1
|
Wang H, Newton G, Wu L, Lin LL, Miracco AS, Natesan S, Luscinskas FW. CD47 antibody blockade suppresses microglia-dependent phagocytosis and monocyte transition to macrophages, impairing recovery in EAE. JCI Insight 2021; 6:148719. [PMID: 34591795 PMCID: PMC8663579 DOI: 10.1172/jci.insight.148719] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 09/24/2021] [Indexed: 11/24/2022] Open
Abstract
Experimental autoimmune encephalomyelitis (EAE) is a well-characterized animal model of multiple sclerosis. During the early phase of EAE, infiltrating monocytes and monocyte-derived macrophages contribute to T cell recruitment, especially CD4+ T cells, into the CNS, resulting in neuronal demyelination; however, in later stages, they promote remyelination and recovery by removal of myelin debris by phagocytosis. Signal regulatory protein α and CD47 are abundantly expressed in the CNS, and deletion of either molecule is protective in myelin oligodendrocyte glycoprotein–induced EAE because of failed effector T cell expansion and trafficking. Here we report that treatment with the function blocking CD47 Ab Miap410 substantially reduced the infiltration of pathogenic immune cells but impaired recovery from paresis. The underlying mechanism was by blocking the emergence of CD11chiMHCIIhi microglia at peak disease that expressed receptors for phagocytosis, scavenging, and lipid catabolism, which mediated clearance of myelin debris and the transition of monocytes to macrophages in the CNS. In the recovery phase of EAE, Miap410 Ab–treated mice had worsening paresis with sustained inflammation and limited remyelination as compared with control Ab–treated mice. In summary, Ab blockade of CD47 impaired resolution of CNS inflammation, thus worsening EAE.
Collapse
Affiliation(s)
- Huan Wang
- Center for Excellence in Vascular Biology, Department of Pathology, Mass General Brigham and Harvard Medical School, Boston, Massachusetts, USA
| | - Gail Newton
- Center for Excellence in Vascular Biology, Department of Pathology, Mass General Brigham and Harvard Medical School, Boston, Massachusetts, USA
| | - Liguo Wu
- Immunology & Inflammation Research Therapeutic Area, Sanofi US, Cambridge, Massachusetts, USA
| | - Lih-Ling Lin
- Immunology & Inflammation Research Therapeutic Area, Sanofi US, Cambridge, Massachusetts, USA
| | - Amy S Miracco
- Immunology & Inflammation Research Therapeutic Area, Sanofi US, Cambridge, Massachusetts, USA
| | - Sridaran Natesan
- Immunology & Inflammation Research Therapeutic Area, Sanofi US, Cambridge, Massachusetts, USA
| | - Francis W Luscinskas
- Center for Excellence in Vascular Biology, Department of Pathology, Mass General Brigham and Harvard Medical School, Boston, Massachusetts, USA
| |
Collapse
|
2
|
Purakal J, Venkatesan S, Natesan S, Staton C, Kozhumam A, Vissoci J. 35 Prevalence and Predictors of Post-Traumatic Stress Disorder Symptoms Among Emergency Physicians in the United States During the COVID-19 Pandemic. Ann Emerg Med 2021. [DOI: 10.1016/j.annemergmed.2021.07.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
3
|
Sharun K, Jose B, Tiwari R, Natesan S, Dhama K. Biodetection dogs for COVID-19: an alternative diagnostic screening strategy. Public Health 2021; 197:e10-e12. [PMID: 33618893 PMCID: PMC7817409 DOI: 10.1016/j.puhe.2020.12.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 12/28/2020] [Indexed: 12/17/2022]
Affiliation(s)
- K Sharun
- Division of Surgery, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243 122, Uttar Pradesh, India.
| | - B Jose
- Division of Physiology & Climatology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243 122, Bareilly, Uttar Pradesh, India
| | - R Tiwari
- Department of Veterinary Microbiology and Immunology, College of Veterinary Sciences, Uttar Pradesh Pandit Deen Dayal Upadhyaya Pashu Chikitsa Vigyan Vishwavidyalaya Evam Go Anusandhan Sansthan (DUVASU), Mathura 281001, India
| | - S Natesan
- Department of Infectious Diseases, Indian Institute of Public Health Gandhinagar, Lekawada, Ganghinagar, Gujarat 382042, India
| | - K Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243 122, Uttar Pradesh, India.
| |
Collapse
|
4
|
Jauhar S, Veronese M, Rogdaki M, Bloomfield M, Natesan S, Turkheimer F, Kapur S, Howes OD. Regulation of dopaminergic function: an [ 18F]-DOPA PET apomorphine challenge study in humans. Transl Psychiatry 2017; 7:e1027. [PMID: 28170002 PMCID: PMC5438020 DOI: 10.1038/tp.2016.270] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 07/25/2016] [Accepted: 08/02/2016] [Indexed: 02/08/2023] Open
Abstract
Dopaminergic function has a key role in normal brain function, dopaminergic dysfunction being implicated in numerous neuropsychiatric disorders. Animal studies show that dopaminergic stimulation regulates dopaminergic function, but it is not known whether this exists in humans. In the first study (study 1), we measured dopamine synthesis capacity (indexed as Kicer) to identify the relationship between baseline and change in Kicer under resting conditions for comparison with effects of dopaminergic stimulation. In the second study (study 2), we used a within-subjects design to test effects of dopaminergic stimulation on dopamine synthesis capacity. In study 1, eight volunteers received two 18F-DOPA scans on separate days, both at rest. In study 2, 12 healthy male volunteers received two 18F-DOPA positron emission tomographic (PET) scans after treatment with either the dopamine partial agonist apomorphine (0.03 or 0.005 mg kg-1) or placebo. In study 1, no significant correlation was found between baseline and change in dopamine synthesis capacity between scans (r=-0.57, n=8, P=0.17, two-tailed). In study 2, a significant negative correlation was found between baseline dopamine synthesis capacity and percentage change in dopamine synthesis capacity after apomorphine challenge (r=-0.71, n=12, P=0.01, two-tailed). This correlation was significantly different (P<0.01) from the correlation between baseline and change in dopamine synthesis capacity under unstimulated conditions. One-way repeated-measures analysis of variance showed a significant group (study 1/study 2) × time interaction (F(1,18)=11.5, P=0.003). Our findings suggest that regulation of dopamine synthesis capacity by apomorphine depends on baseline dopamine function, consistent with dopamine stimulation stabilizing dopaminergic function. Loss of this autoregulation may contribute to dopaminergic dysfunction in brain disorders such as schizophrenia, substance dependence, and Parkinson's disease.
Collapse
Affiliation(s)
- S Jauhar
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - M Veronese
- Centre for Neuroimaging Sciences, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - M Rogdaki
- MRC London Institute of Medical Sciences, London, UK
| | - M Bloomfield
- MRC London Institute of Medical Sciences, London, UK
| | - S Natesan
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - F Turkheimer
- Centre for Neuroimaging Sciences, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - S Kapur
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - O D Howes
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK,MRC London Institute of Medical Sciences, London, UK,Institute of Clinical Sciences, Department of Medicine, Imperial College London, London, UK,Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College, Box 67, Camberwell, London SE5 8AF, UK. E-mail:
| |
Collapse
|
5
|
Crum WR, Danckaers F, Huysmans T, Cotel MC, Natesan S, Modo MM, Sijbers J, Williams SCR, Kapur S, Vernon AC. Chronic exposure to haloperidol and olanzapine leads to common and divergent shape changes in the rat hippocampus in the absence of grey-matter volume loss. Psychol Med 2016; 46:3081-3093. [PMID: 27516217 PMCID: PMC5108303 DOI: 10.1017/s0033291716001768] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 06/23/2016] [Accepted: 06/23/2016] [Indexed: 12/15/2022]
Abstract
BACKGROUND One of the most consistently reported brain abnormalities in schizophrenia (SCZ) is decreased volume and shape deformation of the hippocampus. However, the potential contribution of chronic antipsychotic medication exposure to these phenomena remains unclear. METHOD We examined the effect of chronic exposure (8 weeks) to clinically relevant doses of either haloperidol (HAL) or olanzapine (OLZ) on adult rat hippocampal volume and shape using ex vivo structural MRI with the brain retained inside the cranium to prevent distortions due to dissection, followed by tensor-based morphometry (TBM) and elastic surface-based shape deformation analysis. The volume of the hippocampus was also measured post-mortem from brain tissue sections in each group. RESULTS Chronic exposure to either HAL or OLZ had no effect on the volume of the hippocampus, even at exploratory thresholds, which was confirmed post-mortem. In contrast, shape deformation analysis revealed that chronic HAL and OLZ exposure lead to both common and divergent shape deformations (q = 0.05, FDR-corrected) in the rat hippocampus. In particular, in the dorsal hippocampus, HAL exposure led to inward shape deformation, whereas OLZ exposure led to outward shape deformation. Interestingly, outward shape deformations that were common to both drugs occurred in the ventral hippocampus. These effects remained significant after controlling for hippocampal volume suggesting true shape changes. CONCLUSIONS Chronic exposure to either HAL or OLZ leads to both common and divergent effects on rat hippocampal shape in the absence of volume change. The implications of these findings for the clinic are discussed.
