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Karanasiou G, Grigoriadis G, Alexandraki A, Antoniades A, Brown C, Bucur A, Cipolla C, Economopoulou P, Foukakis T, Goossens J, Keramida K, Lakkas L, Marias K, Naka K, Papakonstantinou A, Pravettoni G, Ribnikar D, Šeruga B, Zacharia M, Tsiknakis M, Fotiadis D. A multimodal approach for the management of co-morbid cardiotoxicity in the elderly breast cancer patients. Eur J Cancer 2022. [DOI: 10.1016/s0959-8049(22)01456-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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2
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Saez J, Bar-Deroma R, Bogaert E, Cayez R, Chow T, Esposito M, Feygelman V, Monti A, Garcia-Miguel J, Gershkevitsh E, Goossens J, Herrero C, Hussein M, Khamphan C, Lechner W, Lemire M, Nevelsky A, Nguyen D, Paganini L, Passler M, Ramos Garcia L, Russo S, Shakeshaft J, Vieillevigne L, Hernandez V. OC-0120 MLC modelling assessment with a set of standardized tests: Results from a multicentric study. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02496-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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3
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De Saint-Hubert M, Castellano F, Crijns W, Kodaira S, Swakoń J, Leblans P, Verellen D, Goossens J, Akselrod M, de Freitas Nascimento L. Promises of film dosimetry based on radiophotoluminescence imaging in radiotherapy including charged particle beams. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00030-8] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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roussin C, Raffray L, Sultant-Bichat N, Christophe V, Goossens J, Bocquet V, Sadones-Scalbert C. Étude de la pagophagie dans un échantillon de 495 adultes bénéficiant d’une perfusion de fer. Rev Med Interne 2021. [DOI: 10.1016/j.revmed.2021.10.275] [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: 11/30/2022]
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Couillard F, Ayroulet C, Roussin C, Christophe V, Goossens J, Combres H, Ly K, Francois C. Une hypokaliémie symptomatique induite par une consommation excessive de Coca-Cola zéro®. Rev Med Interne 2020. [DOI: 10.1016/j.revmed.2020.10.281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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6
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De Freitas Nascimento L, Verellen D, Goossens J, Vanhavere F, Akselrod M. OC-0635: ImageDosis: 2D real-time dosimetry system. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00657-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Gille B, De Schaepdryver M, Goossens J, Dedeene L, De Vocht J, Oldoni E, Goris A, Van Den Bosch L, Depreitere B, Claeys KG, Tournoy J, Van Damme P, Poesen K. Serum neurofilament light chain levels as a marker of upper motor neuron degeneration in patients with Amyotrophic Lateral Sclerosis. Neuropathol Appl Neurobiol 2018; 45:291-304. [PMID: 29908069 DOI: 10.1111/nan.12511] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [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: 02/09/2018] [Accepted: 05/24/2018] [Indexed: 11/29/2022]
Abstract
AIMS Amyotrophic lateral sclerosis (ALS) is the most common motor neuron degeneration disease with a diagnostic delay of about 1 year after symptoms onset. In ALS, blood neurofilament light chain (NfL) levels are elevated, but it is not entirely clear what drives this increase and what the diagnostic performance of serum NfL is in terms of predictive values and likelihood ratios. The aims of this study were to further explore the prognostic and diagnostic performances of serum NfL to discriminate between patients with ALS and ALS mimics, and to investigate the relationship between serum NfL with motor neuron degeneration. METHODS The diagnostic performances of serum NfL were based on a cohort of 149 serum samples of patients with ALS, 19 serum samples of patients with a disease mimicking ALS and 82 serum samples of disease control patients. The serum NfL levels were correlated with the number of regions (thoracic, bulbar, upper limb and lower limb) displaying upper and/or lower motor neuron degeneration. The prognostic performances of serum NfL were investigated based on a Cox regression analysis. RESULTS The associated predictive values and likelihood ratio to discriminate patients with ALS and ALS mimics were established. Serum NfL was associated with motor neuron degeneration driven by upper motor neuron (UMN) degeneration and was independently associated with survival in patients with ALS. CONCLUSIONS Altogether, these findings suggest that elevated serum NfL levels in ALS are driven by UMN degeneration and the disease progression rate and are independently associated with survival at time of diagnosis.
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Affiliation(s)
- B Gille
- Laboratory for Molecular Neurobiomarker Research, Department of Neurosciences, KU Leuven, Leuven, Belgium.,Department of Chronic Disease, Metabolism and Ageing, KU Leuven, Leuven, Belgium
| | - M De Schaepdryver
- Laboratory for Molecular Neurobiomarker Research, Department of Neurosciences, KU Leuven, Leuven, Belgium.,Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
| | - J Goossens
- Laboratory for Molecular Neurobiomarker Research, Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - L Dedeene
- Laboratory for Molecular Neurobiomarker Research, Department of Neurosciences, KU Leuven, Leuven, Belgium.,Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
| | - J De Vocht
- Laboratory of Neurobiology, Department of Neurosciences, KU Leuven and Center for Brain & Disease Research VIB Leuven, Leuven, Belgium.,Department of Neurology, Neuromuscular Reference Centre, University Hospitals Leuven, Leuven, Belgium
| | - E Oldoni
- Laboratory for Neuroimmunology, Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - A Goris
- Laboratory for Neuroimmunology, Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - L Van Den Bosch
- Laboratory of Neurobiology, Department of Neurosciences, KU Leuven and Center for Brain & Disease Research VIB Leuven, Leuven, Belgium
| | - B Depreitere
- Department of Neurosurgery, Neuromuscular Reference Centre, University Hospitals Leuven, Leuven, Belgium.,Research Group Experimental Neurosurgery and Neuroanatomy, KU Leuven, Department of Neurosciences, Leuven, Belgium
| | - K G Claeys
- Department of Neurology, Neuromuscular Reference Centre, University Hospitals Leuven, Leuven, Belgium.,Laboratory for Muscle diseases and Neuropathies, Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - J Tournoy
- Department of Chronic Disease, Metabolism and Ageing, KU Leuven, Leuven, Belgium.,Alzheimer Research Centre KU Leuven, Leuven Institute of Neuroscience and Disease, Leuven, Belgium.,Department of Geriatric Medicine, University Hospitals Leuven, Leuven, Belgium
| | - P Van Damme
- Laboratory of Neurobiology, Department of Neurosciences, KU Leuven and Center for Brain & Disease Research VIB Leuven, Leuven, Belgium.,Department of Neurology, Neuromuscular Reference Centre, University Hospitals Leuven, Leuven, Belgium
| | - K Poesen
- Laboratory for Molecular Neurobiomarker Research, Department of Neurosciences, KU Leuven, Leuven, Belgium.,Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
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Goossens J, Courbebaisse M, Caudron E, Bahans C, Vacquerie V, Melchior J, Salle PV, Moesch C, Daudon M, Frocht V, Richette P, Ea HK, Guigonis V. Efficacy of intralesional sodium thiosulfate injections for disabling tumoral calcinosis: Two cases. Semin Arthritis Rheum 2017; 47:451-455. [PMID: 28779847 DOI: 10.1016/j.semarthrit.2017.05.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Revised: 05/10/2017] [Accepted: 05/30/2017] [Indexed: 01/11/2023]
Abstract
INTRODUCTION Tumoral calcinosis (TC) is a difficult-to-treat complication that can occur during several diseases such as dermatomyositis or genetic hyperphosphatemia. It is a painful and disabling condition that can lead to local complications including joint mobility reduction, cutaneous ulceration and superinfection. For the largest lesions, the treatment relies essentially on surgery. Intravenous sodium thiosulfate (STS) is efficient to treat calciphylaxis in patients undergoing hemodialysis. Local injections of STS seem efficient in superficial calcifications. OBJECTIVE To report the efficacy and safety of intra-lesional injections of STS in tumoral calcinosis. RESULTS We report two cases of successful intra-lesional injections of STS. A 44-year-old woman, with a history of dermatomyositis, presenting large subcutaneous calcifications in the right elbow, and a 42-year-old man, with a history of familial tumoral calcinosis, presenting large intramuscular calcifications in the right buttock, received weekly intra-lesional of 1-3g STS injections for 12 and 21 months, respectively. In both cases, the treatment relieved pain and greatly reduced the tumoral calcinosis with a very significant functional improvement without specific adverse effects. In case 1, TC size decreased from 28.7*56.0mm at baseline to 21.5*30.6mm at M12 treatment (59% reduction). In case 2, TC reduced from 167.5*204.3mm at baseline to 86.2*85.2mm at M21 treatment (79% reduction). CONCLUSION Local injection of STS could be a promising therapeutic strategy for large and deep TC lesions and could therefore be an alternative to surgery.
