JNK信号通路介导的凋亡在疾病中的作用

c-Jun NH2-terminal kinase suppression significantly inhibits the growth of transplanted breast tumors in mice

Objective

The current study investigated the effect of c-Jun NH2-terminal kinase (JNK) expression on the growth of transplanted breast cancer tumors in mice.

Methods

A breast cancer transplantation model was established in BALB/c mice, which were then treated with SP600125 (30 mg/kg) for 24 days. After sacrificing the mice, the inhibitory effects of SP600125 on breast cancer growth were calculated by weighing tumors. Moreover, vascular endothelial growth factor (VEGF) expression and the tumor microvascular density (MVD) were evaluated via immunohistochemistry. Cell apoptosis was also examined using a TUNEL kit.

Results

Compared with the findings in the control group, SP600125 treatment (30 mg/kg) obviously suppressed tumor growth during the 15-day observation period. SP600125 treatment markedly inhibited JNK mRNA expression. Furthermore, VEGF protein expression (50% vs. 100%) and MVD (18.27 ± 1.70 vs. 23.17 ± 4.02) were also significantly decreased by SP600125 treatment, whereas the apoptosis index was significantly higher in the treatment group (10.23 ± 1.97% vs. 4.53 ± 1.40%).

Conclusion

Inhibition of JNK signaling can significantly suppress the growth of transplanted breast tumors in mice.

Pancreatic signal pathways potentially used as targets for treatment of diabetes

The pancreas is the main place where pathological changes of diabetes occur, and inflammation and oxidative stress can interfere with various cell signaling pathways, causing pancreatic lesions and diabetes. Therefore, the pancreas is an important target for the treatment of diabetes. This paper will discuss pancreatic signaling pathways potentially used as targets for the treatment of diabetes in terms of promotion of insulin secretion, inhibition of glucagon secretion, and suppression of islet beta cell apoptosis. The research of these signaling pathways is important for elucidating the pathogenesis of diabetes and developing more safe and effective new drugs. ATP sensitive potassium channel and glucagon like peptide-1 (GLP-1) receptor signaling pathways are associated with insulin secretion and have been widely used as therapeutic targets. The signaling pathway mediated by G protein coupled receptors is a hot spot of diabetes research in recent years, and other signaling pathways are being studied.