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Armour SL, Anderson SJ, Richardson SJ, Ding Y, Carey C, Lyon J, Maheshwari RR, Al-Jahdami N, Krasnogor N, Morgan NG, MacDonald P, Shaw JAM, White MG. Reduced Expression of the Co-regulator TLE1 in Type 2 Diabetes Is Associated with Increased Islet α-Cell Number. Endocrinology 2020; 161:5739548. [PMID: 32065829 DOI: 10.1210/endocr/bqaa011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Accepted: 01/28/2020] [Indexed: 12/11/2022]
Abstract
β-Cell dysfunction in type 2 diabetes (T2D) is associated with loss of cellular identity and mis-expression of alternative islet hormones, including glucagon. The molecular basis for these cellular changes has been attributed to dysregulation of core β-cell transcription factors, which regulate β-cell identity through activating and repressive mechanisms. The TLE1 gene lies near a T2D susceptibility locus and, recently, the glucagon repressive actions of this transcriptional coregulator have been demonstrated in vitro. We investigated whether TLE1 expression is disrupted in human T2D, and whether this is associated with increased islet glucagon-expressing cells. Automated image analysis following immunofluorescence in donors with (n = 7) and without (n = 7) T2D revealed that T2D was associated with higher islet α/β cell ratio (Control: 0.7 ± 0.1 vs T2D: 1.6 ± 0.4; P < .05) and an increased frequency of bihormonal (insulin+/glucagon+) cells (Control: 0.8 ± 0.2% vs T2D: 2.0 ± 0.4%, P < .05). In nondiabetic donors, the majority of TLE1-positive cells were mono-hormonal β-cells (insulin+/glucagon-: 98.2 ± 0.5%; insulin+/glucagon+: 0.7 ± 0.2%; insulin-/glucagon+: 1.1 ± 0.4%; P < .001). TLE1 expression was reduced in T2D (Control: 36 ± 2.9% vs T2D: 24 ± 2.6%; P < .05). Reduced islet TLE1 expression was inversely correlated with α/β cell ratio (r = -0.55; P < .05). TLE1 knockdown in EndoC-βH1 cells was associated with a 2.5-fold increase in glucagon gene mRNA and mis-expression of glucagon in insulin-positive cells. These data support TLE1 as a putative regulator of human β-cell identity, with dysregulated expression in T2D associated with increased glucagon expression potentially reflecting β- to α-cell conversion.
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Affiliation(s)
- Sarah L Armour
- Institute of Cellular Medicine, Diabetes Research Group, Newcastle University Medical School, Framlington Place, UK
| | - Scott J Anderson
- Institute of Cellular Medicine, Diabetes Research Group, Newcastle University Medical School, Framlington Place, UK
| | - Sarah J Richardson
- Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, Exeter, UK
| | - Yuchun Ding
- Interdisciplinary Computing and Complex Biosystems (ICOS) Research Group, School of Computing, Newcastle University, Newcastle Helix, UK
| | - Chris Carey
- Molecular Pathology Node Proximity Laboratory, Royal Victoria Infirmary, UK
| | - James Lyon
- Department of Pharmacology, Alberta Diabetes Institute, University of Alberta, Edmonton, AB, Canada
| | - Rashmi R Maheshwari
- Institute of Cellular Medicine, Diabetes Research Group, Newcastle University Medical School, Framlington Place, UK
| | - Najwa Al-Jahdami
- Institute of Cellular Medicine, Diabetes Research Group, Newcastle University Medical School, Framlington Place, UK
| | - Natalio Krasnogor
- Interdisciplinary Computing and Complex Biosystems (ICOS) Research Group, School of Computing, Newcastle University, Newcastle Helix, UK
| | - Noel G Morgan
- Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, Exeter, UK
| | - Patrick MacDonald
- Department of Pharmacology, Alberta Diabetes Institute, University of Alberta, Edmonton, AB, Canada
| | - James A M Shaw
- Institute of Cellular Medicine, Diabetes Research Group, Newcastle University Medical School, Framlington Place, UK
- Institute of Transplantation, Freeman Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne NE6 BXH, UK
| | - Michael G White
- Institute of Cellular Medicine, Diabetes Research Group, Newcastle University Medical School, Framlington Place, UK
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Cox B, Roose H, Vennekens A, Vankelecom H. Pituitary stem cell regulation: who is pulling the strings? J Endocrinol 2017; 234:R135-R158. [PMID: 28615294 DOI: 10.1530/joe-17-0083] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 06/14/2017] [Indexed: 12/28/2022]
Abstract
The pituitary gland plays a pivotal role in the endocrine system, steering fundamental processes of growth, metabolism, reproduction and coping with stress. The adult pituitary contains resident stem cells, which are highly quiescent in homeostatic conditions. However, the cells show marked signs of activation during processes of increased cell remodeling in the gland, including maturation at neonatal age, adaptation to physiological demands, regeneration upon injury and growth of local tumors. Although functions of pituitary stem cells are slowly but gradually uncovered, their regulation largely remains virgin territory. Since postnatal stem cells in general reiterate embryonic developmental pathways, attention is first being given to regulatory networks involved in pituitary embryogenesis. Here, we give an overview of the current knowledge on the NOTCH, WNT, epithelial-mesenchymal transition, SHH and Hippo pathways in the pituitary stem/progenitor cell compartment during various (activation) conditions from embryonic over neonatal to adult age. Most information comes from expression analyses of molecular components belonging to these networks, whereas functional extrapolation is still very limited. From this overview, it emerges that the 'big five' embryonic pathways are indeed reiterated in the stem cells of the 'lazy' homeostatic postnatal pituitary, further magnified en route to activation in more energetic, physiological and pathological remodeling conditions. Increasing the knowledge on the molecular players that pull the regulatory strings of the pituitary stem cells will not only provide further fundamental insight in postnatal pituitary homeostasis and activation, but also clues toward the development of regenerative ideas for improving treatment of pituitary deficiency and tumors.
