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Nguyen TT, Pham TNM, Nguyen CTN, Truong TN, Bishop C, Doan NQH, Le THV. Phytochemistry and Cytotoxic Activity of Aquilaria crassna Pericarp on MDA-MB-468 Cell Lines. ACS Omega 2023; 8:42356-42366. [PMID: 38024711 PMCID: PMC10652264 DOI: 10.1021/acsomega.3c04656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 10/10/2023] [Accepted: 10/13/2023] [Indexed: 12/01/2023]
Abstract
The extracts of Aquilaria crassna pericarp were investigated on the MDA-MB-468, a breast cancer cell line, at desired concentration (1-50 μg/mL). The results showed that the dichloromethane (DCM) extract exhibited the strongest toxicity and was carried out subsequently. A total of nine compounds were isolated from the DCM extract using column chromatography and recrystallization, of which their structures were determined. Intriguingly, in addition to the previously reported compounds, neocucurbitacin A, a cucurbitacin triterpenoid aglycone with a lactone in ring A, was reported for the first time in the Aquilaria genus. Among the isolated compounds, cucurbitacin E highly inhibited MDA-MB-468 cell growth in a dose-dependent manner. Owing to binding abilities with the SH2 domain in the molecular docking study, cucurbitacin E, neocucurbitan A, neocucurbitan B, and cucurbitacin E 2-O-β-d-glucopyranoside act as STAT3 inhibitors and are suitable for further research. This study suggests thatAquilaria crassnafruits could serve as a promising source of natural compounds with potential anticancer effects, particularly against breast cancer.
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Affiliation(s)
- Thao Thi
Thu Nguyen
- Faculty
of Pharmacy, University of Medicine and
Pharmacy at Ho Chi Minh City, 41 Dinh Tien Hoang, Ben Nghe Ward, District 1, Ho Chi Minh City 70000, Vietnam
| | - Thu Nguyen Minh Pham
- Faculty
of Pharmacy, University of Medicine and
Pharmacy at Ho Chi Minh City, 41 Dinh Tien Hoang, Ben Nghe Ward, District 1, Ho Chi Minh City 70000, Vietnam
| | - Chi Thi Ngoc Nguyen
- Faculty
of Pharmacy, University of Medicine and
Pharmacy at Ho Chi Minh City, 41 Dinh Tien Hoang, Ben Nghe Ward, District 1, Ho Chi Minh City 70000, Vietnam
| | - Tuyen N. Truong
- Faculty
of Pharmacy, University of Medicine and
Pharmacy at Ho Chi Minh City, 41 Dinh Tien Hoang, Ben Nghe Ward, District 1, Ho Chi Minh City 70000, Vietnam
| | - Cleo Bishop
- Center
of Cell Biology and Cutaneous Research, Blizard Institute, Barts and
The London Faculty of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, U.K.
| | - Nam Q. H. Doan
- Faculty
of Pharmacy, Van Lang University, 69/68 Dang Thuy Tram Street, Ward
13, Binh Thanh District, Ho Chi Minh City 70000, Vietnam
| | - Thi Hong Van Le
- Faculty
of Pharmacy, University of Medicine and
Pharmacy at Ho Chi Minh City, 41 Dinh Tien Hoang, Ben Nghe Ward, District 1, Ho Chi Minh City 70000, Vietnam
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2
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Galdon G, Pourhabibi Zarandi N, Zhang S, Pettenati M, Bishop C, Atala A, Sadri-Ardekani H. Klinefelter syndrome testicular organoids: Androgen production and spermatogonia differentiation in vitro. Eur Urol 2023. [DOI: 10.1016/s0302-2838(23)00710-8] [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: 02/12/2023]
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3
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Anand A, Harwood DS, Bishop C, Todd K, Ellis R, Ellis R, Poulsen FR, Kristensen BW. P12.08.A Uncovering the glioblastoma tumor-microenvironment by high-end multiplexing with imaging mass cytometry. Neuro Oncol 2022. [DOI: 10.1093/neuonc/noac174.273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Glioblastoma is one of the most aggressive cancers, and hypoxia plays an essential role in its tumor- microenvironment. Tumor-associated microglia and macrophages (TAMs) have been reported to constitute up to 30 % of the cells, a fraction that is even higher in hypoxic areas. Single-cell mRNA sequencing of glioblastoma tumors has revealed vast heterogeneity, but the spatial aspects are not entirely defined yet. The aim of this study was to uncover differences between the hypoxic and normoxic tumor-microenvironment of human glioblastoma by high-end multiplexing with imaging mass cytometry.
Material and Methods
A tissue microarray (TMA) with normoxic and hypoxic areas from 4 IDH-wildtype glioblastomas was prepared based on the hypoxia marker hypoxia-inducing factor 1 alpha (HIF1 alpha). The TMA was stained with 18 metal-tagged antibodies covering TAMs, lymphocytes, immune checkpoints, vessels, tumor cells and proliferation. The Hyperion-CYTOF technology was used to ablate the samples and the images were analyzed by MCD viewer, Visiopharm software, and customized R scripts.
Results
Single-cell analysis of 160 fields covering around 45,000 cells in the glioblastoma microenvironment revealed multiple cellular phenotypes. It was revealed that proliferating TAMs (IBA1+, Ki67+) were more frequent in hypoxia, whereas proliferating vessels (CD34+, Ki67+) were more frequent in normoxia. Additionally, proliferating stem-like tumor cells (OLIG-2+, Ki67+) were more frequent in normoxia regions.
Conclusion
Our study revealed multiple cellular phenotypes in the glioblastoma microenvironment. The TAMs, endothelial and tumor cell phenotypes revealed may play a critical role in glioblastoma biology however this needs to be elucidated in future studies.
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Affiliation(s)
- A Anand
- Department of Pathology, The Bartholin Institute, Rigshospitalet , Copenhagen , Denmark
- Department of Pathology, The Bartholin Institute, Rigshospitalet , Copenhagen , Denmark
| | - D S Harwood
- Department of Pathology, The Bartholin Institute, Rigshospitalet , Copenhagen , Denmark
| | - C Bishop
- NIHR Guy's and St Thomas' Biomedical Research Centre at Guy's and St Thomas' NHS Foundation Trust and King's College London , London , United Kingdom
| | - K Todd
- NIHR Guy's and St Thomas' Biomedical Research Centre at Guy's and St Thomas' NHS Foundation Trust and King's College London , London , United Kingdom
| | - R Ellis
- NIHR Guy's and St Thomas' Biomedical Research Centre at Guy's and St Thomas' NHS Foundation Trust and King's College London , London , United Kingdom
| | - R Ellis
- NIHR Guy's and St Thomas' Biomedical Research Centre at Guy's and St Thomas' NHS Foundation Trust and King's College London , London , United Kingdom
| | - F R Poulsen
- Department of Neurosurgery, Odense University Hospital, Odense, Denmark, OUH , Odense , Denmark
| | - B W Kristensen
- Department of Pathology, The Bartholin Institute, Rigshospitalet , Copenhagen , Denmark
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4
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Shah N, Bishop C, Anderson S, Sandow T, Hon C, Ramalingam V. Abstract No. 387 Evaluation of renal function and contrast-induced nephropathy in patients with clinical concern for lower gastrointestinal bleed: comparison of patients with negative initial computed tomography angiography and positive computed tomography angiography with subsequent catheter-directed angiography. J Vasc Interv Radiol 2020. [DOI: 10.1016/j.jvir.2019.12.448] [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] Open
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5
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Gorgoulis V, Adams PD, Alimonti A, Bennett DC, Bischof O, Bishop C, Campisi J, Collado M, Evangelou K, Ferbeyre G, Gil J, Hara E, Krizhanovsky V, Jurk D, Maier AB, Narita M, Niedernhofer L, Passos JF, Robbins PD, Schmitt CA, Sedivy J, Vougas K, von Zglinicki T, Zhou D, Serrano M, Demaria M. Cellular Senescence: Defining a Path Forward. Cell 2019; 179:813-827. [PMID: 31675495 DOI: 10.1016/j.cell.2019.10.005] [Citation(s) in RCA: 1339] [Impact Index Per Article: 267.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 09/20/2019] [Accepted: 10/03/2019] [Indexed: 01/10/2023]
Abstract
Cellular senescence is a cell state implicated in various physiological processes and a wide spectrum of age-related diseases. Recently, interest in therapeutically targeting senescence to improve healthy aging and age-related disease, otherwise known as senotherapy, has been growing rapidly. Thus, the accurate detection of senescent cells, especially in vivo, is essential. Here, we present a consensus from the International Cell Senescence Association (ICSA), defining and discussing key cellular and molecular features of senescence and offering recommendations on how to use them as biomarkers. We also present a resource tool to facilitate the identification of genes linked with senescence, SeneQuest (available at http://Senequest.net). Lastly, we propose an algorithm to accurately assess and quantify senescence, both in cultured cells and in vivo.
