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Haque AKMA, Weinmann P, Biswas S, Handgretinger R, Mezger M, Kormann MSD, Antony JS. RNA ImmunoGenic Assay: A Method to Detect Immunogenicity of in vitro Transcribed mRNA in Human Whole Blood. Bio Protoc 2020; 10:e3850. [PMID: 33855105 PMCID: PMC8032499 DOI: 10.21769/bioprotoc.3850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 09/24/2020] [Accepted: 09/28/2020] [Indexed: 11/02/2022] Open
Abstract
The mRNA therapeutics is a new class of medicine to treat many various diseases. However, in vitro transcribed (IVT) mRNA triggers immune responses due to recognition by human endosomal and cytoplasmic RNA sensors, but incorporation of modified nucleosides have been shown to reduce such responses. Therefore, an assay signifying important aspects of the human immune system is still required. Here, we present a simple ex vivo method called 'RNA ImmunoGenic Assay' to measure immunogenicity of IVT-mRNAs in human whole blood. Chemically modified and unmodified mRNA are complexed with a transfection reagent (TransIT), and co-incubated in human whole blood. Specific cytokines are measured (TNF-α, INF-α, INF-γ, IL-6 and IL-12p70) using ELISAs. The qPCR analysis is performed to reveal the activation of specific immune pathways. The RNA ImmunoGenic Assay provides a simple and fast method to detect donor specific - immune response against mRNA therapeutics. Graphic abstract: Schematic representation of RNA ImmunoGenic Assay.
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Affiliation(s)
- AKM Ashiqul Haque
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
| | - Petra Weinmann
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
| | - Sumit Biswas
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
| | - Rupert Handgretinger
- University Children's Clinic Department of Paediatrics I, Hematology and Oncology, University of Tuebingen, Germany
| | - Markus Mezger
- University Children's Clinic Department of Paediatrics I, Hematology and Oncology, University of Tuebingen, Germany
| | - Michael S. D. Kormann
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
| | - Justin S Antony
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Germany
- University Children's Clinic Department of Paediatrics I, Hematology and Oncology, University of Tuebingen, Germany
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Philip M, Tessonnier L, Mancini J, Mainardi JL, Lussato D, Cammillieri S, Weinmann P, Hagege A, Gouriet F, Camoin L, Casalta JP, Riberi A, Drancourt M, Lepidi H, Habib G. 333018F-Fluorodeoxyglucose Positron Emission Tomography Computed Tomography (PET/CT) for the diagnosis of prosthetic valve infective endocarditis (PVIE): a prospective multicenter study. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0082] [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] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background and objectives
18F-FDG PET/CT has recently been added as a major criterion in the ESC 2015 infective endocarditis (IE) guidelines, but the value of this new diagnostic algorithm has never been prospectively assessed.
Purposes
1. Primary objective: to assess the value of the new ESC criteria including 18F-FDG PET/CT in prosthetic valve infective endocarditis (PVIE).
2. Secondary objectives: to determine the reproducibility of 18F-FDG PET/CT; to assess its ability to predict embolic events.
Methods
Between 2014 and 2017, 175 patients with suspected PVIE were prospectively included in 3 French centers. After exclusion of patients with uninterpretable or not feasible PET/CT,115 patients were finally included in the analysis, including 91 definite IE and 24 rejected IE, as defined by an expert Consensus of Endocarditis Team after 3-month follow-up as Gold Standard
Nuclear data were blindly analyzed by two independent nuclear medicine physicians.
Patients follow-up was scheduled at one and three months after hospitalization
Results
Significant cardiac uptake by PET/CT (major criterion) was observed in 67 among 91 patients with definite PVIE and 6 patients with rejected IE (sensitivity 73.6%, specificity 75%, positive predictive value 91%, negative predictive value 42%). Considering cardiac uptake as a major criterion, the ESC 2015 classification increased the sensitivity of Duke criteria from 57 to 84% (p<0.001) but decreased its specificity from 84 to 70% (p<0.001).
Intraobserver reproducibility of cardiac uptake evaluation was good (kappa = 0.84) but inter observer reproductibility was less satisfactory (kappa = 0.63).
Embolic events occurred in 31 patients (27%) and were correlated with vegetation size by ECHO (p<0.001), Staphylococcus infection (p=0.003), and PET/CT cardiac uptake (p=0.02).
Conclusion
1. the value of PET CT and ESC criteria is confirmed and may allow earlier diagnosis of PVIE
2. PET CT is associated with an increased risk of false positive results probably related to the technical improvements
3. Reproducibility of nuclear measurements seems unsatisfactory, justifying efforts to standardize PET studies interpretation
4. Our study describes for the first time a positive correlation between a positive PET/Ct and occurrence of embolic events, warranting additional studies.
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Affiliation(s)
- M Philip
- La Timone Hospital, Marseille, France
| | | | - J Mancini
- La Timone Hospital, Marseille, France
| | - J L Mainardi
- Hopital Europeen Georges Pompidou - University Paris Descartes, Paris, France
| | - D Lussato
- Centre Cardiologique du Nord (CCN), Paris, France
| | | | - P Weinmann
- Hopital Europeen Georges Pompidou - University Paris Descartes, Paris, France
| | - A Hagege
- Hopital Europeen Georges Pompidou - University Paris Descartes, Paris, France
| | - F Gouriet
- La Timone Hospital, Marseille, France
| | - L Camoin
- La Timone Hospital, Marseille, France
| | | | - A Riberi
- La Timone Hospital, Marseille, France
| | | | - H Lepidi
- La Timone Hospital, Marseille, France
| | - G Habib
- La Timone Hospital, Marseille, France
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Sahu I, Haque AKMA, Schweizer GR, Weidensee B, Weinmann P, Loretz B, Lehr CM, Michel T, Wendel HP, Kormann MSD. Chemical-Modified mRNA Therapy for Cystic Fibrosis by Targeting Lung Cells. COPD 2019. [DOI: 10.1080/15412555.2019.1613775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Itishri Sahu
- Kinder Klinik, University Klinik Tuebingen, Tuebingen, Germany
| | | | | | - Brian Weidensee
- Kinder Klinik, University Klinik Tuebingen, Tuebingen, Germany
| | - Petra Weinmann
- Kinder Klinik, University Klinik Tuebingen, Tuebingen, Germany
| | - Brigitta Loretz
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Saarbrucken, Germany
| | - Claus Michael Lehr
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Saarbrucken, Germany
- Department of Pharmacy, Saarland University, Saarbrucken, Germany
| | - Tatjana Michel
- Department of Thoracic and Cardiovascular Surgery, Clinical Research Laboratory, University Medical Center, Tuebingen, Germany
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Antony JS, Latifi N, Haque AKMA, Lamsfus-Calle A, Daniel-Moreno A, Graeter S, Baskaran P, Weinmann P, Mezger M, Handgretinger R, Kormann MSD. Gene correction of HBB mutations in CD34 + hematopoietic stem cells using Cas9 mRNA and ssODN donors. Mol Cell Pediatr 2018; 5:9. [PMID: 30430274 PMCID: PMC6236008 DOI: 10.1186/s40348-018-0086-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [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: 01/26/2018] [Accepted: 10/17/2018] [Indexed: 12/13/2022] Open
Abstract
Background β-Thalassemia is an inherited hematological disorder caused by mutations in the human hemoglobin beta (HBB) gene that reduce or abrogate β-globin expression. Although lentiviral-mediated expression of β-globin and autologous transplantation is a promising therapeutic approach, the risk of insertional mutagenesis or low transgene expression is apparent. However, targeted gene correction of HBB mutations with programmable nucleases such as CRISPR/Cas9, TALENs, and ZFNs with non-viral repair templates ensures a higher safety profile and endogenous expression control. Methods We have compared three different gene-editing tools (CRISPR/Cas9, TALENs, and ZFNs) for their targeting efficiency of the HBB gene locus. As a proof of concept, we studied the personalized gene-correction therapy for a common β-thalassemia splicing variant HBBIVS1–110 using Cas9 mRNA and several optimally designed single-stranded oligonucleotide (ssODN) donors in K562 and CD34+ hematopoietic stem cells (HSCs). Results Our results exhibited that indel frequency of CRISPR/Cas9 was superior to TALENs and ZFNs (P < 0.0001). Our designed sgRNA targeting the site of HBBIVS1–110 mutation showed indels in both K562 cells (up to 77%) and CD34+ hematopoietic stem cells—HSCs (up to 87%). The absolute quantification by next-generation sequencing showed that up to 8% site-specific insertion of the NheI tag was achieved using Cas9 mRNA and a chemically modified ssODN in CD34+ HSCs. Conclusion Our approach provides guidance on non-viral gene correction in CD34+ HSCs using Cas9 mRNA and chemically modified ssODN. However, further optimization is needed to increase the homology directed repair (HDR) to attain a real clinical benefit for β-thalassemia. Electronic supplementary material The online version of this article (10.1186/s40348-018-0086-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Justin S Antony
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Tuebingen, Germany.,University Children's Hospital, Department of Pediatrics I, University of Tuebingen, Tuebingen, Germany.,Department of Hematology, Oncology, Clinical Immunology, University of Tuebingen, Tuebingen, Germany
| | - Ngadhnjim Latifi
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Tuebingen, Germany
| | - A K M Ashiqul Haque
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Tuebingen, Germany
| | - Andrés Lamsfus-Calle
- University Children's Hospital, Department of Pediatrics I, University of Tuebingen, Tuebingen, Germany
| | - Alberto Daniel-Moreno
- University Children's Hospital, Department of Pediatrics I, University of Tuebingen, Tuebingen, Germany
| | - Sebastian Graeter
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Tuebingen, Germany
| | - Praveen Baskaran
- Center for Quantitative Biology, University of Tuebingen, Tuebingen, Germany
| | - Petra Weinmann
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Tuebingen, Germany
| | - Markus Mezger
- University Children's Hospital, Department of Pediatrics I, University of Tuebingen, Tuebingen, Germany
| | - Rupert Handgretinger
- University Children's Hospital, Department of Pediatrics I, University of Tuebingen, Tuebingen, Germany
| | - Michael S D Kormann
- Department of Pediatrics I, Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy in Pediatrics, University of Tuebingen, Tuebingen, Germany.