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Affiliation(s)
- J Goossens
- Service de rhumatologie, hôpital Lariboisière, centre Viggo Petersen, Paris, France
| | - M Courbebaisse
- AP-HP, Georges Pompidou European Hospital, Physiology Department, Paris Descartes University, and INSERM, Unit 1151, Paris, France
| | - E Caudron
- AP-HP, Hôpital Européen Georges Pompidou, Department of Pharmacy, Paris, France; Lip(Sys), Chimie analytique pharmaceutique EA 4041, Univ. Paris Sud, Université Paris-Saclay, Chatenay Malabry, France
| | - C Bahans
- Service de pédiatrie, Hopital de la Mère et de l'Enfant, Limoges, France
| | - V Vacquerie
- Service de chirurgie pédiatrique, Hopital de la Mère et de l'Enfant, Limoges, France
| | - J Melchior
- Service de Rhumatologie, Hopitaux de Brabois, Vandoeuvre les Nancy, France
| | - P Vergne Salle
- Service de Rhumatologie, Hôpital Dupuytren, Limoges, France
| | - C Moesch
- Service de Pharmacologie-toxicologie, Hôpital Dupuytren, Limoges, France
| | - M Daudon
- Service des explorations fonctionnelles, Hôpital Tenon, Paris, France
| | - V Frocht
- Service des explorations fonctionnelles, Hôpital Tenon, Paris, France
| | - P Richette
- Service de rhumatologie, hôpital Lariboisière, centre Viggo Petersen, Paris, France
| | - Hang-Korng Ea
- Service de rhumatologie, hôpital Lariboisière, centre Viggo Petersen, Paris, France.
| | - V Guigonis
- Service de pédiatrie, Hopital de la Mère et de l'Enfant, Limoges, France.
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Ombelet W, Goossens J. Global reproductive health - Why do we persist in neglecting the undeniable problem of childlessness in resource-poor countries? Facts Views Vis Obgyn 2017; 9:1-3. [PMID: 28721178 PMCID: PMC5506764] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
The consequences of involuntary childlessness in developing countries create more wide-ranging societal problems compared to Western societies, particularly for women. Negative psychosocial and economical consequences for childless couples are often severe and underestimated by the local and international society. Infertility treatment is often limited to certain procedures and certain costumers. Most common arguments against supporting infertility care in resource-poor countries are the "overpopulation" and the "limited resources" argument, but they totally neglect the reproductive rights and systematic exclusion of millions of women from the right to reproduce. Because ART procedures are very expensive, governments and international aid-organisations are currently not investing in this technique. But the scene has changed recently: inexpensive ovarian stimulation protocols for IVF have proven their value and simplified but high quality low cost IVF techniques are available nowadays. From an ethical point of view it is our belief that the community can no longer justify the systematic exclusion of one tenth of couples from the right to reproduce in resource-poor countries.
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Affiliation(s)
- W Ombelet
- Editor-in-Chief
- Genk Institute for Fertility Technology, ZOL Hospitals, Schiepse Bos 6, 3600 Genk, Belgium
- The Walking Egg non-profit Organization
- Hasselt University, Department of Physiology, Martelarenlaan 42, 3500 Hasselt, Belgium
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10
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Gerrits T, Van Rooij F, Esho T, Ndegwa W, Goossens J, Bilajbegovic A, Jansen A, Kioko B, Koppen L, Kemunto Migiro S, Mwenda S, Bos H. Infertility in the Global South: Raising awareness and generating insights for policy and practice. Facts Views Vis Obgyn 2017; 9:39-44. [PMID: 28721183 PMCID: PMC5506768] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Infertility is a highly prevalent reproductive health condition in the global South, which often has a devastating impact on the people concerned. Yet, thus far it hardly received any attention from policy makers, Non-Governmental Organizations (NGOs) or donors working in the field of Sexual and Reproductive Health and Rights (SRHR). For this reason we have set up a project to increase knowledge and awareness about infertility and childlessness among those stakeholders and organizations and to generate insight into (possible) interventions in this field. The project received a grant by Share-Net International (the Knowledge Platform in the field of SRHR, funded by the Dutch Ministry of Foreign Affairs) and is a unique collaboration between universities, fertility clinics, fertility support groups and the Walking Egg Foundation. The project consists of multimethods studies in Ghana and Kenya as well as dissemination workshops and meetings in these countries and the Netherlands. The first workshops in Kenya have already taken place with successful feedback from stakeholders. In this commentary we provide insight into the project and the main points and recommendations discussed in the Workshops in Kenya.
