IL-15 up-regulates iNOS expression and NO production by gingival epithelial cells |
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Authors: | Yanagita Manabu Shimabukuro Yoshio Nozaki Takenori Yoshimura Naoko Watanabe Junko Koide Hiroko Terakura Mami Saho Teruyuki Takedachi Masahide Jang Myoung-Ho Kiyono Hiroshi Murakami Shinya |
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Institution: | Department of Periodontology, Division of Oral Biology and Disease Control, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Japan. |
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Abstract: | To investigate the biological activity of epithelial cells in view of host defense, we analyzed the mRNA expression of inducible NOS (iNOS) as well as NO production by human gingival epithelial cells (HGEC) stimulated with IL-15. RT-PCR analysis revealed that HGEC expressed IL-15 receptor alpha-chain mRNA. In addition, stimulation with IL-15 enhanced iNOS expression by HGEC through an increase of both mRNA and protein levels. Moreover, IL-15 up-regulated the production of NO(2)(-)/NO(3)(-), a NO-derived stable end product, from HGEC. The enhanced NO production by IL-15 was inhibited by AMT, an iNOS-specific inhibitor. These results suggest that IL-15 is a potent regulator of iNOS expression by HGEC and involved in innate immunity in the mucosal epithelium. |
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Keywords: | iNOS NO Gingival epithelial cells Interleukin 15 Periodontal diseases |
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