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5
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Haque AKMA, Dewerth A, Antony JS, Riethmüller J, Schweizer GR, Weinmann P, Latifi N, Yasar H, Pedemonte N, Sondo E, Weidensee B, Ralhan A, Laval J, Schlegel P, Seitz C, Loretz B, Lehr CM, Handgretinger R, Kormann MSD. Chemically modified hCFTR mRNAs recuperate lung function in a mouse model of cystic fibrosis. Sci Rep 2018; 8:16776. [PMID: 30425265 PMCID: PMC6233194 DOI: 10.1038/s41598-018-34960-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 09/28/2018] [Indexed: 12/15/2022] Open
Abstract
Gene therapy has always been a promising therapeutic approach for Cystic Fibrosis (CF). However, numerous trials using DNA or viral vectors encoding the correct protein resulted in a general low efficacy. In the last years, chemically modified messenger RNA (cmRNA) has been proven to be a highly potent, pulmonary drug. Consequently, we first explored the expression, function and immunogenicity of human (h)CFTR encoded by cmRNAhCFTR in vitro and ex vivo, quantified the expression by flow cytometry, determined its function using a YFP based assay and checked the immune response in human whole blood. Similarly, we examined the function of cmRNAhCFTR in vivo after intratracheal (i.t.) or intravenous (i.v.) injection of the assembled cmRNAhCFTR together with Chitosan-coated PLGA (poly-D, L-lactide-co-glycolide 75:25 (Resomer RG 752 H)) nanoparticles (NPs) by FlexiVent. The amount of expression of human hCFTR encoded by cmRNAhCFTR was quantified by hCFTR ELISA, and cmRNAhCFTR values were assessed by RT-qPCR. Thereby, we observed a significant improvement of lung function, especially in regards to FEV0.1, suggesting NP-cmRNAhCFTR as promising therapeutic option for CF patients independent of their CFTR genotype.
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Affiliation(s)
- A K M Ashiqul Haque
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany
| | - Alexander Dewerth
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany
| | - Justin S Antony
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany.,Department of Hematology, Oncology, Clinical Immunology, University of Tuebingen, Tuebingen, Germany
| | | | - Georg R Schweizer
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany
| | - Petra Weinmann
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany
| | - Ngadhnjim Latifi
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany
| | - Hanzey Yasar
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarbruecken, Germany
| | | | - Elvira Sondo
- U.O.C. Genetica Medica, Istituto Giannina Gaslini, Genova, Italy
| | - Brian Weidensee
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany
| | - Anjali Ralhan
- Department of Pediatrics I - Immunology and Pneumology/Cystic fibrosis, Department of Pediatrics I, University of Tuebingen, Tuebingen, Germany
| | - Julie Laval
- Department of Pediatrics I - Immunology and Pneumology/Cystic fibrosis, Department of Pediatrics I, University of Tuebingen, Tuebingen, Germany
| | - Patrick Schlegel
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany
| | - Christian Seitz
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany
| | - Brigitta Loretz
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarbruecken, Germany
| | - Claus-Michael Lehr
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Center for Infection Research (HZI), Saarbruecken, Germany.,Department of Pharmacy, Saarland University, Saarbruecken, Germany
| | - Rupert Handgretinger
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany.,Department of Hematology, Oncology, Clinical Immunology, University of Tuebingen, Tuebingen, Germany
| | - Michael S D Kormann
- Department of Pediatrics I - Pediatric Infectiology and Immunology, Translational Genomics and Gene Therapy, University of Tuebingen, Tuebingen, Germany.
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6
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Breton M, Thevenet H, Dallongeville A, Pouchot J, Jacquot C, Cornou C, Weinmann P. Un TEP-scan très anormal. Rev Med Interne 2017; 38:220-221. [DOI: 10.1016/j.revmed.2015.12.014] [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] [Received: 12/04/2015] [Accepted: 12/18/2015] [Indexed: 10/22/2022]
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Thevenet H, Ghazzar N, Pastre J, Weinmann P. Une dyspnée et un syndrome inflammatoire. Rev Med Interne 2015; 36:61-2. [DOI: 10.1016/j.revmed.2014.02.006] [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] [Received: 01/30/2014] [Accepted: 02/17/2014] [Indexed: 11/16/2022]
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Meinert F, Mark MJ, Kirilov E, Lauber K, Weinmann P, Grobner M, Daley AJ, Nagerl HC. Observation of many-body dynamics in long-range tunneling after a quantum quench. Science 2014; 344:1259-62. [DOI: 10.1126/science.1248402] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Meinert F, Mark MJ, Kirilov E, Lauber K, Weinmann P, Gröbner M, Nägerl HC. Interaction-induced quantum phase revivals and evidence for the transition to the quantum chaotic regime in 1D atomic Bloch oscillations. Phys Rev Lett 2014; 112:193003. [PMID: 24877938 DOI: 10.1103/physrevlett.112.193003] [Citation(s) in RCA: 5] [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: 09/16/2013] [Indexed: 06/03/2023]
Abstract
We study atomic Bloch oscillations in an ensemble of one-dimensional tilted superfluids in the Bose-Hubbard regime. For large values of the tilt, we observe interaction-induced coherent decay and matter-wave quantum phase revivals of the Bloch oscillating ensemble. We analyze the revival period dependence on interactions by means of a Feshbach resonance. When reducing the value of the tilt, we observe the disappearance of the quasiperiodic phase revival signature towards an irreversible decay of Bloch oscillations, indicating the transition from regular to quantum chaotic dynamics.