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Affiliation(s)
- T Gerrits
- University of Amsterdam, Amsterdam Institute of Social Science Research
| | - F Van Rooij
- University of Amsterdam, Research Institute Child Development and Education
| | - T Esho
- Technical University of Kenya, Department of Community and Public Health
| | - W Ndegwa
- Footsteps for Fertility Foundation, Nairobi, Kenya
| | | | - A Bilajbegovic
- University of Amsterdam, Amsterdam Institute of Social Science Research
| | - A Jansen
- University of Amsterdam, Research Institute Child Development and Education
| | - B Kioko
- Technical University of Kenya, Department of Community and Public Health
| | - L Koppen
- University of Amsterdam, Amsterdam Institute of Social Science Research
| | - S Kemunto Migiro
- Technical University of Kenya, Department of Community and Public Health
| | - S Mwenda
- Technical University of Kenya, Department of Community and Public Health
| | - H Bos
- University of Amsterdam, Research Institute Child Development and Education
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11
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Goossens J, Van Den Branden Y, Van der Sluys L, Delbaere I, Van Hecke A, Verhaeghe S, Beeckman D. The prevalence of unplanned pregnancy ending in birth, associated factors, and health outcomes. Hum Reprod 2016; 31:2821-2833. [PMID: 27798048 DOI: 10.1093/humrep/dew266] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 09/19/2016] [Accepted: 10/14/2016] [Indexed: 01/05/2023] Open
Abstract
STUDY QUESTION What are associated factors of unplanned pregnancies ending in birth? SUMMARY ANSWER Pregnancies that were less planned were associated with women of lower socio-economic status (SES), an unhealthier lifestyle before and during the pregnancy, more stress, and less social support. WHAT IS KNOWN ALREADY In Europe, the prevalence of unplanned pregnancy leading to birth varies. Unplanned pregnancy is more common among socially disadvantaged women, and associated with adverse pregnancy outcomes. STUDY DESIGN, SIZE, DURATION In a cross-sectional study, 517 women were recruited from May through September 2015. PARTICIPANTS/MATERIALS, SETTING, METHODS Women were recruited from six hospitals in Flanders, Belgium. Data from self-report and medical records were collected during the first 5 days postpartum. The validated London Measure of Unplanned Pregnancy was used to collect data regarding pregnancy planning. Data were analysed with Mann-Whitney U tests, Kruskal-Wallis tests, and multiple linear regression analysis. MAIN RESULTS AND THE ROLE OF CHANCE The majority of the pregnancies (83%) ending in birth were planned, 15% were ambivalent, and 2% unplanned. Women who are multigravida (95% CI -0.30 to -0.02), less well educated (95% CI 0.07-0.85), single or having a non-cohabiting relationship (95% CI 0.01-2.53), having history of drug abuse (95% CI -2.07 to -0.35), and experiencing intimate partner violence (95% CI -3.82 to -1.59) tended to have a significantly higher risk of a less planned pregnancy. Less planned pregnancies were significantly associated with initially unwanted pregnancies (P < 0.001), no folic acid or vitamin use before pregnancy (P < 0.001), lower number of prenatal visits (P = 0.03), smoking during pregnancy (P < 0.001), more stress (P = 0.002), lower relationship satisfaction (P = 0.001), and less social support (P < 0.001). Less planned pregnancies were also significantly associated with hyperemesis (P < 0.001) and shorter duration of delivery (P = 0.03). No differences were found in neonatal outcomes. LIMITATIONS, REASONS FOR CAUTION The prevalence of unplanned pregnancies is probably underestimated due to overrepresentation of women with higher SES in this study. Women's emotions may have influenced the answer to certain questions. Owing to the cross-sectional design, no causal relationships could be established. WIDER IMPLICATIONS OF THE FINDINGS This study emphasizes the importance of targeting socially disadvantaged women in the prevention of unplanned pregnancies. STUDY FUNDING/COMPETING INTERESTS This study was funded by the Research Foundation - Flanders (FWO). The authors have no conflict of interests. TRIAL REGISTRATION NUMBER Not applicable.
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Affiliation(s)
- J Goossens
- University Centre for Nursing & Midwifery, Department of Public Health , Ghent University, De Pintelaan 185,9000 Ghent, Belgium
| | - Y Van Den Branden
- University Centre for Nursing & Midwifery, Department of Public Health , Ghent University, De Pintelaan 185,9000 Ghent, Belgium.,Women's Clinic of Ghent University Hospital, University Hospital Ghent, De Pintelaan 185, 9000 Ghent, Belgium
| | - L Van der Sluys
- University Centre for Nursing & Midwifery, Department of Public Health , Ghent University, De Pintelaan 185,9000 Ghent, Belgium
| | - I Delbaere
- VIVES University College, Doorniksesteenweg 145, 8500 Kortrijk, Belgium
| | - A Van Hecke
- University Centre for Nursing & Midwifery, Department of Public Health , Ghent University, De Pintelaan 185,9000 Ghent, Belgium.,Nursing Science , University Hospital Ghent, De Pintelaan 185, 9000 Ghent, Belgium
| | - S Verhaeghe
- University Centre for Nursing & Midwifery, Department of Public Health , Ghent University, De Pintelaan 185,9000 Ghent, Belgium
| | - D Beeckman
- University Centre for Nursing & Midwifery, Department of Public Health , Ghent University, De Pintelaan 185,9000 Ghent, Belgium
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Ombelet W, Goossens J. The Walking Egg Project: how to start a TWE centre? Facts Views Vis Obgyn 2016; 8:119-124. [PMID: 27909569 PMCID: PMC5130301] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
The main objective of the Walking Egg non-profit organization is the implementation of good quality and affordable infertility centres in resource-poor countries. Three levels of assistance are suggested: A level 1 infertility clinic is a basic infertility clinic capable of offering semen analysis, hormonal assays, follicular scanning, ovulation induction and intrauterine inseminations. Level 2 infertility clinics are supposed to perform simplified IVF as well. Level 3 infertility clinics capable of offering ICSI, cryopreservation and operative endoscopy are not part of the Walking Egg Project in the initial phase. A high quality but affordable service delivery with special attention to the prevention of complications and unnecessary interventions should be the trademark of this project.
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Affiliation(s)
- W Ombelet
- Department of Obstetrics and Gynaecology, Ziekenhuizen Oost-Limburg, Schiepse Bos, 6, 3600 Genk, Belgium.,Faculty of Medicine and Life Sciences, Hasselt University, Agoralaan, 3590 Diepenbeek, Belgium.,"The Walking Egg non-profit organization"
| | - J Goossens
- "The Walking Egg non-profit organization"
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Goossens J, Ottaviani S, Coustet B, Palazzo E, Dieudé P. AB0357 Does the Body Mass Index (BMI) Influence the Clinical Assessment of Synovitis in Rheumatoid Arthritis? Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.4886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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14
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Platonov A, Goossens J. The role of lateral inhibition in binocular motion rivalry. J Vis 2013; 13:12. [DOI: 10.1167/13.6.12] [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: 11/24/2022] Open
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15
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Goossens J, Devreese M, Pasmans F, Osselaere A, De Baere S, Verbrugghe E, Haesebrouck F, De Backer P, Croubels S. Chronic exposure to the mycotoxin T-2 promotes oral absorption of chlortetracycline in pigs. J Vet Pharmacol Ther 2013; 36:621-4. [PMID: 23701633 DOI: 10.1111/jvp.12059] [Citation(s) in RCA: 2] [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] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Accepted: 05/05/2013] [Indexed: 11/29/2022]
Abstract
The aim of this study was to investigate whether T-2 toxin, a potent Fusarium mycotoxin, affects the oral absorption of the antibiotic chlortetracycline in pigs. Animals were allocated to blank feed without T-2 toxin (controls), feed containing 111 μg T-2/kg feed, T-2-contaminated feed supplemented with a yeast-derived feed additive, or blank feed supplemented solely with the feed additive, respectively. After 21 days, an intragastric bolus of chlortetracycline was given to assess potential alterations in the pharmacokinetics of this commonly used antibiotic. A significantly higher area under the plasma concentration-time curve and maximal plasma concentration of chlortetracycline was observed after intake of T-2-contaminated feed compared with control. Thus, exposure to T-2-contaminated feed can influence the oral bioavailability of chlortetracycline. This effect could have consequences for the withdrawal time of the drug and the occurrence of undesirable residues in edible tissues.
