. RESULTS Expression of testicular steroidogenic enzymes was observed in all specimens. All investigated adrenal steroidogenic markers were expressed in TART, and weak reactions for CYP11B1 and MC2R were observed at the protein level in LTCs. TART and fetal adrenals had identical expression profiles. DLK1 was highly expressed and INSL3 not detectable in TART, whereas INSL3 was highly expressed in LCTs. CONCLUSIONS The similar expression profiles in TART and fetal adrenals as well as the presence of classical markers of adrenal steroidogenesis lend support to the hypothesis that TART develops from a displaced adrenal cell type. Malignant LCTs seem to have lost DLK1 expression and do not resemble immature LCs. The different expression pattern of DLK1, INSL3 and most adrenocortical markers adds to the elucidation of the histogenesis of testicular interstitial tumours and may facilitate histopathological diagnosis.
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Affiliation(s)
- Grete Lottrup
- Department of Growth and Reproductionand International Center for Research and Research Training in Endocrine Disrupting Effects on Male Reproduction & Child Health (EDMaRC), Copenhagen University Hospital, Section 5064, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen Ø, Denmark
| | - John E Nielsen
- Department of Growth and Reproductionand International Center for Research and Research Training in Endocrine Disrupting Effects on Male Reproduction & Child Health (EDMaRC), Copenhagen University Hospital, Section 5064, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen Ø, Denmark
| | - Niels E Skakkebæk
- Department of Growth and Reproductionand International Center for Research and Research Training in Endocrine Disrupting Effects on Male Reproduction & Child Health (EDMaRC), Copenhagen University Hospital, Section 5064, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen Ø, Denmark
| | - Anders Juul
- Department of Growth and Reproductionand International Center for Research and Research Training in Endocrine Disrupting Effects on Male Reproduction & Child Health (EDMaRC), Copenhagen University Hospital, Section 5064, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen Ø, Denmark
| | - Ewa Rajpert-De Meyts
- Department of Growth and Reproductionand International Center for Research and Research Training in Endocrine Disrupting Effects on Male Reproduction & Child Health (EDMaRC), Copenhagen University Hospital, Section 5064, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen Ø, Denmark
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26
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Abstract
ACTH-independent macronodular adrenal hyperplasia is a rare cause of Cushing's syndrome (CS), accounting for <2% of all endogenous CS cases; however it is more frequently identified incidentally with sub-clinical cortisol secretion. Recently, cortisol secretion has been shown to be regulated by ectopic corticotropin, which is in turn produced by clusters of steroidogenic cells of the hyperplastic adrenal nodules. Hence, the term 'ACTH-independent' is not entirely appropriate for this disorder. Accordingly, the disease is designated primary macronodular adrenal hyperplasia (PMAH) in this review article. The means by which cortisol production is regulated in PMAH despite the suppressed levels of ACTH of pituitary origin is exceedingly complex. Several molecular events have been proposed to explain the enhanced cortisol secretion, increased cell proliferation, and nodule formation in PMAH. Nonetheless, the precise sequence of events and the molecular mechanisms underlying this condition remain unclear. The purpose of this review is therefore to present new insights on the molecular and genetic profile of PMAH pathophysiology, and to discuss the implications for disease progression.
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Affiliation(s)
- Maria Candida Barisson Villares Fragoso
- Unidade de SuprarrenalDisciplina de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, BrazilInstituto do Câncer de São Paulo ICESPSão Paulo, BrazilDépartement de MédecineCentre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada Unidade de SuprarrenalDisciplina de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, BrazilInstituto do Câncer de São Paulo ICESPSão Paulo, BrazilDépartement de MédecineCentre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
| | - Guilherme Asmar Alencar
- Unidade de SuprarrenalDisciplina de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, BrazilInstituto do Câncer de São Paulo ICESPSão Paulo, BrazilDépartement de MédecineCentre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
| | - Antonio Marcondes Lerario
- Unidade de SuprarrenalDisciplina de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, BrazilInstituto do Câncer de São Paulo ICESPSão Paulo, BrazilDépartement de MédecineCentre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
| | - Isabelle Bourdeau
- Unidade de SuprarrenalDisciplina de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, BrazilInstituto do Câncer de São Paulo ICESPSão Paulo, BrazilDépartement de MédecineCentre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
| | - Madson Queiroz Almeida
- Unidade de SuprarrenalDisciplina de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, BrazilInstituto do Câncer de São Paulo ICESPSão Paulo, BrazilDépartement de MédecineCentre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada Unidade de SuprarrenalDisciplina de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, BrazilInstituto do Câncer de São Paulo ICESPSão Paulo, BrazilDépartement de MédecineCentre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
| | - Berenice Bilharinho Mendonca
- Unidade de SuprarrenalDisciplina de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, BrazilInstituto do Câncer de São Paulo ICESPSão Paulo, BrazilDépartement de MédecineCentre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
| | - André Lacroix
- Unidade de SuprarrenalDisciplina de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, BrazilInstituto do Câncer de São Paulo ICESPSão Paulo, BrazilDépartement de MédecineCentre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
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Liang L, Schmid K, Sandhu N, Angleson JK, Vijayan MM, Dores RM. Structure/function studies on the activation of the rainbow trout melanocortin-2 receptor. Gen Comp Endocrinol 2015; 210:145-51. [PMID: 24709361 DOI: 10.1016/j.ygcen.2014.03.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Revised: 03/08/2014] [Accepted: 03/11/2014] [Indexed: 10/25/2022]
Abstract
Functional expression of the rainbow trout (rt) melanocortin-2 receptor (MC2R) in CHO cells requires co-expression with a teleost melanocortin-2 receptor accessory protein (MRAP) such as zebrafish (zf) MRAP. Transiently transfected rtMC2R/zfMRAP1 CHO cells were used to evaluate the efficacy of alanine substituted analogs of hACTH(1-24) in three motifs in the ligand: H(6)F(7)R(8)W(9), G(10)K(11)P(12)V(13)G(14), and K(15)K(16)R(17)R(18)P(19). Alanine substitution at all positions in each motif either completely blocked activation of the receptor (H(6)F(7)R(8)W(9) and K(15)K(16)R(17)R(18)P(19)) or resulted in just over 400 fold increase in EC50 value (G(10)K(11)P(12)V(13)G(14)). Single alanine substitutions in the H(6)F(7)R(8)W(9) motif indicated that substitution at either W(9) or R(8) resulted in a much larger increase in EC50 values as compared to substitutions at either F(7) or W(9). Alanine substitution at either K(15)K(16) or R(17)R(18)P(19) in the K(15)K(16)R(17)R(18)P(19) motif resulted in a statistically equivalent increase in EC50 value of at least 600 fold. Finally, alanine substitutions in the G(10)K(11)P(12)V(13)G(14) motif resulted in increases in EC50 values presumably as a result of altering the secondary structure of the ligand. However, truncated analogs of hACTH(1-24) in which either G(10)G(14) (ACTH(1-22), or K(11)P(12)V(13) (ACTH(1-21) were removed had no stimulatory activity. Finally, some of the hACTH(1-24) analogs were tested using rainbow trout head kidney pieces in vitro to confirm whether the response to analogs seen with the transient transfected rtMC2R CHO cells was similar to that of trout interrenal cells. The results of these alanine substitution analog studies are used to construct a multistep hypothetical model for the activation of teleost and tetrapod MC2Rs to account for the unique ligand selectivity of this receptor.
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Affiliation(s)
- Liang Liang
- University of Denver, Department of Biological Sciences, Denver, CO 80210, USA
| | - Kristin Schmid
- University of Denver, Department of Biological Sciences, Denver, CO 80210, USA
| | - Navdeep Sandhu
- University of Calgary, Department of Biological Sciences, Calgary, Canada
| | - Joseph K Angleson
- University of Denver, Department of Biological Sciences, Denver, CO 80210, USA
| | | | - Robert M Dores
- University of Denver, Department of Biological Sciences, Denver, CO 80210, USA.
