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Ge J, Li H, Liang X, Zhou B. SLC30A9: an evolutionarily conserved mitochondrial zinc transporter essential for mammalian early embryonic development. Cell Mol Life Sci 2024; 81:357. [PMID: 39158587 PMCID: PMC11335279 DOI: 10.1007/s00018-024-05377-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 06/23/2024] [Accepted: 07/22/2024] [Indexed: 08/20/2024]
Abstract
SLC30A9 (ZnT9) is a mitochondria-resident zinc transporter. Mutations in SLC30A9 have been reported in human patients with a novel cerebro-renal syndrome. Here, we show that ZnT9 is an evolutionarily highly conserved protein, with many regions extremely preserved among evolutionarily distant organisms. In Drosophila melanogaster (the fly), ZnT9 (ZnT49B) knockdown results in acutely impaired movement and drastic mitochondrial deformation. Severe Drosophila ZnT9 (dZnT9) reduction and ZnT9-null mutant flies are pupal lethal. The phenotype of dZnT9 knockdown can be partially rescued by mouse ZnT9 expression or zinc chelator TPEN, indicating the defect of dZnT9 loss is indeed a result of zinc dyshomeostasis. Interestingly, in the mouse, germline loss of Znt9 produces even more extreme phenotypes: the mutant embryos exhibit midgestational lethality with severe development abnormalities. Targeted mutagenesis of Znt9 in the mouse brain leads to serious dwarfism and physical incapacitation, followed by death shortly. Strikingly, the GH/IGF-1 signals are almost non-existent in these tissue-specific knockout mice, consistent with the medical finding in some human patients with severe mitochondrial deficiecny. ZnT9 mutations cause mitochondrial zinc dyshomeostasis, and we demonstrate mechanistically that mitochondrial zinc elevation quickly and potently inhibits the activities of respiration complexes. These results reveal the critical role of ZnT9 and mitochondrial zinc homeostasis in mammalian development. Based on our functional analyses, we finally discussed the possible nature of the so far identified human SLC30A9 mutations.
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Affiliation(s)
- Jing Ge
- School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Huihui Li
- Shenzhen Key Laboratory of Synthetic Genomics, Guangdong Provincial Key Laboratory of Synthetic Genomics, Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China
| | - Xin Liang
- School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Bing Zhou
- Shenzhen Key Laboratory of Synthetic Genomics, Guangdong Provincial Key Laboratory of Synthetic Genomics, Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.
- Faculty of Synthetic Biology, Shenzhen University of Advanced Technology, Shenzhen, 518055, China.
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2
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Duvick L, Southern WM, Benzow KA, Burch ZN, Handler HP, Mitchell JS, Kuivinen H, Gadiparthi U, Yang P, Soles A, Sheeler CA, Rainwater O, Serres S, Lind EB, Nichols-Meade T, You Y, O’Callaghan B, Zoghbi HY, Cvetanovic M, Wheeler VC, Ervasti JM, Koob MD, Orr HT. Mapping SCA1 regional vulnerabilities reveals neural and skeletal muscle contributions to disease. JCI Insight 2024; 9:e176057. [PMID: 38512434 PMCID: PMC11141930 DOI: 10.1172/jci.insight.176057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 03/19/2024] [Indexed: 03/23/2024] Open
Abstract
Spinocerebellar ataxia type 1 (SCA1) is a fatal neurodegenerative disease caused by an expanded polyglutamine tract in the widely expressed ataxin-1 (ATXN1) protein. To elucidate anatomical regions and cell types that underlie mutant ATXN1-induced disease phenotypes, we developed a floxed conditional knockin mouse (f-ATXN1146Q/2Q) with mouse Atxn1 coding exons replaced by human ATXN1 exons encoding 146 glutamines. f-ATXN1146Q/2Q mice manifested SCA1-like phenotypes including motor and cognitive deficits, wasting, and decreased survival. Central nervous system (CNS) contributions to disease were revealed using f-ATXN1146Q/2Q;Nestin-Cre mice, which showed improved rotarod, open field, and Barnes maze performance by 6-12 weeks of age. In contrast, striatal contributions to motor deficits using f-ATXN1146Q/2Q;Rgs9-Cre mice revealed that mice lacking ATXN1146Q/2Q in striatal medium-spiny neurons showed a trending improvement in rotarod performance at 30 weeks of age. Surprisingly, a prominent role for muscle contributions to disease was revealed in f-ATXN1146Q/2Q;ACTA1-Cre mice based on their recovery from kyphosis and absence of muscle pathology. Collectively, data from the targeted conditional deletion of the expanded allele demonstrated CNS and peripheral contributions to disease and highlighted the need to consider muscle in addition to the brain for optimal SCA1 therapeutics.
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Affiliation(s)
- Lisa Duvick
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - W. Michael Southern
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, Minnesota, USA
| | - Kellie A. Benzow
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Zoe N. Burch
- Molecular Neurogenetics Unit, Center for Genomic Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Hillary P. Handler
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Jason S. Mitchell
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Hannah Kuivinen
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Udaya Gadiparthi
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Praseuth Yang
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Alyssa Soles
- Institute of Translational Neuroscience
- Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota, USA
| | - Carrie A. Sheeler
- Institute of Translational Neuroscience
- Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota, USA
| | - Orion Rainwater
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Shannah Serres
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Erin B. Lind
- Institute of Translational Neuroscience
- Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota, USA
| | - Tessa Nichols-Meade
- Institute of Translational Neuroscience
- Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota, USA
| | - Yun You
- Mouse Genetics Laboratory, University of Minnesota, Minneapolis. Minnesota, USA
| | - Brennon O’Callaghan
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Huda Y. Zoghbi
- Departments of Molecular and Human Genetics, Pediatrics, and Howard Hughes Medical Institute, Baylor College of Medicine, Jan and Dan Duncan Neurological Research Institute at Texas Children’s Hospital, Houston, Texas, USA
| | - Marija Cvetanovic
- Institute of Translational Neuroscience
- Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota, USA
| | - Vanessa C. Wheeler
- Molecular Neurogenetics Unit, Center for Genomic Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Neurology, Harvard Medical School, Boston, Massachusetts, USA
| | - James M. Ervasti
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, Minnesota, USA
| | - Michael D. Koob
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
| | - Harry T. Orr
- Institute of Translational Neuroscience
- Department of Laboratory Medicine and Pathology, and
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3
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Swilley C, Lin Y, Zheng Y, Xu X, Liu M, Zimmerman K, Xie H. Sex-Linked Growth Disorder and Aberrant Pituitary Gene Expression in Nestin-Cre-Mediated Egr1 Conditional Knockout Mice. BIOLOGY 2023; 12:966. [PMID: 37508396 PMCID: PMC10376842 DOI: 10.3390/biology12070966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 06/22/2023] [Accepted: 06/30/2023] [Indexed: 07/30/2023]
Abstract
Genes that regulate hormone release are essential for maintaining metabolism and energy balance. Egr1 encodes a transcription factor that regulates hormone production and release, and a decreased in growth hormones has been reported in Egr1 knockout mice. A reduction in growth hormones has also been observed in Nestin-Cre mice, a model frequently used to study the nervous system. Currently, it is unknown how Egr1 loss or the Nestin-Cre driver disrupt pituitary gene expression. Here, we compared the growth curves and pituitary gene expression profiles of Nestin-Cre-mediated Egr1 conditional knockout (Egr1cKO) mice with those of their controls. Reduced body weight was observed in both the Nestin-Cre and Egr1cKO mice, and the loss of Egr1 had a slightly more severe impact on female mice than on male mice. RNA-seq data analyses revealed that the sex-related differences were amplified in the Nestin-Cre-mediated Egr1 conditional knockout mice. Additionally, in the male mice, the influence of Egr1cKO on pituitary gene expression may be overridden by the Nestin-Cre driver. Differentially expressed genes associated with the Nestin-Cre driver were significantly enriched for genes related to growth factor activity and binding. Altogether, our results demonstrate that Nestin-Cre and the loss of Egr1 in the neuronal cell lineage have distinct impacts on pituitary gene expression in a sex-specific manner.
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Affiliation(s)
- Cody Swilley
- Epigenomics and Computational Biology Lab, Fralin Life Sciences Institute of Virginia Tech, Blacksburg, VA 24061, USA
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061, USA
| | - Yu Lin
- Epigenomics and Computational Biology Lab, Fralin Life Sciences Institute of Virginia Tech, Blacksburg, VA 24061, USA
- Genetics, Bioinformatics and Computational Biology Program, Virginia Tech, Blacksburg, VA 24061, USA
| | - Yuze Zheng
- Epigenomics and Computational Biology Lab, Fralin Life Sciences Institute of Virginia Tech, Blacksburg, VA 24061, USA
| | - Xiguang Xu
- Epigenomics and Computational Biology Lab, Fralin Life Sciences Institute of Virginia Tech, Blacksburg, VA 24061, USA
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061, USA
| | - Min Liu
- Epigenomics and Computational Biology Lab, Fralin Life Sciences Institute of Virginia Tech, Blacksburg, VA 24061, USA
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061, USA
| | - Kurt Zimmerman
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061, USA
| | - Hehuang Xie
- Epigenomics and Computational Biology Lab, Fralin Life Sciences Institute of Virginia Tech, Blacksburg, VA 24061, USA
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061, USA
- Genetics, Bioinformatics and Computational Biology Program, Virginia Tech, Blacksburg, VA 24061, USA
- Translational Biology, Medicine and Health Program, Virginia Tech, Blacksburg, VA 24061, USA
- School of Neuroscience, Virginia Tech, Blacksburg, VA 24061, USA
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4
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Baghdadi M, Mesaros A, Purrio M, Partridge L. Sex-specific effects of Cre expression in Syn1Cre mice. Sci Rep 2023; 13:10037. [PMID: 37340054 DOI: 10.1038/s41598-023-37029-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 06/14/2023] [Indexed: 06/22/2023] Open
Abstract
The Cre-loxP system has been used to generate cell-type specific mutations in mice, allowing researchers to investigate the underlying biological mechanisms of disease. However, the Cre-recombinase alone can induce phenotypes that confound comparisons among genotypes if the appropriate Cre control is not included. In this study, we characterised behavioural, morphological and metabolic phenotypes of the pan-neuronal Syn1Cre line. We found that these mice possess intact neuromuscular parameters but have reduced exploratory activity and a male-specific increase in anxiety-like behaviour. Moreover, we observed a male-specific deficit in learning and long-term memory of Syn1Cre mice that could be a result of decreased visual acuity. Furthermore, we found that over-expression of human growth hormone (hGH) from Syn1Cre results in a male-specific reduction in body weight and femur length, potentially through decreased hepatic Igf1 expression. However, metabolic characteristics of Syn1Cre mice such as glucose metabolism, energy expenditure and feeding were unaffected by the presence of Syn1Cre. In conclusion, our data demonstrate that Syn1Cre expression has effects on behavioural and morphological traits. This finding highlights the importance of including the Cre control in all comparisons, while the male-specific effects on some phenotypes highlight the importance of including both sexes.
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Affiliation(s)
| | - Andrea Mesaros
- Max-Planck Institute for Biology of Ageing, Cologne, Germany
| | - Martin Purrio
- Max-Planck Institute for Biology of Ageing, Cologne, Germany
| | - Linda Partridge
- Max-Planck Institute for Biology of Ageing, Cologne, Germany.
- Institute of Healthy Ageing, and GEE, UCL, London, UK.
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5
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Wasinski F, Tavares MR, Gusmao DO, List EO, Kopchick JJ, Alves GA, Frazao R, Donato J. Central growth hormone action regulates neuroglial and proinflammatory markers in the hypothalamus of male mice. Neurosci Lett 2023; 806:137236. [PMID: 37030549 PMCID: PMC10133206 DOI: 10.1016/j.neulet.2023.137236] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 04/03/2023] [Accepted: 04/04/2023] [Indexed: 04/10/2023]
Abstract
Growth hormone (GH) action in specific neuronal populations regulates neuroendocrine responses, metabolism, and behavior. However, the potential role of central GH action on glial function is less understood. The present study aims to determine how the hypothalamic expression of several neuroglial markers is affected by central GH action in male mice. The dwarf GH- and insulin-like growth factor-1 (IGF-1)-deficient Ghrhrlit/lit mice showed decreased mRNA expression of Nes (Nestin), Gfap, Iba1, Adgre1 (F4/80), and Tnf (TNFα) in the hypothalamus, compared to wild-type animals. In contrast, transgenic overexpression of GH led to high serum GH and IGF-1 levels, and increased hypothalamic expression of Nes, Gfap, Adgre1, Iba1, and Rax. Hepatocyte-specific GH receptor (GHR) knockout mice, which are characterized by high serum GH levels, but reduced IGF-1 secretion, showed increased mRNA expression of Gfap, Iba1, Tnf, and Sox10, demonstrating that the increase in GH levels alters the hypothalamic expression of glial markers associated with neuroinflammation, independently of IGF-1. Conversely, brain-specific GHR knockout mice showed reduced expression of Gfap, Adgre1, and Vim (vimentin), indicating that brain GHR signaling is necessary to mediate GH-induced changes in the expression of several neuroglial markers. In conclusion, the hypothalamic mRNA levels of several neuroglial markers associated with inflammation are directly modulated by GHR signaling in male mice.
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Affiliation(s)
- Frederick Wasinski
- Department of Neurology and Neurosurgery, Universidade Federal de Sao Paulo, Sao Paulo, SP 04039-032, Brazil
| | - Mariana R Tavares
- Department of Physiology and Biophysics, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-000, Brazil
| | - Daniela O Gusmao
- Department of Physiology and Biophysics, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-000, Brazil
| | - Edward O List
- Edison Biotechnology Institute and Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - John J Kopchick
- Edison Biotechnology Institute and Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - Guilherme A Alves
- Department of Anatomy, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-900, Brazil
| | - Renata Frazao
- Department of Anatomy, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-900, Brazil
| | - Jose Donato
- Department of Physiology and Biophysics, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-000, Brazil.
