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Sun H, Cai H, Xu C, Zhai H, Lux F, Xie Y, Feng L, Du L, Liu Y, Sun X, Wang Q, Song H, He N, Zhang M, Ji K, Wang J, Gu Y, Leduc G, Doussineau T, Wang Y, Liu Q, Tillement O. AGuIX nanoparticles enhance ionizing radiation-induced ferroptosis on tumor cells by targeting the NRF2-GPX4 signaling pathway. J Nanobiotechnology 2022; 20:449. [PMID: 36242003 PMCID: PMC9569109 DOI: 10.1186/s12951-022-01654-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [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: 06/09/2022] [Accepted: 09/25/2022] [Indexed: 11/10/2022] Open
Abstract
In the frame of radiotherapy treatment of cancer, radioresistance remains a major issue that still needs solutions to be overcome. To effectively improve the radiosensitivity of tumors and reduce the damage of radiation to neighboring normal tissues, radiosensitizers have been given increasing attention in recent years. As nanoparticles based on the metal element gadolinium, AGuIX nanoparticles have been shown to increase the radiosensitivity of cancers. Although it is a rare nanomaterial that has entered preclinical trials, the unclear biological mechanism hinders its further clinical application. In this study, we demonstrated the effectiveness of AGuIX nanoparticles in the radiosensitization of triple-negative breast cancer. We found that AGuIX nanoparticles increased the level of DNA damage by compromising the homologous recombination repair pathway instead of the non-homologous end joining pathway. Moreover, the results showed that AGuIX nanoparticles induced apoptosis, but the degree of apoptosis ability was very low, which cannot fully explain their strong radiosensitizing effect. Ferroptosis, the other mode of cell death, was also discovered to play a significant role in radiation sensitization, and AGuIX nanoparticles may regulate the anti-ferroptosis system by inhibiting the NRF2-GSH-GPX4 signaling pathway.
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Affiliation(s)
- Hao Sun
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Hui Cai
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Chang Xu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Hezheng Zhai
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China.,School of Precision Instruments and OPTO-Electronics Engineering, Tianjin University, Tianjin, 300072, China
| | - François Lux
- Institute Light and Mater, UMR5306, Lyon1 University-CNRS, Lyon University, 69100, Villeurbanne, France.,Institut Universitaire de France (IUF), 75231, Paris, France
| | - Yi Xie
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
| | - Li Feng
- Department of Medical Ultrasound, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Abdominal Medical Imaging, Jinan, 250014, China
| | - Liqing Du
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Yang Liu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Xiaohui Sun
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Qin Wang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Huijuan Song
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Ningning He
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Manman Zhang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Kaihua Ji
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Jinhan Wang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Yeqing Gu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China
| | - Géraldine Leduc
- NH TherAguix S.A.S, 29 chemin du Vieux Chêne, 38240, Meylan, France
| | | | - Yan Wang
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China.
| | - Qiang Liu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China.
| | - Olivier Tillement
- Institute Light and Mater, UMR5306, Lyon1 University-CNRS, Lyon University, 69100, Villeurbanne, France
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Du Y, Sun H, Lux F, Xie Y, Du L, Xu C, Zhang H, He N, Wang J, Liu Y, Leduc G, Doussineau T, Ji K, Wang Q, Lin Z, Wang Y, Liu Q, Tillement O. Radiosensitization Effect of AGuIX, a Gadolinium-Based Nanoparticle, in Nonsmall Cell Lung Cancer. ACS Appl Mater Interfaces 2020; 12:56874-56885. [PMID: 33326207 DOI: 10.1021/acsami.0c16548] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Radiotherapy is the main treatment for cancer patients. A major concern in radiotherapy is the radiation resistance of some tumors, such as human nonsmall cell lung cancer. However, the radiation dose delivered to the tumors is often limited by the possibility of collateral damage to surrounding healthy tissues. A new and efficient gadolinium-based nanoparticle, AGuIX, has recently been developed for magnetic resonance imaging-guided radiotherapy and has been proven to act as an efficient radiosensitizer. The amplified radiation effects of AGuIX nanoparticles appear to be due to the emission of low-energy photoelectrons and Auger electron interactions. We demonstrated that AGuIX nanoparticles exacerbated radiation-induced DNA double-strand break damage and reduced DNA repair in the H1299 nonsmall cell lung cancer cell line. Furthermore, we observed a significant improvement in tumor cell damage and growth suppression, under radiation therapy, with the AGuIX nanoparticles in a H1299 mouse xenograft model. This study paves the way for research into the radiosensitization mechanism of AGuIX nanoparticles and provides a scientific basis for the use of AGuIX nanoparticles as radiosensitizing drugs.