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Affiliation(s)
- Vassilis Gorgoulis
- Molecular Carcinogenesis Group, Department of Histology and Embryology, Medical School, National and Kapodistrian University of Athens, Athens, Greece; Biomedical Research Foundation, Academy of Athens, Athens, Greece; Faculty Institute for Cancer Sciences, Manchester Academic Health Sciences Centre, University of Manchester, Manchester, UK; Center for New Biotechnologies and Precision Medicine, Medical School, National and Kapodistrian University of Athens, Athens, Greece.
| | - Peter D Adams
- Institute of Cancer Sciences, University of Glasgow, Glasgow G61 1BD, UK; CRUK Beatson Institute, Glasgow G61 1BD, UK; Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - Andrea Alimonti
- Institute of Oncology Research (IOR), Oncology Institute of Southern Switzerland, Bellinzona, Switzerland; Università della Svizzera Italiana, Faculty of Biomedical Sciences, Lugano, Switzerland; Department of Medicine, University of Padova, Padova, Italy; Veneto Institute of Molecular Medicine, Padova, Italy
| | - Dorothy C Bennett
- Molecular and Clinical Sciences Research Institute, St. George's, University of London, London SW17 0RE, UK
| | - Oliver Bischof
- Laboratory of Nuclear Organization and Oncogenesis, Department of Cell Biology and Infection, Inserm U993, Institute Pasteur, Paris, France
| | - Cleo Bishop
- Centre for Cell Biology and Cutaneous Research, Blizard Institute, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, 4 Newark St, London E1 2AT, UK
| | | | - Manuel Collado
- Health Research Institute of Santiago de Compostela (IDIS), Clinical University Hospital (CHUS), Santiago de Compostela, Spain
| | - Konstantinos Evangelou
- Molecular Carcinogenesis Group, Department of Histology and Embryology, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Gerardo Ferbeyre
- Faculty of Medicine, Department of Biochemistry, Université de Montréal and CRCHUM, Montreal, QC, Canada
| | - Jesús Gil
- MRC London Institute of Medical Sciences (LMS), Du Cane Road, London, UK; Institute of Clinical Sciences (ICS), Faculty of Medicine, Imperial College London, Du Cane Road, London, UK
| | - Eiji Hara
- Department of Molecular Microbiology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Valery Krizhanovsky
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Diana Jurk
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
| | - Andrea B Maier
- Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Amsterdam Movement Sciences, Vrije Universiteit, Amsterdam, the Netherlands; Department of Medicine and Aged Care, The Royal Melbourne Hospital, The University of Melbourne, Melbourne, VIC, Australia
| | - Masashi Narita
- Cancer Research UK Cambridge Institute, Li Ka Shing Centre, University of Cambridge, Cambridge CB2 0RE, United Kingdom
| | - Laura Niedernhofer
- Institute on the Biology of Aging and Metabolism, University of Minnesota, MN, USA
| | - João F Passos
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN, USA
| | - Paul D Robbins
- Institute on the Biology of Aging and Metabolism, University of Minnesota, MN, USA
| | - Clemens A Schmitt
- Charité - University Medical Center, Department of Hematology, Oncology and Tumor Immunology, Virchow Campus, and Molekulares Krebsforschungszentrum, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany; Kepler University Hospital, Department of Hematology and Oncology, Johannes Kepler University, Linz, Austria
| | - John Sedivy
- Department of Molecular Biology, Cell Biology and Biochemistry, and Center for the Biology of Aging, Brown University, Providence, RI, USA
| | | | - Thomas von Zglinicki
- Newcastle University Institute for Ageing, Institute for Cell and Molecular Biology, Campus for Ageing and Vitality, Newcastle University, Newcastle upon Tyne NE4 5PL, UK
| | - Daohong Zhou
- Department of Pharmacodynamics, College of Pharmacy, University of Florida, Gainesville, FL, USA
| | - Manuel Serrano
- Catalan Institution for Research and Advanced Studies (ICREA), Barcelona, Spain; Institute for Research in Biomedicine (IRB Barcelona), Barcelona Institute of Science and Technology (BIST), Barcelona, Spain.
| | - Marco Demaria
- University of Groningen (RUG), European Research Institute for the Biology of Aging (ERIBA), University Medical Center Groningen (UMCG), Groningen, the Netherlands.
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6
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Abstract
Spectroscopic ellipsometry was used to characterize vapor-deposited glasses of ethylbenzene (Tg = 115.7 K). For this system, previous calorimetric experiments have established that a transition to the ideal glass state is expected to occur near 101 K (the Kauzmann temperature, TK) if the low-temperature supercooled liquid has the properties expected based upon extrapolation from above Tg. Ethylbenzene glasses were vapor-deposited at substrate temperatures between 100 (∼0.86 Tg) and 116 K (∼Tg), using deposition rates of 0.02-2.1 nm/s. Down to 103 K, glasses prepared in the limit of low deposition rate have densities consistent with the extrapolated supercooled liquid. The highest density glass is within 0.15% of the density expected for the ideal glass. These results support the hypothesis that the extrapolated properties of supercooled ethylbenzene are correct to within just a few Kelvin of TK, consistent with the existence of a phase transition to an ideal glass state at TK.
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Affiliation(s)
- M S Beasley
- Department of Chemistry , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - C Bishop
- Department of Chemistry , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - B J Kasting
- Department of Chemistry , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - M D Ediger
- Department of Chemistry , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
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7
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Zelinski M, Ting A, Bishop C, Lawson M, Liang L, Hobbs T, Jacob D, Lee D. Vitrified macaque ovarian cortical tissue transplanted to heterotopic sites produces fertilizable oocytes. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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8
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Dunlap R, Demmert A, Kieger A, Bishop C, Holly B. Abstract No. 651 Identifying. J Vasc Interv Radiol 2018. [DOI: 10.1016/j.jvir.2018.01.696] [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: 10/17/2022] Open
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9
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Paterson K, Fuller J, Maharaj J, Bishop C. Lower limb symposium. J Sci Med Sport 2017. [DOI: 10.1016/j.jsams.2017.09.197] [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: 10/18/2022]
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10
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Milligan D, Newman J, Caley M, Wainwright L, Jenkins G, Philpott M, Bishop C. 682 Development of a 3D living skin equivalent to explore the influence of senescence on the skin ageing phenotype. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.359] [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: 11/17/2022]
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11
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Clarke RW, Novak P, Zhukov A, Tyler EJ, Cano-Jaimez M, Drews A, Richards O, Volynski K, Bishop C, Klenerman D. Low Stress Ion Conductance Microscopy of Sub-Cellular Stiffness. Soft Matter 2016; 12:7953-8. [PMID: 27604678 PMCID: PMC5166566 DOI: 10.1039/c6sm01106c] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Directly examining subcellular mechanics whilst avoiding excessive strain of a live cell requires the precise control of light stress on very small areas, which is fundamentally difficult. Here we use a glass nanopipet out of contact with the plasma membrane to both exert the stress on the cell and also accurately monitor cellular compression. This allows the mapping of cell stiffness at a lateral resolution finer than 100 nm. We calculate the stress a nanopipet exerts on a cell as the sum of the intrinsic pressure between the tip face and the plasma membrane plus its direct pressure on any glycocalyx, both evaluated from the gap size in terms of the ion current decrease. A survey of cell types confirms that an intracellular pressure of approximately 120 Pa begins to detach the plasma membrane from the cytoskeleton and reveals that the first 0.66 ± 0.09 μm of compression of a neuron cell body is much softer than previous methods have been able to detect.