Collapse
Affiliation(s)
- W. R. Crum
- Department of Neuroimaging,
King's College London, Institute of
Psychiatry, Psychology and Neuroscience,
Centre for Neuroimaging Sciences, De Crespigny
Park, London, UK
| | - F. Danckaers
- Department of Physics,
iMinds-Vision Laboratory, University of
Antwerp, Antwerp, Belgium
| | - T. Huysmans
- Department of Physics,
iMinds-Vision Laboratory, University of
Antwerp, Antwerp, Belgium
| | - M.-C. Cotel
- Department of Psychosis Studies,
King's College London, Institute of
Psychiatry, Psychology and Neuroscience, De
Crespigny Park, London, UK
| | - S. Natesan
- Department of Psychosis Studies,
King's College London, Institute of
Psychiatry, Psychology and Neuroscience, De
Crespigny Park, London, UK
| | - M. M. Modo
- Department of Basic and Clinical
Neuroscience, King's College London,
Institute of Psychiatry, Psychology and
Neuroscience, Maurice Wohl Institute for Clinical
Neuroscience, London, UK
| | - J. Sijbers
- Department of Physics,
iMinds-Vision Laboratory, University of
Antwerp, Antwerp, Belgium
| | - S. C. R. Williams
- Department of Neuroimaging,
King's College London, Institute of
Psychiatry, Psychology and Neuroscience,
Centre for Neuroimaging Sciences, De Crespigny
Park, London, UK
| | - S. Kapur
- Department of Psychosis Studies,
King's College London, Institute of
Psychiatry, Psychology and Neuroscience, De
Crespigny Park, London, UK
| | - A. C. Vernon
- Department of Psychosis Studies,
King's College London, Institute of
Psychiatry, Psychology and Neuroscience, De
Crespigny Park, London, UK
- Department of Basic and Clinical
Neuroscience, King's College London,
Institute of Psychiatry, Psychology and
Neuroscience, Maurice Wohl Institute for Clinical
Neuroscience, London, UK
| |
Collapse
|
6
|
Stewart SR, Barone PW, Bellisario A, Cooney CL, Sharp PA, Sinskey AJ, Natesan S, Springs SL. Leveraging Industry-Academia Collaborations in Adaptive Biomedical Innovation. Clin Pharmacol Ther 2016; 100:647-653. [PMID: 27617845 DOI: 10.1002/cpt.504] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 08/25/2016] [Indexed: 11/05/2022]
Abstract
Despite the rapid pace of biomedical innovation, research and development (R&D) productivity in the pharmaceutical industry has not improved broadly. Increasingly, firms need to leverage new approaches to product development and commercial execution, while maintaining adaptability to rapid changes in the marketplace and in biomedical science. Firms are also seeking ways to capture some of the talent, infrastructure, and innovation that depends on federal R&D investment. As a result, a major transition to external innovation is taking place across the industry. One example of these external innovation initiatives is the Sanofi-MIT Partnership, which provided seed funding to MIT investigators to develop novel solutions and approaches in areas of interest to Sanofi. These projects were highly collaborative, with information and materials flowing both ways. The relatively small amount of funding and short time frame of the awards built an adaptable and flexible process to advance translational science.
Collapse
Affiliation(s)
- S R Stewart
- Center for Biomedical Innovation, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - P W Barone
- Center for Biomedical Innovation, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - A Bellisario
- Technology Licensing Office, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - C L Cooney
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - P A Sharp
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - A J Sinskey
- Center for Biomedical Innovation, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.,Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - S Natesan
- Sanofi, Cambridge, Massachusetts, USA
| | - S L Springs
- Center for Biomedical Innovation, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| |
Collapse
|
7
|
Autelitano F, Loyaux D, Roudières S, Déon C, Guette F, Fabre P, Ping Q, Wang S, Auvergne R, Badarinarayana V, Smith M, Guillemot JC, Goldman SA, Natesan S, Ferrara P, August P. Identification of novel tumor-associated cell surface sialoglycoproteins in human glioblastoma tumors using quantitative proteomics. PLoS One 2014; 9:e110316. [PMID: 25360666 PMCID: PMC4216004 DOI: 10.1371/journal.pone.0110316] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 09/11/2014] [Indexed: 11/21/2022] Open
Abstract
Glioblastoma multiform (GBM) remains clinical indication with significant “unmet medical need”. Innovative new therapy to eliminate residual tumor cells and prevent tumor recurrences is critically needed for this deadly disease. A major challenge of GBM research has been the identification of novel molecular therapeutic targets and accurate diagnostic/prognostic biomarkers. Many of the current clinical therapeutic targets of immunotoxins and ligand-directed toxins for high-grade glioma (HGG) cells are surface sialylated glycoproteins. Therefore, methods that systematically and quantitatively analyze cell surface sialoglycoproteins in human clinical tumor samples would be useful for the identification of potential diagnostic markers and therapeutic targets for malignant gliomas. In this study, we used the bioorthogonal chemical reporter strategy (BOCR) in combination with label-free quantitative mass spectrometry (LFQ-MS) to characterize and accurately quantify the individual cell surface sialoproteome in human GBM tissues, in fetal, adult human astrocytes, and in human neural progenitor cells (NPCs). We identified and quantified a total of 843 proteins, including 801 glycoproteins. Among the 843 proteins, 606 (72%) are known cell surface or secreted glycoproteins, including 156 CD-antigens, all major classes of cell surface receptor proteins, transporters, and adhesion proteins. Our findings identified several known as well as new cell surface antigens whose expression is predominantly restricted to human GBM tumors as confirmed by microarray transcription profiling, quantitative RT-PCR and immunohistochemical staining. This report presents the comprehensive identification of new biomarkers and therapeutic targets for the treatment of malignant gliomas using quantitative sialoglycoproteomics with clinically relevant, patient derived primary glioma cells.
