کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1940089 | 1050773 | 2006 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Proteasome inhibitor-induced cyclooxygenase-2 expression in Raw264.7 cells is potentiated by inhibition of c-Jun N-terminal kinase activation Proteasome inhibitor-induced cyclooxygenase-2 expression in Raw264.7 cells is potentiated by inhibition of c-Jun N-terminal kinase activation](/preview/png/1940089.png)
Prostaglandins play regulatory roles in a variety of physiological and pathological processes in immune response and inflammation. MG132, proteasome inhibitor, is known to anti-tumor agent activity and anti-inflammation with inhibitory property of NF-κB. We investigated the effect of MG132 on the expression of cyclooxygenase-2 (COX-2), the rate-limiting enzyme in the synthesis of PGE2, using macrophage cell line, Raw264.7. Our results showed that COX-2 expression is up-regulated by MG132 treatment and that this induction of COX-2 is regulated in part at the transcriptional level. In addition, we demonstrated the signal transduction pathway of mitogen-activated protein kinase (MAP kinase) in MG132-induced COX-2 expression. The p38 MAPK inhibitor (SB 203580) prevented MG132-induced COX-2 expression, whereas c-Jun N-terminal kinase (JNK) inhibitor (SP 600125) and MAPK kinase 4 (MKK4)-DN (dominant negative mutant) and MKK7-DN significantly enhanced COX-2 expression. These results suggest that MG132-induced COX-2 expression is associated with the activation of p38 MAPK and the inhibition of JNK signaling pathways.
Journal: Biochemical and Biophysical Research Communications - Volume 342, Issue 4, 21 April 2006, Pages 1334–1340