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Affiliation(s)
- J Goossens
- Department of Pharmacology, Toxicology and Biochemistry, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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Osselaere A, Li SJ, De Bock L, Devreese M, Goossens J, Vandenbroucke V, Van Bocxlaer J, Boussery K, Pasmans F, Martel A, De Backer P, Croubels S. Toxic effects of dietary exposure to T-2 toxin on intestinal and hepatic biotransformation enzymes and drug transporter systems in broiler chickens. Food Chem Toxicol 2013; 55:150-5. [PMID: 23313610 DOI: 10.1016/j.fct.2012.12.055] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 12/21/2012] [Accepted: 12/31/2012] [Indexed: 01/06/2023]
Abstract
The effects of the mycotoxin T-2 on hepatic and intestinal drug-metabolizing enzymes (cytochrome P450) and drug transporter systems (MDR1 and MRP2) in poultry were investigated during this study. Broiler chickens received either uncontaminated feed, feed contaminated with 68μg/kg or 752μg/kg T-2 toxin. After 3weeks, the animals were euthanized and MDR1, MRP2, CYP1A4, CYP1A5 and CYP3A37 mRNA expression were analyzed using qRT-PCR. Along the entire length of the small intestine no significant differences were observed. In the liver, genes coding for CYP1A4, CYP1A5 and CYP3A37 were significantly down-regulated in the group exposed to 752μg/kg T-2. For CYP1A4, even a contamination level of 68μg/kg T-2 caused a significant decrease in mRNA expression. Expression of MDR1 was not significantly decreased in the liver. In contrast, hepatic MRP2 expression was significantly down-regulated after exposure to 752μg/kg T-2. Hepatic and intestinal microsomes were prepared to test the enzymatic activity of CYP3A. In the ileum and liver CYP3A activity was significantly increased in the group receiving 752μg/kg T-2 compared to the control group. The results of this study show that drug metabolizing enzymes and drug transporter mechanisms can be influenced due to prolonged exposure to relevant doses of T-2.
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Affiliation(s)
- A Osselaere
- Department of Pharmacology, Toxicology and Biochemistry, Faculty of Veterinary Medicine, Ghent University, Belgium.
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Goossens J, De Bock L, Osselaere A, Verbrugghe E, Devreese M, Boussery K, Van Bocxlaer J, De Backer P, Croubels S. The mycotoxin T-2 inhibits hepatic cytochrome P4503A activity in pigs. Food Chem Toxicol 2013; 57:54-6. [PMID: 23524315 DOI: 10.1016/j.fct.2013.03.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 02/05/2013] [Accepted: 03/08/2013] [Indexed: 11/30/2022]
Abstract
Mycotoxins are toxic metabolites produced by fungi that readily colonize crops. After ingestion, these mycotoxins can compromise intestinal health, and once entering the blood stream, even affect the liver and its metabolizing enzymes. It was therefore the aim of the present study to investigate the effect of T-2 toxin, an emerging and potent Fusarium mycotoxin, on the enzymatic activity of cytochrome P4503A (CYP3A) metabolizing enzymes in the liver of pigs. In addition, a yeast-derived feed additive that claims to bind T-2 toxin was included in the study to evaluate its efficacy. Our results demonstrated that a 14-days intake of T-2 toxin contaminated feed at a dose of 903 μg/kg feed, whether or not combined with the mycotoxin binder, results in a substantial inhibition of the CYP3A activity in the liver of pigs. This result may be of importance for animal health, the pharmacokinetics and the withdrawal time of drugs that are substrate of CYP3A enzymes, and consequently can be a threat for public health with respect to tissue residues of these drugs.
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Affiliation(s)
- J Goossens
- Department of Pharmacology, Toxicology and Biochemistry, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium.
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Abstract
Registration of ego-motion is important to accurately navigate through space. Movements of the head and eye relative to space are registered through the vestibular system and optical flow, respectively. Here, we address three questions concerning the visual registration of self-rotation. (1) Eye-in-head movements provide a link between the motion signals received by sensors in the moving eye and sensors in the moving head. How are these signals combined into an ego-rotation percept? We combined optic flow of simulated forward and rotational motion of the eye with different levels of eye-in-head rotation for a stationary head. We dissociated simulated gaze rotation and head rotation by different levels of eye-in-head pursuit. We found that perceived rotation matches simulated head- not gaze-rotation. This rejects a model for perceived self-rotation that relies on the rotation of the gaze line. Rather, eye-in-head signals serve to transform the optic flow's rotation information, that specifies rotation of the scene relative to the eye, into a rotation relative to the head. This suggests that transformed visual self-rotation signals may combine with vestibular signals. (2) Do transformed visual self-rotation signals reflect the arrangement of the semi-circular canals (SCC)? Previously, we found sub-regions within MST and V6+ that respond to the speed of the simulated head rotation. Here, we re-analyzed those Blood oxygenated level-dependent (BOLD) signals for the presence of a spatial dissociation related to the axes of visually simulated head rotation, such as have been found in sub-cortical regions of various animals. Contrary, we found a rather uniform BOLD response to simulated rotation along the three SCC axes. (3) We investigated if subject's sensitivity to the direction of the head rotation axis shows SCC axes specifcity. We found that sensitivity to head rotation is rather uniformly distributed, suggesting that in human cortex, visuo-vestibular integration is not arranged into the SCC frame.
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Affiliation(s)
- D M Arnoldussen
- Department of Cognitive Neuroscience, Section Biophysics, Radboud University Nijmegen Medical Centre, Donders Institute for Brain, Cognition, and Behavior Nijmegen, Netherlands
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Osselaere A, Devreese M, Watteyn A, Vandenbroucke V, Goossens J, Hautekiet V, Eeckhout M, De Saeger S, De Baere S, De Backer P, Croubels S. Efficacy and safety testing of mycotoxin-detoxifying agents in broilers following the European Food Safety Authority guidelines. Poult Sci 2012; 91:2046-54. [PMID: 22802203 DOI: 10.3382/ps.2012-02245] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Contamination of feeds with mycotoxins is a worldwide problem and mycotoxin-detoxifying agents are used to decrease their negative effect. The European Food Safety Authority recently stated guidelines and end-points for the efficacy testing of detoxifiers. Our study revealed that plasma concentrations of deoxynivalenol and deepoxy-deoxynivalenol were too low to assess efficacy of 2 commercially available mycotoxin-detoxifying agents against deoxynivalenol after 3 wk of continuous feeding of this mycotoxin at concentrations of 2.44±0.70 mg/kg of feed and 7.54±2.20 mg/kg of feed in broilers. This correlates with the poor absorption of deoxynivalenol in poultry. A safety study with 2 commercially available detoxifying agents and veterinary drugs showed innovative results with regard to the pharmacokinetics of 2 antibiotics after oral dosing in the drinking water. The plasma and kidney tissue concentrations of oxytetracycline were significantly higher in broilers receiving a biotransforming agent in the feed compared with control birds. For amoxicillin, the plasma concentrations were significantly higher for broilers receiving an adsorbing agent in comparison to birds receiving the biotransforming agent, but not to the control group. Mycotoxin-detoxifying agents can thus interact with the oral bioavailability of antibiotics depending on the antibiotic and detoxifying agent, with possible adverse effects on the health of animals and humans.
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Affiliation(s)
- A Osselaere
- Department of Pharmacology, Toxicology and Biochemistry, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium.