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Affiliation(s)
- Benoit Cox
- Department of Development and RegenerationCluster of Stem Cell and Developmental Biology, Unit of Stem Cell Research, University of Leuven (KU Leuven), Leuven, Belgium
| | - Heleen Roose
- Department of Development and RegenerationCluster of Stem Cell and Developmental Biology, Unit of Stem Cell Research, University of Leuven (KU Leuven), Leuven, Belgium
| | - Annelies Vennekens
- Department of Development and RegenerationCluster of Stem Cell and Developmental Biology, Unit of Stem Cell Research, University of Leuven (KU Leuven), Leuven, Belgium
| | - Hugo Vankelecom
- Department of Development and RegenerationCluster of Stem Cell and Developmental Biology, Unit of Stem Cell Research, University of Leuven (KU Leuven), Leuven, Belgium
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Abstract
This article summarizes pituitary development and function as well as specific mutations of genes encoding the following transcription factors: HESX1, LHX3, LHX4, POU1F1, PROP1, and OTX2. Although several additional genetic defects related to hypopituitarism have been identified, this article focuses on these selected factors, as they have been well described in the literature in terms of clinical characterization of affected patients and molecular mechanisms of action, and therefore, are very relevant to clinical practice.
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Affiliation(s)
- Mariam Gangat
- Department of Pediatrics, Child Health Institute of New Jersey, Rutgers-Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, 89 French Street, Room 1360, New Brunswick, NJ 08901, USA.
| | - Sally Radovick
- Department of Pediatrics, Child Health Institute of New Jersey, Rutgers-Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, 89 French Street, Room 4212, New Brunswick, NJ 08901, USA
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4
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Pozzi S, Tan WH, Martinez-Barbera J. Characterization of a novel HESX1 mutation in a pediatric case of septo-optic dysplasia. Clin Case Rep 2017; 5:463-470. [PMID: 28396770 PMCID: PMC5378840 DOI: 10.1002/ccr3.868] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 08/13/2016] [Accepted: 01/29/2017] [Indexed: 11/08/2022] Open
Abstract
Septo‐optic dysplasia (SOD) is a rare condition for which the precise etiology is still unclear. Elucidating the genetic component of SOD is a difficult but necessary task for the future. We describe herein a novel HESX1 c.475C>T (p.R159W) mutation and demonstrate its potential pathogenicity in the development of this rare disease.
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Affiliation(s)
- Sara Pozzi
- Developmental Biology and Cancer Research Programme Birth Defects Research Centre UCL Great Ormond Street Institute of Child Health London UK
| | - Wen-Hann Tan
- Division of Genetics and Genomics Boston Children's Hospital Boston Massachusetts USA
| | - JuanPedro Martinez-Barbera
- Developmental Biology and Cancer Research Programme Birth Defects Research Centre UCL Great Ormond Street Institute of Child Health London UK
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Kapali J, Kabat BE, Schmidt KL, Stallings CE, Tippy M, Jung DO, Edwards BS, Nantie LB, Raeztman LT, Navratil AM, Ellsworth BS. Foxo1 Is Required for Normal Somatotrope Differentiation. Endocrinology 2016; 157:4351-4363. [PMID: 27631552 PMCID: PMC5086538 DOI: 10.1210/en.2016-1372] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The etiology for half of congenital hypopituitarism cases is unknown. Our long-term goal is to expand the molecular diagnoses for congenital hypopituitarism by identifying genes that contribute to this condition. We have previously shown that the forkhead box transcription factor, FOXO1, is present in approximately half of somatotropes at embryonic day (e) 18.5, suggesting it may have a role in somatotrope differentiation or function. To elucidate the role of FOXO1 in somatotrope differentiation and function, Foxo1 was conditionally deleted from the anterior pituitary (Foxo1Δpit). Uncommitted progenitor cells are maintained and able to commit to the somatotrope lineage normally based on the expression patterns of Sox2, a marker of uncommitted pituitary progenitors, and Pou1f1 (also known as Pit1), which marks committed progenitors. Interestingly, Foxo1Δpit embryonic mice exhibit delayed somatotrope differentiation as evidenced by an almost complete absence of GH immunoreactivity at e16.5 and reduced expression of Gh at e18.5 and postnatal day (P) 3. Consistent with this conclusion, expression of GHRH receptor, a marker of terminally differentiated somatotropes, is significantly reduced at e18.5 and P3 in the absence of FOXO1. The mechanism of FOXO1 regulation of somatotrope differentiation may involve the basic helix-loop-helix transcription factor, Neurod4, which has been implicated in somatotrope differentiation and is significantly reduced in Foxo1Δpit mice. Foxo1Δpit mice do not exhibit growth defects, and at P21 their pituitary glands exhibit a normal distribution of somatotropes. These studies demonstrate that FOXO1 is important for initial somatotrope specification embryonically but is dispensable for postnatal somatotrope expansion and growth.