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Kasahara E, Sekiyama A, Hori M, Kuratsune D, Fujisawa N, Chida D, Hiramoto K, Li J, Okamura H, Inoue M, Kitagawa S. Stress-Induced Glucocorticoid Release Upregulates Uncoupling Protein-2 Expression and Enhances Resistance to Endotoxin-Induced Lethality. Neuroimmunomodulation 2015; 22:279-92. [PMID: 26074181 DOI: 10.1159/000368802] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 10/02/2014] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE Although psychological and/or physiological stress has been well documented to influence immune responses, the precise mechanism for immunomodulation remains to be elucidated. The present work describes the role of the hypothalamic-pituitary-adrenal (HPA) axis in the mechanism of stress-mediated enhanced-resistance to lethality after lipopolysaccharide (LPS) injection. METHODS/RESULTS Preconditioning with restraint stress (RS) resulted in enhanced activation of the HPA axis in response to LPS injection and suppressed LPS-induced release of proinflammatory cytokines and nitric oxide metabolites. Melanocortin 2 receptor-deficient mice (MC2R(-/-)) failed to increase plasma levels of glucocorticoids in response to LPS injection, and exhibited high sensitivity to LPS-induced lethality with enhanced release of proinflammatory cytokines as compared with MC2R(+/-) mice. Real-time PCR analysis revealed that RS induced upregulation of uncoupling protein-2 (UCP2) in macrophages in the lung and the liver of MC2R(+/-), but not of MC2R(-/-), mice. In addition, RS increased UCP2-dependent uncoupling activity of isolated mitochondria from the liver of MC2R(+/-), but not of MC2R(-/-), mice. In vitro study revealed that corticosterone and dexamethasone directly increased UCP2 expression in mouse RAW 264.7 macrophages and suppressed the generation of LPS-induced mitochondrial reactive oxygen species (ROS) and TNF-α production. Knockdown of UCP2 by small interfering RNA blunted the dexamethasone action for suppressing LPS-induced mitochondrial ROS and TNF-α production. CONCLUSION The present work suggests that RS enhances activation of the HPA axis to release glucocorticoids and upregulation of UCP2 in macrophages, thereby increasing the resistance to endotoxin-induced systemic inflammation and death.
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MESH Headings
- Adrenocorticotropic Hormone/metabolism
- Animals
- Cell Line, Transformed
- Corticosterone/metabolism
- Cytokines/metabolism
- Disease Models, Animal
- Glucocorticoids/metabolism
- Ion Channels/metabolism
- Lipopolysaccharides/pharmacology
- Macrophages/drug effects
- Macrophages/metabolism
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- Mitochondria/drug effects
- Mitochondria/metabolism
- Mitochondrial Proteins/metabolism
- Nitric Oxide/metabolism
- RNA, Small Interfering/genetics
- RNA, Small Interfering/metabolism
- Receptor, Melanocortin, Type 2/deficiency
- Receptor, Melanocortin, Type 2/genetics
- Stress, Psychological/metabolism
- Uncoupling Protein 2
- Up-Regulation/drug effects
- Up-Regulation/physiology
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Affiliation(s)
- Emiko Kasahara
- Department of Physiology, Graduate School of Medicine, Osaka City University, Osaka, Japan
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29
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Boonen E, Langouche L, Janssens T, Meersseman P, Vervenne H, De Samblanx E, Pironet Z, Van Dyck L, Vander Perre S, Derese I, Van den Berghe G. Impact of duration of critical illness on the adrenal glands of human intensive care patients. J Clin Endocrinol Metab 2014; 99:4214-22. [PMID: 25062464 DOI: 10.1210/jc.2014-2429] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Adrenal insufficiency is considered to be prevalent during critical illness, although the pathophysiology, diagnostic criteria, and optimal therapeutic strategy remain controversial. During critical illness, reduced cortisol breakdown contributes substantially to elevated plasma cortisol and low plasma ACTH concentrations. OBJECTIVE Because ACTH has a trophic impact on the adrenal cortex, we hypothesized that with a longer duration of critical illness, subnormal ACTH adrenocortical stimulation predisposes to adrenal insufficiency. DESIGN, SETTING AND PARTICIPANTS Adrenal glands were harvested 24 hours or sooner after death from 13 long intensive care unit (ICU)-stay patients, 27 short ICU-stay patients, and 13 controls. Prior glucocorticoid treatment was excluded. MAIN OUTCOME AND MEASURE(S): Microscopic adrenocortical zonational structure was evaluated by hematoxylin and eosin staining. The amount of adrenal cholesterol esters was determined by Oil-Red-O staining, and mRNA expression of ACTH-regulated steroidogenic enzymes was quantified. RESULTS The adrenocortical zonational structure was disturbed in patients as compared with controls (P < .0001), with indistinguishable adrenocortical zones present only in long ICU-stay patients (P = .003 vs. controls). Adrenal glands from long ICU-stay patients, but not those of short ICU-stay patients, contained 21% less protein (P = .03) and 9% more fluid (P = .01) than those from controls, whereas they tended to weigh less for comparable adrenal surface area. There was 78% less Oil-Red-O staining in long ICU-stay patients than in controls and in short-stay patients (P = .03), the latter similar to controls (P = .31). The mRNA expression of melanocortin 2 receptor, scavenger-receptor class B, member 1, 3-hydroxy-3-methylglutaryl-CoA reductase, steroidogenic acute regulatory protein, and cytochrome P450 cholesterol side-chain cleavage enzyme was at least 58% lower in long ICU-stay patients than in controls (all P ≤ .03) and of melanocortin 2 receptor, scavenger-receptor class B, member 1, steroidogenic acute regulatory protein, and cytochrome P450 cholesterol side-chain cleavage enzyme at least 53% lower than in short ICU-stay patients (all P ≤ .04), whereas gene expression in short ICU-stay patients was similar to controls. CONCLUSION AND RELEVANCE Lipid depletion and reduced ACTH-regulated gene expression in prolonged critical illness suggest that sustained lack of ACTH may contribute to the risk of adrenal insufficiency in long-stay ICU patients.
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Affiliation(s)
- Eva Boonen
- Clinical Division and Laboratory of Intensive Care Medicine (E.B., L.L., T.J., H.V., E.D.S., Z.P., L.V.D., S.V.P.I.D., G.V.d.B.), Department Cellular and Molecular Medicine, and Clinical Department of Internal Medicine (P.M.), University of Leuven (KU Leuven), B-3000 Leuven, Belgium
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Abstract
The proteolysis of the pro-opiomelanocortin precursor results in the formation of melanocortins (MCs), a group of peptides that share the conserved -H-F-R-W- sequence, which acts as a pharmacophore for five subtypes of MC receptors (MCRs). MC type 2 receptor (MC2R; also known as ACTHR) is the most specialized of all the MCRs. It is predominantly expressed in the adrenal cortex and specifically binds ACTH. Unlike other MCRs, it requires melanocortin receptor accessory protein 1 (MRAP) for formation of active receptor and for its transport to the cell membrane. The molecular mechanisms underlying this specificity remain poorly understood. In this study, we used directed mutagenesis to investigate the role of various short MC2R sequence segments in receptor membrane trafficking and specific activation upon stimulation with ligands. The strategy of the study was to replace two to five amino acid residues within one MC2R segment with the corresponding residues of MC4R. In total, 20 recombinant receptors C-terminally fused to enhanced green fluorescent protein were generated and their membrane trafficking efficiencies and cAMP response upon stimulation with α-MSH and ACTH(1-24) were estimated during their stand-alone expression and coexpression with MRAP. Our results indicate that both the motif that determines the ligand-recognition specificity and the intracellular retention signal are formed by a specific extracellular structure, which is supported by the correct alignment of the transmembrane domains. Our results also indicate that the aromatic-residue-rich segment of the second extracellular loop is involved in the effects mediated by the second ACTH pharmacophore (-K-K-R-R-).