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Affiliation(s)
- F Meinert
- Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
| | - M J Mark
- Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
| | - E Kirilov
- Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
| | - K Lauber
- Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
| | - P Weinmann
- Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
| | - M Gröbner
- Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
| | - H-C Nägerl
- Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
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Meinert F, Mark MJ, Kirilov E, Lauber K, Weinmann P, Daley AJ, Nägerl HC. Quantum quench in an atomic one-dimensional Ising chain. Phys Rev Lett 2013; 111:053003. [PMID: 23952393 DOI: 10.1103/physrevlett.111.053003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Indexed: 06/02/2023]
Abstract
We study nonequilibrium dynamics for an ensemble of tilted one-dimensional atomic Bose-Hubbard chains after a sudden quench to the vicinity of the transition point of the Ising paramagnetic to antiferromagnetic quantum phase transition. The quench results in coherent oscillations for the orientation of effective Ising spins, detected via oscillations in the number of doubly occupied lattice sites. We characterize the quench by varying the system parameters. We report significant modification of the tunneling rate induced by interactions and show clear evidence for collective effects in the oscillatory response.
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Affiliation(s)
- F Meinert
- Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
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11
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Thevenet H, Jehanno N, Maunoury C, Weinmann P. [Increased uptake on PET/CT]. Rev Med Interne 2012. [PMID: 23195910 DOI: 10.1016/j.revmed.2012.10.375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- H Thevenet
- Service de médecine nucléaire, hôpital européen Georges-Pompidou, 20, rue Leblanc, 75015 Paris, France.
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Mekinian A, Jaccard A, Soussan M, Launay D, Berthier S, Federici L, Lefevre G, Weinmann P, Valeyre D, Dhôte R, Fain O. Intérêt du TEP-scan au cours de l’amylose AL. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.302] [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]
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Soussan M, Mekinian A, Brillet PY, Khafagy A, Nicolas P, Vessieres A, Fain O, Brauner M, Weinmann P. Les différents profils de la tuberculose en TEP/scanner au FDG. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.10.276] [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: 11/29/2022]
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Mourão AF, Canhão H, Moura RA, Cascão R, Weinmann P, Rodrigues A, Pereira J, Resende C, Capela S, Pereira da Silva JA, Fonseca JE. Predictors of chronicity and the discriminative value of the new ACR/EULAR rheumatoid arthritis classification criteria in an untreated polyarthritis cohort with less than 6 weeks of disease duration. Lab Invest 2010. [PMCID: PMC3007812 DOI: 10.1186/1479-5876-8-s1-p65] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Lalatonne Y, Monteil M, Jouni H, Serfaty JM, Sainte-Catherine O, Lièvre N, Kusmia S, Weinmann P, Lecouvey M, Motte L. Superparamagnetic bifunctional bisphosphonates nanoparticles: a potential MRI contrast agent for osteoporosis therapy and diagnostic. J Osteoporos 2010; 2010:747852. [PMID: 20981332 PMCID: PMC2957199 DOI: 10.4061/2010/747852] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Revised: 03/03/2010] [Accepted: 04/19/2010] [Indexed: 11/23/2022] Open
Abstract
A bone targeting nanosystem is reported here which combined magnetic contrast agent for Magnetic Resonance Imaging (MRI) and a therapeutic agent (bisphosphonates) into one drug delivery system. This new targeting nanoplatform consists of superparamagnetic γFe(2)O(3) nanoparticles conjugated to 1,5-dihydroxy-1,5,5-tris-phosphono-pentyl-phosphonic acid (di-HMBPs) molecules with a bisphosphonate function at the outer of the nanoparticle surface for bone targeting. The as-synthesized nanoparticles were evaluated as a specific MRI contrast agent by adsorption study onto hydroxyapatite and MRI measurment. The strong adsorption of the bisphosphonates nanoparticles to hydroxyapatite and their use as MRI T2(∗) contrast agent were demonstrated. Cellular tests performed on human osteosarcoma cells (MG63) show that γFe(2)O(3)@di-HMBP hybrid nanomaterial has no citoxity effect in cell viability and may act as a diagnostic and therapeutic system.
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Affiliation(s)
- Y. Lalatonne
- Laboratoire CSPBAT, C2B, FRE 3043 CNRS, Université Paris 13, 93017 Bobigny Cedex, France,Service de Médecine Nucléaire, Hôpital Avicenne, APHP, 93009 Bobigny Cedex, France,*Y. Lalatonne:
| | - M. Monteil
- Laboratoire CSPBAT, C2B, FRE 3043 CNRS, Université Paris 13, 93017 Bobigny Cedex, France
| | - H. Jouni
- Laboratoire CSPBAT, C2B, FRE 3043 CNRS, Université Paris 13, 93017 Bobigny Cedex, France
| | - J. M. Serfaty
- Service de Radiologie, Hôpital Bichat, APHP, U 698 ISERM, Université Paris 7, 75877 Paris Cedex 18, France
| | - O. Sainte-Catherine
- Laboratoire CSPBAT, C2B, FRE 3043 CNRS, Université Paris 13, 93017 Bobigny Cedex, France
| | - N. Lièvre
- UPRES 3410 Biothérapies Bénéfices et Risques, Université Paris 13, 93017 Bobigny Cedex, France
| | - S. Kusmia
- Plateforme d'IRM du Petit Animal, U 970 INSERM, Université Paris 5, 75908 Paris Cedex 10, France
| | - P. Weinmann
- Service de Médecine Nucléaire, Hôpital Avicenne, APHP, 93009 Bobigny Cedex, France
| | - M. Lecouvey
- Laboratoire CSPBAT, C2B, FRE 3043 CNRS, Université Paris 13, 93017 Bobigny Cedex, France
| | - L. Motte
- Laboratoire CSPBAT, C2B, FRE 3043 CNRS, Université Paris 13, 93017 Bobigny Cedex, France
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Schneider C, Huggenberger A, Sünner T, Heindel T, Strauss M, Göpfert S, Weinmann P, Reitzenstein S, Worschech L, Kamp M, Höfling S, Forchel A. Single site-controlled In(Ga)As/GaAs quantum dots: growth, properties and device integration. Nanotechnology 2009; 20:434012. [PMID: 19801767 DOI: 10.1088/0957-4484/20/43/434012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Results obtained by an advanced growth of site-controlled quantum dots (SCQDs) on pre-patterned nanoholes and their integration into both photonic resonators and nanoelectronic memories are summarized. A specific technique has been pursued to improve the optical quality of single SCQDs. Quantum dot (QD) layers have been vertically stacked but spectrally detuned for single SCQD studies. Thereby, the average emission linewidth of single QDs could be reduced from 2.3 meV for SCQDs in a first QD layer close to the etched nanoholes down to 600 microeV in the third InAs QD layer. Accurate SCQD nucleation on large QD distances is maintained by vertical strain induced QD coupling throughout the QD stacks. Record narrow linewidths of individual SCQDs down to approximately 110 microeV have been obtained. Experiments performed on coupled photonic SCQD-resonator devices show an enhancement of spontaneous emission. SCQDs have also been integrated deterministically in high electron mobility heterostructures and flash memory operation at room temperature has been observed.
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Affiliation(s)
- C Schneider
- Technische Physik, Physikalisches Institut, Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, Würzburg, Germany
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17
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Caetano-Lopes J, Nery AM, Henriques R, Canhão H, Duarte J, Amaral PM, Vale M, Moura RA, Pereira PA, Weinmann P, Abdulghani S, Souto-Carneiro M, Rego P, Monteiro J, Sakagushi S, Queiroz MV, Konttinen YT, Graça L, Vaz MF, Fonseca JE. Chronic arthritis directly induces quantitative and qualitative bone disturbances leading to compromised biomechanical properties. Clin Exp Rheumatol 2009; 27:475-482. [PMID: 19604441] [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: 05/28/2023]
Abstract
OBJECTIVES Rheumatoid arthritis (RA) is associated with an increased risk of fragility fractures. In RA patients, the direct effect of inflammation on bone is difficult to study because their skeleton is also affected by medication with corticosteroids and other drugs as well as aging and menopause, which contribute to bone fragility. This study used an animal model of chronic arthritis to evaluate the direct impact of chronic inflammation on biomechanical properties and structure of bone. METHODS In the SKG mouse chronic arthritis model three point bending tests were performed on femoral bones and compression tests on vertebral bodies. Collagen structure was analysed using second-harmonic generation (SHG) imaging with a two-photon microscope, ultramorphology by scanning electron microscopy (SEM) coupled with energy dispersive x-ray spectroscopy (EDS) and bone density using water pycnometer. RESULTS Arthritic bones had poor biomechanical quality compared to control bones. SHG, SEM and pycnometry disclosed variable signs of impaired collagen organization, poor trabecular architecture and low bone density. CONCLUSION Present data demonstrate for the first time that chronic inflammation per se, without confounding influence of drugs and aging, leads to impairment of bone biomechanics in terms of stiffness, ductility and ultimate strength (fracture).
