1
|
Gladow N, Hollmann C, Weirather J, Ding X, Burkard M, Uehlein S, Bharti R, Förstner K, Kerkau T, Beyersdorf N, Frantz S, Ramos G, Hofmann U. Role of CD4 + T-cells for regulating splenic myelopoiesis and monocyte differentiation after experimental myocardial infarction. Basic Res Cardiol 2024; 119:261-275. [PMID: 38436707 PMCID: PMC11008073 DOI: 10.1007/s00395-024-01035-3] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 01/10/2024] [Accepted: 01/27/2024] [Indexed: 03/05/2024]
Abstract
Myocardial infarction (MI) induces the generation of proinflammatory Ly6Chigh monocytes in the spleen and the recruitment of these cells to the myocardium. CD4+ Foxp3+ CD25+ T-cells (Tregs) promote the healing process after myocardial infarction by engendering a pro-healing differentiation state in myocardial monocyte-derived macrophages. We aimed to study the effects of CD4+ T-cells on splenic myelopoiesis and monocyte differentiation. We instigated MI in mice and found that MI-induced splenic myelopoiesis is abrogated in CD4+ T-cell deficient animals. Conventional CD4+ T-cells promoted myelopoiesis in vitro by cell-cell-contact and paracrine mechanisms, including interferon-gamma (IFN-γ) signalling. Depletion of regulatory T-cells enhanced myelopoiesis in vivo, as evidenced by increases in progenitor cell numbers and proliferative activity in the spleen 5 days after MI. The frequency of CD4+ T-cells-producing factors that promote myelopoiesis increased within the spleen of Treg-depleted mice. Moreover, depletion of Tregs caused a proinflammatory bias in splenic Ly6Chigh monocytes, which showed predominantly upregulated expression of IFN-γ responsive genes after MI. Our results indicate that conventional CD4+ T-cells promote and Tregs attenuate splenic myelopoiesis and proinflammatory differentiation of monocytes.
Collapse
Affiliation(s)
- Nadine Gladow
- Department of Internal Medicine I, University Clinic Würzburg, Würzburg, Germany.
- Comprehensive Heart Failure Centre, University Clinic Würzburg, Würzburg, Germany.
| | - Claudia Hollmann
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | | | - Xin Ding
- Department of Internal Medicine I, University Clinic Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Centre, University Clinic Würzburg, Würzburg, Germany
| | - Matthias Burkard
- Department of Internal Medicine I, University Clinic Würzburg, Würzburg, Germany
| | - Sabrina Uehlein
- Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany
| | - Richa Bharti
- TUM Campus, Straubing for Biotechnology and Sustainability, Weihenstephan-Triesdorf University of Applied Sciences, Straubing, Germany
| | - Konrad Förstner
- ZB MED-Information Centre for Life Sciences, Cologne, Germany
- Faculty of Information Science and Communication Studies, Cologne University of Applied Sciences, Cologne, Germany
| | - Thomas Kerkau
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Niklas Beyersdorf
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Stefan Frantz
- Department of Internal Medicine I, University Clinic Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Centre, University Clinic Würzburg, Würzburg, Germany
| | - Gustavo Ramos
- Department of Internal Medicine I, University Clinic Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Centre, University Clinic Würzburg, Würzburg, Germany
| | - Ulrich Hofmann
- Department of Internal Medicine I, University Clinic Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Centre, University Clinic Würzburg, Würzburg, Germany
| |
Collapse
|
2
|
Liu Z, Hollmann C, Kalanidhi S, Grothey A, Keating S, Mena-Palomo I, Lamer S, Schlosser A, Kaiping A, Scheller C, Sotzny F, Horn A, Nürnberger C, Cejka V, Afshar B, Bahmer T, Schreiber S, Vehreschild JJ, Miljukov O, Schäfer C, Kretzler L, Keil T, Reese JP, Eichner FA, Schmidbauer L, Heuschmann PU, Störk S, Morbach C, Riemekasten G, Beyersdorf N, Scheibenbogen C, Naviaux RK, Williams M, Ariza ME, Prusty BK. Increased circulating fibronectin, depletion of natural IgM and heightened EBV, HSV-1 reactivation in ME/CFS and long COVID. medRxiv 2023:2023.06.23.23291827. [PMID: 37425897 PMCID: PMC10327231 DOI: 10.1101/2023.06.23.23291827] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
Myalgic Encephalomyelitis/ Chronic Fatigue syndrome (ME/CFS) is a complex, debilitating, long-term illness without a diagnostic biomarker. ME/CFS patients share overlapping symptoms with long COVID patients, an observation which has strengthened the infectious origin hypothesis of ME/CFS. However, the exact sequence of events leading to disease development is largely unknown for both clinical conditions. Here we show antibody response to herpesvirus dUTPases, particularly to that of Epstein-Barr virus (EBV) and HSV-1, increased circulating fibronectin (FN1) levels in serum and depletion of natural IgM against fibronectin ((n)IgM-FN1) are common factors for both severe ME/CFS and long COVID. We provide evidence for herpesvirus dUTPases-mediated alterations in host cell cytoskeleton, mitochondrial dysfunction and OXPHOS. Our data show altered active immune complexes, immunoglobulin-mediated mitochondrial fragmentation as well as adaptive IgM production in ME/CFS patients. Our findings provide mechanistic insight into both ME/CFS and long COVID development. Finding of increased circulating FN1 and depletion of (n)IgM-FN1 as a biomarker for the severity of both ME/CFS and long COVID has an immediate implication in diagnostics and development of treatment modalities.
Collapse
Affiliation(s)
- Zheng Liu
- Institute for Virology and Immunobiology, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Claudia Hollmann
- Institute for Virology and Immunobiology, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Sharada Kalanidhi
- Stanford Genome Technology Center, Stanford University School of Medicine, Stanford, CA, USA
| | - Arnhild Grothey
- Institute for Virology and Immunobiology, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Sam Keating
- Institute for Virology and Immunobiology, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Irene Mena-Palomo
- Institute for Medical Data Sciences, University Hospital Würzburg, Würzburg
| | - Stephanie Lamer
- Rudolf Virchow Center, Center for Translational Bioimaging, Julius-Maximilians-University of Würzburg, Germany
| | - Andreas Schlosser
- Rudolf Virchow Center, Center for Translational Bioimaging, Julius-Maximilians-University of Würzburg, Germany
| | - Agnes Kaiping
- Institute for Virology and Immunobiology, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Carsten Scheller
- Institute for Virology and Immunobiology, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Franzeska Sotzny
- Institute for Medical Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Anna Horn
- Institute of Clinical Epidemiology and Biometry, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Carolin Nürnberger
- Institute of Clinical Epidemiology and Biometry, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Vladimir Cejka
- Department of Clinical Research & Epidemiology, Comprehensive Heart Failure Center and Department of Medicine I, University Hospital Würzburg, Würzburg, Germany
| | - Boshra Afshar
- Institute for Virology and Immunobiology, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Thomas Bahmer
- Internal Medicine Department I, University Hospital Schleswig-Holstein UKSH - Campus Kiel, Kiel, Germany
| | - Stefan Schreiber
- Internal Medicine Department I, University Hospital Schleswig-Holstein UKSH - Campus Kiel, Kiel, Germany
| | - Jörg Janne Vehreschild
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf, Germany
| | - Olga Miljukov
- Institute of Clinical Epidemiology and Biometry, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Christian Schäfer
- University Medicine Greifswald, Institute of Clinical Chemistry and Laboratory Medicine, Greifswald, Germany
| | - Luzie Kretzler
- Charité - Universitätsmedizin Berlin and Berlin Institute of Health (BIH), Berlin, Germany
| | - Thomas Keil
- Charité - Universitätsmedizin Berlin and Berlin Institute of Health (BIH), Berlin, Germany
| | - Jens-Peter Reese
- Institute of Clinical Epidemiology and Biometry, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Felizitas A Eichner
- Institute of Clinical Epidemiology and Biometry, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Lena Schmidbauer
- Institute of Clinical Epidemiology and Biometry, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Peter U Heuschmann
- Institute of Clinical Epidemiology and Biometry, Julius-Maximilians-University of Würzburg, Würzburg, Germany
- Institute for Medical Data Sciences, University Hospital Würzburg, Würzburg
- Clinical Trial Center, University Hospital Würzburg, Würzburg
| | - Stefan Störk
- Department of Clinical Research & Epidemiology, Comprehensive Heart Failure Center and Department of Medicine I, University Hospital Würzburg, Würzburg, Germany
| | - Caroline Morbach
- Department of Clinical Research & Epidemiology, Comprehensive Heart Failure Center and Department of Medicine I, University Hospital Würzburg, Würzburg, Germany
| | | | - Niklas Beyersdorf
- Institute for Virology and Immunobiology, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| | - Carmen Scheibenbogen
- Institute for Medical Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Robert K Naviaux
- Departments of Medicine, Pediatrics, and Pathology, University of California, San Diego School of Medicine, San Diego, USA
| | - Marshall Williams
- Institute for Behavioral Medicine Research (IBMR), The Ohio State University, Columbus, Ohio, USA
| | - Maria E Ariza
- Institute for Behavioral Medicine Research (IBMR), The Ohio State University, Columbus, Ohio, USA
| | - Bhupesh K Prusty
- Institute for Virology and Immunobiology, Julius-Maximilians-University of Würzburg, Würzburg, Germany
| |
Collapse
|
3
|
Wiese T, Dennstädt F, Hollmann C, Stonawski S, Wurst C, Fink J, Gorte E, Mandasari P, Domschke K, Hommers L, Vanhove B, Schumacher F, Kleuser B, Seibel J, Rohr J, Buttmann M, Menke A, Schneider-Schaulies J, Beyersdorf N. Inhibition of acid sphingomyelinase increases regulatory T cells in humans. Brain Commun 2021; 3:fcab020. [PMID: 33898989 PMCID: PMC8054263 DOI: 10.1093/braincomms/fcab020] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 11/11/2020] [Accepted: 12/15/2020] [Indexed: 12/27/2022] Open
Abstract
Genetic deficiency for acid sphingomyelinase or its pharmacological inhibition has been shown to increase Foxp3+ regulatory T-cell frequencies among CD4+ T cells in mice. We now investigated whether pharmacological targeting of the acid sphingomyelinase, which catalyzes the cleavage of sphingomyelin to ceramide and phosphorylcholine, also allows to manipulate relative CD4+ Foxp3+ regulatory T-cell frequencies in humans. Pharmacological acid sphingomyelinase inhibition with antidepressants like sertraline, but not those without an inhibitory effect on acid sphingomyelinase activity like citalopram, increased the frequency of Foxp3+ regulatory T cell among human CD4+ T cells in vitro. In an observational prospective clinical study with patients suffering from major depression, we observed that acid sphingomyelinase-inhibiting antidepressants induced a stronger relative increase in the frequency of CD4+ Foxp3+ regulatory T cells in peripheral blood than acid sphingomyelinase-non- or weakly inhibiting antidepressants. This was particularly true for CD45RA− CD25high effector CD4+ Foxp3+ regulatory T cells. Mechanistically, our data indicate that the positive effect of acid sphingomyelinase inhibition on CD4+ Foxp3+ regulatory T cells required CD28 co-stimulation, suggesting that enhanced CD28 co-stimulation was the driver of the observed increase in the frequency of Foxp3+ regulatory T cells among human CD4+ T cells. In summary, the widely induced pharmacological inhibition of acid sphingomyelinase activity in patients leads to an increase in Foxp3+ regulatory T-cell frequencies among CD4+ T cells in humans both in vivo and in vitro.
