COX-2 inhibition prevents insulin-dependent diabetes in low-dose streptozotocin-treated mice |
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Authors: | Tabatabaie T Waldon A M Jacob J M Floyd R A Kotake Y |
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Affiliation: | Free Radical Biology and Aging Research Program, Oklahoma Medical Research Foundation, 825 N. E. 13th Street, Oklahoma City, Oklahoma 73104, USA. Tahereh-Tabatabaie@omrf.ouhsc.edu |
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Abstract: | Insulin-dependent diabetes mellitus (IDDM) is an autoimmune disease believed to be caused by an inflammatory process in the pancreas leading to selective destruction of the beta cells. Inducible cyclooxygenase (COX-2) is expressed under inflammatory conditions and its product prostaglandin E(2) (PGE(2)) is an important inflammation mediator. We report here that administration of the selective COX-2 inhibitor NS-398 prevents the onset of diabetes in mice brought on by multiple low-doses of streptozotocin (STZ). Histological observations indicated that STZ-mediated destruction of beta cells was prevented by NS-398 treatment. Delayed (day 3) administration of NS-398 was also protective in this model. No protective effect was observed when NS-398 was administered prior to a high, toxic dose of STZ. These results demonstrate the critical importance of COX-2 activity in autoimmune destruction of beta cells, and point to the fact that COX-2 inhibition can potentially develop into a preventive therapy against IDDM. |
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