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6
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Alia AO, Jeon S, Popovic J, Salvo MA, Sadleir KR, Vassar R, Cuddy LK. Aberrant glial activation and synaptic defects in CaMKIIα-iCre and nestin-Cre transgenic mouse models. Sci Rep 2022; 12:22099. [PMID: 36543864 PMCID: PMC9772212 DOI: 10.1038/s41598-022-26671-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022] Open
Abstract
Current scientific research is driven by the ability to manipulate gene expression by utilizing the Cre/loxP system in transgenic mouse models. However, artifacts in Cre-driver mouse lines that introduce undesired effects and confound results are increasingly being reported. Here, we show aberrant neuroinflammation and synaptic changes in two widely used Cre-driver mouse models. Neuroinflammation in CaMKIIα-iCre mice was characterized by the activation and proliferation of microglia and astrocytes in synaptic layers of the hippocampus. Increased GFAP and Iba1 levels were observed in hippocampal brain regions of 4-, 8- and 22-month-old CaMKIIα-iCre mice compared to WT littermates. Synaptic changes in NMDAR, AMPAR, PSD95 and phosphorylated CaMKIIα became apparent in 8-month-old CaMKIIα-iCre mice but were not observed in 4-month-old CaMKIIα-iCre mice. Synaptophysin and synaptoporin were unchanged in CaMKIIα-iCre compared to WT mice, suggesting that synaptic alterations may occur in excitatory postsynaptic regions in which iCre is predominantly expressed. Finally, hippocampal volume was reduced in 22-month-old CaMKIIα-iCre mice compared to WT mice. We tested the brains of mice of additional common Cre-driver mouse models for neuroinflammation; the nestin-Cre mouse model showed synaptic changes and astrocytosis marked by increased GFAP+ astrocytes in cortical and hippocampal regions, while the original CaMKIIα-Cre T29-1 strain was comparable to WT mice. The mechanisms underlying abnormal neuroinflammation in nestin-Cre and CaMKIIα-iCre are unknown but may be associated with high levels of Cre expression. Our findings are critical to the scientific community and demonstrate that the correct Cre-driver controls must be included in all studies using these mice.
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Affiliation(s)
- Alia O. Alia
- grid.16753.360000 0001 2299 3507The Ken and Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611 USA
| | - Sohee Jeon
- grid.16753.360000 0001 2299 3507The Ken and Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611 USA
| | - Jelena Popovic
- grid.16753.360000 0001 2299 3507The Ken and Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611 USA
| | - Miranda A. Salvo
- grid.16753.360000 0001 2299 3507The Ken and Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611 USA
| | - Katherine R. Sadleir
- grid.16753.360000 0001 2299 3507The Ken and Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611 USA
| | - Robert Vassar
- grid.16753.360000 0001 2299 3507The Ken and Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611 USA ,grid.16753.360000 0001 2299 3507Mesulam Center for Cognitive Neurology and Alzheimer’s Disease, Northwestern University Feinberg School of Medicine, Chicago, IL 60611 USA
| | - Leah K. Cuddy
- grid.16753.360000 0001 2299 3507The Ken and Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611 USA
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Efficient spatially targeted gene editing using a near-infrared activatable protein-conjugated nanoparticle for brain applications. Nat Commun 2022; 13:4135. [PMID: 35840564 PMCID: PMC9287341 DOI: 10.1038/s41467-022-31791-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 07/05/2022] [Indexed: 12/27/2022] Open
Abstract
Spatial control of gene expression is critical to modulate cellular functions and deconstruct the function of individual genes in biological processes. Light-responsive gene-editing formulations have been recently developed; however, they have shown limited applicability in vivo due to poor tissue penetration, limited cellular transfection and the difficulty in evaluating the activity of the edited cells. Here, we report a formulation composed of upconversion nanoparticles conjugated with Cre recombinase enzyme through a photocleavable linker, and a lysosomotropic agent that facilitates endolysosomal escape. This formulation allows in vitro spatial control in gene editing after activation with near-infrared light. We further demonstrate the potential of this formulation in vivo through three different paradigms: (i) gene editing in neurogenic niches, (ii) gene editing in the ventral tegmental area to facilitate monitoring of edited cells by precise optogenetic control of reward and reinforcement, and (iii) gene editing in a localized brain region via a noninvasive administration route (i.e., intranasal). Spatial control of gene expression allows precise control over biological processes. Here, the authors develop an efficient light-responsive formulation based on upconversion nanoparticles, and demonstrate on-demand genetic manipulation in deep brain tissue.
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SLITRK2 variants associated with neurodevelopmental disorders impair excitatory synaptic function and cognition in mice. Nat Commun 2022; 13:4112. [PMID: 35840571 PMCID: PMC9287327 DOI: 10.1038/s41467-022-31566-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 06/22/2022] [Indexed: 11/08/2022] Open
Abstract
SLITRK2 is a single-pass transmembrane protein expressed at postsynaptic neurons that regulates neurite outgrowth and excitatory synapse maintenance. In the present study, we report on rare variants (one nonsense and six missense variants) in SLITRK2 on the X chromosome identified by exome sequencing in individuals with neurodevelopmental disorders. Functional studies showed that some variants displayed impaired membrane transport and impaired excitatory synapse-promoting effects. Strikingly, these variations abolished the ability of SLITRK2 wild-type to reduce the levels of the receptor tyrosine kinase TrkB in neurons. Moreover, Slitrk2 conditional knockout mice exhibited impaired long-term memory and abnormal gait, recapitulating a subset of clinical features of patients with SLITRK2 variants. Furthermore, impaired excitatory synapse maintenance induced by hippocampal CA1-specific cKO of Slitrk2 caused abnormalities in spatial reference memory. Collectively, these data suggest that SLITRK2 is involved in X-linked neurodevelopmental disorders that are caused by perturbation of diverse facets of SLITRK2 function.
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Kim D, Jung H, Shirai Y, Kim H, Kim J, Lim D, Mori T, Lee H, Park D, Kim HY, Guo Q, Pang B, Qiu W, Cao X, Kouyama-Suzuki E, Uemura T, Kasem E, Fu Y, Kim S, Tokunaga A, Yoshizawa T, Suzuki T, Sakagami H, Lee KJ, Ko J, Tabuchi K, Um JW. IQSEC3 Deletion Impairs Fear Memory Through Upregulation of Ribosomal S6K1 Signaling in the Hippocampus. Biol Psychiatry 2022; 91:821-831. [PMID: 35219498 DOI: 10.1016/j.biopsych.2021.12.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 11/29/2021] [Accepted: 12/15/2021] [Indexed: 12/11/2022]
Abstract
BACKGROUND IQSEC3, a gephyrin-binding GABAergic (gamma-aminobutyric acidergic) synapse-specific guanine nucleotide exchange factor, was recently reported to regulate activity-dependent GABAergic synapse maturation, but the underlying signaling mechanisms remain incompletely understood. METHODS We generated mice with conditional knockout (cKO) of Iqsec3 to examine whether altered synaptic inhibition influences hippocampus-dependent fear memory formation. In addition, electrophysiological recordings, immunohistochemistry, and behavioral assays were used to address our question. RESULTS We found that Iqsec3-cKO induces a specific reduction in GABAergic synapse density, GABAergic synaptic transmission, and maintenance of long-term potentiation in the hippocampal CA1 region. In addition, Iqsec3-cKO mice exhibited impaired fear memory formation. Strikingly, Iqsec3-cKO caused abnormally enhanced activation of ribosomal P70-S6K1-mediated signaling in the hippocampus but not in the cortex. Furthermore, inhibiting upregulated S6K1 signaling by expressing dominant-negative S6K1 in the hippocampal CA1 of Iqsec3-cKO mice completely rescued impaired fear learning and inhibitory synapse density but not deficits in long-term potentiation maintenance. Finally, upregulated S6K1 signaling was rescued by IQSEC3 wild-type, but not by an ARF-GEF (adenosine diphosphate ribosylation factor-guanine nucleotide exchange factor) inactive IQSEC3 mutant. CONCLUSIONS Our results suggest that IQSEC3-mediated balanced synaptic inhibition in hippocampal CA1 is critical for the proper formation of hippocampus-dependent fear memory.
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Affiliation(s)
- Dongwook Kim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Hyeji Jung
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Yoshinori Shirai
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan
| | - Hyeonho Kim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Jinhu Kim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Dongseok Lim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Takuma Mori
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan; Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Hyojeong Lee
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Dongseok Park
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Hee Young Kim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Qi Guo
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan
| | - Bo Pang
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan
| | - Wen Qiu
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan
| | - Xueshan Cao
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan
| | - Emi Kouyama-Suzuki
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan
| | - Takeshi Uemura
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan
| | - Enas Kasem
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan; Department of Zoology, Faculty of Science, Kafrelsheikh University, Kafr el-Sheikh, Egypt
| | - Yu Fu
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan
| | - Seungjoon Kim
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Akinori Tokunaga
- Division of Laboratory Animal Resources, Life Science Research Laboratory, University of Fukui, Fukui, Japan
| | - Takahiro Yoshizawa
- Research Center for Supports to Advanced Science, Shinshu University, Nagano, Japan
| | - Tatsuo Suzuki
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan
| | - Hiroyuki Sakagami
- Department of Anatomy, Kitasato University School of Medicine, Kanagawa, Japan
| | - Kea Joo Lee
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea; Neural Circuits Research Group, Korea Brain Research Institute, Daegu, South Korea
| | - Jaewon Ko
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Katsuhiko Tabuchi
- Department of Molecular and Cellular Physiology, Institute of Medicine, Academic Assembly, Shinshu University, Nagano, Japan; Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan.
| | - Ji Won Um
- Department of Brain and Cognitive Sciences, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea.
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10
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McNeilly AD, Yianakas A, Gallagher JG, Tarlton J, Ashford ML, McCrimmon RJ. Central deficiency of IL-6Ra in mice impairs glucose-stimulated insulin secretion. Mol Metab 2022; 61:101488. [PMID: 35470093 PMCID: PMC9065900 DOI: 10.1016/j.molmet.2022.101488] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 03/16/2022] [Accepted: 03/28/2022] [Indexed: 11/16/2022] Open
Affiliation(s)
- Alison D McNeilly
- Division of Systems Medicine, School of Medicine, University of Dundee, Ninewells Hospital and Medical School, Dundee, DD1 9SY, UK.
| | - Adonis Yianakas
- Division of Systems Medicine, School of Medicine, University of Dundee, Ninewells Hospital and Medical School, Dundee, DD1 9SY, UK
| | - Jennifer G Gallagher
- Division of Systems Medicine, School of Medicine, University of Dundee, Ninewells Hospital and Medical School, Dundee, DD1 9SY, UK
| | - Jamie Tarlton
- Division of Systems Medicine, School of Medicine, University of Dundee, Ninewells Hospital and Medical School, Dundee, DD1 9SY, UK
| | - Michael Lj Ashford
- Division of Systems Medicine, School of Medicine, University of Dundee, Ninewells Hospital and Medical School, Dundee, DD1 9SY, UK
| | - Rory J McCrimmon
- Division of Systems Medicine, School of Medicine, University of Dundee, Ninewells Hospital and Medical School, Dundee, DD1 9SY, UK
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11
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Zhang Z, Zamojski M, Smith GR, Willis TL, Yianni V, Mendelev N, Pincas H, Seenarine N, Amper MAS, Vasoya M, Cheng WS, Zaslavsky E, Nair VD, Turgeon JL, Bernard DJ, Troyanskaya OG, Andoniadou CL, Sealfon SC, Ruf-Zamojski F. Single nucleus transcriptome and chromatin accessibility of postmortem human pituitaries reveal diverse stem cell regulatory mechanisms. Cell Rep 2022; 38:110467. [PMID: 35263594 PMCID: PMC8957708 DOI: 10.1016/j.celrep.2022.110467] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 11/23/2021] [Accepted: 02/09/2022] [Indexed: 01/07/2023] Open
Abstract
Despite their importance in tissue homeostasis and renewal, human pituitary stem cells (PSCs) are incompletely characterized. We describe a human single nucleus RNA-seq and ATAC-seq resource from pediatric, adult, and aged postmortem pituitaries (snpituitaryatlas.princeton.edu) and characterize cell-type-specific gene expression and chromatin accessibility programs for all major pituitary cell lineages. We identify uncommitted PSCs, committing progenitor cells, and sex differences. Pseudotime trajectory analysis indicates that early-life PSCs are distinct from the other age groups. Linear modeling of same-cell multiome data identifies regulatory domain accessibility sites and transcription factors that are significantly associated with gene expression in PSCs compared with other cell types and within PSCs. We identify distinct deterministic mechanisms that contribute to heterogeneous marker expression within PSCs. These findings characterize human stem cell lineages and reveal diverse mechanisms regulating key PSC genes and cell type identity. This study profiles the gene expression and chromatin accessibility landscapes in postmortem male and female pituitaries of different ages using single nucleus multiomics technologies. Zhang et al. characterize the pituitary stem cell population and develop computational methods, which allow us to elucidate regulatory mechanisms underlying pituitary stem cell identity.
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Affiliation(s)
- Zidong Zhang
- Lewis-Sigler Institute for Integrative Genomics and Graduate Program in Quantitative and Computational Biology, Princeton University, Princeton, NJ, USA
| | - Michel Zamojski
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Gregory R Smith
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Thea L Willis
- Center for Craniofacial and Regenerative Biology, King's College London, London, UK
| | - Val Yianni
- Center for Craniofacial and Regenerative Biology, King's College London, London, UK
| | - Natalia Mendelev
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Hanna Pincas
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Nitish Seenarine
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Mary Anne S Amper
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Mital Vasoya
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Wan Sze Cheng
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Elena Zaslavsky
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Venugopalan D Nair
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA
| | - Judith L Turgeon
- Department of Internal Medicine, University of California, Davis, Davis, CA, USA
| | - Daniel J Bernard
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, H3G 1Y6, Canada
| | - Olga G Troyanskaya
- Lewis-Sigler Institute for Integrative Genomics and Graduate Program in Quantitative and Computational Biology, Princeton University, Princeton, NJ, USA; Department of Computer Science, Princeton University, Princeton, NJ, USA; Flatiron Institute, Simons Foundation, New York, NY, USA
| | - Cynthia L Andoniadou
- Center for Craniofacial and Regenerative Biology, King's College London, London, UK; Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
| | - Stuart C Sealfon
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA.
| | - Frederique Ruf-Zamojski
- Department of Neurology, Center for Advanced Research on Diagnostic Assays, Icahn School of Medicine at Mount Sinai (ISMMS), New York, NY, USA.
