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Liwono Yana J, Zongo A, Eurich D, Dyck J. 114 - Risque de troubles dépressifs associé à l'utilisation médicale du cannabis : une étude de cohorte longitudinale rétrospective. Rev Epidemiol Sante Publique 2022. [DOI: 10.1016/j.respe.2022.06.151] [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: 11/26/2022] Open
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2
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Madsen K, Dang H, Hotte N, Mocanu V, Ferdaoussi M, Thiesen A, Dyck J. A32 EMPAGLIFOZIN IMPROVES GASTROINTESTINAL INFLAMMATION IN A MOUSE MODEL OF COLITIS. J Can Assoc Gastroenterol 2021. [DOI: 10.1093/jcag/gwab002.031] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Empagliflozin (EMPA) is a highly selective sodium glucose cotransporter-2 (SGLT2) inhibitor and is increasingly being utilized as an antihyperglycemic agent in the management of type 2 diabetes. Interestingly, it has been demonstrated in human trials that EMPA treatment exerts potent cardioprotective effects by reducing cardiac inflammation independently of glycemic control. Further, EMPA has also been shown to suppress LPS-induced renal and systemic inflammation in an animal model. Based on these findings, we hypothesized that EMPA treatment may also be effective in reducing gut inflammation.
Aims
The aim of this study was to examine the effects of treatment with EMPA on gastrointestinal inflammation in an animal model of inflammatory bowel disease and to determine mechanistic insights regarding its direct effects on gut cytokine secretion.
Methods
Adult male and female IL-10-/- mice with established colitis were treated with a daily gavage of EMPA (10mg/kg; n=10) or vehicle (n=10) for 14 days. Disease activity was assessed by measurement of mouse weight, colonic weight and length, histological score, cytokine levels in colonic homogenate and lipocalin-2 levels in stool. To examine for possible direct effects of EMPA, colonic explants from wild-type (n=8) and IL-10-/- (n=8) mice were incubated with increasing doses of EMPA (0.1–5 µM) ± LPS (10µg/ml) for 2 hours and tissue levels of IL-1β and TNFα protein measured by ELISA.
Results
After 14 days EMPA treated IL-10-/- mice had a significant improvement in colonic inflammation as evidenced by decreased colonic weight to length ratio (p=0.019), decreased fecal lipocalin-2 (p=0.03), as well as decreased enterocyte injury (p=0.01), decreased lamina propria neutrophils (p=0.01) and decreased total histological score (p=0.006). EMPA treated mice also maintained their weight over the 14 days while untreated mice continued to lose weight (p=0.04). There were no significant differences in colonic homogenate levels of TNFα, IL-1β, or IL-6 or in blood glucose levels between EMPA-treated mice and controls. In addition, EMPA did not suppress levels of basal or LPS-induced TNFα and IL-1β in colonic explants from either wild-type or IL-10-/- mice suggesting that the beneficial effects in IL-10-/- mice were not due to direct effects of EMPA on colonic TNFα or IL-1β cytokine levels.
Conclusions
EMPA treatment dramatically improved histologic and fecal inflammatory markers and maintained body weight in adult IL-10-/- mice with established colitis. These findings suggest further investigations into the effects of EMPA in treating gut inflammation are warranted.
