IL-22 produced by cancer-associated fibroblasts promotes gastric cancer cell invasion via STAT3 and ERK signaling

Background: Interleukin-22 (IL-22) has been recently highlighted owing to its biological significance in the modulation of tissue responses during inflammation. However, the role of IL-22 in carcinogenesis has remained unclear. Here, we investigated the pathophysiological significance of IL-22 expre...

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Veröffentlicht in:British journal of cancer 2014-08, Vol.111 (4), p.763-771
Hauptverfasser: Fukui, H, Zhang, X, Sun, C, Hara, K, Kikuchi, S, Yamasaki, T, Kondo, T, Tomita, T, Oshima, T, Watari, J, Imura, J, Fujimori, T, Sasako, M, Miwa, H
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Sprache:eng
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Zusammenfassung:Background: Interleukin-22 (IL-22) has been recently highlighted owing to its biological significance in the modulation of tissue responses during inflammation. However, the role of IL-22 in carcinogenesis has remained unclear. Here, we investigated the pathophysiological significance of IL-22 expression in gastric cancer tissues and examined the mechanism by which IL-22 promotes gastric cancer cell invasion. Methods: Human gastric cancer specimens were analysed by immunohistochemistry for expression of IL-22 and IL-22 receptor 1 (IL-22R1). The effects of IL-22-induced STAT3 and ERK signalling on invasive ability of gastric cancer cells were examined using a small-interfering RNA system and specific inhibitors. AGS cells were co-cultured with cancer-associated fibroblasts (CAFs) from human gastric cancer tissues and assessed by invasion assay. Results: Interleukin-22 and its receptor were expressed in α -smooth muscle actin-positive stromal cells and tumour cells at the invasive front of gastric cancer tissues, respectively. The expression of IL-22 and IL-22R1 was significantly related to lymphatic invasion. Interleukin-22 treatment promoted the invasive ability of gastric cancer cells through STAT3 and ERK activation. The invasive ability of gastric cancer cells was significantly enhanced by co-culture with IL-22-expressing CAFs. Conclusions: Interleukin-22 produced by CAFs promotes gastric cancer cell invasion via STAT3 and ERK signalling.
ISSN:0007-0920
1532-1827
DOI:10.1038/bjc.2014.336