Collapse
Affiliation(s)
- Teresa Wiese
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg 97078, Germany
| | - Fabio Dennstädt
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg 97078, Germany
| | - Claudia Hollmann
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg 97078, Germany
| | - Saskia Stonawski
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital of Würzburg, Würzburg 97080, Germany
| | - Catherina Wurst
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital of Würzburg, Würzburg 97080, Germany
| | - Julian Fink
- Institute of Organic Chemistry, University of Würzburg, Würzburg 97074, Germany
| | - Erika Gorte
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg 97078, Germany
| | - Putri Mandasari
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg 97078, Germany
| | - Katharina Domschke
- Department of Psychiatry and Psychotherapy, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg 79104, Germany
| | - Leif Hommers
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital of Würzburg, Würzburg 97080, Germany.,Comprehensive Heart Failure Center, University Hospital of Würzburg, Würzburg 97080, Germany.,Interdisciplinary Center for Clinical Research, University of Würzburg, Würzburg 97080, Germany
| | - Bernard Vanhove
- Centre de Recherche en Transplantation et Immunologie UMR 1064, INSERM, Université de Nantes, Nantes, France.,Institut de Transplantation Urologie Néphrologie (ITUN), CHU Nantes, Nantes, France.,OSE Immunotherapeutics S.A., Nantes, France
| | - Fabian Schumacher
- Institute of Nutritional Science, University of Potsdam, Nuthetal D-14558, Germany
| | - Burkhard Kleuser
- Institute of Nutritional Science, University of Potsdam, Nuthetal D-14558, Germany
| | - Jürgen Seibel
- Institute of Organic Chemistry, University of Würzburg, Würzburg 97074, Germany
| | - Jan Rohr
- Center for Chronic Immunodeficiency (CCI), Medical Center-University of Freiburg, Freiburg 79106, Germany
| | - Mathias Buttmann
- Department of Neurology, Caritas Hospital, Bad Mergentheim 97980, Germany.,Department of Neurology, University Hospital Würzburg, Würzburg 97080, Germany
| | - Andreas Menke
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital of Würzburg, Würzburg 97080, Germany.,Comprehensive Heart Failure Center, University Hospital of Würzburg, Würzburg 97080, Germany.,Interdisciplinary Center for Clinical Research, University of Würzburg, Würzburg 97080, Germany.,Medical Park Chiemseeblick, Bernau-Felden 83233, Germany
| | | | - Niklas Beyersdorf
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg 97078, Germany
| |
Collapse
|
4
|
Ravalec G, Sadoun L, Rohman G, Pacquet W, Hatege-Kimana C, Hollmann C, Desruelle O, Wulfman C. A comparison of conventional and machinable PMMA materials for denture. Comput Methods Biomech Biomed Engin 2020. [DOI: 10.1080/10255842.2020.1815325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- G. Ravalec
- Université de Paris, URB2I, UR 4462, Montrouge, Université Sorbonne Paris Nord, Bobigny, France
| | - L. Sadoun
- Université de Paris, URB2I, UR 4462, Montrouge, Université Sorbonne Paris Nord, Bobigny, France
| | - G. Rohman
- Université Sorbonne Paris Nord, URB2I, UR 4462, Bobigny, France, Université de Paris, Montrouge, France
| | - W. Pacquet
- Université Sorbonne Paris Nord, URB2I, UR 4462, Bobigny, France, Université de Paris, Montrouge, France
| | - C. Hatege-Kimana
- Université Sorbonne Paris Nord, URB2I, UR 4462, Bobigny, France, Université de Paris, Montrouge, France
| | - C. Hollmann
- Université de Paris, URB2I, UR 4462, Montrouge, Université Sorbonne Paris Nord, Bobigny, France
| | - O. Desruelle
- Université Sorbonne Paris Nord, URB2I, UR 4462, Bobigny, France, Université de Paris, Montrouge, France
| | - C. Wulfman
- Université de Paris, URB2I, UR 4462, Montrouge, Université Sorbonne Paris Nord, Bobigny, France
| |
Collapse
|
5
|
Gladow N, Hollmann C, Ramos G, Frantz S, Kerkau T, Beyersdorf N, Hofmann U. Treatment of mice with a ligand binding blocking anti-CD28 monoclonal antibody improves healing after myocardial infarction. PLoS One 2020; 15:e0227734. [PMID: 32298302 PMCID: PMC7161974 DOI: 10.1371/journal.pone.0227734] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 12/29/2019] [Indexed: 01/07/2023] Open
Abstract
Both conventional and regulatory CD4+ T-cells rely on costimulatory signals mediated by cell surface receptors including CD28 for full activation. We showed previously that stimulation of CD4+ Foxp3+ regulatory T-cells by superagonistic anti-CD28 monoclonal antibodies (mAb) improves myocardial healing after experimental myocardial infarction (MI). However, the effect of ligand binding blocking anti-CD28 monoclonal antibodies has not yet been tested in this context. We hypothesize that ligand blocking anti-CD28 mAb treatment might favorably impact on healing after MI by limiting the activation of conventional CD4+ T-cells. Therefore, we studied the therapeutic effect of the recently characterized mAb E18 which blocks ligand binding to CD28 in a mouse permanent coronary ligation model. E18 or an irrelevant control mAb was applied once on day two after myocardial infarction to wildtype mice. Echocardiography was performed on day 7 after MI. E18 treatment improved the survival and reduced the incidence of left ventricular ruptures after experimental myocardial infarction. Accordingly, although we found no difference in infarct size, there was significantly less left ventricular dilation after E18 treatment in surviving animals as determined by echocardiography at day 7 after MI. In sham operated control mice neither antibody had an impact on body weight, survival, and echocardiographic parameters. Mechanistically, compared to control immunoglobulin, E18 treatment reduced the number of CD4+ T-cells and monocytes/macrophages within the infarct and periinfarct zone on day 5. This was accompanied by an upregulation of arginase which is a marker for alternatively differentiated macrophages. The data indicate that CD28-dependent costimulation of CD4+ T-cells impairs myocardial healing and anti-CD28 antibody treatment constitutes a potentially clinically translatable approach to improve the outcome early after MI.
Collapse
Affiliation(s)
- Nadine Gladow
- Comprehensive Heart Failure Center, University Hospital Würzburg, Würzburg, Germany
- * E-mail:
| | - Claudia Hollmann
- Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Gustavo Ramos
- Comprehensive Heart Failure Center, University Hospital Würzburg, Würzburg, Germany
- Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
| | - Stefan Frantz
- Comprehensive Heart Failure Center, University Hospital Würzburg, Würzburg, Germany
- Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
| | - Thomas Kerkau
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Niklas Beyersdorf
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Ulrich Hofmann
- Comprehensive Heart Failure Center, University Hospital Würzburg, Würzburg, Germany
- Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
| |
Collapse
|
6
|
Coetzee E, Gray R, Hollmann C, Enslin NJM, Coetzee JF. Anaesthetic management of a three-month-old baby for cervical limited dorsal myeloschisis repair using propofol and alfentanil infusions guided by pharmacokinetic simulation software: A case report. South Afr J Anaesth Analg 2019. [DOI: 10.36303/sajaa.2019.25.6.a5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We present an uncommon case of limited dorsal myeloschisis in a 3-month-old infant requiring repair guided by intraoperative neuromonitoring (IONM) and therefore avoidance of volatile anaesthetic agents. The case presented challenges in positioning, airway management, a lack of age appropriate pharmacokinetic models in target-controlled infusion (TCI) syringe pumps and unavailability of remifentanil, considered to be an essential drug in this setting. We overcame these challenges using manually controlled infusions of propofol and alfentanil guided by pharmacokinetic simulation software (Stelsim).
Collapse
|
7
|
Hollmann C, Wiese T, Dennstädt F, Fink J, Schneider-Schaulies J, Beyersdorf N. Translational Approaches Targeting Ceramide Generation From Sphingomyelin in T Cells to Modulate Immunity in Humans. Front Immunol 2019; 10:2363. [PMID: 31681273 PMCID: PMC6798155 DOI: 10.3389/fimmu.2019.02363] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 09/19/2019] [Indexed: 12/12/2022] Open
Abstract
In T cells, as in all other cells of the body, sphingolipids form important structural components of membranes. Due to metabolic modifications, sphingolipids additionally play an active part in the signaling of cell surface receptors of T cells like the T cell receptor or the co-stimulatory molecule CD28. Moreover, the sphingolipid composition of their membranes crucially affects the integrity and function of subcellular compartments such as the lysosome. Previously, studying sphingolipid metabolism has been severely hampered by the limited number of analytical methods/model systems available. Besides well-established high resolution mass spectrometry new tools are now available like novel minimally modified sphingolipid subspecies for click chemistry as well as recently generated mouse mutants with deficiencies/overexpression of sphingolipid-modifying enzymes. Making use of these tools we and others discovered that the sphingolipid sphingomyelin is metabolized to ceramide to different degrees in distinct T cell subpopulations of mice and humans. This knowledge has already been translated into novel immunomodulatory approaches in mice and will in the future hopefully also be applicable to humans. In this paper we are, thus, summarizing the most recent findings on the impact of sphingolipid metabolism on T cell activation, differentiation, and effector functions. Moreover, we are discussing the therapeutic concepts arising from these insights and drugs or drug candidates which are already in clinical use or could be developed for clinical use in patients with diseases as distant as major depression and chronic viral infection.