Collapse
Affiliation(s)
- François Autelitano
- Sanofi-Aventis Recherche & Développement, Centre de Toulouse, Toulouse, France
- * E-mail:
| | - Denis Loyaux
- Sanofi-Aventis Recherche & Développement, Centre de Toulouse, Toulouse, France
| | - Sébastien Roudières
- Sanofi-Aventis Recherche & Développement, Centre de Toulouse, Toulouse, France
| | - Catherine Déon
- Sanofi-Aventis Recherche & Développement, Centre de Toulouse, Toulouse, France
| | - Frédérique Guette
- Sanofi-Aventis Recherche & Développement, Centre de Toulouse, Toulouse, France
| | - Philippe Fabre
- Sanofi-Aventis Recherche & Développement, Centre de Toulouse, Toulouse, France
| | - Qinggong Ping
- ALS Therapy Development Institute, Cambridge, Massachusetts, United States of America
| | - Su Wang
- Department of Neurology, University of Rochester Medical Center, School of Medicine and Dentistry, Rochester, New York, United States of America
| | - Romane Auvergne
- Department of Neurology, University of Rochester Medical Center, School of Medicine and Dentistry, Rochester, New York, United States of America
| | | | - Michael Smith
- Sanofi Tucson Research Center, Oro Valley, Arizona, United States of America
| | | | - Steven A. Goldman
- Department of Neurology, University of Rochester Medical Center, School of Medicine and Dentistry, Rochester, New York, United States of America
| | | | - Pascual Ferrara
- Sanofi-Aventis Recherche & Développement, Centre de Toulouse, Toulouse, France
| | - Paul August
- Sanofi Tucson Research Center, Oro Valley, Arizona, United States of America
| |
Collapse
|
8
|
Natesan S, Ashworth S, Nielsen J, Tang SP, Salinas C, Kealey S, Lauridsen JB, Stensbøl TB, Gunn RN, Rabiner EA, Kapur S. Effect of chronic antipsychotic treatment on striatal phosphodiesterase 10A levels: a [¹¹C]MP-10 PET rodent imaging study with ex vivo confirmation. Transl Psychiatry 2014; 4:e376. [PMID: 24690597 PMCID: PMC4012281 DOI: 10.1038/tp.2014.17] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 01/14/2014] [Accepted: 02/23/2014] [Indexed: 12/31/2022] Open
Abstract
A number of phosphodiesterase 10A (PDE10) inhibitors are about to undergo clinical evaluation for their efficacy in treating schizophrenia. As phosphodiesterases are in the same signalling pathway as dopamine D2 receptors, it is possible that prior antipsychotic treatment could influence these enzyme systems in patients. Chronic, in contrast to acute, antipsychotic treatment has been reported to increase brain PDE10A levels in rodents. The aim of this study was to confirm these findings in a manner that can be translated to human imaging studies to understand its consequences. Positron emission tomography (PET) scanning was used to evaluate PDE10A enzyme availability, after chronic haloperidol administration, using a specific PDE10A ligand ([(11)C]MP-10). The binding of [(11)C]MP-10 in the striatum and the cerebellum was measured in rodents and a simplified reference tissue model (SRTM) with cerebellum as the reference region was used to determine the binding potential (BPND). In rats treated chronically with haloperidol (2 mg kg(-1) per day), there was no significant difference in PDE10A levels compared with the vehicle-treated group (BPND±s.d.: 3.57 ± 0.64 versus 2.86 ± 0.71). Following PET scans, ex vivo analysis of striatal brain tissue for PDE10A mRNA (Pde10a) and PDE10A enzyme activity showed no significant difference. Similarly, the PDE10A protein content determined by western blot analysis was similar between the two groups, contrary to an earlier finding. The results of the study indicate that prior exposure to antipsychotic medication in rodents does not alter PDE10A levels.
Collapse
Affiliation(s)
- S Natesan
- Department of Psychosis Studies, Institute of Psychiatry, King's College London, London, UK
| | - S Ashworth
- Imanova Centre for Imaging Sciences, Hammersmith Hospital, London, UK
| | - J Nielsen
- Division of Synaptic Transmission, H. Lundbeck A/S, Copenhagen, Denmark
| | - S-P Tang
- Imanova Centre for Imaging Sciences, Hammersmith Hospital, London, UK
| | - C Salinas
- Imanova Centre for Imaging Sciences, Hammersmith Hospital, London, UK
| | - S Kealey
- Department of Psychosis Studies, Institute of Psychiatry, King's College London, London, UK
| | - J B Lauridsen
- Division of Synaptic Transmission, H. Lundbeck A/S, Copenhagen, Denmark
| | - T B Stensbøl
- Division of Synaptic Transmission, H. Lundbeck A/S, Copenhagen, Denmark
| | - R N Gunn
- Imanova Centre for Imaging Sciences, Hammersmith Hospital, London, UK,Department of Medicine, Imperial College London, London, UK
| | - E A Rabiner
- Imanova Centre for Imaging Sciences, Hammersmith Hospital, London, UK,Department of Neuroimaging, Institute of Psychiatry, King's College London, London, UK
| | - S Kapur
- Department of Psychosis Studies, Institute of Psychiatry, King's College London, London, UK,Department of Psychosis Studies, Institute of Psychiatry, King's College London, De Crespigny Park, Denmark Hill, London SE5 8AF, UK. E-mail:
| |
Collapse
|
9
|
Coskun S, Qubbaj W, AlHassan S, Natesan S, Awratani K, Handyside A. Karyomapping (KM) as a universal preimplantation genetic diagnosis (PGD) for beta-globin gene (HBB) mutations combined with human leukocyte antigen (HLA) genotyping: a proof-of-principle study. Fertil Steril 2013. [DOI: 10.1016/j.fertnstert.2013.07.1349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
10
|
Auvergne RM, Sim FJ, Wang S, Chandler-Militello D, Burch J, Al Fanek Y, Davis D, Benraiss A, Walter K, Achanta P, Johnson M, Quinones-Hinojosa A, Natesan S, Ford HL, Goldman SA. Transcriptional differences between normal and glioma-derived glial progenitor cells identify a core set of dysregulated genes. Cell Rep 2013; 3:2127-41. [PMID: 23727239 DOI: 10.1016/j.celrep.2013.04.035] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2012] [Revised: 03/17/2013] [Accepted: 04/29/2013] [Indexed: 01/15/2023] Open
Abstract
Glial progenitor cells (GPCs) are a potential source of malignant gliomas. We used A2B5-based sorting to extract tumorigenic GPCs from human gliomas spanning World Health Organization grades II-IV. Messenger RNA profiling identified a cohort of genes that distinguished A2B5+ glioma tumor progenitor cells (TPCs) from A2B5+ GPCs isolated from normal white matter. A core set of genes and pathways was substantially dysregulated in A2B5+ TPCs, which included the transcription factor SIX1 and its principal cofactors, EYA1 and DACH2. Small hairpin RNAi silencing of SIX1 inhibited the expansion of glioma TPCs in vitro and in vivo, suggesting a critical and unrecognized role of the SIX1-EYA1-DACH2 system in glioma genesis or progression. By comparing the expression patterns of glioma TPCs with those of normal GPCs, we have identified a discrete set of pathways by which glial tumorigenesis may be better understood and more specifically targeted.
Collapse
Affiliation(s)
- Romane M Auvergne
- Center for Translational Neuromedicine, University of Rochester Medical Center, Rochester, NY 14642, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Coskun S, Qubbaj W, AlHassan S, Natesan S, Handyside A. O-5 Karyomapping accurately replicates the outcome of conventional genetic testing in PGD of beta-thalassemia without the need for prior test development. Reprod Biomed Online 2013. [DOI: 10.1016/s1472-6483(13)60038-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
12
|
Polo JM, Anderssen E, Walsh RM, Schwarz BA, Nefzger CM, Lim SM, Borkent M, Apostolou E, Alaei S, Cloutier J, Bar-Nur O, Cheloufi S, Stadtfeld M, Figueroa ME, Robinton D, Natesan S, Melnick A, Zhu J, Ramaswamy S, Hochedlinger K. A molecular roadmap of reprogramming somatic cells into iPS cells. Cell 2013; 151:1617-32. [PMID: 23260147 DOI: 10.1016/j.cell.2012.11.039] [Citation(s) in RCA: 642] [Impact Index Per Article: 58.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2012] [Revised: 10/09/2012] [Accepted: 11/20/2012] [Indexed: 12/28/2022]
Abstract
Factor-induced reprogramming of somatic cells into induced pluripotent stem cells (iPSCs) is inefficient, complicating mechanistic studies. Here, we examined defined intermediate cell populations poised to becoming iPSCs by genome-wide analyses. We show that induced pluripotency elicits two transcriptional waves, which are driven by c-Myc/Klf4 (first wave) and Oct4/Sox2/Klf4 (second wave). Cells that become refractory to reprogramming activate the first but fail to initiate the second transcriptional wave and can be rescued by elevated expression of all four factors. The establishment of bivalent domains occurs gradually after the first wave, whereas changes in DNA methylation take place after the second wave when cells acquire stable pluripotency. This integrative analysis allowed us to identify genes that act as roadblocks during reprogramming and surface markers that further enrich for cells prone to forming iPSCs. Collectively, our data offer new mechanistic insights into the nature and sequence of molecular events inherent to cellular reprogramming.
