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van der Heyden B, Heymans SV, Carlier B, Collado-Lara G, Sterpin E, D’hooge J. Deep learning for dose assessment in radiotherapy by the super-localization of vaporized nanodroplets in high frame rate ultrasound imaging. Phys Med Biol 2022; 67. [DOI: 10.1088/1361-6560/ac6cc3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 05/04/2022] [Indexed: 11/12/2022]
Abstract
Abstract
Objective. External beam radiotherapy is aimed to precisely deliver a high radiation dose to malignancies, while optimally sparing surrounding healthy tissues. With the advent of increasingly complex treatment plans, the delivery should preferably be verified by quality assurance methods. Recently, online ultrasound imaging of vaporized radiosensitive nanodroplets was proposed as a promising tool for in vivo dosimetry in radiotherapy. Previously, the detection of sparse vaporization events was achieved by applying differential ultrasound (US) imaging followed by intensity thresholding using subjective parameter tuning, which is sensitive to image artifacts. Approach. A generalized deep learning solution (i.e. BubbleNet) is proposed to localize vaporized nanodroplets on differential US frames, while overcoming the aforementioned limitation. A 5-fold cross-validation was performed on a diversely composed 5747-frame training/validation dataset by manual segmentation. BubbleNet was then applied on a test dataset of 1536 differential US frames to evaluate dosimetric features. The intra-observer variability was determined by scoring the Dice similarity coefficient (DSC) on 150 frames segmented twice. Additionally, the BubbleNet generalization capability was tested on an external test dataset of 432 frames acquired by a phased array transducer at a much lower ultrasound frequency and reconstructed with unconventional pixel dimensions with respect to the training dataset. Main results. The median DSC in the 5-fold cross validation was equal to ∼0.88, which was in line with the intra-observer variability (=0.86). Next, BubbleNet was employed to detect vaporizations in differential US frames obtained during the irradiation of phantoms with a 154 MeV proton beam or a 6 MV photon beam. BubbleNet improved the bubble-count statistics by ∼30% compared to the earlier established intensity-weighted thresholding. The proton range was verified with a −0.8 mm accuracy. Significance. BubbleNet is a flexible tool to localize individual vaporized nanodroplets on experimentally acquired US images, which improves the sensitivity compared to former thresholding-weighted methods.
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Toumia Y, Pullia M, Domenici F, Facoetti A, Ferrarini M, Heymans SV, Carlier B, Van Den Abeele K, Sterpin E, D'hooge J, D'Agostino E, Paradossi G. Ultrasound-assisted carbon ion dosimetry and range measurement using injectable polymer-shelled phase-change nanodroplets: in vitro study. Sci Rep 2022; 12:8012. [PMID: 35568710 PMCID: PMC9107472 DOI: 10.1038/s41598-022-11524-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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 04/20/2022] [Indexed: 11/09/2022] Open
Abstract
Methods allowing for in situ dosimetry and range verification are essential in radiotherapy to reduce the safety margins required to account for uncertainties introduced in the entire treatment workflow. This study suggests a non-invasive dosimetry concept for carbon ion radiotherapy based on phase-change ultrasound contrast agents. Injectable nanodroplets made of a metastable perfluorobutane (PFB) liquid core, stabilized with a crosslinked poly(vinylalcohol) shell, are vaporized at physiological temperature when exposed to carbon ion radiation (C-ions), converting them into echogenic microbubbles. Nanodroplets, embedded in tissue-mimicking phantoms, are exposed at 37 °C to a 312 MeV/u clinical C-ions beam at different doses between 0.1 and 4 Gy. The evaluation of the contrast enhancement from ultrasound imaging of the phantoms, pre- and post-irradiation, reveals a significant radiation-triggered nanodroplets vaporization occurring at the C-ions Bragg peak with sub-millimeter shift reproducibility and dose dependency. The specific response of the nanodroplets to C-ions is further confirmed by varying the phantom position, the beam range, and by performing spread-out Bragg peak irradiation. The nanodroplets' response to C-ions is influenced by their concentration and is dose rate independent. These early findings show the ground-breaking potential of polymer-shelled PFB nanodroplets to enable in vivo carbon ion dosimetry and range verification.