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Affiliation(s)
- Jyoti Kapali
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Brock E Kabat
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Kelly L Schmidt
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Caitlin E Stallings
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Mason Tippy
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Deborah O Jung
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Brian S Edwards
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Leah B Nantie
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Lori T Raeztman
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Amy M Navratil
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Buffy S Ellsworth
- Department of Physiology (J.K., B.E.K., K.L.S., C.E.S., M.T., D.O.J., B.S.El.), Southern Illinois University, Carbondale, Illinois 62901-6523; Department of Zoology and Physiology (B.S.Ed., A.M.N.), University of Wyoming, Laramie, Wyoming 82071; and Department of Molecular and Integrative Physiology (L.B.N., L.T.R.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
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6
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Diri H, Sener E, Bayram F, Dundar M, Simsek Y, Baspinar O, Zararsiz G. GENETIC DISORDERS OF PITUITARY DEVELOPMENT IN PATIENTS WITH SHEEHAN'S SYNDROME. ACTA ENDOCRINOLOGICA (BUCHAREST, ROMANIA : 2005) 2016; 12:413-417. [PMID: 31149124 PMCID: PMC6535245 DOI: 10.4183/aeb.2016.413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
INTRODUCTION Genetic disorders associated with the development of the pituitary gland and cranial bones may cause a genetic tendency toward Sheehan's syndrome (SS). Our aim in this study was to investigate expression disorders in the genes responsible for the development of the pituitary gland and cranial bones in patients with SS. MATERIALS AND METHODS Forty-four patients who were previously diagnosed with SS and 43 healthy women were compared in terms of the mean expression values of genes including the prophet of PIT-1 (PROP1), HESX homeobox 1 (HESX1), POU class 1 homeobox 1 (POU1F1), LIM homeobox 3 (LHX3), LHX4, glioma-associated oncogene homolog 2 (GLI2), orthodenticle homeobox 2 (OTX2), SIX homeobox 3 (SIX3), SIX6, T-box transcription factor 19 (TBX19), transducin-like enhancer protein 1 (TLE1), TLE3, distal-less homeobox 2 (DLX2), DLX5, MSH homeobox 2 (MSX2), and paired box 3 (PAX3). RESULTS The mean expression values of the HESX1, TLE1, TLE3, and MSX2 genes were significantly different in the SS group from the healthy control group, while the mean expression values of the remaining genes were similar. CONCLUSION The present study concludes that abnormal expressions of HESX1, TLE1, TLE3, and MSX2 genes may cause a genetic predisposition to the development of SS.
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Affiliation(s)
- H. Diri
- Erciyes University Medical School, Division of Endocrinology, Kayseri, Turkey
| | - E.F. Sener
- Erciyes University Medical School, Dept. of Medical Biology, Kayseri, Turkey
| | - F. Bayram
- Erciyes University Medical School, Division of Endocrinology, Kayseri, Turkey
| | - M. Dundar
- Erciyes University Medical School, Dept. of Medical Genetics, Kayseri, Turkey
| | - Y. Simsek
- Erciyes University Medical School, Division of Endocrinology, Kayseri, Turkey
| | - O. Baspinar
- Erciyes University Medical School, Dept. of Internal Diseases, Kayseri, Turkey
| | - G. Zararsiz
- Erciyes University Medical School, Dept. of Biostatistics, Kayseri, Turkey
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Yang RW, Zeng YY, Wei WT, Cui YM, Sun HY, Cai YL, Nian XX, Hu YT, Quan YP, Jiang SL, Wang M, Zhao YL, Qiu JF, Li MX, Zhang JH, He MR, Liang L, Ding YQ, Liao WT. TLE3 represses colorectal cancer proliferation by inhibiting MAPK and AKT signaling pathways. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2016; 35:152. [PMID: 27669982 PMCID: PMC5037636 DOI: 10.1186/s13046-016-0426-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 09/13/2016] [Indexed: 01/19/2023]
Abstract
Background Transducin-like enhancer of Split3 (TLE3) serves as a transcriptional corepressor during cell differentiation and shows multiple roles in different kinds of cancers. Recently, TLE3 together with many other genes involved in Wnt/β-catenin pathway were detected hyper-methylated in colorectal cancer (CRC). However, the potential role and the underlying mechanism of TLE3 in CRC progression remain scarce. Methods Gene expression profiles were analyzed in The Cancer Genome Atlas (TCGA) microarray dataset of 41 normal colorectal intestine tissues and 465 CRC tissues. Western blot and Real-time Quantitative PCR (RT-qPCR) were respectively performed to detect protein and mRNA expression in 8 pairs of CRC tissue and matched adjacent normal mucosa. Immunohistochemistry (IHC) was conducted to evaluate TLE3 protein expression in 105 paraffin-embedded, archived human CRC tissues from patients, whose survival data were analyzed with Kaplan-Meier method. In vitro experiments including MTT assay, colony formation assay, and