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Affiliation(s)
- Yanan Du
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
- Tianjin Center for Disease Control and Prevention, 300011 Tianjin, China
| | - Hao Sun
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | - François Lux
- Institute Light and Mater, UMR5306, Lyon1 University-CNRS, Lyon University, 69100 Villeurbanne, France
- NH TherAguix, NH TherAguix SAS, 69100 Villeurbanne, France
| | - Yi Xie
- Institute of Modern Physics, Chinese Academy of Sciences, 730000 Lanzhou, China
| | - Liqing Du
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | - Chang Xu
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | - Hong Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, 730000 Lanzhou, China
| | - Ningning He
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | - Jinhan Wang
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | - Yang Liu
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | | | | | - Kaihua Ji
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | - Qin Wang
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | - Zhenhua Lin
- NH TherAguix, NH TherAguix SAS, 69100 Villeurbanne, France
| | - Yan Wang
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | - Qiang Liu
- Institute of Radiation Medicine& Peking Union Medical College, Chinese Academy of Medical Sciences, 300192 Tianjin, China
| | - Olivier Tillement
- Institute Light and Mater, UMR5306, Lyon1 University-CNRS, Lyon University, 69100 Villeurbanne, France
- NH TherAguix, NH TherAguix SAS, 69100 Villeurbanne, France
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3
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Natali F, Dolce C, Peters J, Stelletta C, Demé B, Ollivier J, Leduc G, Cupane A, Barbier EL. Brain lateralization probed by water diffusion at the atomic to micrometric scale. Sci Rep 2019; 9:14694. [PMID: 31604980 PMCID: PMC6789030 DOI: 10.1038/s41598-019-51022-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 09/23/2019] [Indexed: 01/27/2023] Open
Abstract
Combined neutron scattering and diffusion nuclear magnetic resonance experiments have been used to reveal significant interregional asymmetries (lateralization) in bovine brain hemispheres in terms of myelin arrangement and water dynamics at micron to atomic scales. Thicker myelin sheaths were found in the left hemisphere using neutron diffraction. 4.7 T dMRI and quasi-elastic neutron experiments highlighted significant differences in the properties of water dynamics in the two hemispheres. The results were interpreted in terms of hemisphere-dependent cellular composition (number of neurons, cell distribution, etc.) as well as specificity of neurological functions (such as preferential networking).
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Affiliation(s)
- F Natali
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042, Grenoble cedex 9, France.
- CNR-IOM, OGG, 71 avenue des Martyrs, CS 20156, 38042, Grenoble cedex 9, France.
| | - C Dolce
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042, Grenoble cedex 9, France
- University Grenoble Alpes, LiPhy, 140 rue de la physique, 38402, Saint Martin d'Hères, France
- Department of Physics and Chemistry, University of Palermo, via Archirafi 36, 90123, Palermo, Italy
| | - J Peters
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042, Grenoble cedex 9, France
- University Grenoble Alpes, LiPhy, 140 rue de la physique, 38402, Saint Martin d'Hères, France
| | - C Stelletta
- Department of Animal Med., Production and Health, University of Padova, Viale dell'Università 16, 35020, Agripolis, Legnaro, Italy
| | - B Demé
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042, Grenoble cedex 9, France
| | - J Ollivier
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042, Grenoble cedex 9, France
| | - G Leduc
- Biomedical Facility, ESRF, 71 avenue des Martyrs, CS 20156, 38042, Grenoble cedex 9, France
| | - A Cupane
- Department of Physics and Chemistry, University of Palermo, via Archirafi 36, 90123, Palermo, Italy
| | - E L Barbier
- University Grenoble Alpes, Inserm, U1216, Grenoble Institut Neurosciences, 38000, Grenoble, France
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Leduc G, Bawin M, Kesteman M, Mutijima E, Maes N, Coimbra C, Delvenne P, Somja J. [Influence of clinical and pathological factors on lymph node harvesting in surgical specimens of colorectal cancer]. Rev Med Liege 2019; 74:535-542. [PMID: 31609557] [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] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In colorectal cancer staging, pathologic lymph node analysis is a crucial information for the clinician and must be performed with a maximal level of accuracy. Therefore, the surgical sample analysis needs harvesting of as many lymph nodes as possible from the mesentery. In this study, we analysed the influence of a series of clinical and pathological factors which could influence lymph node harvesting. A total of 239 patients were included in our study. The factors with a statistically significant influence on lymph node collection (pinferior to0.05) were the age, gender of the patient, size of the primitive neoplasm, size of the surgical specimen, expertise of the surgeon and the pathology department. The presence of a radiochimiotherapy did not have any influence on the lymph node collection. This study highlights the importance of lymph node harvesting in colorectal surgical specimens of colo-rectal cancers.
