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Li P, Pachis ST, Xu G, Schraauwen R, Incitti R, de Vries AC, Bruno MJ, Peppelenbosch MP, Alam I, Raymond K, Pan Q. Mpox virus infection and drug treatment modelled in human skin organoids. Nat Microbiol 2023; 8:2067-2079. [PMID: 37828248 DOI: 10.1038/s41564-023-01489-6] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 09/04/2023] [Indexed: 10/14/2023]
Abstract
Mpox virus (MPXV) primarily infects human skin to cause lesions. Currently, robust models that recapitulate skin infection by MPXV are lacking. Here we demonstrate that human induced pluripotent stem cell-derived skin organoids are susceptible to MPXV infection and support infectious virus production. Keratinocytes, the predominant cell type of the skin epithelium, effectively support MPXV infection. Using transmission electron microscopy, we visualized the four stages of intracellular virus particle assembly: crescent formation, immature virions, mature virions and wrapped virions. Transcriptional analysis showed that MPXV infection rewires the host transcriptome and triggers abundant expression of viral transcripts. Early treatment with the antiviral drug tecovirimat effectively inhibits infectious virus production and prevents host transcriptome rewiring. Delayed treatment with tecovirimat also inhibits infectious MPXV particle production, albeit to a lesser extent. This study establishes human skin organoids as a robust experimental model for studying MPXV infection, mapping virus-host interactions and testing therapeutics.
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Affiliation(s)
- Pengfei Li
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Spyridon T Pachis
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands
- The Novo Nordisk Foundation Center for Stem Cell Medicine (reNEW), Leiden University Medical Center, Leiden, the Netherlands
| | - Guige Xu
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Rick Schraauwen
- Department of Pathology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Roberto Incitti
- Computational Bioscience Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Annemarie C de Vries
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Marco J Bruno
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Maikel P Peppelenbosch
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands
| | - Intikhab Alam
- Computational Bioscience Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Karine Raymond
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands.
- The Novo Nordisk Foundation Center for Stem Cell Medicine (reNEW), Leiden University Medical Center, Leiden, the Netherlands.
- University of Grenoble Alpes, CEA, Inserm, IRIG, UA13 BGE, Biomics, Grenoble, France.
| | - Qiuwei Pan
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands.
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Bernardo TM, Rushton J, Huntington B, Stacey DA, Raymond K, Bensassi N, Patterson GT. Informatics progress of the Global Burden of Animal Diseases programme towards data for One Health. REV SCI TECH OIE 2023; 42:218-229. [PMID: 37232302 DOI: 10.20506/rst.42.3365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The Global Burden of Animal Diseases (GBADs) programme will provide data-driven evidence that policy-makers can use to evaluate options, inform decisions, and measure the success of animal health and welfare interventions. The GBADs' Informatics team is developing a transparent process for identifying, analysing, visualising and sharing data to calculate livestock disease burdens and drive models and dashboards. These data can be combined with data on other global burdens (human health, crop loss, foodborne diseases) to provide a comprehensive range of information on One Health, required to address such issues as antimicrobial resistance and climate change. The programme began by gathering open data from international organisations (which are undergoing their own digital transformations). Efforts to achieve an accurate estimate of livestock numbers revealed problems in finding, accessing and reconciling data from different sources over time. Ontologies and graph databases are being developed to bridge data silos and improve the findability and interoperability of data. Dashboards, data stories, a documentation website and a Data Governance Handbook explain GBADs data, now available through an application programming interface. Sharing data quality assessments builds trust in such data, encouraging their application to livestock and One Health issues. Animal welfare data present a particular challenge, as much of this information is held privately and discussions continue regarding which data are the most relevant. Accurate livestock numbers are an essential input for calculating biomass, which subsequently feeds into calculations of antimicrobial use and climate change. The GBADs data are also essential to at least eight of the United Nations Sustainable Development Goals.
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Ramovs V, Janssen H, Fuentes I, Pitaval A, Rachidi W, Chuva de Sousa Lopes SM, Freund C, Gidrol X, Mummery CL, Raymond K. Characterization of the epidermal-dermal junction in hiPSC-derived skin organoids. Stem Cell Reports 2022; 17:1279-1288. [PMID: 35561682 PMCID: PMC9213820 DOI: 10.1016/j.stemcr.2022.04.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [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: 06/23/2021] [Revised: 04/11/2022] [Accepted: 04/13/2022] [Indexed: 12/31/2022] Open
Abstract
Human induced pluripotent stem cell (hiPSC)-derived hair-bearing skin organoids offer exciting new possibilities for modeling diseases like epidermolysis bullosa (EB). These inherited diseases affect 1 in 30,000 people worldwide and result from perturbed expression and/or structure of components of the epidermal-dermal junction (EDJ). To establish whether hiPSC-derived skin organoids might be able to capture salient features of EB, it is thus important to characterize their EDJ. Here, we report successful generation of hair-bearing skin organoids from two hiPSC lines that exhibited fully stratified interfollicular epidermis. Using immunofluorescence and electron microscopy, we showed that basal keratinocytes in organoids adhere to laminin-332 and type IV collagen-rich basement membrane via type I hemidesmosomes and integrin β1-based adhesion complexes. Importantly, we demonstrated that EDJs in organoids are almost devoid of type VII collagen, a fibril that mediates anchorage of the epidermis to dermis. This should be considered when using skin organoids for EB modeling. Hair-bearing skin organoids form a stratified interfollicular epidermis in vitro Organoid keratinocytes form type I hemidesmosomes and integrin β1-based complexes Basement membrane in skin organoids is rich in laminin-332 and type IV collagen Low levels of type VII collagen in organoids may be limiting for disease modeling
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Affiliation(s)
- Veronika Ramovs
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands
| | - Hans Janssen
- Electron Microscopy Facility, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - Ignacia Fuentes
- Fundación DEBRA Chile, Santiago, Chile; Centro de Genética y Genómica, Facultad de Medicina, Clínica Alemana Universidad del Desarrollo, Santiago, Chile
| | - Amandine Pitaval
- University of Grenoble Alpes, CEA, INSERM, IRIG-BIOMICS, Grenoble, France
| | - Walid Rachidi
- University of Grenoble Alpes, CEA, INSERM, IRIG-BIOMICS, Grenoble, France
| | - Susana M Chuva de Sousa Lopes
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands; Ghent Fertility and Stem Cell Team (G-FaST), Department for Reproductive Medicine, Ghent University Hospital, Ghent, Belgium
| | - Christian Freund
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands; LUMC hiPSC Hotel, Leiden University Medical Center, Leiden, the Netherlands
| | - Xavier Gidrol
- University of Grenoble Alpes, CEA, INSERM, IRIG-BIOMICS, Grenoble, France
| | - Christine L Mummery
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands; LUMC hiPSC Hotel, Leiden University Medical Center, Leiden, the Netherlands
| | - Karine Raymond
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, the Netherlands; LUMC hiPSC Hotel, Leiden University Medical Center, Leiden, the Netherlands; University of Grenoble Alpes, CEA, INSERM, IRIG-BIOMICS, Grenoble, France.
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Ramovs V, Fuentes I, Freund C, Mikkers H, Mummery CL, Raymond K. Generation and genetic repair of two human induced pluripotent cell lines from patients with Epidermolysis Bullosa simplex and dilated cardiomyopathy associated with a heterozygous mutation in the translation initiation codon of KLHL24. Stem Cell Res 2021; 57:102582. [PMID: 34688992 DOI: 10.1016/j.scr.2021.102582] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 10/15/2021] [Accepted: 10/18/2021] [Indexed: 11/26/2022] Open
Abstract
Fibroblasts from two patients carrying a heterozygous mutation in the translation initiation codon (c.2 T > G) of the kelch-like protein 24 (KLHL24) gene were used to generate human induced pluripotent stem cells (hiPSCs), using non-integrating Sendai virus to deliver reprogramming factors. CRISPR-Cas9 editing was used for genetic correction of the mutation in the patient-hiPSCs. The top-predicted off-target sites were not altered. Patient and isogenic hiPSCs showed typical morphology, expressed pluripotency-associated markers, had the capacity for in vitro differentiation into the three germ layers and displayed a normal karyotype. These isogenic pairs will enable in vitro modelling of KLHL24-associated heart and skin conditions.
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Affiliation(s)
- Veronika Ramovs
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden 2333 ZC, The Netherlands
| | - Ignacia Fuentes
- Fundación DEBRA Chile, Santiago, Chile; Centro de Genética y Genómica, Facultad de Medicina, Clínica Alemana Universidad del Desarrollo, Santiago, Chile
| | - Christian Freund
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden 2333 ZC, The Netherlands; LUMC hiPSC Hotel, Leiden University Medical Center, Leiden, The Netherlands
| | - Harald Mikkers
- LUMC hiPSC Hotel, Leiden University Medical Center, Leiden, The Netherlands; Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, The Netherlands
| | - Christine L Mummery
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden 2333 ZC, The Netherlands; LUMC hiPSC Hotel, Leiden University Medical Center, Leiden, The Netherlands
| | - Karine Raymond
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden 2333 ZC, The Netherlands; LUMC hiPSC Hotel, Leiden University Medical Center, Leiden, The Netherlands.
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Garcia FH, Andreoiu C, Ball GC, Bell A, Garnsworthy AB, Nowacki F, Petrache CM, Poves A, Whitmore K, Ali FA, Bernier N, Bhattacharjee SS, Bowry M, Coleman RJ, Dillmann I, Djianto I, Forney AM, Gascoine M, Hackman G, Leach KG, Murphy AN, Natzke CR, Olaizola B, Ortner K, Peters EE, Rajabali MM, Raymond K, Svensson CE, Umashankar R, Williams J, Yates D. Absence of Low-Energy Shape Coexistence in ^{80}Ge: The Nonobservation of a Proposed Excited 0_{2}^{+} Level at 639 keV. Phys Rev Lett 2020; 125:172501. [PMID: 33156683 DOI: 10.1103/physrevlett.125.172501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 08/19/2020] [Accepted: 09/18/2020] [Indexed: 06/11/2023]
Abstract
The ^{80}Ge structure was investigated in a high-statistics β-decay experiment of ^{80}Ga using the GRIFFIN spectrometer at TRIUMF-ISAC through γ, β-e, e-γ, and γ-γ spectroscopy. No evidence was found for the recently reported 0_{2}^{+} 639-keV level suggested as evidence for low-energy shape coexistence in ^{80}Ge. Large-scale shell model calculations performed in ^{78,80,82}Ge place the 0_{2}^{+} level in ^{80}Ge at 2 MeV. The new experimental evidence combined with shell model predictions indicate that low-energy shape coexistence is not present in ^{80}Ge.