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Affiliation(s)
- Yosra Toumia
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy. .,National Institute for Nuclear Physics, INFN Sez. Roma Tor Vergata, 00133, Rome, Italy.
| | - Marco Pullia
- Fondazione CNAO, The National Center of Oncological Hadrontherapy, 27100, Pavia, Italy
| | - Fabio Domenici
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy.,National Institute for Nuclear Physics, INFN Sez. Roma Tor Vergata, 00133, Rome, Italy
| | - Angelica Facoetti
- Fondazione CNAO, The National Center of Oncological Hadrontherapy, 27100, Pavia, Italy
| | - Michele Ferrarini
- Fondazione CNAO, The National Center of Oncological Hadrontherapy, 27100, Pavia, Italy
| | - Sophie V Heymans
- Department of Physics, KU Leuven Campus Kulak, Kortrijk, Belgium.,Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium.,Biomedical Engineering, Department of Cardiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Bram Carlier
- Department of Oncology, KU Leuven, Leuven, Belgium
| | | | | | - Jan D'hooge
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | | | - Gaio Paradossi
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy.,National Institute for Nuclear Physics, INFN Sez. Roma Tor Vergata, 00133, Rome, Italy
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Collado-Lara G, Heymans SV, Rovituso M, Carlier B, Toumia Y, Verweij M, Paradossi G, Sterpin E, Vos HJ, D'hooge J, de Jong N, Van Den Abeele K, Daeichin V. Spatiotemporal Distribution of Nanodroplet Vaporization in a Proton Beam Using Real-Time Ultrasound Imaging for Range Verification. Ultrasound Med Biol 2022; 48:149-156. [PMID: 34629191 DOI: 10.1016/j.ultrasmedbio.2021.09.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 09/06/2021] [Accepted: 09/07/2021] [Indexed: 06/13/2023]
Abstract
The potential of proton therapy to improve the conformity of the delivered dose to the tumor volume is currently limited by range uncertainties. Injectable superheated nanodroplets have recently been proposed for ultrasound-based in vivo range verification, as these vaporize into echogenic microbubbles on proton irradiation. In previous studies, offline ultrasound images of phantoms with dispersed nanodroplets were acquired after irradiation, relating the induced vaporization profiles to the proton range. However, the aforementioned method did not enable the counting of individual vaporization events, and offline imaging cannot provide real-time feedback. In this study, we overcame these limitations using high-frame-rate ultrasound imaging with a linear array during proton irradiation of phantoms with dispersed perfluorobutane nanodroplets at 37°C and 50°C. Differential image analysis of subsequent frames allowed us to count individual vaporization events and to localize them with a resolution beyond the ultrasound diffraction limit, enabling spatial and temporal quantification of the interaction between ionizing radiation and nanodroplets. Vaporization maps were found to accurately correlate with the stopping distribution of protons (at 50°C) or secondary particles (at both temperatures). Furthermore, a linear relationship between the vaporization count and the number of incoming protons was observed. These results indicate the potential of real-time high-frame-rate contrast-enhanced ultrasound imaging for proton range verification and dosimetry.
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Affiliation(s)
- Gonzalo Collado-Lara
- Biomedical Engineering, Department of Cardiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands.
