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Klein Klouwenberg PMC, Altorf–van der Kuil W, van Griethuysen AJ, Hendriks M, Kuijper EJ, Notermans DW, Schoffelen AF. False aminoglycoside resistance in Enterobacterales and non-fermenters by an automated testing system: a descriptive study. Microbiol Spectr 2023; 11:e0309323. [PMID: 38194628 PMCID: PMC10790582 DOI: 10.1128/spectrum.03093-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Accepted: 10/03/2023] [Indexed: 01/11/2024] Open
Abstract
IMPORTANCE Antimicrobial sensitivity data are important to guide antimicrobial therapy. In microbiological laboratories, routine sensitivity measurements are typically performed with automated testing systems such as VITEK2 and Phoenix. Using data from the Dutch national surveillance system for antimicrobial resistance over a 6-year period, we found that the measured minimum inhibitory concentrations for aminoglycosides in Enterobacterales and non-fermenters were too high for the Phoenix system. In addition, we observed a yearly increase in resistance for several species measured by Phoenix. These findings might have consequences for clinical treatment of patients with sepsis.
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Affiliation(s)
| | - W. Altorf–van der Kuil
- Centre for Infectious Disease Control (CIb), National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands
| | | | - M. Hendriks
- Department of Medical Microbiology, Gelderse Vallei Hospital, Ede, the Netherlands
| | - E. J. Kuijper
- Centre for Infectious Disease Control (CIb), National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands
| | - D. W. Notermans
- Centre for Infectious Disease Control (CIb), National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands
| | - A. F. Schoffelen
- Centre for Infectious Disease Control (CIb), National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands
| | - on behalf of the ISIS-AR study groupCohen StuartJ.W.T.1MellesD.C.2van DijkK.3AlzubaidyA.4ScholingM.5KuilS.D.6BlaauwG.J.7Altorf–van der KuilW.8BiermanS.M.8de GreeffS.C.8GroenendijkS.R.8HertroysR.8MarchalN.8MonenJ.C.M.8PolmanJ.8van den ReekW.J.8Schneeberger–van der LindenC.8SchoffelenA.F.8WieldersC.C.H.8de WitB.J.8ZoetigheidR.E.8van den BijllaardtW.9KraanE.M.10HaesekerM.B.11da SilvaJ.M.12de JongE.13MarahaB.14van GriethuysenA.J.15WintermansB.B.16van TrijpM.J.C.A.17MullerA.E.18WongM.19OttA.20BathoornE.21LokateM.21SinnigeJ.22MellesD.C.23RendersN.H.24Dorigo–ZetsmaJ.W.25BakkerL.J.25WaarK.26van der BeekM.T.27Leversteijn–van HallM.A.28van MensS.P.29SchaftenaarE.30Nabuurs–FranssenM.H.31MaatI.32SturmP.D.J.33DiederenB.M.W.34BodeL.G.M.35OngD.S.Y.36van RijnM.37PontesilliO.37DinantS.38van DamD.W.39de BrauwerE.I.G.B.39BentvelsenR.G.4041BuitingA.G.M.42VlekA.L.M.43de GraafM.44TroelstraA.45JanszA.R.46van MeerM.P.A.47de VriesJ.48MachielsJ.49Department of Medical Microbiology, Noordwest Ziekenhuisgroep, Alkmaar, the NetherlandsDepartment of Medical Microbiology, Meander Medical Center, Amersfoort, the NetherlandsDepartment of Medical Microbiology and Infection Prevention, Amsterdam UMC, University of Amsterdam, Amsterdam Infection and Immunity Institute, Amsterdam, the NetherlandsDepartment of Medical Microbiology, Atalmedial, Amsterdam, the NetherlandsDepartment of Medical Microbiology, OLVG Lab BV, Amsterdam, the NetherlandsPublic Health Service, Public Health Laboratory, Amsterdam, the NetherlandsDepartment of Medical Microbiology and Infection Prevention, Gelre Hospitals, Apeldoorn, the NetherlandsCentre for Infectious Disease Control (CIb), National Institute for Public Health and the Environment (RIVM), Bilthoven, the NetherlandsMicrovida Amphia, Laboratory for Microbiology and Infection Control, Breda, the NetherlandsDepartment of Medical Microbiology, IJsselland Hospital, Capelle aan den IJssel, the NetherlandsDepartment of Medical Microbiology, Haeseker, Reinier de Graaf Group, Delft, the NetherlandsDepartment of Medical Microbiology, Deventer Hospital, Deventer, the NetherlandsDepartment of Medical Microbiology, Slingeland Hospital, Doetinchem, the NetherlandsDepartment of Medical Microbiology, Albert Schweitzer Hospital, Dordrecht, the NetherlandsDepartment of Medical Microbiology, Gelderse Vallei Hospital, Ede, the NetherlandsDepartment of Medical Microbiology, Admiraal De Ruyter Hospital, Goes, the NetherlandsDepartment of Medical Microbiology and Infection Prevention, Groene Hart Hospital, Gouda, the NetherlandsDepartment of Medical Microbiology, Haaglanden MC, 's-Gravenhage, the NetherlandsDepartment of Medical Microbiology, Haga Hospital, 's-Gravenhage, the NetherlandsCerte, Medical Microbiology Groningen|Drenthe, Groningen, the NetherlandsDepartment of Medical Microbiology, University of Groningen, University Medical Center, Groningen, the NetherlandsRegional Public Health Laboratory Haarlem, Haarlem, the NetherlandsDepartment of Medical Microbiology, St Jansdal Hospital, Harderwijk, the NetherlandsDepartment of Medical Microbiology and Infection Control, Jeroen Bosch Hospital, 's-Hertogenbosch, the NetherlandsDepartment of Medical Microbiology, CBSL, Tergooi MC, Hilversum, the NetherlandsCerte, Medical Microbiology Friesland|NOP, Leeuwarden, the NetherlandsDepartment of Medical Microbiology, Leiden University Medical Center, Leiden, the NetherlandsDepartment of Medical Microbiology, Eurofins Clinical Diagnostics, Leiden-Leiderdorp, the NetherlandsDepartment of Medical Microbiology, Maastricht University Medical Centre, Maastricht, the NetherlandsDepartment of Medical Microbiology and Immunology, St Antonius Hospital, Nieuwegein, the NetherlandsDepartment of Medical Microbiology and Infectious Diseases, Canisius Wilhelmina Hospital, Nijmegen, the NetherlandsDepartment of Medical Microbiology, Radboud University Medical Center, Nijmegen, the NetherlandsLaurentius Hospital, Roermond, the NetherlandsDepartment of Medical Microbiology, Bravis Hospital, Roosendaal, the NetherlandsDepartment of Medical Microbiology and Infectious Diseases, Erasmus University Medical Center, Rotterdam, the NetherlandsDepartment of Medical Microbiology and Infection Control, Franciscus Gasthuis and Vlietland, Rotterdam, the NetherlandsDepartment of Medical Microbiology, Ikazia Hospital, Rotterdam, the NetherlandsStar-SHL, Rotterdam, the NetherlandsDepartment of Medical Microbiology and Infection Control, Zuyderland Medical Centre, Sittard-Geleen, the NetherlandsDepartment of Medical Microbiology, Microvida ZorgSaam, Terneuzen, the NetherlandsDepartment of Medical Microbiology, Microvida ZorgSaam, Terneuzen, the NetherlandsDepartment of Medical Microbiology, St. Elisabeth Hospital, Tilburg, the NetherlandsDepartment of Medical Microbiology and Immunology, Diakonessenhuis, Utrecht, the NetherlandsDepartment of Medical Microbiology, Saltro Diagnostic Centre, Utrecht, the NetherlandsDepartment of Medical Microbiology, University Medical Center Utrecht, Utrecht, the NetherlandsDepartment of Medical Microbiology, Eurofins-PAMM, Veldhoven, the NetherlandsRijnstate Hospital, Laboratory for Medical Microbiology and Immunology, Velp, the NetherlandsDepartment of Medical Microbiology, VieCuri Medical Center, Venlo, the NetherlandsIsala Hospital, Laboratory of Medical Microbiology and Infectious Diseases, Zwolle, the Netherlands
- Department of pharmacy, Fundashon Mariadal, Kralendijk, Bonaire, the Netherlands
- Centre for Infectious Disease Control (CIb), National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands
- Department of Medical Microbiology, Gelderse Vallei Hospital, Ede, the Netherlands
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Dijkstra E, Hospers G, van de Velde C, Fleer J, Bahadoer R, Guren M, Tjalma J, Putter H, Meershoek-Klein Kranenbarg E, Roodvoets A, ten Tije A, Capdevila J, Hendriks M, Cervantes A, Nilsson P, Glimelius B, van Etten B, Marijnen C. OC-0337 Quality of life, functional outcome and late toxicity in patients treated within the RAPIDO trial. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06870-5] [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: 11/15/2022]
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Schomaker J, Grouls MME, van der Linden CGM, Rau EM, Hendriks M, Colon A, Meeter M. Novelty processing depends on medial temporal lobe structures. Neurobiol Learn Mem 2021; 183:107464. [PMID: 34015438 DOI: 10.1016/j.nlm.2021.107464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 03/02/2021] [Accepted: 05/12/2021] [Indexed: 11/30/2022]
Abstract
OBJECTIVES The goal of the present study was to identify the role of the medial temporal lobe (MTL) in the detection and later processing of novelty. METHODS Twenty-one epilepsy patients with unilateral MTL resection (10 left-sided; 11 right-sided) and 26 matched healthy controls performed an adapted visual novelty oddball task. In this task two streams of stimuli were presented on the left and right of fixation while the patients' electroencephalogram was measured. The participants had to respond to infrequent target stimuli, while ignoring frequent standard, and infrequent novel stimuli that were presented to the left or right, appearing either contra- or ipsilateral to the patients' resections. RESULTS Novelty detection, as indexed by the N2 ERP component elicited by novels, was reduced by the MTL resections, as evidenced by a smaller N2 for patients than healthy controls. Later processing of novels, as indexed by the novelty P3 ERP component, was reduced for novels presented contra- versus ipsilateral to the resected side. Moreover, at a frontal electrode site, the N2-P3 complex showed reduced novelty processing in patients with MTL resections compared to healthy controls. The ERP differences were specific for the novel stimuli, as target processing, as indexed by the P3b, was unaffected in the patients: No P3b differences were found between targets presented ipsi- or contralaterally to the resected side, nor between patients and healthy controls. CONCLUSIONS The current results suggest that MTL structures play a role in novelty processing. In contrast, target processing was unaffected by MTL resections.