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Affiliation(s)
- F H Garcia
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - C Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - G C Ball
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A Bell
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - A B Garnsworthy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - F Nowacki
- Université de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg, France
- CNRS, UMR7178, 67037 Strasbourg, France
| | - C M Petrache
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | - A Poves
- Departamento de Física Teórica and IFTUAM/CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - K Whitmore
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - F A Ali
- Department of Physics, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
- Department of Physics, College of Education, University of Sulaimani, P.O. Box 334, Sulaimani, Kurdistan Region, Iraq
| | - N Bernier
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - S S Bhattacharjee
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M Bowry
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - R J Coleman
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - I Dillmann
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - I Djianto
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - A M Forney
- Department of Chemistry and Biochemistry, University of Maryland College Park, College Park, Maryland 20742, USA
| | - M Gascoine
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - G Hackman
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - K G Leach
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - A N Murphy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - C R Natzke
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
| | - B Olaizola
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
| | - K Ortner
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - E E Peters
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA
| | - M M Rajabali
- Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - K Raymond
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - C E Svensson
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - R Umashankar
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
| | - J Williams
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - D Yates
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
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Sperber H, Togarrati P, Raymond K, Bouzidi M, Gilfanova R, Muench M, Pillai S. μ-Lat: a high-throughput humanised mouse model of latent HIV infection. J Virus Erad 2019. [DOI: 10.1016/s2055-6640(20)30119-9] [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: 11/16/2022] Open
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Bouma MJ, Freund C, IJzerman AP, Boomsma DI, Mummery CL, Raymond K. Lymphoblast-derived hiPS cell lines generated from four individuals of a family of genetically unrelated parents and their female monozygotic twins. Stem Cell Res 2019; 41:101654. [PMID: 31734644 DOI: 10.1016/j.scr.2019.101654] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 11/06/2019] [Indexed: 11/29/2022] Open
Abstract
Lymphoblast cells from four individuals of a family of two genetically unrelated parents and their monozygotic twins were used to generate integration-free human induced pluripotent stem cells (hiPSCs). Reprogramming factors were delivered by co-electroporation of three episomal-based plasmids expressing OCT3/4, SOX2, KLF4, L-MYC and LIN28. The hiPSCs showed a normal karyotype, expressed pluripotency-associated markers, displayed the capacity for in vitro differentiation into the three germ layers and were Epstein Barr virus-free. These hiPSC lines offer the possibility to compare genetically unrelated and genetically identical tissues from different individuals and to study genotype-specific effects, which are particularly relevant for toxicology testing.
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Affiliation(s)
- Marga J Bouma
- LUMC human iPSC Hotel, Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, 2333 ZC, the Netherlands
| | - Christian Freund
- LUMC human iPSC Hotel, Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, 2333 ZC, the Netherlands
| | - Adriaan P IJzerman
- Division of Drug Discovery and Safety, Leiden Academic Centre for Drug Research, Leiden University, PO Box 9502, 2300 RA, Leiden, the Netherlands
| | - Dorret I Boomsma
- Department of Biological Psychology, VU University Amsterdam, Neuroscience Amsterdam, Amsterdam, the Netherlands
| | - Christine L Mummery
- LUMC human iPSC Hotel, Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, 2333 ZC, the Netherlands
| | - Karine Raymond
- LUMC human iPSC Hotel, Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, 2333 ZC, the Netherlands.
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Thalgott JH, Dos-Santos-Luis D, Hosman AE, Martin S, Lamandé N, Bracquart D, Srun S, Galaris G, de Boer HC, Tual-Chalot S, Kroon S, Arthur HM, Cao Y, Snijder RJ, Disch F, Mager JJ, Rabelink TJ, Mummery CL, Raymond K, Lebrin F. Decreased Expression of Vascular Endothelial Growth Factor Receptor 1 Contributes to the Pathogenesis of Hereditary Hemorrhagic Telangiectasia Type 2. Circulation 2019; 138:2698-2712. [PMID: 30571259 DOI: 10.1161/circulationaha.117.033062] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Hereditary Hemorrhagic Telangiectasia type 2 (HHT2) is an inherited genetic disorder characterized by vascular malformations and hemorrhage. HHT2 results from ACVRL1 haploinsufficiency, the remaining wild-type allele being unable to contribute sufficient protein to sustain endothelial cell function. Blood vessels function normally but are prone to respond to angiogenic stimuli, leading to the development of telangiectasic lesions that can bleed. How ACVRL1 haploinsufficiency leads to pathological angiogenesis is unknown. METHODS We took advantage of Acvrl1+/- mutant mice that exhibit HHT2 vascular lesions and focused on the neonatal retina and the airway system after Mycoplasma pulmonis infection, as physiological and pathological models of angiogenesis, respectively. We elucidated underlying disease mechanisms in vitro by generating Acvrl1+/- mouse embryonic stem cell lines that underwent sprouting angiogenesis and performed genetic complementation experiments. Finally, HHT2 plasma samples and skin biopsies were analyzed to determine whether the mechanisms evident in mice are conserved in humans. RESULTS Acvrl1+/- retinas at postnatal day 7 showed excessive angiogenesis and numerous endothelial "tip cells" at the vascular front that displayed migratory defects. Vascular endothelial growth factor receptor 1 (VEGFR1; Flt-1) levels were reduced in Acvrl1+/- mice and HHT2 patients, suggesting similar mechanisms in humans. In sprouting angiogenesis, VEGFR1 is expressed in stalk cells to inhibit VEGFR2 (Flk-1, KDR) signaling and thus limit tip cell formation. Soluble VEGFR1 (sVEGFR1) is also secreted, creating a VEGF gradient that promotes orientated sprout migration. Acvrl1+/- embryonic stem cell lines recapitulated the vascular anomalies in Acvrl1+/- (HHT2) mice. Genetic insertion of either the membrane or soluble form of VEGFR1 into the ROSA26 locus of Acvrl1+/- embryonic stem cell lines prevented the vascular anomalies, suggesting that high VEGFR2 activity in Acvrl1+/- endothelial cells induces HHT2 vascular anomalies. To confirm our hypothesis, Acvrl1+/- mice were infected by Mycoplasma pulmonis to induce sustained airway inflammation. Infected Acvrl1+/- tracheas showed excessive angiogenesis with the formation of multiple telangiectases, vascular defects that were prevented by VEGFR2 blocking antibodies. CONCLUSIONS Our findings demonstrate a key role of VEGFR1 in HHT2 pathogenesis and provide mechanisms explaining why HHT2 blood vessels respond abnormally to angiogenic signals. This supports the case for using anti-VEGF therapy in HHT2.
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Affiliation(s)
- Jérémy H Thalgott
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, The Netherlands (J.H.T., G.G., H.C.d.B., T.J.R., K.R., F.L.)
| | - Damien Dos-Santos-Luis
- CNRS UMR 7241, INSERM U1050, Collège de France, Paris (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
- MEMOLIFE Laboratory of Excellence and PSL Research University, Paris, France (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
| | - Anna E Hosman
- St. Antonius Hospital, Nieuwegein, The Netherlands (A.E.H., S.K., R.J.S., F.D., J.J.M.)
| | - Sabrina Martin
- CNRS UMR 7241, INSERM U1050, Collège de France, Paris (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
- MEMOLIFE Laboratory of Excellence and PSL Research University, Paris, France (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
| | - Noël Lamandé
- CNRS UMR 7241, INSERM U1050, Collège de France, Paris (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
- MEMOLIFE Laboratory of Excellence and PSL Research University, Paris, France (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
| | - Diane Bracquart
- CNRS UMR 7241, INSERM U1050, Collège de France, Paris (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
- MEMOLIFE Laboratory of Excellence and PSL Research University, Paris, France (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
| | - Samly Srun
- CNRS UMR 7241, INSERM U1050, Collège de France, Paris (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
- MEMOLIFE Laboratory of Excellence and PSL Research University, Paris, France (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
| | - Georgios Galaris
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, The Netherlands (J.H.T., G.G., H.C.d.B., T.J.R., K.R., F.L.)
| | - Hetty C de Boer
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, The Netherlands (J.H.T., G.G., H.C.d.B., T.J.R., K.R., F.L.)
| | - Simon Tual-Chalot
- Institute of Genetic Medicine, Centre of Life, Newcastle University, United Kingdom (S.T.-C., H.M.A., )
| | - Steven Kroon
- St. Antonius Hospital, Nieuwegein, The Netherlands (A.E.H., S.K., R.J.S., F.D., J.J.M.)
| | - Helen M Arthur
- Institute of Genetic Medicine, Centre of Life, Newcastle University, United Kingdom (S.T.-C., H.M.A., )
| | - Yihai Cao
- Department of Microbiology, Tumor and cell Biology, Karolinska Institute, Stockholm, Sweden (Y.C.)
| | - Repke J Snijder
- St. Antonius Hospital, Nieuwegein, The Netherlands (A.E.H., S.K., R.J.S., F.D., J.J.M.)
| | - Frans Disch
- St. Antonius Hospital, Nieuwegein, The Netherlands (A.E.H., S.K., R.J.S., F.D., J.J.M.)
| | - Johannes J Mager
- St. Antonius Hospital, Nieuwegein, The Netherlands (A.E.H., S.K., R.J.S., F.D., J.J.M.)
| | - Ton J Rabelink
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, The Netherlands (J.H.T., G.G., H.C.d.B., T.J.R., K.R., F.L.)
| | - Christine L Mummery
- Department of Anatomy and Embryology, Leiden University Medical Center, The Netherlands (C.L.M.)
| | - Karine Raymond
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, The Netherlands (J.H.T., G.G., H.C.d.B., T.J.R., K.R., F.L.)
- Sorbonne Université, UPMC Université Paris 06, INSERM UMR_S938, Centre de Recherche Saint-Antoine, France (K.R.)
| | - Franck Lebrin
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, The Netherlands (J.H.T., G.G., H.C.d.B., T.J.R., K.R., F.L.)
- CNRS UMR 7241, INSERM U1050, Collège de France, Paris (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
- MEMOLIFE Laboratory of Excellence and PSL Research University, Paris, France (D.D.-S.-L., S.M., N.L., D.B., S.S., F.L.)