Collapse
Affiliation(s)
- Jose M Polo
- Massachusetts General Hospital Cancer Center and Center for Regenerative Medicine, 185 Cambridge Street, Boston, MA 02114, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Mondelli V, Anacker C, Vernon AC, Cattaneo A, Natesan S, Modo M, Dazzan P, Kapur S, Pariante CM. Haloperidol and olanzapine mediate metabolic abnormalities through different molecular pathways. Transl Psychiatry 2013; 3:e208. [PMID: 23321805 PMCID: PMC3566719 DOI: 10.1038/tp.2012.138] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The pathogenesis of antipsychotic-induced disturbances of glucose homeostasis is still unclear. Increased visceral adiposity has been suggested to be a possible mediating mechanism. The aim of this study was to investigate, in an animal model, the differential effects of olanzapine and haloperidol on visceral fat deposition (using magnetic resonance imaging(MRI)) and on critical nodes of the insulin signaling pathway (liver-protein levels of IRS2 (insulin receptor substrate 2), GSK3α (glycogen synthase kinase-3α), GSK3β, GSK3α-Ser21, GSK3β-Ser9). To this end, we studied male Sprague-Dawley rats treated with vehicle (n=8), haloperidol (2 mg kg(-1) per day, n=8), or olanzapine (10 mg kg(-1)per day, n=8), using osmotic minipumps, for 8 weeks. The haloperidol group showed a higher percentage of visceral fat than both the olanzapine group and the vehicle group, whereas there was no difference between the olanzapine and the vehicle group. In terms of insulin signaling pathway, the olanzapine group showed significantly reduced IRS2 levels, reduced phosphorylation of GSK3α and increased phosphorylation of GSK3β, whereas there was no difference between the haloperidol and the vehicle group. Our data suggest that different molecular pathways mediate the disturbances of glucose homeostasis induced by haloperidol and olanzapine with a direct effect of olanzapine on the insulin molecular pathway, possibly partly explaining the stronger propensity of olanzapine for adverse effects on glucose regulation when compared with haloperidol in clinical settings.
Collapse
Affiliation(s)
- V Mondelli
- King's College London, Institute of Psychiatry, Department of Psychological Medicine, London, UK.
| | - C Anacker
- King's College London, Institute of Psychiatry, Department of Psychological Medicine, London, UK
| | - A C Vernon
- King's College London, Institute of Psychiatry, Department of Psychosis Studies, London, UK,King's College London, Institute of Psychiatry, Department of Neuroscience, Centre for the Cellular Basis of Behaviour, London, UK
| | - A Cattaneo
- Department of Biomedical Sciences and Biotechnologies, Biology and Genetic Division, University of Brescia, Brescia, Italy
| | - S Natesan
- King's College London, Institute of Psychiatry, Department of Psychosis Studies, London, UK
| | - M Modo
- King's College London, Institute of Psychiatry, Department of Psychosis Studies, London, UK,King's College London, Institute of Psychiatry, Department of Neuroscience, Centre for the Cellular Basis of Behaviour, London, UK
| | - P Dazzan
- King's College London, Institute of Psychiatry, Department of Psychosis Studies, London, UK
| | - S Kapur
- King's College London, Institute of Psychiatry, Department of Psychosis Studies, London, UK
| | - C M Pariante
- King's College London, Institute of Psychiatry, Department of Psychological Medicine, London, UK
| |
Collapse
|
14
|
McNicholas TP, Yum K, Ahn JH, Mu B, Plettenburg O, Gooderman A, Natesan S, Strano MS. Structure and function of glucose binding protein-single walled carbon nanotube complexes. Small 2012; 8:3510-3516. [PMID: 22915545 DOI: 10.1002/smll.201200649] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Revised: 06/29/2012] [Indexed: 06/01/2023]
Abstract
Understanding the structure and function of glucose binding proteins (GBP) complexed with single walled carbon nanotubes (SWNTs) is important for the development of applications including fluorescent sensors and nanostructure particle tracking. Herein, circular dichroism (CD), thermal denaturation, photo-absorption spectroscopy and atomic force microscopy are used to study these nanostructures. The protein retains its glucose-binding activity after complexation and is thermally stable below 36 °C. However, the SWNT lowers the midpoint denaturation temperature (Tm) by 5 °C and 4 °C in the absence and presence of 10 mM glucose, respectively. This data highlights that using techniques such as CD and thermal denaturation may be necessary to fully characterize such protein-nanomaterial nanostructures.
Collapse
Affiliation(s)
- Thomas P McNicholas
- Department of Chemical Engineering, The Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | | | | | | | | | | | | | | |
Collapse
|
15
|
Muthaiyan A, Martin EM, Natesan S, Crandall PG, Wilkinson BJ, Ricke SC. Antimicrobial effect and mode of action of terpeneless cold-pressed Valencia orange essential oil on methicillin-resistant Staphylococcus aureus. J Appl Microbiol 2012; 112:1020-33. [PMID: 22372962 DOI: 10.1111/j.1365-2672.2012.05270.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
AIMS The objectives of this study were to evaluate the antistaphylococcal effect and elucidate the mechanism of action of orange essential oil against antibiotic-resistant Staphylococcus aureus strains. METHODS AND RESULTS The inhibitory effect of commercial orange essential oil (EO) against six Staph. aureus strains was tested using disc diffusion and agar dilution methods. The mechanism of EO action on MRSA was analysed by transcriptional profiling. Morphological changes of EO-treated Staph. aureus were examined using transmission electron microscopy. Results showed that 0·1% of terpeneless cold-pressed Valencia orange oil (CPV) induced the cell wall stress stimulon consistent with the inhibition of cell wall synthesis. Transmission electron microscopic observation revealed cell lysis and suggested a cell wall lysis-related mechanism of CPV. CONCLUSIONS CPV inhibits the growth of Staph. aureus, causes gene expression changes consistent with the inhibition of cell wall synthesis, and triggers cell lysis. SIGNIFICANCE AND IMPACT OF THE STUDY Multiple antibiotics resistance is becoming a serious problem in the management of Staph. aureus infections. In this study, the altered expression of cell wall-associated genes and subsequent cell lysis in MRSA caused by CPV suggest that it may be a potential antimicrobial agent to control antibiotic-resistant Staph. aureus.