soft agar formation assay were used to investigate the effects of TLE3 on CRC cell growth and proliferation. Additionally, subcutaneous tumorigenesis assay was performed in nude mice to confirm the effects of TLE3 in vivo. Furthermore, gene set enrichment analysis (GSEA) was run to explore potential mechanism of TLE3 in CRC, and then we measured the distribution of CRC cell cycle phases and apoptosis by flow cytometry, as well as the impacts of TLE3 on MAPK and AKT signaling pathways by Western blot and RT-qPCR. Results TLE3 was significantly down-regulated in 465 CRC tissues compared with 41 normal tissues. Both protein and mRNA expressions of TLE3 were down-regulated in CRC compared with matched adjacent normal mucosa. Lower expression of TLE3 was significantly associated with poorer survival of patients with CRC. Besides, knock down of TLE3 promoted CRC cell growth and proliferation, while overexpression of TLE3 showed suppressive effects. Furthermore, overexpression of TLE3 caused G1-S phase transition arrest, inhibition of MAPK and AKT pathways, and up-regulation of p21Cip1/WAF1 and p27Kip1. Conclusion This study indicated that TLE3 repressed CRC proliferation partly through inhibition of MAPK and AKT signaling pathways, suggesting the possibility of TLE3 as a biomarker for CRC prognosis. Electronic supplementary material The online version of this article (doi:10.1186/s13046-016-0426-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Run-Wei Yang
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Ying-Yue Zeng
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Wen-Ting Wei
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Yan-Mei Cui
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Hui-Ying Sun
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Yue-Long Cai
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Xin-Xin Nian
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Yun-Teng Hu
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Yu-Ping Quan
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Sheng-Lu Jiang
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Meng Wang
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Ya-Li Zhao
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Jun-Feng Qiu
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Ming-Xuan Li
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Jia-Huan Zhang
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Mei-Rong He
- Guangdong Provincial Key Laboratory of Gastroenterology, Department of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Li Liang
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Yan-Qing Ding
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China. .,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China. .,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China. .,Department of Pathology, Nanfang Hospital and School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, Guangdong, China.
| | - Wen-Ting Liao
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China. .,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China. .,Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China. .,Department of Pathology, Nanfang Hospital and School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, Guangdong, China.
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8
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Stallings CE, Kapali J, Ellsworth BS. Mouse Models of Gonadotrope Development. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2016; 143:1-48. [PMID: 27697200 DOI: 10.1016/bs.pmbts.2016.08.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The pituitary gonadotrope is central to reproductive function. Gonadotropes develop in a systematic process dependent on signaling factors secreted from surrounding tissues and those produced within the pituitary gland itself. These signaling pathways are important for stimulating specific transcription factors that ultimately regulate the expression of genes and define gonadotrope identity. Proper gonadotrope development and ultimately gonadotrope function are essential for normal sexual maturation and fertility. Understanding the mechanisms governing differentiation programs of gonadotropes is important to improve treatment and molecular diagnoses for patients with gonadotrope abnormalities. Much of what is known about gonadotrope development has been elucidated from mouse models in which important factors contributing to gonadotrope development and function have been deleted, ectopically expressed, or modified. This chapter will focus on many of these mouse models and their contribution to our current understanding of gonadotrope development.
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Affiliation(s)
- C E Stallings
- Department of Physiology, School of Medicine, Southern Illinois University, Carbondale, IL, United States
| | - J Kapali
- Department of Physiology, School of Medicine, Southern Illinois University, Carbondale, IL, United States
| | - B S Ellsworth
- Department of Physiology, School of Medicine, Southern Illinois University, Carbondale, IL, United States.