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Affiliation(s)
- J Caetano-Lopes
- Rheumatology Research Unit, Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, 1649-028 Lisbon, Portugal
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18
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Weinmann P, Moura RA, Caetano-Lopes JR, Pereira PA, Canhão H, Queiroz MV, Fonseca JE. Delayed neutrophil apoptosis in very early rheumatoid arthritis patients is abrogated by methotrexate therapy. Clin Exp Rheumatol 2007; 25:885-887. [PMID: 18173925] [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: 05/25/2023]
Abstract
OBJECTIVES To analyse the activation state and apoptosis of circulating neutrophils in untreated very early rheumatoid arthritis (VERA) and after exposure to low dose corticosteroids and methotrexate (MTX). METHODS Neutrophils were isolated from the peripheral blood of VERA patients at 3 different times: before any treatment was started, 2 weeks after starting a low dose of prednisone (5-10 mg) and 4 months after reaching more than 20mg/week of MTX. The expression of different activation markers (CD11b, CD64, CD86 and CD69) in freshly isolated neutrophils was analysed by flow cytometry. Apoptosis was measured by the loss of DNA content, which was analysed by flow cytometry using propidium iodide. RESULTS Compared to neutrophils from healthy controls, we have found a delayed neutrophil apoptosis within 6 h and 22 h of cultured polymorphonuclear leukocytes (PMN) derived from VERA patients without any treatment or treated with corticosteroids. The delay of PMN apoptosis was restored to control levels after treatment with MTX. CONCLUSION The treatment of VERA patients with corticosteroids did not affect the delay of neutrophil apoptosis. However, delayed apoptosis was restored to control levels after treatment with low dose MTX, which highlights the importance of early RA treatment with MTX.
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Affiliation(s)
- P Weinmann
- Rheumatology Research Unit, Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal.
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Aubart F, Diebold B, Dhote R, Weinmann P, Valeyre D. [Cardiac sarcoidosis]. Rev Mal Respir 2003; 20:S45-9. [PMID: 15143310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Affiliation(s)
- F Aubart
- Service de Pneumologie, Hôpital Avicenne, Assistance Publique - Hôpitaux de Paris, Bobigny
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20
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Weinmann P, Marie PY. [Pulmonary scintigraphy in the diagnosis of pulmonary embolism]. Ann Cardiol Angeiol (Paris) 2003; 52:389-92. [PMID: 14752925 DOI: 10.1016/s0003-3928(03)00043-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
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21
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Hannequin P, Weinmann P, Mas J, Vinot S. Preliminary clinical results of photon energy recovery in simultaneous rest Tl-201/stress Tc-99m sestamibi myocardial SPECT. J Nucl Cardiol 2001; 8:144-51. [PMID: 11295691 DOI: 10.1067/mnc.2001.111799] [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: 11/22/2022]
Abstract
BACKGROUND The purpose of this study is to report the first clinical results obtained with the spectral deconvolution technique photon energy recovery (PER) for crosstalk correction in simultaneous rest thallium 201/stress technetium 99m sestamibi myocardial perfusion single photon emission computed tomography (SPECT). METHODS AND RESULTS Thirty-four patients with suspected coronary artery disease received Tl-201 (111-130 MBq) at rest, followed by single SPECT. Tc-99m sestamibi (444-518 MBq) was then injected at stress, followed by dual SPECT. Single SPECT data were processed to obtain the following data sets: single raw (conventional) Tl-201 and single PER (scatter-corrected) Tl-201. Dual SPECT data were processed to obtain the following data sets: dual raw Tl-201, dual PER (scatter- and crosstalk-corrected) Tl-201, dual raw Tc-99m, and dual PER (scatter-corrected) Tc-99m. All data sets were automatically analyzed with Cedars-Sinai Quantitative Perfusion SPECT software to derive the relative segmental uptake, the summed score, and the summed difference score. The relative segmental uptake, the summed score, and the number of patients with significant reversibility (summed difference score >2) were 74.84% +/- 12.79%, 3.44 +/- 3.07, and 13, respectively, for single raw Tl-201; 80.5% +/- 10.18%, 1.97 +/- 2.25, and 20, respectively, for dual raw Tl-201; 69.47% +/- 14.08%, 6.41 +/- 3.68, and 17, respectively, for single PER Tl-201; and 69.99% +/- 13.39%, 6.58 +/- 3.63, and 17, respectively, for dual PER Tl-201. The differences between single and dual raw Tl-201 data sets were highly significant, whereas there was no significant difference between PER-corrected Tl-201 data sets. CONCLUSIONS PER is quantitatively efficient to correct for crosstalk in patients investigated with simultaneous rest Tl-201/stress Tc-99m sestamibi myocardial SPECT.
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Affiliation(s)
- P Hannequin
- Centre d'Imagerie Nucléaire, Annecy, France.
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22
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Weinmann P, Crestani B, Tazi A, Genereau T, Mal H, Aubier M, Valeyre D, Moretti JL, Le Guludec D, Lebtahi R. 111In-pentetreotide scintigraphy in patients with Langerhans' cell histiocytosis. J Nucl Med 2000; 41:1808-12. [PMID: 11079487] [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: 02/18/2023] Open
Abstract
UNLABELLED Langerhans' cell histiocytosis is a granulomatous disease that may involve multiple organs and the prognosis of which is highly variable. Because the prognosis depends particularly on the number of tissues involved, the accurate identification of the organs involved by granulomatous lesions is of critical importance. We hypothesized that 111In-pentetreotide scintigraphy would be useful for evaluation of patients with Langerhans' cells histiocytosis. METHODS Thirteen patients (38.3+/-10.4 y) with Langerhans' cell histiocytosis (8 patients with unifocal lung disease, 5 with multifocal disease) received intravenous 111In-pentetreotide (111-222 MBq), and planar images were obtained at 24 h after injection. Pulmonary uptake was quantified using a lung-to-background ratio (L/B) and compared with a population of 10 normal scintigrams. For the other sites, uptake of radioactivity in disease-related areas was visually assessed. RESULTS Ten of 12 patients with lung involvement had increased lung uptake (UB, 2.23+/-0.49 versus 1.34+/-0.07; P < 0.001). In the patients with multifocal disease, increased 111In-pentetreotide uptake was found in disease-related areas such as the salivary glands, the skin, the soft tissues, and the bones. However, somatostatin receptor imaging was insensitive for detecting central nervous system and liver involvement and most skin lesions. CONCLUSION 111In-pentetreotide imaging may be useful in Langerhans' cell histiocytosis. Further study will indicate whether 111In-pentetreotide is a relevant tracer in the management of histiocytosis.