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12
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Wasinski F, Teixeira PDS, List EO, Kopchick JJ, Donato J. Growth hormone receptor contributes to the activation of STAT5 in the hypothalamus of pregnant mice. Neurosci Lett 2021; 770:136402. [PMID: 34929316 DOI: 10.1016/j.neulet.2021.136402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 12/03/2021] [Accepted: 12/14/2021] [Indexed: 11/19/2022]
Abstract
Growth hormone (GH) receptor (GHR) signaling induces the phosphorylation of the signal transducer and activator of transcription 5 (pSTAT5) in the cells of several tissues including in the hypothalamus. During pregnancy, several STAT5-recruiting hormones (e.g., prolactin, GH and placental lactogens) are highly secreted. However, the precise contribution of GHR signaling to the surge of pSTAT5 immunoreactive neurons that occurs in the hypothalamus of pregnant mice is currently unknown. Thus, the objective of the present study was to determine whether GHR expression in neurons is required for inducing pSTAT5 expression in several hypothalamic nuclei during pregnancy. Initially, we demonstrated that late pregnant C57BL/6 mice (gestational day 14 to 18) exhibited increased pulsatile GH secretion compared to virgin females. Next, we confirmed that neuron-specific GHR ablation robustly reduces hypothalamic Ghr mRNA levels and prevents GH-induced pSTAT5 in the arcuate, paraventricular and ventromedial hypothalamic nuclei. Subsequently, the number of pSTAT5 immunoreactive cells was determined in the hypothalamus of late pregnant mice. Although neuron-specific GHR ablation did not affect the number of pSTAT5 immunoreactive cells in the paraventricular nucleus of the hypothalamus, reduced pSTAT5 expression was observed in the arcuate and ventromedial nuclei of pregnant neuron-specific GHR knockouts, compared to control pregnant mice. In summary, a subset of hypothalamic neurons requires GHR signaling to express pSTAT5 during pregnancy. These findings contribute to the understanding of the endocrine factors that affect the activation of transcription factors in the brain during pregnancy.
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Affiliation(s)
- Frederick Wasinski
- Universidade de Sao Paulo, Instituto de Ciencias Biomedicas, Departamento de Fisiologia e Biofísica, Sao Paulo 05508000, Brazil
| | - Pryscila D S Teixeira
- Universidade de Sao Paulo, Instituto de Ciencias Biomedicas, Departamento de Fisiologia e Biofísica, Sao Paulo 05508000, Brazil
| | - Edward O List
- Edison Biotechnology Institute and Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - John J Kopchick
- Edison Biotechnology Institute and Heritage College of Osteopathic Medicine, Ohio University, Athens, OH 45701, USA
| | - Jose Donato
- Universidade de Sao Paulo, Instituto de Ciencias Biomedicas, Departamento de Fisiologia e Biofísica, Sao Paulo 05508000, Brazil.
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13
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Paternoster V, Edhager AV, Qvist P, Donskov JG, Shliaha P, Jensen ON, Mors O, Nielsen AL, Børglum AD, Palmfeldt J, Christensen JH. Inactivation of the Schizophrenia-associated BRD1 gene in Brain Causes Failure-to-thrive, Seizure Susceptibility and Abnormal Histone H3 Acetylation and N-tail Clipping. Mol Neurobiol 2021; 58:4495-4505. [PMID: 34056693 DOI: 10.1007/s12035-021-02432-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 05/14/2021] [Indexed: 10/21/2022]
Abstract
Genetic studies have repeatedly shown that the Bromodomain containing 1 gene, BRD1, is involved in determining mental health, and the importance of the BRD1 protein for normal brain function has been studied in both cell models and constitutive haploinsufficient Brd1+/- mice. Homozygosity for inactivated Brd1 alleles is lethal during embryonic development in mice. In order to further characterize the molecular functions of BRD1 in the brain, we have developed a novel Brd1 knockout mouse model (Brd1-/-) with bi-allelic conditional inactivation of Brd1 in the central nervous system. Brd1-/- mice were viable but smaller and with reduced muscle strength. They showed reduced exploratory behavior and increased sensitivity to pentylenetetrazole-induced seizures supporting the previously described GABAergic dysfunction in constitutive Brd1+/- mice. Because BRD1 takes part in protein complexes with histone binding and modifying functions, we investigated the effect of BRD1 depletion on the global histone modification pattern in mouse brain by mass spectrometry. We found decreased levels of histone H3 acetylation (H3K9ac, H3K14ac, and H3K18ac) and increased N-tail clipping in consequence of BRD1 depletion. Collectively, the presented results support that BRD1 controls gene expression at the epigenetic level by regulating histone H3 proteoforms in the brain.
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Affiliation(s)
- Veerle Paternoster
- The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Høegh-Guldbergs Gade 10, DK-8000, Aarhus C, Denmark.,Centre for Integrative Sequencing, iSEQ, Aarhus University, Aarhus, Denmark.,Centre for Genomics and Personalized Medicine, CGPM, Aarhus University, Aarhus, Denmark
| | - Anders Valdemar Edhager
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.,Research Unit for Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Per Qvist
- The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Høegh-Guldbergs Gade 10, DK-8000, Aarhus C, Denmark.,Centre for Integrative Sequencing, iSEQ, Aarhus University, Aarhus, Denmark.,Centre for Genomics and Personalized Medicine, CGPM, Aarhus University, Aarhus, Denmark
| | - Julie Grinderslev Donskov
- The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Høegh-Guldbergs Gade 10, DK-8000, Aarhus C, Denmark.,Centre for Integrative Sequencing, iSEQ, Aarhus University, Aarhus, Denmark.,Centre for Genomics and Personalized Medicine, CGPM, Aarhus University, Aarhus, Denmark
| | - Pavel Shliaha
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Ole Nørregaard Jensen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Ole Mors
- The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Denmark.,Centre for Integrative Sequencing, iSEQ, Aarhus University, Aarhus, Denmark.,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.,Psychosis Research Unit, Department of Clinical Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Anders Lade Nielsen
- Department of Biomedicine, Aarhus University, Høegh-Guldbergs Gade 10, DK-8000, Aarhus C, Denmark
| | - Anders Dupont Børglum
- The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Denmark.,Department of Biomedicine, Aarhus University, Høegh-Guldbergs Gade 10, DK-8000, Aarhus C, Denmark.,Centre for Integrative Sequencing, iSEQ, Aarhus University, Aarhus, Denmark.,Centre for Genomics and Personalized Medicine, CGPM, Aarhus University, Aarhus, Denmark
| | - Johan Palmfeldt
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.,Research Unit for Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Jane Hvarregaard Christensen
- The Lundbeck Foundation Initiative for Integrative Psychiatric Research, iPSYCH, Aarhus, Denmark. .,Department of Biomedicine, Aarhus University, Høegh-Guldbergs Gade 10, DK-8000, Aarhus C, Denmark. .,Centre for Integrative Sequencing, iSEQ, Aarhus University, Aarhus, Denmark. .,Centre for Genomics and Personalized Medicine, CGPM, Aarhus University, Aarhus, Denmark.
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14
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Tomas D, McLeod VM, Chiam MDF, Wanniarachchillage N, Boon WC, Turner BJ. Dissociation of disease onset, progression and sex differences from androgen receptor levels in a mouse model of amyotrophic lateral sclerosis. Sci Rep 2021; 11:9255. [PMID: 33927243 PMCID: PMC8085012 DOI: 10.1038/s41598-021-88415-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 03/30/2021] [Indexed: 01/14/2023] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is an adult-onset neurodegenerative disorder caused by loss of motor neurons. ALS incidence is skewed towards males with typically earlier age of onset and limb site of onset. The androgen receptor (AR) is the major mediator of androgen effects in the body and is present extensively throughout the central nervous system, including motor neurons. Mutations in the AR gene lead to selective lower motor neuron degeneration in male spinal bulbar muscular atrophy (SBMA) patients, emphasising the importance of AR in maintaining motor neuron health and survival. To evaluate a potential role of AR in onset and progression of ALS, we generated SOD1G93A mice with either neural AR deletion or global human AR overexpression. Using a Cre-LoxP conditional gene knockout strategy, we report that neural deletion of AR has minimal impact on the disease course in SOD1G93A male mice. This outcome was potentially confounded by the metabolically disrupted Nestin-Cre phenotype, which likely conferred the profound lifespan extension observed in the SOD1G93A double transgenic male mice. In addition, overexpression of human AR produced no benefit to disease onset and progression in SOD1G93A mice. In conclusion, the disease course of SOD1G93A mice is independent of AR expression levels, implicating other mechanisms involved in mediating the sex differences in ALS. Our findings using Nestin-Cre mice, which show an inherent metabolic phenotype, led us to hypothesise that targeting hypermetabolism associated with ALS may be a more potent modulator of disease, than AR in this mouse model.
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Affiliation(s)
- Doris Tomas
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, 30 Royal Parade, Parkville, VIC, 3052, Australia
| | - Victoria M McLeod
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, 30 Royal Parade, Parkville, VIC, 3052, Australia
| | - Mathew D F Chiam
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, 30 Royal Parade, Parkville, VIC, 3052, Australia
| | - Nayomi Wanniarachchillage
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, 30 Royal Parade, Parkville, VIC, 3052, Australia
| | - Wah C Boon
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, 30 Royal Parade, Parkville, VIC, 3052, Australia
| | - Bradley J Turner
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, 30 Royal Parade, Parkville, VIC, 3052, Australia.
- Perron Institute for Neurological and Translational Science, Queen Elizabeth Medical Centre, Nedlands, WA, 6150, Australia.
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15
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Matsuno K, Nagashima S, Shiiba I, Taniwaka K, Takeda K, Tokuyama T, Ito N, Matsushita N, Fukuda T, Ishido S, Inatome R, Yanagi S. MITOL dysfunction causes dwarfism with anterior pituitary hypoplasia. J Biochem 2021; 168:305-312. [PMID: 32302394 DOI: 10.1093/jb/mvaa050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 04/03/2020] [Indexed: 11/12/2022] Open
Abstract
In mitochondrial disorders, short stature and growth failure are common symptoms, but their underlying mechanism remains unknown. In this study, we examined the cause of growth failure of mice induced by nestin promoter-driven knockout of the mitochondrial ubiquitin ligase MITOL (MARCH5), a key regulator of mitochondrial function. MITOL-knockout mice have congenital hypoplasia of the anterior pituitary caused by decreased expression of pituitary transcript factor 1 (Pit1). Consistently, both mRNA levels of growth hormone (GH) and prolactin levels were markedly decreased in the anterior pituitary of mutant mice. Growth failure of mutant mice was partly rescued by hypodermic injection of recombinant GH. To clarify whether this abnormality was induced by the primary effect of MITOL knockdown in the anterior pituitary or a secondary effect of other lesions, we performed lentiviral-mediated knockdown of MITOL on cultured rat pituitary GH3 cells, which secrete GH. GH production was severely compromised in MITOL-knockdown GH3 cells. In conclusion, MITOL plays a critical role in the development of the anterior pituitary; therefore, mice with MITOL dysfunction exhibited pituitary dwarfism caused by anterior pituitary hypoplasia. Our findings suggest that mitochondrial dysfunction is commonly involved in the unknown pathogenesis of pituitary dwarfism.
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Affiliation(s)
- Keigo Matsuno
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Shun Nagashima
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Isshin Shiiba
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Keito Taniwaka
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Keisuke Takeda
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Takeshi Tokuyama
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Naoki Ito
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Nobuko Matsushita
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Toshifumi Fukuda
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Satoshi Ishido
- Department of Microbiology, Hyogo College of Medicine, 1-1, Mukogawa-cho, Nishinomiya 663-8501, Japan
| | - Ryoko Inatome
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
| | - Shigeru Yanagi
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392
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16
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Altered baseline and amphetamine-mediated behavioral profiles in dopamine transporter Cre (DAT-Ires-Cre) mice compared to tyrosine hydroxylase Cre (TH-Cre) mice. Psychopharmacology (Berl) 2020; 237:3553-3568. [PMID: 32778904 PMCID: PMC10120402 DOI: 10.1007/s00213-020-05635-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 07/31/2020] [Indexed: 02/06/2023]
Abstract
RATIONALE Transgenic mouse lines expressing Cre-recombinase under the regulation of either dopamine transporter (DAT) or tyrosine hydroxylase (TH) promoters are commonly used to study the dopamine (DA) system. While use of the TH promoter appears to have less liability to changes in native gene expression, transgene insertion in the DAT locus results in reduced DAT expression and function. This confound is sometimes overlooked in genetically targeted behavioral experiments. OBJECTIVES We sought to evaluate the suitability of DAT-Ires-Cre and TH-Cre transgenic lines for behavioral pharmacology experiments with DA agonists. We hypothesized that DAT-Ires-Cre expression would impact DAT-mediated behaviors, but no impact of TH-Cre expression would be observed. METHODS DAT-Ires-Cre and TH-Cre mice bred on mixed 129S6/C57BL/6 and pure C57BL/6 backgrounds were evaluated for novelty-induced, baseline, and amphetamine (AMPH)-induced locomotion, and for AMPH and D1 agonist (SKF-38393)-induced preservative behaviors. RESULTS DAT-Ires-Cre mice on both mixed 129S6/C57BL/6 and pure C57BL/6 backgrounds displayed increased novelty-induced activity and decreased AMPH-induced locomotion, with mixed results for AMPH-induced stereotypy. TH-Cre mice on both backgrounds showed typical baseline activity and AMPH-induced stereotypy, with a difference in AMPH-induced locomotion observed only on the mixed background. Both transgenic lines displayed unaltered SKF-38393-induced grooming behavior. CONCLUSIONS Our findings indicate that the DAT-Ires-Cre transgenic line may lead to confounds for experiments that are dependent on DAT expression. The TH-Cre transgenic line studied here may be a more useful option, depending on background strain, because of its lack of baseline and drug-induced phenotypes. These data highlight the importance of appropriate controls in studies employing transgenic mice.
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17
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McRae HM, Eccles S, Whitehead L, Alexander WS, Gécz J, Thomas T, Voss AK. Downregulation of the GHRH/GH/IGF1 axis in a mouse model of Börjeson-Forssman-Lehman syndrome. Development 2020; 147:dev.187021. [PMID: 32994169 DOI: 10.1242/dev.187021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 09/09/2020] [Indexed: 12/28/2022]
Abstract
Börjeson-Forssman-Lehmann syndrome (BFLS) is an intellectual disability and endocrine disorder caused by plant homeodomain finger 6 (PHF6) mutations. Individuals with BFLS present with short stature. We report a mouse model of BFLS, in which deletion of Phf6 causes a proportional reduction in body size compared with control mice. Growth hormone (GH) levels were reduced in the absence of PHF6. Phf6 - /Y animals displayed a reduction in the expression of the genes encoding GH-releasing hormone (GHRH) in the brain, GH in the pituitary gland and insulin-like growth factor 1 (IGF1) in the liver. Phf6 deletion specifically in the nervous system caused a proportional growth defect, indicating a neuroendocrine contribution to the phenotype. Loss of suppressor of cytokine signaling 2 (SOCS2), a negative regulator of growth hormone signaling partially rescued body size, supporting a reversible deficiency in GH signaling. These results demonstrate that PHF6 regulates the GHRH/GH/IGF1 axis.