Collapse
Affiliation(s)
- A Muthaiyan
- Center for Food Safety and Department of Food Science, University of Arkansas, Fayetteville, AR 72704, USA
| | | | | | | | | | | |
Collapse
|
16
|
Long PM, Wesley UV, Jaworski DM, Rana M, Kiehl TR, So K, Gould P, Ajewung N, Kamnasaran D, Emmett MR, Wang X, Marshall AG, Ji Y, Fokt I, Skora S, Conrad CA, Priebe W, Zhu H, Cao X, Keir S, Ali-Osman F, Lo HW, Da Fonseca CO, Arun V, Wiley JC, Kaur H, Guha A, Fenton K, Abdelwahab MG, Stafford P, Rho JM, Preul MC, Scheck AC, Brossier NM, Carroll SL, Gajadhar A, Guha A, Mukherjee J, Wolf A, Hawkins C, Guha A, Costa P, Cardoso ALC, de Almeida LP, de Lima MCP, Canoll P, Bruce J, Lavon I, Granit A, Einstein O, Ben-Hur T, Siegal T, Pang JC, Poon WS, Zhou L, Ng HK, Rovin RA, Lawrence JE, Segula JJ, Winn RJ, Patil S, Burzynski SR, Mrowczynski E, Grela K, Cheng S, Liu K, Feng H, Bacho R, Kazlauskas A, Smith EM, Symes K, Hu B, Lee CY, Fotovati A, Dunn SE, Proescholdt MA, Storr EM, Lohmeier A, Brawanski A, Hu B, Feng H, Jarzynka MJ, Liu K, Ravichandran KS, Vuori K, Tang C, Nshikawa R, Johns TG, Furnari FB, Cavenee WK, Cheng S, Zhong J, O'Neill GM, Deleyrolle LP, Rahman M, Dunbar EM, Caldeira MA, Reynolds BA, Liu X, Yacyshyn S, Dasgupta B, Han X, Yang X, Wheeler CG, Filippova N, Langford CP, Ding Q, Fathallah HM, Gillespie GY, Nabors LB, Davidson TB, Gortalum F, Ji L, Engell K, Sposto R, Asgharzadeh S, Erdreich-Epstein A, Lawn SO, Weiss S, Senger D, Forsyth P, Latha K, Chumbalkar V, Li M, Gururaj A, Hwang Y, Maywald R, Dakeng S, Dao L, Baggerly K, Sawaya R, Aldape K, Cavenee W, Furnari F, Bogler O, Hwang Y, Chumbalkar V, Latha K, Bogler O, Gururaj A, Bogler O, Chumbalkar V, Arumugam J, Dao L, Baggerly K, Priebe W, Bogler O, Sim H, Pineda CA, Pan Y, Hu B, Viapiano MS, Van Schaick JA, Akagi K, Burkett S, DiFabio C, Tuskan R, Walrath J, Reilly K, Dai B, Jing Z, Kang SH, Li D, Xie K, Huang S, Gong X, Vuong Y, Bota DA, Stegh AH, Furnari F, Inda MDM, Bonavia R, Mukasa A, Narita Y, Sah D, Vandenberg S, Brennan C, Johns T, Bachoo R, Hadwiger P, Tan P, Tan P, DePinho R, Cavenee W, Kusne Y, Meerson A, Rushing EJ, Yang W, Aldape K, McDonough W, Kislin K, Loftus JC, Berens M, Lu Z, Ghosh S, Verma A, Zhou H, Chin S, Bruggers C, Kestle J, Khatua S, Broekman ML, Maas NS, Skog J, Breakefield XO, Sena-Esteves M, de Vrij J, Lamfers M, Maas N, Dirven C, Esteves M, Broekman M, Chidambaram A, Dumur CI, Graf M, Vanmeter TE, Fillmore HL, Broaddus WC, Silber J, Ozawa T, Kastenhuber E, Djaballah H, Holland EC, Huse JT, Wolf A, Agnihotri S, Munoz D, Hawkins C, Guha A, Han JE, Albesiano E, Pradilla G, Lim M, Alshami J, Sabau C, Seyed Sadr M, Anan M, Seyed Sadr E, Siu V, Del Maestro R, Trinh G, Le P, Petrecca K, Sonabend AM, Soderquist C, Lei L, Guarnieri P, Leung R, Yun J, Sisti J, Castelli M, Bruce S, Bruce R, Ludwig T, Rosenfeld S, Bruce JN, Canoll P, Phillips JJ, Huillard E, Polley MY, Rosen SD, Rowitch DH, Werb Z, Sarkar C, Jha P, Pathak P, Suri V, Sharma MC, Chattopadhyay P, Chosdol K, Suri A, Gupta D, Mahapatra AK, Kapoor GS, Zhan Y, Boockvar JA, O'Rourke DM, Kwatra MM, Kim JW, Park CK, Han JH, Park SH, Kim SK, Jung HW, Narayanan R, Levin BS, Maeder ML, Joung JK, Nutt CL, Louis DN, Dudley A, Jayaram P, Pei Z, Shi X, Laterra J, Watkins PA, Mawrin C, Rempel SA, McClung HM, McFarland BC, Nozell SE, Huszar D, Benveniste EN, Burton T, Eisenstat DD, Gibson SB, Lukiw WJ, Cui JG, Li YY, Zhao Y, Culicchia F, See W, Pieper R, Luchman A, Stechishin O, Nguyen S, Kelly J, Blough M, Cairncross G, Weiss S, Shah SR, Mohyeldin A, Adams H, Garzon-Muvdi T, Aprhys C, Quinones-Hinojosa A, Weeks AC, Restrepo A, Arun V, Ivanchuk S, Smith C, Rutka JT, Sengupta R, Yang L, Burbassi S, Zhang B, Markant SL, Yang ZJ, Meucci O, Wechsler-Reya RJ, Rubin JB, Wykosky J, Mukasa A, Chin L, Cavenee W, Furnari F, Auvergne RM, Sim FJ, Wang S, Chandler-Militello D, Burch J, Li X, Bennet A, Mohile N, Pilcher W, Walter K, Johnson M, Achanta P, Quinones-Hinojosa A, Natesan S, Goldman SA, Beauchamp AS, Gibo DM, Wykosky J, Debinski W, Jiang H, Martin V, Gomez-Manzano C, Johnson DG, Alonso M, White EJ, Xu J, McDonnell T, Shinojima N, Fueyo J, Sandhya Rani MR, Huang P, Prayson R, Hedayat H, Sloan AE, Novacki A, Ahluwalia MS, Tipps R, Gladson CL, Liu JL, Mao Z, Xu J, Fueyo J, Yung WKA, Bhat K, Salazar K, Balasubramaniyan V, Vaillant B, Hollingsworth F, Gumin J, Diefes K, Patel D, Lang F, Colman H, Aldape K, Parsyan A, Shahbazian D, Alain T, Martineau Y, Petroulakis E, Larsson O, Gkogkas C, Topisirovic I, Mathonnet G, Tettweiler G, Hellen C, Pestova T, Svitkin Y, Sonenberg N, Zerrouqi A, Pyrzynska B, Van Meir E, Twitty GB, Nozell SE, Hong SW, Benveniste EN, Lee HK, Finniss S, Xiang C, Cazacu S, Brodie C, Ginn KF, Wise A, Farassati F, Nozell SE, Hong SW, Twitty GB, McFarland BC, Benveniste EN, Brown C, Barish M, deCarvalho AC, Hasselbach L, Nelson K, Lemke N, Schultz L, Mikkelsen T, Onvani S, Kongkham P, Smith CA, Rutka JT, Bier A, Finniss S, Hershkovitz H, Kahana S, Xiang C, Cazacu S, Decarvalho A, Brodie C, Massey SC, Swanson KR, Canoll P. Cell Biology and Signaling. Neuro Oncol 2010. [DOI: 10.1093/neuonc/noq116.s2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
17
|
Irie HY, Shrestha Y, Selfors LM, Frye F, Iida N, Wang Z, Zou L, Yao J, Lu Y, Epstein CB, Natesan S, Richardson AL, Polyak K, Mills GB, Hahn WC, Brugge JS. PTK6 regulates IGF-1-induced anchorage-independent survival. PLoS One 2010; 5:e11729. [PMID: 20668531 PMCID: PMC2909213 DOI: 10.1371/journal.pone.0011729] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Accepted: 06/07/2010] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Proteins that are required for anchorage-independent survival of tumor cells represent attractive targets for therapeutic intervention since this property is believed to be critical for survival of tumor cells displaced from their natural niches. Anchorage-independent survival is induced by growth factor receptor hyperactivation in many cell types. We aimed to identify molecules that critically regulate IGF-1-induced anchorage-independent survival. METHODS AND RESULTS We conducted a high-throughput siRNA screen and identified PTK6 as a critical component of IGF-1 receptor (IGF-1R)-induced anchorage-independent survival of mammary epithelial cells. PTK6 downregulation induces apoptosis of breast and ovarian cancer cells deprived of matrix attachment, whereas its overexpression enhances survival. Reverse-phase protein arrays and subsequent analyses revealed that PTK6 forms a complex with IGF-1R and the adaptor protein IRS-1, and modulates anchorage-independent survival by regulating IGF-1R expression and phosphorylation. PTK6 is highly expressed not only in the previously reported Her2(+) breast cancer subtype, but also in high grade ER(+), Luminal B tumors and high expression is associated with adverse outcomes. CONCLUSIONS These findings highlight PTK6 as a critical regulator of anchorage-independent survival of breast and ovarian tumor cells via modulation of IGF-1 receptor signaling, thus supporting PTK6 as a potential therapeutic target for multiple tumor types. The combined genomic and proteomic approaches in this report provide an effective strategy for identifying oncogenes and their mechanism of action.