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Affiliation(s)
- Richard W. Clarke
- University Chemical Laboratories , Lensfield Road , Cambridge , CB2 1EW , UK . ;
| | - Pavel Novak
- School of Engineering and Materials Science , Queen Mary University of London , Mile End Road , London , E1 4NS , UK
| | - Alexander Zhukov
- University Chemical Laboratories , Lensfield Road , Cambridge , CB2 1EW , UK . ;
| | - Eleanor J. Tyler
- Centre for Cell Biology and Cutaneous Research , Queen Mary University of London , 4 Newark Street , London , E1 2AT , UK
| | | | - Anna Drews
- University Chemical Laboratories , Lensfield Road , Cambridge , CB2 1EW , UK . ;
| | - Owen Richards
- University Chemical Laboratories , Lensfield Road , Cambridge , CB2 1EW , UK . ;
| | - Kirill Volynski
- UCL Institute of Neurology , Queen Square , London , WC1N 3BG , UK
| | - Cleo Bishop
- Centre for Cell Biology and Cutaneous Research , Queen Mary University of London , 4 Newark Street , London , E1 2AT , UK
| | - David Klenerman
- University Chemical Laboratories , Lensfield Road , Cambridge , CB2 1EW , UK . ;
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12
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Abstract
A double blind placebo-controlled clinical trial was undertaken to investigate the effect of 500 mg bd of Paroven taken for four weeks on the tissue oxygenation, ankle oedema and calf pump function of 48 patients with chronic venous disease. There was no evidence that Paroven reduced ankle swelling or improved calf pump function, but it did cause a significant improvement in transcutaneous oxygen levels measured in the calf skin of the ulcer hearing area ( p = 0.026) which was confirmed when the oxygen levels of the active and placebo treated groups were compared at the end of four weeks treatment ( p = 0.02). This improvement in tissue oxygenation may be the result of alterations in the capillary exchange produced by the drug and may account for the symptomatic benefit associated with its use.
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Affiliation(s)
- K.G. Burnand
- Department of Surgery, St Thomas' Hospital Medical School, St. Thomas' Hospital, London, SE1 UK
| | - S. Powell
- Department of Surgery, St Thomas' Hospital Medical School, St. Thomas' Hospital, London, SE1 UK
| | - C. Bishop
- Department of Surgery, St Thomas' Hospital Medical School, St. Thomas' Hospital, London, SE1 UK
| | - M. Stacey
- Department of Surgery, St Thomas' Hospital Medical School, St. Thomas' Hospital, London, SE1 UK
| | - T. Pulvertaft
- Department of Surgery, St Thomas' Hospital Medical School, St. Thomas' Hospital, London, SE1 UK
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13
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Murray A, Letourneau A, Canzonetta C, Stathaki E, Gimelli S, Sloan-Bena F, Abrehart R, Goh P, Lim S, Baldo C, Dagna-Bricarelli F, Hannan S, Mortensen M, Ballard D, Syndercombe Court D, Fusaki N, Hasegawa M, Smart TG, Bishop C, Antonarakis SE, Groet J, Nizetic D. Brief report: isogenic induced pluripotent stem cell lines from an adult with mosaic down syndrome model accelerated neuronal ageing and neurodegeneration. Stem Cells 2016; 33:2077-84. [PMID: 25694335 PMCID: PMC4737213 DOI: 10.1002/stem.1968] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [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: 10/12/2014] [Accepted: 01/17/2015] [Indexed: 01/11/2023]
Abstract
Trisomy 21 (T21), Down Syndrome (DS) is the most common genetic cause of dementia and intellectual disability. Modeling DS is beginning to yield pharmaceutical therapeutic interventions for amelioration of intellectual disability, which are currently being tested in clinical trials. DS is also a unique genetic system for investigation of pathological and protective mechanisms for accelerated ageing, neurodegeneration, dementia, cancer, and other important common diseases. New drugs could be identified and disease mechanisms better understood by establishment of well-controlled cell model systems. We have developed a first nonintegration-reprogrammed isogenic human induced pluripotent stem cell (iPSC) model of DS by reprogramming the skin fibroblasts from an adult individual with constitutional mosaicism for DS and separately cloning multiple isogenic T21 and euploid (D21) iPSC lines. Our model shows a very low number of reprogramming rearrangements as assessed by a high-resolution whole genome CGH-array hybridization, and it reproduces several cellular pathologies seen in primary human DS cells, as assessed by automated high-content microscopic analysis. Early differentiation shows an imbalance of the lineage-specific stem/progenitor cell compartments: T21 causes slower proliferation of neural and faster expansion of hematopoietic lineage. T21 iPSC-derived neurons show increased production of amyloid peptide-containing material, a decrease in mitochondrial membrane potential, and an increased number and abnormal appearance of mitochondria. Finally, T21-derived neurons show significantly higher number of DNA double-strand breaks than isogenic D21 controls. Our fully isogenic system therefore opens possibilities for modeling mechanisms of developmental, accelerated ageing, and neurodegenerative pathologies caused by T21.
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Affiliation(s)
- Aoife Murray
- The Blizard Institute, Barts and The London School of Medicine, London, United Kingdom.,The LonDownS Consortium, Wellcome Trust, London, United Kingdom
| | - Audrey Letourneau
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Claudia Canzonetta
- The Blizard Institute, Barts and The London School of Medicine, London, United Kingdom
| | - Elisavet Stathaki
- Service of Genetic Medicine, University Geneva Hospitals, Geneva, Switzerland
| | - Stefania Gimelli
- Service of Genetic Medicine, University Geneva Hospitals, Geneva, Switzerland
| | | | - Robert Abrehart
- The Blizard Institute, Barts and The London School of Medicine, London, United Kingdom
| | - Pollyanna Goh
- The Blizard Institute, Barts and The London School of Medicine, London, United Kingdom.,The LonDownS Consortium, Wellcome Trust, London, United Kingdom
| | - Shuhui Lim
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Chiara Baldo
- Human Genetics Laboratory, Galliera Hospital, Genoa, Italy
| | | | - Saad Hannan
- Department of Neuroscience, Physiology and Pharmacology, University College London, London, United Kingdom
| | - Martin Mortensen
- Department of Neuroscience, Physiology and Pharmacology, University College London, London, United Kingdom
| | - David Ballard
- Department of Forensic and Analytical Science, King's College, London, United Kingdom
| | | | - Noemi Fusaki
- Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Saitama, Japan
| | | | - Trevor G Smart
- Department of Neuroscience, Physiology and Pharmacology, University College London, London, United Kingdom
| | - Cleo Bishop
- The Blizard Institute, Barts and The London School of Medicine, London, United Kingdom
| | - Stylianos E Antonarakis
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Jürgen Groet
- The Blizard Institute, Barts and The London School of Medicine, London, United Kingdom.,Stem Cell Laboratory, National Centre for Bowel Research and Surgical Innovation, Queen Mary University of London, London, United Kingdom.,The LonDownS Consortium, Wellcome Trust, London, United Kingdom
| | - Dean Nizetic
- The Blizard Institute, Barts and The London School of Medicine, London, United Kingdom.,The LonDownS Consortium, Wellcome Trust, London, United Kingdom.,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
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14
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Bishop C, Thewlis D, Hillier S. The effect of custom foot orthotics and footwear on first-step pain in people with plantar heel pain: A pragmatic randomized controlled trial. J Sci Med Sport 2015. [DOI: 10.1016/j.jsams.2015.12.436] [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: 10/22/2022]
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15
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Lindenbach D, Conti MM, Ostock CY, Dupre KB, Bishop C. Alterations in primary motor cortex neurotransmission and gene expression in hemi-parkinsonian rats with drug-induced dyskinesia. Neuroscience 2015; 310:12-26. [PMID: 26363150 DOI: 10.1016/j.neuroscience.2015.09.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 08/20/2015] [Accepted: 09/04/2015] [Indexed: 02/05/2023]
Abstract
Treatment of Parkinson's disease (PD) with dopamine replacement relieves symptoms of poverty of movement, but often causes drug-induced dyskinesias. Accumulating clinical and pre-clinical evidence suggests that the primary motor cortex (M1) is involved in the pathophysiology of PD and that modulating cortical activity may be a therapeutic target in PD and dyskinesia. However, surprisingly little is known about how M1 neurotransmitter tone or gene expression is altered in PD, dyskinesia or associated animal models. The present study utilized the rat unilateral 6-hydroxydopamine (6-OHDA) model of PD/dyskinesia to characterize structural and functional changes taking place in M1 monoamine innervation and gene expression. 6-OHDA caused dopamine pathology in M1, although the lesion was less severe than in the striatum. Rats with 6-OHDA lesions showed a PD motor impairment and developed dyskinesia when given L-DOPA or the D1 receptor agonist, SKF81297. M1 expression of two immediate-early genes (c-Fos and ARC) was strongly enhanced by either L-DOPA or SKF81297. At the same time, expression of genes specifically involved in glutamate and GABA signaling were either modestly affected or unchanged by lesion and/or treatment. We conclude that M1 neurotransmission and signal transduction in the rat 6-OHDA model of PD/dyskinesia mirror features of human PD, supporting the utility of the model to study M1 dysfunction in PD and the elucidation of novel pathophysiological mechanisms and therapeutic targets.