| | - Sophie V Heymans
- Biomedical Engineering, Department of Cardiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands; Department of Physics, KU Leuven Campus Kulak, Kortrijk, Belgium; Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | | | - Bram Carlier
- Department of Oncology, KU Leuven, Leuven, Belgium
| | - Yosra Toumia
- Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
| | - Martin Verweij
- Biomedical Engineering, Department of Cardiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands; Department of Medical Imaging, TU Delft, Delft, The Netherlands
| | - Gaio Paradossi
- Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
| | | | - Hendrik J Vos
- Biomedical Engineering, Department of Cardiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands; Department of Medical Imaging, TU Delft, Delft, The Netherlands
| | - Jan D'hooge
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Nico de Jong
- Biomedical Engineering, Department of Cardiology, Erasmus MC University Medical Center, Rotterdam, The Netherlands; Department of Medical Imaging, TU Delft, Delft, The Netherlands
| | | | - Verya Daeichin
- Department of Medical Imaging, TU Delft, Delft, The Netherlands
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Reynders H, Van Zundert I, Silva R, Carlier B, Deschaume O, Bartic C, Rocha S, Basov S, Van Bael MJ, Himmelreich U, Verbiest T, Zamora A. Label-Free Iron Oxide Nanoparticles as Multimodal Contrast Agents in Cells Using Multi-Photon and Magnetic Resonance Imaging. Int J Nanomedicine 2021; 16:8375-8389. [PMID: 35002233 PMCID: PMC8722578 DOI: 10.2147/ijn.s334482] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 09/02/2021] [Accepted: 10/29/2021] [Indexed: 12/25/2022] Open
Abstract
INTRODUCTION The inherent fluorescence properties of iron oxide nanoparticles (IONPs) were characterized, and their applicability for multiphoton imaging in cells was tested in combination with their magnetic resonance imaging (MRI) capabilities. METHODS Superparamagnetic iron oxide nanoparticles were synthesized and subsequently coated with polyethylene glycol to make them water-dispersible. Further characterization of the particles was performed using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), dynamic light scattering (DLS), superconducting quantum interference device (SQUID) and magnetic resonance relaxivity measurements. MRI and fluorescence properties of bare IONPs were first studied in solution and subsequently in A549-labeled cells. RESULTS The particles, with a core size of 11.3 ± 4.5 nm, showed a good negative MRI contrast in tissue-mimicking phantoms. In vitro studies in mammalian A549 cells demonstrate that these IONPs are biocompatible and can also produce significant T2/T2* contrast enhancement in IONPs-labeled cells. Furthermore, excitation-wavelength dependent photoluminescence was observed under one- and two-photon excitation. DISCUSSION The obtained results indicated that IONPs could be used for fluorescence label-free bioimaging at multiple wavelengths, which was proven by multiphoton imaging of IONPs internalization in A549 cancer cells.
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Affiliation(s)
| | | | - Rui Silva
- Molecular Imaging and Photonics, KU Leuven, Leuven, Belgium
- Engineering Department, Oporto University, Porto, Portugal
- Biomedical MRI, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | - Bram Carlier
- Biomedical MRI, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | - Olivier Deschaume
- Laboratory for Soft Matter and Biophysics, KU Leuven, Leuven, Belgium
| | - Carmen Bartic
- Laboratory for Soft Matter and Biophysics, KU Leuven, Leuven, Belgium
| | - Susana Rocha
- Molecular Imaging and Photonics, KU Leuven, Leuven, Belgium
| | - Sergey Basov
- Quantum Solid State Physics, KU Leuven, Leuven, Belgium
| | | | - Uwe Himmelreich
- Biomedical MRI, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | | | - Ana Zamora
- Molecular Imaging and Photonics, KU Leuven, Leuven, Belgium
- Biomedical MRI, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
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Toumia Y, Miceli R, Domenici F, Heymans SV, Carlier B, Cociorb M, Oddo L, Rossi P, D'Angellilo RM, Sterpin E, D'Agostino E, Van Den Abeele K, D'hooge J, Paradossi G. Ultrasound-assisted investigation of photon triggered vaporization of poly(vinylalcohol) phase-change nanodroplets: A preliminary concept study with dosimetry perspective. Phys Med 2021; 89:232-242. [PMID: 34425514 DOI: 10.1016/j.ejmp.2021.08.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 06/08/2021] [Accepted: 08/10/2021] [Indexed: 01/24/2023] Open