Funding Agencies
CAG, CIHR
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Affiliation(s)
- K Madsen
- University of Alberta, Edmonton, AB, Canada
| | - H Dang
- University of Alberta, Edmonton, AB, Canada
| | - N Hotte
- University of Alberta, Edmonton, AB, Canada
| | - V Mocanu
- Medicine, University of Alberta, Edmonton, AB, Canada
| | | | - A Thiesen
- University of Alberta, Edmonton, AB, Canada
| | - J Dyck
- University of Alberta, Edmonton, AB, Canada
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Sharma N, Howlett J, Ezekowitz J, Anderson T, Dyck J. FACTORS ASSOCIATED WITH IMPROVEMENT IN LEFT VENTRICULAR EJECTION FRACTION FOLLOWING MEDICAL THERAPY: FINDINGS FROM THE ALBERTA HEART STUDY. Can J Cardiol 2017. [DOI: 10.1016/j.cjca.2017.07.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Ahmadi A, Renaud J, Petryk J, Hadizad T, Ruddy T, Dyck J, Beanlands R, deKemp R, Lopaschuk G, Mielniczuk L. INHIBITION OF FATTY ACID OXIDATION IS ASSOCIATED WITH IMPROVED RIGHT VENTRICULAR FUNCTION AND METABOLISM IN TWO RAT MODELS OF PULMONARY ARTERIAL HYPERTENSION. Can J Cardiol 2017. [DOI: 10.1016/j.cjca.2017.07.326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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5
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Hall A, Kissel C, Fung M, Pajevic M, Ramadan D, Jackson-Carter L, Haykowski M, Howlett J, Dyck J, Anderson T. IMPAIRED MICROVASCULAR FUNCTION IN SUBJECTS WITH HEART FAILURE: RESULTS FROM THE ALBERTA HEART FAILURE ETIOLOGY AND ANALYSIS RESEARCH TEAM (HEART) STUDY. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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6
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Tilley S, Alghamdi F, Anderson T, Chow K, Choy J, Dyck J, Ezekowitz J, Gibson P, Kaul P, Narine K, Pagano J, Paterson I, Savu A, Thompson R, Becher H. DETERMINATION OF NORMAL LV VOLUME AND EF BY CONTRAST ECHO AND COMPARISON WITH CARDIAC MRI. Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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7
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Wong JYW, Buchholz H, Ryerson L, Conradi A, Adatia I, Dyck J, Rebeyka I, Lien D, Mullen J. Successful Semi-Ambulatory Veno-Arterial Extracorporeal Membrane Oxygenation Bridge to Heart-Lung Transplantation in a Very Small Child. Am J Transplant 2015; 15:2256-60. [PMID: 25872800 DOI: 10.1111/ajt.13239] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 01/16/2015] [Accepted: 01/25/2015] [Indexed: 01/25/2023]
Abstract
Lung transplantation (LTx) may be denied for children on extracorporeal membrane oxygenation (ECMO) due to high risk of cerebral hemorrhage. Rarely has successful LTx been reported in children over 10 years of age receiving awake or ambulatory veno-venous ECMO. LTx following support with ambulatory veno-arterial ECMO (VA ECMO) in children has never been reported to our knowledge. We present the case of a 4-year-old, 12-kg child with heritable pulmonary artery hypertension and refractory right ventricular failure. She was successfully bridged to heart-lung transplantation (HLTx) using ambulatory VA ECMO. Initial resuscitation with standard VA ECMO was converted to an ambulatory circuit using Berlin heart cannulae. She was extubated and ambulating around her bed while on VA ECMO for 40 days. She received an HLTx from an oversized marginal lung donor. Despite a cardiac arrest and Grade 3 primary graft dysfunction, she made a full recovery without neurological deficits. She achieved 104% force expiratory volume in 1 s 33 months post-HLTx. Ambulatory VA ECMO may be a useful strategy to bridge very young children to LTx or HLTx. Patient tailored ECMO cannulation, minimization of hemorrhage, and thrombosis risks while on ECMO contributed to a successful HLTx in our patient.
