Journal article Open Access

Role of G-protein-coupled Adenosine Receptors in Downregulation of Inflammation and Protection from Tissue Damage

Bilzer, M.; Ohta, Akio; Sitkovsky, Michail; Gerbes, A. L.


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        <foaf:name>Bilzer, M.</foaf:name>
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        <foaf:name>Ohta, Akio</foaf:name>
        <foaf:givenName>Akio</foaf:givenName>
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        <foaf:name>Sitkovsky, Michail</foaf:name>
        <foaf:givenName>Michail</foaf:givenName>
        <foaf:familyName>Sitkovsky</foaf:familyName>
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        <foaf:name>Gerbes, A. L.</foaf:name>
        <foaf:givenName>A. L.</foaf:givenName>
        <foaf:familyName>Gerbes</foaf:familyName>
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    <dct:title>Role of G-protein-coupled Adenosine Receptors in Downregulation of Inflammation and Protection from Tissue Damage</dct:title>
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    <dct:description>Inappropriate or prolonged inflammation is the main cause of many diseases1; for this reason it is important to understand the physiological mechanisms that terminate inflammation in vivo2. Agonists for several Gs-protein-coupled receptors3, including cell-surface adenosine purinergic receptors4,5,6,7, can increase levels of immunosuppressive cyclic AMP in immune cells8,9,10,11,12,13,14,15; however, it was unknown whether any of these receptors regulates inflammation in vivo. Here we show that A2a adenosine receptors have a non-redundant role in the attenuation of inflammation and tissue damage in vivo. Sub-threshold doses of an inflammatory stimulus16,17 that caused minimal tissue damage in wild-type mice were sufficient to induce extensive tissue damage, more prolonged and higher levels of pro-inflammatory cytokines, and death of male animals deficient in the A2a adenosine receptor. Similar observations were made in studies of three different models of inflammation and liver damage as well as during bacterial endotoxin-induced septic shock. We suggest that A2a adenosine receptors are a critical part of the physiological negative feedback mechanism for limitation and termination of both tissue-specific and systemic inflammatory responses.</dct:description>
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