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Fang Q, Figueredo Benedetti AF, Ma Q, Gregory L, Li JZ, Dattani M, Sadeghi-Nejad A, Arnhold IJ, de Mendonça BB, Camper SA, Carvalho LR. HESX1 mutations in patients with congenital hypopituitarism: variable phenotypes with the same genotype. Clin Endocrinol (Oxf) 2016; 85:408-14. [PMID: 27000987 PMCID: PMC4988903 DOI: 10.1111/cen.13067] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 02/22/2016] [Accepted: 03/16/2016] [Indexed: 02/01/2023]
Abstract
INTRODUCTION Mutations in the transcription factor HESX1 can cause isolated growth hormone deficiency (IGHD) or combined pituitary hormone deficiency (CPHD) with or without septo-optic dysplasia (SOD). So far there is no clear genotype-phenotype correlation. PATIENTS AND RESULTS We report four different recessive loss-of-function mutations in three unrelated families with CPHD and no midline defects or SOD. A homozygous p.R160C mutation was found by Sanger sequencing in two siblings from a consanguineous family. These patients presented with ACTH, TSH and GH deficiencies, severe anterior pituitary hypoplasia (APH) or pituitary aplasia (PA) and normal posterior pituitary. The p.R160C mutation was previously reported in a case with SOD, CPHD and ectopic posterior pituitary (EPP). Using exome sequencing, a homozygous p.I26T mutation was found in a Brazilian patient born to consanguineous parents. This patient had evolving CPHD, normal ACTH, APH and normal posterior pituitary (NPP). A previously reported patient homozygous for p.I26T had evolving CPHD and EPP. Finally, we identified compound heterozygous mutations in HESX1, p.[R159W];[R160H], in a patient with PA and CPHD. We showed that both of these mutations abrogate the ability of HESX1 to repress PROP1-mediated transcriptional activation. A patient homozygous for p.R160H was previously reported in a patient with CPHD, EPP, APH. CONCLUSION These three examples demonstrate that HESX1 mutations cause variable clinical features in patients, which suggests an influence of modifier genes or environmental factors on the phenotype.
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Affiliation(s)
- Qing Fang
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Anna Flavia Figueredo Benedetti
- Division of Endocrinology, Unit of Endocrinology and Development, Laboratory of Hormones and Molecular Genetics, Clinical Hospital of the Faculty of Medicine of the University of São Paulo, São Paulo, Brazil
| | - Qianyi Ma
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Louise Gregory
- Developmental Endocrinology Research Group, Section of Genetics and Epigenetics in Health and Disease, Genetics and Genomic Medicine Programme, University College London, Institute of Child Health, London, UK
| | - Jun Z. Li
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Mehul Dattani
- Developmental Endocrinology Research Group, Section of Genetics and Epigenetics in Health and Disease, Genetics and Genomic Medicine Programme, University College London, Institute of Child Health, London, UK
| | - Abdollah Sadeghi-Nejad
- Division of Pediatric Endocrinology, Floating Hospital for Children at Tufts Medical Center, Tufts University School of Medicine, Boston, MA, USA
| | - Ivo J.P. Arnhold
- Division of Endocrinology, Unit of Endocrinology and Development, Laboratory of Hormones and Molecular Genetics, Clinical Hospital of the Faculty of Medicine of the University of São Paulo, São Paulo, Brazil
| | - Berenice Bilharinho de Mendonça
- Division of Endocrinology, Unit of Endocrinology and Development, Laboratory of Hormones and Molecular Genetics, Clinical Hospital of the Faculty of Medicine of the University of São Paulo, São Paulo, Brazil
| | - Sally A. Camper
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI, USA
- Correspondence should be addressed to: Sally A. Camper, Ph.D., Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI 48109-5618, USA, Fax: 1-734-763-3784, , Luciani R. Carvalho, M.D., Ph.D., Endocrinology Discipline of Internal Medicine Department, University of Sao Paulo Medical School, Sao Paulo, Brazil, Fax: 55-11-2661-7519,
| | - Luciani R. Carvalho
- Division of Endocrinology, Unit of Endocrinology and Development, Laboratory of Hormones and Molecular Genetics, Clinical Hospital of the Faculty of Medicine of the University of São Paulo, São Paulo, Brazil
- Correspondence should be addressed to: Sally A. Camper, Ph.D., Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI 48109-5618, USA, Fax: 1-734-763-3784, , Luciani R. Carvalho, M.D., Ph.D., Endocrinology Discipline of Internal Medicine Department, University of Sao Paulo Medical School, Sao Paulo, Brazil, Fax: 55-11-2661-7519,
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10
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Agarwal M, Kumar P, Mathew SJ. The Groucho/Transducin-like enhancer of split protein family in animal development. IUBMB Life 2015; 67:472-81. [PMID: 26172616 DOI: 10.1002/iub.1395] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 06/15/2015] [Indexed: 01/30/2023]
Abstract
Corepressors are proteins that cannot bind DNA directly but repress transcription by interacting with partner proteins. The Groucho/Transducin-Like Enhancer of Split (TLE) are a conserved family of corepressor proteins present in animals ranging from invertebrates such as Drosophila to vertebrates such as mice and humans. Groucho/TLE proteins perform important functions throughout the life span of animals, interacting with several pathways and regulating fundamental processes such as metabolism. However, these proteins have especially crucial functions in animal development, where they are required in multiple tissues in a temporally regulated manner. In this review, we summarize the functions of the Groucho/TLE proteins during animal development, emphasizing on specific tissues where they play essential roles.