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Affiliation(s)
- J Y W Wong
- Department of Pediatrics, Division of Pediatric Respiratory Medicine, McMaster University, Hamilton, Ontario, Canada
| | - H Buchholz
- Department of Cardiac Surgery, University of Alberta, Edmonton, Alberta, Canada
| | - L Ryerson
- Department of Pediatrics, Pediatric Cardiac Intensive Care Unit, University of Alberta, Edmonton, Alberta, Canada
| | - A Conradi
- Department of Pediatrics, Pediatric Intensive Care Unit, University of Alberta, Edmonton, Alberta, Canada
| | - I Adatia
- Department of Pediatrics, Pediatric Intensive Care Unit, University of Alberta, Edmonton, Alberta, Canada
| | - J Dyck
- Department of Pediatrics, Division of Pediatric Cardiology, University of Alberta, Edmonton, Alberta, Canada
| | - I Rebeyka
- Department of Cardiac Surgery, University of Alberta, Edmonton, Alberta, Canada
| | - D Lien
- Department of Medicine, Division of Respiratory Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - J Mullen
- Department of Cardiac Surgery, University of Alberta, Edmonton, Alberta, Canada
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Yavari M, Buijs D, Haykowsky M, Podder M, Irwin M, Dyck J, Haennel R. Volume and patterns of physical activity in heart failure patients. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.3300] [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: 11/16/2022]
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9
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Griener A, Dyck J, Gosgnach S. Regional distribution of putative rhythm-generating and pattern-forming components of the mammalian locomotor CPG. Neuroscience 2013; 250:644-50. [PMID: 23933310 DOI: 10.1016/j.neuroscience.2013.07.070] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 07/29/2013] [Accepted: 07/30/2013] [Indexed: 11/28/2022]
Abstract
The ventromedial spinal cord of mammals contains a neural network known as the locomotor central pattern generator (CPG) which underlies the basic generation and coordination of muscle activity during walking. To understand how this neural network operates, it is necessary to identify, characterize, and map connectivity among its constituent cells. Recently, a series of studies have analyzed the activity pattern of interneurons that are rhythmically active during locomotion and suggested that they belong to one of two functional levels; one responsible for rhythm generation and the other for pattern formation. Here we use electrophysiological techniques to identify locomotor-related interneurons in the lumbar spinal cord of the neonatal mouse. By analyzing their activity during spontaneous deletions that occur during fictive locomotion we are able to distinguish between those likely to belong to the rhythm-generating and pattern-forming levels, and determine the regional distribution of each. Anatomical tracing techniques are also employed to investigate the morphological characteristics of cells belonging to each level. Results demonstrate that putative rhythm-generating cells are medially located and extend locally projecting axons, while those with activity consistent with pattern formation are located more laterally and send axonal projections to the lateral edge of the spinal cord, in the direction of the motoneuron pools. Results of this study provide insight into the detailed anatomical organization of the locomotor CPG.
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Affiliation(s)
- A Griener
- Center for Neuroscience, Faculty of Medicine, University of Alberta, 3-020D Katz Building, Edmonton, Alberta T6G 2H7, Canada
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10
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Calvo E, Vermorken JB, Hiret S, Rodon J, Cortes J, Senellart H, Van den Brande J, Dyck J, Pétain A, Ferre P, Bennouna J. Phase I dose-escalation study of vinflunine hard capsules administered twice a day for 2 consecutive days every week in patients with advanced/metastatic solid tumors. Cancer Chemother Pharmacol 2012; 69:1467-75. [DOI: 10.1007/s00280-012-1856-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Accepted: 02/17/2012] [Indexed: 11/28/2022]
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11
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Specenier PM, Van den Weyngaert D, Van Laer C, Weyler J, Van den Brande J, Huizing MT, Dyck J, Schrijvers D, Vermorken JB. Phase II feasibility study of concurrent radiotherapy and gemcitabine in chemonaive patients with squamous cell carcinoma of the head and neck: long-term follow up data. Ann Oncol 2007; 18:1856-60. [PMID: 17823386 DOI: 10.1093/annonc/mdm346] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Radiotherapy (RT) with concurrent chemotherapy is the current standard of care for patients with unresectable locally advanced squamous cell carcinoma of the head and neck (SCCHN). Gemcitabine (GEM) is a potent radiosensitizer and in addition has activity as an anticancer agent in SCCHN. PATIENTS AND METHODS Twenty-six patients with locally far advanced SCCHN were enrolled in a chemoradiation feasibility study between November 1998 and September 2003. Use was made of conventionally fractionated RT and GEM 100 mg/m(2), which was given within 2 h prior to radiotherapy on a weekly basis starting on day 1 of RT. Response was assessed according to WHO criteria, toxicity according to NCI-CTC version 2. RESULTS The patients received a median of 7 (2-8) weekly cycles of gemcitabine and a median cumulative RT dose of 70 Gy (66-84.75). Hematologic toxicity was mild, but non-hematologic toxicity was severe: grade 3-4 stomatitis occurred in 85% of patients, dermatitis in 69%, pharyngitis/esophagitis in 81% and 80% of the patients needed a feeding tube during treatment. All 22 evaluable patients responded (50% complete, 50% partial). Median follow up of the surviving patients is 46 months. Median disease-free and overall survival is 13 months and 19 months, respectively; 27% of the patients are alive without evidence of recurrence beyond 3 years. CONCLUSIONS Conventionally fractionated RT in combination with GEM 100 mg/m(2) weekly is feasible and highly active in the treatment of locally advanced SCCHN. In particular, long-term local control rate is promising. Acute mucosal toxicities are significant but manageable. Long-term toxicity interferes with normal food intake.