- CNRS UMR 7587, INSERM U979, Institut Langevin, ESPCI, Paris, France (F.L.)
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Balakrishnan B, Verheijen J, Lupo A, Raymond K, Turgeon CT, Yang Y, Carter KL, Whitehead KJ, Kozicz T, Morava E, Lai K. A novel phosphoglucomutase-deficient mouse model reveals aberrant glycosylation and early embryonic lethality. J Inherit Metab Dis 2019; 42:998-1007. [PMID: 31077402 PMCID: PMC6739163 DOI: 10.1002/jimd.12110] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 05/06/2019] [Accepted: 05/08/2019] [Indexed: 01/01/2023]
Abstract
Patients with phosphoglucomutase (PGM1) deficiency, a congenital disorder of glycosylation (CDG) suffer from multiple disease phenotypes. Midline cleft defects are present at birth. Overtime, additional clinical phenotypes, which include severe hypoglycemia, hepatopathy, growth retardation, hormonal deficiencies, hemostatic anomalies, frequently lethal, early-onset of dilated cardiomyopathy and myopathy emerge, reflecting the central roles of the enzyme in (glycogen) metabolism and glycosylation. To delineate the pathophysiology of the tissue-specific disease phenotypes, we constructed a constitutive Pgm2 (mouse ortholog of human PGM1)-knockout (KO) mouse model using CRISPR-Cas9 technology. After multiple crosses between heterozygous parents, we were unable to identify homozygous life births in 78 newborn pups (P = 1.59897E-06), suggesting an embryonic lethality phenotype in the homozygotes. Ultrasound studies of the course of pregnancy confirmed Pgm2-deficient pups succumb before E9.5. Oral galactose supplementation (9 mg/mL drinking water) did not rescue the lethality. Biochemical studies of tissues and skin fibroblasts harvested from heterozygous animals confirmed reduced Pgm2 enzyme activity and abundance, but no change in glycogen content. However, glycomics analyses in serum revealed an abnormal glycosylation pattern in the Pgm2+/- animals, similar to that seen in PGM1-CDG.
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Affiliation(s)
- B Balakrishnan
- Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, Utah
| | - J Verheijen
- Center for Individualized Medicine, Department of Clinical Genomics, and Biochemical Genetics Laboratory, Mayo Clinic, Rochester, Minnesota
| | - A Lupo
- Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, Utah
| | - K Raymond
- Center for Individualized Medicine, Department of Clinical Genomics, and Biochemical Genetics Laboratory, Mayo Clinic, Rochester, Minnesota
| | - CT Turgeon
- Center for Individualized Medicine, Department of Clinical Genomics, and Biochemical Genetics Laboratory, Mayo Clinic, Rochester, Minnesota
| | - Y Yang
- Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, Utah
| | - KL Carter
- Small Animal Ultrasound Core Facility, University of Utah School of Medicine, Salt Lake City, Utah
| | - KJ Whitehead
- Small Animal Ultrasound Core Facility, University of Utah School of Medicine, Salt Lake City, Utah
| | - T Kozicz
- Center for Individualized Medicine, Department of Clinical Genomics, and Biochemical Genetics Laboratory, Mayo Clinic, Rochester, Minnesota
| | - E Morava
- Center for Individualized Medicine, Department of Clinical Genomics, and Biochemical Genetics Laboratory, Mayo Clinic, Rochester, Minnesota
| | - K Lai
- Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, Utah
- Corresponding Author: Kent Lai, Division of Medical Genetics, Department of Pediatrics, University of Utah School of Medicine, 295 Chipeta Way, Salt Lake City, Utah, U.S.A. 84108,
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10
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Romagnoli M, Cagnet S, Chiche A, Bresson L, Baulande S, de la Grange P, De Arcangelis A, Kreft M, Georges-Labouesse E, Sonnenberg A, Deugnier MA, Raymond K, Glukhova MA, Faraldo MM. Deciphering the Mammary Stem Cell Niche: A Role for Laminin-Binding Integrins. Stem Cell Reports 2019; 12:831-844. [PMID: 30905738 PMCID: PMC6450809 DOI: 10.1016/j.stemcr.2019.02.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 07/31/2018] [Revised: 02/18/2019] [Accepted: 02/19/2019] [Indexed: 12/15/2022] Open
Abstract
Integrins, which bind laminin, a major component of the mammary basement membrane, are strongly expressed in basal stem cell-enriched populations, but their role in controlling mammary stem cell function remains unclear. We found that stem cell activity, as evaluated in transplantation and mammosphere assays, was reduced in mammary basal cells depleted of laminin receptors containing α3- and α6-integrin subunits. This was accompanied by low MDM2 levels, p53 stabilization, and diminished proliferative capacity. Importantly, disruption of p53 function restored the clonogenicity of α3/α6-integrin-depleted mammary basal stem cells, while inhibition of RHO or myosin II, leading to decreased p53 activity, rescued the mammosphere formation. These data suggest that α3/α6-integrin-mediated adhesion plays an essential role in controlling the proliferative potential of mammary basal stem/progenitor cells through myosin II-mediated regulation of p53 and indicate that laminins might be important components of the mammary stem cell niche. α3- and α6-integrins are required for mammary basal stem cell function p53 is activated in mammary basal cells depleted of α3- and α6-integrins RHO and myosin II mediate p53 activation in α3- and α6-integrin-depleted cells
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Affiliation(s)
- Mathilde Romagnoli
- Institut Curie, PSL Research University, CNRS, UMR144, 26 Rue d'Ulm, 75005 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, 75005 Paris, France
| | - Stéphanie Cagnet
- Institut Curie, PSL Research University, CNRS, UMR144, 26 Rue d'Ulm, 75005 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, 75005 Paris, France
| | - Aurélie Chiche
- Institut Curie, PSL Research University, CNRS, UMR144, 26 Rue d'Ulm, 75005 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, 75005 Paris, France
| | - Laura Bresson
- Institut Curie, PSL Research University, CNRS, UMR144, 26 Rue d'Ulm, 75005 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, 75005 Paris, France
| | - Sylvain Baulande
- Institut Curie Genomics of Excellence (ICGex) Platform, Institut Curie, 75005 Paris, France
| | | | - Adèle De Arcangelis
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS UMR 7104/INSERM U1258/Université de Strasbourg, 67404 Illkirch, France
| | - Maaike Kreft
- Division of Cell Biology, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands
| | - Elisabeth Georges-Labouesse
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS UMR 7104/INSERM U1258/Université de Strasbourg, 67404 Illkirch, France
| | - Arnoud Sonnenberg
- Division of Cell Biology, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands
| | - Marie-Ange Deugnier
- Institut Curie, PSL Research University, CNRS, UMR144, 26 Rue d'Ulm, 75005 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, 75005 Paris, France; Inserm, Paris, 75013 Paris, France
| | - Karine Raymond
- Institut Curie, PSL Research University, CNRS, UMR144, 26 Rue d'Ulm, 75005 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, 75005 Paris, France; Inserm, Paris, 75013 Paris, France
| | - Marina A Glukhova
- Institut Curie, PSL Research University, CNRS, UMR144, 26 Rue d'Ulm, 75005 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, 75005 Paris, France; Inserm, Paris, 75013 Paris, France
| | - Marisa M Faraldo
- Institut Curie, PSL Research University, CNRS, UMR144, 26 Rue d'Ulm, 75005 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, 75005 Paris, France; Inserm, Paris, 75013 Paris, France.
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11
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Lempereur A, Canto PY, Richard C, Martin S, Thalgott J, Raymond K, Lebrin F, Drevon C, Jaffredo T. The TGFβ pathway is a key player for the endothelial-to-hematopoietic transition in the embryonic aorta. Dev Biol 2017; 434:292-303. [PMID: 29253505 DOI: 10.1016/j.ydbio.2017.12.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 10/11/2017] [Revised: 12/07/2017] [Accepted: 12/08/2017] [Indexed: 12/30/2022]
Abstract
The embryonic aorta produces hematopoietic stem and progenitor cells from a hemogenic endothelium localized in the aortic floor through an endothelial to hematopoietic transition. It has been long proposed that the Bone Morphogenetic Protein (BMP)/Transforming Growth Factor ß (TGFß) signaling pathway was implicated in aortic hematopoiesis but the very nature of the signal was unknown. Here, using thorough expression analysis of the BMP/TGFß signaling pathway members in the endothelial and hematopoietic compartments of the aorta at pre-hematopoietic and hematopoietic stages, we show that the TGFß pathway is preferentially balanced with a prominent role of Alk1/TgfßR2/Smad1 and 5 on both chicken and mouse species. Functional analysis using embryonic stem cells mutated for Acvrl1 revealed an enhanced propensity to produce hematopoietic cells. Collectively, we reveal that TGFß through the Alk1/TgfßR2 receptor axis is acting on endothelial cells to produce hematopoiesis.
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Affiliation(s)
- A Lempereur
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France
| | - P Y Canto
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France
| | - C Richard
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France
| | - S Martin
- CNRS UMR 7241/INSERM U1050, Center for Interdisciplinary Research in Biology, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris CEDEX 05, France; MEMOLIFE Laboratory of Excellence and Paris Sciences et Lettres Research University, France
| | - J Thalgott
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, Leiden, The Netherlands
| | - K Raymond
- Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, Leiden, The Netherlands
| | - F Lebrin
- CNRS UMR 7241/INSERM U1050, Center for Interdisciplinary Research in Biology, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris CEDEX 05, France; Einthoven Laboratory for Experimental Vascular Medicine, Department of Internal Medicine (Nephrology), Leiden University Medical Center, Leiden, The Netherlands; MEMOLIFE Laboratory of Excellence and Paris Sciences et Lettres Research University, France
| | - C Drevon
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France
| | - T Jaffredo
- Sorbonne Universités, UPMC Univ Paris 06, IBPS, CNRS UMR7622, Inserm U 1156, Laboratoire de Biologie du Développement, 75005 Paris, France.
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12
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Cagnet S, Glukhova MA, Raymond K. Contractility Assay for Established Myoepithelial Cell Lines. Methods Mol Biol 2017; 1501:189-198. [PMID: 27796953 DOI: 10.1007/978-1-4939-6475-8_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The capacity of mammary myoepithelial cells to contract in response to suckling stimuli is essential for lactation. We describe here a protocol for studying the contractile activity of myoepithelial cells in vitro. This protocol includes the establishment of stable myoepithelial cell lines from mouse mammary glands and quantitative evaluation of the contraction and subsequent relaxation of cultured myoepithelial cells in response to oxytocin. It can be used for analyses of mouse mutants with gene deletions or overexpression altering myoepithelial cell function.