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Arnoldussen D, Goossens J, van den Berg A. Where two eyes are better than one for processing heading. J Vis 2012. [DOI: 10.1167/12.9.751] [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: 11/24/2022] Open
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21
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Devreese M, Osselaere A, Goossens J, Vandenbroucke V, De Baere S, Eeckhout M, De Backer P, Croubels S. New bolus models forin vivoefficacy testing of mycotoxin-detoxifying agents in relation to EFSA guidelines, assessed using deoxynivalenol in broiler chickens. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2012; 29:1101-7. [DOI: 10.1080/19440049.2012.671788] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Schaeken B, Cuypers R, Goossens J, Van den Weyngaert D, Verellen D. Experimental determination of the energy response of alanine pellets in the high dose rate192Ir spectrum. Phys Med Biol 2011; 56:6625-34. [DOI: 10.1088/0031-9155/56/20/007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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De Baere S, Goossens J, Osselaere A, Devreese M, Vandenbroucke V, De Backer P, Croubels S. Quantitative determination of T-2 toxin, HT-2 toxin, deoxynivalenol and deepoxy-deoxynivalenol in animal body fluids using LC–MS/MS detection. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:2403-15. [DOI: 10.1016/j.jchromb.2011.06.036] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 06/08/2011] [Accepted: 06/26/2011] [Indexed: 10/18/2022]
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Arnoldussen DM, Goossens J, van den Berg AV. Multiple areas in human cerebral cortex contain visual representations of head rotation. J Vis 2010. [DOI: 10.1167/10.7.921] [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: 11/24/2022] Open
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26
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van den Berg AV, Arnoldussen D, Goossens J. The vestibular frame for visual perception of head rotation. J Vis 2010. [DOI: 10.1167/10.7.849] [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: 11/24/2022] Open
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27
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Van der Heyden S, Goossens J, Vandenbroucke V, Vercauteren G, Chiers K, Pasmans F, Haesebrouck F, De Backer P, Croubels S, Ducatelle R. Reduced expression of intestinal p-glycoprotein following ingestion of deoxynivalenol (DON) contaminatad feed in pigs. J Comp Pathol 2009. [DOI: 10.1016/j.jcpa.2009.07.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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28
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Goossens J, Daniel H, Rancillac A, van der Steen J, Oberdick J, Crépel F, De Zeeuw CI, Frens MA. Expression of protein kinase C inhibitor blocks cerebellar long-term depression without affecting Purkinje cell excitability in alert mice. J Neurosci 2001; 21:5813-23. [PMID: 11466453 PMCID: PMC6762649] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023] Open
Abstract
A longstanding but still controversial hypothesis is that long-term depression (LTD) of parallel fiber-Purkinje cell synapses in the cerebellum embodies part of the neuronal information storage required for associative motor learning. Transgenic mice in which LTD is blocked by Purkinje cell-specific inhibition of protein kinase C (PKC) (L7-PKCI mutants) do indeed show impaired adaptation of their vestibulo-ocular reflex, whereas the dynamics of their eye movement performance are unaffected. However, because L7-PKCI mutants have a persistent multiple climbing fiber innervation at least until 35 d of age and because the baseline discharge of the Purkinje cells in the L7-PKCI mutants is unknown, factors other than a blockage of LTD induction itself may underlie their impaired motor learning. We therefore investigated the spontaneous discharge of Purkinje cells in alert adult L7-PKCI mice as well as their multiple climbing fiber innervation beyond the age of 3 months. We found that the simple spike and complex spike-firing properties (such as mean firing rate, interspike interval, and spike count variability), oscillations, and climbing fiber pause in the L7-PKCI mutants were indistinguishable from those in their wild-type littermates. In addition, we found that multiple climbing fiber innervation does not occur in cerebellar slices obtained from 3- to 6-month-old mutants. These data indicate (1) that neither PKC inhibition nor the subsequent blockage of LTD induction disturbs the spontaneous discharge of Purkinje cells in alert mice, (2) that Purkinje cell-specific inhibition of PKC detains rather than prevents the developmental conversion from multiple to mono-innervation of Purkinje cells by climbing fibers, and (3) that as a consequence the impaired motor learning as observed in older adult L7-PKCI mutants cannot be attributable either to a disturbance in the baseline simple spike and complex spike activities of their Purkinje cells or to a persistent multiple climbing fiber innervation. We conclude that cerebellar LTD is probably one of the major mechanisms underlying motor learning, but that deficits in LTD induction and motor learning as observed in the L7-PKCI mutants may only be reflected in differences of the Purkinje cell signals during and/or directly after training.
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Affiliation(s)
- J Goossens
- Department of Physiology, Neuroscience Institute, Erasmus University Rotterdam, 3000 DR Rotterdam, The Netherlands
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29
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Van Wauwe J, Aerts F, Cools M, Deroose F, Freyne E, Goossens J, Hermans B, Lacrampe J, Van Genechten H, Van Gerven F, Van Nyen G. Identification of R146225 as a novel, orally active inhibitor of interleukin-5 biosynthesis. J Pharmacol Exp Ther 2000; 295:655-61. [PMID: 11046102] [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
Interleukin (IL)-5 regulates the growth, differentiation, and activation of eosinophils. When activated, eosinophils release an array of proinflammatory and cytotoxic products and act as prominent effector cells in the process of allergic inflammation. Depriving eosinophils of IL-5 may therefore represent a viable approach to treat allergic disorders. This study describes the identification of R146225, a novel six-substituted azauracil derivative, as a potent, orally active inhibitor of IL-5 biosynthesis, capable of reducing pulmonary eosinophilia in mice. In vitro, R146225 inhibited IL-5 protein formation by activated human whole blood (IC(50) = 34 nM), human peripheral blood mononuclear cells (IC(50) = 24 nM), and murine spleen cells (IC(50) = 6 nM). In contrast, the compound enhanced generation of interferon-gamma and had little or no inhibitory effect on the production of IL-2 and IL-4. Reverse transcription-polymerase chain reaction analysis of stimulated whole blood cells indicated R146225's ability to down-regulate IL-5 mRNA expression. In vivo p.o. administration of R146225 (2.5 mg/kg) to mice before an i.v. anti-CD3 antibody challenge reduced IL-5 but enhanced interferon-gamma serum levels, without affecting IL-2 and IL-4 production. Analogous to the in vitro results, R146225 suppressed splenic IL-5 mRNA expression, while message levels of the other cytokines remained unchanged. Moreover, p.o. dosing of R146225 (0.6-2.5 mg/kg) dose dependently reduced the pulmonary accumulation of eosinophils induced in mice by an intranasal instillation of Cryptococcus neoformans. Based on these data, R146225 may be useful in the therapy of eosinophil-driven allergic conditions.
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Affiliation(s)
- J Van Wauwe
- Janssen Research Foundation, Beerse, Belgium.
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30
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Stoppie P, Borgers M, Borghgraef P, Dillen L, Goossens J, Sanz G, Szel H, Van Hove C, Van Nyen G, Nobels G, Vanden Bossche H, Venet M, Willemsens G, Van Wauwe J. R115866 inhibits all-trans-retinoic acid metabolism and exerts retinoidal effects in rodents. J Pharmacol Exp Ther 2000; 293:304-12. [PMID: 10734183] [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: 02/15/2023] Open
Abstract
All-trans-retinoic acid (RA) regulates epithelial differentiation and growth through activation of specific nuclear RA receptors (RARs). Because high-rate metabolism largely impairs the biological efficacy of RA, we have sought for compounds capable of inhibiting the metabolic breakdown of the retinoid. This study identifies R115866 as a novel inhibitor of the cytochrome P450 (CYP)-mediated metabolism of RA. In vitro, nanomolar concentrations of R115866 inhibited the conversion of RA by CYP26, a RA-inducible RA metabolizing enzyme. In vivo, oral administration of R115866 (2.5 mg/kg) to rats induced marked and transient increases of endogenous RA levels in plasma, skin, fat, kidney, and testis. Consistent with its ability to enhance endogenous RA content in tissues, R115866 was found to exert retinoidal activities. Like RA, the title compound: 1) inhibited vaginal keratinization in estrogen-stimulated rats; 2) induced epidermal hyperplasia in mouse ear skin; 3) transformed mouse tail epidermis from a para- to an orthokeratotic skin type; and 4) up-regulated the CYP26 mRNA expression in rat liver. Furthermore, we found that the keratinization-suppressive and CYP26-inducing activities of R115866 could be reversed by concomitant administration of the RAR antagonist, AGN193109. Our data characterize R115866 as a potent, orally active inhibitor of RA metabolism, capable of enhancing RA levels and displaying retinoidal actions. These activities are reversed by RAR antagonism, supporting the idea that the actions of R115866 result from increased availability of endogenous RA and improved RAR triggering.