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Affiliation(s)
- P M Specenier
- Department of Medical Oncology, University Hospital Antwerp, Edegem, Belgium
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12
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Rasschaert M, Schrijvers D, Van den Brande J, Dyck J, Bosmans J, Merkle K, Vermorken JB. A phase I study of bendamustine hydrochloride administered day 1+2 every 3 weeks in patients with solid tumours. Br J Cancer 2007; 96:1692-8. [PMID: 17486132 PMCID: PMC2359912 DOI: 10.1038/sj.bjc.6603776] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The aim of the study was to determine the maximum tolerated dose (MTD), the dose limiting toxicity (DLT), and the pharmacokinetic profile (Pk) of bendamustine (BM) on a day 1 and 2 every 3 weeks schedule and to recommend a safe phase II dose for further testing. Patients with solid tumours beyond standard therapy were eligible. A 30-min intravenous infusion of BM was administered d1+d2 q 3 weeks. The starting dose was 120 mg m(-2) per day and dose increments of 20 mg m(-2) were used. Plasma and urine samples were analysed using validated high-performance liquid chromatography/fluorescence assays. Fifteen patients were enrolled. They received a median of two cycles (range 1-8). The MTD was reached at the fourth dose level. Thrombocytopaenia (grade 4) was dose limiting in two of three patients at 180 mg m(-2). One patient also experienced febrile neutropaenia. Lymphocytopaenia (grade 4) was present in every patient. Nonhaematologic toxicity including cardiac toxicity was not dose limiting with this schedule. Mean plasma Pk values of BM were tmax 35 min, t(1/2) 49.1 min, Vd 18.3 l m(-2), and clearance 265 ml min(-1) m(-2). The mean total amount of BM and its metabolites recovered in the first micturition was 8.3% (range 2.7-26%). The MTD of BM in the present dose schedule was 180 mg m(-2) on day 1+2. Thrombocytopaenia was dose limiting. The recommended dose for future phase II trials with this schedule is 160 mg m(-2) per day.
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Affiliation(s)
- M Rasschaert
- Department of Medical Oncology, University Hospital Antwerp, Wilrijkstraat 10, 2650 Edegem, Belgium
| | - D Schrijvers
- Department of Medical Oncology, ziekenhuis netwerk Antwerpen - Middelheim, Lindendreef 1B, 2020 Antwerpen, Belgium
| | - J Van den Brande
- Department of Medical Oncology, University Hospital Antwerp, Wilrijkstraat 10, 2650 Edegem, Belgium
| | - J Dyck
- Department of Medical Oncology, University Hospital Antwerp, Wilrijkstraat 10, 2650 Edegem, Belgium
| | - J Bosmans
- Department of Cardiology, University Hospital Antwerp, Wilrijkstraat 10, 2650 Edegem, Belgium
| | - K Merkle
- Clinical Research, Ribosepharm GmbH, Munich, Germany
| | - J B Vermorken
- Department of Medical Oncology, University Hospital Antwerp, Wilrijkstraat 10, 2650 Edegem, Belgium
- E-mail:
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13
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Kamke W, Micklich G, Kuhnt K, Dyck J. Ergebnisse einer 12-tägigen „Komplexschulung“ bei Diabetes Typ 2. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Van Den Brande J, Rasschaert M, Van den Weyngaert D, Van Laer C, Dyck J, Wilmes P, Pauwels B, Vermorken J. 141 A phase II feasibility study of concurrent radiotherapy and gemcitabine for patients with cancer of the head and neck. EJC Suppl 2003. [DOI: 10.1016/s1359-6349(03)90174-1] [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: 11/27/2022] Open
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16
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Schrijvers D, Bos AME, Dyck J, de Vries EGE, Wanders J, Roelvink M, Fumoleau P, Bortini S, Vermorken JB. Phase I study of MEN-10755, a new anthracycline in patients with solid tumours: a report from the European Organization for Research and Treatment of Cancer, Early Clinical Studies Group. Ann Oncol 2002; 13:385-91. [PMID: 11996468 DOI: 10.1093/annonc/mdf061] [Citation(s) in RCA: 17] [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: 11/14/2022] Open
Abstract
