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Inflammation and the Degenerative Diseases of Aging

Identifieur interne : 002118 ( Main/Corpus ); précédent : 002117; suivant : 002119

Inflammation and the Degenerative Diseases of Aging

Auteurs : Patrick L. Mcgeer ; Edith G. Mcgeer

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RBID : ISTEX:206EE1776C1F24C6DA9DFA709C3D363A5967BA6C

English descriptors

Abstract

Abstract: Chronic inflammation is associated with a broad spectrum of neurodegenerative diseases of aging. Included are such disorders as Alzheimer's disease (AD), Parkinson's disease (PD), amyotrophic lateral sclerosis, the Parkinson‐dementia complex of Guam, all of the tauopathies, and age‐related macular degeneration. Also included are such peripheral conditions as osteoarthritis, rheumatoid arthritis, atherosclerosis, and myocardial infarction. Inflammation is a two‐edged sword. In acute situations, or at low levels, it deals with the abnormality and promotes healing. When chronically sustained at high levels, it can seriously damage viable host tissue. We describe this latter phenomenon as autotoxicity to distinguish it from autoimmunity. The latter involves a lymphocyte‐directed attack against self proteins. Autotoxicity, on the other hand, is determined by the concentration and degree of activation of tissue‐based monocytic phagocytes. Microglial cells are the brain representatives of the monocyte phagocytic system. Biochemically, the intensity of their activation is related to a spectrum of inflammatory mediators generated by a variety of local cells. The known spectrum includes, but is not limited to, prostaglandins, pentraxins, complement components, anaphylotoxins, cytokines, chemokines, proteases, protease inhibitors, adhesion molecules, and free radicals. This spectrum offers a huge variety of targets for new anti‐inflammatory agents. It has been suggested, largely on the basis of transgenic mouse models, that stimulating inflammation rather than inhibiting it can be beneficial in such diseases as AD. If this were the case, administration of NSAIDs, or other anti‐inflammatory drugs, would be expected to exacerbate conditions such as AD, PD, and atherosclerosis. However, epidemiological evidence overwhelmingly demonstrates that the reverse is true. This indicates that, at least in these diseases, the inflammation is harmful. So far, advantage has not been taken of opportunities indicated by these epidemiological studies to treat AD and PD with appropriate anti‐inflammatory agents. Based on this evidence, classical NSAIDs are the most logical choice. Dosage, though, must be sufficient to combat the inflammation. Analysis of mRNA levels of inflammatory mediators indicates that the intensity of inflammation is considerably higher in AD hippocampus and in PD substantia nigra than in osteoarthritic joints. Thus, full therapeutic doses of NSAIDs, or combinations of anti‐inflammatory agents, are needed to achieve the suggested neurological benefits.

Url:
DOI: 10.1196/annals.1332.007

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ISTEX:206EE1776C1F24C6DA9DFA709C3D363A5967BA6C