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Affiliation(s)
- Megha Agarwal
- Regional Centre for Biotechnology, NCR Bio-Science Cluster, Faridabad, Haryana, India
| | - Pankaj Kumar
- Regional Centre for Biotechnology, NCR Bio-Science Cluster, Faridabad, Haryana, India
| | - Sam J Mathew
- Regional Centre for Biotechnology, NCR Bio-Science Cluster, Faridabad, Haryana, India
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11
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Xie H, Hoffmann HM, Meadows JD, Mayo SL, Trang C, Leming SS, Maruggi C, Davis SW, Larder R, Mellon PL. Homeodomain Proteins SIX3 and SIX6 Regulate Gonadotrope-specific Genes During Pituitary Development. Mol Endocrinol 2015; 29:842-55. [PMID: 25915183 PMCID: PMC4447639 DOI: 10.1210/me.2014-1279] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 04/20/2015] [Indexed: 12/15/2022] Open
Abstract
Sine oculis-related homeobox 3 (SIX3) and SIX6, 2 closely related homeodomain transcription factors, are involved in development of the mammalian neuroendocrine system and mutations of Six6 adversely affect fertility in mice. We show that both small interfering RNA knockdown in gonadotrope cell lines and knockout of Six6 in both embryonic and adult male mice (Six6 knockout) support roles for SIX3 and SIX6 in transcriptional regulation in gonadotrope gene expression and that SIX3 and SIX6 can functionally compensate for each other. Six3 and Six6 expression patterns in gonadotrope cell lines reflect the timing of the expression of pituitary markers they regulate. Six3 is expressed in an immature gonadotrope cell line and represses transcription of the early lineage-specific pituitary genes, GnRH receptor (GnRHR) and the common α-subunit (Cga), whereas Six6 is expressed in a mature gonadotrope cell line and represses the specific β-subunits of LH and FSH (LHb and FSHb) that are expressed later in development. We show that SIX6 repression requires interaction with transducin-like enhancer of split corepressor proteins and competition for DNA-binding sites with the transcriptional activator pituitary homeobox 1. Our studies also suggest that estradiol and circadian rhythm regulate pituitary expression of Six6 and Six3 in adult females but not in males. In summary, SIX3 and SIX6 play distinct but compensatory roles in regulating transcription of gonadotrope-specific genes as gonadotrope cells differentiate.
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Affiliation(s)
- Huimin Xie
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
| | - Hanne M Hoffmann
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
| | - Jason D Meadows
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
| | - Susan L Mayo
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
| | - Crystal Trang
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
| | - Sunamita S Leming
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
| | - Chiara Maruggi
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
| | - Shannon W Davis
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
| | - Rachel Larder
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
| | - Pamela L Mellon
- Department of Reproductive Medicine and the Center for Reproductive Science and Medicine (H.X., H.M.H., J.D.M., S.L.M., C.T., S.S.L., C.M., R.L., P.L.M.), University of California, San Diego, La Jolla, California 92093; and Department of Human Genetics (S.W.D.), University of Michigan, Ann Arbor, Michigan 48109
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12
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Abstract
Significant progress has been made recently in unravelling the embryonic events leading to pituitary morphogenesis, both in vivo and in vitro. This includes dissection of the molecular mechanisms controlling patterning of the ventral diencephalon that regulate formation of the pituitary anlagen or Rathke's pouch. There is also a better characterisation of processes that underlie maintenance of pituitary progenitors, specification of endocrine lineages and the three-dimensional organisation of newly differentiated endocrine cells. Furthermore, a population of adult pituitary stem cells (SCs), originating from embryonic progenitors, have been described and shown to have not only regenerative potential, but also the capacity to induce tumour formation. Finally, the successful recapitulation in vitro of embryonic events leading to generation of endocrine cells from embryonic SCs, and their subsequent transplantation, represents exciting advances towards the use of regenerative medicine to treat endocrine deficits. In this review, an up-to-date description of pituitary morphogenesis will be provided and discussed with particular reference to pituitary SC studies.
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Affiliation(s)
- Karine Rizzoti
- Division of Stem Cell Biology and Developmental GeneticsMRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK
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13
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McCabe MJ, Dattani MT. Genetic aspects of hypothalamic and pituitary gland development. HANDBOOK OF CLINICAL NEUROLOGY 2014; 124:3-15. [DOI: 10.1016/b978-0-444-59602-4.00001-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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14
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Sugiyama Y, Ikeshita N, Shibahara H, Yamamoto D, Kawagishi M, Iguchi G, Iida K, Takahashi Y, Kaji H, Chihara K, Okimura Y. A PROP1-binding factor, AES cloned by yeast two-hybrid assay represses PROP1-induced Pit-1 gene expression. Mol Cell Endocrinol 2013; 376:93-8. [PMID: 23732115 DOI: 10.1016/j.mce.2013.05.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2012] [Revised: 04/22/2013] [Accepted: 05/28/2013] [Indexed: 10/26/2022]
Abstract
PROP1 mutation causes combined pituitary hormone deficiency (CPHD). Several mutations are located in a transactivation domain (TAD) of Prop1, and the loss of TAD binding to cofactors is likely the cause of CPHD. PROP1 cofactors have not yet been identified. In the present study, we aimed to identify the PROP1-interacting proteins from the human brain cDNA library. Using a yeast two-hybrid assay, we cloned nine candidate proteins that may bind to PROP1. Of those nine candidates, amino-terminal enhancer of split (AES) was the most abundant, and we analyzed the AES function. AES dose-dependently decreased the PROP1-induced Pit-1 reporter gene expression. An immunoprecipitation assay revealed the relationship between AES and PROP1. In a mammalian two-hybrid assay, a leucine zipper-like motif of the AES Q domain was identified as a region that interacted with TAD. These results indicated that AES was a corepressor of PROP1.