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Affiliation(s)
- J Schomaker
- Faculty of Social Sciences, Leiden University, the Netherlands.
| | - M M E Grouls
- GGZ Altrecht, Vesalius Centre for Neuropsychiatry, Woerden, the Netherlands
| | | | - E M Rau
- Department of Psychology, Ruhr University, Bochum, Germany
| | - M Hendriks
- Academic Centre for Epileptology, Kempenhaeghe, Heeze, the Netherlands; Donders Institute for Brain, Cognition, and Behaviour, Radboud University, Nijmegen, the Netherlands
| | - A Colon
- Academic Centre for Epileptology, Kempenhaeghe, Heeze, the Netherlands
| | - M Meeter
- Department of Education, VU University, Amsterdam, the Netherlands
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Hendriks M, Bartolo S, Constans B, Gonzalez M, Tavernier B, Garabedian C, Subtil D. [Factors related to severe neonatal acidosis in planned cesarean section. A case-control study]. ACTA ACUST UNITED AC 2020; 48:784-789. [PMID: 32417399 DOI: 10.1016/j.gofs.2020.05.005] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Indexed: 11/17/2022]
Abstract
OBJECTIVES To identify factors related to the occurrence of severe neonatal acidosis in case of planned caesarean section. METHODS Case-control study conducted between 1997 and 2016 among women with planned caesarean delivery at term. Cases were women whose neonates had neonatal arterial pH<7,0. For each case, two planned caesarean sections with neonatal pH≥7,0 were selected as controls. Women whose fetus had a congenital malformation and those whose anesthesia was not spinal anesthesia were excluded. RESULTS Among the 5014 planned cesarean sections of the study period, 38 severe neonatal acidosis were observed (incidence of 0,76% CI95 [0,54-1,04]). Compared to 72 controls, the 36 caesareans with severe neonatal acidosis were associated with more frequent maternal obesity (BMI≥30kg/m2), higher ephedrine doses, longer time from skin incision to infant delivery, and more extraction difficulties. After logistic regression, only maternal obesity remained associated with a significant increase in the risk of severe neonatal acidosis, ORa=3,73, 95%CI (1,11-12,56). CONCLUSIONS In case of planned cesarean section, the main risk factor for severe neonatal acidosis is the existence of maternal obesity.
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Affiliation(s)
- M Hendriks
- Hôpital Jeanne-de-Flandre, pôle Femme-Mère-Nouveau-né, université de Lille, CHU de Lille, 1, rue Eugène-Avinée, 59000 Lille, France.
| | - S Bartolo
- Hôpital Jeanne-de-Flandre, pôle Femme-Mère-Nouveau-né, université de Lille, CHU de Lille, 1, rue Eugène-Avinée, 59000 Lille, France
| | - B Constans
- Département d'anesthésie réanimation, université de Lille, CHU de Lille, 59000 Lille, France
| | - M Gonzalez
- Département d'anesthésie réanimation, université de Lille, CHU de Lille, 59000 Lille, France
| | - B Tavernier
- Département d'anesthésie réanimation, université de Lille, CHU de Lille, 59000 Lille, France
| | - C Garabedian
- Hôpital Jeanne-de-Flandre, pôle Femme-Mère-Nouveau-né, université de Lille, CHU de Lille, 1, rue Eugène-Avinée, 59000 Lille, France; EA 2694 santé publique, épidémiologie et qualité des soins, université de Lille, 59000 Lille, France; Obstetric Department, Catholic Hospitals, Lille Catholic University, 59000 Lille, France
| | - D Subtil
- Hôpital Jeanne-de-Flandre, pôle Femme-Mère-Nouveau-né, université de Lille, CHU de Lille, 1, rue Eugène-Avinée, 59000 Lille, France; EA 2694 santé publique, épidémiologie et qualité des soins, université de Lille, 59000 Lille, France; Obstetric Department, Catholic Hospitals, Lille Catholic University, 59000 Lille, France
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Hendriks M, de Cock E, Maplestone K, Namini H, van Elsas A. Phase I safety and pharmacokinetics of ADU-1604, an anti-CTLA-4 antibody, in adults with metastatic melanoma. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy487.038] [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: 11/14/2022] Open
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Marabelle A, Andtbacka R, Harrington K, Melero I, Leidner R, de Baere T, Robert C, Ascierto PA, Baurain JF, Imperiale M, Rahimian S, Tersago D, Klumper E, Hendriks M, Kumar R, Stern M, Öhrling K, Massacesi C, Tchakov I, Tse A, Douillard JY, Tabernero J, Haanen J, Brody J. Starting the fight in the tumor: expert recommendations for the development of human intratumoral immunotherapy (HIT-IT). Ann Oncol 2018; 29:2163-2174. [PMID: 30295695 PMCID: PMC6290929 DOI: 10.1093/annonc/mdy423] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [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] [Indexed: 01/15/2023] Open
Abstract
A European Society for Medical Oncology (ESMO)-sponsored expert meeting was held in Paris on 8 March 2018 which comprised 11 experts from academia, 11 experts from the pharmaceutical industry and 2 clinicians who were representatives of ESMO. The focus of the meeting was exclusively on the intratumoral injection/delivery of immunostimulatory agents with the aim of harmonizing the standard terms and methodologies used in the reporting of human intratumoral immunotherapy (HIT-IT) clinical trials to ensure quality assurance and avoid a blurring of the data reported from different studies. The goal was to provide a reference document, endorsed by the panel members that could provide guidance to clinical investigators, pharmaceutical companies, ethics committees, independent review boards, patient advocates and the regulatory authorities and promote an increase in the number and quality of HIT-IT clinical trials in the future. Particular emphasis was placed not only on the development of precise definitions to facilitate a better understanding between investigators but also on the importance of systematic serial biopsies as a driver for translational research and the need for the recording and reporting of data, to facilitate a better understanding of the key processes involved.
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Affiliation(s)
- A Marabelle
- Département d'Innovation Thérapeutique et d'Essais Précoces, Gustave Roussy, Université Paris-Saclay, Villejuif, France.
| | - R Andtbacka
- Surgical Oncology Department of Surgery, Huntsman Cancer Institute, University of Utah, Salt Lake City, USA
| | - K Harrington
- The Royal Marsden/The Institute of Cancer Research, National Institute for Health Research Biomedical Centre, London, UK
| | - I Melero
- Clinica Universidad de Navarra and CIBERONC, Pamplona, Spain
| | - R Leidner
- Providence Cancer Center, Earle A. Chiles Research Institute, Portland, USA
| | - T de Baere
- Department of Image Guided Therapy, Gustave Roussy, Université Paris-Saclay, Villejuif
| | - C Robert
- Department of Dermatology, Institute Gustave-Roussy, Paris, France
| | - P A Ascierto
- Istituto Nazionale Tumori IRCCS Fondazione Pascale, Naples, Italy
| | - J-F Baurain
- King Albert II Cancer Institute, Cliniques Universitaires St Luc, Université Catholique de Louvain, Brussels, Belgium
| | | | | | - D Tersago
- Clinical Development, Bioncotech Therapeutics, Madrid, Spain
| | | | - M Hendriks
- Aduro Biotech, Eindhoven, The Netherlands
| | - R Kumar
- MedImmune, LLC, Gaithersburg, USA
| | | | | | - C Massacesi
- Global Product Development Oncology, Pfizer, USA
| | | | - A Tse
- Oncology Early Development, Merck & Co., Inc, Kenilworth, USA
| | | | - J Tabernero
- Medical Oncology Department, Vall d' Hebron University Hospital, Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain
| | - J Haanen
- Division of Medical Oncology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - J Brody
- Division of Hematology and Oncology, Department of Medicine, Icahn School of Medicine at Mount Sinai Hospital, New York, USA
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Göker E, De Roos M, Hendriks M, Van Tilburg M, Dreezen C, Stork-Sloots L, Van Egmond A, Neijenhuis S, Generali D. Chemosensitivity and endocrine sensitivity predicted by combining the 80-gene signature and 70-gene signature in the prospective Neoadjuvant Breast Registry Europe – Symphony Trial (NBREaST II). Eur J Cancer 2018. [DOI: 10.1016/s0959-8049(18)30659-2] [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: 10/17/2022]
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Huang H, Poremski D, Goh YL, Hendriks M, Fung D. Increasing the Continuity of Care between Primary Care Provider and a Psychiatric Hospital in Singapore. East Asian Arch Psychiatry 2017; 27:156-161. [PMID: 29259146] [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: 06/07/2023]
Abstract
INTRODUCTION People who have a mental illness and who are stable on their current treatment may be suitable for follow-up care with a community-based general practitioner. A general practitioner-partnership programme was designed in an institute in Singapore to facilitate the transition to community services. However, the rates of successful referrals were low. METHODS Our study followed the format of a quality improvement project, and used administrative data from April 2014 to June 2016 to gauge the impact of the interventions chosen to improve uptake of referrals. Three potential areas of improvement were found based on interviews with 25 service users. RESULTS During the 11 months of pre-intervention period (April 2014 to February 2015), 64% of potentially suitable service users (152 of 238 referrals) transitioned to community services. Low transition was linked to 3 identified causes and consequently, case managers developed personalised financial counselling for service users, assisted in the application for financial supports, and dispelled misconceptions about service provider inability to treat mental illness. Over the 16 months of intervention period (March 2015 to June 2016), the follow-up rate for referrals rose to 92% (260 / 283 referrals). CONCLUSION Given that financial support entitlements change, it is important for case managers to remain aware of changing policy. Misconceptions of service provider qualifications may have a great impact on service user's willingness to seek services from primary care providers.