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Affiliation(s)
- D Lindenbach
- Behavioral Neuroscience Program, Department of Psychology, Binghamton University - State University of New York, Binghamton, NY, USA
| | - M M Conti
- Behavioral Neuroscience Program, Department of Psychology, Binghamton University - State University of New York, Binghamton, NY, USA
| | - C Y Ostock
- Behavioral Neuroscience Program, Department of Psychology, Binghamton University - State University of New York, Binghamton, NY, USA
| | - K B Dupre
- Behavioral Neuroscience Program, Department of Psychology, Binghamton University - State University of New York, Binghamton, NY, USA
| | - C Bishop
- Behavioral Neuroscience Program, Department of Psychology, Binghamton University - State University of New York, Binghamton, NY, USA.
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16
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Moore M, Philpott M, Bishop C. A siRNA screen to re-activate senescence in basal-like breast cancer. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv117.14] [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: 11/14/2022] Open
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17
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Affiliation(s)
- SD Hill
- Human–Wildlife Interactions Research Group, Institute of Natural Sciences, Massey University, Auckland, New Zealand
| | - C Bishop
- Research Investigations and Monitoring Unit, Auckland Council, Auckland, New Zealand
| | - TJ Landers
- Research Investigations and Monitoring Unit, Auckland Council, Auckland, New Zealand
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Bishop C, May T, Arnold J. In pursuit of foot orthotic success: Can we identify biomechanical responses in the clinic? J Sci Med Sport 2014. [DOI: 10.1016/j.jsams.2014.11.063] [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]
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Lindenbach D, Palumbo N, Ostock CY, Vilceus N, Conti MM, Bishop C. Side effect profile of 5-HT treatments for Parkinson's disease and L-DOPA-induced dyskinesia in rats. Br J Pharmacol 2014; 172:119-30. [PMID: 25175895 DOI: 10.1111/bph.12894] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 07/18/2014] [Accepted: 08/26/2014] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND AND PURPOSE Treatment of Parkinson's disease (PD) with L-DOPA eventually causes abnormal involuntary movements known as dyskinesias in most patients. Dyskinesia can be reduced using compounds that act as direct or indirect agonists of the 5-HT1 A receptor, but these drugs have been reported to worsen PD features and are known to produce '5-HT syndrome', symptoms of which include tremor, myoclonus, rigidity and hyper-reflexia. EXPERIMENTAL APPROACH Sprague-Dawley rats were given unilateral nigrostriatal dopamine lesions with 6-hydroxydopamine. Each of the following three purportedly anti-dyskinetic 5-HT compounds were administered 15 min before L-DOPA: the full 5-HT1 A agonist ±-8-hydroxy-2-dipropylaminotetralin (±8-OH-DPAT), the partial 5-HT1 A agonist buspirone or the 5-HT transporter inhibitor citalopram. After these injections, animals were monitored for dyskinesia, 5-HT syndrome, motor activity and PD akinesia. KEY RESULTS Each 5-HT drug dose-dependently reduced dyskinesia by relatively equal amounts (±8-OH-DPAT ≥ citalopram ≥ buspirone), but 5-HT syndrome was higher with ±8-OH-DPAT, lower with buspirone and not present with citalopram. Importantly, with or without L-DOPA, all three compounds provided an additional improvement of PD akinesia. All drugs tempered the locomotor response to L-DOPA suggesting dyskinesia reduction, but vertical rearing was reduced with 5-HT drugs, potentially reflecting features of 5-HT syndrome. CONCLUSIONS AND IMPLICATIONS The results suggest that compounds that indirectly facilitate 5-HT1 A receptor activation, such as citalopram, may be more effective therapeutics than direct 5-HT1 A receptor agonists because they exhibit similar anti-dyskinesia efficacy, while possessing a reduced side effect profile.
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Affiliation(s)
- D Lindenbach
- Behavioral Neuroscience Program, Department of Psychology, Binghamton University - State University of New York, Binghamton, NY, USA
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Mankodi A, Janiczek R, Froeling M, Azzabou N, Gaur L, Stock D, Evers R, Bishop C, Yao L, Grunseich C, Arai A, Carlier P, Fischbeck K. G.O.10. Neuromuscul Disord 2014. [DOI: 10.1016/j.nmd.2014.06.198] [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: 10/24/2022]
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21
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Bishop C, Sweeting K. Foot and ankle taping for a purpose. J Sci Med Sport 2013. [DOI: 10.1016/j.jsams.2013.10.203] [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]
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Pustam A, Smith C, Deering C, Grosicki KMT, Leng TY, Lin S, Yang J, Pink D, Gill T, Graham L, Derksen D, Bishop C, Demont ME, Wyeth RC, Smith-Palmer T. Interactions of protamine with the marine bacterium, Pseudoalteromonas sp. NCIMB 2021. Lett Appl Microbiol 2013; 58:225-30. [PMID: 24138125 DOI: 10.1111/lam.12177] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 10/11/2013] [Accepted: 10/14/2013] [Indexed: 11/27/2022]
Abstract
UNLABELLED Pseudoalteromonas sp. NCIMB 2021 (NCIMB 2021) was grown in synthetic seawater (SSW) containing pyruvate, in the presence (SSW(++) ) and absence (SSW(-) ) of divalent cations. Cultures contained single cells. Addition of the cationic antibacterial peptide (CAP), protamine, did not inhibit, but rather increased, the growth of NCIMB 2021 in SSW(++) and caused the bacteria to grow in chains. Bacterial growth was assessed using turbidity, cell counts and the sodium salt of resazurin. In SSW(-) , NCIMB 2021 was no longer resistant to protamine. The minimum inhibitory concentration (MIC) was 5 mg ml(-1) . SIGNIFICANCE AND IMPACT OF THE STUDY Protamine is a cationic antimicrobial peptide (CAP), which is active against a variety of bacteria. This is the first in-depth study of the interaction of protamine with a marine bacterium, Pseudoalteromonas sp. NCIMB 2021. Our results show that protamine is only active in seawater in the absence of divalent cations. In the presence of the divalent cations, Mg(2+) and Ca(2+) , protamine enhances the growth of Pseudoalteromonas sp. NCIMB 2021 and produces chains rather than individual cells. These are important considerations when deciding on applications for protamine and in terms of understanding its mechanism of action.
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Affiliation(s)
- A Pustam
- Chemistry Department, St Francis Xavier University, Antigonish, NS, Canada; Centre for Biofouling Research, St Francis Xavier University, Antigonish, NS, Canada
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Qiu Z, Wei L, Liu J, Sochacki KR, Liu X, Bishop C, Ebraheim M, Yang H. Effect of intermittent PTH (1-34) on posterolateral spinal fusion with iliac crest bone graft in an ovariectomized rat model. Osteoporos Int 2013; 24:2693-700. [PMID: 23756875 DOI: 10.1007/s00198-013-2385-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Accepted: 03/13/2013] [Indexed: 10/26/2022]
Abstract
SUMMARY Intermittent treatment with high-dose parathyroid hormone (PTH) enhances the quantity and quality of the fusion callus and reduces healing time of posterolateral spinal fusion with autologous iliac bone grafts in ovariectomized osteoporotic female Sprague-Dawley rats. Intermittent PTH (1-34) could be an appropriate adjunctive therapy for osteoporotic patients undergoing posterolateral intertransverse process fusion. INTRODUCTION The study was designed to test the hypothesis that intermittent administration of PTH improves spinal fusion rates in a randomized controlled, ovariectomized osteoporotic rat spinal fusion model. METHODS Thirty-six 10-week-old Sprague-Dawley rats were ovariectomized and underwent bilateral posterolateral L4-L5 spinal fusion with autologous iliac bone graft 6 weeks later. The experimental (PTH) group (18 rats) received daily subcutaneously administered injections of PTH (1-34) at 30 μg/kg/day starting on the day of operation. The control group (18 rats) received a subcutaneously administered injection of normal saline of the same volume. Nine rats from each group were sacrificed at 4 and 6 weeks. After sacrifice, the L4-L5 vertebral segments were removed and analyzed by plain radiographs, μ-CT, histomorphometry, and serum bone metabolism marker. RESULTS The PTH group had a significantly higher fusion rate and X-ray fusion score than the control group at 4 and 6 weeks (p < 0.05). μ-CT and histological analysis showed that the fusion bone volume and cortical thickness for the PTH group were significantly higher than those for the control group at 4 and 6 weeks (p < 0.05). Metabolic marker analysis also showed significant difference between the two groups. The serum osteocalcin was significantly higher in the PTH group at 4 and 6 weeks, and levels of N-terminal peptide of type I collagen were significantly higher at 4 weeks (p < 0.05). CONCLUSION Intermittent treatment with high-dose PTH enhances the quantity of the fusion callus and reduces the healing time of posterolateral spinal fusion with autologous iliac bone grafts in ovariectomized osteoporotic female Sprague-Dawley rats.