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Affiliation(s)
- Yuka Sugiyama
- Department of Biophysics, Kobe University Graduate School of Health Science, 7-10-2, Tomogaoka, Suma-ku, Kobe 654-0142, Japan
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15
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Arkell RM, Fossat N, Tam PPL. Wnt signalling in mouse gastrulation and anterior development: new players in the pathway and signal output. Curr Opin Genet Dev 2013; 23:454-60. [PMID: 23608663 DOI: 10.1016/j.gde.2013.03.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 03/06/2013] [Accepted: 03/08/2013] [Indexed: 12/20/2022]
Abstract
Embryonic development and adult homeostasis are dependent upon the coordinated action of signal transduction pathways such as the Wnt signalling pathway which is used iteratively during these processes. In the early post-implantation mouse embryo, Wnt/β-catenin signalling activity plays a critical role in the formation of the primitive streak, progression of gastrulation and tissue patterning in the anterior-posterior axis. The net output of the signalling pathway is influenced by the delivery and post-translational modification of the ligands, the counteracting activities of the activating components and the negative modulators, and the molecular interaction of β-catenin, TCF and other factors regulating the transcription of downstream target genes.
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Affiliation(s)
- Ruth M Arkell
- Early Mammalian Development Laboratory, Research School of Biology, College of Medicine, Biology and Environment, Australian National University, Canberra, ACT, Australia.
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16
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Xie H, Cherrington BD, Meadows JD, Witham EA, Mellon PL. Msx1 homeodomain protein represses the αGSU and GnRH receptor genes during gonadotrope development. Mol Endocrinol 2013; 27:422-36. [PMID: 23371388 DOI: 10.1210/me.2012-1289] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Multiple homeodomain transcription factors are crucial for pituitary organogenesis and cellular differentiation. A homeodomain repressor, Msx1, is expressed from the ventral aspect of the developing anterior pituitary and implicated in gonadotrope differentiation. Here, we find that Msx1 represses transcription of lineage-specific pituitary genes such as the common α-glycoprotein subunit (αGSU) and GnRH receptor (GnRHR) promoters in the mouse gonadotrope-derived cell lines, αT3-1 and LβT2. Repression of the mouse GnRHR promoter by Msx1 is mediated through a consensus-binding motif in the downstream activin regulatory element (DARE). Truncation and mutation analyses of the human αGSU promoter map Msx1 repression to a site at -114, located at the junctional regulatory element (JRE). Dlx activators are closely related to the Msx repressors, acting through the same elements, and Dlx3 and Dlx2 act as transcriptional activators for GnRHR and αGSU, respectively. Small interfering RNA knockdown of Msx1 in αT3-1 cells increases endogenous αGSU and GnRHR mRNA expression. Msx1 gene expression reaches its maximal expression at the rostral edge at e13.5. The subsequent decline in Msx1 expression specifically coincides with the onset of expression of both αGSU and GnRHR. The expression levels of both αGSU and GnRHR in Msx1-null mice at e18.5 are higher compared with wild type, further confirming a role for Msx1 in the repression of αGSU and GnRHR. In summary, Msx1 functions as a negative regulator early in pituitary development by repressing the gonadotrope-specific αGSU and GnRHR genes, but a temporal decline in Msx1 expression alleviates this repression allowing induction of GnRHR and αGSU, thus serving to time the onset of gonadotrope-specific gene program.
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Affiliation(s)
- Huimin Xie
- Department of Reproductive Medicine, Center for Reproductive Science and Medicine, University of California San Diego, La Jolla, CA 92093-0674, USA
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Abstract
Estrogen receptor (ER) is a hormone-regulated transcription factor that controls cell division and differentiation in the ovary, breast, and uterus. The expression of ER is a common feature of the majority of breast cancers, which is used as a therapeutic target. Recent genetic studies have shown that ER binding occurs in regions distant to the promoters of estrogen target genes. These studies have also demonstrated that ER binding is accompanied with the binding of other transcription factors, which regulate the function of ER and response to anti-estrogen therapies. In this review, we explain how these factors influence the interaction of ER to chromatin and their cooperation for ER transcriptional activity. Moreover, we describe how the expression of these factors dictates the response to anti-estrogen therapies. Finally, we discuss how cytoplasmatic signaling pathways may modulate the function of ER and its cooperating transcription factors.