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Affiliation(s)
- H Huang
- Institute of Mental Health, Singapore
| | | | - Y L Goh
- Institute of Mental Health, Singapore
| | | | - D Fung
- Institute of Mental Health, Singapore
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Overgaauw A, van der Plas L, Hendriks M, Smorenburg C. Feasibility and outcome of chemotherapy in very elderly patients with metastatic breast cancer. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw365.22] [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: 11/13/2022] Open
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Dierselhuis MP, Spierings E, Drabbels J, Hendriks M, Alaez C, Alberú J, Alvarez MB, Burlingham W, Campos E, Christiaans M, Claas F, Fasano ME, Gerbase-DeLima M, Gervais T, Gorodezky C, Larriba J, Lardy NM, Latinne D, Morales-Buenrostro LE, Moreno MJ, Oguz F, Opelz G, Sergeant R, Tambutti M, Teper S, Tilanus M, Turkmen A, Warrens AN, Weimar W, Goulmy E. Minor H antigen matches and mismatches are equally distributed among recipients with or without complications after HLA identical sibling renal transplantation. ACTA ACUST UNITED AC 2013; 82:312-6. [DOI: 10.1111/tan.12209] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 07/31/2013] [Accepted: 09/06/2013] [Indexed: 11/28/2022]
Affiliation(s)
- M. P. Dierselhuis
- Department of Immunohematology and Blood Transfusion; Leiden University Medical Center; Leiden; The Netherlands
| | - E. Spierings
- Department of Immunology; University Medical Center Utrecht; Utrecht; The Netherlands
| | - J. Drabbels
- Department of Immunohematology and Blood Transfusion; Leiden University Medical Center; Leiden; The Netherlands
| | - M. Hendriks
- Department of Immunohematology and Blood Transfusion; Leiden University Medical Center; Leiden; The Netherlands
| | - C. Alaez
- Department of Immunology & Immunogenetics; Instituto de Diagnostico y Referencia Epidemiologicos; Mexico City; Mexico
| | - J. Alberú
- Department of Transplantation; Instituto Nacional de Ciencias, Médicas y de la Nutrición; Mexico City; Mexico
| | - M. B. Alvarez
- Centro de Inmunología y Genética molecular; Buenos Aires; Argentina
| | - W. Burlingham
- Department of Surgery; University of Wisconsin; Madison; WI; USA
| | - E. Campos
- Universidade Federal de São Paulo and Associação Fundo de Incentivo à Pesquisa; São Paulo; Brazil
| | - M. Christiaans
- Department of Nephrology; Maastricht University Medical Center; Maastricht; The Netherlands
| | - F. Claas
- Department of Immunohematology and Blood Transfusion; Leiden University Medical Center; Leiden; The Netherlands
| | - M. E. Fasano
- Immunologia Trapianti c/o Genetica; Turin; Italy
| | - M. Gerbase-DeLima
- Universidade Federal de São Paulo and Associação Fundo de Incentivo à Pesquisa; São Paulo; Brazil
| | - T. Gervais
- Immunohaematology, Cliniques St. Luc; Université Catholique de Louvain; Brussels; Belgium
| | - C. Gorodezky
- Department of Immunology & Immunogenetics; Instituto de Diagnostico y Referencia Epidemiologicos; Mexico City; Mexico
| | - J. Larriba
- Histocompatibility and Immunogenetics-ICBME; Hospital Italiano de Buenos Aires; Buenos Aires; Argentina
| | - N. M. Lardy
- Sanquin-Diagnostic Services; Amsterdam; The Netherlands
| | - D. Latinne
- Immunohaematology, Cliniques St. Luc; Université Catholique de Louvain; Brussels; Belgium
| | - L.-E. Morales-Buenrostro
- Department of Nephrology and Mineral Metabolism; Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubiran; México City; Mexico
| | - M. J. Moreno
- Histocompatibility Laboratory; CEMIC-Centro de Educacion Medica e Investigaciones Clinicas Norberto Quirno; Buenos Aires; Argentina
| | - F. Oguz
- Department of Medical Biology, Medical Faculty of Istanbul; Istanbul University; Istanbul; Turkey
| | - G. Opelz
- Institute of Immunology; University of Heidelberg; Heidelberg; Germany
| | - R. Sergeant
- Immunology; Imperial College Healthcare NHS Trust; London; UK
| | - M. Tambutti
- Histocompatibility and Immunogenetics-ICBME; Hospital Italiano de Buenos Aires; Buenos Aires; Argentina
| | - S. Teper
- Histocompatibility Laboratory; CEMIC-Centro de Educacion Medica e Investigaciones Clinicas Norberto Quirno; Buenos Aires; Argentina
| | - M. Tilanus
- Transplantation Immunology, Tissue Typing Laboratory; Maastricht University Medical Center; Maastricht; The Netherlands
| | - A. Turkmen
- Department of Medical Biology, Medical Faculty of Istanbul; Istanbul University; Istanbul; Turkey
| | - A. N. Warrens
- Immunology; Imperial College Healthcare NHS Trust; London; UK
| | - W. Weimar
- Internal medicine; Erasmus Medical Center; Rotterdam; The Netherlands
| | - E. Goulmy
- Department of Immunohematology and Blood Transfusion; Leiden University Medical Center; Leiden; The Netherlands
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Hendriks M, Plass AMC, Rademakers J. Less activated patients have higher health care costs; a comparative study in a Dutch sample of diabetes patients. Eur J Public Health 2013. [DOI: 10.1093/eurpub/ckt126.188] [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: 11/14/2022] Open
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van Os J, Verkooyen R, Hendriks M, Henquet C, Bak M, Marcelis M, Delespaul P, Krabbendam L, Myin-Germeys I. [A psychosis proneness-persistence-impairment model of psychotic disorders]. Tijdschr Psychiatr 2008; 50 Spec no.:77-83. [PMID: 19067304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
There is evidence that the normally transitory developmental expression of psychosis (psychosisproneness) may first of all become abnormally persistent (persistence) and later on become clinically relevant (impairment), depending on the amount of environmental risk to which the person is exposed. According to the psychosis-proneness-persistence impairment model, genetic background factors can impact on a transitory expression of psychosis. Whether or not this will lead to a poor prognosis in terms of persistence and clinical need will depend on the interaction between environmental exposure and genetic risk.
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Affiliation(s)
- J van Os
- Vakgroep Psychiatrie, UMC Maastricht, Universiteit Maastricht, Maastricht.
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van der Strate BWA, Popa ER, Schipper M, Brouwer LA, Hendriks M, Harmsen MC, van Luyn MJA. Circulating human CD34+ progenitor cells modulate neovascularization and inflammation in a nude mouse model. J Mol Cell Cardiol 2007; 42:1086-97. [PMID: 17490680 DOI: 10.1016/j.yjmcc.2007.03.907] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2006] [Revised: 03/23/2007] [Accepted: 03/28/2007] [Indexed: 10/23/2022]
Abstract
CD34+ progenitor cells hold promise for therapeutic neovascularization in various settings. In this study, the role of human peripheral blood CD34+ cells in neovascularization and inflammatory cell recruitment was longitudinally studied in vivo. Human CD34+ cells were incorporated in Matrigel, implanted subcutaneously in nude mice, and explanted after 2, 4, 7, or 14 days. Cell-free Matrigels served as controls. Histochemical analyses demonstrated that neovascularization occurred almost exclusively in CD34+ implants. Cellular and capillary density were increased in cell-loaded Matrigels after 2 days and further increased at 14 days. Human CD34+ cells did not incorporate in neovessels, but formed vWF+/CD31+/VEGF+ cell clusters that were present up to day 14. However, CD34+ cells induced host neovascularization, as demonstrated by increased presence of murine CD31+ and vWF+ vasculature from day 7 to 14. Moreover, recruitment of murine monocytes/macrophages was significantly enhanced in CD34+ implants at all time points. Gene expression of chemotactic cytokines MCP-1 and IL-8 was detected on CD34+ cells in vitro and confirmed immunohistochemically in cell-loaded explants at all time points. Our data indicate that human CD34+ cells, implanted in a hypoxic environment, generate an angiogenic niche by secreting chemotactic and angiogenic factors, enabling rapid neovascularization, possibly via recruitment of monocytes/macrophages.