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Affiliation(s)
- Helen M McRae
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria 3052, Australia.,Department of Medical Biology, The University of Melbourne, Victoria 3052, Australia
| | - Samantha Eccles
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria 3052, Australia
| | - Lachlan Whitehead
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria 3052, Australia.,Department of Medical Biology, The University of Melbourne, Victoria 3052, Australia
| | - Warren S Alexander
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria 3052, Australia.,Department of Medical Biology, The University of Melbourne, Victoria 3052, Australia
| | - Jozef Gécz
- Adelaide Medical School and the Robinson Research Institute, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Tim Thomas
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria 3052, Australia .,Department of Medical Biology, The University of Melbourne, Victoria 3052, Australia
| | - Anne K Voss
- Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria 3052, Australia .,Department of Medical Biology, The University of Melbourne, Victoria 3052, Australia
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18
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Dey S, Cui Z, Gavrilova O, Zhang X, Gassmann M, Noguchi CT. Sex-specific brain erythropoietin regulation of mouse metabolism and hypothalamic inflammation. JCI Insight 2020; 5:134061. [PMID: 32078583 DOI: 10.1172/jci.insight.134061] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 02/12/2020] [Indexed: 12/17/2022] Open
Abstract
The blood hormone erythropoietin (EPO), upon binding to its receptor (EpoR), modulates high-fat diet-induced (HFD-induced) obesity in mice, improves glucose tolerance, and prevents white adipose tissue inflammation. Transgenic mice with constitutive overexpression of human EPO solely in the brain (Tg21) were used to assess the neuroendocrine EPO effect without increasing the hematocrit. Male Tg21 mice resisted HFD-induced weight gain; showed lower serum adrenocorticotropic hormone, corticosterone, and C-reactive protein levels; and prevented myeloid cell recruitment to the hypothalamus compared with WT male mice. HFD-induced hypothalamic inflammation (HI) and microglial activation were higher in male mice, and Tg21 male mice exhibited a lower increase in HI than WT male mice. Physiological EPO function in the brain also showed sexual dimorphism in regulating HFD response. Female estrogen production blocked reduced weight gain and HI. Targeted deletion of EpoR gene expression in neuronal cells worsened HFD-induced glucose intolerance in both male and female mice but increased weight gain and HI in the hypothalamus in male mice only. Both male and female Tg21 mice kept on normal chow and HFD showed significantly improved glycemic control. Our data indicate that cerebral EPO regulates weight gain and HI in a sex-dependent response, distinct from EPO regulation of glycemic control, and independent of erythropoietic EPO response.
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Affiliation(s)
| | | | | | - Xiaojie Zhang
- Laboratory of Animal Sciences Section, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland, USA
| | - Max Gassmann
- Institute of Veterinary Physiology and Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.,Universidad Peruana Cayetano Heredia, Lima, Peru
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19
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Liu X, Hu G, Ye J, Ye B, Shen N, Tao Y, Zhang X, Fan Y, Liu H, Zhang Z, Fang D, Gu X, Mo X, Yu Y. De Novo ARID1B mutations cause growth delay associated with aberrant Wnt/β-catenin signaling. Hum Mutat 2020; 41:1012-1024. [PMID: 31981384 DOI: 10.1002/humu.23990] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 12/25/2019] [Accepted: 01/19/2020] [Indexed: 12/20/2022]
Abstract
Haploinsufficiency of ARID1B (AT-rich interaction domain 1B) has been involved in autism spectrum disorder, nonsyndromic and syndromic intellectual disability, and corpus callosum agenesis. Growth impairment is a major clinical feature caused by ARID1B mutations; however, the mechanistic link has not been elucidated. Here, we confirm that growth delay is a common characteristic of patients with ARID1B mutations, which may be associated with dysregulation of the Wnt/β-catenin signaling pathway. An analysis of patients harboring pathogenic variants of ARID1B revealed that nearly half had short stature and nearly all had below-average height. Moreover, the percentage of patients with short stature increased with age. Knockdown of arid1b in zebrafish embryos markedly reduced body length and perturbed the expression of both chondrogenic and osteogenic genes including sox9a, col2a1a, runx2b, and col10a1. Knockout of Arid1b in chondrogenic ATDC5 cells inhibited chondrocyte proliferation and differentiation. Finally, Wnt/β-catenin signaling was perturbed in Arid1b-depleted zebrafish embryos and Arid1b knockout ATDC5 cells. These data indicate that ARID1B modulates bone growth possibly via regulation of the Wnt/β-catenin pathway, and may be an appropriate target for gene therapy in disorders of growth and development.
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Affiliation(s)
- Xiaomin Liu
- Department of Pediatric Endocrinology/Genetics, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Guorui Hu
- Department of Pediatric Endocrinology/Genetics, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jun Ye
- Department of Pediatric Endocrinology/Genetics, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bin Ye
- Department of Pediatric Internal Medicine, Taizhou Central Hospital, Taizhou University Hospital, Taizhou, China
| | - Nan Shen
- The Laboratory of Pediatric Infectious Diseases, Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yue Tao
- The Laboratory of Pediatric Infectious Diseases, Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xia Zhang
- Department of Pediatric Endocrinology/Genetics, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yanjie Fan
- Department of Pediatric Endocrinology/Genetics, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Huili Liu
- Department of Pediatric Endocrinology/Genetics, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhigang Zhang
- Department of Pediatric Internal Medicine, Taizhou Central Hospital, Taizhou University Hospital, Taizhou, China
| | - Danfeng Fang
- Department of Pediatric Internal Medicine, Taizhou Central Hospital, Taizhou University Hospital, Taizhou, China
| | - Xuefan Gu
- Department of Pediatric Endocrinology/Genetics, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xi Mo
- The Laboratory of Pediatric Infectious Diseases, Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yongguo Yu
- Department of Pediatric Endocrinology/Genetics, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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20
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MANF Ablation Causes Prolonged Activation of the UPR without Neurodegeneration in the Mouse Midbrain Dopamine System. eNeuro 2020; 7:ENEURO.0477-19.2019. [PMID: 32005751 PMCID: PMC7053174 DOI: 10.1523/eneuro.0477-19.2019] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 12/20/2019] [Accepted: 12/20/2019] [Indexed: 01/08/2023] Open
Abstract
Mesencephalic astrocyte-derived neurotrophic factor (MANF) is an endoplasmic reticulum (ER) localized protein that regulates ER homeostasis and unfolded protein response (UPR). The biology of endogenous MANF in the mammalian brain is unknown and therefore we studied the brain phenotype of MANF-deficient female and male mice at different ages focusing on the midbrain dopamine system and cortical neurons. We show that a lack of MANF from the brain led to the chronic activation of UPR by upregulation of the endoribonuclease activity of the inositol-requiring enzyme 1α (IRE1α) pathway. Furthermore, in the aged MANF-deficient mouse brain in addition the protein kinase-like ER kinase (PERK) and activating transcription factor 6 (ATF6) branches of the UPR pathways were activated. Neuronal loss in neurodegenerative diseases has been associated with chronic ER stress. In our mouse model, increased UPR activation did not lead to neuronal cell loss in the substantia nigra (SN), decrease of striatal dopamine or behavioral changes of MANF-deficient mice. However, cortical neurons lacking MANF were more vulnerable to chemical induction of additional ER stress in vitro. We conclude that embryonic neuronal deletion of MANF does not cause the loss of midbrain dopamine neurons in mice. However, endogenous MANF is needed for maintenance of neuronal ER homeostasis both in vivo and in vitro.
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21
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Jin J, Ravindran P, Di Meo D, Püschel AW. Igf1R/InsR function is required for axon extension and corpus callosum formation. PLoS One 2019; 14:e0219362. [PMID: 31318893 PMCID: PMC6638864 DOI: 10.1371/journal.pone.0219362] [Citation(s) in RCA: 7] [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: 11/27/2018] [Accepted: 06/21/2019] [Indexed: 12/02/2022] Open
Abstract
One of the earliest steps during the development of the nervous system is the establishment of neuronal polarity and the formation of an axon. The intrinsic mechanisms that promote axon formation have been extensively analyzed. However, much less is known about the extrinsic signals that initiate axon formation. One of the candidates for these signals is Insulin-like growth factor 1 (Igf1) that acts through the Igf1 (Igf1R) and insulin receptors (InsR). Since Igf1R and InsR may act redundantly we analyzed conditional cortex-specific knockout mice that are deficient for both Igf1r and Insr to determine if they regulate the development of the cortex and the formation of axons in vivo. Our results show that Igf1R/InsR function is required for the normal development of the embryonic hippocampus and cingulate cortex while the lateral cortex does not show apparent defects in the Igf1r;Insr knockout. In the cingulate cortex, the number of intermediate progenitors and deep layer neurons is reduced and the corpus callosum is absent at E17. However, cortical organization and axon formation are not impaired in knockout embryos. In culture, cortical and hippocampal neurons from Igf1r;Insr knockout embryos extend an axon but the length of this axon is severely reduced. Our results indicate that Igf1R/InsR function is required for brain development in a region-specific manner and promotes axon growth but is not essential for neuronal polarization and migration in the developing brain.
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Affiliation(s)
- Jing Jin
- Institut für Molekulare Zellbiologie, University of Münster, Münster, Germany
- Cells-in-Motion Cluster of Excellence, University of Münster, Münster, Germany
| | | | - Danila Di Meo
- Institut für Molekulare Zellbiologie, University of Münster, Münster, Germany
- Cells-in-Motion Cluster of Excellence, University of Münster, Münster, Germany
| | - Andreas W. Püschel
- Institut für Molekulare Zellbiologie, University of Münster, Münster, Germany
- Cells-in-Motion Cluster of Excellence, University of Münster, Münster, Germany
- * E-mail:
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22
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Maimaiti S, Koshida R, Ojima M, Kulathunga K, Oishi H, Takahashi S. Neuron-specific Mafb knockout causes growth retardation accompanied by an impaired growth hormone/insulin-like growth factor I axis. Exp Anim 2019; 68:435-442. [PMID: 31092767 PMCID: PMC6842794 DOI: 10.1538/expanim.18-0182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Mammalian postnatal growth is regulated primarily by the growth hormone (GH)/insulin-like
growth factor I (IGF-I) axis. MafB is a basic leucine zipper (bZip) transcription factor
that has pleiotropic functions. Although MafB plays a critical role in fetal brain
development, such as in guidance for hindbrain segmentation, its postnatal role in neurons
remains to be elucidated. To investigate this, we used neuron-specific
Mafb conditional knockout (cKO) mice. In addition to an approximately
50% neonatal viability, the Mafb cKO mice exhibited growth retardation
without apparent signs of low energy intake. Notably, serum IGF-I levels of these mice in
the postnatal stage were lower than those of control mice. They seemed to have a
neuroendocrine dysregulation, as shown by the upregulation of serum GH levels in the
resting state and an inconsistent secretory response of GH upon administration of growth
hormone-releasing hormone. These findings reveal that neuronal MafB plays an important
role in postnatal development regulated by the GH/IGF-I axis.
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Affiliation(s)
- Shayida Maimaiti
- Department of Anatomy and Embryology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan.,Present address: Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0412, Japan
| | - Ryusuke Koshida
- Department of Anatomy and Neuroscience, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Masami Ojima
- Department of Anatomy and Embryology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Kaushalya Kulathunga
- Department of Anatomy and Embryology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan.,Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Hisashi Oishi
- Department of Comparative and Experimental Medicine, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan
| | - Satoru Takahashi
- Department of Anatomy and Embryology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
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23
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Moffat JJ, Jung EM, Ka M, Smith AL, Jeon BT, Santen GWE, Kim WY. The role of ARID1B, a BAF chromatin remodeling complex subunit, in neural development and behavior. Prog Neuropsychopharmacol Biol Psychiatry 2019; 89:30-38. [PMID: 30149092 PMCID: PMC6249083 DOI: 10.1016/j.pnpbp.2018.08.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 08/22/2018] [Accepted: 08/23/2018] [Indexed: 01/08/2023]
Abstract
Haploinsufficiency of the chromatin remodeling factor ARID1B leads to autism spectrum disorder and intellectual disability. Several independent research groups, including our own, recently examined the effects of heterozygous deletion of Arid1b in mice and reported severe behavioral abnormalities reminiscent of autism spectrum disorders and intellectual disability as well as marked changes in gene expression and decreased body size. Arid1b heterozygous mice also display significant cortical excitatory/inhibitory imbalance due to altered GABAergic neuron numbers and impaired inhibitory synaptic transmission. Abnormal epigenetic modifications, including histone acetylation and methylation, are additionally associated with Arid1b haploinsufficiency in the brain. Treating adult Arid1b mutant mice with a positive GABA allosteric modulator, however, rescues multiple behavioral abnormalities, such as cognitive and social impairments, as well as elevated anxiety. While treating Arid1b haploinsufficient mice with recombinant mouse growth hormone successfully increases body size, it has no effect on aberrant behavior. Here we summarize the recent findings regarding the role of ARID1B in brain development and behavior and discuss the utility of the Arid1b heterozygous mouse model in neurodevelopmental and psychiatric research. We also discuss some of the opportunities and potential challenges in developing translational applications for humans and possible avenues for further research into the mechanisms of ARID1B pathology in the brain.
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Affiliation(s)
| | - Eui-Man Jung
- University of Nebraska Medical Center, Omaha, NE 68198, USA
| | - Minhan Ka
- Research Center for Substance Abuse Pharmacology, Korea Institute of Toxicology, Daejeon, Republic of
Korea
| | | | - Byeong Tak Jeon
- Department of Biological Sciences, Kent State University, Kent, OH 44242, USA
| | - Gijs W. E. Santen
- Department of Clinical Genetics, Leiden University Medical Center, Leiden, Netherlands
| | - Woo-Yang Kim
- Department of Biological Sciences, Kent State University, Kent, OH 44242, USA.