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Affiliation(s)
- G Leduc
- Service de Médecine générale, Liège Université, Belgique
| | - M Bawin
- Service de Chirurgie orthopédique, CHC Liège, Belgique
| | - M Kesteman
- Service d'Anatomie pathologique, CHU Liège, Belgique
| | - E Mutijima
- Service d'Anatomie pathologique, CHU Liège, Belgique
| | - N Maes
- Service des informations médico-économiques, secteur «Appui à la Recherche Clinique et Biostatistique», CHU Liège, Belgique
| | - C Coimbra
- Service de Chirurgie abdominale, CHU Liège, Belgique
| | - P Delvenne
- Service d'Anatomie pathologique, CHU Liège, Belgique
| | - J Somja
- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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5
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Natali F, Dolce C, Peters J, Stelletta C, Demé B, Ollivier J, Boehm M, Leduc G, Piazza I, Cupane A, Barbier EL. Anomalous water dynamics in brain: a combined diffusion magnetic resonance imaging and neutron scattering investigation. J R Soc Interface 2019; 16:20190186. [PMID: 31409238 DOI: 10.1098/rsif.2019.0186] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Water diffusion is an optimal tool for investigating the architecture of brain tissue on which modern medical diagnostic imaging techniques rely. However, intrinsic tissue heterogeneity causes systematic deviations from pure free-water diffusion behaviour. To date, numerous theoretical and empirical approaches have been proposed to explain the non-Gaussian profile of this process. The aim of this work is to shed light on the physics piloting water diffusion in brain tissue at the micrometre-to-atomic scale. Combined diffusion magnetic resonance imaging and first pioneering neutron scattering experiments on bovine brain tissue have been performed in order to probe diffusion distances up to macromolecular separation. The coexistence of free-like and confined water populations in brain tissue extracted from a bovine right hemisphere has been revealed at the micrometre and atomic scale. The results are relevant for improving the modelling of the physics driving intra- and extracellular water diffusion in brain, with evident benefit for the diffusion magnetic resonance imaging technique, nowadays widely used to diagnose, at the micrometre scale, brain diseases such as ischemia and tumours.
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Affiliation(s)
- F Natali
- Institut Laue-Langevin, Grenoble Cedex 9, France.,CNR-IOM, OGG, Grenoble Cedex 9, France
| | - C Dolce
- Institut Laue-Langevin, Grenoble Cedex 9, France.,CNRS, Univ. Grenoble Alpes, LIPhy, 38000 Grenoble, France.,Department of Physics and Chemistry, University of Palermo, Palermo, Italy
| | - J Peters
- Institut Laue-Langevin, Grenoble Cedex 9, France.,CNRS, Univ. Grenoble Alpes, LIPhy, 38000 Grenoble, France
| | - C Stelletta
- Department of Animal Medicine, Production and Health, University of Padova, Padova, Italy
| | - B Demé
- Institut Laue-Langevin, Grenoble Cedex 9, France
| | - J Ollivier
- Institut Laue-Langevin, Grenoble Cedex 9, France
| | - M Boehm
- Institut Laue-Langevin, Grenoble Cedex 9, France
| | - G Leduc
- Biomedical Facility, ESRF, Grenoble, France
| | - I Piazza
- Institut Laue-Langevin, Grenoble Cedex 9, France.,Department of Physics and Chemistry, University of Palermo, Palermo, Italy
| | - A Cupane
- Department of Physics and Chemistry, University of Palermo, Palermo, Italy
| | - E L Barbier
- Grenoble Institut Neurosciences, University of Grenoble Alpes, Inserm, U1216, 38000 Grenoble, France
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Wyndels K, Haeghebaert S, Leduc G, Caron A, Chaud P, Merlin B, Elmouden M, Battist F, Janssens M. COL 8-01 - Surveillance sanitaire des populations migrantes à Calais et Grande-Synthe. Med Mal Infect 2016. [DOI: 10.1016/s0399-077x(16)30291-8] [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: 10/21/2022]