A phase I study was performed with MEN-10755, a novel anthracycline with promising preclinical antitumour activity, in patients with solid tumours to determine the maximum tolerated dose (MTD); the dose-limiting toxicities (DLTs); to document antitumour activity; and to propose a safe dose for phase II evaluation. MEN-10755 at a starting dose of 15 mg/m2/week was given by short intravenous infusion weekly for 3 weeks and cycles were repeated every 28 days. Twenty-four patients received 55 cycles. Doses of MEN-10755 were 15, 30, 40 and 45 mg/m2. At a dose of MEN-10755 45 mg/m2, treatment could not be given as planned due to neutropenia and one patient developed a decrease in cardiac function. This dose level was considered to be the MTD. Chemotherapy-naive patients could be treated with 40 mg/m2/week, and only one DLT (grade 4 neutropenia) was observed. At that dose, three of six chemotherapy pretreated patients developed a DLT during their first treatment cycle: one patient developed a grade 4 thrombocytopenia, one patient a grade 4 neutropenia and one patient developed a grade 3 acute hypersensitivity reaction resulting in discontinuation of treatment. At this dose level, one other patient did not receive treatment on day 15 as planned due to grade 3 neutropenia. No responses were observed. MEN-107555 at a dose of 30 mg/m2/week in pretreated patients and 40 mg/m2/week in chemotherapy-naive patients for three consecutive weeks followed by 1 week rest is recommended for phase II testing.
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Affiliation(s)
- D Schrijvers
- Department of Medical Oncology, University Hospital Antwerp, Edegem, Belgium
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17
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Wang S, Michelakis E, Dyck J, Nsair A, Wu XC, Moudgil R, Hashimoto K, Archer S. Gene transfer in human pulmonary arteries using adenoviral vectors: increasing expression and activity of potassium channels. J Heart Lung Transplant 2002. [DOI: 10.1016/s1053-2498(01)00463-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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18
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Dyck J, Loo S, Zacher N, Wong D, McDonald PC, Walker DC, Wilson JE, McManus BM. Use of en face silver nitrate staining to assess endothelial gaps and vascular permeability in rat coronary artery transplant vasculopathy. J Heart Lung Transplant 2001; 20:229-230. [PMID: 11250437 DOI: 10.1016/s1053-2498(00)00511-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- J Dyck
- The University of British Columbia - St. Paul's Hospital, Vancouver, Canada
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Abstract
In mink production, silkiness refers to a silky fur surface. The sensory evaluation of silkiness may be based on information perceived by the eyes and the hands. Silkiness is assumed to depend on hair fiber properties such as guard hair straightness, glossiness, and smoothness. Our objective was to characterize the dorsal surface of brown mink pelts by means of optical variables and relate these to the visual grades of silkiness, thereby forming some objective criteria of silkiness. Two groups of brown male mink pelts (winter coat) that originated from a selection trial with a focus on silkiness were used. The pelts came from a basic (Group 1992) population and a selected (Group 1994) generation. Group 1992 was graded visually on a scale from 1 to 6 (most silky); Group 1994 was graded on a scale from 1 to 8 (most silky). With goniophotometric, nondestructive methods, the reflectance from each pelt surface was measured describing the angle-dependent distribution of reflection in the shape of angular reflectance curves. The measurements were performed along (w-reflectance curve) and across (c-reflectance curve) the guard hairs. The w-curve included a maximum assumed to be related to silkiness. Specular gloss, indicated by the maximum reflectance (s) in the direction of mirror reflection, was positively correlated with silkiness. For Group 1994, s = 72.94 + .49 x silkiness; r2 = .33, P = .0003. Correspondingly, an area representing specular (S) plus diffuse (D) reflectance (S + D) under the curve was positively correlated with silkiness. A decreasing band width of the w-curve at 90% of maximum specular reflectance (w90) was related to an increase of silkiness (Group 1992: r = -.50, P < .01). Furthermore, both s/w90 and (S + D)/w90 were positively correlated with silkiness (Group 1992: r = .49, P < .01 and r = .51, P < .01, respectively). Measures of contrast gloss involving relations or differences between specular and diffuse reflectance were not suitable. From our results, a high degree of specular gloss, indicated by s, explained and was related to an essential part of silkiness and general sensory quality of the pelts investigated. Also, s was relatively easy to measure. Thus, even if the objective variables did not correlate perfectly with visual judgments, s was considered to be the most usable objective variable in characterizing silkiness.