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Affiliation(s)
- P Weinmann
- Nuclear Medicine Department, Avicenne Hospital, Paris, France
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23
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Bousson V, Moretti JL, Weinmann P, Safi N, Tamgac F, Groiselle C, de Beco V, Hillali Y, Valeyre D, Breau JL. Assessment of malignancy in pulmonary lesions: FDG dual-head coincidence gamma camera imaging in association with serum tumor marker measurement. J Nucl Med 2000; 41:1801-7. [PMID: 11079486] [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: 02/18/2023] Open
Abstract
UNLABELLED The purpose of the study was to evaluate the performance of dual-head coincidence gamma camera imaging using FDG in association with serum marker assays in identifying lung carcinoma in patients with abnormal findings on chest radiography. METHODS A prospective evaluation of FDG imaging with coincidence detection emission tomography (CDET) using a dual-head gamma camera combined with the assessment of 3 sensitive serum markers of lung cancer (carcinoembryonic antigen, neuron specific enolase, and CYFRA 21-1) was performed on the same day on 58 consecutive patients with known or suspected lung malignancy. RESULTS Fifty-three patients were proven to have lung cancer, and 5 patients had benign lung disease. Coincidence imaging showed significantly increased FDG uptake in 49 of 53 patients with proven malignancy (sensitivity, 92.5%) and in 3 patients with benign disease. FDG imaging had negative findings in 4 patients with proven malignancy and 2 patients with benign disease. Serum tumor marker levels were elevated in 42 of 53 cancer patients (sensitivity, 79.2%) and normal in 11 patients with proven malignancy. Nine patients with proven malignancy had positive findings on FDG images and negative marker assays. Two patients with proven malignancy had negative findings on FDG images and positive marker assays. The positive predictive value for lung cancer was 94.2% for FDG alone and 97.6% for FDG in association with serum markers. CONCLUSION In this study, FDG CDET imaging was a powerful tool for evaluating patients with lung lesions suggestive of malignancy. Although the determination of serum marker levels was less accurate than FDG imaging, positive FDG results found in association with positive markers significantly increased the likelihood of lung malignancy.
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Affiliation(s)
- V Bousson
- Department of Nuclear Medicine, CHU, Paris, Bobigny, France
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24
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Furber A, Berdagué P, Cadiou C, David N, Faraggi M, Fourquet N, Hélias J, Le Guludec D, Marie PY, Ouhayoun E, Pézard P, Vanzetto G, Weinmann P. [Recommendations of the French Society of Cardiology concerning the practice of ischemia provocation tests in adult nuclear cardiology]. Arch Mal Coeur Vaiss 2000; 93:1309-32. [PMID: 11190460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Affiliation(s)
- A Furber
- Société française de cardiologie, 15, rue Cels, 75014 Paris
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25
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Weinmann P, Moretti JL. 99mTc-apcitide scintigraphy and the detection of acute deep vein thrombosis. J Nucl Med 2000; 41:1768-9. [PMID: 11038010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
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Abstract
BACKGROUND Changes induced by dipyridamole infusion on left ventricular function in healthy individuals have not been investigated by gated myocardial perfusion single photon emission computed tomographic (SPECT) imaging. METHODS AND RESULTS This study examined the amplitude and duration of changes induced by dipyridamole infusion on left ventricular function as assessed by technetium 99m sestamibi gated SPECT in 18 subjects with a low likelihood of coronary artery disease. Twenty mCi (740 MBq) of Tc-99m sestamibi were injected at rest. Three different consecutive gated SPECT images were performed 60 minutes later: baseline at rest, during the infusion of 0.76 mg/kg of dipyridamole, and 1 hour later. No patient received aminophylline. Left ventricular ejection fraction (LVEF), end-diastolic volume, and end-systolic volume were automically computed. Heart rate (HR) and blood pressure were regularly monitored. Mean LVEF was 63.2% +/- 8.0% baseline at rest, increased to 73.8% +/- 8.2% (P = .0001) during dipyridamole infusion, and returned to baseline values (63.0% +/- 7.5%) 1 hour later. End-diastolic volume did not vary significantly, and end-systolic volume decreased (from 32.2 +/- 19.5 to 26.6 +/- 17.9 u, P = .002) and returned to baseline values (32.7 +/- 15.6 u) 1 hour later. Dipyridamole induced moderate HR acceleration (from 80.2 +/- 15.0 to 96.5 +/- 9.6 beats/min, P < .001) and a slight decrease in diastolic blood pressure (from 80.6 +/- 8.1 to 70.1 +/- 9.0 mm Hg, P < .001). However, 1 hour later, HR and blood pressure had returned to baseline values. CONCLUSIONS Dipyridamole increases LVEF and HR and decreases diastolic blood pressure slightly in healthy individuals. Because dipyridamole gated SPECT imaging acquisition is usually started 60 minutes after dipyridamole infusion, LVEF is in fact estimated at rest.
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Affiliation(s)
- P Weinmann
- Department of Nuclear Medicine, Avicenne University Hospital, Bobigny, France
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Walzog B, Weinmann P, Jeblonski F, Scharffetter-Kochanek K, Bommert K, Gaehtgens P. A role for beta(2) integrins (CD11/CD18) in the regulation of cytokine gene expression of polymorphonuclear neutrophils during the inflammatory response. FASEB J 1999; 13:1855-65. [PMID: 10506590 DOI: 10.1096/fasebj.13.13.1855] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.2] [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: 11/11/2022]
Abstract
Growing evidence supports the idea that adhesion via beta(2) integrins not only allows cellular targeting, but also induces intracellular signaling, which in turn activates functional responses of adherent cells. This study investigates whether beta(2) integrin-mediated adhesion of human polymorphonuclear neutrophils (PMN) has a functional impact on cytokine production. Aggregation of the beta(2) integrin Mac-1 (CD11b/CD18) by antibody cross-linking was found to induce substantial de novo synthesis of IL-8 mRNA as measured by semiquantitative RT-PCR and Northern blotting technique, respectively. Induction of IL-8 mRNA was also observed upon adhesion of PMN to immobilized fibrinogen, a functional equivalent of its clotting product fibrin that serves as a native ligand of Mac-1. Results were confirmed using PMN derived from CD18-deficient mice, which were unable to produce MIP-2 mRNA, a homologue of human IL-8, in the presence of immobilized fibrinogen. In contrast, a substantial increase of MIP-2 mRNA was observed when wild-type PMN were incubated on immobilized fibrinogen. In human PMN, ELISA technique showed that the gene activation that required tyrosine kinase activity resulted in a substantial production and secretion of biologically active IL-8 and IL-1beta. In contrast, no TNF-alpha or IL-6 production was found, revealing that beta(2) integrins mediate differential expression of proinflammatory cytokines. The biological relevance of the present findings was confirmed in an in vivo model of acute inflammation. Altogether, the present findings provide evidence for a functional link between clotting and inflammatory responses that may contribute to the recruitment and/or activation of PMN and other cells at sites of lesion.
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Affiliation(s)
- B Walzog
- Department of Physiology, Freie Universität, D-14195 Berlin, Germany.
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29
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Abstract
It has been suggested that metoclopramide may reduce artefacts caused by intestinal activity super-imposed on myocardial uptake of MIBI SPET. This study compared the abdominal activity of MIBI in patients given metoclopramide versus a control group. Forty-seven patients with normal scintigrams or with completely normal inferior wall perfusion underwent rest 201T1 + stress MIBI testing. Twenty-four patients arbitrarily received 10 mg metoclopramide orally 45 min before the MIBI injection and 23 patients no metoclopramide. The patients were divided according to the stress performed: 23 patients had exercise and 24 patients dipyridamole infusion, and a comparison was done between patients with metoclopramide and those without. Myocardial and abdominal activity were assessed at 15 and 60 min on three separate projections and the mean myocardium-to-abdomen ratios were computed. The ratio was 1.30 +/- 0.19 and 1.57 +/- 0.23 in the patients with exercise and metoclopramide versus 1.36 +/- 0.18 and 1.64 +/- 0.23 in the patients with exercise alone at 15 and 60 min respectively. The ratio was 0.92 +/- 0.13 and 1.21 +/- 0.21 in the patients with dipyridamole infusion and metoclopramide versus 1.02 +/- 0.17 and 1.33 +/- 0.16 in the patients with dipyridamole alone at 15 and 60 min respectively. These differences were not statistically significant. In conclusion, metoclopramide has no effect on MIBI abdominal activity and is not recommended in routine practice.