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Affiliation(s)
- Stéphanie Cagnet
- Institut Curie, Centre de Recherche, Paris, 75248, France
- CNRS, UMR144, Paris, 75248, France
- ISREC - Swiss Institute for Experimental Cancer Research, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), SV2.832 Station 19, CH-1015, Lausanne, Switzerland
| | - Marina A Glukhova
- Institut Curie, Centre de Recherche, Paris, 75248, France.
- CNRS, UMR144, Paris, 75248, France.
| | - Karine Raymond
- Institut Curie, Centre de Recherche, Paris, 75248, France.
- CNRS, UMR144, Paris, 75248, France.
- Saint Antoine Research Center, UPMC Université Paris 06, INSERM U938, Paris, France.
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13
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Nguyen VT, Nassar D, Batteux F, Raymond K, Tharaux PL, Aractingi S. Delayed Healing of Sickle Cell Ulcers Is due to Impaired Angiogenesis and CXCL12 Secretion in Skin Wounds. J Invest Dermatol 2015; 136:497-506. [PMID: 26967481 DOI: 10.1016/j.jid.2015.11.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 08/14/2015] [Accepted: 10/12/2015] [Indexed: 01/31/2023]
Abstract
Leg ulcers are a major complication of sickle cell disease that occur in 2.5-40% of patients. Leg ulcers are responsible for frequent complications because they are often long-lasting and are highly resistant to therapy. Although their occurrence is associated with hyperhemolysis, the mechanisms underlying sickle cell ulcers remain poorly understood. In this study, we show that skin wound healing is severely altered in old SAD sickle cell mice but is normal in young animals, consistent with reports in humans. Alterations of wound healing were associated with impaired blood and lymphatic angiogenesis in the wound beds and poor endothelial progenitor cell mobilization from the bone marrow. CXCL12 secretion by keratinocytes and inflammatory cells was low in the wounds of SAD mice. Local therapy with endothelial progenitor cells or recombinant CXCL12 injections restored wound angiogenesis and rescued the healing defect together with mobilization of circulating endothelial progenitor cells. To our knowledge, this is a previously unreported study of the cellular and molecular mechanisms of sickle cell ulcers in a murine model that provides promising therapeutic perspectives for clinical trials.
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Affiliation(s)
- Van Tuan Nguyen
- Progenitors and Endothelial Cells During and After Pregnancy Laboratory, INSERM UMR_S 938, Centre de Recherche, St. Antoine, Paris, France; UPMC-Université Paris 6, Paris, France
| | - Dany Nassar
- Progenitors and Endothelial Cells During and After Pregnancy Laboratory, INSERM UMR_S 938, Centre de Recherche, St. Antoine, Paris, France; UPMC-Université Paris 6, Paris, France; Department of Dermatology, American University of Beirut Medical Centre, Beirut, Lebanon; Department of Anatomy, Cell Biology and Physiology, Faculty of Medicine, American University of Beirut, Beirut, Lebanon
| | - Fréderic Batteux
- Faculty of Medicine, Université Paris Descartes-Paris 5, Paris, France
| | - Karine Raymond
- Progenitors and Endothelial Cells During and After Pregnancy Laboratory, INSERM UMR_S 938, Centre de Recherche, St. Antoine, Paris, France
| | | | - Sélim Aractingi
- Progenitors and Endothelial Cells During and After Pregnancy Laboratory, INSERM UMR_S 938, Centre de Recherche, St. Antoine, Paris, France; Faculty of Medicine, Université Paris Descartes-Paris 5, Paris, France; Department of Dermatology, Hôpital Cochin-Tarnier, Paris, France.
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14
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Tortorelli S, Turgeon C, Gavrilov D, Oglesbee D, Raymond K, Rinaldo P, Matern D. Combined screening for lysosomal and peroxisomal disorders by Flow Injection Liquid Chromatography Mass Spectrometry (FIA-MS/MS) in Dried Blood Spots (DBS). J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.728] [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: 10/22/2022]
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15
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Cagnet S, Faraldo MM, Kreft M, Sonnenberg A, Raymond K, Glukhova MA. Signaling events mediated by α3β1 integrin are essential for mammary tumorigenesis. Oncogene 2013; 33:4286-95. [PMID: 24077284 DOI: 10.1038/onc.2013.391] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 07/26/2013] [Indexed: 12/23/2022]
Abstract
The constitutive activation of β-catenin signaling in the mammary basal epithelial cell layer in transgenic K5ΔNβcat mice leads to basal-type tumor development. Integrins of the β1 family and integrin-mediated signaling events have an important role in breast tumor growth and progression. We show here that the deletion of α3β1 integrin, a major laminin receptor, from the basal layer of the mammary epithelium of K5ΔNβcat mice completely prevented the tumorigenesis induced by β-catenin signaling. Moreover, the depletion of α3β1 integrin from a spontaneously transformed mouse mammary basal epithelial cell line (MEC) prevented the cells from forming colonies in soft agar and greatly reduced tumor development in orthotopic grafts. Inhibition of the integrin signaling intermediates Rac1 or PAK1 (P21-activated Kinase 1) in MEC affected tumor cell growth in soft agar, whereas the expression of activated forms of these effectors in α3-depleted cells rescued the capacity of these cells to grow in non-adherent conditions. Similarly, the tumorigenic potential of α3-depleted cells was restored by the expression of activated PAK1, as assessed by orthotopic transplantation assay. In three-dimensional Matrigel culture, MEC survival and proliferation were affected by the depletion of α3β1 integrin, which also significantly decreased the activation of focal adhesion kinase (FAK), mitogen-activated protein kinase (MAPK) and c-Jun NH2-terminal kinase (JNK). Our data suggest that the activation of signaling cascades downstream from α3β1 and involving the Rac1/PAK1 pathway, MAPK and JNK, promotes prosurvival and proproliferative signals required for the malignant growth of basal mammary epithelial cells, providing further insight into the molecular mechanisms underlying breast cancer initiation and progression.
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Affiliation(s)
- S Cagnet
- 1] Institut Curie, Centre de Recherche, Paris, France [2] Section de Recherche, UMR144 Centre National de la Recherche Scientifique-Institut Curie, Paris, France
| | - M M Faraldo
- 1] Institut Curie, Centre de Recherche, Paris, France [2] Section de Recherche, UMR144 Centre National de la Recherche Scientifique-Institut Curie, Paris, France
| | - M Kreft
- Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - A Sonnenberg
- Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - K Raymond
- 1] Institut Curie, Centre de Recherche, Paris, France [2] Section de Recherche, UMR144 Centre National de la Recherche Scientifique-Institut Curie, Paris, France
| | - M A Glukhova
- 1] Institut Curie, Centre de Recherche, Paris, France [2] Section de Recherche, UMR144 Centre National de la Recherche Scientifique-Institut Curie, Paris, France
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16
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Raymond K, Martin S, Aractingi S, Lebrin F. The (pro)renin receptor controls Wnt signalling: promise from Drosophila and Xenopus. Eur J Dermatol 2013:ejd.2013.1975. [PMID: 23608678 DOI: 10.1684/ejd.2013.1975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The (pro)renin receptor (PRR) is a component of the renin-angiotensin system (RAS) that is believed to control blood pressure and salt homeostasis in mammals by favouring tissue activation of RAS. Genetic studies have recently provided novel and exciting insights into how PRR regulates embryonic development in Drosophila and Xenopus through RAS independent functions. By interacting with the H+ vacuolar ATPase (V-ATPase), PRR modulates Wnt signalling pathways. Signalling by Wnt family members governs many aspects of embryonic development and tissue homeostasis. In particular, in mammals, Wnt signalling plays essential roles in the control of stem cell fate decision and lineage commitment in tissues with high self-renewal capacities such as the intestine and the skin, in which we have found PRR to be strongly expressed. Here, we review recent data on how PRR is thought to function during development and place it in the broader context of wnt signalling in skin in general.
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Affiliation(s)
- Karine Raymond
- Saint Antoine Research Center, UPMC Univ Paris 06, INSERM U938, Paris, France
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17
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Nance J, Tesi-Rocha C, Kirmse B, Raymond K. 157. A novel mutation in LPIN1 gene causing recurrent rhabdomyolysis in childhood: An under-diagnosed condition? Clin Neurophysiol 2012. [DOI: 10.1016/j.clinph.2011.11.238] [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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18
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Raymond K, Faraldo MM, Deugnier MA, Glukhova MA. Integrins in mammary development. Semin Cell Dev Biol 2012; 23:599-605. [PMID: 22430758 DOI: 10.1016/j.semcdb.2012.03.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 02/29/2012] [Accepted: 03/02/2012] [Indexed: 01/11/2023]
Abstract
Integrins are ubiquitously expressed major cell surface receptors for extracellular matrix. Integrin interaction with their extracellular ligands triggers activation of the intracellular signaling pathways that control cell shape, motility, proliferation, survival, cell-type-specific gene expression. In this review, we summarize recent studies analyzing contribution of integrins to the control of the mammary morphogenesis and differentiation, function and maintenance of mammary stem and progenitor cells and resume the data from mouse models revealing the contribution of the integrin-mediated signaling to mammary tumorigenesis.
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Affiliation(s)
- Karine Raymond
- Institut Curie, Centre de Recherche, Paris, F-75248, France
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19
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Moumen M, Chiche A, Cagnet S, Petit V, Raymond K, Faraldo MM, Deugnier MA, Glukhova MA. The mammary myoepithelial cell. Int J Dev Biol 2012; 55:763-71. [PMID: 21948739 DOI: 10.1387/ijdb.113385mm] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Over the last few years, the discovery of basal-type mammary carcinomas and the association of the regenerative potential of the mammary epithelium with the basal myoepithelial cell population have attracted considerable attention to this second major mammary lineage. However, many questions concerning the role of basal myoepithelial cells in mammary morphogenesis, functional differentiation and disease remain unanswered. Here, we discuss the mechanisms that control the myoepithelial cell differentiation essential for their contractile function, summarize new data concerning the roles played by cell-extracellular matrix (ECM), intercellular and paracrine interactions in the regulation of various aspects of the mammary basal myoepithelial cell functional activity. Finally, we analyze the contribution of the basal myoepithelial cells to the regenerative potential of the mammary epithelium and tumorigenesis.