Abstract
PURPOSE We investigate the vaporization of phase-change ultrasound contrast agents using photon radiation for dosimetry perspectives in radiotherapy. METHODS We studied superheated perfluorobutane nanodroplets with a crosslinked poly(vinylalcohol) shell. The nanodroplets' physico-chemical properties, and their acoustic transition have been assessed firstly. Then, poly(vinylalcohol)-perfluorobutane nanodroplets were dispersed in poly(acrylamide) hydrogel phantoms and exposed to a photon beam. We addressed the effect of several parameters influencing the nanodroplets radiation sensitivity (energy/delivered dose/dose rate/temperature). The nanodroplets-vaporization post-photon exposure was evaluated using ultrasound imaging at a low mechanical index. RESULTS Poly(vinylalcohol)-perfluorobutane nanodroplets show a good colloidal stability over four weeks and remain highly stable at temperatures up to 78 °C. Nanodroplets acoustically-triggered phase transition leads to microbubbles with diameters <10 μm and an activation threshold of mechanical index = 0.4, at 7.5 MHz. A small number of vaporization events occur post-photon exposure (6MV/15MV), at doses between 2 and 10 Gy, leading to ultrasound contrast increase up to 60% at RT. The nanodroplets become efficiently sensitive to photons when heated to a temperature of 65 °C (while remaining below the superheat limit temperature) during irradiation. CONCLUSIONS Nanodroplets' core is linked to the degree of superheat in the metastable state and plays a critical role in determining nanodroplet' stability and sensitivity to ionizing radiation, requiring higher or lower linear energy transfer vaporization thresholds. While poly(vinylalcohol)-perfluorobutane nanodroplets could be slightly activated by photons at ambient conditions, a good balance between the degree of superheat and stability will aim at optimizing the design of nanodroplets to reach high sensitivity to photons at physiological conditions.
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Affiliation(s)
- Yosra Toumia
- Department of Chemical Science and Technology, University of Rome Tor Vergata, Italy; INFN sez.Roma Tor Vergata, Italy.
| | - Roberto Miceli
- Radiotherapy Unit, Department of Oncology and Hematology, University Hospital Tor Vergata (PTV), University of Rome Tor Vergata, Italy
| | - Fabio Domenici
- Department of Chemical Science and Technology, University of Rome Tor Vergata, Italy; INFN sez.Roma Tor Vergata, Italy
| | - Sophie V Heymans
- Department of Physics, KU Leuven Campus Kulak, Kortrijk, Belgium; Department of Biomedical Engineering, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Bram Carlier
- Department of Oncology, KU Leuven, Leuven, Belgium
| | - Madalina Cociorb
- Department of Chemical Science and Technology, University of Rome Tor Vergata, Italy; DoseVue, Hasselt, Belgium
| | - Letizia Oddo
- Department of Chemical Science and Technology, University of Rome Tor Vergata, Italy
| | - Piero Rossi
- Department of Surgical Sciences, PTV, University of Rome Tor Vergata, Italy
| | - Rolando Maria D'Angellilo
- Radiotherapy Unit, Department of Oncology and Hematology, University Hospital Tor Vergata (PTV), University of Rome Tor Vergata, Italy
| | | | | | | | - Jan D'hooge
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Gaio Paradossi
- Department of Chemical Science and Technology, University of Rome Tor Vergata, Italy; INFN sez.Roma Tor Vergata, Italy
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Heymans SV, Carlier B, Toumia Y, Nooijens S, Ingram M, Giammanco A, d'Agostino E, Crijns W, Bertrand A, Paradossi G, Himmelreich U, D'hooge J, Sterpin E, Van Den Abeele K. Modulating ultrasound contrast generation from injectable nanodroplets for proton range verification by varying the degree of superheat. Med Phys 2021; 48:1983-1995. [PMID: 33587754 DOI: 10.1002/mp.14778] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 09/26/2020] [Revised: 01/21/2021] [Accepted: 02/08/2021] [Indexed: 12/25/2022] Open
Abstract