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Affiliation(s)
- P Stoppie
- Janssen Research Foundation, Beerse, Belgium
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31
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Hatzelmann A, Goossens J, Fruchtmann R, Mohrs KH, Raddatz S, Müller-Peddinghaus R. Inversely-correlated inhibition of human 5-lipoxygenase activity by BAY X1005 and other quinoline derivatives in intact cells and a cell-free system--implications for the function of 5-lipoxygenase activating protein. Biochem Pharmacol 1994; 47:2259-68. [PMID: 8031320 DOI: 10.1016/0006-2952(94)90264-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A series of quinoline derivatives were analysed for the influence on leukotriene synthesis as a parameter for 5-LOX (EC 1.13.11.34) activity in a cell-free system of the 10,000 g supernatant of human PMNL (polymorphonuclear leukocytes). The ratios of the IC50 values for leukotriene synthesis inhibition in this cell-free system and in A23187-stimulated intact PMNL ranged from 1-1100. Consequently, plotting of the two values resulted in a random distribution (r = -0.281, N = 18) suggesting that no relationship between the inhibition of leukotriene synthesis in the cell-free system and in intact cells exists. At first sight this finding was not surprising since we have shown earlier that in intact cells this class of quinoline derivatives shares the same mode of action as MK-886, i.e. an indirect inhibition of 5-LOX activity by binding to FLAP. However, we found that the potency of these compounds in intact cells is strongly influenced by the K value (partition coefficient) which is a parameter for the ability of a substance to accumulate in a lipid (membrane) phase compared to the water phase. Therefore, the IC50 values for leukotriene synthesis inhibition in intact PMNL were corrected for the corresponding K value of the compounds and the resulting values again plotted against the IC50 values for inhibition of leukotriene synthesis in the cell-free system. As a result, a significant correlation (r = -0.878, N = 18) was obtained. In order to simplify this relationship the influence of the partition coefficient was eliminated by comparing compounds with about the same K value (K = 7243 +/- 1646, N = 7). As a result, the IC50 values for inhibition of leukotriene synthesis in the 10,000 g supernatant fraction (indicative for the affinity of the compounds to 5-LOX) and in intact cells (indicative for the affinity of the compounds to FLAP) were highly, but inversely correlated (r = -0.992). That means that a compound with a high affinity to 5-LOX will have a low affinity to FLAP and vice versa. We hypothesized that this pharmacologically obtained relationship could be indicative of a physiologically occurring equivalent. We therefore propose a model in which FLAP binds arachidonic acid as its physiological substrate with low affinity and allows 5-LOX to get access to its substrate (assuming a higher affinity of 5-LOX to arachidonic acid) after 5-LOX translocation from the cytosol to the membrane.(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- A Hatzelmann
- Bayer AG, Pharma Research Center, Wuppertail, F.R.G
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Van Wauwe J, Coene MC, Cools W, Goossens J, Lauwers W, Le Jeune L, Van Hove C, Van Nyen G. Liarozole fumarate inhibits the metabolism of 4-keto-all-trans-retinoic acid. Biochem Pharmacol 1994; 47:737-41. [PMID: 8129749 DOI: 10.1016/0006-2952(94)90137-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The metabolism of 4-keto-all-trans-retinoic-acid (4-keto-RA), a biologically active oxygenated metabolite of all-trans-retinoic (RA), has been examined. In vitro, incubation of [14C]4-keto-RA with hamster liver microsomes in the presence of NADPH produced two major radioactive metabolites which were more polar than the parent compound. Following isolation, appropriate derivatization and analysis by GC-MS, these compounds were tentatively identified as 2-hydroxy- and 3-hydroxy-4-ketoretinoic acid. Formation of both hydroxy-keto derivatives was suppressed by the imidazole-containing P450 inhibitor liarozole fumarate (IC50, 1.3 microM). In vitro, an i.v. injection of 4-keto-RA (20 micrograms) into rats was followed by rapid disappearance of the retinoid from plasma with a half-life of 7 min. Pretreatment with liarozole fumarate (40 mg/kg, -60 min) reduced the elimination rate of 4-keto-RA: it prolonged the plasma half-life of the retinoid to 12 min, without affecting its distribution volume. These results indicate the important role of the P450 enzyme system in the metabolism of 4-keto-RA both in vitro and in vivo. The inhibitory effect of liarozole fumarate on this metabolic process may contribute to the reported retinoid-mimetic activity of this drug.
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Affiliation(s)
- J Van Wauwe
- Janssen Research Foundation, Beerse, Belgium
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33
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Goossens J. A mathematical correction method for spectral interferences on selenium in inductively coupled plasma mass spectrometry. Talanta 1994; 41:187-93. [DOI: 10.1016/0039-9140(94)80106-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/1993] [Revised: 08/19/1993] [Accepted: 08/19/1993] [Indexed: 10/18/2022]
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Goossens J, Vanhaecke F, Moens L, Dams R. Elimination of interferences in the determination of arsenic and selenium in biological samples by inductively coupled plasma mass spectrometry. Anal Chim Acta 1993. [DOI: 10.1016/0003-2670(93)80251-f] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Vanhaecke F, Goossens J, Dams R, Vandecasteele C. The determination of molybdenum in a sea water candidate reference material by inductively coupled plasma-mass spectrometry. Talanta 1993; 40:975-9. [DOI: 10.1016/0039-9140(93)80153-i] [Citation(s) in RCA: 4] [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] [Received: 11/26/1992] [Revised: 01/12/1993] [Accepted: 01/12/1993] [Indexed: 10/18/2022]
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Van Wauwe J, Van Nyen G, Coene MC, Stoppie P, Cools W, Goossens J, Borghgraef P, Janssen PA. Liarozole, an inhibitor of retinoic acid metabolism, exerts retinoid-mimetic effects in vivo. J Pharmacol Exp Ther 1992; 261:773-9. [PMID: 1374473] [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: 12/26/2022] Open
Abstract
Liarozole is an imidazole-containing compound that inhibits the cytochrome P-450-dependent metabolism of all-trans-retinoic acid (RA). In vitro, liarozole (IC50, 2.2 microM) suppressed the P-450-mediated conversion of RA to more polar metabolites by hamster liver microsomes. In vivo, it enhanced the plasma level of RA from mostly undetectable values (less than 0.5 ng/ml) in control rats to 1.4 +/- 0.1 and 2.9 +/- 0.1 ng/ml in animals treated p.o. with 5 and 20 mg/kg of liarozole, respectively. Moreover, liarozole possessed antikeratinizing activity: when dosed subchronically (5-20 mg/kg, once daily for 3 days) to ovariectomized rats, the compound reversed the vaginal keratinization induced in these animals by estrogenic stimulation. Dose response experiments indicated that the antikeratinizating effect of liarozole was as potent as that of RA. One-dimensional electrophoresis and immunoblotting of extracted vaginal epithelia showed that liarozole shared with RA the ability to inhibit the synthesis of high molecular weight (57-60 kDa) keratin proteins, and to enhance the expression of the 45 to 47 kDa keratin polypeptides. Furthermore, we found that antikeratinizing doses of liarozole doubled the RA concentration in the vagina of ovariectomized rats: the mean amount of RA extracted from 200 mg of vaginal tissue was increased from 1.1 +/- 0.1 ng in vehicle-treated animals to 2.2 +/- 0.2 and 2.6 +/- 0.2 ng after treatment with 5 and 20 mg/kg of liarozole, respectively. These findings indicate that liarozole, an inhibitor of RA metabolism and RA produce similar morphologic and biochemical effects on the differentiation process of rat vaginal epithelium.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J Van Wauwe