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Borghese MM, Tremblay MS, LeBlanc AG, Leduc G, Boyer C, Chaput JP. Comparison of ActiGraph GT3X+ and Actical accelerometer data in 9-11-year-old Canadian children. J Sports Sci 2016; 35:517-524. [PMID: 27103499 DOI: 10.1080/02640414.2016.1175653] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Accelerometry is the gold standard for field-based physical activity assessment in children; however, the plethora of devices, data reduction procedures, and cut-points available limits comparability between studies. This study aimed to compare physical activity variables from the ActiGraph GT3X+ and Actical accelerometers in children under free-living conditions. A cross-sectional study of 379 children aged 9-11 years from Ottawa (Canada) was conducted. Children wore the ActiGraph GT3X+ and Actical accelerometers on the hip simultaneously for 7 consecutive days (24-h protocol). Moderate-to-vigorous (MVPA), vigorous (VPA), moderate (MPA), and light (LPA) physical activity, as well as sedentary time, (SED) were derived using established data reduction protocols. Excellent agreement between devices was observed for MVPA (ICC = 0.73-0.80), with fair to good agreement for MPA, LPA and SED, and poor agreement for VPA. Bland-Altman plots showed excellent agreement for MVPA, LPA, and SED, adequate agreement for MPA, and poor agreement for VPA. MVPA derived from the Actical was 11.7% lower than the ActiGraph GT3X+. The ActiGraph GT3X+ and Actical are comparable for measuring children's MVPA. However, comparison between devices for VPA, MPA, LPA, and SED are highly dependent on data reduction procedures and cut-points, and should be interpreted with caution.
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Affiliation(s)
- M M Borghese
- a School of Kinesiology and Health Studies , Queen's University , Kingston , ON , Canada
| | - M S Tremblay
- b Healthy Active Living and Obesity Research Group , Children's Hospital of Eastern Ontario Research Institute , Ottawa , ON , Canada.,c School of Human Kinetics, Faculty of Health Sciences , University of Ottawa , Ottawa , ON , Canada.,d Department of Pediatrics, Faculty of Medicine , University of Ottawa , Ottawa , ON , Canada
| | - A G LeBlanc
- b Healthy Active Living and Obesity Research Group , Children's Hospital of Eastern Ontario Research Institute , Ottawa , ON , Canada
| | - G Leduc
- b Healthy Active Living and Obesity Research Group , Children's Hospital of Eastern Ontario Research Institute , Ottawa , ON , Canada
| | - C Boyer
- b Healthy Active Living and Obesity Research Group , Children's Hospital of Eastern Ontario Research Institute , Ottawa , ON , Canada
| | - J P Chaput
- b Healthy Active Living and Obesity Research Group , Children's Hospital of Eastern Ontario Research Institute , Ottawa , ON , Canada.,c School of Human Kinetics, Faculty of Health Sciences , University of Ottawa , Ottawa , ON , Canada.,d Department of Pediatrics, Faculty of Medicine , University of Ottawa , Ottawa , ON , Canada
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Leblanc A, Tremblay M, Boyer C, Borghese M, Leduc G, Chaput J. Associations between sleep characteristics and dietary intake patterns in 10-year old Canadian children. Sleep Med 2015. [DOI: 10.1016/j.sleep.2015.02.1411] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bouchet A, Lemasson B, Christen T, Potez M, Rome C, Coquery N, Le Clec'h C, Moisan A, Bräuer-Krisch E, Leduc G, Rémy C, Laissue JA, Barbier EL, Brun E, Serduc R. Synchrotron microbeam radiation therapy induces hypoxia in intracerebral gliosarcoma but not in the normal brain. Radiother Oncol 2013; 108:143-8. [PMID: 23731617 DOI: 10.1016/j.radonc.2013.05.013] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [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: 01/22/2013] [Revised: 04/12/2013] [Accepted: 05/04/2013] [Indexed: 10/26/2022]
Abstract
PURPOSE Synchrotron microbeam radiation therapy (MRT) is an innovative irradiation modality based on spatial fractionation of a high-dose X-ray beam into lattices of microbeams. The increase in lifespan of brain tumor-bearing rats is associated with vascular damage but the physiological consequences of MRT on blood vessels have not been described. In this manuscript, we evaluate the oxygenation changes induced by MRT in an intracerebral 9L gliosarcoma model. METHODS Tissue responses to MRT (two orthogonal arrays (2 × 400Gy)) were studied using magnetic resonance-based measurements of local blood oxygen saturation (MR_SO2) and quantitative immunohistology of RECA-1, Type-IV collagen and GLUT-1, marker of hypoxia. RESULTS In tumors, MR_SO2 decreased by a factor of 2 in tumor between day 8 and day 45 after MRT. This correlated with tumor vascular remodeling, i.e. decrease in vessel density, increases in half-vessel distances (×5) and GLUT-1 immunoreactivity. Conversely, MRT did not change normal brain MR_SO2, although vessel inter-distances increased slightly. CONCLUSION We provide new evidence for the differential effect of MRT on tumor vasculature, an effect that leads to tumor hypoxia. As hypothesized formerly, the vasculature of the normal brain exposed to MRT remains sufficiently perfused to prevent any hypoxia.