PURPOSE Despite the physical benefits of protons over conventional photon radiation in cancer treatment, range uncertainties impede the ability to harness the full potential of proton therapy. While monitoring the proton range in vivo could reduce the currently adopted safety margins, a routinely applicable range verification technique is still lacking. Recently, phase-change nanodroplets were proposed for proton range verification, demonstrating a reproducible relationship between the proton range and generated ultrasound contrast after radiation-induced vaporization at 25°C. In this study, previous findings are extended with proton irradiations at different temperatures, including the physiological temperature of 37°C, for a novel nanodroplet formulation. Moreover, the potential to modulate the linear energy transfer (LET) threshold for vaporization by varying the degree of superheat is investigated, where the aim is to demonstrate vaporization of nanodroplets directly by primary protons. METHODS Perfluorobutane nanodroplets with a shell made of polyvinyl alcohol (PVA-PFB) or 10,12-pentacosadyinoic acid (PCDA-PFB) were dispersed in polyacrylamide hydrogels and irradiated with 62 MeV passively scattered protons at temperatures of 37°C and 50°C. Nanodroplet transition into echogenic microbubbles was assessed using ultrasound imaging (gray value and attenuation analysis) and optical images. The proton range was measured independently and compared to the generated contrast. RESULTS Nanodroplet design proved crucial to ensure thermal stability, as PVA-shelled nanodroplets dramatically outperformed their PCDA-shelled counterpart. At body temperature, a uniform radiation response proximal to the Bragg peak is attributed to nuclear reaction products interacting with PVA-PFB nanodroplets, with the 50% drop in ultrasound contrast being 0.17 mm ± 0.20 mm (mean ± standard deviation) in front of the proton range. Also at 50°C, highly reproducible ultrasound contrast profiles were obtained with shifts of -0.74 mm ± 0.09 mm (gray value analysis), -0.86 mm ± 0.04 mm (attenuation analysis) and -0.64 mm ± 0.29 mm (optical analysis). Moreover, a strong contrast enhancement was observed near the Bragg peak, suggesting that nanodroplets were sensitive to primary protons. CONCLUSIONS By varying the degree of superheat of the nanodroplets' core, one can modulate the intensity of the generated ultrasound contrast. Moreover, a submillimeter reproducible relationship between the ultrasound contrast and the proton range was obtained, either indirectly via the visualization of secondary reaction products or directly through the detection of primary protons, depending on the degree of superheat. The potential of PVA-PFB nanodroplets for in vivo proton range verification was confirmed by observing a reproducible radiation response at physiological temperature, and further studies aim to assess the nanodroplets' performance in a physiological environment. Ultimately, cost-effective online or offline ultrasound imaging of radiation-induced nanodroplet vaporization could facilitate the reduction of safety margins in treatment planning and enable adaptive proton therapy.
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Affiliation(s)
- Sophie V Heymans
- Department of Physics, KU Leuven Campus Kulak, Kortrijk, Belgium
| | - Bram Carlier
- Department of Oncology, KU Leuven, Leuven, Belgium.,Molecular Small Animal Imaging Center, KU Leuven, Leuven, Belgium
| | - Yosra Toumia
- Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
| | - Sjoerd Nooijens
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Marcus Ingram
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | | | | | | | | | - Gaio Paradossi
- Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
| | - Uwe Himmelreich
- Molecular Small Animal Imaging Center, KU Leuven, Leuven, Belgium.,Department of Imaging & Pathology, KU Leuven, Leuven, Belgium
| | - Jan D'hooge
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
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Carlier B, Heymans SV, Nooijens S, Toumia Y, Ingram M, Paradossi G, D’Agostino E, Himmelreich U, D’hooge J, Van Den Abeele K, Sterpin E. Proton range verification with ultrasound imaging using injectable radiation sensitive nanodroplets: a feasibility study. ACTA ACUST UNITED AC 2020; 65:065013. [DOI: 10.1088/1361-6560/ab7506] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Sindic C, Stevens W, Knoops P, Bogaert M, Eyckmans L, Carlier B. Book Review. Acta Clin Belg 2016. [DOI: 10.1080/22953337.1982.11718897] [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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Christophe B, Carlier B, Schunack W, Chatelain P, Peck M, Massingham R. Contractile properties of various histaprodifen derivatives in guinea pig isolated ileum and trachea. Pharmacology 2006; 79:104-13. [PMID: 17164592 DOI: 10.1159/000097929] [Citation(s) in RCA: 1] [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] [Received: 10/23/2006] [Accepted: 11/03/2006] [Indexed: 11/19/2022]
Abstract
