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      Towards Retinoid Therapy for Alzheimer’s Disease

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          Abstract

          Alzheimer’s disease(AD) is associated with a variety of pathophysiological features, including amyloid plaques, inflammation, immunological changes, cell death and regeneration processes, altered neurotransmission, and age-related changes. Retinoic acid receptors (RARs) and retinoids are relevant to all of these. Here we review the pathology, pharmacology, and biochemistry of AD in relation to RARs and retinoids, and we suggest that retinoids are candidate drugs for treatment of AD.

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          Most cited references139

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          Inflammation and Alzheimer's disease.

          Inflammation clearly occurs in pathologically vulnerable regions of the Alzheimer's disease (AD) brain, and it does so with the full complexity of local peripheral inflammatory responses. In the periphery, degenerating tissue and the deposition of highly insoluble abnormal materials are classical stimulants of inflammation. Likewise, in the AD brain damaged neurons and neurites and highly insoluble amyloid beta peptide deposits and neurofibrillary tangles provide obvious stimuli for inflammation. Because these stimuli are discrete, microlocalized, and present from early preclinical to terminal stages of AD, local upregulation of complement, cytokines, acute phase reactants, and other inflammatory mediators is also discrete, microlocalized, and chronic. Cumulated over many years, direct and bystander damage from AD inflammatory mechanisms is likely to significantly exacerbate the very pathogenic processes that gave rise to it. Thus, animal models and clinical studies, although still in their infancy, strongly suggest that AD inflammation significantly contributes to AD pathogenesis. By better understanding AD inflammatory and immunoregulatory processes, it should be possible to develop anti-inflammatory approaches that may not cure AD but will likely help slow the progression or delay the onset of this devastating disorder.
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            The biological functions of T helper 17 cell effector cytokines in inflammation.

            T helper 17 (Th17) cells belong to a recently identified T helper subset, in addition to the traditional Th1 and Th2 subsets. These cells are characterized as preferential producers of interleukin-17A (IL-17A), IL-17F, IL-21, and IL-22. Th17 cells and their effector cytokines mediate host defensive mechanisms to various infections, especially extracellular bacteria infections, and are involved in the pathogenesis of many autoimmune diseases. The receptors for IL-17 and IL-22 are broadly expressed on various epithelial tissues. The effector cytokines of Th17 cells, therefore, mediate the crucial crosstalk between immune system and tissues, and play indispensable roles in tissue immunity.
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              Systemic infections and inflammation affect chronic neurodegeneration.

              It is well known that systemic infections cause flare-ups of disease in individuals with asthma and rheumatoid arthritis, and that relapses in multiple sclerosis can often be associated with upper respiratory-tract infections. Here we review evidence to support our hypothesis that in chronic neurodegenerative diseases such as Alzheimer's disease, with an ongoing innate immune response in the brain, systemic infections and inflammation can cause acute exacerbations of symptoms and drive the progression of neurodegeneration.
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                Author and article information

                Journal
                Curr Alzheimer Res
                CAR
                Current Alzheimer Research
                Bentham Science Publishers Ltd.
                1567-2050
                1875-5828
                June 2009
                : 6
                : 3
                : 302-311
                Affiliations
                [1 ]Research Foundation ITSUU Laboratory, Molecular and Functional Bioscience, Japan
                [2 ]Institute of Medicinal Molecular Design, Inc., Molecular and Functional Bioscience, Japan
                Author notes
                [* ]Address correspondence to this author at the Research Foundation ITSUU Laboratory, 2-28-10 tamagawa, setagaya-ku, Tokyo 158-0094, Japan; E-mail: kshudo@ 123456itsuu.or.jp
                Article
                CAR-6-302
                10.2174/156720509788486581
                2765081
                19519313
                db741425-a80b-4ee9-bc92-696c5bf16e84
                ©2009 Bentham Science Publishers Ltd.

                This is an open access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.5/) which permits unrestrictive use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 28 July 2008
                : 5 November 2008
                : 12 November 2008
                Categories
                Article

                Neurology
                alzheimer’s disease,retinoic acid receptors,immunology,retinoid,inflammation,regulatory t cell,neurodegeneration.

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