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Tsai-Morris CH, Sato H, Gutti R, Dufau ML. Role of gonadotropin regulated testicular RNA helicase (GRTH/Ddx25) on polysomal associated mRNAs in mouse testis. PLoS One 2012; 7:e32470. [PMID: 22479328 PMCID: PMC3316541 DOI: 10.1371/journal.pone.0032470] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Accepted: 01/31/2012] [Indexed: 01/06/2023] Open
Abstract
Gonadotropin Regulated Testicular RNA Helicase (GRTH/Ddx25) is a testis-specific multifunctional RNA helicase and an essential post-transcriptional regulator of spermatogenesis. GRTH transports relevant mRNAs from nucleus to cytoplasmic sites of meiotic and haploid germ cells and associates with actively translating polyribosomes. It is also a negative regulator of steroidogenesis in Leydig cells. To obtain a genome-wide perspective of GRTH regulated genes, in particularly those associated with polyribosomes, microarray differential gene expression analysis was performed using polysome-bound RNA isolated from testes of wild type (WT) and GRTH KO mice. 792 genes among the entire mouse genome were found to be polysomal GRTH-linked in WT. Among these 186 were down-regulated and 7 up-regulated genes in GRTH null mice. A similar analysis was performed using total RNA extracted from purified germ cell populations to address GRTH action in individual target cells. The down-regulation of known genes concerned with spermatogenesis at polysomal sites in GRTH KO and their association with GRTH in WT coupled with early findings of minor or unchanged total mRNAs and abolition of their protein expression in KO underscore the relevance of GRTH in translation. Ingenuity pathway analysis predicted association of GRTH bound polysome genes with the ubiquitin-proteasome-heat shock protein signaling network pathway and NFκB/TP53/TGFB1 signaling networks were derived from the differentially expressed gene analysis. This study has revealed known and unexplored factors in the genome and regulatory pathways underlying GRTH action in male reproduction.
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Affiliation(s)
- Chon-Hwa Tsai-Morris
- Section on Molecular Endocrinology, Program in Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America.
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19
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Andoniadou CL, Signore M, Young RM, Gaston-Massuet C, Wilson SW, Fuchs E, Martinez-Barbera JP. HESX1- and TCF3-mediated repression of Wnt/β-catenin targets is required for normal development of the anterior forebrain. Development 2011; 138:4931-42. [PMID: 22007134 DOI: 10.1242/dev.066597] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The Wnt/β-catenin pathway plays an essential role during regionalisation of the vertebrate neural plate and its inhibition in the most anterior neural ectoderm is required for normal forebrain development. Hesx1 is a conserved vertebrate-specific transcription factor that is required for forebrain development in Xenopus, mice and humans. Mouse embryos deficient for Hesx1 exhibit a variable degree of forebrain defects, but the molecular mechanisms underlying these defects are not fully understood. Here, we show that injection of a hesx1 morpholino into a 'sensitised' zygotic headless (tcf3) mutant background leads to severe forebrain and eye defects, suggesting an interaction between Hesx1 and the Wnt pathway during zebrafish forebrain development. Consistent with a requirement for Wnt signalling repression, we highlight a synergistic gene dosage-dependent interaction between Hesx1 and Tcf3, a transcriptional repressor of Wnt target genes, to maintain anterior forebrain identity during mouse embryogenesis. In addition, we reveal that Tcf3 is essential within the neural ectoderm to maintain anterior character and that its interaction with Hesx1 ensures the repression of Wnt targets in the developing forebrain. By employing a conditional loss-of-function approach in mouse, we demonstrate that deletion of β-catenin, and concomitant reduction of Wnt signalling in the developing anterior forebrain of Hesx1-deficient embryos, leads to a significant rescue of the forebrain defects. Finally, transcriptional profiling of anterior forebrain precursors from mouse embryos expressing eGFP from the Hesx1 locus provides molecular evidence supporting a novel function of Hesx1 in mediating repression of Wnt/β-catenin target activation in the developing forebrain.
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Affiliation(s)
- Cynthia L Andoniadou
- Neural Development Unit, UCL Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
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Beta-catenin stimulates pituitary stem cells to form aggressive tumors. Proc Natl Acad Sci U S A 2011; 108:11303-4. [PMID: 21719710 DOI: 10.1073/pnas.1108275108] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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McCabe MJ, Alatzoglou KS, Dattani MT. Septo-optic dysplasia and other midline defects: the role of transcription factors: HESX1 and beyond. Best Pract Res Clin Endocrinol Metab 2011; 25:115-24. [PMID: 21396578 DOI: 10.1016/j.beem.2010.06.008] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Septo-optic dysplasia (SOD) is a highly heterogeneous condition comprising variable phenotypes including midline and forebrain abnormalities, optic nerve and pituitary hypoplasia. Most instances of SOD are sporadic and several aetiologies including drug and alcohol abuse have been suggested to account for the pathogenesis of the condition. However, a number of familial cases have been described with an increasing number of mutations in developmental transcription factors including HESX1, SOX2, SOX3 and OTX2 being implicated in its aetiology. These factors are essential for normal forebrain/pituitary development, and disruptions to these genes could account for the features observed in SOD and other midline disorders. The variable phenotypes observed within the condition are most likely due to the varying contributions of genetic and environmental factors. This review will discuss the current knowledge about SOD. Further study of these and other novel factors may shed light on the complex aetiology of this condition.
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Affiliation(s)
- Mark James McCabe
- Developmental Endocrinology Research Group, Clinical and Molecular Genetics Unit, UCL Institute of Child Health, University College London, 30 Guilford Street, London, UK.
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