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Affiliation(s)
- Z Qiu
- The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, Jiangsu, 215006, China
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Bishop C, Kinchington M, Clark R. Symposium. J Sci Med Sport 2012. [DOI: 10.1016/j.jsams.2012.11.801] [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]
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Lee D, Ting A, Thomas C, Bishop C, Xu F, Zelinski M. Heterotopic transplants of vitrified ovarian tissue in macaques: assessment of follicular function, embryonic development and a novel microbubble assay for blood flow. Fertil Steril 2012. [DOI: 10.1016/j.fertnstert.2012.07.248] [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: 10/28/2022]
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Ambler G, Boyle J, Cousins C, Hayes P, Metha T, See T, Varty K, Winterbottom A, Adam D, Bradbury A, Clarke M, Jackson R, Rose J, Sharif A, Wealleans V, Williams R, Wilson L, Wyatt M, Ahmed I, Bell R, Carrell T, Gkoutzios P, Sabharwal T, Salter R, Waltham M, Bicknell C, Bourke P, Cheshire N, Franklin I, James A, Jenkins M, Tyrrell M, Wilkins C, Bown M, Choke E, McCarthy M, Sayers R, Tamberaja A, Farquharson F, Serracino-Inglott F, Davis M, Hamilton G, Brennan J, Canavati R, Fisher R, McWilliams R, Naik J, Vallabhaneni S, Hardman J, Black S, Hinchliffe R, Holt P, Loftus I, Loosemore T, Morgan R, Thompson M, Agu O, Bishop C, Boardley D, Cross J, Hague J, Harris P, Ivancev K, Raja J, Richards T, Simring D, Fisher A, Smith D, Copeland G. Early Results of Fenestrated Endovascular Repair of Juxtarenal Aortic Aneurysms in the United Kingdom. Circulation 2012; 125:2707-15. [PMID: 22665884 DOI: 10.1161/circulationaha.111.070334] [Citation(s) in RCA: 129] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
| | | | | | | | - T. Metha
- Addenbrooke's Hospital, Cambridge
| | - T.C. See
- Addenbrooke's Hospital, Cambridge
| | - K. Varty
- Addenbrooke's Hospital, Cambridge
| | | | - D.J. Adam
- Birmingham Heartlands Hospital, Birmingham
| | | | | | | | - J.D. Rose
- Freeman Hospital, Newcastle upon Tyne
| | - A. Sharif
- Freeman Hospital, Newcastle upon Tyne
| | | | | | - L. Wilson
- Freeman Hospital, Newcastle upon Tyne
| | | | - I. Ahmed
- Guy's & St. Thomas' Hospital, London
| | - R.E. Bell
- Guy's & St. Thomas' Hospital, London
| | | | | | | | - R. Salter
- Guy's & St. Thomas' Hospital, London
| | | | | | | | | | | | - A. James
- Imperial College Hospitals, London
| | | | | | | | - M. Bown
- Leicester Royal Infirmary, Leicester
| | - E. Choke
- Leicester Royal Infirmary, Leicester
| | | | - R. Sayers
- Leicester Royal Infirmary, Leicester
| | | | | | | | | | | | | | - R. Canavati
- Royal Liverpool University Hospital, Liverpool
| | - R.K. Fisher
- Royal Liverpool University Hospital, Liverpool
| | | | - J.B. Naik
- Royal Liverpool University Hospital, Liverpool
| | | | | | | | | | - P. Holt
- St. George's Hospital, London
| | | | | | | | | | - O. Agu
- University College London Hospital, London
| | - C. Bishop
- University College London Hospital, London
| | | | - J. Cross
- University College London Hospital, London
| | - J. Hague
- University College London Hospital, London
| | | | - K. Ivancev
- University College London Hospital, London
| | - J. Raja
- University College London Hospital, London
| | | | - D. Simring
- University College London Hospital, London
| | - A.C. Fisher
- Globalstar on-line database IT support, University of Liverpool, Liverpool
| | - D. Smith
- Globalstar on-line database IT support, University of Liverpool, Liverpool
| | - G.P. Copeland
- POSSUM advice, Warrington General Hospital, Warrington
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Eskow Jaunarajs KL, George JA, Bishop C. L-DOPA-induced dysregulation of extrastriatal dopamine and serotonin and affective symptoms in a bilateral rat model of Parkinson's disease. Neuroscience 2012; 218:243-56. [PMID: 22659568 DOI: 10.1016/j.neuroscience.2012.05.052] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 05/21/2012] [Accepted: 05/21/2012] [Indexed: 12/17/2022]
Abstract
Convergent evidence indicates that raphestriatal serotonin (5-HT) neurons can convert and release dopamine (DA) derived from exogenous administration of the pharmacotherapeutic L-3,4-dihydroxyphenyl-L-alanine (L-DOPA) as a treatment for Parkinson's disease (PD). While aspects of such neuroplasticity may be beneficial, chronic L-DOPA may also modify native 5-HT function, precipitating the appearance prevalent non-motor PD symptoms such as anxiety and depression. To examine this, male Sprague-Dawley rats were rendered parkinsonian with bilateral medial forebrain bundle 6-hydroxydopamine (6-OHDA) infusions and treated for at least 28 days with vehicle or L-DOPA. In the first experiment, striatal, hippocampal, amygdalar, and prefrontal cortex DA and 5-HT levels were examined at various post-treatment time-points. In experiment 2, L-DOPA's effects on DA and 5-HT cell bodies in the substantia nigra pars compacta and dorsal raphe, respectively, were examined. Finally, the effects of L-DOPA on affective behaviors were assessed in locomotor chambers, social interaction, forced swim, and elevated plus maze behavioral tests. Bilateral 6-OHDA lesion induced approximately 80% DA and 30% 5-HT depletion in the striatum compared to sham-lesioned controls, while monoamine levels remained largely unchanged in extrastriatal regions. Tissue levels of DA were increased at the expense of 5-HT levels in parkinsonian rats subjected to chronic L-DOPA injections in all regions sampled, though DA or 5-HT cell bodies were unaffected. Behaviorally, rats could only be tested 24h after their last L-DOPA injection due to severe dyskinesia. Despite this, prior exposure to chronic L-DOPA treatment exerted a pronounced anxiogenic phenotype. Collectively, these results suggest that chronic L-DOPA treatment may interfere with the balance of DA and 5-HT function in affect-related brain regions and could induce and/or exacerbate non-motor symptoms in PD.