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Affiliation(s)
- Davids Fridmanis
- Latvian Biomedical Research and Study CentreRatsupites 1, LV-1067 Riga, LatviaDepartment of NeuroscienceUppsala University, BMC, PO Box 593, SE751 24 Uppsala, Sweden
| | - Ramona Petrovska
- Latvian Biomedical Research and Study CentreRatsupites 1, LV-1067 Riga, LatviaDepartment of NeuroscienceUppsala University, BMC, PO Box 593, SE751 24 Uppsala, Sweden
| | - Dace Pjanova
- Latvian Biomedical Research and Study CentreRatsupites 1, LV-1067 Riga, LatviaDepartment of NeuroscienceUppsala University, BMC, PO Box 593, SE751 24 Uppsala, Sweden
| | - Helgi B Schiöth
- Latvian Biomedical Research and Study CentreRatsupites 1, LV-1067 Riga, LatviaDepartment of NeuroscienceUppsala University, BMC, PO Box 593, SE751 24 Uppsala, Sweden
| | - Janis Klovins
- Latvian Biomedical Research and Study CentreRatsupites 1, LV-1067 Riga, LatviaDepartment of NeuroscienceUppsala University, BMC, PO Box 593, SE751 24 Uppsala, Sweden
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31
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Bouw E, Huisman M, Neggers SJCMM, Themmen APN, van der Lely AJ, Delhanty PJD. Development of potent selective competitive-antagonists of the melanocortin type 2 receptor. Mol Cell Endocrinol 2014; 394:99-104. [PMID: 25017734 DOI: 10.1016/j.mce.2014.07.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 06/16/2014] [Accepted: 07/03/2014] [Indexed: 11/16/2022]
Abstract
Cushing's disease, a hypercortisolemic state induced by an ACTH overexpressing pituitary adenoma, causes increased morbidity and mortality. Selective antagonism of the melanocortin type 2 receptor (MC2R) may be a novel treatment modality. Five structurally related peptides with modified HFRW sites but intact putative MC2R binding sites were tested for antagonistic activity at MC1R, MC2R/MRAP, MC3R, MC4R and MC5R. Two of these peptides (GPS1573 and GPS1574) dose-dependently antagonized ACTH-stimulated MC2R activity (IC50s of 66±23 nM and 260±1 nM, respectively). GPS1573 and 1574 suppressed the Rmax but not EC50 of ACTH on MC2R, indicating non-competitive antagonism. These peptides did not antagonize α-MSH stimulation of MC1R and antagonized MC3, 4 and 5R at markedly lower potency. GP1573 and GPS1574 antagonize MC4R with IC50s of 950 nM and 3.7 μM, respectively. In conclusion, two peptide antagonists were developed with selectivity for MC2R, forming a platform for development of a medical treatment for Cushing's disease.
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MESH Headings
- Adrenocorticotropic Hormone/genetics
- Adrenocorticotropic Hormone/metabolism
- Adrenocorticotropic Hormone/pharmacology
- Amino Acid Sequence
- Dose-Response Relationship, Drug
- Drug Design
- Gene Expression
- HEK293 Cells
- Humans
- Molecular Sequence Data
- Peptides/chemical synthesis
- Peptides/pharmacology
- Pituitary ACTH Hypersecretion/drug therapy
- Protein Binding
- Receptor, Melanocortin, Type 1/chemistry
- Receptor, Melanocortin, Type 1/genetics
- Receptor, Melanocortin, Type 1/metabolism
- Receptor, Melanocortin, Type 2/antagonists & inhibitors
- Receptor, Melanocortin, Type 2/chemistry
- Receptor, Melanocortin, Type 2/genetics
- Receptor, Melanocortin, Type 2/metabolism
- Receptor, Melanocortin, Type 3/chemistry
- Receptor, Melanocortin, Type 3/genetics
- Receptor, Melanocortin, Type 3/metabolism
- Receptor, Melanocortin, Type 4/chemistry
- Receptor, Melanocortin, Type 4/genetics
- Receptor, Melanocortin, Type 4/metabolism
- Receptors, Melanocortin/chemistry
- Receptors, Melanocortin/genetics
- Receptors, Melanocortin/metabolism
- Structure-Activity Relationship
- Transfection
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Affiliation(s)
- Elise Bouw
- Department of Internal Medicine, Erasmus MC, 3000 CA Rotterdam, The Netherlands
| | - Martin Huisman
- Department of Internal Medicine, Erasmus MC, 3000 CA Rotterdam, The Netherlands
| | | | - Axel P N Themmen
- Department of Internal Medicine, Erasmus MC, 3000 CA Rotterdam, The Netherlands
| | - A J van der Lely
- Department of Internal Medicine, Erasmus MC, 3000 CA Rotterdam, The Netherlands
| | - Patric J D Delhanty
- Department of Internal Medicine, Erasmus MC, 3000 CA Rotterdam, The Netherlands.
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Jeffrey JD, Cooke SJ, Gilmour KM. Regulation of hypothalamic-pituitary-interrenal axis function in male smallmouth bass (Micropterus dolomieu) during parental care. Gen Comp Endocrinol 2014; 204:195-202. [PMID: 24879931 DOI: 10.1016/j.ygcen.2014.05.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 04/23/2014] [Accepted: 05/12/2014] [Indexed: 11/15/2022]
Abstract
Male smallmouth bass (Micropterus dolomieu) provide sole parental care until offspring reach independence, a period of several weeks. During the early parental care period when males are guarding fresh eggs (MG-FE), cortisol responsiveness is attenuated; the response is re-established when males reach the end of the parental care period and are guarding free-swimming fry (MG-FSF). It was hypothesized that attenuation of the cortisol response in male smallmouth bass during early parental care reflected modulation of hypothalamic-pituitary-interrenal (HPI) axis function. Male smallmouth bass were sampled at the beginning (MG-FE) and end of the parental care period (MG-FSF), before and/or 25 min after exposure to a standardized stressor consisting of 3 min of air exposure. Repeated sampling of stressed fish for analysis of plasma cortisol and adrenocorticotropic hormone (ACTH) levels was carried out. Males significantly elevated both plasma cortisol and ACTH levels when guarding free-swimming fry but not during early parental care. Control and stressed fish were terminally sampled for tissue mRNA abundance of preoptic area (POA) and hypothalamic corticotropin-releasing factor (CRF) as well as head kidney melanocortin 2 receptor (MC2R), steroidogenic acute regulatory protein (StAR) and cytochrome P450 side chain cleavage enzyme (P450scc). No significant differences in either hypothalamus CRF or head kidney P450scc mRNA abundance were found across parental care stages or in response to stress. However, POA CRF mRNA abundance and interrenal cell MC2R and StAR mRNA abundances failed to increase in response to stress in MG-FE. Thus, the attenuated cortisol response in males guarding fresh eggs may be explained by hypoactive HPI axis function in response to stress. The present is one of few studies, and the first teleost study, to address the mechanisms underlying resistance to stress during the reproductive/parental care period.
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Affiliation(s)
- J D Jeffrey
- Department of Biology, University of Ottawa, Ottawa, ON, Canada.
| | - S J Cooke
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada
| | - K M Gilmour
- Department of Biology, University of Ottawa, Ottawa, ON, Canada
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Abstract
Following the biochemical characterization of the pituitary hormone, adrenocorticotropin (ACTH), in the 1950's, a number of structure/function studies were done which identifies two amino acid motifs in ACTH, the HFRW motif and KKRR motif, as critical for the activation of the "ACTH" receptor on adrenal cortex cells. In the 1990's the "ACTH" receptor was identified as a member of the melanocortin receptor gene family, and given the name melanocortin-2 receptor (MC2R). Since that time a number of studies on both tetrapod and teleost MC2R orthologs have established that these orthologs can only be activated by ACTH, but not by any of the MSH-sized melanocortin ligands, and these orthologs require interaction with the melanocortin-2 receptor accessory protein (MRAP) for functional expression. This review summarizes recent structure/function studies on human ACTH, and points out the importance of the GKPVG motif in ACTH for the activation of the receptor. In this regard, a multiple-step model for the activation of tetrapod and teleost MC2R orthologs is presented, and the evolution of gnathostome MC2R ligand selectivity and the requirement for MRAP interaction is discussed in light of a recent study on a cartilaginous fish MC2R ortholog. This review contains excerpts from the Gorbman/Bern Lecture presented at the Second Meeting of the North American Society for Comparative Endocrinology (NASCE).