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Affiliation(s)
- P V Rasmussen
- Department of Animal Product Quality, Danish Institute of Agricultural Sciences, Research Centre Foulum, Tjele
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20
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Mitchelhill KI, Michell BJ, House CM, Stapleton D, Dyck J, Gamble J, Ullrich C, Witters LA, Kemp BE. Posttranslational modifications of the 5'-AMP-activated protein kinase beta1 subunit. J Biol Chem 1997; 272:24475-9. [PMID: 9305909 DOI: 10.1074/jbc.272.39.24475] [Citation(s) in RCA: 119] [Impact Index Per Article: 4.4] [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: 02/05/2023] Open
Abstract
The AMP-activated protein kinase (AMPK) consists of catalytic alpha and noncatalytic beta and gamma subunits and is responsible for acting as a metabolic sensor for AMP levels. There are multiple genes for each subunit and the rat liver AMPK alpha1 and alpha2 catalytic subunits are associated with beta1 and gamma1 noncatalytic subunits. We find that the isolated gamma1 subunit is N-terminally acetylated with no other posttranslational modification. The isolated beta1 subunit is N-terminally myristoylated. Transfection of COS cells with AMPK subunit cDNAs containing a nonmyristoylatable beta1 reduces, but does not eliminate, membrane binding of AMPK heterotrimer. The isolated beta1 subunit is partially phosphorylated at three sites, Ser24/25, Ser182, and Ser108. The Ser24/25 and Ser108 sites are substoichiometrically phosphorylated and can be autophosphorylated in vitro. The Ser-Pro site in the sequence LSSS182PPGP is stoichiometrically phosphorylated, and no additional phosphate is incorporated into this site with autophosphorylation. Based on labeling studies in transfected cells, we conclude that alpha1 Thr172 is a major, although not exclusive, site of both basal and stimulated alpha1 phosphorylation by an upstream AMPK kinase.
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Affiliation(s)
- K I Mitchelhill
- St. Vincent's Institute of Medical Research, 41 Victoria Parade, Fitzroy, Victoria 3065 Australia
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21
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Rutledge J, Robertson MA, Kantoch M, Dyck J. Idiopathic dilation of the right atrium: case report and survey of the literature. Can J Cardiol 1997; 13:855-7. [PMID: 9343037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Idiopathic dilation of the right atrium (IDRA) is a rare cardiac anomaly of unknown etiology. Whether it is an acquired or congenital lesion is controversial. A case of IDRA detected in utero and confirmed postnatally is reported. The postnatal course was complicated by the development of atrial flutter successfully treated with sotalol. A review of the literature concerning IDRA is presented.
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Affiliation(s)
- J Rutledge
- Department of Pediatrics, University of Alberta, Edmonton
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22
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Abstract
A new method of creating atrial septal defect, using a 3- or 4-blade cutting balloon catheter combined with conventional static balloon dilation, is discussed. Radially directed surgical cuts made in the atrial septum were enlarged by balloon angioplasty, producing defects measuring 3 to 8 mm, with a mean Qp/Qs of 1.96/L.
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Affiliation(s)
- J Y Coe
- Division of Pediatric Cardiology, University of Alberta, Edmonton, Canada
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23
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Abstract
An unconventional transaortic to transductal approach was performed to perforate and dilate the pulmonary valve in pulmonary atresia. Ductal arteriosus patency was maintained by prostaglandin.