Collapse
Affiliation(s)
- Hanna Y. Irie
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts, United States of America
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Yashaswi Shrestha
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Laura M. Selfors
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Fabianne Frye
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Naoko Iida
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Zhigang Wang
- Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts, United States of America
| | - Lihua Zou
- Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts, United States of America
| | - Jun Yao
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Yiling Lu
- Department of Systems Biology, University of Texas MD Anderson Cancer Center, Houston, Texas, United States of America
| | - Charles B. Epstein
- Sanofi-Aventis, Cambridge, Massachusetts, United States of America
- Broad Institute of Harvard and Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts, United States of America
| | - Sridaran Natesan
- Sanofi-Aventis, Cambridge, Massachusetts, United States of America
| | - Andrea L. Richardson
- Department of Pathology, Brigham and Women's Hospital, Boston, Massachusetts, United States of America
| | - Kornelia Polyak
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States of America
| | - Gordon B. Mills
- Department of Systems Biology, University of Texas MD Anderson Cancer Center, Houston, Texas, United States of America
| | - William C. Hahn
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts, United States of America
- Broad Institute of Harvard and Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts, United States of America
| | - Joan S. Brugge
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail:
| |
Collapse
|
18
|
Stadtfeld M, Apostolou E, Akutsu H, Fukuda A, Follett P, Natesan S, Kono T, Shioda T, Hochedlinger K. Aberrant silencing of imprinted genes on chromosome 12qF1 in mouse induced pluripotent stem cells. Nature 2010; 465:175-81. [PMID: 20418860 PMCID: PMC3987905 DOI: 10.1038/nature09017] [Citation(s) in RCA: 601] [Impact Index Per Article: 42.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2009] [Accepted: 03/17/2010] [Indexed: 11/08/2022]
Abstract
Induced pluripotent stem cells (iPSCs) have been generated by enforced expression of defined sets of transcription factors in somatic cells. It remains controversial whether iPSCs are molecularly and functionally equivalent to blastocyst-derived embryonic stem (ES) cells. By comparing genetically identical mouse ES cells and iPSCs, we show here that their overall messenger RNA and microRNA expression patterns are indistinguishable with the exception of a few transcripts encoded within the imprinted Dlk1-Dio3 gene cluster on chromosome 12qF1, which were aberrantly silenced in most of the iPSC clones. Consistent with a developmental role of the Dlk1-Dio3 gene cluster, these iPSC clones contributed poorly to chimaeras and failed to support the development of entirely iPSC-derived animals ('all-iPSC mice'). In contrast, iPSC clones with normal expression of the Dlk1-Dio3 cluster contributed to high-grade chimaeras and generated viable all-iPSC mice. Notably, treatment of an iPSC clone that had silenced Dlk1-Dio3 with a histone deacetylase inhibitor reactivated the locus and rescued its ability to support full-term development of all-iPSC mice. Thus, the expression state of a single imprinted gene cluster seems to distinguish most murine iPSCs from ES cells and allows for the prospective identification of iPSC clones that have the full development potential of ES cells.
Collapse
Affiliation(s)
- Matthias Stadtfeld
- Massachusetts General Hospital Center for Regenerative Medicine; Harvard Stem Cell Institute, 185 Cambridge Street, Boston, MA 02114, USA
- Massachusetts General Hospital Cancer Center and Harvard Medical School, 149 13 Street, Charlestown, MA 02129, USA
- Department of Stem Cell and Regenerative Biology, Harvard University and Harvard Medical School, 42 Church Street, Cambridge, MA 02138, USA
| | - Effie Apostolou
- Massachusetts General Hospital Center for Regenerative Medicine; Harvard Stem Cell Institute, 185 Cambridge Street, Boston, MA 02114, USA
- Massachusetts General Hospital Cancer Center and Harvard Medical School, 149 13 Street, Charlestown, MA 02129, USA
- Department of Stem Cell and Regenerative Biology, Harvard University and Harvard Medical School, 42 Church Street, Cambridge, MA 02138, USA
| | - Hidenori Akutsu
- Department of Reproductive Biology, National Institute for Child Health and Development, Tokyo 157-8535, Japan
| | - Atsushi Fukuda
- Department of BioScience, Tokyo University of Agriculture, Tokyo 156-8502, Japan
| | - Patricia Follett
- Massachusetts General Hospital Center for Regenerative Medicine; Harvard Stem Cell Institute, 185 Cambridge Street, Boston, MA 02114, USA
| | | | - Tomohiro Kono
- Department of BioScience, Tokyo University of Agriculture, Tokyo 156-8502, Japan
| | - Toshi Shioda
- Massachusetts General Hospital Cancer Center and Harvard Medical School, 149 13 Street, Charlestown, MA 02129, USA
| | - Konrad Hochedlinger
- Massachusetts General Hospital Center for Regenerative Medicine; Harvard Stem Cell Institute, 185 Cambridge Street, Boston, MA 02114, USA
- Massachusetts General Hospital Cancer Center and Harvard Medical School, 149 13 Street, Charlestown, MA 02129, USA
- Department of Stem Cell and Regenerative Biology, Harvard University and Harvard Medical School, 42 Church Street, Cambridge, MA 02138, USA
| |
Collapse
|
19
|
|
20
|
|
21
|
Sim FJ, Lang JK, Waldau B, Roy NS, Schwartz TE, Pilcher WH, Chandross KJ, Natesan S, Merrill JE, Goldman SA, Goldmanm SA. Complementary patterns of gene expression by human oligodendrocyte progenitors and their environment predict determinants of progenitor maintenance and differentiation. Ann Neurol 2006; 59:763-79. [PMID: 16634042 DOI: 10.1002/ana.20812] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
OBJECTIVE Glial progenitor cells are abundant in adult human white matter. This study was designed to identify signaling pathways regulating their self-renewal and fate. METHODS We compared the transcriptional profiles of freshly sorted adult human white matter progenitor cells (WMPCs), purified by A2B5-based immunomagnetic sorting, with those of the white matter from which they derived. RESULTS We identified 132 genes differentially expressed by WMPCs; these included principal components of five receptor-defined signaling pathways, represented by platelet derived growth factor receptor alpha (PDGFRA) and type 3 fibroblast growth factor receptor (FGFR3), receptor tyrosine phosphatase-beta/zeta (RTPZ), notch, and syndecan3. WMPCs also differentially expressed the bone morphogenetic protein 4 (BMP4) inhibitors neuralin and BAMBI (BMP and activin membrane-bound inhibitor), suggesting tonic defense against BMP signaling. Differential overexpression of RTPZ was accompanied by that of its modulators pleiotrophin, NrCAM, tenascin, and the chondroitin sulfate proteoglycans, suggesting the importance of RTPZ signaling to WMPCs. When exposed to the RTPZ inhibitor bpV(phen), or lentiviral-shRNAi against RTPZ, WMPCs differentiated as oligodendrocytes. Conversely, when neuralin and BAMBI were antagonized by BMP4, astrocytic differentiation was induced, which was reversible by noggin. INTERPRETATION The RTPZ and BMP pathways regulate the self-maintenance of adult human WMPCs, and can be modulated to induce their oligodendrocytic or astrocytic differentiation. As such, they provide targets by which to productively mobilize resident progenitor cells of the adult human brain.
Collapse
Affiliation(s)
- Fraser J Sim
- Department of Neurology, University of Rochester Medical Center, NY 14642, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Irie HY, Pearline RV, Grueneberg D, Hsia M, Ravichandran P, Kothari N, Natesan S, Brugge JS. Distinct roles of Akt1 and Akt2 in regulating cell migration and epithelial-mesenchymal transition. ACTA ACUST UNITED AC 2006; 171:1023-34. [PMID: 16365168 PMCID: PMC2171329 DOI: 10.1083/jcb.200505087] [Citation(s) in RCA: 455] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Akt family of kinases are activated by growth factors and regulate pleiotropic cellular activities. In this study, we provide evidence for isoform-specific positive and negative roles for Akt1 and -2 in regulating growth factor–stimulated phenotypes in breast epithelial cells. Insulin-like growth factor-I receptor (IGF-IR) hyperstimulation induced hyperproliferation and antiapoptotic activities that were reversed by Akt2 down-regulation. In contrast, Akt1 down-regulation in IGF-IR–stimulated cells promoted dramatic neomorphic effects characteristic of an epithelial–mesenchymal transition (EMT) and enhanced cell migration induced by IGF-I or EGF stimulation. The phenotypic effects of Akt1 down-regulation were accompanied by enhanced extracellular signal–related kinase (ERK) activation, which contributed to the induction of migration and EMT. Interestingly, down-regulation of Akt2 suppressed the EMT-like morphological conversion induced by Akt1 down-regulation in IGF-IR–overexpressing cells and inhibited migration in EGF-stimulated cells. These results highlight the distinct functions of Akt isoforms in regulating growth factor–stimulated EMT and cell migration, as well as the importance of Akt1 in cross-regulating the ERK signaling pathway.
