| 저자(한글) |
Ju, Sung Mi,Youn, Gi Soo,Cho, Yoon Shin,Choi, Soo Young,Park, Jinseu |
| 초록 |
Upregulation of pro-inflammatory mediators contributes to ${ beta}$ -cell destruction and enhanced infiltration of immune cells into pancreatic islets during development of type 1 diabetes mellitus. In this study, we examined the regulatory effects and the mechanisms of action of celastrol against cytotoxicity and pro-inflammatory immune responses in the RINm5F rat pancreatic ${ beta}$ -cell line stimulated with a combination of interleukin-1 beta, tumor necrosis factor-alpha, and interferon- ${ gamma}$ . Celastrol significantly restored cytokine-induced cell death and significantly inhibited cytokine-induced nitric oxide production. In addition, the protective effect of celastrol was correlated with a reduction in pro-inflammatory mediators, such as inducible nitric oxide synthase, cyclooxygenase-2, and CC chemokine ligand 2. Furthermore, celastrol significantly suppressed cytokine-induced signaling cascades leading to nuclear factor kappa B (NF- ${ kappa}B$ ) activation, including $I{ kappa}B$ -kinase (IKK) activation, $I{ kappa}B$ degradation, p65 phosphorylation, and p65 DNA binding activity. These results suggest that celastrol may exert its cytoprotective activity by suppressing cytokine-induced expression of pro-inflammatory mediators by inhibiting activation of NF- ${ kappa}B$ in RINm5F cells. |
