Regulation of chemokine production via oxidative pathway in HeLa cells.

Shinichiro Kina, Toshiyuki Nakasone, Hiroyuki Takemoto, Akira Matayoshi, Shoko Makishi, Nao Sunagawa, Feixin Liang, Thongsavanh Phonaphonh, Hajime Sunakawa

Department of Clinical Neuroscience Oral and Maxillofacial Functional Rehabilitation, University of Ryukyus, Nishihara, Okinawa 903-0215, Japan.

Mediators of inflammation 2009

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Inflammation is associated with disease progression and, by largely unknown mechanisms, has been said to drive oncogenesis. At inflamed sites, neutrophils deploy a potent antimicrobial arsenal that includes proteinases, antimicrobial peptides, and ROS. Reactive oxygen species (ROSs) induce chemokines. In the present study, the concentrations of IL-8 in culture supernatants of HeLa cells treated with ROS were determined by enzyme-linked immunosorbent assay. We used o-phenanthroline to deplete Fe(2+) in order to investigate the mechanisms through which ROSs induce IL-8 secretion in our system. The iron chelator o-phenanthroline effectively inhibited H(2)O(2)-induced ERK2 activation. Enzyme-linked immunosorbent assays showed that IL-8 protein secretion was elevated in ROS-treated HeLa cells. When Fe(2+) was removed from these cells, IL-8 secretion was inhibited. Collectively, these results indicate that Fe(2+)-mediated Erk pathway activation is an important signal transduction pathway in ROS-induced IL-8 secretion in epithelial cells.

Citation

Shinichiro Kina, Toshiyuki Nakasone, Hiroyuki Takemoto, Akira Matayoshi, Shoko Makishi, Nao Sunagawa, Feixin Liang, Thongsavanh Phonaphonh, Hajime Sunakawa. Regulation of chemokine production via oxidative pathway in HeLa cells. Mediators of inflammation. 2009;2009:183760