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24
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Goodwin LO, Splinter E, Davis TL, Urban R, He H, Braun RE, Chesler EJ, Kumar V, van Min M, Ndukum J, Philip VM, Reinholdt LG, Svenson K, White JK, Sasner M, Lutz C, Murray SA. Large-scale discovery of mouse transgenic integration sites reveals frequent structural variation and insertional mutagenesis. Genome Res 2019; 29:494-505. [PMID: 30659012 PMCID: PMC6396414 DOI: 10.1101/gr.233866.117] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 01/14/2019] [Indexed: 01/05/2023]
Abstract
Transgenesis has been a mainstay of mouse genetics for over 30 yr, providing numerous models of human disease and critical genetic tools in widespread use today. Generated through the random integration of DNA fragments into the host genome, transgenesis can lead to insertional mutagenesis if a coding gene or an essential element is disrupted, and there is evidence that larger scale structural variation can accompany the integration. The insertion sites of only a tiny fraction of the thousands of transgenic lines in existence have been discovered and reported, due in part to limitations in the discovery tools. Targeted locus amplification (TLA) provides a robust and efficient means to identify both the insertion site and content of transgenes through deep sequencing of genomic loci linked to specific known transgene cassettes. Here, we report the first large-scale analysis of transgene insertion sites from 40 highly used transgenic mouse lines. We show that the transgenes disrupt the coding sequence of endogenous genes in half of the lines, frequently involving large deletions and/or structural variations at the insertion site. Furthermore, we identify a number of unexpected sequences in some of the transgenes, including undocumented cassettes and contaminating DNA fragments. We demonstrate that these transgene insertions can have phenotypic consequences, which could confound certain experiments, emphasizing the need for careful attention to control strategies. Together, these data show that transgenic alleles display a high rate of potentially confounding genetic events and highlight the need for careful characterization of each line to assure interpretable and reproducible experiments.
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Affiliation(s)
| | | | | | - Rachel Urban
- The Jackson Laboratory, Bar Harbor, Maine 04609, USA
| | - Hao He
- The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut 06032, USA
| | | | | | - Vivek Kumar
- The Jackson Laboratory, Bar Harbor, Maine 04609, USA
| | - Max van Min
- Cergentis B.V., 3584 CM Utrecht, The Netherlands
| | - Juliet Ndukum
- The Jackson Laboratory, Bar Harbor, Maine 04609, USA
| | | | | | - Karen Svenson
- The Jackson Laboratory, Bar Harbor, Maine 04609, USA
| | | | | | - Cathleen Lutz
- The Jackson Laboratory, Bar Harbor, Maine 04609, USA
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25
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de Faudeur G, Brouwers B, Schuit F, Creemers JWM, Ramos-Molina B. Transgenic Artifacts Caused by Passenger Human Growth Hormone. Trends Endocrinol Metab 2018; 29:670-674. [PMID: 29921469 DOI: 10.1016/j.tem.2018.05.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 05/18/2018] [Accepted: 05/29/2018] [Indexed: 12/26/2022]
Abstract
The minigene encoding human growth hormone (hGH) has been incorporated into over 300 transgenic mouse lines to improve transgene expression. However, unexpected and functional hGH expression can drastically alter physiology. We list here the mouse lines in which ectopic hGH has been confirmed, and we provide a wiki for lines awaiting analysis.
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Affiliation(s)
- Geoffroy de Faudeur
- Gene Expression Unit, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium; These authors contributed equally
| | - Bas Brouwers
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven, Belgium; Metabolic Research Laboratories, Wellcome Trust Medical Research Council (MRC) Institute of Metabolic Science, University of Cambridge, Cambridge, UK; These authors contributed equally
| | - Frans Schuit
- Gene Expression Unit, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - John W M Creemers
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven, Belgium.
| | - Bruno Ramos-Molina
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven, Belgium; Institute of Biomedical Research in Malaga (IBIMA), Virgen de la Victoria University Hospital, Malaga, Spain; Centro de Investigación Biomédica en Red (CIBER) Physiopathology of Obesity and Nutrition (CIBEROBN), Institute of Health Carlos III, Madrid, Spain
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26
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Adrianse RL, Smith K, Gatbonton-Schwager T, Sripathy SP, Lao U, Foss EJ, Boers RG, Boers JB, Gribnau J, Bedalov A. Perturbed maintenance of transcriptional repression on the inactive X-chromosome in the mouse brain after Xist deletion. Epigenetics Chromatin 2018; 11:50. [PMID: 30170615 PMCID: PMC6118007 DOI: 10.1186/s13072-018-0219-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 08/16/2018] [Indexed: 01/22/2023] Open
Abstract
Background The long noncoding RNA Xist is critical for initiation and establishment of X-chromosome inactivation during embryogenesis in mammals, but it is unclear whether its continued expression is required for maintaining X-inactivation in vivo. Results By using an inactive X-chromosome-linked MeCP2-GFP reporter, which allowed us to enumerate reactivation events in the mouse brain even when they occur in very few cells, we found that deletion of Xist in the brain after establishment of X-chromosome inactivation leads to reactivation in 2–5% of neurons and in a smaller fraction of astrocytes. In contrast to global loss of both H3 lysine 27 trimethylation (H3K27m3) and histone H2A lysine 119 monoubiquitylation (H2AK119ub1) we observed upon Xist deletion, alterations in CpG methylation were subtle, and this was mirrored by only minor alterations in X-chromosome-wide gene expression levels, with highly expressed genes more prone to both derepression and demethylation compared to genes with low expression level. Conclusion Our results demonstrate that Xist plays a role in the maintenance of histone repressive marks, DNA methylation and transcriptional repression on the inactive X-chromosome, but that partial loss of X-dosage compensation in the absence of Xist in the brain is well tolerated. Electronic supplementary material The online version of this article (10.1186/s13072-018-0219-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Robin L Adrianse
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N., Seattle, WA, 98109, USA
| | - Kaleb Smith
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N., Seattle, WA, 98109, USA
| | - Tonibelle Gatbonton-Schwager
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N., Seattle, WA, 98109, USA
| | - Smitha P Sripathy
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N., Seattle, WA, 98109, USA
| | - Uyen Lao
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N., Seattle, WA, 98109, USA
| | - Eric J Foss
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N., Seattle, WA, 98109, USA
| | - Ruben G Boers
- Department of Developmental Biology, Erasmus MC, 3015 CN, Rotterdam, The Netherlands.,Department of Obstetrics and Gynaecology, Erasmus MC, 3015 CN, Rotterdam, The Netherlands
| | - Joachim B Boers
- Department of Developmental Biology, Erasmus MC, 3015 CN, Rotterdam, The Netherlands.,Delft Diagnostic Laboratories, 2288 ER, Rijswijk, The Netherlands
| | - Joost Gribnau
- Department of Developmental Biology, Erasmus MC, 3015 CN, Rotterdam, The Netherlands
| | - Antonio Bedalov
- Clinical Research Division, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N., Seattle, WA, 98109, USA. .,Department of Biochemistry, University of Washington, Seattle, WA, 98195, USA. .,Department of Medicine, University of Washington, Seattle, WA, 98195, USA.
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27
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A mouse model of autism implicates endosome pH in the regulation of presynaptic calcium entry. Nat Commun 2018; 9:330. [PMID: 29362376 PMCID: PMC5780507 DOI: 10.1038/s41467-017-02716-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 12/19/2017] [Indexed: 11/21/2022] Open
Abstract
Psychoactive compounds such as chloroquine and amphetamine act by dissipating the pH gradient across intracellular membranes, but the physiological mechanisms that normally regulate organelle pH remain poorly understood. Interestingly, recent human genetic studies have implicated the endosomal Na+/H+ exchanger NHE9 in both autism spectrum disorders (ASD) and attention deficit hyperactivity disorder (ADHD). Plasma membrane NHEs regulate cytosolic pH, but the role of intracellular isoforms has remained unclear. We now find that inactivation of NHE9 in mice reproduces behavioral features of ASD including impaired social interaction, repetitive behaviors, and altered sensory processing. Physiological characterization reveals hyperacidic endosomes, a cell-autonomous defect in glutamate receptor expression and impaired neurotransmitter release due to a defect in presynaptic Ca2+ entry. Acute inhibition of synaptic vesicle acidification rescues release but without affecting the primary defect due to loss of NHE9. The Na+/H+ exchanger NHE9 is proposed to regulate the H+ electrochemical gradient across endosomal membranes. Here, the authors find that NHE9 knockout mice show autism spectrum disorder-like behaviors and disrupted synaptic vesicle exocytosis due to impaired presynaptic calcium entry.
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28
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A mixed modality approach towards Xi reactivation for Rett syndrome and other X-linked disorders. Proc Natl Acad Sci U S A 2017; 115:E668-E675. [PMID: 29282321 DOI: 10.1073/pnas.1715124115] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The X-chromosome harbors hundreds of disease genes whose associated diseases predominantly affect males. However, a subset, including neurodevelopmental disorders, Rett syndrome (RTT), fragile X syndrome, and CDKL5 syndrome, also affects females. These disorders lack disease-specific treatment. Because female cells carry two X chromosomes, an emerging treatment strategy has been to reawaken the healthy allele on the inactive X (Xi). Here, we focus on methyl-CpG binding protein 2 (MECP2) restoration for RTT and combinatorially target factors in the interactome of Xist, the noncoding RNA responsible for X inactivation. We identify a mixed modality approach combining an Xist antisense oligonucleotide and a small-molecule inhibitor of DNA methylation, which, together, achieve 30,000-fold MECP2 up-regulation from the Xi in cultured cells. Combining a brain-specific genetic Xist ablation with short-term 5-aza-2'-deoxycytidine (Aza) treatment models the synergy in vivo without evident toxicity. The Xi is selectively reactivated. These experiments provide proof of concept for a mixed modality approach for treating X-linked disorders in females.
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29
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Encinas JM, Fitzsimons CP. Gene regulation in adult neural stem cells. Current challenges and possible applications. Adv Drug Deliv Rev 2017; 120:118-132. [PMID: 28751200 DOI: 10.1016/j.addr.2017.07.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 07/17/2017] [Accepted: 07/19/2017] [Indexed: 12/13/2022]
Abstract
Adult neural stem and progenitor cells (NSPCs) offer a unique opportunity for neural regeneration and niche modification in physiopathological conditions, harnessing the capability to modify from neuronal circuits to glial scar. Findings exposing the vast plasticity and potential of NSPCs have accumulated over the past years and we currently know that adult NSPCs can naturally give rise not only to neurons but also to astrocytes and reactive astrocytes, and eventually to oligodendrocytes through genetic manipulation. We can consider NSPCs as endogenous flexible tools to fight against neurodegenerative and neurological disorders and aging. In addition, NSPCs can be considered as active agents contributing to chronic brain alterations and as relevant cell populations to be preserved, so that their main function, neurogenesis, is not lost in damage or disease. Altogether we believe that learning to manipulate NSPC is essential to prevent, ameliorate or restore some of the cognitive deficits associated with brain disease and injury, and therefore should be considered as target for future therapeutic strategies. The first step to accomplish this goal is to target them specifically, by unveiling and understanding their unique markers and signaling pathways.
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Affiliation(s)
- Juan Manuel Encinas
- Achucarro Basque Center for Neuroscience, Bizkaia Science and Technology Park, 205, 48170 Zamudio, Spain; Ikerbasque, The Basque Science Foundation, María Díaz de Haro 3, 6(th) Floor, 48013 Bilbao, Spain; University of the Basque Country (UPV/EHU), Barrio Sarriena s/n, 48940 Leioa, Spain.
| | - Carlos P Fitzsimons
- Neuroscience Program, Swammerdam Institute for Life Sciences, Faculty of Sciences, University of Amsterdam, SciencePark 904, 1098XH Amsterdam, The Netherlands.
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30
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Jiang C, Lin WJ, Sadahiro M, Shin AC, Buettner C, Salton SR. Embryonic ablation of neuronal VGF increases energy expenditure and reduces body weight. Neuropeptides 2017; 64:75-83. [PMID: 28024880 PMCID: PMC5478485 DOI: 10.1016/j.npep.2016.12.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 12/02/2016] [Accepted: 12/14/2016] [Indexed: 10/20/2022]
Abstract
Germline ablation of VGF, a secreted neuronal, neuroendocrine, and endocrine peptide precursor, results in lean, hypermetabolic, and infertile adult mice that are resistant to diet-, lesion-, and genetically-induced obesity and diabetes (Hahm et al., 1999, 2002). To assess whether this phenotype is predominantly driven by reduced VGF expression in developing and/or adult neurons, or in peripheral endocrine and neuroendocrine tissues, we generated and analyzed conditional VGF knockout mice, obtained by mating loxP-flanked (floxed) Vgf mice with either pan-neuronal Synapsin-Cre- or forebrain alpha-CaMKII-Cre-recombinase-expressing transgenic mice. Adult male and female mice, with conditional ablation of the Vgf gene in embryonic neurons had significantly reduced body weight, increased energy expenditure, and were resistant to diet-induced obesity. Conditional forebrain postnatal ablation of VGF in male mice, primarily in adult excitatory neurons, had no measurable effect on body weight nor on energy expenditure, but led to a modest increase in adiposity, partially overlapping the effect of AAV-Cre-mediated targeted ablation of VGF in the adult ventromedial hypothalamus and arcuate nucleus of floxed Vgf mice (Foglesong et al., 2016), and also consistent with results of icv delivery of the VGF-derived peptide TLQP-21 to adult mice, which resulted in increased energy expenditure and reduced adiposity (Bartolomucci et al., 2006). Because the lean, hypermetabolic phenotype of germline VGF knockout mice is to a great extent recapitulated in Syn-Cre+/-,Vgfflpflox/flpflox mice, we conclude that the metabolic profile of germline VGF knockout mice is largely the result of VGF ablation in embryonic CNS neurons, rather than peripheral endocrine and/or neuroendocrine cells, and that in forebrain structures such as hypothalamus, VGF and/or VGF-derived peptides play uniquely different roles in the developing and adult nervous system.
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Affiliation(s)
- Cheng Jiang
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA; Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA.
| | - Wei-Jye Lin
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA.
| | - Masato Sadahiro
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA; Graduate School of Biomedical Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA.
| | - Andrew C Shin
- Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA.
| | - Christoph Buettner
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA; Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA.
| | - Stephen R Salton
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA; Department of Geriatrics, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA; Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029-6574, USA.