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Affiliation(s)
- Robert M Dores
- University of Denver, Department of Biological Sciences, Denver, CO 80210, USA.
| | - Liang Liang
- University of Denver, Department of Biological Sciences, Denver, CO 80210, USA
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Kameda H, Miyoshi H, Shimizu C, Nagai S, Nakamura A, Kondo T, Chida D, Atsumi T. Expression and regulation of neuromedin B in pituitary corticotrophs of male melanocortin 2 receptor-deficient mice. Endocrinology 2014; 155:2492-9. [PMID: 24742195 DOI: 10.1210/en.2013-2077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The hypothalamic-pituitary-adrenal (HPA) axis is a major part of the neuroendocrine system that controls responses to stress, and has an important function in the regulation of various body processes. We previously created a mouse line deficient in the melanocortin 2 receptor (MC2R). MC2R-deficient mice (MC2R(-/-) mice) have high adrenocorticotropic hormone (ACTH) levels because of undetectable corticosterone levels. Increased neuromedin B (NMB) expression was recently reported in the pituitary gland of adrenalectomized mice, a model for acute adrenal insufficiency. To investigate gene expression in the pituitary gland under chronic adrenal deficiency, we examined the pituitary gland of MC2R(-/-) mice, a model of chronic adrenal insufficiency. To understand the molecular background of pituitary cells under chronic adrenal deficiency, we first performed DNA microarray analyses using the pituitary glands of the MC2R(-/-) mice. The DNA microarray analysis and real-time polymerase chain reaction showed that NMB expression was higher in the MC2R(-/-) than in the wild-type (WT) mice. We detected NMB expression in the MC2R(-/-) pituitary corticotrophs by immunohistochemistry using the specific antibodies for ACTH and NMB. In addition, the plasma NMB concentration was significantly higher in the MC2R(-/-) mice than in the WT mice. Subcutaneous implantation of a sustained-release corticosterone pellet decreased the expression of NMB mRNA as well as pituitary proopiomelanocortin mRNA. In isolated anterior pituitary cells, NMB mRNA expression was increased by the administration of corticotropin-releasing hormone (CRH) and was suppressed by dexamethasone treatment. In this study, we first demonstrate NMB expression in corticotrophs and its regulation by CRH and glucocorticoids. Furthermore, corticotrophs seemed to secrete NMB into the systemic circulation.
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Affiliation(s)
- Hiraku Kameda
- Division of Rheumatology, Endocrinology and Nephrology (H.K., H.M., A.N., T.K., T.A.), Hokkaido University Graduate School of Medicine, N 15, W 7, Kita-ku, Sapporo, Hokkaido 060-8638, Japan; Division of Laboratory and Transfusion Medicine (C.S.), Hokkaido University Hospital, N 14, W 5, Kita-ku, Sapporo, Hokkaido 060-8648 Japan; Department of Diabetes and Endocrinology (S.N.), Sapporo Medical Center; NTT EC, S 1, W 15, Chuoh-Ku, Sapporo, Hokkaido 060-0061, Japan; and Faculty of Medicine (D.C.), Saitama Medical University, 38 Morohongo, Moroyama-machi, Iruma-gun, Saitama 350-0495, Japan
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Almeida MQ, Kaupert LC, Brito LP, Lerario AM, Mariani BMP, Ribeiro M, Monte O, Denes FT, Mendonca BB, Bachega TASS. Increased expression of ACTH (MC2R) and androgen (AR) receptors in giant bilateral myelolipomas from patients with congenital adrenal hyperplasia. BMC Endocr Disord 2014; 14:42. [PMID: 24884994 PMCID: PMC4024625 DOI: 10.1186/1472-6823-14-42] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 05/08/2014] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Although chronic adrenocorticotropic hormone (ACTH) and androgen hyperstimulation are assumed to be involved in the pathogenesis of adrenal myelolipomas associated with poor-compliance patients with congenital adrenal hyperplasia (CAH), the expression of their receptors has not yet been demonstrated in these tumors so far. METHODS We analyzed Melanocortin 2 receptor (MC2R), Androgen Receptor (AR), Leptin (LEP), and Steroidogenic factor 1 (SF1) expression using real-time qRT-PCR in two giant bilateral adrenal myelolipomas from two untreated simple virilizing CAH cases and in two sporadic adrenal myelolipomas. In addition, the X-chromosome inactivation pattern and CAG repeat numbers in AR exon 1 gene were evaluated in the 4 cases. RESULTS The MC2R gene was overexpressed in myelolipomas from 3 out of 4 patients. AR overexpression was detected in 2 tumors: a giant bilateral myelolipoma in a CAH patient and a sporadic case. Simultaneous overexpression of AR and MC2R genes was found in two of the cases. Interestingly, the bilateral giant myelolipoma associated with CAH that had high androgen and ACTH levels but lacked MC2R and AR overexpression presented a significantly shorter AR allele compared with other tumors. In addition, X-chromosome inactivation pattern analysis showed a polyclonal origin in all tumors, suggesting a stimulatory effect as the trigger for tumor development. CONCLUSION These findings are the first evidence for MC2R or AR overexpression in giant bilateral myelolipomas from poor-compliance CAH patients.
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Affiliation(s)
- Madson Q Almeida
- Divisão de Endocrinologia e Metabologia, Laboratório de Hormônios e Genética Molecular/LIM42, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Av. Dr. Enéas de Carvalho Aguiar, 155, 2 andar, Bloco 6, São Paulo, SP 05403-900, Brasil
- Instituto do Câncer do Estado de São Paulo (ICESP), Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brasil
| | - Laura C Kaupert
- Divisão de Endocrinologia e Metabologia, Laboratório de Hormônios e Genética Molecular/LIM42, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Av. Dr. Enéas de Carvalho Aguiar, 155, 2 andar, Bloco 6, São Paulo, SP 05403-900, Brasil
| | - Luciana P Brito
- Divisão de Endocrinologia e Metabologia, Laboratório de Hormônios e Genética Molecular/LIM42, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Av. Dr. Enéas de Carvalho Aguiar, 155, 2 andar, Bloco 6, São Paulo, SP 05403-900, Brasil
| | - Antonio M Lerario
- Divisão de Endocrinologia e Metabologia, Laboratório de Hormônios e Genética Molecular/LIM42, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Av. Dr. Enéas de Carvalho Aguiar, 155, 2 andar, Bloco 6, São Paulo, SP 05403-900, Brasil
| | - Beatriz M P Mariani
- Divisão de Endocrinologia e Metabologia, Laboratório de Hormônios e Genética Molecular/LIM42, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Av. Dr. Enéas de Carvalho Aguiar, 155, 2 andar, Bloco 6, São Paulo, SP 05403-900, Brasil
| | - Marta Ribeiro
- Unidade de Endocrinologia e Metabologia, Departamento de Clínica Médica, Faculdade de Ciências Médicas da Santa Casa de Misericórdia de São Paulo, São Paulo, Brasil
| | - Osmar Monte
- Unidade de Endocrinologia e Metabologia, Departamento de Clínica Médica, Faculdade de Ciências Médicas da Santa Casa de Misericórdia de São Paulo, São Paulo, Brasil
| | - Francisco T Denes
- Serviço de Urologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brasil
| | - Berenice B Mendonca
- Divisão de Endocrinologia e Metabologia, Laboratório de Hormônios e Genética Molecular/LIM42, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Av. Dr. Enéas de Carvalho Aguiar, 155, 2 andar, Bloco 6, São Paulo, SP 05403-900, Brasil
| | - Tânia ASS Bachega
- Divisão de Endocrinologia e Metabologia, Laboratório de Hormônios e Genética Molecular/LIM42, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Av. Dr. Enéas de Carvalho Aguiar, 155, 2 andar, Bloco 6, São Paulo, SP 05403-900, Brasil
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36
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Abstract
Despite clear physiological duress, rainbow trout (Oncorhynchus mykiss) infected with the pathogenic haemoflagellate Cryptobia salmositica do not appear to mount a cortisol stress response. Therefore, we hypothesized that the infection suppresses the stress response by inhibiting the key effectors of the hypothalamic-pituitary-interrenal (HPI) axis. To test this, we characterized the basal activity of the HPI axis and the cortisol response to air exposure in saline- and parasite-injected fish. All fish were sampled at 4 and 6 weeks post-injection (wpi). While both the treatment groups had resting plasma cortisol levels, the parasite-infected fish had lower levels of plasma ACTH than the control fish. Relative to the control fish, the infected fish had higher mRNA levels of brain pre-optic area corticotrophin-releasing factor (CRF) and pituitary CRF receptor type 1, no change in pituitary POMC-A1, -A2 and -B gene expression, higher and lower head kidney melanocortin 2 receptor mRNA levels at 4 and 6 wpi respectively and reduced gene expression of key proteins regulating interrenal steroidogenesis: StAR, cytochrome P450scc and 11β-hydroxylase. The parasite-infected fish also had a reduced plasma cortisol response to a 60-s air exposure stressor. Superfusion of the head kidney tissues of the parasite-infected fish led to significantly lower ACTH-stimulated cortisol release rates than that observed in the control fish. These novel findings show that infection of rainbow trout with C. salmositica results in complex changes in the transcriptional activity of both central and peripheral regulators of the HPI axis and in a reduction in the interrenal capacity to synthesize cortisol.
