01 October 2005
Interleukin-1α enhances IL-8 secretion through p38 mitogen-activated protein kinase and reactive oxygen species signaling in human pancreatic cancer cellsHirozumi Sawai, Hitoshi Funahashi, Yuji Okada, Yoichi Matsuo, Yoichi Matsuo, Masaki Sakamoto, Minoru Yamamoto, Hiromitsu Takeyama, Tadao Manabe
Med Sci Monit 2005; 11(10): BR343-350 :: ID: 430275
Background:Interleukin (IL)-1α plays an important role in modulating the expression of various growth factors and angiogenic factors in tumor cells. In here, we investigated effect of IL-1α on IL-8 secretion in human pancreatic cancer cells and underlying signal transduction pathways.Material/Methods:IL-8 expression and secretion by pancreatic cancer cells was measured by Western blot and enzyme-linked immunosorbent assay (ELISA), respectively. Activation of extracellular signal regulated kinases-1/2 (ERK-1/2), p38 mitogen-activated protein kinase (MAPK), c-jun aminoterminal kinase, Akt, and nuclear factor-κB (NF-κB) was determined by Western blot. Involvement of reactive oxygen species (ROS) were examined by measuring the H[sub]2[/sub]O[sub]2[/sub]. Activity of activator factor-1 (AP-1) and NF-κB was examined by electrophoretic mobility sift assay (EMSA). Proliferation of human umbilical vein endothelial cells (HUVECs) was determined by the 3-(4,5-dimethylthiazol-2-yl)- 2,5-diphenyltetrazolium bromide dye reduction method and cell count.Results:IL-1α modulated IL-8 secretion and induced activation of ERK-1/2 and p38 MAPK. Specific inhibitors for MEK-1 and p38 MAPK suppressed IL-8 secretion. IL-1α also induced production of ROS. Exogenous H[sub]2[/sub]O[sub]2[/sub] enhanced IL-8 secretion and N-acetyl cysteine (NAC) prevented IL-1α-induced ROS production and IL-8 secretion. EMSA confirmed that IL-1α increased DNA-binding activity of AP-1 and NF-κB. Inhibitors and ROS scavenger studies revealed that upstream signalings for AP-1 and NF-κB were MAPK and ROS, respectively. Conditioned media from pancreatic cancer cells pretreated with IL-1α remarkably stimulated in vitro HUVECs growth.Conclusions:These results suggest that MAPK/AP-1 and ROS/NF-κB signaling pathways are involved in IL-1α -induced IL-8 secretion and that these paracrine signaling pathways enhance endothelial cell proliferation.
Keywords: Electrophoretic Mobility Shift Assay, Culture Media, Conditioned, Blotting, Western, Enzyme-Linked Immunosorbent Assay, Interleukin-1 - physiology, Interleukin-8 - secretion, Pancreatic Neoplasms - pathology, Signal Transduction - physiology, Transcription Factor AP-1 - metabolism, Tumor Cells, Cultured, p38 Mitogen-Activated Protein Kinases - metabolism
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