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Affiliation(s)
- Mejdi Moumen
- CNRS, UMR 144 Institut Curie "Compartimentation et Dynamique Cellulaires", 26 rue d'Ulm, Paris cedex 05, France
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20
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Margadant C, Raymond K, Kreft M, Sachs N, Janssen H, Sonnenberg A. Integrin alpha3beta1 inhibits directional migration and wound re-epithelialization in the skin. J Cell Sci 2009; 122:278-88. [PMID: 19118220 DOI: 10.1242/jcs.029108] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.5] [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: 12/15/2022] Open
Abstract
Re-epithelialization after skin wounding requires both migration and hyperproliferation of keratinocytes. Laminin-332 is deposited during migration over the provisional matrix. To investigate the function of the laminin-332 binding integrin alpha3beta1 in wound re-epithelialization, we generated Itga3flox/flox; K14-Cre mice lacking the alpha3 subunit specifically in the basal layer of the epidermis. These mice are viable but display several skin defects, including local inflammation, hair loss, basement membrane duplication and microblistering at the dermal-epidermal junction, whereas hemidesmosome assembly and keratinocyte differentiation are not impaired. Wound healing is slightly faster in the absence of integrin alpha3beta1, whereas proliferation, the distribution of other integrins and the deposition of basement membrane proteins in the wound bed are unaltered. In vitro, cell spreading is rescued by increased surface expression of alpha6beta1 integrin in the absence of integrin alpha3. The alpha3-deficient keratinocytes migrate with an increased velocity and persistence, whereas proliferation, growth factor signaling, hemidesmosome assembly, and laminin-332 deposition appeared to be normal. We suggest that integrin alpha3beta1 delays keratinocyte migration during wound re-epithelialization, by binding to the laminin-332 that is newly deposited on the wound bed.
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Affiliation(s)
- Coert Margadant
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
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21
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Raymond K, Kreft M, Song JY, Janssen H, Sonnenberg A. Dual Role of alpha6beta4 integrin in epidermal tumor growth: tumor-suppressive versus tumor-promoting function. Mol Biol Cell 2007; 18:4210-21. [PMID: 17699601 PMCID: PMC2043572 DOI: 10.1091/mbc.e06-08-0720] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
An increased expression of the integrin alpha6beta4 is correlated with a poor prognosis in patients with squamous cell carcinomas. However, little is known about the role of alpha6beta4 in the early stages of tumor development. We have isolated cells from mouse skin (mouse tumor-initiating cells [mTICs]) that are deficient in both p53 and Smad4 and carry conditional alleles of the beta4 gene (Itgb4). The mTICs display many features of multipotent epidermal stem cells and produce well-differentiated tumors after subcutaneous injection into nude mice. Deletion of Itgb4 led to enhanced tumor growth, indicating that alpha6beta4 mediates a tumor-suppressive effect. Reconstitution experiments with beta4-chimeras showed that this effect is not dependent on ligation of alpha6beta4 to laminin-5, but on the recruitment by this integrin of the cytoskeletal linker protein plectin to the plasma membrane. Depletion of plectin, like that of beta4, led to increased tumor growth. In contrast, when mTICs had been further transformed with oncogenic Ras, alpha6beta4 stimulated tumor growth, as previously observed in human squamous neoplasms. Expression of different effector-loop mutants of Ras(V12) suggests that this effect depends on a strong activation of the Erk pathway. Together, these data show that depending on the mutations involved, alpha6beta4 can either mediate an adhesion-independent tumor-suppressive effect or act as a tumor promotor.
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Affiliation(s)
| | | | - Ji-Ying Song
- Experimental Animal Pathology, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands
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22
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Gondolesi G, Ghirardo S, Raymond K, Hoppenhauer L, Surillo D, Rumbo C, Fishbein T, Sansaricq C, Sauter B. The value of plasma citrulline to predict mucosal injury in intestinal allografts. Am J Transplant 2006; 6:2786-90. [PMID: 16952300 DOI: 10.1111/j.1600-6143.2006.01513.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Diagnosis of intestinal transplant rejection depends on clinical assessment, endoscopy and most importantly, histology of intestinal biopsies. Plasma citrulline levels (P-Cit) reflect functional enterocyte mass in nontransplant patients and have been evaluated in two small series after transplant. This study was designed to determine the sensitivity and specificity of P-Cit as diagnostic tool for allograft injury, especially to distinguish between viral enteritis and rejection. We prospectively collected 403 P-Cit samples within 24 h of intestinal biopsy in 49 patients. P-Cit levels were correlated with the mucosal damage and histopathological diagnoses. P-Cit levels in bowels with significant mucosal damage (i.e. moderate or severe rejection, viral enteritis, PTLD, ischemia reperfusion injury, allergic enteritis) were significantly lower than in intestines with no or mild injury (i.e. indeterminate or mild rejection, nonspecific enteritis): 22.9 +/- 15.4 versus 38 +/- 23.2 nmol/mL (p < 0.0001). Sensitivity and specificity of the test were 80% and 58.1% for rejection, and 56.5% and 66% for viral enteritis, thereby unable to distinguish between both entities. In conclusion, P-Cit reflects the extent of mucosal injury regardless of the etiology, but does not seem to be a predictive marker for rejection or viral enteritis, as its values may decline only when diffuse mucosal damage has occurred.
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Affiliation(s)
- G Gondolesi
- Intestinal Transplant Program, Recanati/Miller Transplantation Institute, Mount Sinai School of Medicine, NY, USA.
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Bajanca F, Luz M, Raymond K, Martins GG, Sonnenberg A, Tajbakhsh S, Buckingham M, Thorsteinsdóttir S. Integrin α6β1-laminin interactions regulate early myotome formation in the mouse embryo. Development 2006; 133:1635-44. [PMID: 16554364 DOI: 10.1242/dev.02336] [Citation(s) in RCA: 50] [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] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
We addressed the potential role of cell-laminin interactions during epaxial myotome formation in the mouse embryo. Assembly of the myotomal laminin matrix occurs as epaxial myogenic precursor cells enter the myotome. Most Myf5-positive and myogenin-negative myogenic precursor cells localise near assembled laminin, while myogenin-expressing cells are located either away from this matrix or in areas where it is being assembled. In Myf5nlacZ/nlacZ (Myf5-null) embryos, laminin,collagen type IV and perlecan are present extracellularly near myogenic precursor cells, but do not form a basement membrane and cells are not contained in the myotomal compartment. Unlike wild-type myogenic precursor cells, Myf5-null cells do not express the α6β1 integrin, a laminin receptor, suggesting that integrin α6β1-laminin interactions are required for myotomal laminin matrix assembly. Blockingα6β1-laminin binding in cultured wild-type mouse embryo explants resulted in dispersion of Myf5-positive cells, a phenotype also seen in Myf5nlacZ/nlacZ embryos. Furthermore, inhibition ofα6β1 resulted in an increase in Myf5 protein and ectopic myogenin expression in dermomyotomal cells, suggesting that α6β1-laminin interactions normally repress myogenesis in the dermomyotome. We conclude that Myf5 is required for maintaining α6β1 expression on myogenic precursor cells, and that α6β1 is necessary for myotomal laminin matrix assembly and cell guidance into the myotome. Engagement of laminin byα6β1 also plays a role in maintaining the undifferentiated state of cells in the dermomyotome prior to their entry into the myotome.
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Affiliation(s)
- Fernanda Bajanca
- Department of Animal Biology and Centre for Environmental Biology, Faculty of Sciences, University of Lisbon, 1749-016 Lisbon, Portugal
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Wilhelmsen K, Litjens SHM, Kuikman I, Tshimbalanga N, Janssen H, van den Bout I, Raymond K, Sonnenberg A. Nesprin-3, a novel outer nuclear membrane protein, associates with the cytoskeletal linker protein plectin. ACTA ACUST UNITED AC 2006; 171:799-810. [PMID: 16330710 PMCID: PMC2171291 DOI: 10.1083/jcb.200506083] [Citation(s) in RCA: 360] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Despite their importance in cell biology, the mechanisms that maintain the nucleus in its proper position in the cell are not well understood. This is primarily the result of an incomplete knowledge of the proteins in the outer nuclear membrane (ONM) that are able to associate with the different cytoskeletal systems. Two related ONM proteins, nuclear envelope spectrin repeat (nesprin)–1 and –2, are known to make direct connections with the actin cytoskeleton through their NH2-terminal actin-binding domain (ABD). We have now isolated a third member of the nesprin family that lacks an ABD and instead binds to the plakin family member plectin, which can associate with the intermediate filament (IF) system. Overexpression of nesprin-3 results in a dramatic recruitment of plectin to the nuclear perimeter, which is where these two molecules are colocalized with both keratin-6 and -14. Importantly, plectin binds to the integrin α6β4 at the cell surface and to nesprin-3 at the ONM in keratinocytes, suggesting that there is a continuous connection between the nucleus and the extracellular matrix through the IF cytoskeleton.
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Affiliation(s)
- Kevin Wilhelmsen
- Division of Cell Biology, Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands
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Sansaricq C, Pardo S, Balwani M, Grace M, Raymond K. Biochemical and molecular diagnosis of lipoamide dehydrogenase deficiency in a North American Ashkenazi Jewish family. J Inherit Metab Dis 2006; 29:203-4. [PMID: 16601893 DOI: 10.1007/s10545-006-0175-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
A late-onset presentation of lipoamide dehydrogenase (E3) deficiency is described in a North American Ashkenazi Jewish (AJ) family. Diagnosis was made by urine organic acid and molecular analyses.
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Affiliation(s)
- C Sansaricq
- Department of Human Genetics, Mount Sinai School of Medicine, New York, NY 10029, USA.