Collapse
Affiliation(s)
- Claudia Hollmann
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Teresa Wiese
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Fabio Dennstädt
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| | - Julian Fink
- Institute of Organic Chemistry, University of Würzburg, Würzburg, Germany
| | | | - Niklas Beyersdorf
- Institute for Virology and Immunobiology, University of Würzburg, Würzburg, Germany
| |
Collapse
|
8
|
Hollmann C, Werner S, Avota E, Reuter D, Japtok L, Kleuser B, Gulbins E, Becker KA, Schneider-Schaulies J, Beyersdorf N. Inhibition of Acid Sphingomyelinase Allows for Selective Targeting of CD4+Conventional versus Foxp3+Regulatory T Cells. J I 2016; 197:3130-3141. [DOI: 10.4049/jimmunol.1600691] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 08/20/2016] [Indexed: 01/01/2023]
|
9
|
Dyke JP, Sondhi D, Voss HU, Yohay K, Hollmann C, Mancenido D, Kaminsky SM, Heier LA, Rudser KD, Kosofsky B, Casey BJ, Crystal RG, Ballon D. Brain Region-Specific Degeneration with Disease Progression in Late Infantile Neuronal Ceroid Lipofuscinosis (CLN2 Disease). AJNR Am J Neuroradiol 2016; 37:1160-9. [PMID: 26822727 DOI: 10.3174/ajnr.a4669] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 11/30/2015] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Late infantile neuronal ceroid lipofuscinosis (CLN2 disease) is a uniformly fatal lysosomal storage disease resulting from mutations in the CLN2 gene. Our hypothesis was that regional analysis of cortical brain degeneration may identify brain regions that are affected earliest and most severely by the disease. MATERIALS AND METHODS Fifty-two high-resolution 3T MR imaging datasets were prospectively acquired on 38 subjects with CLN2. A retrospective cohort of 52 disease-free children served as a control population. The FreeSurfer software suite was used for calculation of cortical thickness. RESULTS An increased rate of global cortical thinning in CLN2 versus control subjects was the primary finding in this study. Three distinct patterns were observed across brain regions. In the first, subjects with CLN2 exhibited differing rates of cortical thinning versus age. This was true in 22 and 26 of 34 regions in the left and right hemispheres, respectively, and was also clearly discernable when considering brain lobes as a whole and Brodmann regions. The second pattern exhibited a difference in thickness from healthy controls but with no discernable change with age (9 left hemispheres, 5 right hemispheres). In the third pattern, there was no difference in either the rate of cortical thinning or the mean cortical thickness between groups (3 left hemispheres, 3 right hemispheres). CONCLUSIONS This study demonstrates that CLN2 causes differential rates of degeneration across the brain. Anatomic and functional regions that degenerate sooner and more severely than others compared with those in healthy controls may offer targets for directed therapies. The information gained may also provide neurobiologic insights regarding the mechanisms underlying disease progression.
Collapse
Affiliation(s)
- J P Dyke
- From the Departments of Radiology (J.P.D., H.U.V., L.A.H., D.B.)
| | - D Sondhi
- Genetic Medicine (D.S., C.H., D.M., S.M.K., R.G.C., D.B.)
| | - H U Voss
- From the Departments of Radiology (J.P.D., H.U.V., L.A.H., D.B.)
| | | | - C Hollmann
- Genetic Medicine (D.S., C.H., D.M., S.M.K., R.G.C., D.B.)
| | - D Mancenido
- Genetic Medicine (D.S., C.H., D.M., S.M.K., R.G.C., D.B.)
| | - S M Kaminsky
- Genetic Medicine (D.S., C.H., D.M., S.M.K., R.G.C., D.B.)
| | - L A Heier
- From the Departments of Radiology (J.P.D., H.U.V., L.A.H., D.B.)
| | - K D Rudser
- Division of Biostatistics (K.D.R.), Clinical and Translational Science Institute, University of Minnesota, Minneapolis, Minnesota
| | | | - B J Casey
- Psychiatry (B.J.C.), Weill Cornell Medical College, New York, New York
| | - R G Crystal
- Genetic Medicine (D.S., C.H., D.M., S.M.K., R.G.C., D.B.)
| | - D Ballon
- From the Departments of Radiology (J.P.D., H.U.V., L.A.H., D.B.) Genetic Medicine (D.S., C.H., D.M., S.M.K., R.G.C., D.B.)
| |
Collapse
|
10
|
Groh J, Klein I, Hollmann C, Wettmarshausen J, Klein D, Martini R. CSF-1-activated macrophages are target-directed and essential mediators of Schwann cell dedifferentiation and dysfunction in Cx32-deficient mice. Glia 2015; 63:977-86. [PMID: 25628221 DOI: 10.1002/glia.22796] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [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: 10/16/2014] [Revised: 01/08/2015] [Accepted: 01/09/2015] [Indexed: 12/26/2022]
Abstract
We investigated connexin 32 (Cx32)-deficient mice, a model for the X-linked form of Charcot-Marie-Tooth neuropathy (CMT1X), regarding the impact of low-grade inflammation on Schwann cell phenotype. Whereas we previously identified macrophages as amplifiers of the neuropathy, we now explicitly focus on the impact of the phagocytes on Schwann cell dedifferentiation, a so far not-yet addressed disease-related mechanism for CMT1X. Using mice heterozygously deficient for Cx32 and displaying both Cx32-positive and -negative Schwann cells in one and the same nerve, we could demonstrate that macrophage clusters rather than single macrophages precisely associate with mutant but not with Cx32-positive Schwann cells. Similarly, in an advanced stage of Schwann cell perturbation, macrophage clusters were strongly associated with NCAM- and L1-positive, dedifferentiated Schwann cells. To clarify the role of macrophages regarding Schwann cell dedifferentiation, we generated Cx32-deficient mice additionally deficient for the macrophage-directed cytokine colony-stimulating factor (CSF)-1. In the absence of CSF-1, Cx32-deficient Schwann cells not only showed the expected amelioration in myelin preservation but also failed to upregulate the Schwann cell dedifferentiation markers NCAM and L1. Another novel and unexpected finding in the double mutants was the retained activation of ERK signaling, a pathway which is detrimental for Schwann cell homeostasis in myelin mutant models. Our findings demonstrate that increased ERK signaling can be compatible with the maintenance of Schwann cell differentiation and homeostasis in vivo and identifies CSF-1-activated macrophages as crucial mediators of detrimental Schwann cell dedifferentiation in Cx32-deficient mice.
Collapse
Affiliation(s)
- Janos Groh
- Department of Neurology, Developmental Neurobiology, University Hospital Wuerzburg, Wuerzburg
| | | | | | | | | | | |
Collapse
|
11
|
Dyke JP, Sondhi D, Voss HU, Shungu DC, Mao X, Yohay K, Worgall S, Hackett NR, Hollmann C, Yeotsas ME, Jeong AL, Van de Graaf B, Cao I, Kaminsky SM, Heier LA, Rudser KD, Souweidane MM, Kaplitt MG, Kosofsky B, Crystal RG, Ballon D. Assessment of disease severity in late infantile neuronal ceroid lipofuscinosis using multiparametric MR imaging. AJNR Am J Neuroradiol 2012; 34:884-9. [PMID: 23042927 DOI: 10.3174/ajnr.a3297] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE LINCL is a uniformly fatal lysosomal storage disease resulting from mutations in the CLN2 gene that encodes for tripeptidyl peptidase 1, a lysosomal enzyme necessary for the degradation of products of cellular metabolism. With the goal of developing quantitative noninvasive imaging biomarkers sensitive to disease progression, we evaluated a 5-component MR imaging metric and tested its correlation with a clinically derived disease-severity score. MATERIALS AND METHODS MR imaging parameters were measured across the brain, including quantitative measures of the ADC, FA, nuclear spin-spin relaxation times (T2), volume percentage of CSF (%CSF), and NAA/Cr ratios. Thirty MR imaging datasets were prospectively acquired from 23 subjects with LINCL (2.5-8.4 years of age; 8 male/15 female). Whole-brain histograms were created, and the mode and mean values of the histograms were used to characterize disease severity. RESULTS Correlation of single MR imaging parameters against the clinical disease-severity scale yielded linear regressions with R2 ranging from 0.25 to 0.70. Combinations of the 5 biomarkers were evaluated by using PCA. The best combination included ADC, %CSF, and NAA/Cr (R2=0.76, P<.001). CONCLUSIONS The multiparametric disease-severity score obtained from the combination of ADC, %CSF, and NAA/Cr whole-brain MR imaging techniques provided a robust measure of disease severity, which may be useful in clinical therapeutic trials of LINCL in which an objective assessment of therapeutic response is desired.
Collapse
Affiliation(s)
- J P Dyke
- Department of Radiology, Weill Cornell Medical College, New York, New York 10021, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Clarke S, Nadeau J, Bahcheli D, Zhang Z, Hollmann C. Quantum dots as phototoxic drugs and sensors of specific metabolic processes in living cells. Conf Proc IEEE Eng Med Biol Soc 2012; 2006:504-7. [PMID: 17282227 DOI: 10.1109/iembs.2005.1616458] [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] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
When conjugated to CdSe/ZnS nanocrystals (quantum dots), the nucleobase adenine and the neurotransmitter dopamine quench fluorescence emission from in a manner strongly dependent upon the size of the quantum dot. The degree of quenching serves to predict the efficiency with which the conjugates are able to enter living cells. Along with quenching, the presence of specific receptors on the cells is necessary for QD binding, entry, and phototoxicity. Toxicity is manifested by opening of large membrane pores and by oxidative DNA damage, and does not require the release of Cd<sup>+2</sup>. In bacterial cells, light exposure is necessary for uptake, and procedures to reduce toxicity eliminate labeling. In mammalian cells, antioxidants prevent toxicity but not QD uptake, leading to QD-loaded cells that are nonfluorescent before light exposure. These findings provide a general procedure for rational design of nanoparticle-based photosensitizing drugs and for "off-on" fluorescent labels.
Collapse
Affiliation(s)
- S Clarke
- Dept. of Biomed. Eng., McGill Univ., Montreal, Que
| | | | | | | | | |
Collapse
|
13
|
Abstract
Metastases are the major cause of cancer-related deaths in patients with solid epithelial malignancies, such as breast, colorectal and prostate carcinomas. Hematogenous spreading of tumor cells from a primary tumor can be considered as a crucial step in the metastasis cascade leading eventually to the formation of clinically manifest metastases. Consequently, as shown in recent studies, the detection of disseminated tumor cells in peripheral blood might be of clinical relevance with respect to individual patient prognosis and staging or monitoring of therapy. However, the rarity of disseminated tumor cells in peripheral blood renders the application of sensitive techniques mandatory for their detection. The emergence of highly sophisticated reverse transciptase-polymerase chain reaction (RT-PCR) assays, combining a preanalytical enrichment step with the assessment of multiple molecular tumor markers expressed in disseminated tumor cells, provides a powerful tool in detecting disseminated tumor cells with high sensitivity and specificity. This review will discuss currently used tumor markers as well as experimental means to enhance the sensitivity and specificity of RT-PCR assays to detect disseminated tumor cells in the peripheral blood of patients with breast, colorectal, and prostate cancers, and their clinical relevance assessed in recent studies.
Collapse
|
14
|
Worgall S, Kekatpure MV, Heier L, Ballon D, Dyke JP, Shungu D, Mao X, Kosofsky B, Kaplitt MG, Souweidane MM, Sondhi D, Hackett NR, Hollmann C, Crystal RG. Neurological deterioration in late infantile neuronal ceroid lipofuscinosis. Neurology 2007; 69:521-35. [PMID: 17679671 DOI: 10.1212/01.wnl.0000267885.47092.40] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Late infantile neuronal ceroid lipofuscinosis (LINCL) is associated with progressive degeneration of the brain and retina starting in early childhood. METHODS Thirty-two individual neurologic, ophthalmologic, and CNS imaging (MRI and MRS) assessments of 18 children with LINCL were analyzed. Disease severity was followed by two rating scales, one previously established but modified to solely assess the brain and exclude the retinal disease (modified Hamburg LINCL scale), and a newly developed scale, with expanded evaluation of the CNS impairment (Weill Cornell LINCL scale). RESULTS For the 18 children, the Weill Cornell scale yielded a closer correlation with both age and time since initial clinical manifestation of the disease than did the modified Hamburg scale. There were no significant differences as a function of age or time since initial manifestation of the disease in the rating scales among the most frequent CLN2 mutations (G3556C, 56% of all alleles or C3670T, 22% of all alleles). Measurements of cortical MRS N-acetyl-aspartate content, MRI ventricular, gray matter and white matter volume, and cortical apparent diffusion coefficient correlated to a variable degree with the age of the children and the time since initial clinical manifestation of the disease. All imaging measurements correlated better with the Weill Cornell CNS scale compared to the modified Hamburg LINCL scale. CONCLUSION The data suggest that the Weill Cornell late infantile neuronal ceroid lipofuscinosis (LINCL) scale, together with several of the MRI measurements, may be useful in the assessment of severity and progression of LINCL and for the evaluation of novel therapeutic strategies.