We characterized the histamine H(1) receptor agonism of various histaprodifen derivatives in guinea pig isolated ileum and trachea in comparison with histamine. Based on their affinity (calculated pK(A) values for ileum and trachea, respectively), the compounds were ranked as follows: suprahistaprodifen (8.31/8.08) > N(alpha)-(4-phenylbutyl)histaprodifen (7.22/5.93) >or= histamine (5.79/5.19) approximately methylhistaprodifen (5.57/6.07). Based on their efficacy (calculated tau values for ileum and trachea, respectively), the compounds were ranked as follows: methylhistaprodifen (37.67/2.50) > histamine (5.64/1.80) > suprahistaprodifen (1.63/1.42) >or= N(alpha)-(4-phenylbutyl)histaprodifen (0.083/1.54). In the ileum, histamine and methylhistaprodifen showed a high histamine H(1) receptor reserve while suprahistaprodifen and N(alpha)-(4-phenylbutyl)histaprodifen are devoid of any histamine H(1 )receptor reserve. On the trachea, no histamine H(1 )receptor reserve was demonstrable with the four tested agonists. The kinetic of contraction/relaxation of the ileum was faster with histamine and methylhistaprodifen than with suprahistaprodifen and N(alpha)-(4-phenylbutyl)histaprodifen. Histamine contracted the trachea faster than histaprodifen derivatives. Levocetirizine antagonized contractions induced by histamine and histaprodifen derivatives in both tissues. The differences observed in the calculated pA(2) (7.60-8.29) and/or pD'(2) values (6.28-7.90) depending on the tissue and/or the agonist are discussed.
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Affiliation(s)
- B Christophe
- Department of Investigative Pharmacology, UCB SA, Braine l'Alleud, Belgium.
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10
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Christophe B, Carlier B, Schunack W, Chatelain P, Peck MJ, Massingham R. Histamine H1-agonist properties of histaprodifen derivatives on guinea-pig isolated trachea and ileum. Inflamm Res 2003; 52 Suppl 1:S51-2. [PMID: 12755408 DOI: 10.1007/s000110300051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- B Christophe
- UCB Pharma Sector, Respiratory Pharmacology Department, Chemin Du Foriest, 1420 Braine l'Alleud, Belgium.
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Abstract
We report on four patients, from three different families, with Senior-Loken syndrome (SLS). They were unusual in that they reached end-stage renal failure (ESRF) only during the fifth or sixth decade. SLS is an autosomal-recessive disorder defined by the association of nephronophthisis and retinal dystrophy. Affected individuals invariably progress to ESRF, usually before the age of 20 years. The diagnosis was based on typical clinical presentation and characteristic renal histology, that is, a picture of chronic interstitial nephritis with pronounced thickening and multilayering of tubular basement membranes. Deterioration of renal function was slow, leading to ESRF between the ages of 42 and 56 years. Retinal dystrophy, already symptomatic during childhood in two patients, led to severe visual impairment in all. In contrast with four cases of SLS recently reported in very young patients, the NPH1 gene (the main gene responsible for nephronophthisis) was not deleted in our two tested patients. We conclude that SLS should be considered in adults who suffer from both chronic interstitial nephropathy and retinal degeneration. Whether the SLS is a variant of nephronophthisis and whether early- and late-onset renal failure in SLS is accounted for by genetic or allelic heterogeneity remain to be determined.
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Affiliation(s)
- B Georges
- Université Catholique de Louvain Medical School, Department of Nephrology, Pathology, Genetics, and Ophthalmology, Cliniques Universitaires St-Luc, Brussels, Belgium
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Polus M, Hamels J, Dorzee J, Henkinbrant A, Carlier B, d'Odemont JP. [Wegener's granulomatosis: clinical, radiological and diagnostic characteristics. Apropos of a case]. Acta Clin Belg 1995; 50:291-6. [PMID: 8533530 DOI: 10.1080/17843286.1995.11718464] [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: 01/31/2023]
Abstract
The authors report an observation of Wegener's granulomatosis with pulmonary, bronchial, renal, cutaneous and sinusal involvement. Five years ago, the patient was referred to us because of bilateral diffuse pulmonary infiltrates of unknown origin. A corticotherapy was introduced at that time and a complete clearance of the pulmonary infiltrates was noted. Nineteen months after the treatment's withdrawal, the disease recurs with the reappearance of pulmonary infiltrates. Beyond these unusual clinical aspects, histological examination of the bronchial biopsies were of diagnostic value.