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Affiliation(s)
- B W A van der Strate
- Department of Pathology and Laboratory Medicine, Medical Biology Section, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands.
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15
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Slinger J, Muller M, Hendriks M. Exploring local knowledge of the flooding risk of the Scheldt Estuary. Water Sci Technol 2007; 56:79-86. [PMID: 17851208 DOI: 10.2166/wst.2007.539] [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] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
'The public should be involved in the decision making process' is an oft heard statement, but the practice of public participation remains a worrisome issue for policy makers and planners. In this paper we describe local knowledge of flooding risk in the vicinity of the Scheldt Estuary derived through in-depth, semi-structured interviews with fourteen inhabitants. We compare and contrast this knowledge with that of scientists involved in the assessment of the flooding hazard posed by the tidal Scheldt and with that of Dutch and Flemish policy advisors. We identify areas of common knowledge, confirm the accuracy of much local knowledge and recognize the percipience of a number of the questions posed by local inhabitants. This exploratory study serves to confirm that background local knowledge can be a valuable tool in designing responsible policy processes for flood risk management.
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Affiliation(s)
- J Slinger
- Delft University of Technology, Faculty of Technology, Policy and Management, PO Box 5015, 2600 BX Delft, Netherlands.
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16
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Rosen GD, Mesples B, Hendriks M, Galaburda AM. Histometric changes and cell death in the thalamus after neonatal neocortical injury in the rat. Neuroscience 2006; 141:875-888. [PMID: 16725276 PMCID: PMC4259052 DOI: 10.1016/j.neuroscience.2006.04.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2006] [Revised: 04/12/2006] [Accepted: 04/14/2006] [Indexed: 10/24/2022]
Abstract
Freezing injury to the developing cortical plate results in a neocortical malformation resembling four-layered microgyria. Previous work has demonstrated that following freezing injury to the somatosensory cortex, males (but not females) have more small and fewer large cells in the medial geniculate nucleus. In the first experiment, we examined the effects of induced microgyria to the somatosensory cortex on neuronal numbers, neuronal size, and nuclear volume of three sensory nuclei: ventrobasal complex, dorsal lateral geniculate nucleus, and medial geniculate nucleus. We found that there was a decrease in neuronal number and nuclear volume in ventrobasal complex of microgyric rats when compared with shams, whereas there were no differences in these variables in the dorsal lateral geniculate nucleus or medial geniculate nucleus. We also found that there were more small and fewer large neurons in both ventrobasal complex and medial geniculate nucleus. In experiment 2, we attempted to determine the role of cell death in the thalamus on these histometric measures. We found that cell death peaked within 24 h of the freezing injury and was concentrated mostly in ventrobasal complex. In addition, there was evidence of greater cell death in males at this age. Taken together, these results support the notion that males are more severely affected by early injury to the cerebral cortex than females.
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Affiliation(s)
- G D Rosen
- Dyslexia Research Laboratory and Charles A. Dana Research Institute, Department of Neurology, Division of Behavioral Neurology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA; Harvard Medical School, Boston, MA 02115, USA.
| | - B Mesples
- Dyslexia Research Laboratory and Charles A. Dana Research Institute, Department of Neurology, Division of Behavioral Neurology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA; Harvard Medical School, Boston, MA 02115, USA
| | - M Hendriks
- Dyslexia Research Laboratory and Charles A. Dana Research Institute, Department of Neurology, Division of Behavioral Neurology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA; Harvard Medical School, Boston, MA 02115, USA
| | - A M Galaburda
- Dyslexia Research Laboratory and Charles A. Dana Research Institute, Department of Neurology, Division of Behavioral Neurology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA; Harvard Medical School, Boston, MA 02115, USA
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17
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Elemans CPH, Spierts ILY, Hendriks M, Schipper H, Müller UK, van Leeuwen JL. Syringeal muscles fit the trill in ring doves (Streptopelia risoriaL.). J Exp Biol 2006; 209:965-77. [PMID: 16481585 DOI: 10.1242/jeb.02066] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
SUMMARYIn contrast to human phonation, the virtuoso vocalizations of most birds are modulated at the level of the sound generator, the syrinx. We address the hypothesis that syringeal muscles are physiologically capable of controlling the sound-generating syringeal membranes in the ring dove (Streptopelia risoria) syrinx. We establish the role of the tracheolateralis muscle and propose a new function for the sternotrachealis muscle. The tracheolateralis and sternotrachealis muscles have an antagonistic mechanical effect on the syringeal aperture. Here, we show that both syringeal muscles can dynamically control the full syringeal aperture. The tracheolateralis muscle is thought to directly alter position and tension of the vibrating syringeal membranes that determine the gating and the frequency of sound elements. Our measurements of the muscle's contractile properties, combined with existing electromyographic and endoscopic evidence, establish its modulating role during the dove's trill. The muscle delivers the highest power output at cycle frequencies that closely match the repetition rates of the fastest sound elements in the coo. We show that the two syringeal muscles share nearly identical contraction characteristics, and that sternotrachealis activity does not clearly modulate during the rapid trill. We propose that the sternotrachealis muscle acts as a damper that stabilizes longitudinal movements of the sound-generating system induced by tracheolateralis muscle contraction. The extreme performance of both syringeal muscles implies that they play an important role in fine-tuning membrane position and tension, which determines the quality of the sound for a conspecific mate.
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Affiliation(s)
- C P H Elemans
- Experimental Zoology Group, Wageningen University, Marijkeweg 40, 6709 PG, Wageningen, The Netherlands.
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18
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Verhoeven MLPM, Driessen AAG, Paul AJ, Brown A, Canry JC, Hendriks M. DSIMS characterization of a drug-containing polymer-coated cardiovascular stent. J Control Release 2004; 96:113-21. [PMID: 15063034 DOI: 10.1016/j.jconrel.2004.01.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2003] [Accepted: 01/13/2004] [Indexed: 11/22/2022]
Abstract
Dynamic Secondary Ion Mass Spectrometry (DSIMS) was used to study the release behavior of cytochalasin D, an actin polymerase inhibitor effective in the reduction of smooth muscle cell (SMC) proliferation, from a polymer-coated cardiovascular stent. High-performance liquid chromatography (HPLC) was used to determine the percentage of drug released as a function of time and showed the typical behavior of a drug-releasing system that is comprised of a core drug-polymer dispersion surrounded by a drug-free polymeric membrane: an initial burst of the drug followed by a gradual elution over time. DSIMS profiles, as a function of release time, indicated that depletion of the drug initially occurred only in the outer layers of the coating. As release progressed the DSIMS profile showed a gradual decrease of cytochalasin D with increasing depth. This study shows that DSIMS is a powerful tool for the determination of drug distributions in, and the release behavior from, thin polymer layers.
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Affiliation(s)
- M L P M Verhoeven
- Medtronic Bakken Research Center B.V., Biomaterials Technology, Endepolsdomein 5, 6229GW Maastricht, The Netherlands.
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19
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Wichers HJ, Recourt K, Hendriks M, Ebbelaar CEM, Biancone G, Hoeberichts FA, Mooibroek H, Soler-Rivas C. Cloning, expression and characterisation of two tyrosinase cDNAs from Agaricus bisporus. Appl Microbiol Biotechnol 2003; 61:336-41. [PMID: 12743763 DOI: 10.1007/s00253-002-1194-2] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2002] [Revised: 10/29/2002] [Accepted: 11/08/2002] [Indexed: 10/25/2022]
Abstract
Using primers designed on the basis of sequence homologies in the copper-binding domains for a number of plant and fungal tyrosinases, two tyrosinase encoding cDNAs were cloned from an Agaricus bisporus U1 cDNA-library. The sequences AbPPO1 and AbPPO2 were, respectively, 1.9 and 1.8 kb in size and encoded proteins of approximately 64 kDa. The cDNAs represent different loci. Both AbPPO1 and AbPPO2 occur as single copies on the genomes of the U1 parental strains H39 and H97. The genomic size of AbPPO1 and AbPPO2 is minimally 2.3 and 2.2 kb, respectively. Alignment and phylogenetic analysis of 35 tyrosinase and polyphenol oxidase sequences of animal, plant, fungal, and bacterial origin indicated conserved copper-binding domains, and stronger conservation within genera than between them. The translation products of AbPPO1 and AbPPO2 possess putative N-glycosylation and phosphorylation sites and are recognised by antibodies directed against a 43-kDa tyrosinase. The observations are consistent with previously proposed maturation and activation models for plant and fungal tyrosinases.
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Affiliation(s)
- H J Wichers
- Agrotechnological Research Institute (ATO), Bornsesteeg 59, 6708 PD Wageningen, The Netherlands.
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20
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Hendriks M, Everaerts F, Verhoeven M. Alternative fixation of bioprostheses. J Long Term Eff Med Implants 2002; 11:163-83. [PMID: 11921662] [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: 02/24/2023]
Abstract
The glutaraldehyde fixation technique for bioprosthetic tissue valves has been used for about 30 years. It is more or less generally recognized, however, that a solution to the ongoing problems of calcification and immunomodulated inflammation can only be achieved with the development of alternative fixation techniques that differ from fixation with glutaraldehyde. This review reports on the chemistry behind newly developed tissue-fixation processes and the preliminary results achieved with these.