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Raymond K, Kreft M, Janssen H, Calafat J, Sonnenberg A. Keratinocytes display normal proliferation, survival and differentiation in conditional β4-integrin knockout mice. J Cell Sci 2005; 118:1045-60. [PMID: 15731010 DOI: 10.1242/jcs.01689] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.6] [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: 01/25/2023] Open
Abstract
The α6β4 integrin is located at the basal surface of keratinocytes, in hemidesmosomal structures that mediate stable adhesion of epidermal cells to the underlying basement membrane component laminin-5. The absence of α6β4 integrin causes junctional epidermolysis bullosa, a severe blistering disease of the skin leading to perinatal death, confirming its essential role in mediating strong keratinocyte adhesion. Several studies have suggested that α6β4 integrin can also regulate signaling cascades that control cell proliferation, survival and migration through a mechanism independent of its adhesive function. We have generated a conditional knockout mouse strain, in which the gene encoding the β4 integrin subunit (Itgb4) was inactivated only in small stretches of the skin. These mice were viable and permitted an accurate analysis of the consequences of the loss of β4 on various biological processes by comparing β4-positive and -negative parts of the skin in the same animal. Despite the complete loss of hemidesmosomes in regions lacking α6β4 integrin, the distribution of a range of adhesion receptors and basement membrane proteins was unaltered. Moreover, loss of α6β4 did not affect squamous differentiation, proliferation or survival, except for areas in which keratinocytes had detached from the basement membrane. These in vivo observations were confirmed in vitro by using immortalized keratinocytes – derived from β4-subunit conditional knockout mice – from which the gene encoding β4 had been deleted by Cre-mediated recombination. Consistent with the established role of α6β4 in adhesion strengthening, its loss from cells was found to increase their motility. Our findings clearly demonstrate that, after birth, epidermal differentiation, proliferation and survival all proceed normally in the absence of α6β4, provided that cell adhesion is not compromised.
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Affiliation(s)
- Karine Raymond
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
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Raymond K, Bergeret E, Avet-Rochex A, Griffin-Shea R, Fauvarque MO. A screen for modifiers of RacGAP(84C) gain-of-function in theDrosophilaeye revealed the LIM kinase Cdi/TESK1 as a downstream effector of Rac1 during spermatogenesis. J Cell Sci 2004; 117:2777-89. [PMID: 15169836 DOI: 10.1242/jcs.01123] [Citation(s) in RCA: 20] [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: 11/20/2022] Open
Abstract
In Drosophila, RotundRacGAP/RacGAP(84C) is critical to retinal organisation and spermatogenesis. We show that eye-directed expression of RacGAP(84C) or its GTPase activating protein (GAP) domain induces a dominant rough eye phenotype which we used as a starting point in a gain-of-function screen to identify new partners of RacGAP(84C). Proteins known to function in Ras, Rho and Rac signalling were identified confirming the essential role of RacGAP(84C) in crosstalk between GTPases. Other potential RacGAP(84C) partners identified by the screen are implicated in signal transduction, DNA remodelling, cytoskeletal organisation, membrane trafficking and spermatogenesis. This latter class includes the serine/threonine kinase Center divider (Cdi), which is homologous to the human LIM kinase, Testis specific kinase 1 (TESK1), involved in cytoskeleton control through Cofilin phosphorylation. Eye-directed expression of cdi strongly suppressed the phenotypes induced by either RacGAP(84C) gain-of-function or by the dominant negative form of Rac1, Rac1N17. These results are consistent with Cdi being a specific downstream target of Rac1. We showed that Rac1 and cdi are both expressed in Drosophila testis and that homozygous Rac1 mutants exhibit poor fertility that is further reduced by introducing a cdi loss-of-function mutation in trans. Thus, results from a misexpression screen in the eye led us to a putative novel Rac1-Cdi-Cofilin pathway, regulated by RacGAP(84C), coordinating Drosophila spermatogenesis.
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Affiliation(s)
- Karine Raymond
- CEA-Grenoble, Département de Réponse et Dynamique Cellulaires, UMR 5092, 17 rue des Martyrs, 38054 Grenoble CEDEX 9, France
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Gondolesi G, Fishbein T, Chehade M, Tschernia A, Magid M, Kaufman S, Raymond K, Sansaricq C, LeLeiko N. Serum citrulline is a potential marker for rejection of intestinal allografts. Transplant Proc 2002; 34:918-20. [PMID: 12034238 DOI: 10.1016/s0041-1345(02)02669-6] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- G Gondolesi
- The Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, NY 10029, USA
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Raymond K, Bergeret E, Dagher MC, Breton R, Griffin-Shea R, Fauvarque MO. The Rac GTPase-activating protein RotundRacGAP interferes with Drac1 and Dcdc42 signalling in Drosophila melanogaster. J Biol Chem 2001; 276:35909-16. [PMID: 11468292 DOI: 10.1074/jbc.m105779200] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
RhoGTPases are negatively regulated by GTPase-activating proteins (GAPs). Here we demonstrate that Drosophila RotundRacGAP is active in vitro on Drac1 and Dcdc42 but not Drho1. Similarly, in yeast, RotundRacGAP interacts specifically with Drac1 and Dcdc42, as well as with their activated V12 forms, showing a particularly strong interaction with Dcdc42V12. In the fly, lowering RotundRacGAP dosage specifically modifies eye defects induced by expressing Drac1 or Dcdc42 but not Drho1, confirming that Drac1 and Dcdc42 are indeed in vivo targets of RotundRacGAP. Furthermore, embryonic-directed expression of either RotundRacGAP, or dominant negative Drac1N17, transgenes induces similar defects in dorsal closure and inhibits Drac1-dependent cytoskeleton assembly at the leading edge. Expression of truncated forms of RotundRacGAP shows that the GAP domain of RotundRacGAP is essential for its function. Unexpectedly, transgenes encoding Drac1N17, Dcdc42N17, or RotundRacGAP do not affect the c-Jun N-terminal kinase-dependent gene expression of decapentaplegic and puckered, indicating that another Drac1-independent signal redundantly activates this pathway. Finally, in a situation where Drac1 is constitutively activated, RotundRacGAP greatly reduces the ectopic expression of decapentaplegic, possibly by negatively regulating Dcdc42.
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Affiliation(s)
- K Raymond
- Département de Biologie Moléculaire et Structurale, CEA-CNRS-UJF, UMR 5092, 17 rue des Martyrs, Grenoble 38054, France
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Bergeret E, Pignot-Paintrand I, Guichard A, Raymond K, Fauvarque MO, Cazemajor M, Griffin-Shea R. RotundRacGAP functions with Ras during spermatogenesis and retinal differentiation in Drosophila melanogaster. Mol Cell Biol 2001; 21:6280-91. [PMID: 11509670 PMCID: PMC87355 DOI: 10.1128/mcb.21.18.6280-6291.2001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [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: 11/20/2022] Open
Abstract
Our analysis of rotund (rn) null mutations in Drosophila melanogaster revealed that deletion of the rn locus affects both spermatid and retinal differentiation. In the male reproductive system, the absence of RnRacGAP induced small testes, empty seminal vesicles, short testicular cysts, reduced amounts of interspermatid membrane, the absence of individualization complexes, and incomplete mitochondrial condensation. Flagellar growth continued within the short rn null cysts to produce large bulbous terminations of intertwined mature flagella. Organization of the retina was also severely perturbed as evidenced by grossly misshapen ommatidia containing reduced numbers of photoreceptor and pigment cells. These morphological phenotypes were rescued by genomic rnRacGAP transgenes, demonstrating that RnRacGAP function is critical to spermatid and retinal differentiation. The testicular phenotypes were suppressed by heterozygous hypomorphic mutations in the Dras1 and drk genes, indicating cross talk between RacGAP-regulated signaling and that of the Ras pathway. The observed genetic interactions are consistent with a model in which Rac signaling is activated by Ras and negatively regulated by RnRacGAP during spermatid differentiation. RnRacGAP and Ras cross talk also operated during retinal differentiation; however, while the heterozygous hypomorphic drk mutation continued to act as a suppressor of the rn null mutation, the heterozygous hypomorphic Dras1 mutation induced novel retinal phenotypes.
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Affiliation(s)
- E Bergeret
- DBMS-CNRS UMR 5092, CEA-Grenoble, Grenoble, France
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Abstract
OBJECTIVES This study was performed to compare the long-term clinical efficacy of treatment with metoprolol versus carvedilol in patients with chronic heart failure. BACKGROUND Beta-adrenergic blockade is of proven value in chronic heart failure. Metoprolol, a selective beta-blocker, is widely used, but recent trials suggest carvedilol, a nonselective beta-blocker with alpha-1-receptor antagonist activity and antioxidant activities, is also effective. It is uncertain, however, if these additional properties of carvedilol provide further clinical benefit compared with metoprolol. METHODS In this randomized double-blind control trial, 51 patients with chronic heart failure and mean left ventricular (LV) ejection fraction of 26% +/- 1.8% were randomly assigned treatment with metoprolol 50 mg twice daily or carvedilol 25 mg twice daily in addition to standard therapy after a four-week dose titration period for a total of 12 weeks. Response was assessed by a quality of life questionnaire, New York Heart Association class, exercise capacity (6-min walk test), radionucleotide ventriculography for LV ejection fraction, two-dimensional echocardiography measurement of LV dimensions and diastolic filling and 24-h electrocardiograph monitoring to assess heart rate variability. RESULTS Both carvedilol and metoprolol produced highly significant improvement in symptoms (p < 0.001), exercise capacity (p < 0.05) and LV ejection fraction (p < 0.001), and there were no significant differences between the two drugs. Carvedilol had a significantly greater effect on sitting and standing blood pressure, LV end-diastolic dimension and normalized the mitral E wave deceleration time. CONCLUSIONS Both metoprolol and carvedilol were equally effective in improving symptoms, quality of life, exercise capacity and LV ejection fraction, although carvedilol lowers blood pressure more than metoprolol.
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Affiliation(s)
- J E Sanderson
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR.
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Affiliation(s)
- K Raymond
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut, USA
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Raymond K, Griffin-Shea R, Fauvarque-Marras M. Rotundracgap and rho family signalling in drosophila development. Biol Cell 1999. [DOI: 10.1016/s0248-4900(99)90300-3] [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: 11/26/2022]
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Abstract
OBJECTIVES To study the pharmacokinetics of netilmicin in Chinese haematology-oncology patients and to determine the pharmacokinetic differences, if any, between this patient subpopulation of Chinese and Caucasians. METHODS A prospective study was carried out in the adult oncology unit of a major hospital in Hong Kong. During a 6 week period in 1997, all patients commencing on netilmicin therapy were monitored; the patients' demographics, clinical status, netilmicin dose and regimen, and drug administration/blood sampling time were collected. Pharmacokinetic parameters were generated using the USC*PACK package based on specifics of the patients themselves and Caucasians matched for the same patients' parameters using the Bayesian alogrithms. RESULTS A total of 22 patients were enrolled into the study. Twenty-nine sets of levels were drawn, but only 25 sets from 18 patients (86%) were interpretable. The predicted peak (7.47+/-1.46 microg ml-1 ) and trough levels (1.39+/-0.96 microg ml-1 ) generated by USC*PACK were found to be significantly higher than the levels observed (6.01+/-1.14 microg ml-1 and 0.93+/-0.71 microg ml-1, respectively). Netilmicin clearance, volume of distribution and rate of elimination were all significantly higher in this Chinese subpopulation than those predicted for matched Caucasians. Conclusion Alterations in the netilmicin pharmacokinetics observed in our study population might be related to the disease state and/or ethics of the study patient population. Direct application of Caucasian based population pharmacokinetic parameters to this subgroup of Chinese patients may not be appropriate and may result in underdose.