- Janssen Research Foundation, Beerse, Belgium
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Van Wauwe JP, Coene MC, Goossens J, Cools W, Monbaliu J. Effects of cytochrome P-450 inhibitors on the in vivo metabolism of all-trans-retinoic acid in rats. J Pharmacol Exp Ther 1990; 252:365-9. [PMID: 2299598] [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: 12/31/2022] Open
Abstract
This study examines the effects of ketoconazole, R 75 251 and some other cytochrome P-450 inhibitors on the in vivo metabolism of all-trans-retinoic acid (RA) in normal rats. Oral treatment with ketoconazole or R 75 251 (40 mg/kg, -1 hr) reduced the elimination rate of i.v. injected RA from plasma: the half-life of RA increased from 27 min in control-treated animals to 43 min and 76 min after dosing with ketoconazole and R 75 251, respectively. However, neither drug had an effect on the distribution volume of the retinoid. Two hours after i.v. injection of RA, residual plasma levels of the retinoid were 11.2 ng/ml in ketoconazole and 22.7 ng/ml in R 75 251-treated rats. The other P-450 inhibitors, aminoglutethimide, cimetidine, itraconazole, metyrapone and saperconazole, showed no sparing effect on RA elimination: plasma levels of the acid were below 1 ng/ml, as in control-treated animals. Administration of ketoconazole or R 75 251 (40 mg/kg, -2 hr) to rats also enhanced endogenous plasma concentrations of RA. Levels of the retinoid were raised from mostly undetectable values (less than 0.5 ng/ml) to 1.3 +/- 0.1 and 2.5 0.1 ng/ml after treatment with ketoconazole and R 75 251, respectively. These data are indicative of the important contribution of the cytochrome P-450 enzyme system to the in vivo metabolic process of RA. In vivo inhibition of the P-450 pathway not only increased the biological half-life of exogenously administered RA, but also enhanced the endogenous plasma level of this vitamin A derivative.
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Van Wauwe JP, Coene MC, Goossens J, Van Nijen G, Cools W, Lauwers W. Ketoconazole inhibits the in vitro and in vivo metabolism of all-trans-retinoic acid. J Pharmacol Exp Ther 1988; 245:718-22. [PMID: 3367313] [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: 01/05/2023] Open
Abstract
Ketoconazole, an antifungal agent and inhibitor of certain mammalian cytochrome P-450-dependent enzymes, was studied for its effects on the in vitro and in vivo metabolism of all-trans-retinoic acid (RA). In vitro, ketoconazole (Ki = 0.75 microM) inhibited, in an apparently competitive manner, the cytochrome P-450-mediated metabolism to 4-hydroxy- and 4-keto-retinoic acids by hamster liver microsomes. In vivo, ketoconazole suppressed the formation of polar RA metabolites by normal rats dosed intrajugularly with 200 ng of [3H]RA. After p.o. treatment with ketoconazole (2.5-40 mg/kg) given 1 hr before the [3H]RA injection, the radioactivity extracted from the liver consisted of 25 to 50% polar metabolites (control 66 +/- 1%) and 50 to 75% undegraded RA (control 34 +/- 1%) as evidenced by reverse-phase high-performance liquid chromatography. Time course experiments showed that ketoconazole's inhibitory effects lasted for 3 hr. Our data indicate the quantitative importance of the cytochrome P-450 enzymatic pathway in the biotransformation of RA. They also suggest that ketoconazole is capable of prolonging the biological half-life of RA and of improving the tissue levels of this compound.
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Affiliation(s)
- J P Van Wauwe
- Life Sciences Department, Janssen Research Foundation, Beerse, Belgium
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Abstract
Praziquantel induces a bilayer to isotropic transition in the absence of Ca2+ in a mixed phospholipid membrane consisting of phosphatidylethanolamine (PE) and phosphatidylserine (PS) at a molar ratio of 2:1 at 25 degrees C or 35 degrees C, irrespective of the lipid/drug molar ratio (10:1; 2:1). Addition of Ca2+ at different PS/Ca2+ molar ratios (4:1, 2:1 or 1:1) leads to a transition to a hexagonal (HII) state. With a phospholipid membrane of different composition (PE/PS molar ratio 4:1) praziquantel exerts quite different effects in the presence of Ca2+ (PS/Ca2+ molar ratio 1:1). An isotropic-signal appears together with a bilayer one at 25 degrees C, while a HII-signal can be detected at 35 degrees C. Thus, two separate phases coexist at this PE/PS molar ratio, while at a PE/PS molar ratio of 2:1, praziquantel and Ca2+ induce only a HII-signal. The results with these model membranes show that praziquantel and Ca2+ exert drastic influences on bilayer-isotropic-hexagonal transitions. The possibility that this drug might act in the schistosomal tegumental membranes in the same way is discussed.
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Affiliation(s)
- A Harder
- Bayer AG, Institut für Parasitologie, Bayerwerk, F.R.G
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Abstract
The cytoprotective effects of the anti-asthmatic drug, disodium cromoglycate (DSCG), on gastric mucosal necrosis induced by ethanol in rats were studied. Subcutaneous, but not oral, DSCG prevented the formation of gastric lesions and this effect was dose-dependent between 1.25 and 40 mg kg-1, with an ED50 value of 6.8 mg kg-1. Maximal cytoprotection occurred 15-30 min after DSCG treatment. Histological examination revealed that DSCG effectively protected the gastric mucosa against ethanol-induced vascular congestion, haemorrhage, epithelial desquamation and mucosal oedema. Enhanced production of endogenous prostaglandins, which are known cytoprotective compounds, could not explain the mucosal protection. At a dose of 40 mg kg-1, DSCG did not change prostaglandin E2 or 6-keto-prostaglandin F1 alpha concentrations in gastric mucosal tissue, although its cytoprotective activity was partially inhibited by prior treatment of the animals with indomethacin.
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Van Wauwe JP, Goossens J, Van Nyen G. Inhibition of lymphocyte proliferation by monoclonal antibody directed against the T3 antigen on human T cells. Cell Immunol 1984; 86:525-34. [PMID: 6234071 DOI: 10.1016/0008-8749(84)90408-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Peripheral blood mononuclear cells from 40% of normal donors are mitogenically unresponsive to UCHT1, a monoclonal antibody reactive to the T3 surface molecule on human T lymphocytes. Cell preparations from non-UCHT1 responders were used to examine whether and how interaction of UCHT1 with the T3 molecule affects T-cell functionality. It was found that UCHT1 profoundly (greater than 85%) suppressed lymphocyte proliferation induced by plant mitogens (phytohemagglutinin (PHA) and concanavalin A (Con A], recall antigen (candidin), and allogeneic non-T cells. The antibody abrogated both the production of interleukin 2 (IL-2) by and the expression of IL-2-specific receptors on T lymphocytes stimulated by PHA or allogeneic non-T cells. UCHT1 was maximally suppressive when added to cells within 2 hr (PHA stimulation) or 1 day (allogeneic non-T cell activation) after the initiation of the culture period. The inhibiting activity of UCHT1 could be related to its ability to modulate T3 molecules from the T-cell surface: both actions displayed the same antibody concentration dependence and had a comparable time dependence. Moreover, after modulation, unresponsive lymphocytes regained responsiveness to PHA in parallel with reexpression of surface T3 molecules. These findings are consistent with the idea that the human T3 molecule functions as an essential signal transducer during the early phases of T-cell activation.