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31
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Carreno G, Gonzalez-Meljem JM, Haston S, Martinez-Barbera JP. Stem cells and their role in pituitary tumorigenesis. Mol Cell Endocrinol 2017; 445:27-34. [PMID: 27720895 DOI: 10.1016/j.mce.2016.10.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/27/2016] [Accepted: 10/05/2016] [Indexed: 12/17/2022]
Abstract
The presence of adult pituitary stem cells (PSCs) has been described in murine systems by comprehensive cellular profiling and genetic lineage tracing experiments. PSCs are thought to maintain multipotent capacity throughout life and give rise to all hormone-producing cell lineages, playing a role in pituitary gland homeostasis. Additionally, PSCs have been proposed to play a role in pituitary tumorigenesis, in both adenomas and adamantinomatous craniopharyngiomas. In this manuscript, we discuss the different approaches used to demonstrate the presence of PSCs in the murine adult pituitary, from marker analyses to genetic tracing. In addition, we review the published literature suggesting the existence of tumor stem cells in mouse and human pituitary tumors. Finally, we discuss the potential role of PSCs in pituitary tumorigenesis in the context of current models of carcinogenesis and present evidence showing that in contrast to pituitary adenoma, which follows a classical cancer stem cell paradigm, a novel mechanism has been revealed for paracrine, non-cell autonomous tumor initiation in adamantinomatous craniopharyngioma, a benign but clinically aggressive pediatric tumor.
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Affiliation(s)
- Gabriela Carreno
- Developmental Biology and Cancer Program, Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| | - Jose Mario Gonzalez-Meljem
- Developmental Biology and Cancer Program, Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| | - Scott Haston
- Developmental Biology and Cancer Program, Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom
| | - Juan Pedro Martinez-Barbera
- Developmental Biology and Cancer Program, Birth Defects Research Centre, Institute of Child Health, University College London, London, United Kingdom.
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32
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Reno CM, Puente EC, Sheng Z, Daphna-Iken D, Bree AJ, Routh VH, Kahn BB, Fisher SJ. Brain GLUT4 Knockout Mice Have Impaired Glucose Tolerance, Decreased Insulin Sensitivity, and Impaired Hypoglycemic Counterregulation. Diabetes 2017; 66:587-597. [PMID: 27797912 PMCID: PMC5319720 DOI: 10.2337/db16-0917] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 10/12/2016] [Indexed: 12/12/2022]
Abstract
GLUT4 in muscle and adipose tissue is important in maintaining glucose homeostasis. However, the role of insulin-responsive GLUT4 in the central nervous system has not been well characterized. To assess its importance, a selective knockout of brain GLUT4 (BG4KO) was generated by crossing Nestin-Cre mice with GLUT4-floxed mice. BG4KO mice had a 99% reduction in GLUT4 protein expression throughout the brain. Despite normal feeding and fasting glycemia, BG4KO mice were glucose intolerant, demonstrated hepatic insulin resistance, and had reduced glucose uptake in the brain. In response to hypoglycemia, BG4KO mice had impaired glucose sensing, noted by impaired epinephrine and glucagon responses and impaired c-fos activation in the hypothalamic paraventricular nucleus. Moreover, in vitro glucose sensing of glucose-inhibitory neurons from the ventromedial hypothalamus was impaired in BG4KO mice. In summary, BG4KO mice are glucose intolerant, insulin resistant, and have impaired glucose sensing, indicating a critical role for brain GLUT4 in sensing and responding to changes in blood glucose.
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Affiliation(s)
- Candace M Reno
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University in St. Louis, St. Louis, MO
- Division of Endocrinology, Metabolism, and Diabetes, Department of Internal Medicine, University of Utah, Salt Lake City, UT
| | - Erwin C Puente
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University in St. Louis, St. Louis, MO
| | - Zhenyu Sheng
- Department of Pharmacology and Physiology, Rutgers New Jersey Medical School, Newark, NJ
| | - Dorit Daphna-Iken
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University in St. Louis, St. Louis, MO
| | - Adam J Bree
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University in St. Louis, St. Louis, MO
| | - Vanessa H Routh
- Department of Pharmacology and Physiology, Rutgers New Jersey Medical School, Newark, NJ
| | - Barbara B Kahn
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA
| | - Simon J Fisher
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University in St. Louis, St. Louis, MO
- Division of Endocrinology, Metabolism, and Diabetes, Department of Internal Medicine, University of Utah, Salt Lake City, UT
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33
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Stump M, Guo DF, Lu KT, Mukohda M, Cassell MD, Norris AW, Rahmouni K, Sigmund CD. Nervous System Expression of PPARγ and Mutant PPARγ Has Profound Effects on Metabolic Regulation and Brain Development. Endocrinology 2016; 157:4266-4275. [PMID: 27575030 PMCID: PMC5086539 DOI: 10.1210/en.2016-1524] [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: 01/28/2023]
Abstract
Peroxisome proliferator activated receptor (PPARγ) is a nuclear receptor transcription factor that regulates adipogenesis and energy homeostasis. Recent studies suggest PPARγ may mediate some of its metabolic effects through actions in the brain. We used a Cre-recombinase-dependent (using NestinCre) conditionally activatable transgene expressing either wild-type (WT) or dominant-negative (P467L) PPARγ to examine mechanisms by which PPARγ in the nervous system controls energy balance. Inducible expression of PPARγ was evident throughout the brain. Expression of 2 PPARγ target genes, aP2 and CD36, was induced by WT but not P467L PPARγ in the brain. Surprisingly, NesCre/PPARγ-WT mice exhibited severe microcephaly and brain malformation, suggesting that PPARγ can modulate brain development. On the contrary, NesCre/PPARγ-P467L mice exhibited blunted weight gain to high-fat diet, which correlated with a decrease in lean mass and tissue masses, accompanied by elevated plasma GH, and depressed plasma IGF-1, indicative of GH resistance. There was no expression of the transgene in the pancreas but both fasting plasma glucose, and fed and fasted plasma insulin levels were markedly decreased. NesCre/PPARγ-P467L mice fed either control diet or high-fat diet displayed impaired glucose tolerance yet exhibited increased sensitivity to exogenous insulin and increased insulin receptor signaling in white adipose tissue, liver, and skeletal muscle. These observations support the concept that alterations in PPARγ-driven mechanisms in the nervous system play a role in the regulation of growth and glucose metabolic homeostasis.
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Affiliation(s)
- Madeliene Stump
- Medical Scientist Training Program (M.S., K.R., C.D.S.); Neuroscience Graduate Program (M.S.); Departments of Pharmacology (D.-F.G., K.-T.L., M.M., K.R., C.D.S.), Anatomy and Cell Biology (M.D.C.), and Pediatrics (A.W.N.); and University of Iowa Healthcare Center for Hypertension Research (K.R., C.D.S.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242
| | - Deng-Fu Guo
- Medical Scientist Training Program (M.S., K.R., C.D.S.); Neuroscience Graduate Program (M.S.); Departments of Pharmacology (D.-F.G., K.-T.L., M.M., K.R., C.D.S.), Anatomy and Cell Biology (M.D.C.), and Pediatrics (A.W.N.); and University of Iowa Healthcare Center for Hypertension Research (K.R., C.D.S.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242
| | - Ko-Ting Lu
- Medical Scientist Training Program (M.S., K.R., C.D.S.); Neuroscience Graduate Program (M.S.); Departments of Pharmacology (D.-F.G., K.-T.L., M.M., K.R., C.D.S.), Anatomy and Cell Biology (M.D.C.), and Pediatrics (A.W.N.); and University of Iowa Healthcare Center for Hypertension Research (K.R., C.D.S.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242
| | - Masashi Mukohda
- Medical Scientist Training Program (M.S., K.R., C.D.S.); Neuroscience Graduate Program (M.S.); Departments of Pharmacology (D.-F.G., K.-T.L., M.M., K.R., C.D.S.), Anatomy and Cell Biology (M.D.C.), and Pediatrics (A.W.N.); and University of Iowa Healthcare Center for Hypertension Research (K.R., C.D.S.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242
| | - Martin D Cassell
- Medical Scientist Training Program (M.S., K.R., C.D.S.); Neuroscience Graduate Program (M.S.); Departments of Pharmacology (D.-F.G., K.-T.L., M.M., K.R., C.D.S.), Anatomy and Cell Biology (M.D.C.), and Pediatrics (A.W.N.); and University of Iowa Healthcare Center for Hypertension Research (K.R., C.D.S.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242
| | - Andrew W Norris
- Medical Scientist Training Program (M.S., K.R., C.D.S.); Neuroscience Graduate Program (M.S.); Departments of Pharmacology (D.-F.G., K.-T.L., M.M., K.R., C.D.S.), Anatomy and Cell Biology (M.D.C.), and Pediatrics (A.W.N.); and University of Iowa Healthcare Center for Hypertension Research (K.R., C.D.S.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242
| | - Kamal Rahmouni
- Medical Scientist Training Program (M.S., K.R., C.D.S.); Neuroscience Graduate Program (M.S.); Departments of Pharmacology (D.-F.G., K.-T.L., M.M., K.R., C.D.S.), Anatomy and Cell Biology (M.D.C.), and Pediatrics (A.W.N.); and University of Iowa Healthcare Center for Hypertension Research (K.R., C.D.S.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242
| | - Curt D Sigmund
- Medical Scientist Training Program (M.S., K.R., C.D.S.); Neuroscience Graduate Program (M.S.); Departments of Pharmacology (D.-F.G., K.-T.L., M.M., K.R., C.D.S.), Anatomy and Cell Biology (M.D.C.), and Pediatrics (A.W.N.); and University of Iowa Healthcare Center for Hypertension Research (K.R., C.D.S.), Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242
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Yamashita Y, Yamada-Goto N, Katsuura G, Ochi Y, Kanai Y, Miyazaki Y, Kuwahara K, Kanamoto N, Miura M, Yasoda A, Ohinata K, Inagaki N, Nakao K. Brain-specific natriuretic peptide receptor-B deletion attenuates high-fat diet-induced visceral and hepatic lipid deposition in mice. Peptides 2016; 81:38-50. [PMID: 27020246 DOI: 10.1016/j.peptides.2016.03.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 03/16/2016] [Accepted: 03/23/2016] [Indexed: 12/19/2022]
Abstract
C-type natriuretic peptide (CNP) and its receptor, natriuretic peptide receptor-B (NPR-B), are abundantly distributed in the hypothalamus. To explore the role of central CNP/NPR-B signaling in energy regulation, we generated mice with brain-specific NPR-B deletion (BND mice) by crossing Nestin-Cre transgenic mice and mice with a loxP-flanked NPR-B locus. Brain-specific NPR-B deletion prevented body weight gain induced by a high-fat diet (HFD), and the mesenteric fat and liver weights were significantly decreased in BND mice fed an HFD. The decreased liver weight in BND mice was attributed to decreased lipid accumulation in the liver, which was confirmed by histologic findings and lipid content. Gene expression analysis revealed a significant decrease in the mRNA expression levels of CD36, Fsp27, and Mogat1 in the liver of BND mice, and uncoupling protein 2 mRNA expression was significantly lower in the mesenteric fat of BND mice fed an HFD than in that of control mice. This difference was not observed in the epididymal or subcutaneous fat. Although previous studies reported that CNP/NPR-B signaling inhibits SNS activity in rodents, SNS is unlikely to be the underlying mechanism of the metabolic phenotype observed in BND mice. Taken together, CNP/NPR-B signaling in the brain could be a central factor that regulates visceral lipid accumulation and hepatic steatosis under HFD conditions. Further analyses of the precise mechanisms will enhance our understanding of the contribution of the CNP/NPR-B system to energy regulation.
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Affiliation(s)
- Yui Yamashita
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, 54, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.
| | - Nobuko Yamada-Goto
- Division of Endocrinology, Metabolism and Nephrology, Department of Internal Medicine, Keio University, School of Medicine, 35, Shinano-machi, Shinjyuku-ku, Tokyo 160-8582, Japan.
| | - Goro Katsuura
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, 54, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Yukari Ochi
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, 54, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Yugo Kanai
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, 54, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Yuri Miyazaki
- Division of Food Science and Biotechnology, Kyoto University Graduate School of Agriculture, Gokasyo, Uji-shi, Kyoto 611-0011, Japan
| | - Koichiro Kuwahara
- Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Naotetsu Kanamoto
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, 54, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Masako Miura
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, 54, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Akihiro Yasoda
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, 54, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Kousaku Ohinata
- Division of Food Science and Biotechnology, Kyoto University Graduate School of Agriculture, Gokasyo, Uji-shi, Kyoto 611-0011, Japan
| | - Nobuya Inagaki
- Department of Diabetes, Endocrinology and Nutrition, Kyoto University Graduate School of Medicine, 54, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Kazuwa Nakao
- Kyoto University Graduate School of Medicine Medical Innovation Center, 53, Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
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35
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Cao D, Ma X, Cai J, Luan J, Liu AJ, Yang R, Cao Y, Zhu X, Zhang H, Chen YX, Shi Y, Shi GX, Zou D, Cao X, Grusby MJ, Xie Z, Zhang WJ. ZBTB20 is required for anterior pituitary development and lactotrope specification. Nat Commun 2016; 7:11121. [PMID: 27079169 PMCID: PMC4835541 DOI: 10.1038/ncomms11121] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 02/22/2016] [Indexed: 01/03/2023] Open
Abstract
The anterior pituitary harbours five distinct hormone-producing cell types, and their cellular differentiation is a highly regulated and coordinated process. Here we show that ZBTB20 is essential for anterior pituitary development and lactotrope specification in mice. In anterior pituitary, ZBTB20 is highly expressed by all the mature endocrine cell types, and to some less extent by somatolactotropes, the precursors of prolactin (PRL)-producing lactotropes. Disruption of Zbtb20 leads to anterior pituitary hypoplasia, hypopituitary dwarfism and a complete loss of mature lactotropes. In ZBTB20-null mice, although lactotrope lineage commitment is normally initiated, somatolactotropes exhibit profound defects in lineage specification and expansion. Furthermore, endogenous ZBTB20 protein binds to Prl promoter, and its knockdown decreases PRL expression and secretion in a lactotrope cell line MMQ. In addition, ZBTB20 overexpression enhances the transcriptional activity of Prl promoter in vitro. In conclusion, our findings point to ZBTB20 as a critical regulator of anterior pituitary development and lactotrope specification.