Collapse
Affiliation(s)
- S Worgall
- Department of Genetic Medicine, Weill Medical College of Cornell University, New York, NY 10021, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Zhang X, Li L, Jung J, Xiang S, Hollmann C, Choi YS. The distinct roles of T cell-derived cytokines and a novel follicular dendritic cell-signaling molecule 8D6 in germinal center-B cell differentiation. J Immunol 2001; 167:49-56. [PMID: 11418631 DOI: 10.4049/jimmunol.167.1.49] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Germinal center-B (GC-B) cells differentiate into memory B cells and plasma cells (PC) through interaction with T cells and follicular dendritic cells (FDC). Activated T cell and FDC play distinct roles in this process. The detailed kinetic experiments revealed that cytokines secreted by activated T cells determined the pathway of GC-B cell differentiation. IL-4 directs GC-B cells to differentiate into memory B cells, whereas IL-10 steers them into PC. FDC/HK cells do not direct either pathway, but provide signals for proliferation of GC-B cells. A novel FDC-signaling molecule 8D6 (FDC-SM-8D6) produced by FDC augments PC generation in the GC. FDC-SM-8D6-specific mAb blocked PC generation and IgG secretion but not memory B cell proliferation. COS cells expressing FDC-SM-8D6 enhanced GC-B cell proliferation and Ab secretion, which was blocked by mAb 8D6. In the cultures with B cell subsets, PC generation was inhibited by mAb 8D6 in the cultures with CD27(+) B cells but not in the culture with CD27(-) B cells, suggesting that CD27(+) PC precursor is the specific target of FDC-SM-8D6 stimulation.
Collapse
Affiliation(s)
- X Zhang
- Laboratory of Cellular Immunology, Alton Ochsner Medical Foundation, New Orleans, LA 70121, USA
| | | | | | | | | | | |
Collapse
|
16
|
Affiliation(s)
- E Endl
- Division of Molecular Immunology, Research Center Borstel, Germany
| | | | | |
Collapse
|
17
|
Schnittger L, Hollmann C, Diemer U, Boguslawski K, Ahmed JS. Proliferation and cytokine profile of T. annulata-infected ovine, caprine, and bovine lymphoblastoid cells. Ann N Y Acad Sci 2001; 916:676-80. [PMID: 11193699 DOI: 10.1111/j.1749-6632.2000.tb05360.x] [Citation(s) in RCA: 4] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
T. annulata, the causative agent of tropical theileriosis in cattle, can also infect ovine and caprine leukocytes in vitro. In vivo studies showed that this parasite causes a mild infection in both these animal species, and in sheep merozoite stage development seems to be inhibited. Since the nature of T. annulata infected caprine and ovine cells is not known, all three cell lines were karyotyped and phenotypically characterized by flow cytometry. They all express mRNA of cytokines IL-1 alpha, IL-1 beta, IL-8, and TNF-alpha, but not of IFN-gamma, IL-2, and IL-4. In contrast, IL-6 mRNA was expressed in the cattle cell line only, while mRNA of IL-10 was exclusively produced by the sheep cell line. The observed differences in cytokine mRNA expression may be responsible for the different pathogenesis of T. annulata infection in cattle and sheep.
Collapse
Affiliation(s)
- L Schnittger
- Forschungszentrum Borstel Parkallee 22, 23845 Borstel, Germany
| | | | | | | | | |
Collapse
|
18
|
Hollmann C, Schürmann M, Preut H, Eilbracht P. (1R*,11R*)-Bicyclo[9.4.1]hexadecane-12,16-dione. Acta Crystallogr C 2000; 56:E215. [PMID: 15263157 DOI: 10.1107/s010827010000528x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2000] [Accepted: 04/05/2000] [Indexed: 11/11/2022] Open
Abstract
The title compound, C(16)H(26)O(2), (I), prepared by oxidation of (1R*,11R*)-12-hydroxybicyclo[9.4.1]hexadecan-16-one using pyridinium dichromate, has a trans configuration of the two fused rings and represents an interesting precursor for the synthesis of macrocyclic structures.
Collapse
Affiliation(s)
- C Hollmann
- Fachbereich Chemie, Universität Dortmund, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
| | | | | | | |
Collapse
|
19
|
Eilbracht P, Bärfacker L, Buss C, Hollmann C, Kitsos-Rzychon BE, Kranemann CL, Rische T, Roggenbuck R, Schmidt A. Tandem Reaction Sequences under Hydroformylation Conditions: New Synthetic Applications of Transition Metal Catalysis. Chem Rev 1999; 99:3329-66. [PMID: 11749518 DOI: 10.1021/cr970413r] [Citation(s) in RCA: 412] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- P Eilbracht
- Fachbereich Chemie, Organische Chemie I, Universität Dortmund, Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Abstract
The humoral immune response constitutes an efficient system to protect the organism against diseases caused by invading pathogens. To guarantee a highly efficient defence, the humoral immune system has to be tightly regulated. Two cell subsets in particular, T cells and follicular dendritic cells (FDCs), contribute to the success of these regulation processes. Whereas the particular role of T cells is the elimination of autoreactive clones, the main role of FDCs is to present unprocessed antigen and check B-cell clones for higher affinity. B-cell clones unsuited for improved humoral immune response will be specifically killed. Involvement of Fas-mediated apoptosis might be an additional tool not only in T-cell-mediated regulation, but also in FDC-B cell interaction in the germinal centre.
Collapse
|
21
|
Cartier R, Dagenais F, Hollmann C, Cambron H, Buluran J. Effects of cyclosporine A on the regenerating endothelium following direct arterial injury. Transplant Proc 1997; 29:1886-90. [PMID: 9142312 DOI: 10.1016/s0041-1345(97)00108-5] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
MESH Headings
- Acetylcholine/pharmacology
- Animals
- Aorta, Thoracic/injuries
- Aorta, Thoracic/physiology
- Blood Platelets/physiology
- Cyclosporine/pharmacology
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/injuries
- Endothelium, Vascular/physiology
- Histamine/pharmacology
- In Vitro Techniques
- Isometric Contraction/drug effects
- Isometric Contraction/physiology
- Male
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/injuries
- Muscle, Smooth, Vascular/physiology
- Potassium Chloride/pharmacology
- Rats
- Rats, Sprague-Dawley
- Regeneration/drug effects
- Serotonin/pharmacology
- Vasoconstriction
- Vasodilation
Collapse
Affiliation(s)
- R Cartier
- Department of Surgery, Montreal Heart Institute, Quebec, Canada
| | | | | | | | | |
Collapse
|
22
|
Abstract
BACKGROUND Calcium-channel blockers have been reported to improve myocardial recovery after ischemia-reperfusion, but their effects on coronary blood flow regulation remain to be defined. Experiments were designed to evaluate the effects of calcium antagonists on coronary artery vasoregulation exposed to ischemia-reperfusion. METHODS Three groups of hearts (n = 6) were pretreated with a 10-minute infusion of either diltiazem, verapamil, or nifedipine at concentrations of 10(-9) mol/L to 10(-6) mol/L and exposed to 30 minutes of no-flow ischemia and 45 minutes of reperfusion. Another group (n = 6) received no pretreatment and was used as control. Endothelium-dependent and -independent relaxations were tested by assessing coronary flow increase to 5-hydroxytryptamine (10(-6) mol/L) and sodium nitroprusside (10(-5) mol/L) infusion, respectively. Left ventricular pressure, its first derivative, and coronary basal flow were recorded before and after ischemia as well as during calcium antagonist infusion. RESULTS Endothelium-dependent relaxation after ischemia was significantly improved with all three drugs in a dose-dependent fashion; nifedipine was found to be the more potent. Endothelium-independent relaxation was also significantly preserved with calcium antagonists regardless of the type, whereas left ventricular hemodynamics were not. During perfusion, nifedipine was found to have the most negative inotropic effect and to be the most potent vasodilator on the coronary circulation. Diltiazem was the less effective drug on both left ventricular hemodynamics and coronary circulation. CONCLUSIONS This study indicates that preischemic infusion of calcium antagonists enhance endothelium-dependent and -independent coronary artery relaxation in the isolated rat heart model in a dose- and drug-dependent fashion. This can be achieved at low doses without affecting left ventricular hemodynamics and should contribute to preserve coronary artery autoregulation.
Collapse
Affiliation(s)
- F Dagenais
- Department of Cardiovascular Surgery, Montreal Heart Institute, Quebec, Canada
| | | | | | | |
Collapse
|
23
|
Matthes M, Hollmann C, Bertuleit H, Kühl M, Thiele HG, Haag F, Koch-Nolte F. "Natural" RT6-1 and RT6-2 "knock-out" mice. Adv Exp Med Biol 1997; 419:271-4. [PMID: 9193665] [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: 02/04/2023]
Abstract
We have screened different mouse strains-including strains with enhanced susceptibility for autoimmune diseases-for deviations of Rt6 gene expression by RT-PCR. Most strains expressed varying amounts of Rt6-1 and Rt6-2. NZW mice, however, do not show any detectable Rt6-2 gene transcripts. BxSB mice show a near complete absence of Rt6-1 gene transcripts. Southern blot and sequence analyses revealed that NZW mice have suffered a deletion of the Rt6.2 gene while the Rt6-1 gene of BxSB mice has been inactivated by a premature stop codon. Thus, these mouse strains represent natural Rt6-2 and Rt6-1 single-gene 'knock-out's, respectively. Since the NZW mouse does not show any gross immunological abnormalities, loss of the Rt6-2 gene by itself is not associated with any obvious immunological phenotype. However, crosses between NZW and certain other mouse strains, e.g. (NZW x NWB)F1 and (NZW x SB)F1 animals, develop a systemic autoimmune disease reminiscent of human lupus erythematosus. Moreover, the BxSB mouse strain is considered to be an independent model for the same disease. It will be of interest to determine whether these spontaneous Rt6 gene defects constitute part of the polygenetic contribution to autoimmune disease in these animals.