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Van Wauwe J, Goossens J. Effects of antioxidants on cyclooxygenase and lipoxygenase activities in intact human platelets: comparison with indomethacin and ETYA. Prostaglandins 1983; 26:725-30. [PMID: 6422509 DOI: 10.1016/0090-6980(83)90057-6] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Five antioxidative agents (BW755C, 1-naphtol, NDGA, propylgallate and quercetin) were compared with indomethacin and ETYA for their effects on (14C) arachidonic acid metabolism by cyclooxygenase (CO) and lipoxygenase (LPO) enzymes in intact human platelets. All tested compounds inhibited CO activity in a concentration-dependent manner. LPO activity was suppressed by NDGA, propylgallate, quercetin and ETYA but strongly enhanced by BW755C, 1-naphtol and indomethacin. Whereas NDGA and ETYA showed almost equi-potent inhibitory effects towards both fatty acid oxygenases, propylgallate and quercetin were found to be respectively 6.5 and 4 times better inhibitors of LPO than of CO activities. These data indicate that antioxidants affect arachidonic acid metabolism in intact human platelets in different ways: BW755C and 1-naphtol exerted the same activity as indomethacin, a selective CO blocker, whereas NDGA, propylgallate and quercetin behaved as ETYA, a dual CO-LPO inhibitor. Considering their inhibition selectivity, propylgallate and quercetin may serve as prototypes for more specific blockers of LPO activity.
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Van Wauwe J, Goossens J, Decock W, Kung P, Goldstein G. Suppression of human T-cell mitogenesis and E-rosette formation by the monoclonal antibody OKT11A. Immunol Suppl 1981; 44:865-71. [PMID: 6976312 PMCID: PMC1554993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
OKT11A, a monoclonal anti-human T-cell antibody was studied for its in vitro effects on lymphocyte functions. At a concentration as low as 10 ng/ml, OKT11A significantly suppressed T-cell proliferation induced by OKT3, purified protein derivative (PPD), tetanus toxoid and allogeneic non-T cells. Total inhibition of proliferation was noticed at concentrations of 1-10 microgram OKT11A/ml. The antibody was only fully effective when added to stimulated cell cultures within the first 2 hr of the culturing period. OKT11A also blocked total and active sheep erythrocyte (E)-rosette formation by T lymphocytes: this activity closely paralleled the suppression of proliferative response. Quantitative studies on the binding of 125I-labelled IKT11A indicated that an average of 2 x 10(4) antibody molecules were bound per T cell. Taken together, these findings show that OKT11A recognizes a sparsely represented T-cell surface determinant that is associated with the inhibition of mitogenic responsiveness and E-rosette formation. Furthermore, our data imply that the E-rosette receptor of T cells is involved in the regulation of immune functions.
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Van Wauwe J, Goossens J. Mitogenic actions of Orthoclone OKT3 on human peripheral blood lymphocytes: effects of monocytes and serum components. Int J Immunopharmacol 1981; 3:203-8. [PMID: 7287264 DOI: 10.1016/0192-0561(81)90014-x] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The Orthoclone monoclonal antihuman T lymphocyte antibody, OKT3, induced maximal DNA, RNA and protein synthesis in peripheral mononuclear blood cells (PMBC) at concentrations as low as 10 ng ml-1. This pronounced mitogenic activity was highly dependent on the presence of monocytes: removal of these cells from PMBC suspensions by complement (C)-dependent lysis with the antimonocyte antibody OKM1, completely abrogated the proliferative responsiveness of the remaining lymphocytes. The addition of adherent cells to OKM1-treated PMBC demonstrated the strict monocyte requirement for the mitogenic activity of OKT3. Mitogenic responses to OKT3 were most marked when PMBC were cultured in media containing heat-inactivated fetal calf serum (FCS) but they were considerably weaker in cultures supplemented with heat-inactivated human serum (HS). Moreover, aggregated human IgG and its Fc fragments (but not monomeric IgG and its Fab fragments) inhibited the mitogenicity of OKT3: their inhibition could be explained by stimulation of monocytes, resulting in increased prostaglandin E release, since (a) prostaglandin E2 itself strongly suppressed OKT3 activity and (b) indomethacin blocked the inhibitory effects of aggregated HuIgG. The present data demonstrate that OKT3 shows a particular pattern of mitogenicity: the strict monocyte requirement, the inhibitory effects of HS, aggregated human IgG and prostaglandin E2 were not observed for the phytomitogen PHA.
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Van Wauwe J, Goossens J. Monoclonal anti-human T-lymphocyte antibodies: enumeration and characterization of T-cell subsets. Immunology 1981; 42:157-64. [PMID: 6970173 PMCID: PMC1458216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The complement-mediated lysis of human lymphocytes by three monoclonal anti-human T-cell antibodies OKT3.PAN, OKT4.INd and OKT8.SUP was studied. The percentages of Ficoll-Hypaque-isolated mononuclear cells lysed by these antibodies were respectively: 65% for OKT3.PAN, 39% for OKT4.IND and 20% for OKT8.SUP. Optimal lymphocytotoxic reactions were noticed when unabsorbed rabbit serum was used as the source of complement (C). Addition of heat-inactivated human, mouse and newborn calf sera but not of foetal calf serum inhibited the lytic activity of the antibodies. Treatment of peripheral mononuclear blood cells with OKT3.PAN and C abrogated their mitotic response to PHA and Con-A. Sheep erythrocyte rosetting lymphocytes (E+ cells) treated with OKT4.IND or OKT8.SUP and C exhibited no marked changes in responsiveness to PHA, Con-A or allogeneic non-T cells. However, only E+ cells enriched with OKT4.IND-reactive cells responded to purified protein derivative, proliferated in the autologous mixed lymphocyte reaction and were highly sensitive to hydrocortisone suppression when stimulated by PHA. Our data indicate that these monoclonal antibodies can be regarded as invaluable tools for enumeration, characterization and functional assessment of human T cells and their subclasses.
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Anhoury ML, Arickx M, Boon B, Crooy P, de Neys R, Dewez M, Gilles D, Goossens J, Liveyns R, Roelants P. Analysis of a bivalent meningococcal vaccine (A + C). Part I. Analytical and safety data. Ann Soc Belg Med Trop 1979; 59:259-66. [PMID: 117760] [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: 12/13/2022]
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Van Wauwe J, Goossens J. The effects of antioxidants on the stimulation of mouse thymocytes by concanavalin A. Int J Immunopharmacol 1979; 1:233-7. [PMID: 551968 DOI: 10.1016/0192-0561(79)90047-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Clerck FD, Goossens J, Beerens M. Lack of platelet factor-3 activation after incubation of platelet-rich plasma with kaolin in the rat. Experientia 1976; 32:1602-3. [PMID: 1021463 DOI: 10.1007/bf01924476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Stypven times, measured in rat platelet-rich plasma (P.R.P.) after incubation with kaolin, did not shorten as incubation proceeded, thus reflecting the lack of development of platelet factor-3 (PF3) availability in this test system. Repeated freezing and thawing of P.R.P. or aggregation with collegan did result in PF-3 availability. Aggregation and PF-3 availability were inhibited by the compound VK774. These findings add another aspect to the list of species differences in platelet function.
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