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Affiliation(s)
- M Hendriks
- Medtronic Bakken Research Center, Materials and Biosciences Center, Endepolsdomein 5, 6229 GW Maastricht, The Netherlands.
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21
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van Wachem PB, Hendriks M, Blaauw EH, Dijk F, Verhoeven MLPM, Cahalan PT, van Luyn MJA. (Electron) microscopic observations on tissue integration of collagen-immobilized polyurethane. Biomaterials 2002; 23:1401-9. [PMID: 11833490 DOI: 10.1016/s0142-9612(01)00174-0] [Citation(s) in RCA: 16] [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: 10/27/2022]
Abstract
The foreign body reactions to collagen-immobilized polyurethane (PU-CI) films during subcutaneous implantation in rats were characterized. The underlying concept is that collagen-immobilization will improve the tissue integration. Since the method of collagen-immobilization involves the covalent coupling of collagen to an acrylic acid (AA) based surface graft, both non-modified PU and PU-AA were used as controls. Bare PU has a flat surface, whereas both PU-AA and PU-CI displayed a slightly roughened surface. Implantation showed that PU-CI induced early after implantation a far more intense foreign body reaction than PU and PU-AA. This reaction consisted of increased presence of fibrin, granulocytes and macrophages. Roughening of the surface as with PU-AA induced only a small increase in fibrin formation and cellular migration. At day 5 the reaction to PU-CI had slowed down; giant cell formation now slowly started but was decreased compared to PU and PU-AA. At day 10 capsules around each type of material looked similar, but in contrast to PU. PU-CI films could no longer be dissected from their capsules. Only at week 3 this also occurred with PU, at which time point again similar capsules with the three materials were observed. At week 6, of the three materials PU-CI showed the thinnest capsule with most immediate adherence of connective tissue. These results show that collagen-immobilization of PU increased the early tissue reaction and therefore the tissue integration. The thin capsule observed at 6 weeks may be beneficial in e.g. infectious circumstances, when easy access for immune reactions is needed. This, and the long-term performance of PU-CI will be a matter of future investigations.
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Affiliation(s)
- P B van Wachem
- Department of Medical Biology, Groningen University, The Netherlands.
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22
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van Wachem PB, Brouwer LA, Kors G, Dijk F, Bel K, Elstrodt J, van Wijk F, Cahalan PT, Hendriks M, van Luyn MJ. Animal study on surface-modified defibrillator systems: Indications for enhanced infection resistance. J Biomed Mater Res 2002; 58:384-92. [PMID: 11410896 DOI: 10.1002/jbm.1032] [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] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
One of the most important problems with ICD systems is infection. The aim of this study was an in vivo evaluation of the efficacy of defibrillator systems in terms of infection resistance. The polyurethane leads were coupled with heparin and loaded with the antibiotic gentamicin, while the PGs were modified to release gentamicin. Group I was comprised of 10 pigs implanted with either a standard or a modified system for 2 weeks; group II was implanted during 4 weeks. The lead was inserted into the heart wall via the jugular vein. The other end was subcutaneously tunneled to the armpit where the PG was positioned. A cocktail of Staphylococcus aureus and epidermidis was injected at the site of the PG. Evaluation was performed macroscopically, by taking bacterial swabs during explantation and by microscopic processing. The results showed that 3 out of 5 modified defibrillator-systems in group I and 1-2 out of 5 in group II were judged as noninfected, whereas all standard systems were infected. Infection rates of the remaining modified defibrillators showed variances, as found with the standards, from slight to moderate to high, to even high/severe in group II (1x standard and 1x modified). With the modified systems, this may be related to production of humoral factors by an intensified early tissue reaction, as indicated by a swelling at day 6 at the site of the PG. When infected, whether or not modified, usually only Staphylococcus aureus was present. Spreading of infection seemed to occur by inoculation via blood, for example, based on the observation that group II in general showed an increase in infected fibrotic overgrowth in the heart, while infectious problems were low in the jugular vein. It is concluded that the modification at short term shows enhanced infection resistance. An increased infection rate already at 4 weeks, however, indicates that the modification may not hold in the long run. Special attention is needed concerning the more intense early tissue reaction.
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Affiliation(s)
- P B van Wachem
- Tissue Engineering, Medical Biology, University of Groningen, Hanzeplein 1, Entrance 25, 9713 GZ Groningen, The Netherlands.
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23
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van Wachem PB, Brouwer LA, Zeeman R, Dijkstra PJ, Feijen J, Hendriks M, Cahalan PT, van Luyn MJ. Tissue reactions to epoxy-crosslinked porcine heart valves post-treated with detergents or a dicarboxylic acid. J Biomed Mater Res 2001; 55:415-23. [PMID: 11255196 DOI: 10.1002/1097-4636(20010605)55:3<415::aid-jbm1031>3.0.co;2-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Calcification limits the long-term durability of xenograft glutaraldehyde (GA)-crosslinked heart valves. Previously, a study in rats showed that epoxy-crosslinked heart valves reduced lymphocyte reactions to the same extent as the GA-crosslinked control and induced a similar foreign-body response and calcification reaction. The present study was aimed at reducing the occurrence of calcification of epoxy-crosslinked tissue. Two modifications were carried out and their influence on cellular reactions and the extent of calcification after 8 weeks' implantation in weanling rats was evaluated. First, epoxy-crosslinked valves were post-treated with two detergents to remove cellular elements, phospholipids and small soluble proteins, known to act as nucleation sites for calcification. The second approach was to study the effect of the impaired balance between negatively and positively charged amino acids by an additional crosslinking step with a dicarboxylic acid. The detergent treatment resulted in a washed-out appearance of especially the cusp tissue. With the dicarboxylic acid, both the cusps and the walls had a limited washed-out appearance. The wall also demonstrated some detachment of the subendothelium. After implantation, both detergent and dicarboxylic acid post-treatment histologically resulted in reduced calcification at the edges of cusps and walls. However, total amounts of calcification, measured by atomic emission spectroscopy, were not significantly reduced. Data concerning the presence of lymphocytes varied slightly, but were in the same range as the GA-crosslinked control, i.e., clearly reduced compared with a noncrosslinked control. It is concluded that both the double detergent and the dicarboxylic acid post-treatment of epoxy-crosslinked heart valve tissue do not represent a sound alternative in the fabrication of heart valve bioprostheses.
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Affiliation(s)
- P B van Wachem
- University of Groningen, Medical Biology, Tissue Engineering, University Hospital, Entrance 25, Hanzeplein 1, 9713 GZ Groningen, The Netherlands.
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24
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Abstract
The electrical conductivity of human tissue at low frequencies is discussed when a uniform electric field is applied to some tissue containing many cells. Human tissue is described as a suspension of particles in a conducting solution. Relations are derived for the apparent conductivity of a cell surrounded by a membrane. These relations can be used to estimate the accuracy of a model that considers the cell as a non-conducting particle. Usually, a tissue is composed of several types of particles. A relationship that expresses the effective conductivity of a suspension of one type of ellipsoidal particles could be found in the literature. The orientation of the particles could be uniform or they could be randomly distributed. For non-conducting particles, this expression is known as Archie's law. The expression is extended such that also the effective conductivity of a suspension of various types of particles can be calculated. The result is evaluated for the cortex of the brain using experimental data given in the literature.
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Affiliation(s)
- M J Peters
- Department of Applied Physics, Biomagnetic Centre, University of Twente, Enschede, Netherlands.
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25
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Zeeman R, Dijkstra PJ, van Wachem PB, van Luyn MJ, Hendriks M, Cahalan PT, Feijen J. The kinetics of 1,4-butanediol diglycidyl ether crosslinking of dermal sheep collagen. J Biomed Mater Res 2000; 51:541-8. [PMID: 10880101 DOI: 10.1002/1097-4636(20000915)51:4<541::aid-jbm1>3.0.co;2-p] [Citation(s) in RCA: 23] [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] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Dermal sheep collagen was crosslinked with 1,4-butanediol diglycidyl ether (BDDGE) or modified with glycidyl isopropyl ether (PGE). The reduction in amine groups as a function of time was followed to study the overall reaction kinetics of collagen with either BDDGE or PGE. Linearization of the experimental data resulted in a reaction order of 2 with respect to the amine groups in the PGE masking reaction, whereas a reaction order of 2.5 was obtained in the BDDGE crosslinking reaction. The reaction orders were independent of the pH in the range of 8.5-10.5 and the reagent concentration (1-4 wt %). The reaction order with respect to epoxide groups was equal to 1 for both reagents. As expected, the reaction rate was favored by a higher reagent concentration and a higher solution pH. Because the BDDGE crosslinking reaction occurs via two distinct reaction steps, the content of pendant epoxide groups in the collagen matrix was determined by treating the collagen with either O-phosphoryl ethanolamine or lysine methyl ester. The increase in either phosphor or primary amine groups was related to the content of pendant groups. Crosslinking at pH 9.0 resulted in a low reaction rate but in a high crosslink efficacy, especially after prolonged reaction times. A maximum concentration of pendant epoxide groups was detected after 50 h. Reaction at pH 10.0 was faster, but a lower crosslinking efficacy was obtained. At pH 10.0, the ratio between pendant epoxide groups and crosslinks was almost equal to 1 during the course of the crosslinking reaction.