Collapse
Affiliation(s)
- M Matthes
- Department of Immunology, University Hospital, Hamburg, Germany
| | | | | | | | | | | | | |
Collapse
|
24
|
Kuhlenbäumer G, Rothenburg S, Matthes M, Hollmann C, Wingender E, Thiele HG, Koch-Nolte F, Haag F. Expression of the RT6 mono(ADP-ribosyl)transferases is regulated by two promoter regions. Adv Exp Med Biol 1997; 419:265-70. [PMID: 9193664 DOI: 10.1007/978-1-4419-8632-0_34] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/10/2023]
Abstract
The structure of the RT6 mono(ADP-ribosyl)transferase gene was studied. Analysis of cDNA clones revealed eight exons and suggested two independent transcriptional start sites. The existence of the downstream initiation site was confirmed by S1-nuclease protection and localized to position +29 of exon 2. The corresponding 5' flanking regions were found to contain typical promoter structures such as TATA- and CCAAT-boxes. Comparison with sequences deposited in the TRANSFAC database of transcription factor binding sites revealed few putative regulatory elements in the region associated with exon 1 (promoter 1). In contrast, several elements contained in the regulatory regions of other T cell-specific genes, such as ets, lyf-1 and ikaros were found in in promoter 2. Analysis of RT6-transcripts showed this region to be the most active promoter in spleen cells of adult rats. Finally, transient transfection assays with reporter gene constructs showed promoter 2 to mediate T-cell specific transcription.
Collapse
Affiliation(s)
- G Kuhlenbäumer
- Department of Immunology, University Hospital Hamburg-Eppendorf, Germany
| | | | | | | | | | | | | | | |
Collapse
|
25
|
Lien CA, Hemmings HC, Belmont MR, Abalos A, Hollmann C, Kelly RE. A comparison: the efficacy of sevoflurane-nitrous oxide or propofol-nitrous oxide for the induction and maintenance of general anesthesia. J Clin Anesth 1996; 8:639-43. [PMID: 8982891 DOI: 10.1016/s0952-8180(96)00172-9] [Citation(s) in RCA: 20] [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: 02/03/2023]
Abstract
STUDY OBJECTIVE To compare sevoflurane-nitrous oxide with propofol-nitrous oxide for the induction and maintenance of anesthesia, and to determine the rates of recovery following each anesthetic. DESIGN Randomized, controlled study. SETTING Teaching hospital. PATIENTS 50 ASA physical status I and II patients, ranging in age from 18 to 70 years. INTERVENTIONS General anesthesia was induced with either sevoflurane or propofol and maintained with 60% to 70% nitrous oxide and either sevoflurane or a propofol infusion and supplemental fentanyl. At the conclusion of surgery, the oxygen flow was increased to 6 L/min and all anesthetics were discontinued simultaneously. Patients were monitored for the nature and speed of induction and emergency from anesthesia. MEASUREMENTS AND MAIN RESULTS Induction of anesthesia was significantly slower in the sevoflurane group than in the propofol group (2.0 +/- 1.1 vs. 0.8 +/- 0.5 min, respectively). The ease of induction and the time required for emergence from anesthesia were the same in both study groups (eye opening: 9.0 +/- 4.4 min vs. 8.0 +/- 5.0 min; following commands: 11.2 +/- 5.0 min vs. 9.8 +/- 6.9 min; extubation: 9.1 +/- 4.5 min vs. 8.6 vs. 5.1 min in the sevoflurane and propofol groups, respectively). Patients in the sevoflurane group experienced nausea and vomiting more frequently than patients in the propofol group (13 and 5 patients vs. 3 and 0 patients in the sevoflurane and propofol groups, respectively), which were not related to the administration of neostigmine or intraoperative opioids. CONCLUSION Sevoflurane allows for rapid inhalation induction of, and emergence from, general anesthesia.
Collapse
Affiliation(s)
- C A Lien
- Department of Anesthesiology, New York Hospital-Cornell Medical Center, New York 10021, USA
| | | | | | | | | | | |
Collapse
|
26
|
Hollmann C, Haag F, Schlott M, Damaske A, Bertuleit H, Matthes M, Kühl M, Thiele HG, Koch-Nolte F. Molecular characterization of mouse T-cell ecto-ADP-ribosyltransferase Rt6: cloning of a second functional gene and identification of the Rt6 gene products. Mol Immunol 1996; 33:807-17. [PMID: 8811076 DOI: 10.1016/0161-5890(96)00008-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [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: 02/02/2023]
Abstract
RT6 is an enzymatically active GPI-anchored membrane protein that was originally discovered in the rat as a peripheral T cell alloantigen. It has attracted interest as an activation antigen and because defective RT6-expression coincides with increased susceptibility for autoimmune type I diabetes in the BB rat. Southern blot analyses indicate that the rat carries a single copy RT6 gene whereas the mouse carries a duplication of the homologous locus. We had previously cloned and sequenced a RT6-homologous cDNA from BALB/c mouse spleen. We now report the cloning and characterization of a second RT6-homologue from BALB/c and 129/Sv mice. The two mouse Rt6 genes (designated Rt6-1 and Rt6-2) encode similar open reading frames that are disrupted by conserved introns. The nucleotide sequences of the Rt6-1 and Rt6-2 coding regions show 87% sequence identity, the deduced amino acid sequences 79% identity. The amino acid sequences reveal significant similarity to recently cloned ADP-ribosylating ectoenzymes from rabbit and human skeletal muscle as well as chicken bone marrow cells. RT-PCR analyses reveal that the two Rt6 genes are differentially expressed in distinct inbred mouse strains and that their transcripts are properly processed. Western blot analyses demonstrate that the respective gene products are released from cells by treatment with PI-PLC. The results further show that both mouse Rt6 genes are translated into GPI-anchored cell surface molecules and that Rt6 gene expression is restricted to peripheral lymphoid tissues.
Collapse
MESH Headings
- Amino Acid Sequence
- Animals
- Antigens, Differentiation, T-Lymphocyte/chemistry
- Antigens, Differentiation, T-Lymphocyte/genetics
- Antigens, Differentiation, T-Lymphocyte/isolation & purification
- Base Sequence
- Blotting, Southern
- Cloning, Molecular
- Cross Reactions
- Histocompatibility Antigens/chemistry
- Histocompatibility Antigens/genetics
- Histocompatibility Antigens/isolation & purification
- Mice
- Mice, Inbred BALB C
- Molecular Sequence Data
- Multigene Family/immunology
- Phosphatidylinositol Diacylglycerol-Lyase
- Phosphoinositide Phospholipase C
- Phosphoric Diester Hydrolases/pharmacology
- Poly(ADP-ribose) Polymerases/chemistry
- Poly(ADP-ribose) Polymerases/genetics
- Poly(ADP-ribose) Polymerases/isolation & purification
- Polymerase Chain Reaction
- Sequence Homology, Amino Acid
- Spleen/immunology
- Transcription, Genetic/immunology
Collapse
Affiliation(s)
- C Hollmann
- Department of Clinical Immunology, University Hospital, Hamburg, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
27
|
|
28
|
Dagenais F, Hollmann C, Buluran J, Cartier R. Clentiazem and diltiazem preserve endothelium-dependent relaxation following global rat heart ischemia. Can J Cardiol 1995; 11:816-22. [PMID: 7585280] [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: 01/26/2023] Open
Abstract
OBJECTIVE To evaluate the effects of the calcium channel blocker diltiazem and its chloride derivative clentiazem on coronary vasoregulation of isolated rat hearts exposed to ischemia-reperfusion. Diltiazem has been reported to prevent postreperfusion myocardial damage but its beneficial effects on coronary blood-flow regulation remain uncertain. METHODS Two groups of hearts were pretreated with a 10 min infusion of either diltiazem (10(-9) to 10(-6) mol/L) or clentiazem (10(-9) to 10(-7) mol/L) (n = 6 for each concentration) and exposed to 30 mins of no-flow ischemia. Another group (n = 6) received no pretreatment and was used as control. Endothelium-dependent and -independent relaxation were tested by assessing coronary flow increase to 5-hydroxytriptamine (10(-6) mol/L) and sodium nitroprusside (10(-5) mol/L) infusions, respectively, and were assessed before and after ischemia-reperfusion. Left ventricular pressure, dP/dt and coronary basal flow were also recorded. Postreperfusion results are expressed as a percentage of pre-ischemic value. Dunnet variance analysis was used to compare means of pretreated groups with the control group. RESULTS Endothelium-dependent relaxation was significantly improved with both drugs. Optimal preservation was obtained with diltiazem 10(-6) mol/L (66 +/- 4%) and clentiazem 10(-7) mol/L (83 +/- 4%), whereas endothelial response was almost abolished in control hearts (6 +/- 11%, P < 0.01). Clentiazem was found to be more potent than diltiazem at low concentration (10(-9) mol/L, clentiazem 89 +/- 13% versus diltiazem 3 +/- 16%, P < 0.05). Optimal endothelium-independent relaxation preservation was achieved at 10(-8) mol/L in both groups (diltiazem 86 +/- 4%, clentiazem 82 +/- 8%, control 47 +/- 10%, P < 0.05). Left ventricular pressure and dP/dt were not affected by any pretreatment. However, postreperfusion coronary basal flow was significantly increased in control hearts. CONCLUSION This study indicated that pre-ischemic infusion of diltiazem and clentiazem enhances endothelium-dependent and -independent coronary artery relaxation following reperfusion in the isolated rat heart model, without affective ventricular hemodynamics, and contributes to preservation of coronary artery autoregulation.