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Affiliation(s)
- Barry N Madison
- Department of Integrative Biology, University of Guelph, 50 Stone Road East, Guelph, Ontario, Canada N1G 2W1
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37
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Davis P, Franquemont S, Liang L, Angleson JK, Dores RM. Evolution of the melanocortin-2 receptor in tetrapods: studies on Xenopus tropicalis MC2R and Anolis carolinensis MC2R. Gen Comp Endocrinol 2013; 188:75-84. [PMID: 23639234 DOI: 10.1016/j.ygcen.2013.04.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 04/05/2013] [Accepted: 04/06/2013] [Indexed: 12/25/2022]
Abstract
The tetrapods are a diverse assemblage of vertebrates, and that diversity is reflected in the sequences of tetrapod melanocortin-2 receptors (MC2Rs). In this review, the features common to human (mammal), Gallus gallus (bird), Anolis carolinensis (reptile), and Xenopus tropicalis (amphibian) MC2Rs in terms of ligand selectivity, requirements for interaction with MRAP1, and the effects of alanine substitutions to three amino acid motifs in the ligand hACTH(1-24) are discussed. Analysis of the effects of alanine substitutions to the H(6)F(7)R(8)W(9) and the K(15)K(16)R(17)R(18)P(19) motifs of hACTH(1-24) indicated that activation of A. carolinensis MC2R and X. tropicalis MC2R was more adversely affected by alanine substitutions at these positions as compared to the response of human MC2R to these same analogs. Furthermore, single alanine substitutions in the G(10)K(11)P(12)V(13)G(14) motif of hACTH(1-24) had negative affects on activation of both A. carolinensis MC2R and X. tropicalis MC2R that were not observed for human MC2R. The implications of responses to the various analogs of hACTH(1-24) in terms of the mechanism for mediating the activation of these various tetrapod melanocortin-2 receptors are discussed.
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Affiliation(s)
- Perry Davis
- University of Denver, Department of Biological Sciences, Denver, CO 80210, USA
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38
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Agulleiro MJ, Sánchez E, Leal E, Cortés R, Fernández-Durán B, Guillot R, Davis P, Dores RM, Gallo-Payet N, Cerdá-Reverter JM. Molecular characterization and functional regulation of melanocortin 2 receptor (MC2R) in the sea bass. A putative role in the adaptation to stress. PLoS One 2013; 8:e65450. [PMID: 23724142 PMCID: PMC3664627 DOI: 10.1371/journal.pone.0065450] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Accepted: 04/25/2013] [Indexed: 01/11/2023] Open
Abstract
The activation of melanocortin 2 receptor (MC2R) by ACTH mediates the signaling cascade leading to steroid synthesis in the interrenal tissue (analogous to the adrenal cortex in mammals) of fish. However, little is known about the functional regulation of this receptor in fish. In this work described, we cloned sea bass MC2R from a liver cDNA. SbMC2R requires the melanocortin 2 receptor accessory protein (MRAP) for its functional expression. Dietary cortisol but not long-term stress protocols downregulated interrenal sbMC2R expression. Data suggest the existence of a negative feedback on interrenal sbMC2R expression imposed by local or systemic glucocorticoids. This feedback could be involved in long-term stress adaptation by regulating interrenal sensitivity to ACTH. ACTH-induced MC2R activation stimulates hepatic lipolysis, suggesting that ACTH may mediate stress-induced effects upstream of cortisol release.
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MESH Headings
- Adaptation, Biological/genetics
- Adrenocorticotropic Hormone/pharmacology
- Amino Acid Sequence
- Animals
- Bass/genetics
- Bass/metabolism
- CHO Cells
- Cloning, Molecular
- Cricetulus
- Fasting
- Gene Expression
- Gene Expression Regulation/drug effects
- Lipid Metabolism/drug effects
- Liver/drug effects
- Liver/metabolism
- Molecular Sequence Data
- Organ Specificity/genetics
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Receptor, Melanocortin, Type 2/agonists
- Receptor, Melanocortin, Type 2/chemistry
- Receptor, Melanocortin, Type 2/genetics
- Receptor, Melanocortin, Type 2/metabolism
- Sequence Alignment
- Stress, Physiological/genetics
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Affiliation(s)
- Maria Josep Agulleiro
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas (IATS-CSIC), Castellón, Spain
| | - Elisa Sánchez
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas (IATS-CSIC), Castellón, Spain
| | - Esther Leal
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas (IATS-CSIC), Castellón, Spain
| | - Raúl Cortés
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas (IATS-CSIC), Castellón, Spain
| | - Begoña Fernández-Durán
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas (IATS-CSIC), Castellón, Spain
| | - Raúl Guillot
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas (IATS-CSIC), Castellón, Spain
| | - Perry Davis
- Department of Biological Sciences, University of Denver, Denver, Colorado, United States of America
| | - Robert M. Dores
- Department of Biological Sciences, University of Denver, Denver, Colorado, United States of America
| | - Nicole Gallo-Payet
- Department of Medicine, University of Sherbrooke, Sherbrooke, Québec, Canada
| | - José Miguel Cerdá-Reverter
- Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre de la Sal, Consejo Superior de Investigaciones Científicas (IATS-CSIC), Castellón, Spain
- * E-mail:
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39
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Meimaridou E, Hughes CR, Kowalczyk J, Guasti L, Chapple JP, King PJ, Chan LF, Clark AJL, Metherell LA. Familial glucocorticoid deficiency: New genes and mechanisms. Mol Cell Endocrinol 2013; 371:195-200. [PMID: 23279877 DOI: 10.1016/j.mce.2012.12.010] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Revised: 12/11/2012] [Accepted: 12/14/2012] [Indexed: 01/03/2023]
Abstract
Familial Glucocorticoid deficiency (FGD), in which the adrenal cortex fails to produce glucocorticoids, was first shown to be caused by defects in the receptor for ACTH (MC2R) or its accessory protein (MRAP). Certain mutations in the steroidogenic acute regulatory protein (STAR) can also masquerade as FGD. Recently mutations in mini chromosome maintenance-deficient 4 homologue (MCM4) and nicotinamide nucleotide transhydrogenase (NNT), genes involved in DNA replication and antioxidant defence respectively, have been recognised in FGD cohorts. These latest findings expand the spectrum of pathogenetic mechanisms causing adrenal disease and imply that the adrenal may be hypersensitive to replicative and oxidative stresses. Over time patients with MCM4 or NNT mutations may develop other organ pathologies related to their impaired gene functions and will therefore need careful monitoring.