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Affiliation(s)
- S Chang
- Department of Pharmacy, The Chinese University of Hong Kong, Shatin, New Territories
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Abstract
Topiramate (TPM) is a novel antiepileptic medication (AED) with at least three mechanisms of action. A possible fourth mechanism, that of a carbonic anhydrase inhibitor, also may contribute to its antiepileptic properties. We report a patient with intractable epilepsy and normal renal function who developed a normal anion gap metabolic acidosis, which worsened during elective surgery for temporal lobectomy. We believe this side effect of TPM can become clinically significant during surgery, concomitant use of another carbonic anhydrase inhibitor, and potentially with the ketogenic diet.
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Affiliation(s)
- A Wilner
- Brown University, Providence, Rhode Island 02906, USA
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Chang S, Wong SY, Li RC, Chan LS, Chan AT, Zhu M, Raymond K. Utilization and monitoring of aminoglycosides in oncology patients at a Hong Kong government hospital. Ann Pharmacother 1999; 33:646-9. [PMID: 10369635 DOI: 10.1345/aph.18165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Rinaldo P, Yoon HR, Yu C, Raymond K, Tiozzo C, Giordano G. Sudden and unexpected neonatal death: a protocol for the postmortem diagnosis of fatty acid oxidation disorders. Semin Perinatol 1999; 23:204-10. [PMID: 10331471 DOI: 10.1016/s0146-0005(99)80052-4] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Fatty acid oxidation (FAO) disorders are frequently reported as the cause of sudden and unexpected death, but their postmortem identification remains difficult. Over a period of 5 years, the authors have identified 44 cases representing five FAO disorders and 19 additional cases without a diagnosis of a specific defect. Among the two groups, 13 patients died in the neonatal period, 10 in the FAO group, and three from the undetermined defect group. This outcome was consistently associated with exclusive breast feeding and presumably poor caloric intake. The diagnosis of FAO disorder in these cases was based on the analysis of postmortem liver and bile. In postmortem liver, informative findings are microvesicular steatosis, elevated fatty acid concentrations, glucose depletion, and low carnitine concentration. Bile carnitine analysis and acylcarnitine profiling have expanded significantly the effectiveness of the initial protocol and could lead, based on preliminary observations, to better identification of patients who may have been missed or left undetermined by the analysis of liver only. If an autopsy is not performed, informative findings can still be obtained by analysis of blood spots collected for newborn screenings and by biochemical testing of parents and asymptomatic siblings.
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Affiliation(s)
- P Rinaldo
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA
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Grein S, Raymond K, Cochet C, Pyerin W, Chambaz EM, Filhol O. Searching interaction partners of protein kinase CK2beta subunit by two-hybrid screening. Mol Cell Biochem 1999; 191:105-9. [PMID: 10094398] [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: 02/11/2023]
Abstract
To date, the intracellular regulation of protein kinase CK2 is unknown. However it was observed that the enzyme associates with several intracellular proteins and the formation of such molecular complexes may represent a mechanism for the control of CK2 activity. Using the Interaction Trap system in yeast, with the CK2beta as a bait, we looked for CK2 partners. We present the identification of new potential partners of CK2beta and it is hoped that their classification will help in understanding the physiological roles and the regulation of CK2 in the cell.
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Affiliation(s)
- S Grein
- Biochemische Zellphysiologie, Deutsches Krebsforschungszentrum, Heidelberg, Germany
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Abstract
Inborn errors of fatty acid oxidation (FAO) represent a group of metabolic disorders that has brought forward many interesting developments, as highlighted by the rapid pace of discovery of new defects and by the recognition of an ever-increasing spectrum of clinical phenotypes. This review includes a clinical and biochemical summary of the FAO disorders known to date, a synopsis of four recently discovered defects (short-chain 3-hydroxy acyl-CoA [coenzyme A] dehydrogenase deficiency, medium-chain 3-ketoacyl-CoA thiolase deficiency, 3-hydroxy-3-methylglutaryl-CoA synthase deficiency, and long-chain fatty acid transport deficiency) and of two susceptibility variations in the short-chain acyl-CoA dehydrogenase gene, and guidelines for the biochemical work-up of candidate patients.
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Affiliation(s)
- P Rinaldo
- Mayo Clinic, Department of Laboratory Medicine and Pathology, Rochester, MN 55905, USA
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Chang S, Chan WH, Kong Y, Chan GM, Raymond K, Lee A, Lee SC, Critchley JA, Chan JC. Use of indapamide in hospital and community clinics and its effect on plasma potassium in Chinese patients. J Clin Pharm Ther 1998; 23:295-302. [PMID: 9867313 DOI: 10.1046/j.1365-2710.1998.00162.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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: 11/20/2022]
Abstract
OBJECTIVES To investigate the usage pattern of indapamide and other antihypertensive drugs in patients attending a community-based government outpatient clinic (GOPC) or a hospital-based specialist clinic (SC). The plasma potassium concentrations of patients receiving indapamide and other diuretics were also examined. METHOD Prescriptions from the SC and the GOPC were reviewed and collected during January 1998. Patients' plasma potassium concentrations and the date of initiation of each medication were retrieved from the hospital computer databases at SC. An age- and sex-matched control group of patients on non-diuretic antihypertensive drugs was identified. RESULTS A total of 1648 and 773 prescriptions were collected from the SC during a 1-week period and GOPC during a 1-month period, respectively. Approximately half (45%) of the patients received antihypertensive treatment. Indapamide was five times more frequently prescribed in GOPC than SC (84.7 vs. 17.7%, P<0.001). Calcium channel blocking agents were the commonest antihypertensive drugs used in both clinics. The mean plasma potassium concentration of patients taking indapamide was lower than that of the control group (P = 0.037). Multiple linear regression analysis showed that consumption of indapamide (P =0.002) and duration of diuretic therapy (P = 0.023) were significantly related to changes in plasma potassium concentrations [multiple regression equation for potassium level = 4.09-0.145 (thiazide = 1)-0.377 (indapamide = 1) -0.00468 (duration of diuretic therapy in months)]. CONCLUSION Indapamide was used extensively in the community clinic and less in the hospital-based outpatient clinic. Patients receiving indapamide had a significantly lower plasma potassium concentration as compared to other diuretics or antihypertensive groups and this was predicted by a multiple linear regression model. Monitoring plasma electrolytes before initiation of indapamide treatment and at regular intervals thereafter is essential for detecting the hypokalaemia that may occur in Chinese patients.
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Affiliation(s)
- S Chang
- Department of Pharmacy, The Chinese University of Hong Kong, Shatin, New Territories.
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Sanderson JE, Chan SK, Yu CM, Yeung LY, Chan WM, Raymond K, Chan KW, Woo KS. Beta blockers in heart failure: a comparison of a vasodilating beta blocker with metoprolol. Heart 1998; 79:86-92. [PMID: 9505927 PMCID: PMC1728575 DOI: 10.1136/hrt.79.1.86] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE To determine whether a third generation vasodilating beta blocker (celiprolol) has long term clinical advantages over metoprolol in patients with chronic heart failure. DESIGN A double blind placebo controlled randomised trial. SETTING University teaching Hospital. PATIENTS 50 patients with stable chronic heart failure (NYHA class II-IV) due to idiopathic dilated, ischaemic, or hypertensive cardiomyopathy, with left ventricular ejection fraction < 0.45. INTERVENTIONS Celiprolol 200 mg daily (n = 21), metoprolol 50 mg twice daily (n = 19), or placebo (n = 10) for three months with a four week dose titration period. After the double blind period, patients entered an open label study (with placebo group receiving beta blockers) and were assessed after one year. MAIN OUTCOME MEASURES Clinical response, efficacy, and tolerance were assessed by the Minnesota heart failure symptom questionnaire six minute walk test, Doppler echocardiography (systolic and diastolic function), radionuclide ventriculography, and atrial and brain natriuretic peptides measured at baseline and after three months. RESULTS In the metoprolol group at 12 weeks v baseline there was a 47% reduction in symptom score (p < 0.001), improvement of NYHA class (mean (SEM), 2.6 (0.12) to 1.9 (0.13), p = 0.001), exercise distance (1246 (54) to 1402 (52) feet, p < 0.001), and left ventricular ejection fraction (26.9(3.1)% to 31(3.0)%, p = 0.016), and a fall in heart rate (resting, 79 (3) to 62 (3) beats/min, p < 0.001). In the celiprolol group there was a 38% reduction in symptom score (p = 0.02), less improvement in exercise distance (1191 (55) to 1256 (61) feet, p = 0.05), and no significant changes in NYHA class, left ventricular ejection fraction, or heart rate. Mortality at one year was 11% in metoprolol and 19% in the celiprolol group, and symptomatic improvement was maintained in the survivors. CONCLUSIONS Both drugs were well tolerated but the vasodilator properties of celiprolol do not seem to provide any obvious additional benefit in the long term treatment of heart failure.
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Affiliation(s)
- J E Sanderson
- Department of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital.
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Chang S, Wong JW, Wong CW, Chiu HC, Raymond K. Overview of the hospital formulary systems in Hong Kong. Princess Margaret Hospital as a baseline. Ann Pharmacother 1997; 31:1526-31. [PMID: 9416394 DOI: 10.1177/106002809703101214] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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
OBJECTIVE To investigate the popularity of formulary systems in all Hong Kong hospitals and to compare these with the newly introduced formulary system in a major government hospital, the Princess Margaret Hospital (PMH), as the baseline. DESIGN Questionnaire and selected interviews by pharmacy students. SETTING All hospital pharmacies in Hong Kong. PARTICIPANTS Department managers (directors of pharmacy services) of hospital pharmacies. MAIN OUTCOME MEASURE The popularity of the hospitals' formulary systems and their formulary decision-making strategies. Calculations of cost savings of the new formulary system in PMH and a comparison of the PMH system with the US standards were also made. RESULTS Among 38 responding hospitals, 35 (92%) had a formulary handbook and 21 (55.3%) claimed to have a formulary system. The evaluation processes and formulary decision-making procedures were found to be inadequate because basic components in drug evaluation (e.g., standardized criteria for drug evaluation) were not used regularly. However, the formulary system in PMH was found to be comparable with the US standards. Substantial cost savings were made through rejection of less cost-effective drugs by the Formulary Subcommittee in PMH. CONCLUSIONS In general, comprehensive formulary systems are still not popular in Hong Kong. This may be due to insufficient staffing and lack of administrative and physicians' support. The new formulary system in PMH can be used as a model to develop a successful formulary system in which hospital pharmacists can prove their expertise for the benefit of both hospitals and patients in Hong Kong.