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Affiliation(s)
- J Y Coe
- Children's Health Center, University of Alberta, Edmonton, Canada
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Abstract
Despite a wealth of data documenting acute cardiac injury from anthracycline therapy and/or mediastinal radiotherapy used for childhood cancer, little information is available on the long-term consequence of these insults. Twenty-nine patients (mean age 15 +/- 4.3 years) from The Late Effects Follow-Up Clinic For Childhood Cancer study, who had been in continuous, complete remission and off chemotherapy for a minimum of 2 years (mean follow-up 7.2 +/- 3.2) were studied. All patients had normal ejection fractions before and during cancer therapy and all were in New York Heart Association class I at the time of study. Systolic and diastolic functions were assessed by 2-dimensional echocardiography, Doppler flow velocity, and radionuclide angiography, and results were compared with normal control subjects. Left ventricular mass and mass index were significantly reduced in the patient population. Fractional shortening was decreased overall and end-systolic wall stress was much higher in patients than in controls. However, contractility, as assessed by the relation of wall stress to rate-corrected velocity of shortening, was decreased by > or = 2 SDs in only 6 of 28 patients, and the force-mass relation was actually increased in the patient group as a whole. Mitral valve inflow velocities were significantly increased but the pattern was abnormal. These results suggest a pattern consistent with a thin-walled, complaint left ventricle with reduced muscle mass performing under above-normal levels of wall stress. Contractility measurements were normal or increased in the group, but some patients clearly demonstrated development of reduced contractile function.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J Leandro
- Division of Cardiology, Hospital for Sick Children, University of Toronto, Ontario, Canada
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26
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Coleman DM, Cox PN, Dyck J, Razzouk AJ, Rebeyka IM. Pediatric transesophageal echocardiography in the evaluation of acute disruption of the mitral valve following blunt thoracic trauma: case report. J Trauma 1994; 36:135-6. [PMID: 8295242 DOI: 10.1097/00005373-199401000-00026] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Disruption of the mitral valve following blunt thoracic trauma has been only occasionally reported. A case of a pediatric patient with this complication is presented and the value of transesophageal echocardiography in diagnosis and management is documented.
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Affiliation(s)
- D M Coleman
- Department of Cardiology, Hospital for Sick Children, Toronto, Ontario, Canada
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27
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Abstract
Balloon atrial septostomy is an established method of palliation for several forms of congenital heart disease. Previously performed under fluoroscopic x-ray control, recent reports have demonstrated the utility of transthoracic echocardiographic monitoring. We report the first application of uniplane transesophageal echocardiography (TEE) (6.7-mm probe) as an alternative imaging modality for control of balloon atrial septostomy on neonates in the intensive care unit.
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Affiliation(s)
- C Boutin
- Department of Paediatrics, Hospital for Sick Children, University of Toronto School of Medicine, Ontario, Canada
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28
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Cohen AJ, Cleveland DC, Dyck J, Poppe D, Smallhorn J, Freedom RM, Trusler GA, Coles JG, Moes CA, Rebeyka IM. Results of the Fontan procedure for patients with univentricular heart. Ann Thorac Surg 1991; 52:1266-70; discussion 1270-1. [PMID: 1836719 DOI: 10.1016/0003-4975(91)90011-e] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
One hundred twenty-four consecutive patients with univentricular heart undergoing the Fontan operation were reviewed. Patients with tricuspid atresia or biventricular heart with hypoplasia of one ventricle were excluded. Eighty-four patients had left ventricular morphology. Atrioventricular connection was double-inlet (n = 76), common (n = 29), absent left atrioventricular connection (n = 14), and absent right atrioventricular connection (n = 5). Actuarial survival was 77% (70% confidence limits, 73% to 81%) at 1 year, 66% (70% confidence limits, 60% to 72%) at 5 years, and 49% (70% confidence limits, 36% to 61%) at 10 years, indicating a continuing risk for premature death. Multivariate analysis identified preoperative ventricular function and hypertrophy as risk factors for survival. High postrepair right atrial pressure (greater than 15 mm Hg) emerged as a strong intraoperative predictor of survival. Logistic regression analysis of these factors predicts high probability of death for certain subgroups of patients after the Fontan operation. Forty-four percent (n = 53) of these original 124 patients are alive and in New York Heart Association class I at follow-up. Thirty-eight percent (n = 33) of survivors have worse ventricular function than preoperative. Long-term survival is disappointing. Certain identifiable subgroups of patients with univentricular heart have unacceptable risks for the Fontan operation and should have alternate management. High postrepair right atrial pressure is an ominous sign, and if it persists the Fontan should be fenestrated or taken down.