Le document en format XML

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Chronic inflammation is associated with a broad spectrum of neurodegenerative diseases of aging. Included are such disorders as Alzheimer's disease (AD), Parkinson's disease (PD), amyotrophic lateral sclerosis, the Parkinson‐dementia complex of Guam, all of the tauopathies, and age‐related macular degeneration. Also included are such peripheral conditions as osteoarthritis, rheumatoid arthritis, atherosclerosis, and myocardial infarction. Inflammation is a two‐edged sword. In acute situations, or at low levels, it deals with the abnormality and promotes healing. When chronically sustained at high levels, it can seriously damage viable host tissue. We describe this latter phenomenon as autotoxicity to distinguish it from autoimmunity. The latter involves a lymphocyte‐directed attack against self proteins. Autotoxicity, on the other hand, is determined by the concentration and degree of activation of tissue‐based monocytic phagocytes. Microglial cells are the brain representatives of the monocyte phagocytic system. Biochemically, the intensity of their activation is related to a spectrum of inflammatory mediators generated by a variety of local cells. The known spectrum includes, but is not limited to, prostaglandins, pentraxins, complement components, anaphylotoxins, cytokines, chemokines, proteases, protease inhibitors, adhesion molecules, and free radicals. This spectrum offers a huge variety of targets for new anti‐inflammatory agents. It has been suggested, largely on the basis of transgenic mouse models, that stimulating inflammation rather than inhibiting it can be beneficial in such diseases as AD. If this were the case, administration of NSAIDs, or other anti‐inflammatory drugs, would be expected to exacerbate conditions such as AD, PD, and atherosclerosis. However, epidemiological evidence overwhelmingly demonstrates that the reverse is true. This indicates that, at least in these diseases, the inflammation is harmful. So far, advantage has not been taken of opportunities indicated by these epidemiological studies to treat AD and PD with appropriate anti‐inflammatory agents. Based on this evidence, classical NSAIDs are the most logical choice. Dosage, though, must be sufficient to combat the inflammation. Analysis of mRNA levels of inflammatory mediators indicates that the intensity of inflammation is considerably higher in AD hippocampus and in PD substantia nigra than in osteoarthritic joints. Thus, full therapeutic doses of NSAIDs, or combinations of anti‐inflammatory agents, are needed to achieve the suggested neurological benefits.</p>
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<title>Inflammation and the Degenerative Diseases of Aging</title>
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<name type="personal">
<namePart type="given">PATRICK L.</namePart>
<namePart type="family">McGEER</namePart>
<affiliation>Kinsmen Laboratory of Neurological Research, University of British Columbia, Vancouver, British Columbia, Canada</affiliation>
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<namePart type="given">EDITH G.</namePart>
<namePart type="family">McGEER</namePart>
<affiliation>Kinsmen Laboratory of Neurological Research, University of British Columbia, Vancouver, British Columbia, Canada</affiliation>
<description>Correspondence: Address for correspondence: Dr. Patrick L. McGeer, Kinsmen Laboratory of Neurological Research, University of British Columbia, 2255 Wesbrook Mall, Vancouver, British Columbia V6T 1Z3, Canada. Voice: 604‐822‐7380; fax: 604‐822‐7086. </description>
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<dateIssued encoding="w3cdtf">2004-12</dateIssued>
<copyrightDate encoding="w3cdtf">2004</copyrightDate>
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<abstract lang="en">Abstract: Chronic inflammation is associated with a broad spectrum of neurodegenerative diseases of aging. Included are such disorders as Alzheimer's disease (AD), Parkinson's disease (PD), amyotrophic lateral sclerosis, the Parkinson‐dementia complex of Guam, all of the tauopathies, and age‐related macular degeneration. Also included are such peripheral conditions as osteoarthritis, rheumatoid arthritis, atherosclerosis, and myocardial infarction. Inflammation is a two‐edged sword. In acute situations, or at low levels, it deals with the abnormality and promotes healing. When chronically sustained at high levels, it can seriously damage viable host tissue. We describe this latter phenomenon as autotoxicity to distinguish it from autoimmunity. The latter involves a lymphocyte‐directed attack against self proteins. Autotoxicity, on the other hand, is determined by the concentration and degree of activation of tissue‐based monocytic phagocytes. Microglial cells are the brain representatives of the monocyte phagocytic system. Biochemically, the intensity of their activation is related to a spectrum of inflammatory mediators generated by a variety of local cells. The known spectrum includes, but is not limited to, prostaglandins, pentraxins, complement components, anaphylotoxins, cytokines, chemokines, proteases, protease inhibitors, adhesion molecules, and free radicals. This spectrum offers a huge variety of targets for new anti‐inflammatory agents. It has been suggested, largely on the basis of transgenic mouse models, that stimulating inflammation rather than inhibiting it can be beneficial in such diseases as AD. If this were the case, administration of NSAIDs, or other anti‐inflammatory drugs, would be expected to exacerbate conditions such as AD, PD, and atherosclerosis. However, epidemiological evidence overwhelmingly demonstrates that the reverse is true. This indicates that, at least in these diseases, the inflammation is harmful. So far, advantage has not been taken of opportunities indicated by these epidemiological studies to treat AD and PD with appropriate anti‐inflammatory agents. Based on this evidence, classical NSAIDs are the most logical choice. Dosage, though, must be sufficient to combat the inflammation. Analysis of mRNA levels of inflammatory mediators indicates that the intensity of inflammation is considerably higher in AD hippocampus and in PD substantia nigra than in osteoarthritic joints. Thus, full therapeutic doses of NSAIDs, or combinations of anti‐inflammatory agents, are needed to achieve the suggested neurological benefits.</abstract>
<subject lang="en">
<genre>Keywords</genre>
<topic>Alzheimer's disease</topic>
<topic>Parkinson's disease</topic>
<topic>amyotrophic lateral sclerosis</topic>
<topic>tauopathies</topic>
<topic>osteoarthritis</topic>
<topic>rheumatoid arthritis</topic>
<topic>atherosclerosis</topic>
<topic>myocardial infarction</topic>
<topic>NSAIDs</topic>
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<title>Annals of the New York Academy of SciencesProtective Strategies for Neurodegenerative Diseases</title>
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<genre type="Journal">journal</genre>
<identifier type="ISSN">0077-8923</identifier>
<identifier type="eISSN">1749-6632</identifier>
<identifier type="DOI">10.1111/(ISSN)1749-6632</identifier>
<identifier type="PublisherID">NYAS</identifier>
<part>
<date>2004</date>
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<caption>vol.</caption>
<number>1035</number>
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<caption>no.</caption>
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<identifier type="DOI">10.1196/annals.1332.007</identifier>
<identifier type="ArticleID">NYAS104</identifier>
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