Collapse
Affiliation(s)
- Hanna Y Irie
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | | | | | | | | | | | | | | |
Collapse
|
23
|
Abstract
The idea of a cell-based regeneration therapy for controlling or curing chronic human diseases is highly attractive. However, realization of this idea in the clinic has been hampered by the safety concerns associated with the transplantation of immortalized cells into human patients. An elegant study done by Roy and colleagues shows that neural progenitor cells immortalized by the ectopic expression of telomerase reverse transcriptase (TERT) can give rise to specific types of functionally competent neurons both in vitro and in vivo. Importantly, the immortalized progenitors maintained their phenotype with no evidence of transformation even several months after transplantation in mouse disease models. Although the potential use of telomerase-immortalized cells in the clinic remains controversial, Roy and colleagues work provides a compelling reason to seriously evaluate the potential use of telomerase-immortalized progenitor cells to treat neurodegenerative and other chronic human illnesses.
Collapse
Affiliation(s)
- Sridaran Natesan
- Sanofi-Aventis Cambridge Genomics Center, 26 Landsdowne Street, Cambridge, Massachussetts 02139, USA.
| |
Collapse
|
24
|
Abstract
The present study investigates enzyme activities of the urea cycle, transamidinase and ornithine-proline inter-conversion in the hypertrophied kidney after unilateral nephrectomy in mice. Surgical removal of the left kidney in mice led to compensatory enlargement of the right kidney after 1 and 14 days. This renal growth was associated with an increase in glomerular volume (but not number) and enlargement of the proximal convoluted tubules. The total renal protein content increased in proportion to the increase in kidney weight, but the protein per gram weight of kidney did not change. The specific activity of only ornithine aminotransferase (OAT), the rate-limiting enzyme in the conversion of ornithine to proline, increased in 2 weeks of hypertrophy. The specific activity of all other enzymes was unchanged. However, the total enzyme activity per kidney of all the enzymes, without exception, was elevated in the hypertrophied kidney. While the increase in total OAT activity was much more than the increase in kidney weight, all other enzymes increased more or less in proportion to the increase in renal mass. The results suggest that compensation in OAT activity to chronic reduction in renal mass was complete, but only partial in the case of other enzymes.
Collapse
Affiliation(s)
- S Natesan
- Department of Zoology, University of Pune, Pune - 411 007, Maharashtra, India.
| | | |
Collapse
|
25
|
Pollock R, Issner R, Zoller K, Natesan S, Rivera VM, Clackson T. Delivery of a stringent dimerizer-regulated gene expression system in a single retroviral vector. Proc Natl Acad Sci U S A 2000; 97:13221-6. [PMID: 11078518 PMCID: PMC27206 DOI: 10.1073/pnas.230446297] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Small molecule-regulated transcription has broad utility and would benefit from an easily delivered self-contained regulatory cassette capable of robust, tightly controlled target gene expression. We describe the delivery of a modified dimerizer-regulated gene expression system to cells on a single retrovirus. A transcription factor cassette responsive to the natural product dimerizer rapamycin was optimized for retroviral delivery by fusing a highly potent chimeric activation domain to the rapamycin-binding domain of FKBP-rapamycin-associated protein (FRAP). This improvement led to an increase in both the potency and maximal levels of gene expression induced by rapamycin, or nonimmunosuppressive rapamycin analogs. The modified transcription factor cassette was incorporated along with a target gene into a single rapamycin-responsive retrovirus. Cell pools stably transduced with the single virus system displayed negligible basal expression and gave induction ratios of at least three orders of magnitude in the presence of rapamycin or a nonimmunosuppressive rapamycin analog. Levels of induced gene expression were comparable to those obtained with the constitutive retroviral long terminal repeat and the single virus system performed well in four different mammalian cell lines. Regulation with the dimerizer-responsive retrovirus was tight enough to allow the generation of cell lines displaying inducible expression of the highly toxic diphtheria toxin A chain gene. The ability to deliver the tightly inducible rapamycin system in a single retrovirus should facilitate its use in the study of gene function in a broad range of cell types.
Collapse
Affiliation(s)
- R Pollock
- ARIAD Gene Therapeutics, Inc., 26 Landsdowne Street, Cambridge, MA 02139, USA.
| | | | | | | | | | | |
Collapse
|
26
|
Abstract
Bacterial respiration, endogenous as well as induced respiration by glucose, lactose and glycine betaine, was found to be sensitive to external solute concentration. Permeability of hydrogen peroxide, a non-electrolyte of molecular size between water and urea, through the bacterial membranes changed directly with the rate of respiration (an activity residing in the bacterial plasma membrane) in E. coli and the enhanced permeability and respiratory activity were highly correlated. Hydrogen peroxide permeability and induction of voids (spaces in the matrix of the bilayer into which hydrophobic fluorescent probes partition, which in turn were used to assess the modulation of these cavities) were shown to be a direct and excellent measure of leak conductance. Fluorescence intensity and anisotropy of the extrinsic fluorescent probes (incorporated by growing bacteria in their presence) decreased with increased respiration in bacteria, consistent with lowered molecular restriction and enhanced hydration in the membrane phase for these probes as seen in dimyristoylphosphatidylcholine bilayers due to phase transition. The physical basis of osmotic phenomena, as a relevant (thermodynamic) volume, could relate to water exchange or compression, depending on the osmotic domain. In the domain of compression in bacteria, i.e. well above the isotonic range, the computed activation volume was consistent with voids in the membrane. This study emphasises a major role of leak conductance in bacterial physiology and growth.
Collapse
Affiliation(s)
- S Natesan
- Department of Biotechnology, University of Pune, India
| | | | | |
Collapse
|
27
|
Natesan S, Molinari E, Rivera VM, Rickles RJ, Gilman M. A general strategy to enhance the potency of chimeric transcriptional activators. Proc Natl Acad Sci U S A 1999; 96:13898-903. [PMID: 10570170 PMCID: PMC24162 DOI: 10.1073/pnas.96.24.13898] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Efforts to increase the potency of transcriptional activators are generally unsuccessful because poor expression of activators in mammalian cells limits their delivery to target promoters. Here we report that the effectiveness of chimeric activators can be dramatically improved by expressing them as noncovalent tetrameric bundles. Bundled activation domains are much more effective at activating a reporter gene than simple monomeric activators, presumably because, at similar expression levels, up to 4 times as many the activation domains are delivered to the target promoter. These bundled activation domains are also more effective than proteins in which activation domains are tandemly reiterated in the same polypeptide chain, because such proteins are very poorly expressed and therefore not delivered effectively. These observations suggest that there is a threshold number of activation domains that must be bound to a promoter for activation, above which promoter activity is simply a function of the number of activators bound. We show that bundling can be exploited practically to enhance the sensitivity of mammalian two-hybrid assays, enabling detection of weak interactions or those between poorly expressed proteins. Bundling also dramatically improves the performance of a small-molecule-regulated gene expression system when the expression level of regulatory protein is limiting, a situation that may be encountered in gene therapy applications.
Collapse
Affiliation(s)
- S Natesan
- ARIAD Gene Therapeutics Incorporated, 26 Landsdowne Street, Cambridge, MA 02139, USA.
| | | | | | | | | |
Collapse
|
28
|
Abstract
We show that the intracellular concentration of transcriptional activator proteins is regulated by the proteasome-mediated protein degradation pathway. The rate of degradation of activators by proteasomes correlates with activation domain potency in vivo. Mutations either in the activation domain residues involved in target protein interaction or in the DNA-binding domain residues essential for DNA binding abolish the transcriptional activation function in vivo and render the activator resistant to degradation by proteasomes. Finally, using a rapamycin-regulated gene expression system, we show that recruiting activation domains to DNA-bound receptor proteins greatly enhanced the rate of degradation of reconstituted activators. These observations suggest that in mammalian cells efficient recruitment of activator-target protein complexes to the promoter means that they are subjected to rapid degradation by proteasomes. We propose that proteasome-mediated control of the intracellular levels of transcriptional activators could play an important role in the regulation of gene expression.
