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  • Title: Cyclosporin A enhances interleukin-8 expression by inducing activator protein-1 in human aortic smooth muscle cells.
    Author: Murakami R, Kambe F, Mitsuyama H, Okumura K, Murohara T, Niwata S, Yamamoto R, Seo H.
    Journal: Arterioscler Thromb Vasc Biol; 2003 Nov 01; 23(11):2034-40. PubMed ID: 12958044.
    Abstract:
    OBJECTIVE: Cyclosporin A (CsA) and tacrolimus (FK506) are widely used as immunosuppressants. However, their use has been hampered by various adverse effects, such as acceleration of atherosclerosis. Interleukin (IL)-8, a chemotactic cytokine, plays an important role in pathogenesis of atherosclerosis. We thus investigated whether synthesis of IL-8 from primary human aortic smooth muscle cells is influenced by CsA and FK506. METHODS AND RESULTS: Northern blot analysis revealed that CsA increased IL-8 mRNA level and enhanced its increase by epidermal growth factor or tumor necrosis factor-alpha. In contrast, FK506 had no effect on the mRNA level. IL-8 accumulation in culture media was also increased by CsA. Stability of IL-8 mRNA was not affected by CsA, whereas luciferase reporter gene assay using the human IL-8 promoter revealed that CsA significantly augmented the promoter activity. Electrophoretic mobility shift assay showed that binding activity of activator protein (AP)-1 was increased by CsA, and introduction of a mutation into the AP-1 site in the promoter abolished its CsA-dependent activation. The increased AP-1 binding activity was accompanied by c-Fos synthesis. CONCLUSIONS: CsA stimulates synthesis of IL-8 via activation of AP-1 in human aortic smooth muscle cells, providing a novel aspect of biological effects of CsA on the cells.
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