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Affiliation(s)
- P Weinmann
- Servive de Médecine Nucléaire, Hôpital Avicenne, Bobigny, France
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Weinmann P, Gaehtgens P, Walzog B. Bcl-Xl- and Bax-alpha-mediated regulation of apoptosis of human neutrophils via caspase-3. Blood 1999; 93:3106-15. [PMID: 10216108] [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: 02/12/2023] Open
Abstract
In this study, a mechanism is reported which determines the lifetime of polymorphonuclear neutrophils (PMN). In human PMN freshly isolated from the circulation, expression of bcl-Xl, bax-alpha, and bak, members of the bcl-2 family of apoptosis-associated genes, was found using the reverse transcription-polymerase chain reaction technique. In contrast, no expression of bcl-2 was seen in PMN, whereas the myeloid cell line HL-60 was positive for bcl-2 mRNA. Two gene products, Bcl-Xl and Bax-alpha, which are known to function as the regulatory machinery of programmed cell death (apoptosis), were detected at the protein level in PMN. Moreover, differential expression of these proteins was found upon induction or prevention of apoptosis by cytokines: Whereas induction of apoptosis by tumor necrosis factor-alpha was associated with a reduction of expression of the anti-apoptotic Bcl-Xl protein, prevention of apoptosis by granulocyte-macrophage colony-stimulating factor led to a downregulation of expression of the death-promoting Bax-alpha protein. This shift of balance of anti- and pro-apoptotic proteins was found to control caspase-3 activity which, in turn, downregulated Bcl-Xl expression in PMN undergoing apoptosis. Thus, cytokines can affect the ratio of Bax-alpha/Bcl-Xl expression in human PMN and modulate the subsequent activity of caspase-3, which functions as executer of the programmed cell death and may promote apoptosis by a positive feed-forward mechanism that downregulates Bcl-Xl.
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Affiliation(s)
- P Weinmann
- Department of Physiology, Freie Universität, Berlin, Germany
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31
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Caglar M, Moretti JL, Buchet P, Weinmann P, Baillet G, Prigent A, Laedrich J, Le Tourmelin P, Kleinknecht D, Meyrier A. Enalapril plus frusemide MAG3 scintigraphy in hypertensive patients with atherosclerosis and moderate renal insufficiency. Nucl Med Commun 1998; 19:1135-40. [PMID: 9885803 DOI: 10.1097/00006231-199812000-00005] [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: 11/26/2022]
Abstract
We performed a retrospective study on 26 patients with moderate renal failure (mean GFR = 51 +/- 21 ml min-1 1.73 m-2), hypertension and atherosclerosis. Apart from three patients who had completely normal renal Doppler ultrasonography, all patients underwent renal angiography. Three groups of kidneys with different atherosclerotic renal artery involvement were identified: Group 1, 24 kidneys with no renal artery stenosis (RAS); Group 2, 18 kidneys with mild (> 25% and < 50% diameter) RAS; and Group 3, 10 kidneys with moderate (> 50% diameter) RAS. We used a two-day protocol with frusemide plus enalapril 99Tcm-MAG3 scintigraphy. The mean parenchymal transit time (MPTT), time to the maximum activity (time to peak) of the renal curve (Tmax), residual activity and split renal uptake were evaluated. The measured parameters did not differ before and after enalapril in Group 1 or in Group 2. In Group 3, MPTT and residual activity differed significantly (P < 0.025) before and after enalapril. The Tmax before and after enalapril, MPTT before and after enalapril and residual activity after enalapril differed significantly (P < 0.05) between Groups 1 and 3 and between Groups 2 and 3. Threshold values were obtained to maximize diagnostic accuracy. The Tmax, MPTT and residual activity after enalapril gave satisfactory results, and MPTT performed best with a 75% positive predictive value and a 98% negative predictive value for the diagnosis of renal artery stenosis. We conclude that MPTT, measured after enalapril administration, is a useful parameter to detect renal artery stenosis in patients with hypertension, atherosclerosis and moderate renal insufficiency.
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Affiliation(s)
- M Caglar
- Departement de Médecine Nucléaire, CHU Avicenne, Montreuil, France
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32
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Weinmann P, Jouan M, Nguyen QD, Lacroix B, Groiselle C, Bonte JP, Luc G. Quantitative analysis of cholesterol and cholesteryl esters in human atherosclerotic plaques using near-infrared Raman spectroscopy. Atherosclerosis 1998; 140:81-8. [PMID: 9733218 DOI: 10.1016/s0021-9150(98)00119-1] [Citation(s) in RCA: 43] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Raman spectroscopy is a non-destructive analytical technique and previous results have shown that qualitative analysis of the lipid component of human atheromatous arteries is feasible. In this paper, we describe a quantitative analytical method for cholesterol and cholesteryl esters in human atherosclerotic plaques, combined with Raman spectroscopic results, using partial least-squares (PLS) regression, a statistical multivariate method based on factorial analysis. Twenty-nine human atherosclerotic pooled samples were studied and the results of Raman spectroscopy coupled with the PLS method were compared to biochemical results. The standard error of prediction was 16.1, 13.6, 1.9, 3.3 and 3.4 mg/g for total cholesterol, free cholesterol, palmitate cholesteryl, oleate cholesteryl and linoleate cholesteryl, respectively. The repeatability of Raman spectroscopy was found to be excellent. Our results show that Raman spectroscopy is a promising technique to obtain a consistent and non-destructive quantitative analysis of cholesterol and cholesteryl esters in human atherosclerotic lesions. In situ and in vivo analysis is a possibility in the near future.
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Affiliation(s)
- P Weinmann
- Department of Biophysics and Nuclear Medicine, University Hospital Avicenne, Bobigny, France
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33
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Clarke M, Liu B, Schüller H, Binner L, Kennergren C, Guerola M, Weinmann P, Ohm OJ. Automatic adjustment of pacemaker stimulation output correlated with continuously monitored capture thresholds: a multicenter study. European Microny Study Group. Pacing Clin Electrophysiol 1998; 21:1567-75. [PMID: 9725155 DOI: 10.1111/j.1540-8159.1998.tb00244.x] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.4] [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: 11/27/2022]
Abstract
Pacing threshold is affected by many factors. A pacing system able to confirm capture at each beat and automatically adjust its output close to the actual pacing threshold is highly desirable. This study evaluates the safety and efficacy of the Autocapture function of the Pacesetter Microny SR+. One hundred thirteen patients were recruited from 16 centers in 7 European countries and followed up for 1 year. All pacemakers were implanted with Pacesetter's low polarization, bipolar leads. The key feature of Autocapture is the immediate delivery of a 4.5 V safety backup pulse 62.5 ms after any ineffective ongoing low output pulse. Holter recordings confirmed total reliability of this feature without any exit block. The measured evoked response (ER) signal was stable over time. Acute and chronic pacing thresholds measured by VARIO and Autocapture tests correlated (r > 0.79) over the period of the study. The incidence of backup pulses was 1.1% during pacing. With Autocapture programmed ON, the overall total current consumption was 4.1 microA for VVI and 5.0 microA for VVIR pacing. This study proved that the Autocapture safely and reliably regulates the pacemaker's output according to the prevailing threshold thus providing maximum patient safety and prolonging service life.