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Affiliation(s)
- Dongmei Cao
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Xianhua Ma
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Jiao Cai
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Jing Luan
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China.,Department of Pathophysiology, Dalian Medical University, 9 West Section, Lvshun South Road, Dalian, 116044, China
| | - An-Jun Liu
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China.,Department of Cell Biology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Rui Yang
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Yi Cao
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China.,Department of Endocrinology, Changhai Hospital, 168 Changhai Road, Shanghai 200433, China
| | - Xiaotong Zhu
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China.,Department of Pathophysiology, Dalian Medical University, 9 West Section, Lvshun South Road, Dalian, 116044, China
| | - Hai Zhang
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Yu-Xia Chen
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Yuguang Shi
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, 15355 Lambda Drive, San Antonio, Texas 78245, USA
| | - Guang-Xia Shi
- Department of Pathophysiology, Dalian Medical University, 9 West Section, Lvshun South Road, Dalian, 116044, China
| | - Dajin Zou
- Department of Endocrinology, Changhai Hospital, 168 Changhai Road, Shanghai 200433, China
| | - Xuetao Cao
- National Key Laboratory of Molecular Biology and Department of Immunology, Chinese Academy of Medical Sciences, 9 Dongdan Santiao, Beijing, 100005, China
| | - Michael J Grusby
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, 651 Huntington Avenue, Boston, Massachusetts, 02115, USA
| | - Zhifang Xie
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China.,Department of Cell Biology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
| | - Weiping J Zhang
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China
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36
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Lee HB, Sundberg BN, Sigafoos AN, Clark KJ. Genome Engineering with TALE and CRISPR Systems in Neuroscience. Front Genet 2016; 7:47. [PMID: 27092173 PMCID: PMC4821859 DOI: 10.3389/fgene.2016.00047] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 03/16/2016] [Indexed: 12/26/2022] Open
Abstract
Recent advancement in genome engineering technology is changing the landscape of biological research and providing neuroscientists with an opportunity to develop new methodologies to ask critical research questions. This advancement is highlighted by the increased use of programmable DNA-binding agents (PDBAs) such as transcription activator-like effector (TALE) and RNA-guided clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR associated (Cas) systems. These PDBAs fused or co-expressed with various effector domains allow precise modification of genomic sequences and gene expression levels. These technologies mirror and extend beyond classic gene targeting methods contributing to the development of novel tools for basic and clinical neuroscience. In this Review, we discuss the recent development in genome engineering and potential applications of this technology in the field of neuroscience.
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Affiliation(s)
- Han B Lee
- Neurobiology of Disease Graduate Program, Mayo Graduate School Rochester, MN, USA
| | - Brynn N Sundberg
- Department of Biochemistry and Molecular Biology, Mayo Clinic Rochester, MN, USA
| | - Ashley N Sigafoos
- Department of Biochemistry and Molecular Biology, Mayo Clinic Rochester, MN, USA
| | - Karl J Clark
- Neurobiology of Disease Graduate Program, Mayo Graduate SchoolRochester, MN, USA; Department of Biochemistry and Molecular Biology, Mayo ClinicRochester, MN, USA
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37
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Willems C, Vankelecom H. Pituitary cell differentiation from stem cells and other cells: toward restorative therapy for hypopituitarism? Regen Med 2015; 9:513-34. [PMID: 25159067 DOI: 10.2217/rme.14.19] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The pituitary gland, key regulator of our endocrine system, produces multiple hormones that steer essential physiological processes. Hence, deficient pituitary function (hypopituitarism) leads to severe disorders. Hypopituitarism can be caused by defective embryonic development, or by damage through tumor growth/resection and traumatic brain injury. Lifelong hormone replacement is needed but associated with significant side effects. It would be more desirable to restore pituitary tissue and function. Recently, we showed that the adult (mouse) pituitary holds regenerative capacity in which local stem cells are involved. Repair of deficient pituitary may therefore be achieved by activating these resident stem cells. Alternatively, pituitary dysfunction may be mended by cell (replacement) therapy. The hormonal cells to be transplanted could be obtained by (trans-)differentiating various kinds of stem cells or other cells. Here, we summarize the studies on pituitary cell regeneration and on (trans-)differentiation toward hormonal cells, and speculate on restorative therapies for pituitary deficiency.
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Affiliation(s)
- Christophe Willems
- Department of Development & Regeneration, Cluster Stem Cell Biology and Embryology, Research Unit of Stem Cell Research, University of Leuven (KU Leuven), Leuven, Belgium
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38
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Declercq J, Brouwers B, Pruniau VPEG, Stijnen P, de Faudeur G, Tuand K, Meulemans S, Serneels L, Schraenen A, Schuit F, Creemers JWM. Metabolic and Behavioural Phenotypes in Nestin-Cre Mice Are Caused by Hypothalamic Expression of Human Growth Hormone. PLoS One 2015; 10:e0135502. [PMID: 26275221 PMCID: PMC4537087 DOI: 10.1371/journal.pone.0135502] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 07/22/2015] [Indexed: 11/19/2022] Open
Abstract
The Nestin-Cre driver mouse line has mild hypopituitarism, reduced body weight, a metabolic phenotype and reduced anxiety. Although several causes have been suggested, a comprehensive explanation is still lacking. In this study we examined the molecular mechanisms leading to this compound phenotype. Upon generation of the Nestin-Cre mice, the human growth hormone (hGH) minigene was inserted downstream of the Cre recombinase to ensure efficient transgene expression. As a result, hGH is expressed in the hypothalamus. This results in the auto/paracrine activation of the GH receptor as demonstrated by the increased phosphorylation of signal transducer and activator of transcription 5 (STAT5) and reduced expression of growth hormone releasing hormone (Ghrh). Low Ghrh levels cause hypopituitarism consistent with the observed mouse growth hormone (mGH) deficiency. mGH deficiency caused reduced activation of the GH receptor and hence reduced phosphorylation of STAT5 in the liver. This led to decreased levels of hepatic Igf-1 mRNA and consequently postnatal growth retardation. Furthermore, genes involved in lipid uptake and synthesis, such as CD36 and very low-density lipoprotein receptor were upregulated, resulting in liver steatosis. In conclusion, this study demonstrates the unexpected expression of hGH in the hypothalamus of Nestin-Cre mice which is able to activate both the GH receptor and the prolactin receptor. Increased hypothalamic GH receptor signaling explains the observed hypopituitarism, reduced growth and metabolic phenotype of Nestin-Cre mice. Activation of either receptor is consistent with reduced anxiety.
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Affiliation(s)
- Jeroen Declercq
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven 3000, Belgium
| | - Bas Brouwers
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven 3000, Belgium
| | - Vincent P. E. G. Pruniau
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven 3000, Belgium
| | - Pieter Stijnen
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven 3000, Belgium
| | - Geoffroy de Faudeur
- Gene Expression Unit, Department of Cellular and Molecular Medicine, KU Leuven, Leuven 3000, Belgium
| | - Krizia Tuand
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven 3000, Belgium
| | - Sandra Meulemans
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven 3000, Belgium
| | - Lutgarde Serneels
- Laboratory for the Research of Degenerative Diseases, KU Leuven, Leuven 3000, Belgium
| | - Anica Schraenen
- Gene Expression Unit, Department of Cellular and Molecular Medicine, KU Leuven, Leuven 3000, Belgium
| | - Frans Schuit
- Gene Expression Unit, Department of Cellular and Molecular Medicine, KU Leuven, Leuven 3000, Belgium
| | - John W. M. Creemers
- Laboratory for Biochemical Neuroendocrinology, Department of Human Genetics, KU Leuven, Leuven 3000, Belgium
- * E-mail:
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39
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López M, Tena-Sempere M. Estrogens and the control of energy homeostasis: a brain perspective. Trends Endocrinol Metab 2015; 26:411-21. [PMID: 26126705 DOI: 10.1016/j.tem.2015.06.003] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 05/29/2015] [Accepted: 06/01/2015] [Indexed: 01/09/2023]
Abstract
Despite their prominent roles in the control of reproduction, estrogens pervade many other bodily functions. Key metabolic pathways display marked sexual differences, and estrogens are potent modulators of energy balance, as evidenced in extreme conditions of estrogen deficiency characterized by hyperphagia and decreased energy expenditure, and leading to obesity. Compelling evidence has recently demonstrated that, in addition to their peripheral effects, the actions of estrogens on energy homeostasis are exerted at central levels, to regulate almost every key aspect of metabolic homeostasis, from feeding to energy expenditure, to glucose and lipid metabolism. We review herein the state-of-the-art of the role of estrogens in the regulation of energy balance, with a focus on their central effects and modes of action.
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Affiliation(s)
- Miguel López
- Department of Physiology, Faculty of Medicine and CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, 14004 Cordoba, Spain.
| | - Manuel Tena-Sempere
- CIBER Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, 14004 Cordoba, Spain; Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Instituto Maimónides de Investigación Biomédica (IMIBIC)/Hospital Reina Sofía, 14004 Córdoba, Spain; FiDiPro Program, Department of Physiology, University of Turku, Kiinamyllynkatu 10, FIN-20520 Turku, Finland.
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40
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Garcia-Lavandeira M, Diaz-Rodriguez E, Bahar D, Garcia-Rendueles AR, Rodrigues JS, Dieguez C, Alvarez CV. Pituitary Cell Turnover: From Adult Stem Cell Recruitment through Differentiation to Death. Neuroendocrinology 2015; 101:175-92. [PMID: 25662152 DOI: 10.1159/000375502] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 01/23/2015] [Indexed: 11/19/2022]
Abstract
The recent demonstration using genetic tracing that in the adult pituitary stem cells are normally recruited from the niche in the marginal zone and differentiate into secretory cells in the adenopituitary has elegantly confirmed the proposal made when the pituitary stem cell niche was first discovered 5 years ago. Some of the early controversies have also been resolved. However, many questions remain, such as which are the markers that make a pituitary stem cell truly unique and the exact mechanisms that trigger recruitment from the niche. Little is known about the processes of commitment and differentiation once a stem cell has left the niche. Moreover, the acceptance that pituitary cells are renewed by stem cells implies the existence of regulated mechanisms of cell death in differentiated cells which must themselves be explained. The demonstration of an apoptotic pathway mediated by RET/caspase 3/Pit-1/Arf/p53 in normal somatotrophs is therefore an important step towards understanding how pituitary cell number is regulated. Further work will elucidate how the rates of the three processes of cell renewal, differentiation and apoptosis are balanced in tissue homeostasis after birth, but altered in pituitary hyperplasia in response to physiological stimuli such as puberty and lactation. Thus, we can aim to understand the mechanisms underlying human disease due to insufficient (hypopituitarism) or excess (pituitary tumor) cell numbers.
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Affiliation(s)
- Montserrat Garcia-Lavandeira
- Neoplasia and Endocrine Differentiation, Centre for Investigations in Medicine (CIMUS), Instituto de Investigaciones Sanitarias, School of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain
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41
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Giusti SA, Vercelli CA, Vogl AM, Kolarz AW, Pino NS, Deussing JM, Refojo D. Behavioral phenotyping of Nestin-Cre mice: implications for genetic mouse models of psychiatric disorders. J Psychiatr Res 2014; 55:87-95. [PMID: 24768109 DOI: 10.1016/j.jpsychires.2014.04.002] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 04/01/2014] [Indexed: 11/19/2022]
Abstract
Genetic mouse models based on the Cre-loxP system have been extensively used to explore the influence of specific gene deletions on different aspects of behavioral neurobiology. However, the interpretation of the effects attributed to the gene deletion might be obscured by potential side effects secondary to the Cre recombinase transgene insertion or Cre activity, usually neither controlled nor reported. Here, we performed a comprehensive behavioral analysis of endophenotypes of neuropsychiatric disorders in the extensively used Nestin(Cre) mouse line, commonly employed to restrict genetic modifications to the CNS. We observed no alterations in locomotion, general exploratory activity, learning and memory, sociability, startle response and sensorimotor gating. Although the overall response to stimuli triggering anxiety-like behaviors remained unaltered in Nestin(Cre) mice, a strong impairment in the acquisition of both contextual- and cued-conditioned fear was observed. These results underline the importance of adequately controlling the behavioral performance of the employed Cre-lines per-se in pre-clinical neurobehavioral research.
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Affiliation(s)
- Sebastian A Giusti
- Molecular Neurobiology, Max Planck Institute of Psychiatry, Munich, Germany
| | - Claudia A Vercelli
- Instituto de Investigación en Biomedicina de Buenos Aires (IBioBA)-CONICET-Partner Institute of the Max Planck Society, Buenos Aires, Argentina
| | - Annette M Vogl
- Molecular Neurobiology, Max Planck Institute of Psychiatry, Munich, Germany
| | - Adam W Kolarz
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Munich, Germany
| | - Natalia S Pino
- Molecular Neurobiology, Max Planck Institute of Psychiatry, Munich, Germany
| | - Jan M Deussing
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Munich, Germany
| | - Damian Refojo
- Molecular Neurobiology, Max Planck Institute of Psychiatry, Munich, Germany.
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Girardet C, Begriche K, Ptitsyn A, Koza RA, Butler AA. Unravelling the mysterious roles of melanocortin-3 receptors in metabolic homeostasis and obesity using mouse genetics. INTERNATIONAL JOURNAL OF OBESITY SUPPLEMENTS 2014; 4:S37-44. [PMID: 27152165 DOI: 10.1038/ijosup.2014.10] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The central nervous melanocortin system maintains body mass and adiposity within a 'healthy' range by regulating satiety and metabolic homeostasis. Neural melanocortin-4 receptors (MC4R) modulate satiety signals and regulate autonomic outputs governing glucose and lipid metabolism in the periphery. The functions of melanocortin-3 receptors (MC3R) have been less well defined. We have observed that food anticipatory activity (FAA) is attenuated in Mc3r-/- mice housed in light:dark or constant dark conditions. Mc3r-/- mice subjected to the restricted feeding protocol that was used to induce FAA also developed insulin resistance, dyslipidaemia, impaired glucose tolerance and evidence of a cellular stress response in the liver. MC3Rs may thus function as modulators of oscillator systems that govern circadian rhythms, integrating signals from nutrient sensors to facilitate synchronizing peak foraging behaviour and metabolic efficiency with nutrient availability. To dissect the functions of MC3Rs expressed in hypothalamic and extra-hypothalamic structures, we inserted a 'lox-stop-lox' (TB) sequence into the Mc3r gene. Mc3r (TB/TB) mice recapitulate the phenotype reported for Mc3r-/- mice: increased adiposity, accelerated diet-induced obesity and attenuated FAA. The ventromedial hypothalamus exhibits high levels of Mc3r expression; however, restoring the expression of the LoxTB Mc3r allele in this nucleus did not restore FAA. However, a surprising outcome came from studies using Nestin-Cre to restore the expression of the LoxTB Mc3r allele in the nervous system. These data suggest that 'non-neural' MC3Rs have a role in the defence of body weight. Future studies examining the homeostatic functions of MC3Rs should therefore consider actions outside the central nervous system.