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Affiliation(s)
- Eirini Meimaridou
- Queen Mary University of London, Centre for Endocrinology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, London, UK
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40
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Abstract
The circadian rhythm of corticosterone (CORT) secretion from the adrenal cortex is regulated by the suprachiasmatic nucleus (SCN), which is entrained to the light-dark cycle. Since the circadian CORT rhythm is associated with circadian expression of the steroidogenic acute regulatory (StAR) protein, we investigated the 24h pattern of hormonal secretion (ACTH and CORT), steroidogenic gene expression (StAR, SF-1, DAX1 and Nurr77) and the expression of genes involved in ACTH signalling (MC2R and MRAP) in rats entrained to a normal light-dark cycle. We found that circadian changes in ACTH and CORT were associated with the circadian expression of all gene targets; with SF-1, Nurr77 and MRAP peaking in the evening, and DAX1 and MC2R peaking in the morning. Since disruption of normal SCN activity by exposure to constant light abolishes the circadian rhythm of CORT in the rat, we also investigated whether the AM-PM variation of our target genes was also disrupted in rats exposed to constant light conditions for 5weeks. We found that the disruption of the AM-PM variation of ACTH and CORT secretion in rats exposed to constant light was accompanied by a loss of AM-PM variation in StAR, SF-1 and DAX1, and a reversed AM-PM variation in Nurr77, MC2R and MRAP. Our data suggest that circadian expression of StAR is regulated by the circadian expression of nuclear receptors and proteins involved in both ACTH signalling and StAR transcription. We propose that ACTH regulates the secretion of CORT via the circadian control of steroidogenic gene pathways that become dysregulated under the influence of constant light.
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Affiliation(s)
- Shin Y Park
- Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology, School of Clinical Sciences, University of Bristol, Dorothy Hodgkin Building, Whitson Street, Bristol BS1 3NY, UK
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41
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Samuels ME, Gallo-Payet N, Pinard S, Hasselmann C, Magne F, Patry L, Chouinard L, Schwartzentruber J, René P, Sawyer N, Bouvier M, Djemli A, Delvin E, Huot C, Eugene D, Deal CL, Van Vliet G, Majewski J, Deladoëy J. Bioinactive ACTH causing glucocorticoid deficiency. J Clin Endocrinol Metab 2013; 98:736-42. [PMID: 23293326 DOI: 10.1210/jc.2012-3199] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT A 4-year-old girl and a 4-month-old boy presented with hypoglycemia, normal electrolytes, low cortisol, and high ACTH. A diagnosis of primary adrenal insufficiency was made and initial treatment was with glucocorticoids and mineralocorticoids. The genes known to cause ACTH resistance were normal. Whole exome sequencing revealed that the girl was compound heterozygous for POMC mutations: one previously described null allele and one novel p.R8C mutation in the sequence encoding ACTH and α-MSH. The boy was homozygous for the p.R8C mutation. HYPOTHESIS The p.R8C ACTH mutant is immunoreactive, but the mutant peptides, ACTH-R8C and α-MSH-R8C, are bioinactive. METHODS Methods included whole exome sequencing, Sanger sequencing, peptide synthesis, ACTH immunoradiometric assay, hormone binding, and activation assays in cells expressing melanocortin receptors. RESULTS ACTH-R8C was immunoreactive but failed to bind and activate cAMP production in melanocortin-2 receptor (MC2R)-expressing cells, and α-MSH-R8C failed to bind and stimulate cAMP production in MC1R- and MC4R-expressing cells. CONCLUSION These are the first documented cases of glucocorticoid deficiency due to the secretion of an ACTH molecule that lacks biological bioactivity but conserves immunoreactivity. POMC mutations should thus be considered in patients presenting with apparent ACTH resistance. Our findings also highlight a limitation to immunoassay-based diagnostics and demonstrate the value of genetic analysis. Establishing the molecular etiology of the disorder in our patients allowed cessation of the unnecessary mineralocorticoids. Finally, discovery of this mutation indicates that in humans, the amino acid sequence His(6)Phe(7)Arg(8)Trp(9) is important not only for cAMP activation but also for ACTH binding to MC2R.
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Affiliation(s)
- Mark E Samuels
- Endocrinology Service and Research Center, Centre Hospitalier Universitaire Sainte-Justine, Department of Pediatrics, University of Montreal, Montreal H3T 1C5, Canada
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42
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Abstract
ACTH resistance is a rare disorder typified by familial glucocorticoid deficiency (FGD), a genetically heterogeneous disease. Previously, genetic defects in FGD have been identified in the ACTH receptor gene (MC2R), its accessory protein (MRAP) and the steroidogenic acute regulatory protein gene (STAR). The defective mechanisms here are failures in ACTH ligand binding and/or receptor trafficking for MC2R and MRAP and, in the case of STAR mutations, inefficient cholesterol transport to allow steroidogenesis to proceed. Novel gene defects in FGD have recently been recognised in mini-chromosome maintenance-deficient 4 homologue (MCM4) and nicotinamide nucleotide transhydrogenase (NNT). MCM4 is one part of a DNA repair complex essential for DNA replication and genome stability, whilst NNT is involved in the glutathione redox system that protects cells against reactive oxygen species. The finding of mutations in these two genes implicates new pathogenetic mechanisms at play in FGD, and implies that the adrenal cortex is exquisitely sensitive to replicative and oxidative stresses.
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Affiliation(s)
- E Meimaridou
- Centre for Endocrinology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
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43
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Li Z, Yin N, Liu Q, Wang C, Wang T, Wang Y, Qu G, Liu J, Cai Y, Zhou Q, Jiang G. Effects of polycyclic musks HHCB and AHTN on steroidogenesis in H295R cells. Chemosphere 2013; 90:1227-1235. [PMID: 23084589 DOI: 10.1016/j.chemosphere.2012.09.056] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2012] [Revised: 09/13/2012] [Accepted: 09/16/2012] [Indexed: 06/01/2023]
Abstract
1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8-hexamethylcyclopenta-(γ)-2-benzopyran (HHCB) and 7-acetyl-1,1,3,4,4,6-hexamethyl-1,2,3,4-tetrahydronaphthalene (AHTN) are widely used in personal care products. Previous studies showed that HHCB and AHTN can be found in various environmental matrices and have potential endocrine disrupting effects. However, the effects on adrenocortical function of HHCB and AHTN are not fully understood. This study evaluated the influences of HHCB and AHTN on seven steroid hormones (progesterone, aldosterone, cortisol, 17α-OH-progesterone, androstenedione, 17β-estradiol, and testosterone) and 10 genes involved in steroidogenic pathways (HMGR, StAR, CYP11A1, 3βHSD2, CYP17, CYP21, CYP11B1, CYP11B2, 17βHSD, and CYP19) using the H295R cell line in the absence and presence of 8-Br-cAMP. MC2R transcription on the cell membrane was also examined to further investigate the effects of HHCB and AHTN on adrenal steroidogenesis. The results demonstrated that HHCB and AHTN could inhibit progesterone and cortisol production mainly by the suppression of 3βHSD2 and CYP21. Meanwhile, high concentrations of AHTN can affect the sensitivity of H295R cells to ACTH by disrupting MC2R transcription. Overall, the results indicate that high concentrations of HHCB and AHTN can affect steroidogenesis in vitro using the H295R cell line.