Collapse
Affiliation(s)
- E Molinari
- ARIAD Gene Therapeutics Inc., 26 Landsdowne Street, Cambridge, MA 02139, USA
| | | | | |
Collapse
|
29
|
|
30
|
Amara JF, Clackson T, Rivera VM, Guo T, Keenan T, Natesan S, Pollock R, Yang W, Courage NL, Holt DA, Gilman M. A versatile synthetic dimerizer for the regulation of protein-protein interactions. Proc Natl Acad Sci U S A 1997; 94:10618-23. [PMID: 9380684 PMCID: PMC23423 DOI: 10.1073/pnas.94.20.10618] [Citation(s) in RCA: 168] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The use of low molecular weight organic compounds to induce dimerization or oligomerization of engineered proteins has wide-ranging utility in biological research as well as in gene and cell therapies. Chemically induced dimerization can be used to activate intracellular signal transduction pathways or to control the activity of a bipartite transcription factor. Dimerizer systems based on the natural products cyclosporin, FK506, rapamycin, and coumermycin have been described. However, owing to the complexity of these compounds, adjusting their binding or pharmacological properties by chemical modification is difficult. We have investigated several families of readily prepared, totally synthetic, cell-permeable dimerizers composed of ligands for human FKBP12. These molecules have significantly reduced complexity and greater adaptability than natural product dimers. We report here the efficacies of several of these new synthetic compounds in regulating two types of protein dimerization events inside engineered cells--induction of apoptosis through dimerization of engineered Fas proteins and regulation of transcription through dimerization of transcription factor fusion proteins. One dimerizer in particular, AP1510, proved to be exceptionally potent and versatile in all experimental contexts tested.
Collapse
Affiliation(s)
- J F Amara
- ARIAD Gene Therapeutics, Inc., 26 Landsdowne Street, Cambridge, MA 02139, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Rivera VM, Clackson T, Natesan S, Pollock R, Amara JF, Keenan T, Magari SR, Phillips T, Courage NL, Cerasoli F, Holt DA, Gilman M. A humanized system for pharmacologic control of gene expression. Nat Med 1996; 2:1028-32. [PMID: 8782462 DOI: 10.1038/nm0996-1028] [Citation(s) in RCA: 407] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Gene therapy was originally conceived as a medical intervention to replace or correct defective genes in patients with inherited disorders. However, it may have much broader potential as an alternative delivery platform for protein therapeutics, such as cytokines, hormones, antibodies and novel engineered proteins. One key technical barrier to the widespread implementation of this form of therapy is the need for precise control over the level of protein production. A suitable system for pharmacologic control of therapeutic gene expression would permit precise titration of gene product dosage, intermittent or pulsatile treatment, and ready termination of therapy by withdrawal of the activating drug. We set out to design such a system with the following properties: (1) low baseline expression and high induction ratio; (2) positive control by an orally bioavailable small-molecule drug; (3) reduced potential for immune recognition through the exclusive use of human proteins; and (4) modularity to allow the independent optimization of each component using the tools of protein engineering. We report here the properties of this system and demonstrate its use to control circulating levels of human growth hormone in mice implanted with engineered human cells.
Collapse
Affiliation(s)
- V M Rivera
- ARIAD Gene Therapeutics, Cambridge, Massachusetts 02139, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Abstract
YY1 is a multifunctional transcription factor that acts as an activator or repressor in different contexts. YY1 binds to multiple sites in the mouse c-fos promoter, inducing at each site a sharp DNA bend. Binding of YY1 to a site situated between the cyclic AMP response element (CRE) and the TATA box bends the DNA in a way that interferes with the interaction of proteins bound at the CRE and TATA elements, resulting in repression of transcription. Here, we show that binding of YY1 to a different site in the c-fos promoter has a different result. Binding of YY1 to the c-fos serum response element (SRE) enhances the binding of serum response factor (SRF). This enhancement requires the binding of YY1 to SRE DNA. YY1 and SRF can cooccupy the SRE at least transiently. In the region of overlapping contact, YY1 contacts DNA in the major groove, while SRF contacts DNA in the minor groove. YY1 also enhances the association of SRF with the SRE in transfected insect cells. Thus, although YY1 induces similar structural changes in DNA at different binding sites, it can have distinct local effects on protein-DNA and protein-protein interactions. These data support a general role for YY1 in the building of highly organized promoter complexes.
Collapse
Affiliation(s)
- S Natesan
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA
| | | |
Collapse
|
33
|
Abstract
The assembly of multicomponent complexes at promoters, enhancers, and silencers likely entails perturbations in the path of the DNA helix. We present evidence that YY1, a ubiquitously expressed DNA-binding protein, regulates the activity of the c-fos promoter primarily through an effect on DNA structure. YY1 binds to and induces a phased DNA bend at three sites in this promoter. By use of a truncated c-fos promoter activity containing a single functional YY1 site, we show that YY1 represses promoter activity but that repression does not appear to be an intrinsic property of the protein in this context. Moreover, when the orientation of the YY1 site is reversed, YY1 activates the same promoter. Repression by YY1 is also alleviated by changing the relative phasing of factor-binding sites on either side of YY1. We conclude that the principal function of YY1 in this promoter is to bend DNA to regulate contact between other proteins. Thus, YY1 represents a new class of transcription factors that influences promoter function by affecting promoter structure rather than by directly contacting the transcriptional machinery. We provide evidence that the product of the male sex determination gene SRY may also belong to this class of structural factors.
Collapse
Affiliation(s)
- S Natesan
- Cold Spring Harbor Laboratory, New York 11724
| | | |
Collapse
|
34
|
Abstract
Cells with distinct developmental histories can respond differentially to identical signals, suggesting that signals are interpreted in a fashion that reflects a cell's identity. How this might occur is suggested by the observation that proteins of the homeodomain family, including a newly identified human protein, enhance the DNA-binding activity of serum response factor, a protein required for the induction of genes by growth and differentiation factors. Interaction with proteins of the serum response factor family may allow homeodomain proteins to specify the transcriptional response to inductive signals. Moreover, because the ability to enhance the binding of serum response factor to DNA residues within the homeodomain but is independent of homeodomain DNA-binding activity, this additional activity of the homeodomain may account for some of specificity of action of homeodomain proteins in development.
Collapse
|
35
|
Abstract
Ornithine carbamoyltransferase (OCT) and arginase, but not arginine synthetase (AS), were detected in the body wall and gut tissues of the leech. The activities of these enzymes were not altered by starvation. The high activity of arginase in body wall is probably due to the association of the latter with botryoidal tissue. Hirudineans, which evolved from oligochaete ancestors, appear to have lost the citrulline-arginine segment of the urea cycle due to their ammonotelic mode of nitrogen excretion.
Collapse
Affiliation(s)
- S Natesan
- Department of Zoology, University of Poona, Pune, India
| | | | | | | |
Collapse
|
36
|
Ghegadmal CK, Natesan S, Reddy SR. Allantoin excretion in snakes. Indian J Exp Biol 1989; 27:1008-9. [PMID: 2620928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Allantoin, which is generally regarded as absent in the excreta of snakes, has been demonstrated in the urinary deposits of 7 species of snakes by a sensitive paper chromatographic method. It appears that allantoin is the end product of purine catabolism in these animals.
Collapse
|
37
|
Natesan S, Quinn EM, Bentley MM. The expression of sequences similar to the human c-erb-A oncogene are regulated in a tissue and stage specific manner in Drosophila melanogaster. Oncogene 1989; 4:1397-401. [PMID: 2478942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The gene encoding the human thyroid hormone receptor, c-erb-A, is hypothesized to be a member of a superfamily of genes, which originated from a primordial receptor encoding gene. To trace the molecular evolutionary background of this gene, we initiated the search for it in the genome of Drosophila melanogaster by using low stringency hybridization analysis. We report here the presence of more than one gene in Drosophila with varying degrees of sequence similarity. By RNA blot hybridization analyses utilizing both wild type and a temperature sensitive ecdysone deficient mutant strain, ecd1, with a human c-erb-A probe, we show that a single high molecular weight RNA of 6.8kb in size is recognized by human c-erb-A, is regulated in a stage and tissue specific manner, and is also inducible in organisms of the ecd1 mutant strain in the presence of exogeneous ecdysone.
Collapse
Affiliation(s)
- S Natesan
- Department of Biological Sciences, University of Calgary, Alberta, Canada
| | | | | |
Collapse
|
38
|
|