Collapse
Affiliation(s)
- F Dagenais
- Department of Surgery, Montreal Heart Institute, Quebec
| | | | | | | |
Collapse
|
29
|
Koch-Nolte F, Klein J, Hollmann C, Kühl M, Haag F, Gaskins HR, Leiter E, Thiele HG. Defects in the structure and expression of the genes for the T cell marker Rt6 in NZW and (NZB x NZW)F1 mice. Int Immunol 1995; 7:883-90. [PMID: 7547715 DOI: 10.1093/intimm/7.5.883] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Rt6 is a T cell-restricted GPI-anchored membrane protein and a member of the family of mono(ADP-ribosyl)transferases. One of the two murine Rt6 genes is deleted in NZW mice. This finding is reminiscent of the deletion of one of the TCR beta genes in the same mouse strain and it is an intriguing possibility that these gene deletions arose by a common genetic mechanism. The Rt6 locus retained by the NZW mouse (designated Rt6-1) is polymorphic among inbred strains of laboratory mice. The NZW mouse shows several strain-specific restriction fragment length variants in this Rt6 locus and five amino acid substitutions occur in the predicted native Rt6 polypeptide of the NZW mouse relative to the corresponding polypeptides of NZB and BALB/c mice. Whereas transcript levels of the two Rt6 genes appear to be normal in spleen and intestine of NZB mice, the corresponding tissues of NZW mice show reduced levels of transcripts from the Rt6 locus retained in this mouse strain. Moreover, reduced levels of Rt6 mRNA also occur in spleen and intestine of (NZB x NZW)F1 hybrid animals, indicating that F1 animals have inherited a dominant factor from the genetic background of the NZW mouse, resulting in low levels of Rt6 expression. It is conceivable that the alterations in the Rt6 genes of the NZW mouse and/or the factor(s) affecting defective Rt6 expression constitute part of the genetic contribution of the NZW mouse to the autoimmune lupus-like disease in (NZB x NZW)F1 animals.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- F Koch-Nolte
- Department of Immunology, University Hospital, Hamburg, Germany
| | | | | | | | | | | | | | | |
Collapse
|
30
|
Cartier R, Hollmann C, Buluran J, Dagenais F. Effects of modified St Thomas' Hospital solution on coronary artery endothelium dependent relaxation in the isolated rat heart. Can J Cardiol 1995; 11:53-8. [PMID: 7850665] [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: 01/27/2023] Open
Abstract
Addition of magnesium to a preservation solution such as St Thomas's Hospital solution has been shown to improve myocardial preservation. High concentration of magnesium can affect coronary artery endothelial-dependent relaxation. Isolated rat hearts were studied in the Langendorff apparatus to investigate whether magnesium-enriched hyperkalemic cardioplegic solution (HCS) could alter coronary endothelial function. Hearts in group 1 (n = 8) were perfused for 30 mins with a standard hyperkalemic cardioplegic solution (potassium chloride 24 mmol/L). Hearts in group 2 (n = 8) were perfused with modified St Thomas' Hospital solution (MST) containing 16 mmol/L of magnesium chloride and 24 mmol of potassium chloride. The endothelium dependent and endothelium independent relaxation of the coronary arteries were respectively assessed by infusing 5-hydroxytryptamine (5-HT) (1 x 10(-6) mol/L) and sodium nitroprusside (SNP) (1 x 10(-5) mol/L) before and after perfusion of cardioplegic solutions. Hearts in group 2 showed a reduction of the 5-HT-induced coronary flow increase following the MST exposure (before, 8.66 +/- 0.86 mL/min; after, 5.66 +/- 0.97 mL/min, P < 0.01) whereas hearts in group 1 were not significantly affected (before, 8.00 +/- 0.68 mL/min; after, 6.99 +/- 1.02 mL/min, not significant), suggesting endothelial dysfunction in the former. Coronary flow response to SNP was not affected in either group.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- R Cartier
- Department of Cardiovascular Surgery, Montreal Heart Institute, Quebec
| | | | | | | |
Collapse
|
31
|
Koch-Nolte F, Hollmann C, Kühl M, Haag F, Prochazka M, Leiter E, Thiele HG. Molecular polymorphism in the Rt6 genes of laboratory mice correlates with the allotypes of the H1 minor histocompatibility system. Immunogenetics 1995; 41:152-5. [PMID: 7806289 DOI: 10.1007/bf00182329] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- F Koch-Nolte
- Dept. Immunology University Hospital, Hamburg, Germany
| | | | | | | | | | | | | |
Collapse
|
32
|
McNamara JR, Hollmann C, Riegel T. A preliminary study of the usefulness of the Behavior Assessment Systems for Children in the evaluation of mental health needs in a Head Start population. Psychol Rep 1994; 75:1195-201. [PMID: 7892382 DOI: 10.2466/pr0.1994.75.3.1195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
122 parents and 18 teachers rated Head Start children on the preschool version of the Behavioral Assessment System for Children. Parents tended to rate their children as having greater problem scores than did their teacher, but both ratings, when compared to general norms, were within normal limits. Low to moderate correlations were found for the same scales on Parent and Teacher forms. Teachers rated children in the center program as having fewer problems than their home-based peers, while parents evaluated center children as having better adaptive behavior than children in the home-based program. Boys had more clinical problems than girls, while girls were rated as showing more adaptive behavior than boys. The usefulness and need for further research on this assessment are mentioned.
Collapse
Affiliation(s)
- J R McNamara
- Department of Psychology, Ohio University, Athens 45701-2979
| | | | | |
Collapse
|
33
|
Abstract
Chronic exposure to cyclosporine affects vascular reactivity. Experiments were designed to characterize the endothelium-dependent and endothelium-independent vascular reactivity of rats exposed to oral cyclosporin A (CyA). Two subsets of rats (n = 6) were treated with CyA (20 mg/kg/day) and olive oil (cyclosporine vehicle), respectively, for a period of 8 weeks. Aortic rings (4-5 mm) were suspended for isometric force measurement in organ chambers containing Krebs Ringer solution (37 degrees C, 95% O2, 5% CO2). The maximal endothelium-dependent relaxation to cumulative doses of acetylcholine was significantly decreased in the CyA-treated aortic rings compared to olive oil-treated ones (data expressed as percent of initial contraction; CyA, 50% +/- 3% versus olive oil, 37% +/- 7%; p < 0.05). However, endothelium-dependent relaxations to histamine and adenosine diphosphate and endothelium-independent relaxation to sodium nitroprusside were not affected in both groups. An endothelium-dependent contraction to serotonin and aggregating platelets were observed in the CyA group, but not in the control group. The endothelium-independent contraction to norepinephrine was enhanced in the CyA group (CyA ED50, log -7.66 +/- 0.18 mol/L versus olive oil ED50, log -7.01 +/- 0.11 mol/L; p < 0.01). These experiments suggest that chronic exposure to cyclosporine A could contribute to augmenting vascular tone by (1) decreased release of endothelial relaxing factor mediated by muscarinic receptors, (2) increased production of endothelium-related constricting factor mediated by serotoninergic receptors, and (3) greater vascular smooth muscle sensitivity to circulating catecholamine.
Collapse
MESH Headings
- Acetylcholine/pharmacology
- Adenosine Diphosphate/pharmacology
- Administration, Oral
- Animals
- Aorta/drug effects
- Aorta/pathology
- Aorta/physiopathology
- Cholesterol/blood
- Cyclosporine/pharmacology
- Dose-Response Relationship, Drug
- Drug Carriers
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/physiopathology
- Histamine/pharmacology
- Isotonic Solutions
- Lipoproteins, LDL/blood
- Lipoproteins, LDL/drug effects
- Male
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiopathology
- Myocardial Contraction/drug effects
- Nitric Oxide
- Nitroprusside/pharmacology
- Olive Oil
- Plant Oils/pharmacology
- Platelet Aggregation/drug effects
- Rats
- Rats, Sprague-Dawley
- Serotonin/pharmacology
- Time Factors
Collapse
Affiliation(s)
- R Cartier
- Department of Cardiovascular Surgery, Montreal Heart Institute, Quebec, Canada
| | | | | | | | | |
Collapse
|
34
|
Blanck TJ, Lee DL, Yasukochi S, Hollmann C, Zhang J. The role of L-type voltage-dependent calcium channels in anesthetic depression of contractility. Adv Pharmacol 1994; 31:207-14. [PMID: 7873412 DOI: 10.1016/s1054-3589(08)60617-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- T J Blanck
- Department of Anesthesiology, Cornell University Medical College, New York, New York 10021
| | | | | | | | | |
Collapse
|
35
|
Cartier R, Hollmann C, Dagenais F, Buluran J, Pellerin M, Leclerc Y. 1993: Effects of University of Wisconsin solution on endothelium-dependent coronary artery relaxation in the rat. Updated in 1994. Ann Thorac Surg 1994; 57:255-7. [PMID: 8279912 DOI: 10.1016/0003-4975(94)90421-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- R Cartier
- Department of Cardiovascular Surgery, Montreal Heart Institute, Quebec, Canada
| | | | | | | | | | | |
Collapse
|
36
|
Haag F, Nolte F, Hollmann C, Thiele HG. Analysis of the gene for the rat T-cell alloantigen RT6: evidence for alternative splicing in the 5' region. Transplant Proc 1993; 25:2784-5. [PMID: 8212234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- F Haag
- Department of Immunology, University Hospital, Hamburg, Germany
| | | | | | | |
Collapse
|
37
|
Abstract
The effects of cold storage and type of preservation solution on coronary endothelial function are not well understood. Experiments were designed to evaluate coronary endothelial-dependent relaxation after a 4-hr cold (4 degrees C) storage in different preservation solutions. Isolated rat hearts were studied in the Langendorff apparatus for coronary endothelial function. After 30 min of stabilization, hearts were arrested with a 10-min perfusion of 4 degrees C crystalloid hyperkalemic cardioplegic solution (CHCS) containing 24 mmol/L of KCl and stored for 4 hr in the following preservation solutions: CHCS, Krebs-Ringer's solution (KR), 0.9% NaCl (NS), and University of Wisconsin solution (UW). A fifth group was perfused and stored in UW solution. Endothelial-dependent and independent coronary artery vasorelaxation were tested, respectively, by infusing 5-hydroxytryptamine (5-HT) (1 x 10(-6) mol/L) and sodium nitroprusside (SNP) (1 x 10(-5) mol/L) before and 30 min after the storage period. In hearts stored in CHCS and KR, the coronary artery flow increase to 5-HT and SNP infusion were not significantly affected. However, in hearts preserved with NS and UW solutions, 5-HT coronary response was significantly decreased, indicating endothelial dysfunction. In addition to these findings, coronary flow increase to SNP infusion was decreased in the group perfused and stored with UW, suggesting smooth muscle damage. These experiments suggest that 4-hr cold storage in NS or UW impairs endothelial-dependent coronary relaxation in the isolated rat heart model.
Collapse
Affiliation(s)
- R Cartier
- Department of Cardiovascular Surgery, Montreal Heart Institute, Quebec, Canada
| | | | | | | | | |
Collapse
|
38
|
Kelly RE, Lien CA, Savarese JJ, Belmont MR, Hartman GS, Russo JR, Hollmann C. Depression of neuromuscular function in a patient during desflurane anesthesia. Anesth Analg 1993; 76:868-71. [PMID: 8466031 DOI: 10.1213/00000539-199304000-00031] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- R E Kelly
- Department of Anesthesiology, Cornell University Medical College, New York Hospital, New York
| | | | | | | | | | | | | |
Collapse
|
39
|
Abstract
Infusions of crystalloid hyperkalemic cardioplegic solutions (CHCSs) are known to impair endothelium-dependent coronary relaxation. This impairment might also be influenced by high perfusion pressure and duration of CHCS infusion. To verify this hypothesis, we designed experiments to study the influence of pressure and duration of CHCS infusion as modulating factors in CHCS-related endothelial impairment. Isolated hearts of Sprague-Dawley rats were studied in a Langendorff apparatus for coronary endothelial function. Hearts (n = 6) were exposed to four different CHCSs containing 12, 24, 40, or 100 mmol/L of potassium chloride (KCl). Endothelial and smooth muscle functions were respectively tested by infusion of 5-hydroxytryptamine (1 x 10(-6) mol/L) and sodium nitroprusside (1 x 10(-5) mol/L) before and after CHCS perfusion. In group I (n = 24), 37 degrees C CHCSs were perfused at 80 cm H2O of pressure for 30 minutes. In group II (n = 24), the same CHCSs were perfused at 160 cm H2O for 30 minutes. In group III (n = 18), CHCSs containing 24, 40, and 100 mmol/L of KCl were infused at 160 cm H2O for 10 minutes. In all groups, response to sodium nitroprusside was unaltered by CHCS infusion, indicating that smooth muscle function was preserved. However, in group II, 5-hydroxytryptamine-induced vasodilation was significantly impaired in hearts perfused with CHCS containing 24 mmol/L of KCl or more, suggesting endothelial damage. This study demonstrates that, in addition to KCl concentration, pressure and duration of infusion are two major determinants in CHCS-mediated endothelial damage.