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Blanchet C, Giguère Y, Prud'homme D, Turcot-Lemay L, Dumont M, Leduc G, Côte S, Laflamme N, Rousseau F, Dodin S. Leisure physical activity is associated with quantitative ultrasound measurements independently of bone mineral density in postmenopausal women. Calcif Tissue Int 2003; 73:339-49. [PMID: 12874703 DOI: 10.1007/s00223-002-1091-9] [Citation(s) in RCA: 36] [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] [Received: 09/27/2003] [Accepted: 02/12/2003] [Indexed: 11/26/2022]
Abstract
The purpose of this study was to assess the magnitude of the relationship between leisure physical activity and bone status as measured either by an Achilles ultrasound bone densitometer (QUS) or dual-energy X-ray absorptiometry (DXA) in postmenopausal women. We studied 1162 French Canadian postmenopausal women, aged 33-84 years (mean age 58 years), for QUS parameters [broadband ultrasound attenuation (BUA), speed of sound (SOS), and stiffness index (SI)] measured at the right calcaneus, and bone mineral density (BMD) measured at the lumbar spine and femoral neck. Multivariate regression analyses revealed that leisure physical activity level was an independent predictor of the heel QUS parameters and of femoral neck BMD. No such association was observed for BMD of the lumbar spine. Heel QUS parameters (BUA, SOS, SI) and femoral neck BMD adjusted for interfering covariables showed a statistically significant difference between sedentary (less than three sessions/month) and active women (three or more sessions/week) (P < or = 0.001). Furthermore, after adjusting each heel QUS parameters for the mean lumbar spine BMD value, the association observed between leisure physical activity and QUS remained significant. These results suggest that regular leisure physical activity could influence QUS parameters, independently of BMD, and that quantitative ultrasound could be a suitable outcome measure in exercise studies in postmenopausal women.
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Affiliation(s)
- C Blanchet
- Unité de recherche en endocrinologie de la reproduction, Hôpital St-François D'Assise, CHUQ, Québec, Canada
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11
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Sankoff D, Leduc G, Antoine N, Paquin B, Lang BF, Cedergren R. Gene order comparisons for phylogenetic inference: evolution of the mitochondrial genome. Proc Natl Acad Sci U S A 1992; 89:6575-9. [PMID: 1631158 PMCID: PMC49544 DOI: 10.1073/pnas.89.14.6575] [Citation(s) in RCA: 275] [Impact Index Per Article: 8.6] [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: 12/28/2022] Open
Abstract
Detailed knowledge of gene maps or even complete nucleotide sequences for small genomes leads to the feasibility of evolutionary inference based on the macrostructure of entire genomes, rather than on the traditional comparison of homologous versions of a single gene in different organisms. The mathematical modeling of evolution at the genomic level, however, and the associated inferential apparatus are qualitatively different from the usual sequence comparison theory developed to study evolution at the level of individual gene sequences. We describe the construction of a database of 16 mitochondrial gene orders from fungi and other eukaryotes by using complete or nearly complete genomic sequences; propose a measure of gene order rearrangement based on the minimal set of chromosomal inversions, transpositions, insertions, and deletions necessary to convert the order in one genome to that of the other; report on algorithm design and the development of the DERANGE software for the calculation of this measure; and present the results of analyzing the mitochondrial data with the aid of this tool.
