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      Call for Papers: Green Renal Replacement Therapy: Caring for the Environment

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      About Blood Purification: 3.0 Impact Factor I 5.6 CiteScore I 0.83 Scimago Journal & Country Rank (SJR)

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      In vitro Pharmacological Inhibition of Human Vascular Smooth Muscle Cell Proliferation for the Prevention of Hemodialysis Vascular Access Stenosis

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          Abstract

          Background: Vascular access for chronic hemodialysis often fails as a result of stenosis caused primarily by the proliferation of vascular smooth muscle cells (VSMC). Various drugs have been shown to inhibit the proliferation of VSMC under different conditions. Methods: In this study, we compared the inhibitory effect of ten drugs on the proliferation of human aortic smooth muscle cells (SMC) in culture. Quiescent cells were cultured in the presence of growth factors, fetal bovine serum and incremental concentrations of the test drug. Cell proliferation was assessed by the MTT reduction assay. Results: Aspirin, enalaprilat, heparin, hydroxyurea, indomethacin and tirofiban were ineffective. While dipyridamole, paclitaxel, tranilast and verapamil inhibited cell proliferation, the concentrations required were significantly higher than the clinical plasma levels achieved after systemic administration. Conclusion: Local delivery of these drugs to the target site may therefore be a more effective and appropriate strategy for the prevention of hemodialysis vascular access stenosis.

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          Rapid colorimetric assay for cell growth and survival

          François Denizot, Rita Lang (1986)
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            Biodegradable block copolymers for delivery of proteins and water-insoluble drugs.

            Gaylen M. Zentner, Ramesh Rathi, Chung Shih … (2001)
            Release of several drugs from new ABA-type biodegradable thermal gels, ReGel, including proteins and conventional molecules, are presented. These are biodegradable, biocompatible polymers that demonstrate reverse thermal gelation properties. Organic solvents are not used in the synthesis, purification, or formulation of these polymers. The unique characteristics of ReGel hinge on the following two key properties: (1) ReGel is a water soluble, biodegradable polymer at temperatures below the gel transition temperature; (2) ReGel forms a water-insoluble gel once injected. This is consistent with a hydrophobically bonded gel state where all interactions are physical, with no covalent crosslinking. An increase in viscosity of approximately 4 orders of magnitude accompanies the sol--gel transition. The gel forms a controlled release drug depot with delivery times ranging from 1 to 6 weeks. ReGel's inherent ability to solubilize (400 to >2000-fold) and stabilize poorly soluble and sensitive drugs, including proteins is a substantial benefit. The gel provided excellent control of the release of paclitaxel for approximately 50 days. Direct intratumoral injection of ReGel/paclitaxel (OncoGel) results in a slow clearance of paclitaxel from the injection site with minimal distribution into any organ. Efficacies equivalent to maximum tolerated systemic dosing were observed at OncoGel doses that were 10-fold lower. Data on protein release (pGH, G-CSF, insulin, rHbsAg) and polymer biocompatibility are discussed.
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              Results of Prevention of REStenosis with Tranilast and its Outcomes (PRESTO) trial.

              A Lincoff, Sheldon Goldberg, Robert Chan … (2002)
              Restenosis after percutaneous coronary intervention (PCI) is a major problem affecting 15% to 30% of patients after stent placement. No oral agent has shown a beneficial effect on restenosis or on associated major adverse cardiovascular events. In limited trials, the oral agent tranilast has been shown to decrease the frequency of angiographic restenosis after PCI. In this double-blind, randomized, placebo-controlled trial of tranilast (300 and 450 mg BID for 1 or 3 months), 11 484 patients were enrolled. Enrollment and drug were initiated within 4 hours after successful PCI of at least 1 vessel. The primary end point was the first occurrence of death, myocardial infarction, or ischemia-driven target vessel revascularization within 9 months and was 15.8% in the placebo group and 15.5% to 16.1% in the tranilast groups (P=0.77 to 0.81). Myocardial infarction was the only component of major adverse cardiovascular events to show some evidence of a reduction with tranilast (450 mg BID for 3 months): 1.1% versus 1.8% with placebo (P=0.061 for intent-to-treat population). The primary reason for not completing treatment was > or =1 hepatic laboratory test abnormality (11.4% versus 0.2% with placebo, P<0.01). In the angiographic substudy composed of 2018 patients, minimal lumen diameter (MLD) was measured by quantitative coronary angiography. At follow-up, MLD was 1.76+/-0.77 mm in the placebo group, which was not different from MLD in the tranilast groups (1.72 to 1.78+/-0.76 to 80 mm, P=0.49 to 0.89). In a subset of these patients (n=1107), intravascular ultrasound was performed at follow-up. Plaque volume was not different between the placebo and tranilast groups (39.3 versus 37.5 to 46.1 mm(3), respectively; P=0.16 to 0.72). Tranilast does not improve the quantitative measures of restenosis (angiographic and intravascular ultrasound) or its clinical sequelae.
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                Author and article information

                Journal
                Journal ID (publisher-id): BPU
                Journal ID (nlm-ta): Blood Purif
                Journal ID (doi): 10.1159/issn.0253-5068
                Title: Blood Purification
                Publisher: S. Karger AG
                ISSN (Print): 0253-5068
                ISSN (Electronic): 1421-9735
                Publication date Subscription-year: 2004
                Publication date (Print): May 2004
                Publication date (Electronic): 09 July 2004
                Volume: 22
                Issue: 3
                Pages: 307-312
                Affiliations
                aDivision of Nephrology and Hypertension, University of Utah School of Medicine and bVeterans Affairs Salt Lake City Health Care System, cUtah Artificial Heart Institute and Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, USA
                Article
                Publisher ID: 78785 Other ID: Blood Purif 2004;22:307–312
                DOI: 10.1159/000078785
                PubMed ID: 15256797
                SO-VID: d50a8d92-eb1b-4fcc-a5e2-a0b7a1841234
                Copyright © © 2004 S. Karger AG, Basel
                License:

                Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

                History
                Date received : 16 April 2003
                Date accepted : 12 March 2004
                Page count
                Figures: 3, References: 34, Pages: 6
                Categories
                Subject: Original Paper

                ScienceOpen disciplines: Cardiovascular Medicine,Nephrology
                Keywords: Anti-proliferative drugs,Dipyridamole,Paclitaxel,Hemodialysis,Vascular access,Stenosis,Vascular smooth muscle cells
                Data availability:
                ScienceOpen disciplines: Cardiovascular Medicine, Nephrology
                Keywords: Anti-proliferative drugs, Dipyridamole, Paclitaxel, Hemodialysis, Vascular access, Stenosis, Vascular smooth muscle cells

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