Collapse
Affiliation(s)
- R Cartier
- Department of Cardiovascular Surgery, Montreal Heart Institute, Quebec, Canada
| | | | | | | |
Collapse
|
40
|
Cartier R, Hollmann C, Dagenais F, Buluran J, Pellerin M, Leclerc Y. Effects of University of Wisconsin solution on endothelium-dependent coronary artery relaxation in the rat. Ann Thorac Surg 1993; 55:50-5; discussion 56. [PMID: 8417711 DOI: 10.1016/0003-4975(93)90472-t] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
University of Wisconsin (UW) solution has been reported to enhance myocardial preservation in heart transplantation. To evaluate the effects of UW solution on coronary artery endothelial function, we designed experiments to compare UW solution with a standard crystalloid hyperkalemic cardioplegic solution (CHCS). Isolated rat hearts were studied in a modified Langendorff apparatus for coronary endothelial function. Groups 1 and 2 were perfused with 4 degrees C CHCS (24 mmol/L of KCl) and UW solution, respectively, for 10 minutes at a pressure of 80 cm H2O, whereas group 3 underwent warm ischemia for 10 minutes. Groups 4 and 5 were perfused with and stored for 4 hours in cold (4 degrees C) CHCS and UW solution, respectively. Group 6 underwent 4 hours of topical cooling (4 degrees C) without any cardioplegic perfusion. All groups had 6 hearts each. Endothelium-dependent relaxation and endothelium-independent relaxation of the coronary arteries were tested by infusing 5-hydroxytryptamine (5HT) (10(-6) mol/L) and sodium nitroprusside (10(-5) mol/L), respectively, before and after perfusion with and storage in one of the two cardioplegic solutions. The coronary vasodilatation induced by 5HT and sodium nitroprusside was not altered in hearts perfused with (group 1) or perfused with and stored in CHCS (group 4). Coronary flow increase after 5HT infusion was significantly decreased in hearts perfused with (group 2) (before, 35% +/- 10%; after, 13% +/- 10%; p < 0.01) or perfused with and stored in UW solution (group 5) (before, 34% +/- 5%; after, -5% +/- 12%), indicating severe endothelial dysfunction.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- R Cartier
- Department of Cardiovascular Surgery, Montreal Heart Institute, Quebec, Canada
| | | | | | | | | | | |
Collapse
|
41
|
Tanguay M, Blaise G, Dumont L, Beique G, Hollmann C. Beneficial effects of volatile anesthetics on decrease in coronary flow and myocardial contractility induced by oxygen-derived free radicals in isolated rabbit hearts. J Cardiovasc Pharmacol 1991; 18:863-70. [PMID: 1725899 DOI: 10.1097/00005344-199112000-00012] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Oxygen-derived free radicals have been implicated in reperfusion injury whereas volatile anesthetics have been shown to enhance myocardial recovery during reperfusion. To explore the mechanism by which these agents improve myocardial recovery, we measured the effect of volatile anesthetics on the free radical-induced reduction in left ventricular pressure (LVP), coronary flow, and endothelium-dependent dilation induced by acetylcholine (Ach). Isolated rabbit hearts were perfused in a Langendorff apparatus. Isovolumetric LVP and coronary flow were measured throughout the study. Oxygen-derived free radicals were produced by the electrolysis (direct current of 0.6 mA) of the perfusate. The following volatile anesthetics were used: halothane 0.5 or 1.0%, isoflurane 0.7 or 1.4%, and enflurane 1.0 or 2.0%. Oxygen free radicals induced a significant decrease in systolic LVP and coronary flow. Pretreatment of the heart with enflurane 1.0 or 2.0%, halothane 1.0%, or isoflurane 0.7% attenuated the effect of the free radicals on both systolic LVP and coronary flow. Free radicals reduced the dilating response induced by 0.1 microM Ach with or without addition of volatile anesthetics. These data suggest that the volatile agents have beneficial effects on the free radical cell damage pathway and that this protection is not related to the preservation of endothelium-dependent dilation.
Collapse
Affiliation(s)
- M Tanguay
- Department of Anesthesia, Hospital Notre-Dame, University of Montreal, Quebec, Canada
| | | | | | | | | |
Collapse
|
42
|
Korzeniewski P, Lang SA, Grant R, Loader C, Vaghadia H, Wong D, Waters T, Merrick P, Ali MJ, Dobkowski W, Cornelius T, Hawkins R, Varkey GP, Claffey L, Plourde G, Trahan M, Morris J, Dean DM, Yamaguchi H, Harukuni I, Naito H, Chan VWS, Mati N, Seyone C, Evans D, Chung F, Joffe D, Plourde G, Villemurc C, Hong M, Milne B, Loomis C, Jhamandas K, Priddy R, Archer D, Tang T, Sabourin M, Samanini N, Cuillerier DJ, Schuben A, Awad IA, Perez-Trepichio AD, Ebrahim ZY, Bloomfield EL, Zexu F, Zhengnua G, Qing Z, Balhua S, Miller DR, Martineau RJ, Wynands JE, Hill JD, Knill RL, Skinner MI, Novick TV, McLean RF, Kolton M, Noble WH, Sullivan PJ, Cheng DCH, Chapman KR, Ong D, Roraanelli J, Smallman B, Nathan HJ, Murphy JT, Hall RI, Moffitt EA, Hudson RJ, Pascoe EA, Anderson BA, Thomson IR, Kassum DA, Shanks A, Rosenbloom M, Sidi A, Gehrig TR, Fool JM, Rush W, Martin AJ, Cooper PD, Maltby JR, Johnson D, Hurst T, Mayers I, Wigglesworth DF, Rose DK, Kay JC, Mazer CD, Yang H, Beattie WS, Doyle DJ, Demajo W, Comfort VK, Code WE, Rooney ME, Clark FJS, Sutton IR, Mutch WAC, Thomson IR, Teskey JM, Thiessen OB, Rosanbloom M, Tang TKK, Robblee JA, Nathan HJ, Wynands JE, Eagle CJ, Belenkle I, Chan KL, Tyberg JV, Stockwell M, Zintel T, Gallagher G, Kavanagh B, Sandier A, Lawson S, Chung F, Ong D, Isabel L, Trépanier CA, Campbell DC, Randall TE, Growe GH, Scarth I, Sawchuk CWT, Ong B, Unruh H, Horan T, Greengrass R, Mark D, Kitts JB, Curran MJ, Lindsay P, Polis T, Coté S, Socci M, Wiesel S, Conway JB, Seyone C, Goldberg J, Chung F, Rose DK, Cohen MM, Rogers KH, Duncan PG, Pope WDB, Tweed WA, Biehl D, Novick TV, Skinner MI, Mathieu A, Villeneuve E, Goldsmith CH, Allen GC, Smith CE, Pinchak AC, Hagen JF, Hudson JC, Gennings C, Tyler BL, Keenan RL, Chung F, Seyone C, Matl N, Ong D, Powell P, Tessler MJ, Kleiman SJ, Wiesel S, Tetzlaff JE, Yoon HJ, Baird B, Walsh M, Hondorp G, Wassef MR, Munshi C, Brooks J, Nimphius N, Tweed WA, Lee TL, Tweed WA, Phua WT, Chong KY, Lim E, Finegan BA, Coulson C, Lopaschuk GD, Clanachan AS, Fournier L, Cloutier R, Major D, Sharpe MD, Wexler HR, Dhamee MS, Rooney R, Ong SK, O’Leary E, McCarroll M, Phelan D, Young T, Coghlan D, O’Leary E, Blunnie WP, Splinter WM, Splinter WM, Ryan T, Maguire M, Bouchier-Hayes D, Cunningham AJ, Kamath MV, Fallen EL, Murkin JM, Shannon NA, Montgomery CJ, Karl HW, Raymond J, Drolet P, Tanguay M, Blaise G, Garceau D, Dumont L, Omri A, Sharkawi M, Billard V, Bourgain JL, Panos A, Mazer CD, Lichtenstein SV, Bevan JC, Popovic V, Baxter MRN, Donati F, Bevan DR, Bachman C, Kopelow M, Donen N, Umôn DT, Kemp S, Hartley E, Sikich N, Roy WL, Lerman J, Cooper RM, Yentis SM, Bissonnette B, Halpern L, Roy L, Burrows FA, Fear DW, Hillier S, Sloan M, Crawford M, Blssonnette B, Sikich N, Friedlander M, Sandier AN, Panos L, Winton T, Benureof J, Karski J, Teasdale S, Cruise C, Skala R, Zulys V, Ong D, Chow F, Packota G, Yip R, Bradley J, Arellano R, Sussman G, Sosis M, Braverman B, Sosis M, Ivankovich AD, Manganas M, Lephay A, Fournier T, Kadri N, Ossart M, Sandier AN, Turner KE, Wick V, Wherrett C, Sullivan PJ, Dyck JB, Varvel J, Shafer SL, Fiset P, Balendran P, Meistelman C, Lira E, Sloan M, Nigrovic V, Banoub M, Splinter WM, Roberts DW, Rhine EJ, MacNeill HB, Bonn GE, Clarke WM, Noel LP, Ryan T, Moriarty J, Bouchier-Hayes D, Cunningham AJ, Sandier AN, Baxter AD, Norman P, Samson B, Hull K, Chung F, Mali N, Evans D, Cruise C, Shumka D, Seyone C, Leung PT, Badner NH, Komar WE, Rajasingham M, Farren B, Vaillancourt G, Cournoyer S, Hollmann C, Breen TW, Janzen JA, Crochetiere CT, McMorland GH, Douglas MJ, Kamani AA, Arora SK, Tunstall M, Ross J, Mayer DC, Weeks SK, Norman P, Daley D, Sandier A, Guay J, Gaudreault P, Boulanger A, Tang A, Lortie L, Dupuis C, Backman SB, Bachoo M, Polosa C, Moudgil GC, Frame B, Blajchman HA, Singal DP, Albert JF, Ratcliff A, Law JC, Varvel J, Hung O, Shafer SL, Fiset P, Balendran P, Burgess PM, Doak GJ, Duke PC, Sloan PA, Mather LE, McLean CF, Rutten AJ, Nation RL, Milne RW, Runciman WB, Somoggi AA, Haack C, Shafer SL, Irish CL, Weisleider L, Mazer CD, Bell RS, Dejonckheere M, Levarlet M, d’Hollander A, Taylor RH, Sikich N, Campbell F, McLeod ME, Swartz J, Spahr-Schopfer I, McIntyre BG, Roy WL, Laycock GJA, Mitchell IM, Morton NS, Logan RW, Campbell F, Yentis SM, Fear D, Halpem L, Sloan M, Badgwell JM, Kleinman S, Yentis SM, Britton JT, Hannallah RS, Schafer PO, Norden JM, Splinter WM, Menard EA, Derdamezi JB, Ghurch JG, Britt BA, Radde IC, Sosis M, Kao YJ, Norton RG, Volgyesi GA, Spahr-Schopfer I, Sosis M, Plum M, Sosis M, Smith CE, Pinchak AC, Hancock DE, Owen P, McMeekin J, Hanson S, Cujec B, Feindel CM, Cruz J, Boylen P, Ong D, Murphy JT, Dupuis JY, Nathan HJ, Cattran C, Wynands JE, Murphy JT, Kinley CE, Sulliyan JA, Landymore RW, Robblee JA, Labow R, Buckley DN, Sharpe MD, Guiraudon G, Klein G, Yee R, Black J, Devitt JH, McLellan BA, Dubbin J, Ehrlich LE, Ralley FE, Robbins GR, Symcs JF, Bourke M, Nathan H, Wynands JE. Abstracts. Can J Anaesth 1991. [DOI: 10.1007/bf03008442] [Citation(s) in RCA: 5] [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: 11/29/2022] Open
|
43
|
Lacombe P, Blaise G, Hollmann C, Tanguay M, Loulmet D. Isoproterenol corrects the effects of bupivacaine on the electrophysiologic properties of the isolated rabbit heart. Anesth Analg 1991; 72:70-4. [PMID: 1984379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The purpose of this study was to test the hypothesis that isoproterenol could reverse bupivacaine toxicity. In eight isolated rabbit hearts an electrophysiologic evaluation was performed then repeated during infusion of bupivacaine (1 microgram/mL) alone and bupivacaine plus isoproterenol (1-2 micrograms/mL). Bupivacaine alone increased electrocardiographic intervals (P wave, QRS complex, PR, AV, and QTc interval) and refractory periods of the myocardium and atrioventricular junction as well as the Wenckebach cycle and pacing thresholds. The addition of isoproterenol corrected partially or completely all bupivacaine-induced abnormalities, and decreased sinus cycle length, suggesting a potential therapeutic value in the treatment of bupivacaine intoxication.