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Affiliation(s)
- D Sankoff
- Centre de recherches mathématiques, Université de Montréal, Canada
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12
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Bielmann P, Leduc G, Thibault G, Lepage J, Davignon J. Effects of chlorthalidone and metoprolol alone or in combination (logroton) on blood pressure, lipids, lipoproteins and circulating plasma ANF levels in essential hypertension. Int J Clin Pharmacol Ther Toxicol 1991; 29:479-85. [PMID: 1839902] [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: 12/29/2022]
Abstract
The effects of chlorthalidone (mean dose 25 mg/day), metoprolol (mean dose 200 mg/day) or their combination (logroton) on blood pressure, lipids, lipoproteins and circulating atrial natriuretic factor (ANF) were evaluated in a controlled trial of 42-week duration in 33 hypertensive patients. There was a significant reduction in mean arterial pressure after chlorthalidone and metoprolol treatments. This effect was more pronounced with the chlorthalidone/metoprolol combination (logroton). There were no significant changes in mean ANF levels after any drug regimen, although a tendency to increase was observed after six weeks of treatment with metoprolol. Both chlorthalidone and metoprolol as monotherapy increased the total triglycerides. This effect was less pronounced with logroton. During metoprolol treatment, HDL cholesterol decreased significantly, whereas VLDL-C increased. When combined drug therapy was administered, the unfavorable effects on HDL-C were partially blunted and VLDL-C returned to baseline. LDL-cholesterol did not change significantly during any drug regimen nor did the ratio of LDL-C/HDL-C. Logroton significantly increased the VLDL apo B levels in patients who had received chlorthalidone as monotherapy but had no effect in patients already treated with metoprolol. Neither treatment had a significant influence on the ratio of LDL-C/B. There were no serious adverse events reported throughout the study. It is concluded that logroton may be an effective combination therapy that produces less adverse effects on lipid and lipoprotein metabolism than chlorthalidone or metoprolol monotherapies.
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Affiliation(s)
- P Bielmann
- Clinical Research Institute of Montreal, Canada
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Bielmann P, Leduc G, Gutkowska J, Davignon J. Effects of ketanserin on lipids, lipoproteins, and plasma atrial natriuretic factor in patients with essential hypertension. J Clin Pharmacol 1990; 30:438-43. [PMID: 2140838 DOI: 10.1002/j.1552-4604.1990.tb03482.x] [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: 12/30/2022]
Abstract
The effects of ketanserin, 40 mg/day (KE40) and 80 mg/day (KE80) on mean arterial pressure, lipids, lipoproteins, and circulating atrial natriuretic factor (ANF) were investigated in a 24-week controlled study in 29 patients suffering from mild to moderate hypertension. A significant decrease in mean arterial pressure (MAP) was observed after 18 weeks of therapy, accompanied by a 64% (P less than .05) and 80% (P less than .02) increase in circulating ANF levels with KE40 and KE80, respectively. There were no significant changes in mean total cholesterol, triglycerides, or cholesterol of the high density lipoproteins (HDL), low density lipoproteins (LDL), and very low density lipoproteins (VLDL) fractions. There was a significant increase in the mean apo B levels and consequently a slight but statistically significant decrease in the ratio of LDL C/B. It is concluded that both doses of KE are effective for monotherapy of mild to moderate essential hypertension. The drug sharply increases circulating ANF levels without significantly altering the plasma lipids. In contrast, by increasing the apolipoprotein B content of the LDL fraction, the beneficial cardiovascular effect of a lowered blood pressure may be partly blunted.