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Affiliation(s)
- M Clarke
- Department of Cardiology, City General Hospital, Stoke-on-Trent, UK
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34
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Moretti JL, Tamgac F, Weinmann P, Baillet G. Is technetium-99m-MIBI a relevant tracer to tumor response to chemotherapy of bone lesions? J Nucl Med 1998; 39:928. [PMID: 9591606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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Weinmann P, Menard G, Lacroix B, Delaigue L, Jouan M, Bonte J, Quy Dao N. 3.P.351 Determination of cholesterol content in human atherosclerotic plaques by near infrared Raman spectroscopy. Atherosclerosis 1997. [DOI: 10.1016/s0021-9150(97)89427-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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36
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Moretti JL, Baillet G, Tamgac F, Weinmann P. Role of lung retention of iodine-123 iodoamphetamine in the effect of smoking on global cerebral blood flow. Eur J Nucl Med 1997; 24:1331. [PMID: 9432469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Weinmann P, Bommert K, Mapara MY, Dörken B, Bargou RC. Overexpression of the death-promoting gene bax-alpha sensitizes human BL-41 Burkitt lymphoma cells for surface IgM-mediated apoptosis. Eur J Immunol 1997; 27:2466-8. [PMID: 9341794 DOI: 10.1002/eji.1830270947] [Citation(s) in RCA: 8] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Major regulators of programmed cell death, or apoptosis, are the members of the bcl-2 gene family. Recently, we reported that surface(s) IgM triggering of the human B lymphoma cell line BL-41 led to strong induction of bax-alpha, a death-promoting member of the bcl-2 family, and subsequently to induction of apoptosis, suggesting a potential regulatory role of bax-alpha in sIgM-mediated cell death. In contrast, apoptosis-resistant subclones of this cell line showed only weak bax-alpha expression, which was not inducible by sIgM cross-linking. In this study, we were able to demonstrate the functional significance of this observation. We stably transfected bax-alpha into a BL-41 subline resistant against sIgM-mediated apoptosis. Several bax-alpha overexpressing clones could be selected, which all showed enhanced sensitivity for sIgM-mediated apoptosis. In contrast, no sensitive clone could be identified in a large number of mock controls. This clearly indicates that induction of bax-alpha is a critical regulatory step, which sensitizes B cells for sIgM-mediated apoptosis.
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Affiliation(s)
- P Weinmann
- Max Delbrück Center for Molecular Medicine, Berlin-Buch, Germany
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Mapara MY, Weinmann P, Bommert K, Daniel PT, Bargou R, Dörken B. Involvement of NAK-1, the human nur77 homologue, in surface IgM-mediated apoptosis in Burkitt lymphoma cell line BL41. Eur J Immunol 1995; 25:2506-10. [PMID: 7589118 DOI: 10.1002/eji.1830250915] [Citation(s) in RCA: 10] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The induction of apoptosis via surface IgM (sIgM) in immature B cells requires de novo transcription. To investigate the regulation of activation-induced cell death (AICD) in B cells we used a cell line model consisting of an Epstein-Barr virus-negative Burkitt lymphoma cell line (BL41), which is highly sensitive, and a subclone which is resistant to sIgM-mediated apoptosis (BL41/B5). Resistance in this cell line was not due to down-regulation of sIgM or functional impairment in signal transduction of the surface Ig complex. The zinc finger transcription factor nur77 has been implicated to play an important role in CD3-mediated apoptosis in murine T cells. We were able to demonstrate that surface IgM ligation and subsequent apoptosis in BL41 cells is associated with a concomitant induction of NAK-1, the human nur77 homologue. Induction of NAK-1 mRNA and DNA binding activity in the nucleus could be readily observed by means of Northern blot and electrophoretic mobility shift assay, respectively. In contrast, the resistant clone BL41/B5 did not show any NAK-1 expression upon stimulation. This suggests a role for NAK-1 in sIgM-mediated apoptosis of immature B cells.
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Affiliation(s)
- M Y Mapara
- Humboldt University, Virchow Klinikum, Robert Rössle Klinik, Department of Internal Medicine (Medical Oncology and Tumorimmunology) Berlin-Buch, Germany
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Moretti JL, Caglar M, Weinmann P. Cerebral perfusion imaging tracers for SPECT: which one to choose? J Nucl Med 1995; 36:359-63. [PMID: 7884494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Affiliation(s)
- J L Moretti
- Hopital Avicenne, CHU Leonard de Vinci, Bobigny, France
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40
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Bargou RC, Bommert K, Weinmann P, Daniel PT, Wagener C, Mapara MY, Dörken B. Induction of Bax-alpha precedes apoptosis in a human B lymphoma cell line: potential role of the bcl-2 gene family in surface IgM-mediated apoptosis. Eur J Immunol 1995; 25:770-5. [PMID: 7705407 DOI: 10.1002/eji.1830250322] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [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: 01/26/2023]
Abstract
The members of the bcl-2 gene family are major regulators of programmed cell death, but their role in sIg-triggered apoptosis remains unclear. Using sensitive and resistant variants of the human B cell line BL-41, we studied the expression of the bcl-2 gene family during surface IgM-mediated apoptosis. We found constitutive Bcl-2 and Bcl-x expression, which remained unaltered after sIg cross-linking, in both resistant and sensitive cells. This and other experiments suggest that constitutive expression of Bcl-2 or Bcl-x alone is not sufficient to protect from activation-induced cell death in B cells. We therefore investigated Bax-alpha, the death-promoting splice variant of Bax, and found strong induction of both mRNA and protein upon sIg stimulation in sensitive cells. However, resistant subclones showed only weak expression, which was not inducible by sIg cross-linking. We provide evidence that up-regulation of Bax-alpha and the resulting imbalance of Bcl-2/Bax might be a major regulator of sIg-mediated apoptosis. Additionally, we found strong constitutive expression of Bcl-xs, the death promoting variant of Bcl-x, in sensitive cells, whereas resistant cells showed only weak Bcl-xs expression. Thus, we observed a much stronger expression of the death-promoting proteins Bax-alpha (inducible) and Bcl-xs (constitutive) in sensitive cells than in resistant cells. We therefore propose a potential role of the novel bcl-2 gene family members bcl-x and bax in surface IgM-triggered apoptosis.
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Affiliation(s)
- R C Bargou
- Max Delbrück Center for Molecular Medicine, Berlin-Buch, FRG
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41
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Le Guludec D, Menad F, Faraggi M, Weinmann P, Battesti JP, Valeyre D. Myocardial sarcoidosis. Clinical value of technetium-99m sestamibi tomoscintigraphy. Chest 1994; 106:1675-82. [PMID: 7988183 DOI: 10.1378/chest.106.6.1675] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.2] [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: 01/28/2023] Open
Abstract
STUDY OBJECTIVE The presence of defects on rest thallium 201 myocardial scintigraphy, reversible after dipyridamole infusion, was already demonstrated in myocardial localization of sarcoidosis. The present study compared the respective efficiency of a new tracer of myocardial blood flow, 99mTc sestamibi (sestamibi), vs thallium 201 (TI) for the diagnosis and follow-up of myocardial sarcoidosis. METHODS Quantitative single photon emission computed tomography (SPECT) was performed in 37 consecutive patients with confirmed sarcoidosis and clinical suspicion of myocardial localization. Three successive scans were performed in all patients within the same day: rest TI SPECT, rest sestamibi SPECT, and dipyridamole sestamibi SPECT. Thirteen patients were reinvestigated after 3 months of corticosteroid therapy. The size and intensity of the defects were compared using a computerized quantitative analysis of bull's eye. RESULTS At rest, sestamibi SPECT is more sensitive than TI, demonstrating significantly larger defects (28.1 +/- 13.2% vs 17.2 +/- 12.8% of bull's eye area, p < 0.001) and detecting abnormalities in seven more patients (24 vs 17). All patients with abnormal TI scans also had sestamibi abnormalities. After dipyridamole infusion, sestamibi defects decreased significantly (28.1 +/- 13.2% vs 15.2 +/- 12.3%, p < 0.001). This improvement correlated with the evolution of sestamibi SPECT performed in the 13 patients reinvestigated after corticosteroid therapy (r = 0.85, p < 0.001). CONCLUSIONS We conclude that sestamibi SPECT is suitable for the diagnosis of myocardial sarcoidosis and represents an objective tool for the follow-up. The improvement after vasodilatation supports the hypothesis of reversible abnormalities in most of these patients and accurately predicts corticosteroid efficiency.