Collapse
Affiliation(s)
- P Lacombe
- Department of Cardiology, Notre-Dame Hospital, University of Montreal, Quebec, Canada
| | | | | | | | | |
Collapse
|
44
|
Lacombe P, Blaise G, Loulmet D, Hollmann C. Electrophysiologic effects of bupivacaine in the isolated rabbit heart. Anesth Analg 1991; 72:62-9. [PMID: 1984378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To assess the direct electrophysiologic effects of bupivacaine, we examined the spontaneous sinus rhythm and induced rapid and premature atrial and ventricular pacing in 11 isolated rabbit hearts perfused in the Langendorff apparatus with varying concentrations (designated by []) of bupivacaine (control, n = 2; 0.3 microgram/mL, n = 3; 1.5 micrograms/mL, n = 3; 3.0 micrograms/mL, n = 3). There was no change in sinus node automaticity or sinus node recovery time at any concentration and no evidence of abnormal automaticity. Depression of conduction was reflected by prolongation of the PR interval at the following concentrations: 1.5 micrograms/mL (65.0 ms before, 96.6 ms after) and 3.0 micrograms/mL (61.6 ms before, 103.3 ms after) and increase in atrial and ventricular pacing thresholds at 3.0 micrograms/mL (atrial: 0.86-8.6 mA, ventricular: 2.0-10.0 mA). No spontaneous tachyarrhythmias occurred; 2:1 spontaneous atrioventricular block (n = 1) and a decrease in maximal paced rate with 1:1 anterograde or retrograde atrioventricular conduction were noted at all concentrations of bupivacaine. Thus bupivacaine did not change automaticity but had a depressant effect on conduction at the atrial, ventricular, and atrioventricular levels, providing a basis for clinically occurring atrioventricular block and reentrant arrhythmias.
Collapse
Affiliation(s)
- P Lacombe
- Department of Cardiology, Notre-Dame Hospital, University of Montreal, Quebec, Canada
| | | | | | | |
Collapse
|
45
|
Tanguay M, Blaise GA, Hollmann C, Amyot Y, Beique G, Meloche R. Halothane and isoflurane prevent free radical induced reduction in the coronary flow and contractility of the isolated rabbit-heart. Can J Anaesth 1990; 37:S147. [PMID: 2361266] [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: 12/31/2022] Open
Affiliation(s)
- M Tanguay
- University of Montreal, Notre Dame Hospital, Department of Anesthesiology
| | | | | | | | | | | |
Collapse
|
46
|
Lacombe P, Blaise G, Plante F, Hollmann C. Treatment with isoproterenol of bupivacaine toxicity. Can J Anaesth 1990; 37:S1. [PMID: 2361238 DOI: 10.1007/bf03006282] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Affiliation(s)
- P Lacombe
- University of Montreal, Notre Dame Hospital, Department of Cardiology, Quebec
| | | | | | | |
Collapse
|
47
|
Blaise GA, Villeneuve E, Buluran J, Hollmann C, Amyot Y, Meloche R. Isoflurane does not inhibit platelet-induced vasoconstriction in the canine coronary arteries. Can J Anaesth 1990; 37:S146. [PMID: 2361265] [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: 12/31/2022] Open
Affiliation(s)
- G A Blaise
- University of Montreal, Notre Dame Hospital, Department of Anesthesiology
| | | | | | | | | | | |
Collapse
|
48
|
Crosby ET, Halpern S, Bill KM, Flynnn RJ, Moore J, Navaneelan C, Cunningham A, Yu PYH, Gamling DR, McMorland GH, Perreault C, Guay J, Gaudreault P, Hollman C, Meloche R, Hackman T, Sheps SB, Murray WB, Heiman PA, Slinger P, Triolet W, Jain U, Rao TLK, Dasari M, Pifarre R, Sullivan H, Calandra D, Friesen RM, Bjornson J, Hatton G, Parlow JL, Casey WF, Broadman LM, Rice LJ, Dailey M, Andrews WR, Stigi S, Jendrek V, Shevde K, Withington DE, Saoud AT, Ramsay JG, Bilodeau J, Johnson D, Mayers I, Doran RJ, Wong PY, Mullen BJ, Wigglesworth D, Byrick RJ, Kay JC, Stubbing JF, Sweeney BP, Dagher E, Dumont L, Lagace G, Chartrand C, Badner NH, Sandier AN, Leitch L, Koren G, Erian RF, Bunegin L, Shulman DL, Burrows F, O’Sullivan K, Bouchier D, Kashin BA, Wynands JE, Villeneuve E, Blaise G, Guerrard MJ, Buluran J, Effa E, Vaghadia H, Jenkins LC, Janisse T, Scudamore CH, Patel PM, Mutch WAC, Ruta TS, McNeill BR, Murkin JM, Gelb AW, Farrar JK, Johnson GD, Adams MA, Lillicrap DP, Lindblad T, Beattie WS, Buckley DN, Forrest JB, Lessard MR, Trépanier CA, Baribault JP, Brochu JG, Brousseau CA, Cote JJ, Denault P, Whang P, Moudgil GC, Daly N, Morrison DH, Ogilvie R, Man J, Ehler T, Leitch LF, Dupuis JY, Martin R, Tessonnier JM, Barry AW, Milne B, Quintin L, Gillon JY, Pujol JF, DeMonte F, Zhang C, Hamilton JT, Zhou Y, Plourde G, Picton TW, Kellett A, Pilato MA, Bissonnette B, Lerman J, Brown KA, Dundee JW, Sosis M, Dillon F, Stetson JB, Voorhees WD, Bourland JD, Geddes LA, Shoenlein WE, O’Leary G, Teasdale S, Knill RL, Rose EA, Berko SL, Smith CE, Sadler JM, Bevan JC, Donati F, Bevan DR, Tellez J, Turner D, Kao YJ, Salidivia V, Roldan L, Orrego H, Carmicheal FJ, Kent AP, Parker CJR, Hunter JM, Finley GA, Goresky GV, Klassen K, McDiarmid C, Shaffer E, Vaughan M, Randolph J, Szalados JE, Lazzell VA, Creighton RE, Poon AO, Mclntyre B, Douglas MJ, Swenerton JE, Farquharson DF, Landry D, Petit F, Riegert D, Koch JP, Maggisano R, Devitt JH, Jense HG, Dubin SA, Silverstein PI, Rodriguez N, Wakefield ML, Williams R, Dubin S, Smith JJ, Hofmann VC, Jarvis AP, Forbes RB, Murray DJ, Dillman JB, Dull DL, Cohen MM, Cameron CB, Johnston RG, Konopad E, Jivraj K, Hunt D, Eastley R, Strunin L, Fairbrass MJ, Laganiere S, McGilvery M, Foster B, Young P, Weisel D, Parra L, Suarez Isla BA, Lopez JR, Hall RI, Hawwa R, Kashtan H, Edelist G, Mallon J, Kapala D, Dhamee MS, Reynolds AC, Olund T, Entress J, Kalbfleisch J, Bell SD, Goldberg ME, Bracey BJ, Goldhill DR, Bennett MH, Emmott RS, Innis RF, Yate PM, Flynn PJ, Gill SS, Saunders PR, Geisecke AH, Feldman JM, Banner MJ, Siriwardhana SA, Kawas A, Lipton JL, Giesecke AH, Doyle DJ, Volgyesi GA, Hillier SC, Gallagher J, Hargaden K, Hamil M, Cunningham AJ, Scott WAC, Sielecka D, Illing LH, Jani K, Scarr M, Maltby JR, Roy J, McNulty SE, Torjman M, Carey C, Bracey B, Markham K, Durcan J, Blackstock D, DaSilva CA, Demars PD, Montgomery CJ, Steward DJ, Sessler DI, Laflamme P, McDevitt S, Kamal GD, Symreng T, Tatman DJ, Durcharme J, Varin F, Besner JG, Dyck JB, Chung F, Arellano R, Lim G, Bailey DG, Bayliff CD, Cunningham DG, Ewen A, Sheppard SD, Mahoney LT, Bacon GS, Rice LR, Newman K, Loe W, Toth M, Pilato M, Classen K, McDiamid C, Burrows FA, Irish CL, Casey W, Hauser GJ, Chan MM, Midgley FM, Holbrook PR, Elliott ME, Man WK, Finegan BA, Clanachan AS, Hudson RJ, Thomson IR, Burgess PM, Rosenbloom M, Fisher JM, O’Connor JP, Ralley FE, Robbins GR, Moote CA, Manninen PH, English M, Farmer C, Scott A, White IWC, Biehl D, Donen N, Mansfield J, Cohen M, Wade JG, Woodward C, Ducharme J, Gerardi A, Mijares A, Code WE, Hertz L, Chung A, Meier HMR, Lautenschlaeger E, Seyone C, Wassef MR, Devitt FH, Cheng DCH, Dyck B, Chan VWS, Ferrante FM, Arthur GR, Rice L, Annallah RH, Etches RC, Loulmet D, Lacombe P, Hollmann C, Tanguay M, Blaise GA, Lenis SG, Fear DW, Lang SA, Ha HC, Germain H, Neion A, Dorian P, Salter D, Pollick C, Cervenko F, Parlow J, Pym J, Nakatsu K, Elliott D, Miller DR, Martineau RJ, Ewing D, Martineau RJ, Knox JWD, Oxorn DC, O’Connor JP, Whalley DG, Rogers KH, Kay JC, Mazer CD, Belo SE, Hew-Wing P, Hew E, Tessonier JM, Thibault G, Testaert E, Chartrand D, Cusson JR, Kuchel O, Larochelle P, Couture J. Abstracts. Can J Anaesth 1989. [DOI: 10.1007/bf03005330] [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] Open
|
49
|
Loulmet D, Hollmann C, Blaise GA. Calcium salts: another con. J Cardiothorac Anesth 1989; 3:253-4. [PMID: 2519955 DOI: 10.1016/s0888-6296(89)94370-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
50
|
|