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Affiliation(s)
- P Bielmann
- Clinical Research Institute of Montreal, Canada, Quebec
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14
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Leduc G. [Necessity of an ethics committee in a research center]. Union Med Can 1982; 111:255-6. [PMID: 7080273] [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: 01/23/2023]
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15
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Dixon DG, Leduc G. Chronic cyanide poisoning of rainbow trout and its effects on growth, respiration, and liver histopathology. Arch Environ Contam Toxicol 1981; 10:117-131. [PMID: 6263193 DOI: 10.1007/bf01057580] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Cyanide markedly affected growth and resting metabolic rate while causing degenerative hepatic necrosis in juvenile rainbow trout (Salmo gairdneri, Richardson). This was revealed during two experiments performed in continuously renewed water at 12.5 degree C with fish fed a restricted artificial diet and exposed to assayed cyanide concentrations of 0.00, 0.01, 0.02, or 0.03 mg/L hydrogen cyanide (HCN) for 18 days. At 0.02 and 0.03 mg/L, HCN growth was reduced by 40 to 95% after 18 days. At all concentrations, cyanide caused a severe initial repression of specific growth rate, followed by a highly significant increase which was insufficient to compensate for the original repression. Previous exposure to cyanide promoted a higher resting metabolic rate during the six days following exposure, the effect increasing with cyanide concentration. At all concentrations tested, widespread cyanide-induced degenerative necrosis of hepatocytes was observed; it was more intense at higher cyanide concentrations and well established even at 0.01 mg/L HCN.
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16
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Bielmann P, Leduc G, Davignon J. [Selective beta blockaders (metoprolol) versus non selective (propranolol): comparative effects on the composition of lipoprotein fractions and on blood pressure]. Union Med Can 1980; 109:1734-40. [PMID: 7210316] [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: 01/24/2023]
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17
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Bielmann P, Leduc G. Effects of metoprolol and propranolol on lipid metabolism. Int J Clin Pharmacol Biopharm 1979; 17:378-82. [PMID: 500259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Treatment of five hypertriglyceridemic and one normolipemic patients with propranolol, a non-selective beta-blocking agent, and metoprolol, which is generally considered to be a cardioselective beta-adrenoceptor antagonist, was observed to produce a further elevation in their triglyceride levels. The subjects were followed for 20 weeks, during which they received propranolol for eight weeks, a placebo for four weeks and metoprolol for eight weeks in a crossover design. The analysis suggested that the increase in triglyceride levels was less pronounced with the more cardioselective agent. Moreover, alpha-cholesterol decreased significantly after propranolol but remained constant while on metoprolol. Both drugs decreased beta-cholesterol whereas chylo- and pre- beta-cholesterol increased, particularly with propranolol. Considering the contradictory evidence regarding the clinical importance of chronic elevation of plasma triglyceride and decreased alpha- und beta-cholesterol concentrations, it is suggested that a cardioselective drug would be presently preferable in hyperlipidemic subjects.
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Fournier C, Gay J, Benoit P, Maouad J, Mechmeche R, Saudemont JP, Leduc G, Gerbaux A. [Anomaly of the starting point of the left coronary artery from the trunk of the pulmonary artery. A study of three cases of the "adult" type (author's transl)]. Ann Cardiol Angeiol (Paris) 1979; 28:89-94. [PMID: 453772] [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: 12/15/2022]
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20
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d'Allaines C, Marchand M, Gay J, Leduc G, Farge C, Dubost C. [Recurrence of a myxoma in the left atrium. With reference to a successful operation (author's transl)]. Ann Chir Thorac Cardiovasc 1976; 15:99-104. [PMID: 1275429] [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: 12/26/2022]
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21
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Valty J, Leduc G, Ruiz E, Heulin A, Bouchard F, Joly H, Camillieri J, Guerinon M, Caramanian M, Clément M, Voise P, Maurice P. [Study of interventricular septal defects with equal aortic and pulmonary artery pressures. Classification by clinical and computer methods of 70 cases]. Arch Mal Coeur Vaiss 1975; 68:253-64. [PMID: 814862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Application of various methods of classification to a group of 70 cases of ventricular septal defect with high pulmonary artery hypertension allowed a comparative study between the various methods aiming at distinguishing the forms with low from high pulmonary artery resistance. The reference clinical classification provides supplementary informations derived from the natural or post-operative course and eventually from the microscopic examination. The first automatic classification relies on the study of a single criterion: the pulmonary arteriolar resistance and the systemic resistance ratio. A second classification is based on the attribution of points to some clinical or haemodynamic signs resulting in a score orienting the classification of every individual. Multifactorial analysis methods deal with all the available informations for the overall group, and suppose the use of a computer. The informatic methods make it possible to study the classifying value of every sign. Correlations were established between these various techniques and the medical classification.