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Affiliation(s)
- K L Eskow Jaunarajs
- Behavioral Neuroscience Program, Department of Psychology, State University of New York at Binghamton, Binghamton, NY 13902-6000, USA
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Mason R, Fearnley N, Bishop C, Möller T, Giorgini F. B03 Identification and characterisation of overexpression suppressors of mutant huntingtin toxicity. J Neurol Neurosurg Psychiatry 2010. [DOI: 10.1136/jnnp.2010.222596.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Stade BC, Camera S, Watson W, Bennett D, Bishop C, Sgro M. Fetal Alcohol Spectrum Disorder Diagnostic Telemedicine Program: Measurement of Cost and Client Satisfaction. Paediatr Child Health 2010. [DOI: 10.1093/pch/15.suppl_a.14ab] [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: 11/12/2022] Open
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Barnum CJ, Eskow KL, Dupre K, Blandino P, Deak T, Bishop C. Exogenous corticosterone reduces L-DOPA-induced dyskinesia in the hemi-parkinsonian rat: role for interleukin-1beta. Neuroscience 2008; 156:30-41. [PMID: 18687386 DOI: 10.1016/j.neuroscience.2008.07.016] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2008] [Revised: 06/18/2008] [Accepted: 07/08/2008] [Indexed: 10/21/2022]
Abstract
While the etiology of Parkinson's disease (PD) remains unknown, there is overwhelming evidence that neuroinflammation plays a critical role in the progressive loss of dopamine (DA) neurons. Because nearly all persons suffering from PD receive l-DOPA, it is surprising that inflammation has not been examined as a potential contributor to the abnormal involuntary movements (AIMs) that occur as a consequence of chronic l-DOPA treatment. As an initial test of this hypothesis, we examined the effects of exogenously administered corticosterone (CORT), an endogenous anti-inflammatory agent, on the expression and development of l-DOPA-induced dyskinesia (LID) in unilateral DA-depleted rats. To do this, male Sprague-Dawley rats received unilateral medial forebrain bundle 6-hydroxydopamine lesions. Three weeks later, l-DOPA primed rats received acute injections of CORT (0-3.75 mg/kg) prior to l-DOPA to assess the expression of LID. A second group of rats was used to examine the development of LID in l-DOPA naïve rats co-treated with CORT and l-DOPA for 2 weeks. AIMs and rotations were recorded. Exogenous CORT dose-dependently attenuated both the expression and development of AIMs without affecting rotations. Real-time reverse-transcription polymerase chain reaction of striatal tissue implicated a role for interleukin-1 (IL-1) beta in these effects as its expression was increased on the lesioned side in rats treated with l-DOPA (within the DA-depleted striatum) and attenuated with CORT. In the final experiment, interleukin-1 receptor antagonist (IL-1ra) was microinjected into the striatum of l-DOPA-primed rats to assess the impact of IL-1 signaling on LID. Intrastriatal IL-1ra reduced the expression of LID without affecting rotations. These findings indicate a novel role for neuroinflammation in the expression of LID, and may implicate the use of anti-inflammatory agents as a potential adjunctive therapy for the treatment of LID.
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Affiliation(s)
- C J Barnum
- Behavioral Neuroscience Program, Department of Psychology, State University of New York at Binghamton, 4400 Vestal Parkway East, Binghamton, NY 13902, USA
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Dassan P, Brown M, Bishop C, Hopkins I, Werring D. A Case of Presumed Granulomatous Carotid Stenosis. Cerebrovasc Dis 2008; 25:380-1. [DOI: 10.1159/000120690] [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: 11/19/2022] Open
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Bishop C, Trathan P, MacLean G, Brown P. Novel GPS tags reveal fine-scale foraging movements of marine predators over extended time periods. Comp Biochem Physiol A Mol Integr Physiol 2007. [DOI: 10.1016/j.cbpa.2007.01.116] [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: 11/27/2022]
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Kovanci E, Amato P, Buster J, Simpson J, Bishop C, Carson S. P-688. Fertil Steril 2006. [DOI: 10.1016/j.fertnstert.2006.07.1070] [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]
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Kovanci E, Amato P, Rohozinski J, Bishop C, Simpson J, Carson S. P103S Missense Mutation in a Highly Conserved Region of Growth Differentiating Factor - 9 (GDF-9): Single Abnormality Among 62 Women With Premature Ovarian Failure. Fertil Steril 2005. [DOI: 10.1016/j.fertnstert.2005.07.024] [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: 10/25/2022]
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Pai M, Jamal W, Mosse A, Bishop C, Bown S, McEwan J. Inhibition of in-stent restenosis in rabbit iliac arteries with photodynamic therapy. Eur J Vasc Endovasc Surg 2005; 30:573-81. [PMID: 16125418 DOI: 10.1016/j.ejvs.2005.07.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2005] [Accepted: 07/05/2005] [Indexed: 11/18/2022]
Abstract
OBJECTIVES Photodynamic therapy (PDT, the combination of light with a photosensitising drug in the presence of oxygen) inhibits restenosis after angioplasty without stenting. This study assesses the potential of PDT for prevention of in-stent re-stenosis. DESIGN AND METHODS Normal rabbits were given the photosensitising agent 5-aminolaevulinic acid (ALA) 60 mg/kg, 3 h prior to endovascular illumination of the iliac artery (635 nm at 50 J/cm(2)) either immediately before or after deployment of an oversized (3 mm diameter) stent. PDT treated arteries were retrieved 3 or 28 days later and assessed for cell counts and vascular morphometry. Control arteries (stent but no PDT) were examined at 28 days. RESULTS There were no adverse events and all vessels were patent at the end of the study. At 3 days there was almost complete medial cell ablation when light was delivered before stent deployment (17+/-1 cells/hpf), with little effect when illumination followed stent deployment (184+/-17 cells/hpf, p<0.0001). Twenty-eight days after PDT, the neointimal areas were 1.41+/-0.52 mm(2) (stent with no PDT), 1.24+/-0.54 mm(2) (light after stent) and 0.60+/-0.21 mm(2) (light before stent) (p=0.004). CONCLUSIONS PDT before stent deployment caused almost complete medial cell ablation at 3 days with inhibition of in-stent restenosis at 28 days. PDT is worthy of further study as an adjuvant to percutaneous intervention in patients with vascular disease.
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MESH Headings
- Aminolevulinic Acid/administration & dosage
- Aminolevulinic Acid/therapeutic use
- Animals
- Arterial Occlusive Diseases/surgery
- Blood Vessel Prosthesis Implantation/instrumentation
- Disease Models, Animal
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/pathology
- Graft Occlusion, Vascular/drug therapy
- Graft Occlusion, Vascular/pathology
- Iliac Artery
- Injections, Intra-Arterial
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/pathology
- Photochemotherapy/methods
- Photosensitizing Agents/administration & dosage
- Photosensitizing Agents/therapeutic use
- Prosthesis Failure
- Rabbits
- Stents
- Treatment Outcome
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Affiliation(s)
- M Pai
- The Royal Free and University College London Medical School, London, UK
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Bishop C, Walker PD. Combined intrastriatal dopamine D1 and serotonin 5-HT2 receptor stimulation reveals a mechanism for hyperlocomotion in 6-hydroxydopamine-lesioned rats. Neuroscience 2004; 121:649-57. [PMID: 14568025 DOI: 10.1016/s0306-4522(03)00516-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [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: 11/24/2022]
Abstract
Loss of dopaminergic innervation to the striatum increases the sensitivity of dopamine (DA) D1 and serotonin (5-HT) 5-HT2 receptor signaling. Previous work from our laboratory has shown that systemic co-administration of D1 and 5-HT2 receptor agonists leads to the synergistic overexpression of striatal preprotachykinin mRNA levels in the DA-depleted, but not intact animals. In the present study, we examined this mechanism as related to locomotor behavior. Adult male Sprague-Dawley rats were subject to bilateral i.c.v. 6-hydroxydopamine (6-OHDA; 200 microg in 10 microl/side) or vehicle (0.9% saline and 0.1% ascorbic acid). After 3 weeks, rats were tested for locomotor responses to bilateral intrastriatal infusions of vehicle (0.9% NaCl), the D1 agonist SKF82958 [(+/-)6-chloro-7,8-dihydroxy-3-allyl-1-phenyl-2,3,4,5-tetra-hydro-(1H)-3-benzazepine hydrobromide; 0.1, 1.0 or 10.0 microg/side], the 5-HT2 agonist DOI [(+/-)-1-(4-iodo-2,5-dimethoxyphenyl)-2-aminopropane; 0.1, 1.0 or 10.0 microg/side] or subthreshold doses of DOI and SKF82958 (0.1 microg+0.1 microg in 0.8 microl/side). Rats with DA loss demonstrated supersensitive locomotor responses to SKF82958, but not DOI. Combined administration of subthreshold SKF82958 and DOI doses (0.1 microg+0.1 microg) synergistically increased locomotor behavior only in 6-OHDA-lesioned rats. These effects were blocked by either the D1 antagonist SCH23390 3-methyl-1-phenyl-2,3,4,5-tetrahydro-7-chloro-8-hydroxy-(1H)-3-benzazepine or the 5-HT2 antagonist ritanserin (each 1.0 microg in 0.8 microl/side). The results of this study suggest that the behavioral synergy induced by local co-stimulation of D1 and 5-HT2 receptors within the 6-OHDA-lesioned striatum may lead to hyperkinesias that can occur with continued pharmacological treatment of Parkinson's disease.
