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The antiinflammatory effects of methotrexate are mediated by adenosine.
In summary, intermittent, low dose methotrexate treatment is: 1.) antiinflammatory in the murine air pouch model of inflammation; 2.) selectively increases intracellular AICAR concentration; 3.) increases adenosine concentration in an inflammatory exudate; and, 4.) inhibits leukocyte accumulation at an inflamed site by a mechanism that is specifically reversed by adenosine deaminase and the adenosine A2 receptor antagonist DMPX but not the A1 antagonist DPCPX. In conclusion, we have demonstrated a novel mechanism for the antiinflammatory action of methotrexate; methotrexate is a nonsteroidal antiinflammatory agent that acts by promoting the release of adenosine which engages A2 receptors on inflammatory cells.
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