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Affiliation(s)
- M Polus
- Services de Médecine, Interne et de Radiologie, Clinique Saint-Joseph, Mons, Belgique
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Abstract
We describe the case of a 63-year-old woman with an IgD-type multiple myeloma and hyperamylasaemia. The evolution of the amylase concentration, the immunohistochemical data and the intracellular amylase contents of the plasma cell were consistent with secretion of amylase by the malignant clone. Moreover, cytogenetic analysis of the bone marrow revealed two structural rearrangements involving chromosome 1 near the amylase locus. Multiple myeloma should be added to the amylase-secreting tumours. This rare entity is not confined to Japan, where it was first recognized.
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Affiliation(s)
- A Delannoy
- Hôpital de Jolimont, La Louvière, Belgium
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Langhendries JP, Gillain N, Battisti O, Carlier B, Bertrand JM. Normal values for urinary N-acetyl-beta-glucosaminidase excretion in preterm and term babies. Arch Dis Child 1987; 62:483-6. [PMID: 3606181 PMCID: PMC1778400 DOI: 10.1136/adc.62.5.483] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Urinary N-acetyl-beta-glucosaminidase (NAG) excretion was measured in 14 healthy, preterm, male neonates with gestational ages between 32 and 35 weeks. Daily NAG excretion increased significantly during the first four weeks of life. No correlation was observed between urinary NAG:creatinine ratio and postnatal age regardless of whether measurements were taken from the whole 24 hour urine collection or from an isolated urine spot sample at the same time on each day. When the preterm infants were compared with a group of 20 healthy, full term, male infants at a postnatal age of 7 days the NAG:creatinine ratio was significantly higher in the preterm group, the measurements having been taken from single urine spot samples. We suggest that this variable be used in the evaluation of renal tubular integrity during the neonatal period.
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Dupont P, Carlier B, Marchetti M, Ducobu J, Van der Donckt C. Effect of cimetidine on serum carboxyl and aminoterminal fragments of parathyroid hormone in chronic uraemic patients. Acta Endocrinol (Copenh) 1984; 105:66-71. [PMID: 6695546 DOI: 10.1530/acta.0.1050066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The effect of cimetidine on abnormally elevated serum levels of parathyroid hormone was studied in 21 patients with secondary hyperparathyroidism due to chronic renal failure, receiving regular dialysis treatment. The concentrations of carboxyl (-COOH) and aminoterminal (-NH2) fragments of circulating immunoreactive parathyroid hormone (iPTH) were determined before and after 2 months af treatment with cimetidine 400 mg/day. All patients had, on admission, raised levels of either hormonal fragment. The mean pre-treatment value was 17.2 mU/ml for -COOH terminus (upper normal limit 6.5 mU/ml) and 5.7 mU/ml for -NH2 terminus (upper normal limit 1.9 mU/ml). At the end of cimetidine treatment the mean values were 19.9 and 5.7 mU/ml respectively for the two forms of circulating iPTH. No changes in total serum calcium, phosphate or alkaline phosphatase activity were recorded during the study. These results do not indicate any lowering effect of cimetidine on serum iPTH in chronic uraemic patients with secondary hyperparathyroidism.
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Dupont P, Ducobu J, Carlier B. [long-term therapy of severe arterial hypertension with minoxidil, A new powerful vasodilator]. Acta Clin Belg 1981; 36:77-86. [PMID: 6794280 DOI: 10.1080/22953337.1981.11718787] [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: 01/21/2023]
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Carlier B, Favre H, Busset R. [A study of body fluid compartments in 42 cases of weight loss. Isotope dissection method]. Pathol Biol (Paris) 1969; 17:337-49. [PMID: 4893902] [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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Carlier B, Favre H, Busset R, Jenny M, Mach RS. [Body composition in hyperthyroidism (simultaneous isotopic dissection of (6 cases)]. Rev Fr Etud Clin Biol 1969; 14:354-60. [PMID: 4897169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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