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Affiliation(s)
- R Zeeman
- Department of Chemical Technology and Institute of Biomedical Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
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26
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van Wachem PB, Brouwer LA, Zeeman R, Dijkstra PJ, Feijen J, Hendriks M, Cahalan PT, van Luyn MJ. In vivo behavior of epoxy-crosslinked porcine heart valve cusps and walls. J Biomed Mater Res 2000; 53:18-27. [PMID: 10634948 DOI: 10.1002/(sici)1097-4636(2000)53:1<18::aid-jbm3>3.0.co;2-j] [Citation(s) in RCA: 23] [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] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Calcification limits the long-term durability of xenograft glutaraldehyde-crosslinked heart valves. In this study, epoxy-crosslinked porcine aortic valve tissue was evaluated after subcutaneous implantation in weanling rats. Non-crosslinked valves and valves crosslinked with glutaraldehyde or carbodiimide functioned as control. Epoxy-crosslinked valves had somewhat lower shrinkage temperatures than the crosslinked controls, and within the series also some macroscopic and microscopic differences were obvious. After 8 weeks implantation, cusps from non-crosslinked valves were not retrieved. The matching walls were more degraded than the epoxy- and control-crosslinked walls. This was observed from the higher cellular ingrowth with fibroblasts, macrophages, and giant cells. Furthermore, non-crosslinked walls showed highest numbers of lymphocytes, which were most obvious in the capsules. Epoxy- and control-crosslinked cusps and walls induced lower reactions. Calcification, measured by von Kossa-staining and by Ca-analysis, was always observed. Crosslinked cusps calcified more than walls. Of all wall samples, the non-crosslinked walls showed the highest calcification. It is concluded that epoxy-crosslinked valve tissue induced a foreign body and calcification reaction similar to the two crosslinked controls. Therefore, epoxy-crosslinking does not represent a solution for the calcification problem of heart valve bioprostheses.
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Affiliation(s)
- P B van Wachem
- University of Groningen, Faculty for Medical Sciences, Medical Biology; Cell Biology and Biomaterials, Bloemsingel 10-B2, 9712 KZ Groningen, The Netherlands
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27
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van Wachem PB, Zeeman R, Dijkstra PJ, Feijen J, Hendriks M, Cahalan PT, van Luyn MJ. Characterization and biocompatibility of epoxy-crosslinked dermal sheep collagens. J Biomed Mater Res 1999; 47:270-7. [PMID: 10449639 DOI: 10.1002/(sici)1097-4636(199911)47:2<270::aid-jbm18>3.0.co;2-d] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Dermal sheep collagen (DSC), which was crosslinked with 1, 4-butanediol diglycidyl ether (BD) by using four different conditions, was characterized and its biocompatibility was evaluated after subcutaneous implantation in rats. Crosslinking at pH 9.0 (BD90) or with successive epoxy and carbodiimide steps (BD45EN) resulted in a large increase in the shrinkage temperature (T(s)) in combination with a clear reduction in amines. Crosslinking at pH 4.5 (BD45) increased the T(s) of the material but hardly reduced the number of amines. Acylation (BD45HAc) showed the largest reduction in amines in combination with the lowest T(s). An evaluation of the implants showed that BD45, BD90, and BD45EN were biocompatible. A high influx of polymorphonuclear cells and macrophages was observed for BD45HAc, but this subsided at day 5. At week 6 the BD45 had completely degraded and BD45HAc was remarkably reduced in size, while BD45EN showed a clear size reduction of the outer DSC bundles; BD90 showed none of these features. This agreed with the observed degree of macrophage accumulation and giant cell formation. None of the materials calcified. For the purpose of soft tissue replacement, BD90 was defined as the material of choice because it combined biocompatibility, low cellular ingrowth, low biodegradation, and the absence of calcification with fibroblast ingrowth and new collagen formation.
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Affiliation(s)
- P B van Wachem
- University of Groningen, Department of Medical Sciences, Cell Biology and Biomaterials, Bloemsingel 10, 9712 KZ Groningen, The Netherlands
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28
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Zeeman R, Dijkstra PJ, van Wachem PB, van Luyn MJ, Hendriks M, Cahalan PT, Feijen J. Crosslinking and modification of dermal sheep collagen using 1, 4-butanediol diglycidyl ether. J Biomed Mater Res 1999; 46:424-33. [PMID: 10398001 DOI: 10.1002/(sici)1097-4636(19990905)46:3<424::aid-jbm16>3.0.co;2-r] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Crosslinking of dermal sheep collagen (DSC) was accomplished using 1, 4-butanediol diglycidyl ether (BDDGE). At pH values > 8.0, epoxide groups of BDDGE will react with amine groups of collagen. The effects of BDDGE concentration, pH, time, and temperature were studied. Utilization of a 4-wt % BDDGE instead of 1-wt % resulted in a faster reaction. Whereas similar values of shrinkage temperature were obtained, fewer primary amine groups had reacted at a lower BDDGE concentration, which implies that the crosslinking reaction had a higher efficacy. An increase in pH from 8.5 to 10.5 resulted in a faster reaction but reduced crosslink efficacy. Furthermore, an increase in reaction temperature accelerated the reaction without changing the crosslink efficacy. Crosslinking under acidic conditions (pH < 6.0) evoked a reaction between epoxide groups and carboxylic acid groups of collagen. Additional studies showed that no oligomeric crosslinks could be formed. However, hydrolysis of the epoxide groups played a role in the crosslink mechanism especially under acidic reaction conditions. The macroscopic properties of these materials were dependent on the crosslinking method. Whereas a flexible and soft tissue was found if crosslinking was performed at pH < 6.0, a stiff sponge was obtained under alkaline conditions. Reaction of DSC with a monofunctional compound (glycidyl isopropyl ether) led to comparable trends in reaction rate and in similar macroscopical differences in materials as observed with BDDGE.
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Affiliation(s)
- R Zeeman
- Department of Chemical Technology, and Institute of Biomedical Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
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Zeeman R, Dijkstra PJ, van Wachem PB, van Luyn MJ, Hendriks M, Cahalan PT, Feijen J. Successive epoxy and carbodiimide cross-linking of dermal sheep collagen. Biomaterials 1999; 20:921-31. [PMID: 10353646 DOI: 10.1016/s0142-9612(98)00242-7] [Citation(s) in RCA: 144] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Cross-linking of dermal sheep collagen (N-DSC, T(S) = 46 degrees C, number of amine groups = 31 (n/1000)) with 1,4-butanediol diglycidyl ether (BDDGE) at pH 9.0 resulted in a material (BD90) with a high T(S)(69 degrees C), a decreased number of amine groups of 15 (n/1000) and a high resistance towards collagenase and pronase degradation. Reaction of DSC with BDDGE at pH 4.5 yielded a material (BD45) with a T(S) of 64 degrees C, hardly any reduction in amine groups and a lower stability towards enzymatic degradation as compared to BD90. The tensile strength of BD45 (9.2 MPa) was substantially improved as compared to N-DSC (2.4 MPa), whereas the elongation at break was reduced from 210 to 140%. BD90 had a tensile strength of 2.6 MPa and an elongation at break of only 93%. To improve the resistance to enzymes and to retain the favorable tensile properties, BD45 was post-treated with 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide (EDC) in the presence of N-hydroxysuccinimide (NHS) to give BD45EN. Additional cross-linking via the formation of amide bonds took place as indicated by the T(S) of 81 degrees C and the residual number of amine groups of 19 (n/1000). BD45EN was stable during exposure to both collagenase and pronase solutions. The tensile properties (tensile strength 7.2 MPa, elongation at break 100%) were comparable to those of BD45 and glutaraldehyde treated controls (G-DSC). Acylation of the residual amine groups of BD45 with acetic acid N-hydroxysuccinimide ester (HAc-NHS) yielded BD45HAc with a large reduction in amine groups to 10 (n/1000) and a small reduction in T(S) to 62 degrees C. The stability towards enzymatic degradation was reduced, but the tensile properties were comparable to BD45.
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Affiliation(s)
- R Zeeman
- Department of Chemical Technology, and Institute of Biomedical Technology, University of Twente, Enschede, The Netherlands
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van Wachem PB, Blaauw EH, de Vries-Hospers HG, Geerdes BP, Woloszko J, Verhoeven ML, Hendriks M, Cahalan PT, van Luyn MJ. Tissue reactions to bacteria-challenged implantable leads with enhanced infection resistance. J Biomed Mater Res 1998; 41:142-53. [PMID: 9641634 DOI: 10.1002/(sici)1097-4636(199807)41:1<142::aid-jbm17>3.0.co;2-p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Tissue reactions to implantable pacemaker leads were investigated in an early infection model in rabbits. Both standard leads and surface-modified leads were used. The surface modification technique was applied to achieve controlled release of the antibiotic gentamicin. The insulating polyurethane tubing material of the leads was provided with an acrylic acid/acrylamide copolymer surface graft and then loaded with gentamicin. Implantation periods varied from day 4, to week 3 1/2, to week 10. We investigated tissue reactions in the absence of an infectious challenge and also the efficacy of surface-modified leads in preventing infection after challenge with Staphylococcus aureus was evaluated. It was demonstrated that the applied surface modification did not induce adverse effects although during early postimplantation an increase in infiltration of granulocytes and macrophages and wound fluid and fibrin deposition were observed. After bacterial challenge, standard leads were heavily infected at each explantation period, denoted by abscesses, cellular debris, and bacterial colonies. In contrast, little or no infection was observed, either macroscopically or by bacterial cultures, with the surface-modified leads. Microscopy showed little evidence of the bacterial challenge, and that primarily at day 4. It was concluded that the applied surface modification demonstrated enhanced infection resistance and thus represents a sound approach to the battle against infectious complications with biomaterials.