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Affiliation(s)
- Zhuona Li
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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44
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Tyczewska M, Rucinski M, Trejter M, Ziolkowska A, Szyszka M, Malendowicz LK. Angiogenesis in the course of enucleation-induced adrenal regeneration--expression of selected genes and proteins involved in development of capillaries. Peptides 2012; 38:404-13. [PMID: 23041583 DOI: 10.1016/j.peptides.2012.09.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 09/21/2012] [Accepted: 09/24/2012] [Indexed: 01/13/2023]
Abstract
Enucleation-induced rapid proliferation of adrenocortical cells and restoration of adrenals structure requires formation of new blood vessels. The performed studies aimed to select from around 30,000 transcripts, identified by means of Affymetrix(®) Rat Gene 1.1 ST Array, the genes involved in angiogenesis in the course of enucleation-induced adrenal regeneration and to characterize their expression levels in regenerating gland between days 1 and 15 after surgery. At day 1 of regeneration almost 2000 genes showed more than 2-fold up/down-regulation. At days 1-3 after surgery the highest expression demonstrated genes involved in the development of inflammation and blood clot formation. From around 2000 genes we selected genes involved in angiogenesis. During the regeneration 62 genes involved in angiogenesis were identified as up- or down-regulated. Some data were also validated by QPCR. Levels of Vegfa and Kdr (Vegfr-2) mRNAs were very low at day 1 of regeneration and remained unchanged thereafter. The highest expression of Figf gene was found at day 5 while that of Vwf gene at days 1 and 2 after surgery. Levels of Thy1 mRNA increased notably between days 2 and 5 of the experiment. In comparison to control rats, Mc2r (ACTH receptor) expression was lowered at day 1 of the experiment and remained unchanged thereafter. This suggests that enucleation-induced adrenal neoangiogenesis does not require elevated expression of ACTH receptor. Results of our studies strongly suggest that enucleation-induced adrenal regeneration is an angiogenesis-dependent process. Moreover, immunohistochemistry suggests that regenerating adrenal parenchymal cells release numerous angiogenic factors which paracrinally may regulate formation of new vessels.
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Affiliation(s)
- Marianna Tyczewska
- Department of Histology and Embryology, Poznan University of Medical Sciences, Poznan, Poland
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45
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Hoekstra M, van der Sluis RJ, Li Z, Oosterveer MH, Groen AK, Van Berkel TJC. FXR agonist GW4064 increases plasma glucocorticoid levels in C57BL/6 mice. Mol Cell Endocrinol 2012; 362:69-75. [PMID: 22643070 DOI: 10.1016/j.mce.2012.05.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Revised: 05/21/2012] [Accepted: 05/21/2012] [Indexed: 01/09/2023]
Abstract
Since high expression of farnesoid X receptor (FXR) has been detected in glucocorticoid-producing adrenocortical cells, we evaluated the potential role of FXR in adrenal glucocorticoid production. FXR agonist GW4064 increased fasting plasma corticosterone levels (+45%; P<0.01) in C57BL/6 mice, indicative of enhanced adrenal steroidogenesis. GW4064 treatment did not affect plasma ACTH levels, adrenal weight, or adrenal expression of steroidogenic genes. Scavenger receptor BI (SR-BI) mRNA and protein expression, respectively, increased 1.9-fold (P<0.01) and 1.5-fold, which suggests a stimulated lipoprotein-associated cholesterol uptake into the adrenals upon GW4064 treatment. In line with an enhanced flux of cellular cholesterol into the steroidogenic pathway, adrenal unesterified and esterified cholesterol stores were 21-41% decreased (P<0.01) upon GW4064 treatment. In conclusion, we have shown that the FXR agonist GW4064 stimulates plasma corticosterone levels in C57BL/6 mice. Our findings suggest a novel role for FXR in the modulation of adrenal cholesterol metabolism and glucocorticoid synthesis in mice.
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MESH Headings
- Adrenal Glands/anatomy & histology
- Adrenal Glands/drug effects
- Adrenal Glands/metabolism
- Adrenocorticotropic Hormone/blood
- Animals
- Apolipoproteins A/genetics
- Apolipoproteins A/metabolism
- Cholesterol Side-Chain Cleavage Enzyme/genetics
- Cholesterol Side-Chain Cleavage Enzyme/metabolism
- Corticosterone/blood
- Female
- Glucocorticoids/blood
- Isoxazoles/pharmacology
- Lipid Metabolism
- Lipids/blood
- Liver/metabolism
- Membrane Transport Proteins/genetics
- Membrane Transport Proteins/metabolism
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Organ Size/drug effects
- Phosphoenolpyruvate Carboxykinase (ATP)/genetics
- Phosphoenolpyruvate Carboxykinase (ATP)/metabolism
- Progesterone Reductase/genetics
- Progesterone Reductase/metabolism
- Receptor, Melanocortin, Type 2/genetics
- Receptor, Melanocortin, Type 2/metabolism
- Receptors, Cytoplasmic and Nuclear/agonists
- Receptors, Cytoplasmic and Nuclear/genetics
- Receptors, Cytoplasmic and Nuclear/metabolism
- Scavenger Receptors, Class B/genetics
- Scavenger Receptors, Class B/metabolism
- Steroid 11-beta-Hydroxylase/genetics
- Steroid 11-beta-Hydroxylase/metabolism
- Steroid 21-Hydroxylase/genetics
- Steroid 21-Hydroxylase/metabolism
- Tryptophan Oxygenase/genetics
- Tryptophan Oxygenase/metabolism
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Affiliation(s)
- Menno Hoekstra
- Division of Biopharmaceutics, Leiden/Amsterdam Center for Drug Research, Gorlaeus Laboratories, 2300 RA Leiden, The Netherlands.
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46
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Reinick CL, Liang L, Angleson JK, Dores RM. Identification of an MRAP-independent melanocortin-2 receptor: functional expression of the cartilaginous fish, Callorhinchus milii, melanocortin-2 receptor in CHO cells. Endocrinology 2012; 153:4757-65. [PMID: 22919056 PMCID: PMC3512025 DOI: 10.1210/en.2012-1482] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Phylogenetic analyses indicate that the genome of the cartilaginous fish, Callorhynchus milii (elephant shark), encodes a melanocortin-2 receptor (MC2R) ortholog. Expression of the elephant shark mc2r cDNA in Chinese hamster ovary (CHO) cells revealed that trafficking to the plasma membrane and functional activation of the receptor do not require coexpression with an exogenous melanocortin receptor-2 accessory protein (mrap) cDNA. Ligand selectivity studies indicated that elephant shark MC2R-transfected CHO cells produced cAMP in a dose-dependent manner when stimulated with either human ACTH (1-24) or [Nle(4), d-Phe(7)]-MSH. Furthermore, the order of ligand selectivity when elephant shark MC2R-transfected CHO cells were stimulated with cartilaginous fish melanocortins was as follows: ACTH (1-25) = γ-MSH = δ-MSH > αMSH = β-MSH. Elephant shark MC2R is the first vertebrate MC2R ortholog to be analyzed that does not require melanocortin receptor-2 accessory protein 1 for functional activation. In addition, elephant MC2R is currently the only MC2R ortholog that can be activated by either ACTH- or MSH-sized ligands. Hence, it would appear that MC2R dependence on melanocortin receptor-2 accessory protein 1 for functional activation and the exclusive selectivity of this melanocortin receptor for ACTH are features that emerged after the divergence of the ancestral cartilaginous fishes and the ancestral bony fishes more than 400 million years ago.