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Affiliation(s)
- C Girardet
- Department of Metabolism and Aging, The Scripps Research Institute , Jupiter, FL, USA
| | - K Begriche
- Department of Metabolism and Aging, The Scripps Research Institute , Jupiter, FL, USA
| | - A Ptitsyn
- The Pennington Biomedical Research Center, Louisiana State University System , Baton Rouge, LA, USA
| | - R A Koza
- The Pennington Biomedical Research Center, Louisiana State University System , Baton Rouge, LA, USA
| | - A A Butler
- Department of Metabolism and Aging, The Scripps Research Institute , Jupiter, FL, USA
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Pedroso JAB, Buonfiglio DC, Cardinali LI, Furigo IC, Ramos-Lobo AM, Tirapegui J, Elias CF, Donato J. Inactivation of SOCS3 in leptin receptor-expressing cells protects mice from diet-induced insulin resistance but does not prevent obesity. Mol Metab 2014; 3:608-18. [PMID: 25161884 PMCID: PMC4142399 DOI: 10.1016/j.molmet.2014.06.001] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 05/29/2014] [Accepted: 06/03/2014] [Indexed: 02/05/2023] Open
Abstract
Therapies that improve leptin sensitivity have potential as an alternative treatment approach against obesity and related comorbidities. We investigated the effects of Socs3 gene ablation in different mouse models to understand the role of SOCS3 in the regulation of leptin sensitivity, diet-induced obesity (DIO) and glucose homeostasis. Neuronal deletion of SOCS3 partially prevented DIO and improved glucose homeostasis. Inactivation of SOCS3 only in LepR-expressing cells protected against leptin resistance induced by HFD, but did not prevent DIO. However, inactivation of SOCS3 in LepR-expressing cells protected mice from diet-induced insulin resistance by increasing hypothalamic expression of Katp channel subunits and c-Fos expression in POMC neurons. In summary, the regulation of leptin signaling by SOCS3 orchestrates diet-induced changes on glycemic control. These findings help to understand the molecular mechanisms linking obesity and type 2 diabetes, and highlight the potential of SOCS3 inhibitors as a promising therapeutic approach for the treatment of diabetes.
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Key Words
- AP, area postrema
- ARH, arcuate nucleus of the hypothalamus
- DIO, diet-induced obesity
- DMV, dorsal motor nucleus of the vagus
- GTT, glucose tolerance test
- HFD, high-fat diet
- High-fat diet
- Hypothalamus
- ITT, insulin tolerance test
- KO, knockout
- LepR, leptin receptor
- Leptin resistance
- NTS, nucleus of the solitary tract
- PI3K, phosphatidylinositol 3-kinase
- PKC, protein kinase C
- POMC
- POMC, proopiomelanocortin
- PTPs, protein-tyrosine phosphatases
- SOCS3, suppressor of cytokine signaling-3
- Suppressor of cytokine signaling-3
- T2DM, type 2 diabetes mellitus
- Type 2 diabetes mellitus
- VMH, ventromedial nucleus of the hypothalamus
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Affiliation(s)
- João A B Pedroso
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Daniella C Buonfiglio
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Lais I Cardinali
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Isadora C Furigo
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Angela M Ramos-Lobo
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Julio Tirapegui
- Department of Food Science and Experimental Nutrition, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil
| | - Carol F Elias
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA ; Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI, USA ; Department of Internal Medicine, Division of Hypothalamic Research, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Jose Donato
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
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Vankelecom H, Chen J. Pituitary stem cells: where do we stand? Mol Cell Endocrinol 2014; 385:2-17. [PMID: 23994027 DOI: 10.1016/j.mce.2013.08.018] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Revised: 08/12/2013] [Accepted: 08/20/2013] [Indexed: 01/21/2023]
Abstract
Some 5 years ago, the stem cells of the adult pituitary gland were discovered. Subsequent in-depth characterization revealed expression of several stemness markers and embryo-typical factors. Now, the quest is open to decipher their role in the gland. When and how pituitary stem cells differentiate to contribute to the mature hormone-producing cell populations is not known. New research models support their involvement in cell regeneration after injury in the gland, and suggest a possible role in pituitary tumor formation. From their expression phenotype, pituitary stem cells seem to re-use embryonic developmental programs during the creation of new hormonal cells. Here, we will review the latest progression in the domain of pituitary stem cells, including the uncovering of some new molecular flavors and of the first potential functions. Eventually, we will speculate on their differentiation programs towards hormonal cells, with a particular focus on gonadotropes.
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Affiliation(s)
- Hugo Vankelecom
- Department of Development and Regeneration, Cluster Stem Cell Biology and Embryology, Research Unit of Stem Cell Research, University of Leuven (KU Leuven), B-3000 Leuven, Belgium.
| | - Jianghai Chen
- Department of Hand Surgery, Tongji Medical College, Union Hospital, Huazhong University of Science & Technology (HUST), Wuhan, Hubei 430022, PR China.
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45
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Hess ME, Brüning JC. The fat mass and obesity-associated (FTO) gene: Obesity and beyond? Biochim Biophys Acta Mol Basis Dis 2014; 1842:2039-47. [PMID: 24518103 DOI: 10.1016/j.bbadis.2014.01.017] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 01/22/2014] [Indexed: 12/11/2022]
Abstract
Genome wide association studies undoubtedly linked variants of the fat mass and obesity-associated protein (FTO) to obesity. To date, however, knowledge on the mechanisms coupling variants in the intron of the FTO gene to its expression or enzymatic activity to alter metabolism remains scarce. Until recently, the investigation of the molecular function of FTO had not led to conclusive results concerning the 'where', 'when' and 'how' of FTO activity. Finally, since FTO was identified as a RNA modifying enzyme, demethylating N6-methyladenosine on single stranded RNA, novel understanding of the molecular function is gathered. These and other studies suggest the requirement for a further reaching approach to further investigate FTO function, since the phenotype of aberrant FTO function may encompass more than just obesity. Taking these new insights and translating them into appropriate paradigms for functional research in humans may lead to a deeper understanding of the human physiology and disease. This article is part of a Special Issue entitled: From Genome to Function.
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Affiliation(s)
- Martin E Hess
- Max Planck Institute for Neurological Research, D-50931 Cologne, Germany; Department of Mouse Genetics and Metabolism, Institute for Genetics, Center of Molecular Medicine Cologne (CMMC), D-50674 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), D-50931 Cologne, Germany; Center for Endocrinology, Diabetes and Preventive Medicine (CEDP), University Hospital of Cologne, D-50931 Cologne, Germany
| | - Jens C Brüning
- Max Planck Institute for Neurological Research, D-50931 Cologne, Germany; Department of Mouse Genetics and Metabolism, Institute for Genetics, Center of Molecular Medicine Cologne (CMMC), D-50674 Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), D-50931 Cologne, Germany; Center for Endocrinology, Diabetes and Preventive Medicine (CEDP), University Hospital of Cologne, D-50931 Cologne, Germany.
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46
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van Rijn SJ, Tryfonidou MA, Hanson JM, Penning LC, Meij BP. Stem cells in the canine pituitary gland and in pituitary adenomas. Vet Q 2014; 33:217-24. [PMID: 24320563 DOI: 10.1080/01652176.2013.873961] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Cushing's disease (CD) or pituitary-dependent hypercortisolism is a common endocrinopathy in dogs, with an estimated prevalence of 1 or 2 in 1000 dogs per year. It is caused by an adrenocorticotropic hormone secreting adenoma in the pars distalis or pars intermedia of the pituitary gland. The pituitary gland is a small endocrine gland located in the pituitary fossa. In the postnatal individual, the hypothalamus-pituitary axis plays a central role in maintaining homeostatic functions, like control of metabolism, reproduction, and growth. Stem cells are suggested to play a role in the homeostatic adaptations of the adult pituitary gland, such as the rapid specific cell-type expansion in response to pregnancy or lactation. Several cell populations have been suggested as pituitary stem cells, such as Side Population cells and cells expressing Sox2 or Nestin. These cell populations are discussed in this review. Also, stem and progenitor cells are thought to play a role in pituitary tumorigenesis, such as the development of pituitary adenomas in dogs. There are limited reports on the role of stem cells in pituitary adenomas, especially in dogs. Further studies are needed to identify and characterize this cell population and to develop specific cell targeting therapeutic strategies as a new way of treating canine CD.
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Affiliation(s)
- Sarah J van Rijn
- a Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine , Utrecht University , PO Box 80154, 3508 TD , Utrecht , the Netherlands
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Yoshida S, Kato T, Higuchi M, Yako H, Chen M, Kanno N, Ueharu H, Kato Y. Rapid transition of NESTIN-expressing dividing cells from PROP1-positive to PIT1-positive advances prenatal pituitary development. J Neuroendocrinol 2013; 25:779-91. [PMID: 23855824 DOI: 10.1111/jne.12077] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 07/09/2013] [Accepted: 07/11/2013] [Indexed: 12/01/2022]
Abstract
We recently reported that the quantitative and qualitative transition of stem/progenitor cells occurs by the acquisition of a novel mechanism in the terminal differentiation during postnatal development of the anterior pituitary. We hypothesised that this novel mechanism is an alteration of a cell supply system accompanying proliferation of the progenitor cells. In the present study, we examined the proliferation activities of progenitor cells by indication of the expression of Nestin, a marker of rapidly dividing progenitor cells, aiming to verify our hypothesis and to resolve another outstanding issue regarding whether the Nestin gene is expressed in the pituitary. We found that NESTIN-positive dividing cells certainly exist in the pituitary through all stages of development. Almost all of the PROP1-positive progenitor cells express Nestin in early embryonic pituitary development. Thereafter, Nestin-expressing dividing cells involved in the cell supply system transfer from PROP1-positive progenitor cells to committed progenitor cells, such as PIT1-positive cells, on neonatal pituitary development. Furthermore, our data, together with the findings of previous studies on cell lineage tracing analyses using Nestin-Cre mice derived by the central nervous system (CNS)-specific Nestin promoter, suggest that at least two regulation systems for Nestin-expression exist in the pituitary, with the majority of these not being CNS-specific.
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Affiliation(s)
- S Yoshida
- Division of Life Science, Graduate School of Agriculture, Meiji University, Kanagawa, Japan
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48
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Abstract
Nestin-Cre mice have a significant metabolic phenotype that is hard to discern from current literature. Indeed, the Cre-lox system has numerous problems that can affect physiological parameters, and these are missed when the correct control strains are not used. Despite the increasing use of the Cre-lox system, these issues were not visible to the scientific community previously and may have affected published work. This makes it important to highlight the issues and raise awareness of the pitfalls of the Cre-lox system. Therefore, this perspective will discuss the impact of CNS and peripheral "off-target" Cre recombination on metabolic systems and describe the development of new approaches to obviate the difficulties.
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Affiliation(s)
- Erika Harno
- Neuroscience Research Group, Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK
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49
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Girardet C, Butler AA. Neural melanocortin receptors in obesity and related metabolic disorders. Biochim Biophys Acta Mol Basis Dis 2013; 1842:482-94. [PMID: 23680515 DOI: 10.1016/j.bbadis.2013.05.004] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 04/16/2013] [Accepted: 05/03/2013] [Indexed: 12/11/2022]
Abstract
Obesity is a global health issue, as it is associated with increased risk of developing chronic conditions associated with disorders of metabolism such as type 2 diabetes and cardiovascular disease. A better understanding of how excessive fat accumulation develops and causes diseases of the metabolic syndrome is urgently needed. The hypothalamic melanocortin system is an important point of convergence connecting signals of metabolic status with the neural circuitry that governs appetite and the autonomic and neuroendocrine system controling metabolism. This system has a critical role in the defense of body weight and maintenance of homeostasis. Two neural melanocortin receptors, melanocortin 3 and 4 receptors (MC3R and MC4R), play crucial roles in the regulation of energy balance. Mutations in the MC4R gene are the most common cause of monogenic obesity in humans, and a large literature indicates a role in regulating both energy intake through the control of satiety and energy expenditure. In contrast, MC3Rs have a more subtle role in energy homeostasis. Results from our lab indicate an important role for MC3Rs in synchronizing rhythms in foraging behavior with caloric cues and maintaining metabolic homeostasis during periods of nutrient scarcity. However, while deletion of the Mc3r gene in mice alters nutrient partitioning to favor accumulation of fat mass no obvious role for MC3R haploinsufficiency in human obesity has been reported. This article is part of a Special Issue entitled: Modulation of Adipose Tissue in Health and Disease.
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MESH Headings
- Animals
- Body Weight/genetics
- Cardiovascular Diseases/complications
- Cardiovascular Diseases/metabolism
- Cardiovascular Diseases/pathology
- Diabetes Mellitus, Type 2/complications
- Diabetes Mellitus, Type 2/metabolism
- Diabetes Mellitus, Type 2/pathology
- Humans
- Metabolic Diseases/genetics
- Metabolic Diseases/metabolism
- Metabolic Diseases/pathology
- Mice
- Obesity/complications
- Obesity/genetics
- Obesity/metabolism
- Obesity/pathology
- Receptor, Melanocortin, Type 3/genetics
- Receptor, Melanocortin, Type 3/metabolism
- Receptor, Melanocortin, Type 4/genetics
- Receptor, Melanocortin, Type 4/metabolism
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Affiliation(s)
- Clemence Girardet
- Department of Metabolism and Aging, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA
| | - Andrew A Butler
- Department of Metabolism and Aging, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA.
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50
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Karaca M, Maechler P. Development of Mice with Brain-Specific Deletion of Floxed Glud1 (Glutamate Dehydrogenase 1) Using Cre Recombinase Driven by the Nestin Promoter. Neurochem Res 2013; 39:456-9. [DOI: 10.1007/s11064-013-1041-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 04/08/2013] [Accepted: 04/09/2013] [Indexed: 12/20/2022]
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