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Affiliation(s)
- P B van Wachem
- Groningen University, Faculty for Medical Sciences, Cell Biology and Biomaterials, The Netherlands
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31
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van der Vuurst H, Hendriks M, Lapetina EG, van Willigen G, Akkerman JW. Maturation of megakaryoblastic cells is accompanied by upregulation of G(s)alpha-L subtype and increased cAMP accumulation. Thromb Haemost 1998; 79:1014-20. [PMID: 9609239] [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: 02/07/2023]
Abstract
In platelets and megakaryoblasts Gs, the trimeric G-protein that stimulates adenylyl cyclase, is present in a short, 45 kDa, and a long, 52 kDa isoform termed G(s)alpha-S and G(s)alpha-L, respectively. To assess the relative contribution of these isoforms in the cellular synthesis of cAMP, the ratio G(s)alpha-S/G(s)alpha-L was changed in the megakaryoblastic cell line DAMI by inducing cell maturation with recombinant human thrombopoietin (TPO) or the phorbol ester PMA. Flow cytometric analysis confirmed that this treatment induced a moderate (TPO) and extensive (PMA) increase in nuclear ploidy and expression of the glycoproteins-IIIa and -Ib. Northern blot analysis revealed downregulation of total Gs-mRNA after treatment of DAMI-cells with TPO and PMA. Western blot analysis showed significant (P < 0.05) upregulation of Gs-L with respective amounts of 27 +/- 4% of total Gs in untreated cells, 35 +/- 1% in TPO- and 41 +/- 3% in PMA-treated DAMI cells (n = 3-4). DAMI cells contained 6 +/- 1 pmol cAMP/10(6) cells, which was not changed by treatment with TPO or PMA. In untreated cells this level increased to 70 +/- 9 pmol cAMP/10(6) cells after 10 min stimulation with 1 micromol/l of the stable prostacyclin analog iloprost. The same stimulation with iloprost resulted in 165 +/- 32 pmol cAMP/10(6) in TPO-treated cells and in 588 +/- 100 pmol cAMP/10(6) in cells treated with PMA. Thus, a shift from G(s)alpha-S to G(s)alpha-L during megakaryoblast maturation strongly potentiates the production of cAMP. A similar shift may occur during normal megakaryocyte maturation and may explain the extreme sensitivity to prostacyclin of platelets, which contain G(s)alpha-S and G(s)alpha-L in approximately equal amounts.
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Affiliation(s)
- H van der Vuurst
- Department of Haematology, University Hospital Utrecht, The Netherlands
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Hendriks M, Fernandes M, le Roux M, Hussey G. An evaluation of the protein energy malnutrition scheme in the Northern Cape Province of South Africa. S Afr Med J 1998; 88:3-778. [PMID: 20593614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023] Open
Affiliation(s)
- M Hendriks
- Child Health Unit, University of Cape Town, Northern Cape
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van der Vuurst H, van Willigen G, van Spronsen A, Hendriks M, Donath J, Akkerman JW. Signal transduction through trimeric G proteins in megakaryoblastic cell lines. Arterioscler Thromb Vasc Biol 1997; 17:1830-6. [PMID: 9327784 DOI: 10.1161/01.atv.17.9.1830] [Citation(s) in RCA: 26] [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: 02/05/2023]
Abstract
The biogenesis of trimeric G proteins was investigated by measurement of the expression of alpha-subunits in the megakaryoblastic cell lines MEG-01, DAMI, and CHRF-288-11, representing stages of increasing maturation, and compared with platelets. Megakaryoblasts and platelets contained approximately equal amounts of Gi alpha-1/2, Gi alpha-3, Gq alpha, and G12 alpha protein. Maturation was accompanied by (1) downregulation of mRNA for Gs alpha and disappearance of iloprost-induced Ca2+ mobilization, (2) upregulation of the long form of Gs alpha protein (Gs alpha-L) and an increase in iloprost-induced cAMP formation, and (3) upregulation of G16 alpha mRNA and G16 alpha protein and appearance of thromboxane A2-induced signaling (Ca2+ mobilization and stimulation of prostaglandin I2-induced cAMP formation). Gz alpha protein was absent in the megakaryoblasts despite weak expression of Gz alpha mRNA in DAMI and relatively high levels of Gz alpha mRNA and Gz alpha protein in platelets. These findings reveal major changes in G protein-mediated signal transduction during megakaryocytopoiesis and indicate that G16 alpha couples the thromboxane receptor to phospholipase C beta.
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Affiliation(s)
- H van der Vuurst
- Department of Hematology, University Hospital Utrecht, Netherlands
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van Wachem PB, van Luyn MJ, de Wit AW, Raatjes D, Hendriks M, Verhoeven ML, Cahalan PT. Tissue reactions to bacteria-inoculated rat lead samples. II. Effect of local gentamicin release through surface-modified polyurethane tubing. J Biomed Mater Res 1997; 35:233-47. [PMID: 9135172 DOI: 10.1002/(sici)1097-4636(199705)35:2<233::aid-jbm11>3.0.co;2-i] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A surface modification technique was developed to achieve controlled release of gentamicin from implanted polyurethane (PU) rat lead samples. PU tubing first was provided with an acrylic acid/acrylamide copolymer surface graft and then loaded with gentamicin. This surface modification technique resulted in release of gentamicin base (GB) and was applied either to the inner luminal surface only (PU-GB-1x) or to both the inner and outer surfaces (PU-GB-2x). First we investigated whether the early tissue response was harmfully compromised when surface-modified rat lead samples were implanted without any infectious challenge. Additionally, the efficacy of this type of local gentamicin therapy was investigated by establishing its effect on tissue response and its ability to prevent lead-related infections after inoculation with Staphylococcus aureus. It was demonstrated that the applied surface modification(s) did not induce adverse effects although an increase in the infiltration of granulocytes and macrophages and an increase in the formation of wound fluid and fibrin were observed. This effect was stronger with PU-GB-2x than with PU-GB-1x. With bacterial inoculation the applied surface modification successfully suppressed the infectious challenge, PU-GB-2x more effectively than PU-GB-1x. PU-GB-2x also was more effective when compared to the gentamicin-delivery methods discussed in the first part of this two-part study, i.e., release through a vicinal gentamicin-containing collagen sponge and preoperative gentamicin solution-dipping of rat lead samples.
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Affiliation(s)
- P B van Wachem
- Groningen University, Laboratory for Cell Biology and Electron Microscopy, The Netherlands
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35
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van Wachem PB, van Luyn MJ, de Wit AW, Raatjes D, Hendriks M, Verhoeven ML, Cahalan PT. Tissue reactions to bacteria-inoculated rat lead samples. I. Effect of local gentamicin release through vicinal sponge or solution-dipping. J Biomed Mater Res 1997; 35:217-32. [PMID: 9135171 DOI: 10.1002/(sici)1097-4636(199705)35:2<217::aid-jbm10>3.0.co;2-e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The effect of local gentamicin release through a vicinal collagen sponge or through preoperative solution-dipping of rat lead samples was investigated in an early-infection model. The efficacy of these methods and their effect on tissue response were determined. It was demonstrated that both methods of local gentamicin release suppress lead-related infectious complications as compared to the control lead, which showed a high presence of inflamed/infected tissues and bacterial growth at each explantation time point. The first day the vicinal collagen sponge was more effective in suppressing the infection than was the solution-dipped lead, probably because there is a faster and higher dose release of gentamicin from the sponge. However, continued implantation time revealed that gentamicin release from the solution-dipped lead was more effective than the sponge. This supports our hypothesis that the presence of lumina are decisive for bacterial growth and persistence of implant-related infections.
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Affiliation(s)
- P B van Wachem
- Groningen University, Laboratory for Cell Biology and Electron Microscopy, The Netherlands
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Smeets RL, Garner KM, Hendriks M, van Emst-de Vries SE, Peacock MD, Hendriks W, de Pont JJ, Willems PH. Recovery from TPA inhibition of receptor-mediated Ca2+ mobilization is paralleled by down-regulation of protein kinase C-alpha in CHO cells expressing the CCK-A receptor. Cell Calcium 1996; 20:1-9. [PMID: 8864566 DOI: 10.1016/s0143-4160(96)90045-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Digital-imaging microscopy of Fura-2-loaded Chinese hamster ovary cells, stably expressing the cholecystokinin-A receptor, revealed that both the C-terminal octapeptide of cholecystokinin (CCKB) and its analogue JMV-180, which acts as an agonist at the high-affinity CCK-A receptor, recruited CHO-CCK-A cells dose-dependently in terms of receptor-mediated Ca2+ mobilization. Agonist-evoked cell recruitment was inhibited by short-term (10 min) pretreatment with 0.1 microM 12-O-tetradecanoylphorbol 13-acetate (TPA). In the case of CCKB, inhibition was overcome with increasing of the hormone concentration. In contrast, increasing of the JMV-180 concentration did not reverse the inhibitory action of TPA. CHO-CCK-A cells gradually regained their responsiveness to JMV-180 during prolonged TPA pretreatment. Complete recovery was observed within 1 h following addition of TPA. Western blot analysis using antibodies directed against the various PKC isotypes revealed that recovery was paralleled by the disappearance of PKC-alpha. Surprisingly, short-term (10 min) TPA pretreatment virtually completely inhibited the formation of inositol 1,4,5-trisphosphate [Ins(1,4,5)P3] in response to CCKB concentrations at which the effect on cell recruitment was not affected by short term phorbol ester pretreatment. Together with the finding that JMV-180 does not detectably increase the cellular Ins(1,4,5)P3 content, this suggests a large overproduction of this second messenger by CCKB concentrations supramaximal in terms of cell recruitment. Again, full responsiveness was observed after long term TPA pretreatment. The present observations are in agreement with the idea that in CHO-CCK-A cells activation of PKC-alpha leads to inhibition of agonist-evoked Ca2+ mobilization through inhibition of receptor-stimulated Ins(1,4,5)P3 formation.