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Affiliation(s)
- Christina L Reinick
- Department of Biological Sciences, University of Denver, Denver, Colorado 80210, USA
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Betz MJ, Hatiboglu N, Mauracher B, Hadaschik D, Sauter A, Demmelmair H, Koletzko B, Beuschlein F, Slawik M. Mc2 receptor knockdown modulates differentiation and lipid composition in adipocytes. Horm Metab Res 2012; 44:670-5. [PMID: 22723268 DOI: 10.1055/s-0032-1314854] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The melanocortin system is involved in central and peripheral regulation of energy homeostasis. In adipocytes, the melanocortin 2 receptor (MC2R) transmits ACTH-dependent signaling and its expression rises substantially during adipocyte differentiation. An in vitro system of retrovirally expressed shRNA directed against Mc2r mRNA in 3T3-L1 cells was established and effects of Mc2r knockdown (kd) in comparison to cells expressing non-targeting shRNA (control) were explored in differentiated adipocytes. Morphology, gene expression, lipolysis and fatty acid composition were analyzed. While gross morphology was unchanged extractable amount of lipids was reduced to 70-80% in kd cell lines (p<0.01). Moreover, expression changes of Pparγ2, aP2, and Pref1 indicated reduced differentiation in Mc2r kd cells. Intriguingly, not only ACTH, but also norepinephrine stimulated lipolysis were substantially reduced demonstrating functional significance of MC2R for general lipolysis pathway. Analysis of fatty acid composition in triglyceride and phospholipid fractions showed a lowered ratio of C16:1/C16:0 and C18:1/C18:0, but increased concentrations of arachidonic acid upon Mc2r knockdown. Reduction of mono-unsaturated fatty acids (MUFAs) was associated with lower expression of stearoyl-Coenzyme A desaturase 1 and 2 in kd cells (21 ± 8% vs. 100 ± 13%, p=0.01 and 32 ± 3% vs. 100 ± 15%, p=0.046). Conversely, high doses of ACTH resulted in gene expression changes, mirroring Mc2r knockdown (higher Pparγ2, Scd1, Hsl expression). MC2R plays an important role for regular lipolytic function and lipid composition in 3T3-L1 adipocytes. Of interest, desaturase expression was reduced and MUFA content accordingly altered in kd cells.
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Affiliation(s)
- M J Betz
- Endocrine Research Unit, Medizinische Klinik und Poliklinik IV, Munich, Germany
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Evans JF, Fernando A, Ragolia L. Functional melanocortin-2 receptors are expressed by mouse aorta-derived mesenchymal progenitor cells. Mol Cell Endocrinol 2012; 355:60-70. [PMID: 22306084 PMCID: PMC3485690 DOI: 10.1016/j.mce.2012.01.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Revised: 12/21/2011] [Accepted: 01/19/2012] [Indexed: 01/03/2023]
Abstract
A local melanocortin system is active during tissue injury and inflammation. Thus far this system has been described as autocrine in nature where local production of pro-opiomelanocortin (POMC) peptides by leukocytes feeds back on melanocortin receptor (MC-R) expressing immune cells to quell inflammatory cytokine production. Here we present evidence that POMC peptides may generate extracellular matrix (ECM) changes by inducing matrix production by cells of the mesenchymal lineage through activation of the MC2-R. Using immunoblot, we determined that mouse aorta-derived mesenchymal progenitor cells express both MC2-R and MC3-R. These progenitors respond to treatment with ACTH by increasing collagen matrix synthesis as assessed by picrosirius red stain and (3)H-proline incorporation. ACTH also induces transient increases in intracellular calcium ([Ca(2+)](i)) as assessed using the fluorescent Ca(2+) indicator, fura-2. The ACTH-induced changes in [Ca(2+)](i) are consistent with MC2-R signaling and consist of both an intracellular release and an extracellular influx of Ca(2+). Both mouse aortic mesenchymal progenitors and mouse macrophage cells express POMC and the prohormone convertase 1/3 (PC1/3) indicating they have the potential to contribute to the local production of POMC peptides. These data demonstrate functional MC2-R expression in mouse aorta-derived mesenchymal progenitors and implicate both macrophage and mesenchymal cells as relevant sources of local POMC peptides.
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MESH Headings
- Adrenocorticotropic Hormone/pharmacology
- Animals
- Aorta/cytology
- Aorta/drug effects
- Aorta/metabolism
- Azo Compounds
- Calcium/metabolism
- Cells, Cultured
- Collagen/genetics
- Collagen/metabolism
- Extracellular Matrix/drug effects
- Fura-2
- Gene Expression/drug effects
- Macrophages/cytology
- Macrophages/drug effects
- Macrophages/metabolism
- Mesenchymal Stem Cells/cytology
- Mesenchymal Stem Cells/drug effects
- Mesenchymal Stem Cells/metabolism
- Mice
- Mice, Inbred C57BL
- Pro-Opiomelanocortin/genetics
- Pro-Opiomelanocortin/metabolism
- Proprotein Convertase 1/genetics
- Proprotein Convertase 1/metabolism
- Rats
- Rats, Inbred WKY
- Receptor, Melanocortin, Type 2/genetics
- Receptor, Melanocortin, Type 2/metabolism
- Receptor, Melanocortin, Type 3/genetics
- Receptor, Melanocortin, Type 3/metabolism
- Signal Transduction/drug effects
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Affiliation(s)
- Jodi F. Evans
- Biomedical Research Core, Winthrop University Hospital, 222 Station Plaza North, Mineola, NY 11501
- Stony Brook University School of Medicine, Stony Brook, NY 11794
| | - Anne Fernando
- Biomedical Research Core, Winthrop University Hospital, 222 Station Plaza North, Mineola, NY 11501
| | - Louis Ragolia
- Biomedical Research Core, Winthrop University Hospital, 222 Station Plaza North, Mineola, NY 11501
- Stony Brook University School of Medicine, Stony Brook, NY 11794
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Turan S, Hughes C, Atay Z, Guran T, Haliloglu B, Clark AJL, Bereket A, Metherell LA. An atypical case of familial glucocorticoid deficiency without pigmentation caused by coexistent homozygous mutations in MC2R (T152K) and MC1R (R160W). J Clin Endocrinol Metab 2012; 97:E771-4. [PMID: 22337906 PMCID: PMC3396854 DOI: 10.1210/jc.2011-2414] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
CONTEXT Familial glucocorticoid deficiency (FGD) is a rare autosomal recessive disorder characterized by isolated cortisol deficiency. Mutations in the gene encoding the ACTH receptor (MC2R) account for 25% of cases. One significant feature is generalized skin hyperpigmentation, which is thought to be due to elevated ACTH acting on the melanocortin 1 receptor (MC1R). OBJECTIVE The aim of the study was to determine the cause of a nonhyperpigmented case of FGD. PATIENTS The patient presented at 4 yr of age with hypoglycemia after prolonged fasting during a respiratory tract infection. She had further hypoglycemic attacks and was diagnosed with isolated glucocorticoid deficiency at 6 yr of age. Her parents were consanguineous, and she had two unaffected sisters. Her physical examination was normal, except that her height and weight were greater than the 97th centile for a sex- and age-matched reference population. Interestingly, she had no hyperpigmentation despite very high ACTH levels. RESULTS Nucleotide sequence analysis revealed homozygous mutations c.478C>T in MC1R and c.455C>A in MC2R leading to R160W and T152K changes in the amino acid sequences, respectively. The R160W MC1R change has previously been implicated in a red hair/pale skin phenotype, and MC2R -T152K is trafficking defective. Both parents and two unaffected sisters were heterozygous for the MC1R mutation; additionally, one unaffected sister was heterozygous for the MC2R mutation, and the other was wild-type. CONCLUSION We report an unusual case of FGD without hyperpigmentation due to coexistent MC1R/MC2R mutations. This case is important because it demonstrates for the first time that the assumption that the action of ACTH on MC1R causes skin hyperpigmentation is correct.
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Affiliation(s)
- Serap Turan
- Marmara University, Department of Pediatric Endocrinology, 34899 Istanbul, Turkey
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50
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Stratakis CA. "patients can have as many gene variants as they damn well please": why contemporary genetics presents us daily with a version of Hickam's dictum. J Clin Endocrinol Metab 2012; 97:E802-4. [PMID: 22563116 PMCID: PMC3339892 DOI: 10.1210/jc.2012-1650] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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