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Affiliation(s)
- C Bishop
- Department of Anatomy and Cell Biology, Wayne State University, School of Medicine, Detroit, MI 48201, USA
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Bishop C, Salahudeen AK. 360 CARBON MONOXIDE (CO), A HEME OXYGENASE-1 (HO-1) BYPRODUCT, DOES NOT PREVENT COLD-REWARM-ASSOCIATED HUMAN RENAL PROXIMAL TUBULAR EPITHELIAL (RPTE) CELL DEATH. J Investig Med 2004. [DOI: 10.1136/jim-52-suppl1-913] [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: 11/04/2022]
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Jefferies A, Stade B, Bishop C, Buller K, Zielonka J, Barozzino T. A Family Focused Clinical Pathway Decreases Length of Stay in a Level 2 Newborn Centre. Paediatr Child Health 2003. [DOI: 10.1093/pch/8.suppl_b.40b] [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: 11/13/2022] Open
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41
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Pai M, Mansfield R, Moss S, Raphael M, Brooks J, Bown S, McEwan J, Bishop C. Vascular 17. Br J Surg 2002. [DOI: 10.1046/j.1365-2168.89.s.1.13_5.x] [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: 11/20/2022]
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42
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Currie PJ, Coscina DV, Bishop C, Coiro CD, Koob GF, Rivier J, Vale W. Hypothalamic paraventricular nucleus injections of urocortin alter food intake and respiratory quotient. Brain Res 2001; 916:222-8. [PMID: 11597609 DOI: 10.1016/s0006-8993(01)02851-7] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [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: 11/15/2022]
Abstract
Corticotropin releasing hormone (CRH) acts on the central nervous system to alter energy balance and influence both food intake and sympathetically-mediated thermogenesis. CRH is also reported to inhibit food intake in several models of hyperphagia including neuropeptide Y (NPY)-induced eating. The recently identified CRH-related peptide, urocortin (UCN), also binds with high affinity to CRH receptor subtypes and decreases food intake in food-deprived and non-deprived rats. The present experiment characterized further the feeding and metabolic effects of UCN by examining its impact after direct injections into the paraventricular nucleus (PVN) of the hypothalamus. In feeding tests (n=8), UCN (50-200 pmol) was injected into the PVN at the onset of the dark cycle and food intake was measured 1, 2 and 4 h postinjection. In separate rats (n=8), the metabolic effects of UCN were monitored using an open circuit calorimeter which measured oxygen consumption (V(O2)) and carbon dioxide production (V(CO2)). Respiratory quotient (RQ) was calculated as V(CO2)/V(O2). UCN suppressed feeding at all times studied and reliably decreased RQ within 30 min of infusion. Additional work examined the effect of UCN (50-100 pmol) pretreatment on the feeding and metabolic effects of NPY. NPY, injected at the start of the dark period, reliably increased 2 h food intake. This effect was blocked by PVN UCN administration. Similarly, UCN blocked the increase in RQ elicited by NPY alone. These results suggest that UCN-sensitive mechanisms within the PVN may modulate food intake and energy substrate utilization, possibly through an interaction with hypothalamic NPY.
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Affiliation(s)
- P J Currie
- Department of Psychology, Barnard College, Columbia University, New York, NY 10027, USA.
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43
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Abstract
Food intake in rats and other mammals is lowest at estrus and highest at diestrus. While much is known about the effects of different estrous phases on energy intake, as well as some of the metabolic effects the associated hormones exert, little has been reported about changes in whole-body metabolism that accompany those phases. This study investigates how energy expenditure (EE) and respiratory quotient (RQ) vary in intact female Sprague-Dawley rats (n=12) tested mid-light cycle over 2 h on days associated with estrus vs. diestrus. Rats showed small but reliable decreases in body weight on days associated with estrus, but not diestrus. EE was significantly increased by approximately 21% on the day associated with estrus compared to diestrus. At the same time, RQ was significantly decreased by approximately 7% on the day associated with estrus, indicating a relative shift to fat over carbohydrate as the energy substrate to support energetic needs. Future investigations of ingestive processes can integrate the present findings to investigate how gender differences in feeding and metabolism contribute to regulatory behaviors.
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Affiliation(s)
- G C Parker
- Department of Psychology, Wayne State University, 71 West Warren Avenue, Detroit, MI 48202, USA.
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44
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Mazeyrat S, Saut N, Grigoriev V, Mahadevaiah SK, Ojarikre OA, Bishop C, Eicher EM, Mitchell MJ, Burgoyne PS. A Y-encoded subunit of the translation initiation factor Eif2 is essential for mouse spermatogenesis. Nat Genet 2001; 29:49-53. [PMID: 11528390 DOI: 10.1038/ng717] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.2] [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: 02/02/2023]
Abstract
In mouse and man, deletions of specific regions of the Y chromosome have been linked to early failure of spermatogenesis and consequent sterility; the Y chromosomal gene(s) with this essential early role in spermatogenesis have not been identified. The partial deletion of the mouse Y short arm (the Sxrb deletion) that occurred when Tp(Y)1CtSxr-b (hereafter Sxrb) arose from Tp(Y)1CTSxr-b (hereafter Sxra) defines Spy, a Y chromosomal factor essential for normal spermatogonial proliferation. Molecular analysis has identified six genes that lie within the deletion: Ube1y1 (refs. 4,5), Smcy, Uty, Usp9y (also known as Dffry), Eif2s3y (also known as Eif-2gammay) and Dby10; all have closely similar X-encoded homologs. Of the Y-encoded genes, Ube1y1 and Dby have been considered strong candidates for mouse Spy function, whereas Smcy has been effectively ruled out as a candidate. There is no Ube1y1 homolog in man, and DBY, either alone or in conjunction with USP9Y, is the favored candidate for an early spermatogenic role. Here we show that introduction of Ube1y1 and Dby as transgenes into Sxrb-deletion mice fails to overcome the spermatogenic block. However, the introduction of Eif2s3y restores normal spermatogonial proliferation and progression through meiotic prophase. Therefore, Eif2s3y, which encodes a subunit of the eukaryotic translation initiation factor Eif2, is Spy.
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Affiliation(s)
- S Mazeyrat
- Division of Developmental Genetics, MRC National Institute for Medical Research, Mill Hill, London NW7 1AA, UK
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45
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Zhang J, DeYoung A, Kasler HG, Kabra NH, Kuang AA, Diehl G, Sohn SJ, Bishop C, Winoto A. Receptor-mediated apoptosis in T lymphocytes. Cold Spring Harb Symp Quant Biol 2001; 64:363-71. [PMID: 11232309 DOI: 10.1101/sqb.1999.64.363] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- J Zhang
- University of California, Department of Molecular and Cell Biology, Division of Immunology and Cancer Research Laboratory, 469 LSA, Berkeley, California 94720-3200, USA
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46
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Abstract
According to the duplex theory of tactile texture perception, detection of cutaneous vibrations produced when the exploring finger moves across a surface contributes importantly to the perception of fine textures. If this is true, a vibrating surface should feel different from a stationary one. To test this prediction, experiments were conducted in which subjects examined two identical surfaces, one of which was surreptitiously made to vibrate, and judged which of the two was smoother. In experiment 1, the vibrating surface was less and less often judged smoother as the amplitude of (150 Hz) vibration increased. The effect was comparable in subjects who realized the surface was vibrating and those who did not. Experiment 2 showed that different frequencies (150-400 Hz) were equally effective in eliciting the effect when equated in sensation level (dB SL). The results suggest that vibrotaction contributes to texture perception, and that, at least within the Pacinian channel, it does so by means of an intensity code.