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Genest J, Kuchel O, Leduc G, Granger P, Boucher R, Rojo-Ortega JM, Nowaczynski W. Screening programs for hypertension. Can Med Assoc J 1974; 111:147-9. [PMID: 4841837 PMCID: PMC1947612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
MAJOR SCREENING PROGRAMS FOR HYPERTENSION ARE NECESSARY FOR THE FOLLOWING REASONS: (a) the 12 to 15% prevalence of hypertension in the North American population; (b) the high proportion of hypertensive patients who are inadequately treated or whose disease is not even recognized; (c) the fact that in too many medical centres hypertension is poorly investigated or considered an insignificant finding; (d) the demonstration by many groups, especially the Framingham study, of hypertension as the major factor in the occurrence of severe cardiovascular disease; and (e) the achievement of a marked decrease in severe cardiovascular complications following adequate treatment. But such screening programs are of little value if unaccompanied by a major educational effort directed not only to the public but also to the medical profession, and a parallel increase in the funding of biomedical research into the basic physiopathological mechanisms of hypertension.
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23
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Kuchel O, Leduc G, Genest J. [New concepts on the pathogenesis and treatment of essential arterial hypertension]. Union Med Can 1973; 102:770-4. [PMID: 4733009] [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: 01/12/2023]
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24
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Bregeon PC, Renier J, Fonty P, Leduc G, Mollaret H. Une observation de polyarthrite sévère en rapport avec une infection par Yersinia enterocolitica. Med Mal Infect 1973. [DOI: 10.1016/s0399-077x(73)80073-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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25
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Fouchard J, Caramanian M, Cabrol C, Fcoiffier J, Leduc G, Rasolomampionona M. [Myocardial infarct with normal coronarography. Histologic lesions of fibrous endarteritis]. Arch Mal Coeur Vaiss 1971; 64:1711-33. [PMID: 5004458] [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: 01/13/2023]
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26
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Degeorges M, Heintz C, Valty J, Drouhet E, Acar JF, Leduc G. [Infectious endocarditis due to Listeria monocytogenes and Cephalosporium]. Presse Med (1893) 1971; 79:1377-80. [PMID: 4999166] [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: 01/13/2023]
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27
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Leduc G, Guiha N. [Evaluation of aptine, a new adrenergic beta blockader, in angina pectoris]. Union Med Can 1971; 100:969-72. [PMID: 4147301] [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: 01/09/2023]
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28
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Ecoiffier J, Fournier A, Leduc G, Plainfosse MC. [What is the significance of the arteriographic discovery of stenosis in pheochromocytoma]. Presse Med (1893) 1970; 78:2325-2328. [PMID: 5496187] [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: 05/21/2023]
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29
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Kaufmann H, Dubost C, Guilmet D, Cachera JP, Ecoiffier J, Leduc G. [Solitary aneurysm of the right coronary artery treated successfully by resection and saphenous graft]. Arch Mal Coeur Vaiss 1970; 63:1154-66. [PMID: 4991724] [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: 01/13/2023]
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30
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Leduc G, de Bray P, Levert D, Lapalme N, Robitaille M. [The psychiatric film: a new therapeutic contribution?]. Laval Med 1970; 41:456-464. [PMID: 5515662] [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: 05/21/2023]
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31
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Leduc G. [Current state of tuberculosis]. Union Med Can 1969; 98:1939-42. [PMID: 5362146] [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: 01/14/2023]
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32
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Leduc G, Bourbeau D. [Intestinal intraparietal hemorrhage due to administration of anticoagulants]. Union Med Can 1969; 98:1321-4. [PMID: 5312092] [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: 01/14/2023]
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33
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Leduc G, Marion P, Davignon A. [Congenital complete auriculo-ventricular block]. Union Med Can 1968; 97:1029-34. [PMID: 5674550] [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: 01/16/2023]
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34
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Nadeau R, Kételers JY, Leduc G. [Adams-Stokes syndrome and paroxysmal auricular tachyarryhthmia]. Union Med Can 1967; 96:274-7. [PMID: 5615014] [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: 01/15/2023]
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35
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Leduc G. [Report of a study of the pathological consequences of chronic exposure to sulfur anhydride, hydrogen sulfide and chlorine dioxide]. Arch Mal Prof 1967; 28:307-11. [PMID: 5598617] [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: 01/15/2023]
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36
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Leduc G. [Wolff-Parkinson-White syndrome]. Union Med Can 1965; 94:805-7. [PMID: 5836073] [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: 01/16/2023]
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37
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Leduc G. [Psychiatric consultation in the general hospital]. Union Med Can 1965; 94:500-3. [PMID: 5827746] [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: 01/16/2023]
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