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Affiliation(s)
- R L Smeets
- Department of Biochemistry, University of Nijmegen, The Netherlands
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37
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Cammue BP, Thevissen K, Hendriks M, Eggermont K, Goderis IJ, Proost P, Van Damme J, Osborn RW, Guerbette F, Kader JC. A potent antimicrobial protein from onion seeds showing sequence homology to plant lipid transfer proteins. Plant Physiol 1995; 109:445-55. [PMID: 7480341 PMCID: PMC157606 DOI: 10.1104/pp.109.2.445] [Citation(s) in RCA: 180] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
An antimicrobial protein of about 10 kD, called Ace-AMP1, was isolated from onion (Allium cepa L.) seeds. Based on the near-complete amino acid sequence of this protein, oligonucleotides were designed for polymerase chain reaction-based cloning of the corresponding cDNA. The mature protein is homologous to plant nonspecific lipid transfer proteins (nsLTPs), but it shares only 76% of the residues that are conserved among all known plant nsLTPs and is unusually rich in arginine. Ace-AMP1 inhibits all 12 tested plant pathogenic fungi at concentrations below 10 micrograms mL-1. Its antifungal activity is either not at all or is weakly affected by the presence of different cations at concentrations approximating physiological ionic strength conditions. Ace-AMP1 is also active on two Gram-positive bacteria but is apparently not toxic for Gram-negative bacteria and cultured human cells. In contrast to nsLTPs such as those isolated from radish or maize seeds, Ace-AMP1 was unable to transfer phospholipids from liposomes to mitochondria. On the other hand, lipid transfer proteins from wheat and maize seeds showed little or no antimicrobial activity, whereas the radish lipid transfer protein displayed antifungal activity only in media with low cation concentrations. The relevance of these findings with regard to the function of nsLTPs is discussed.
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Affiliation(s)
- B P Cammue
- F.A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, Heverlee, Belgium
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Lindhout T, Blezer R, Schoen P, Willems GM, Fouache B, Verhoeven M, Hendriks M, Cahalan L, Cahalan PT. Antithrombin activity of surface-bound heparin studied under flow conditions. J Biomed Mater Res 1995; 29:1255-66. [PMID: 8557728 DOI: 10.1002/jbm.820291013] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Polyacrylamide-grafted polyetherurethane sheets were modified by end-point and multipoint attachment of heparin. The surface-bound heparin was firmly attached. No release of heparin activity could be detected when the surface was rinsed at a wall shear rate of 2000 s-1. Uptake of antithrombin and thrombin inactivation were investigated under well-defined flow conditions by the use of a spinning device with an attached disk-shaped heparinized surface. It is demonstrated that the rate of thrombin inactivation at the antithrombin-heparin surface equals the maximal rate of transport of thrombin toward the surface when the surface coverage of antithrombin exceeds 10 pmol/cm2. This result indicates that a higher intrinsic catalytic efficiency of a surface does not necessarily result in a higher antithrombin activity. We varied the heparin content of the surfaces between 0 and 35 micrograms/cm2 by increasing the number of functional groups to which heparin could be covalently attached. The uptake of antithrombin increased with the heparin content of the surface, but the stoichiometry decreased from 2 to 0.5 pmol antithrombin/micrograms heparin. Apparently, antithrombin could not bind to heparins buried in the poly(acrylamide) layer. The rate of thrombin inactivation at surfaces with low heparin content (2 micrograms/cm2) fells below the transport limit of thrombin and became proportional with the heparin content of the surface. Although the contribution of surface-bound heparin to the neutralization of fluid-phase thrombin was found to be negligible compared with the effect of fluid-phase antithrombin at physiologic relevant concentrations, these heparinized surfaces markedly delayed the onset of thrombin generation in platelet-rich plasma.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- T Lindhout
- Biomaterials and Polymer Research Institute (Bioprime), University of Limburg, The Netherlands
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Sapatnekar S, Kieswetter KM, Merritt K, Anderson JM, Cahalan L, Verhoeven M, Hendriks M, Fouache B, Cahalan P. Blood-biomaterial interactions in a flow system in the presence of bacteria: effect of protein adsorption. J Biomed Mater Res 1995; 29:247-56. [PMID: 7738073 DOI: 10.1002/jbm.820290216] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
An in vitro continuous flow system with whole human blood was used to study blood-biomaterial interactions on a base polyurethane and three modified surfaces in the presence and absence of circulating Staphylococcus epidermidis. We hypothesized that the composition of the protein layer adsorbed on the surface of the biomaterial would influence the response of blood components and bacteria. We examined the test surfaces for adsorption of nine plasma proteins and adsorption profiles differed on the four surfaces. The positively charged surface, UC, adsorbed significantly higher amounts of fibronectin (P < .01), von Willebrand factor (P < .01), and fibrinogen (P < .05) than the other materials. As a consequence of increased adsorption of these adhesive proteins, the adhesion of platelets and bacteria was greater on UC than on any other surface. On the base polyurethane, BC, and the negatively charged surface, UA, protein adsorption was low, and these materials were largely free of adherent blood cells and bacteria. The heparinized surface, UH, adsorbed higher quantities (P < .01) of Hageman factor and high molecular weight kininogen relative to the other surfaces. Platelet adhesion, and surface coagulation were prominent on UC, and may have contributed to increased bacterial adhesion on this surface. In the presence of circulating bacteria, adsorption was generally lower than in the absence of bacteria. The pattern of protein adsorption was largely unaffected by the strain of circulating bacteria, but platelet responses (adhesion and activation) were greater in the presence of slime-producing S. epidermidis as compared to the non-slime-producing strain, suggesting that slime may have a direct activating effect on platelets.
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Affiliation(s)
- S Sapatnekar
- Institute of Pathology, Case Western Reserve University, Cleveland, Ohio 44106, USA
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40
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Gualtieri G, Gualtieri I, Hendriks M, Gagliardi S. Comparison of cemented ceramic and metal-polyethylene coupling hip prostheses in ankylosing spondylitis. Clin Orthop Relat Res 1992:81-5. [PMID: 1516332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Two groups of patients suffering from ankylosing spondylitis were treated by total hip arthroplasty. Twenty-one patients (37 hips) were treated with cemented metal-polyethylene prosthesis, whereas 18 patients (36 hips) had cemented ceramic coupling implants. The two groups had similar preoperative clinical data. The average follow-up period was seven to eight years for both. Each patient was graded clinically (pain, function, range of motion, deformities) and roentgenographically (radiolucent lines, etc.). Patients with metal-polyethylene implants showed important modifications of the bone around the implant. Clinical and roentgenographic results were relatively good in patients with ceramic implants. The results underline the importance of the friction coupling of the implant.
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Affiliation(s)
- G Gualtieri
- Rizzoli Orthopaedic Institute, Bologna, Italy
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41
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Gualtieri G, Gualtieri I, Gagliardi S, Hendriks M, Giunti A. Arthroprosthetic reimplantation with bioceramics. Ital J Orthop Traumatol 1990; 16:305-10. [PMID: 2099914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The study analyzes the results obtained in 50 cases of arthroprosthetic substitution surgery performed as a result of "aseptic detachment of the implant"; it involves a consecutive series of operations performed between 1979 and 1983. In all of the cases ceramic-ceramic cemented prostheses were implanted. The results, which were generally satisfactory, confirmed the excellent properties of alumina (low wear, elevated tolerance).
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Affiliation(s)
- G Gualtieri
- III Clinica Ortopedica dell'Università, Istituto Ortopedico Rizzoli, Bologna
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42
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Gualtieri G, Hendriks M, Gualtieri I, Prosperi P. [Fracture of the tibial plateau: results of surgical treatment]. Chir Organi Mov 1989; 74:13-20. [PMID: 2612264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The different types of tibial plateau fractures have similar problems. Today most of them are treated surgically to obtain the adequate reduction. Ninety-three fractures of the tibial plateau have been reviewed. The clinical and X-ray examinations were performed from 7 to 13 years after surgery. Poor results with ligamentous instability and posttraumatic arthritis seem to be related to insufficient reduction of the fracture, loose fragments in the joint, axial angulation and insufficient repair of ligaments and menisci.
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43
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Gualtieri G, Gualtieri I, Gagliardi S, Hendriks M. [Ankylosing spondylitis: long-term results of implantation of hip joint prosthesis]. Chir Organi Mov 1988; 73:199-203. [PMID: 3243102] [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: 01/04/2023]
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44
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Mossel DA, van Rossem F, Koopmans M, Hendriks M, Verouden M, Eelderink I. Quality control of solid culture media: a comparison of the classic and the so-called ecometric technique. J Appl Bacteriol 1980; 49:439-54. [PMID: 7216926 DOI: 10.1111/j.1365-2672.1980.tb04719.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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