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Affiliation(s)
- M Hollins
- Department of Psychology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
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47
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Gellner K, Eiselt R, Hustert E, Arnold H, Koch I, Haberl M, Deglmann CJ, Burk O, Buntefuss D, Escher S, Bishop C, Koebe HG, Brinkmann U, Klenk HP, Kleine K, Meyer UA, Wojnowski L. Genomic organization of the human CYP3A locus: identification of a new, inducible CYP3A gene. Pharmacogenetics 2001; 11:111-21. [PMID: 11266076 DOI: 10.1097/00008571-200103000-00002] [Citation(s) in RCA: 168] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Proteins encoded by the human CYP3A genes metabolize every second drug currently in use. The activity of CYP3A gene products in the general population is highly variable and may affect the efficacy and safety of drugs metabolized by these enzymes. The mechanisms underlying this variability are poorly understood, but they include gene induction, protein inhibition and unknown genetic polymorphisms. To better understand the regulation of CYP3A expression and to provide a basis for a screen of genetic polymorphisms, we determined and analysed the sequence of the human CYP3A locus. The 231 kb locus sequence contains the three CYP3A genes described previously (CYP3A4, CYP3A5 and CYP3A7), three pseudogenes as well as a novel CYP3A gene termed CYP3A43. The gene encodes a putative protein with between 71.5% and 75.8% identity to the other CYP3A proteins. The highest expression level of CYP3A43 mRNA is observed in the prostate, an organ with extensive steroid metabolism. CYP3A43 is also expressed in several other tissues including liver, where it can be induced by rifampicin. CYP3A43 transcripts undergo extensive splicing. The identification of a new member of the CYP3A family and the characterization of the full CYP3A locus will aid efforts to identify the genetic variants underlying its variable expression. This, in turn, will lead to a better optimization of therapies involving the numerous substrates of CYP3A proteins.
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Affiliation(s)
- K Gellner
- Epidauros Biotechnologie AG, Bernried, Germany
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48
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Abstract
Injections of the serotonin (5-HT)(1A) agonist, 8-hydroxy-2(di-n-propylamino)tetralin, (8-OH-DPAT), either systemically or into the midbrain raphe nuclei, elicit food intake in otherwise satiated rats. Lesions of the paraventricular nucleus of the hypothalamus are well known for producing long-term overeating, but past research has excluded this site as a potential locus for short-term 8-OH-DPAT feeding effects. More recent work shows that small lesions of the posterodorsal amygdala (PDA) elicit overeating in their own right. Since this and related regions of the amygdala receive 5-HT innervations from the dorsal raphe nucleus (DRN), we determined if PDA lesions might alter feeding after injecting 8-OH-DPAT into this midbrain region. Adult female rats received either bilateral electrolytic lesions of the PDA or sham lesions. After recording weight gains for over 1 month, all rats were implanted with DRN cannulae, then randomly tested every 3-4 days for 1 h intake of standard lab chow after 0, 0.4, 0.8 or 1.6 nmol injections of 8-OH-DPAT. Additional 90 min measures of intake were also made after 0 vs. 250 microg (760 nmol) 8-OH-DPAT s.c. At the two highest DRN doses tested, lesioned rats showed 50% less intake compared to shams. A similar profile emerged after the single s.c. dose. These results suggest that the PDA may be an important locus at which reduced release of endogenous 5-HT stimulates feeding. Alternatively, the PDA may represent part of a larger brain circuit whose integrity is necessary for eliciting intake in response to a variety of feeding stimuli.
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Affiliation(s)
- D V Coscina
- Department of Psychology, Wayne State University, 71 W. Warren Ave., Detroit, MI 48202, USA.
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49
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Horst R, Prapong S, Reinhardt T, Koszewski N, Knutson J, Bishop C. Comparison of the relative effects of 1,24-dihydroxyvitamin D(2) [1, 24-(OH)(2)D(2)], 1,24-dihydroxyvitamin D(3) [1,24-(OH)(2)D(3)], and 1,25-dihydroxyvitamin D(3) [1,25-(OH)(2)D(3)] on selected vitamin D-regulated events in the rat. Biochem Pharmacol 2000; 60:701-8. [PMID: 10927029 DOI: 10.1016/s0006-2952(00)00378-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The present experiments were conducted to compare the relative hypercalciuric and hypercalcemic activities of 1,24-dihydroxyvitamin D(2) [1,24-(OH)(2)D(2)], 1,24-dihydroxyvitamin D(3) [1, 24-(OH)(2)D(3)], and 1,25-dihydroxyvitamin D(3) [1,25-(OH)(2)D(3)] in 7-week-old rats. The rats were dosed orally with each sterol for 7 days at a rate of 1 ng/g body weight/day. We also monitored the effect of the three compounds on the induction of mRNA for CaATPase and for 25-hydroxyvitamin D-24-hydroxylase in the kidney and intestine, on plasma vitamin D metabolite levels, and on the capacity to evoke modification in the vitamin D receptor/retinoic acid X receptor (VDR/RXR) heterodimer conformation. Plasma calcium was elevated in the rats treated with 1,24-(OH)(2)D(3) and 1, 25-(OH)(2)D(3), but not in the 1,24-(OH)(2)D(2)-dosed rats. Urinary calcium was elevated significantly (relative to controls) in all groups. The order of hypercalciuric activity was 1,25-(OH)(2)D(3) >/= 1,24-(OH)(2)D(3) >/= 1,24-(OH)(2)D(2) > control. Duodenal plasma membrane calcium ATPase (PMCA) mRNA was elevated to a similar extent in all groups relative to controls. Duodenal 24-hydroxylase mRNA was elevated in all groups relative to controls; however, the elevations were significantly higher in the 1,24-(OH)(2)D(3) and 1, 25-(OH)(2)D(3) groups compared with the 1,24-(OH)(2)D(2) group. Kidney 24-hydroxylase also was elevated significantly in the 1, 24-(OH)(2)D(3)- and 1,25-(OH)(2)D(3)-treated rats but not in the 1, 24-(OH)(2)D(2)-treated rats. Recombinant human vitamin D receptor (hVDR) extracts were incubated with saturating concentrations of 1, 24-(OH)(2)D(2), 1,24-(OH)(2)D(3), and 1,25-(OH)(2)D(3) and subsequently analyzed by electrophoretic mobility shift assay (EMSA). Overall binding was comparable for all metabolites; however, the 1, 24-(OH)(2)D(2) complex exhibited distinctly altered mobility relative to 1,24-(OH)(2)D(3) and 1,25-(OH)(2)D(3), suggestive of an effect on hVDR/hRXR conformation. These data suggest that 1, 24-(OH)(2)D(2) is not as potent as either of the vitamin D(3) sterols at affecting hypercalcemia or hypercalciuria in young growing rats; however, 1,24-(OH)(2)D(2) can evoke other biological responses similar to the vitamin D(3) sterols. These different responses may be related to the alterations in conformation state of the hVDR/hRXR heterodimer.
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Affiliation(s)
- R Horst
- USDA-ARS, National Animal Disease Center, Ames, IA 50010, USA.
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50
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Abstract
Infusions of norepinephrine (NE), the gamma-aminobutyric acid agonist, muscimol (MUS), or neuropeptide Y (NPY) into the paraventricular nucleus (PVN) of the hypothalamus all increase food intake. Such feeding may be due to direct activation of behavioral processes driving ingestion and/or to alterations in nutrient metabolism that feeding serves to normalize. To examine these possibilities, male Sprague-Dawley rats received PVN infusions of vehicle, 20 nmol NE, 1 nmol MUS or 100 pmol NPY at dark onset, then food intake was measured under three feeding conditions: (1) 1 and 2 h immediately after injections, (2) 1 h after a 1 h delay between injections and access to food, and (3) 1 h after a 1 h feeding delay, but with injections occurring just before presenting food. Measures of energy expenditure (EE) and respiratory quotients (RQs) in the absence of food were made over 2 h in parallel experiments. Results confirmed that NE, MUS and NPY all increased dark-onset feeding, but only NPY increased intake above control levels after a 1 h feeding delay. No neurochemically-induced changes in EE were observed, nor were there changes in RQs after NE or MUS. However, NPY reliably enhanced RQs from 30 to 120 min of testing. Our findings imply that NE and MUS initiate relatively immediate, short-term feeding that is not associated with changes in nutrient metabolism and does not summate with cues stimulated by delayed access to food. NPY initiates more protracted feeding temporally linked to enhanced carbohydrate metabolism. This may indicate that part of NPY's feeding stimulatory effects are secondary to physiological processes driving ingestion.
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Affiliation(s)
- C Bishop
- Department of Psychology, Wayne State University, 71 W. Warren Ave., Detroit, MI 48202, USA.
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