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Affiliation(s)
- A J Cohen
- Department of Cardiovascular Surgery, Hospital for Sick Children, Toronto, Canada
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29
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Abstract
Percutaneous transcatheter closure of the patent ductus arteriosus has become a clinically viable procedure in childhood due to the pioneering work of Rashkind and Mullins. Presented is a modification of the technique to accomplish catheter closure in the small ductus arteriosus.
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Affiliation(s)
- L N Benson
- Hospital for Sick Children, Toronto, Ontario, Canada
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30
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Bosco J, Dyck J. Molecular biology in clinical haematology. Malays J Pathol 1986; 8:9-16. [PMID: 2890798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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31
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Dyck J, Wurth B. ["Always daughter of the air." The dangerous life of Effie Briest]. Psyche (Stuttg) 1985; 39:617-33. [PMID: 4023268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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32
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Wilson FD, Greenberg B, Spangler W, Shifrine M, Gershwin ME, Dyck J. Production of mesenchymal tumors in nude mice by Ph1 negative fibroblasts obtained from a Ph 1 positive CML patient: a preliminary report. Exp Hematol 1978; 6:549-57. [PMID: 276472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An experimental model system is presented for the investigation in humans of the role of hematopoietic stromal elements in the regulation of hematopoiesis as well as in the pathogenesis of myelofibrosis in myeloproliferative disorders. The model is based on the simultaneous application of three experimental techniques: (1) growth of bone-marrow derived fibroblastic colonies in vitro, (2) cytogenetic demonstration of marker chromosomes associated with hematopoietic malignancies, and (3) the transplantation of isolated stromal elements into athymic (nude) mice. Using this model, we describe the induction of mesenchymal tumors in nude mice by Ph1 negative fibroblasts obtained from the bone marrow of a patient with a Ph1 positive chronic myelogenous leukemia. Mesenchymal tumors also were induced in nude mice with bone marrow-derived fibroblasts from a patient with aplastic anemia, who was successfully treated with bone marrow transplantation, and from a normal human volunteer. Morphologic, cytogenetic and electron microscopic studies of bone marrow mesenchymal elements in culture and of tumors induced in nude mice from the CML patient indicate the cells composing the tumor are of human origin and are negative for the Ph1 chromosome. The results provide the first in vivo morphological and cytogenetic support using human materials, of the hypothesized relationship of progenitors of in vitro fibroblastic colonies to marrow stromal elements.
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MESH Headings
- Animals
- Bone Marrow/pathology
- Cells, Cultured
- Chromosomes, Human, 21-22 and Y
- Female
- Fibroblasts/pathology
- Fibroblasts/transplantation
- Hematopoiesis
- Humans
- Leukemia, Myeloid/genetics
- Leukemia, Myeloid/pathology
- Mice
- Mice, Nude
- Middle Aged
- Models, Biological
- Neoplasms, Experimental/etiology
- Neoplasms, Experimental/pathology
- Transplantation, Heterologous
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33
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Wilson FD, Shifrine M, Gershwin ME, Spangler W, Dyck J. Growth of canine T-lymphocyte colonies in vitro. Exp Hematol 1978; 6:539-48. [PMID: 307494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Canine lymphocytes from peripheral blood, lymph nodes, thymus and bone marrow were stimulated with phytohemagglutinin-P (PHA) or concanavalin-A (CON-A) to form colonies in methylcellulose. Lymphocytes exposed to mitogens in liquid phase formed clumps the size of colonies. Lymphocyte clumping was eliminated by plating cells directly into methylcellulose, but high concentrations of mitogens (CON-A or PHA is greater than 10 mg/10(6) lymphocytes) were required in order to get subsequent colony formation. Thus, in contrast to published reports, exposure of lymphocytes to mitogen prior to plating was not required for cloning of canine peripheral blood lymphocytes. Colonies from thymus, lymph node, or peripheral blood consisted predominantly of T lymphocytes, whereas cultures from bone marrow also produced colonies with macrophage morphology and surface-adherent colonies with mesenchymal morphology.
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34
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Dyck J. Structure and colour-production of the blue barbs of Agapornis roseicollis and Cotinga maynana. Z Zellforsch Mikrosk Anat 1971; 115:17-29. [PMID: 5573143 DOI: 10.1007/bf00330211] [Citation(s) in RCA: 48] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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