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Affiliation(s)
- D Le Guludec
- Service of Nuclear Medicine, Bichat Hospital, Paris, France
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42
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Moretti JL, Tamgac F, Weinmann P, Caillat-Vigneron N, Belin CA, Cesaro P, Holman BL, Defer G. Early and delayed brain SPECT with technetium-99m-ECD and iodine-123-IMP in subacute strokes. J Nucl Med 1994; 35:1444-9. [PMID: 8071689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
UNLABELLED The brain distribution of 99mTc-ECD versus 123I-IMP was compared in patients with subacute stroke in order to compare diagnostic accuracy. METHODS A total of 25 patients with subacute stroke underwent early and delayed SPECT imaging with 99mTc-ECD and 123I-IMP. Washout of 99mTc-ECD was calculated and a differential percentage of activity (DPA) of ischemic versus normal zones was assessed. Images were analyzed twice by five independent observers. RESULTS Technetium-99m-ECD clearance was 12.5% from the whole brain during early imaging. Ischemic parietal zones had higher clearance than normal parietal zones. Technetium-99m-ECD images showed larger differences between abnormal and normal brain activity than 123I-IMP images. Detection accuracy was slightly, but not significantly, higher for 99mTc-ECD and 123I-IMP (sensitivity: 73.8% as 66.6%; specificity: 81.7% as 81.6%). Reproducibility among observers was similar for 99mTc-ECD and early 123I-IMP. CONCLUSION Technetium-99m-ECD demonstrates high diagnostic accuracy during subacute stroke, similar to 123I-IMP, but with more intense, better delineation of the perfusion defects.
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Affiliation(s)
- J L Moretti
- Service de Médecine Nucléaire, Hôpital Avicenne, Laboratoire de Radiopharmacologie CHU Bobigny, Créteil, France
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Weinmann P. A chimeric transactivator allows tetracycline-responsive gene expression in whole plants. Trends Genet 1994. [DOI: 10.1016/0168-9525(94)90167-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abstract
The chimeric transcriptional activator tTA, a fusion between the Tn10 encoded Tet repressor and the activation domain of the Herpes simplex virion protein VP16, was stably expressed in transgenic tobacco plants. It stimulates transcription of the beta-glucuronidase (gus) gene from an artificial promoter consisting of 7 tet operators and a TATA-box. Tetracycline, which interferes with binding of tTA to operator DNA, reduces gus expression over several orders of magnitude. This stringency of regulation suggests that the system can be used to construct transgenic plants encoding a potentially lethal gene product. Furthermore, the specific and fast inactivation of tTA allows study of the stability of RNAs and proteins.
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Affiliation(s)
- P Weinmann
- Institut für Genbiologische Forschung Berlin GmbH, Germany
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Weinmann P, Foult JM, Le Guludec D, Tamgac F, Rechtman D, Neuman A, Caillat-Vigneron N, Moretti JL. Dual-isotope myocardial imaging: feasibility, advantages and limitations. Preliminary report on 231 consecutive patients. Eur J Nucl Med 1994; 21:212-5. [PMID: 8200388 DOI: 10.1007/bf00188668] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Two hundred and thirty-one patients underwent dual-isotope myocardial imaging (rest thallium-201 followed by stress technetium-99m sestamibi). The feasibility of the procedure was excellent: camera scheduling flexibility was improved and the duration of the procedure was less than that of a classical stress-redistribution procedure. Interpretation of defects due to image attenuation was facilitated by the different attenuation properties of 201Tl and 99mTc-sestamibi in 11 of 19 patients. 201Tl cross-over on 99mTc was found to be 15% +/- 3% with doses of 201Tl and 99mTc-sestamibi of 3 and 10 mCi, respectively, and 7% +/- 2% with doses of 3 and 20 mCi. This protocol should preferentially be reserved for patients with a history of myocardial infarction and/or a basal left ventricular dysfunction, in whom assessment of myocardial viability is of major interest. Extensive clinical validation of the dual-isotope procedure is required and optimal acquisition and reconstruction parameters should be established.
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Affiliation(s)
- P Weinmann
- Department of Nuclear Medicine, Avicenne University Hospital, Bobigny, France
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Tamgac F, Moretti JL, Defer G, Weinmann P, Roussi A, Cesaro P. Non-matched images with 123I-IMP and 99mTc-bicisate single-photon emission tomography in the demonstration of focal hyperaemia during the subacute phase of an ischaemic stroke. Eur J Nucl Med 1994; 21:254-7. [PMID: 8200394 DOI: 10.1007/bf00188674] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Focal hyperaemia is a fairly common phenomenon in the subacute phase of an ischaemic stroke. This has rarely been reported with iodine-123 iodoamphetamine (IMP) and has never been identified using technetium-99m bicisate (99mTc-ECD). In this report, we present the case of a patient suffering from a left cerebral posterior stroke. 123I-IMP single-photon emission tomography (SPET) images showed a large area of significantly increased IMP activity located in the left occipital region whereas 99mTc-bicisate SPET displayed hypoactivity in the same area.
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Affiliation(s)
- F Tamgac
- Service de Médecine et de Neurologie Nucléaire, Hôpital Avicenne, Laboratoire de Radiopharmacologie CHU Bobigny, France
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48
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Moretti JL, Defer G, Tamgac F, Weinmann P, Belin C, Cesaro P. Comparison of brain SPECT using 99mTc-bicisate (L,L-ECD) and [123I]IMP in cortical and subcortical strokes. J Cereb Blood Flow Metab 1994; 14 Suppl 1:S84-90. [PMID: 8263076] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Single photon emission computed tomography (SPECT) using 99mTc-bicisate and N-isopropyl-p-[123I]iodoamphetamine ([123I]IMP) was compared in 25 patients suffering cerebral ischemia during the subacute phase (7-14 days) of stroke. Patients were classified as cortical strokes (15) and subcortical strokes (10) according to clinical and CT data. Images were analyzed by five independent blinded observers. Then, using a cross-matching method between normal and abnormal brain areas, we evaluated the sensitivity and specificity for 99mTc-bicisate and [123I]IMP and inter- and intraobserver reproducibility. A semiquantitative analysis was performed to compare abnormal hypoactive areas versus the corresponding contralateral areas for 99mTc-bicisate and [123I]IMP in the two patient groups. There was no significant difference for sensitivity and specificity between 99mTc-bicisate and [123I]IMP. Matching was approximately 90% in the two groups. The kappa-concordance index was satisfactory and slightly better for 99mTc-bicisate (0.485) than for [123I]IMP (0.435). Level of hypoactivity in the abnormal areas was significantly higher for 99mTc-bicisate (p < 0.03, n = 25) than for [123I]IMP, especially for cortical strokes. This comparative study demonstrates that 99mTc-bicisate is a very useful tracer for the detection of focal cerebral ischemia by SPECT during the subacute phase of stroke.
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Affiliation(s)
- J L Moretti
- Service de Médecine Nucléaire, CHU, Avicenne, Bobigny, France
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Abstract
A 59-year-old male underwent a dipyridamole myocardial scintigraphy. During dipyridamole infusion, a marked ST-segment elevation was observed in the inferior leads. After aminophylline injection, a short burst of ventricular tachycardia occurred, then the ST-segment elevation disappeared. The myocardial scintigraphy was consistent with myocardial ischemia of the inferior wall. The coronary angiography revealed no significant coronary lesion. Coronary spasm induced by dipyridamole remained the most probable mechanism for this complication.
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Affiliation(s)
- P Weinmann
- Service de Biophysique et Médecine Nucléaire, Hôpital Avicenne, Bobigny, France
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Tamgac F, Moretti JL, Rocchisani JM, Baillet G, Weinmann P. 99mTc-MAG3 and 99mTc-DMSA in the detection and assessment of pyelonephritis. J Nucl Biol Med (1991) 1993; 37:62-64. [PMID: 8396978] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
In this report, we present the case of a patient suffering from recurrent acute pyelonephritis and who had a hypertrophic right kidney following left nephrectomy. 99mTc-dimercaptosuccinic acid (DMSA) scan is known to be of value in the diagnosis of pyelonephritis, based on the detection of parenchymal abnormalities. The kidney accumulation of 99mTc-mercaptoacetyl-glycylglycylglycine (MAG3) at 2-3 minutes also proves to supply useful information on cortical function. This case illustrates that 99mTc-MAG3 study may be an efficient complementary examination to 99mTc-DMSA scan in the detection and assessment of pyelonephritis.
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Affiliation(s)
- F Tamgac
- Service de Médecine Nucléaire, Hôpital Avicenne, Bobigny, France
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