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Affiliation(s)
- S Chang
- Department of Pharmacy, Faculty of Medicine, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
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Li RC, Zhu ZY, Lee SW, Raymond K, Ling JM, Cheng AF. Antibiotic exposure and its relationship to postantibiotic effect and bactericidal activity: constant versus exponentially decreasing tobramycin concentrations against Pseudomonas aeruginosa. Antimicrob Agents Chemother 1997; 41:1808-11. [PMID: 9257767 PMCID: PMC164011 DOI: 10.1128/aac.41.8.1808] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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
In vitro postantibiotic effects (PAEs) exhibited by a standard strain of Pseudomonas aeruginosa following exposure to tobramycin at constant concentrations were compared to those at exponentially decreasing concentrations. Exposure to a constant concentration showed more extensive bacterial killing and resulted in longer PAEs at comparable areas under the concentration-time curves above the MIC. This phenomenon suggests a significant contribution of pharmacokinetics to antimicrobial pharmacodynamics.
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Affiliation(s)
- R C Li
- Department of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Shatin.
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Chiu FC, Zhang JN, Li RC, Raymond K. Efficient assay for the determination of atenolol in human plasma and urine by high-performance liquid chromatography with fluorescence detection. J Chromatogr B Biomed Sci Appl 1997; 691:473-7. [PMID: 9174286 DOI: 10.1016/s0378-4347(96)00454-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
An efficient method for the determination of atenolol in human plasma and urine was developed and validated. alpha-Hydroxymetoprolol, a compound with a similar polarity to atenolol, was used as the internal standard in the present high-performance liquid chromatographic analysis with fluorescence detection. The assay was validated for the concentration range of 2 to 5000 ng/ml in plasma and 1 to 20 microg/ml in urine. For both plasma and urine, the lower limit of detection was 1 ng/ml. The intra-day and inter-day variabilities for plasma samples at 40 and 900 ng/ml, and urine samples at 9.5 microg/ml were <3% (n=5).
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Affiliation(s)
- F C Chiu
- Department of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Shatin NT
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Li RC, Chow AH, Ho SS, Raymond K. Mathematical evaluation of the influence of adverse effect on therapeutic efficacy in a direct response system: a case of pharmacodynamic variability of adverse effect. Am J Ther 1997; 4:92-8. [PMID: 10423598 DOI: 10.1097/00045391-199702000-00007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Two major concerns in therapeutics are the efficacy (E) and adverse effects (Ae) exhibited by a pharmacological agent. Although these elements are studied routinely in both animals and humans during the drug development processes, the data are usually considered independently and in different contexts. Since E and Ae are different yet inseparable components in drug therapy, E should not be used as the sole descriptor for drug responses. To accommodate the influence of Ae on E, the present approach requires the observed Ae data to be transformed to the equivalencies of E data (Ae'). Using appropriate pharmacokinetic modeling techniques, this approach permits the prediction of the adjusted therapeutic effect (ATE) (i.e. , E minus Ae') as a function of time. Effects of pharmacodynamic variability of Ae due to variations in Hill's parameters (i.e., Ae (max), AeC (50), and n (Ae) ) on ATE were studied by computer simulations for a hypothetical one-compartment model drug that displays simple first-order absorption and elimination with central sites for E and Ae. An increase in Ae' (max) and a decrease in AeC (50) and n (Ae) cause a downward shift and peak inversion on the ATE versus time curves coupling with a longer duration of influence of Ae on E. Results also showed that the downward shift of these curves was more apparent with decreasing n (Ae) values and that peak inversion became less noticeable for n (Ae) values <1.5. Subsequent analyses established the optimal dose for the hypothetical drug studied. This approach allows a more comprehensive description of the time course of the overall drug responses and is potentially useful for therapeutic drug monitoring and dose selection during the drug development process.
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Affiliation(s)
- R C Li
- Department of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong
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Chiu FC, Raymond K. Validated assay for the determination of celiprolol in plasma using high-performance liquid chromatography and a silanol deactivated reversed-phase support. J Chromatogr B Biomed Appl 1996; 687:462-5. [PMID: 9017473 DOI: 10.1016/s0378-4347(96)00246-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Previously reported methods for the determination of celiprolol in plasma could not be satisfactorily employed due to interference from plasma components. Thus, an improved, convenient and efficient method for the determination of the plasma concentration of celiprolol was developed using a simple solvent extraction step followed by high-performance liquid chromatography on a silanol deactivated C18 column with fluorescence detection. The plasma interference was resolved from celiprolol and the typical trailing of basic compounds on reversed-phase HPLC was eliminated. The peak-area ratio versus plasma concentration was linear over the range of 5-1000 ng/ml and the detection limit was 5 ng/ml.
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Affiliation(s)
- F C Chiu
- Department of Pharmacy, Faculty of Medicine, Chinese University of Hong Kong, Shatin, NT, Hong Kong
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Sanderson JE, Chan WW, Hung YT, Chan SK, Shum IO, Raymond K, Woo KS. Effect of low dose beta blockers on atrial and ventricular (B type) natriuretic factor in heart failure: a double blind, randomised comparison of metoprolol and a third generation vasodilating beta blocker. Br Heart J 1995; 74:502-7. [PMID: 8562234 PMCID: PMC484069 DOI: 10.1136/hrt.74.5.502] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
OBJECTIVES This study examines the acute effects of two differing beta adrenergic blocking agents (metoprolol and a third generation vasodilating beta blocker) on plasma concentrations of atrial natriuretic factor (ANF), brain (ventricular) natriuretic factor (BNF), and haemodynamic variables in patients with heart failure. SETTING University teaching hospital. METHODS 20 patients with impaired left ventricular systolic function [ejection fraction 32 (SEM 2.3)%] were randomised in a double blind manner to receive either oral metoprolol 6.25 mg twice daily or celiprolol 25 mg daily. Haemodynamic variables were evaluated by Swan-Ganz pulmonary artery catheter over 24 hours. ANF and BNF concentrations were measured at baseline, 5 h, and 24 h by radioimmunoassay. RESULTS At baseline ANF and BNF concentrations were considerably raised compared to the normal range. Treatment with metoprolol caused ANF to rise further to 147% of the basal level at 5 h (P = 0.017) and 112% at 24 h (P = 0.029). This was associated with a small but non-significant rise in pulmonary capillary wedge pressure. Cardiac output and systemic vascular resistance were unchanged at 24 h. In contrast, after celiprolol ANF fell to 90% of basal levels at 5 h and to 74% of basal level at 24 h (P = 0.019), associated with a small but non-significant fall in pulmonary capillary wedge pressure [-3.3 (2.7) mm Hg] and systemic vascular resistance, and rise in cardiac output from 3.2 (0.2) to 4.0 (0.4) l/min (P = 0.04). BNF concentrations rose to 112% of baseline at 5 h (P = 0.09) after metoprolol but fell slightly, to 91% of baseline values, after celiprolol (NS). CONCLUSIONS Metoprolol, even in very low doses (6.25 mg), produced a rise in ANF and BNF, although minimal haemodynamic changes were detected. In contrast, a vasodilating beta blocker was associated with a significant fall in ANF and BNF and a small rise in cardiac output. This study confirms both the advantages of vasodilating beta blockers over metoprolol for initial treatment of heart failure and the usefulness of ANF and BNF measurements for the assessment of drug effects in heart failure compared to traditional haemodynamic measurements.
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Affiliation(s)
- J E Sanderson
- Department of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong
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Abstract
OBJECTIVE To study the attitudes and knowledge of pharmacists in Hong Kong toward the reporting of adverse drug reactions (ADRs). METHODS In December 1993, all pharmacists who were working in retail shops (n = 230), hospitals (n = 44), or outpatient clinics (n = 12) in Hong Kong were sent a questionnaire as well as a letter explaining the purpose of the survey. RESULTS One hundred and twenty-nine pharmacists (retail pharmacies 40.4 percent, hospitals 68.2 percent, outpatient clinics 50 percent) responded. Although 93 percent of the pharmacists in this survey agreed that it is necessary to report ADRs, a much smaller proportion (14.7 percent) had actually done so in the previous 12 months. Most pharmacists (87.4 percent) were not aware of any ADR reporting system in Hong Kong. There did not appear to be a relationship between ADR reporting and the length or place of practice, workload, or patient contact time. Severe or unusual ADRs and ADRs to new products were perceived to be significant enough to report. CONCLUSIONS The great majority of pharmacists in Hong Kong agreed on the necessity of reporting ADRs. The lack of knowledge of an ADR reporting program might have led to nonreporting in the past. It is important that there be continuing efforts to promote ADR reporting programs.
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Affiliation(s)
- K K Lee
- Department of Pharmacy, Chinese University of Hong Kong, Shatin, New Territories
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Abstract
Three age groups of Bulinus natalensis, immature, mature but not yet egg-laying and mature egg-laying, were infected with miracidia of Schistosoma margrebowiei. The growth of infected, exposed but showing no signs of infection, and uninfected control groups, were examined at weekly intervals for ten weeks post exposure. Snails exposed to infection when immature, even in the group where no patent development ensued, showed a statistically significant reduction in growth and this was evident as early as 2-5 weeks post exposure. When infection occurred at the stage prior to egg-laying a significant reduction in growth was seen but only in the group which developed a patent infection. This was also the case for the egg-laying group although the reduction in growth was only significant in the final three weeks of the experiment. Thus in all three age groups, growth rate was reduced and the infected snails were significantly smaller at the end of ten weeks compared with the controls. The reasons for these effects are discussed.
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Affiliation(s)
- K Raymond
- School of Biological Sciences, University of Wales, Bangor, Gwynedd, UK
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