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      Reduction in Chronic Allograft Nephropathy by Inhibition of p38 Mitogen-Activated Protein Kinase

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          Abstract

          Background: Chronic allograft nephropathy (CAN) is the major cause for late graft loss and is therefore a key target for therapy. Methods: The impact of p38 mitogen-activated kinase (MAPK) on CAN was investigated by administering FR167653 (32 mg/kg/day), a specific inhibitor of p38 MAPK, for 4 weeks in addition to conventional cyclosporine therapy (1.5 mg/kg/day for 5 days) in an established experimental rat transplantation model. Results: Transplanted rats develop glomerulosclerosis, arterial obliteration, interstitial fibrosis and tubular atrophy, all of which are characteristic of CAN, resulting in shortened survival on 32 weeks. However, the inhibition of p38 MAPK by daily subcutaneous treatment with FR167653 resulted in reduced CAN with preserved renal function and prolonged survival. The FR167653-treated rats had fewer phosphorylated p38 MAPK-positive cells in treated kidneys. Concomitantly, the expression of monocyte chemoattractant protein-1/CCL2 and transforming growth factor-β<sub>1</sub> was markedly reduced. Conclusion: These results suggest that p38 MAPK phosphorylation is involved in the pathogenesis of CAN and provide evidence that p38 MAPK is a novel, appealing therapeutic target for combating CAN.

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          MAP kinases in the immune response.

          Chen Dong, Roger Davis, Richard A. Flavell (2002)
          MAP kinases are among the most ancient signal transduction pathways and are widely used throughout evolution in many physiological processes. In mammalian species, MAP kinases are involved in all aspects of immune responses, from the initiation phase of innate immunity, to activation of adaptive immunity, and to cell death when immune function is complete. In this review, we summarize recent progress in understanding the function and regulation of MAP kinase pathways in these phases of immune responses.
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            The natural history of chronic allograft nephropathy.

            Brian Nankivell, Richard J Borrows, Caroline L S Fung … (2003)
            With improved immunosuppression and early allograft survival, chronic allograft nephropathy has become the dominant cause of kidney-transplant failure. We evaluated the natural history of chronic allograft nephropathy in a prospective study of 120 recipients with type 1 diabetes, all but 1 of whom had received kidney-pancreas transplants. We obtained 961 kidney-transplant-biopsy specimens taken regularly from the time of transplantation to 10 years thereafter. Two distinctive phases of injury were evident as chronic allograft nephropathy evolved. An initial phase of early tubulointerstitial damage from ischemic injury (P<0.05), prior severe rejection (P<0.01), and subclinical rejection (P<0.01) predicted mild disease by one year, which was present in 94.2 percent of patients. Early subclinical rejection was common (affecting 45.7 percent of biopsy specimens at three months), and the risk was increased by the occurrence of a prior episode of severe rejection and reduced by tacrolimus and mycophenolate therapy (both P<0.05) and gradually abated after one year. Both subclinical rejection and chronic rejection were associated with increased tubulointerstitial damage (P<0.01). Beyond one year, a later phase of chronic allograft nephropathy was characterized by microvascular and glomerular injury. Chronic rejection (defined as persistent subclinical rejection for two years or longer) was uncommon (5.8 percent). Progressive high-grade arteriolar hyalinosis with luminal narrowing, increasing glomerulosclerosis, and additional tubulointerstitial damage was accompanied by the use of calcineurin inhibitors. Nephrotoxicity, implicated in late ongoing injury, was almost universal at 10 years, even in grafts with excellent early histologic findings. By 10 years, severe chronic allograft nephropathy was present in 58.4 percent of patients, with sclerosis in 37.3 percent of glomeruli. Tubulointerstitial and glomerular damage, once established, was irreversible, resulting in declining renal function and graft failure. Chronic allograft nephropathy represents cumulative and incremental damage to nephrons from time-dependent immunologic and nonimmunologic causes. Copyright 2003 Massachusetts Medical Society
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              p38 MAPK signalling cascades in inflammatory disease.

              Ellen Herlaar, Zarin Brown (1999)
              Inflammatory mediators released during acute and chronic diseases activate multiple intracellular signalling cascades including the mitogen-activated protein kinase (MAPK) signal transduction pathway, which plays a significant role in the recruitment of leukocytes to sites of inflammation. Stimulation of leukocytes by pro-inflammatory cytokines is known to result in the activation of the MAPK isoform p38. However, the functional consequences of p38 MAPK activation during leukocyte recruitment, including adhesion, migration and effector functions such as oxidative burst and degranulation, are only just beginning to be elucidated. Specific p38 inhibitors aimed at reducing the production of inflammatory mediators are now being developed, and might in the future provide more effective treatment for inflammatory diseases.
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                Author and article information

                Journal
                Journal ID (publisher-id): AJN
                Journal ID (nlm-ta): Am J Nephrol
                Journal ID (doi): 10.1159/issn.0250-8095
                Title: American Journal of Nephrology
                Publisher: S. Karger AG
                ISSN (Print): 0250-8095
                ISSN (Electronic): 1421-9670
                Publication date Subscription-year: 2006
                Publication date (Print): September 2006
                Publication date (Electronic): 15 September 2006
                Volume: 26
                Issue: 4
                Pages: 319-325
                Affiliations
                aDepartment of Gastroenterology and Nephrology, Graduate School of Medical Science, Kanazawa University, Kanazawa, bDivision of Nephrology, Kanazawa Medical University, Kahoku, cDepartment of Urology, Osaka Medical University, Takatsuki, dDepartment of Advanced Technology for Transplantation, Osaka University Graduate School of Medicine, Osaka, and eDepartment of Molecular Preventive Medicine, School of Medicine, University of Tokyo, Tokyo, Japan
                Article
                Publisher ID: 94365 Other ID: Am J Nephrol 2006;26:319–325
                DOI: 10.1159/000094365
                PubMed ID: 16816533
                SO-VID: 7171700a-26f1-4417-b62e-eb7898f9fa9b
                Copyright © © 2006 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 : 18 April 2006
                Date accepted : 05 June 2006
                Page count
                Figures: 5, References: 20, Pages: 7
                Categories
                Subject: Original Report: Laboratory Investigation

                ScienceOpen disciplines: Cardiovascular Medicine,Nephrology
                Keywords: Chemokine,Chronic allograft nephropathy,p38 mitogen-activated kinase,Kidney transplantation,Monocyte chemoattractant protein-1
                Data availability:
                ScienceOpen disciplines: Cardiovascular Medicine, Nephrology
                Keywords: Chemokine, Chronic allograft nephropathy, p38 mitogen-activated kinase, Kidney transplantation, Monocyte chemoattractant protein-1

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