Abstract
Cyclosporin A (CsA) is an immunosuppressant with severe side effects including gingival overgrowth. We have previously reported that CsA impairs the activity of the lysosomal enzymes cathepsin B and L in human gingival fibroblasts (HGFs). Here, we have examined the effects of CsA on the DNA-binding activity of the cyclic AMP response element-binding protein (CREB) and cell viability, and the effects of CREB on cathepsin B and L synthesis and activity in HGFs. We have confirmed that CsA down-regulates cathepsin B and L synthesis. Further, CsA has no effect on cell viability and dramatically impairs CREB-DNA binding activity. Importantly, the synthesis of cathepsin B and L is down-regulated, and their activity is also significantly impaired in HGFs transfected with plasmid expressing dominant-negative CREB. These results suggest that CREB is essential for the CsA-mediated down-regulation of cathepsin B and L synthesis in HGFs.
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Acknowledgement
We greatly thank Scott Messenger at NASA Johnson Space Center for the revision of the manuscript and for encouragement in our research.
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This work was supported by a Grant-in-Aid for Young Scientists (B 18791592 to K.N.) from the Japan Society for the Promotion of Science.
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Omori, K., Naruishi, K., Yamaguchi, T. et al. cAMP-response element binding protein (CREB) regulates cyclosporine-A-mediated down-regulation of cathepsin B and L synthesis. Cell Tissue Res 330, 75–82 (2007). https://doi.org/10.1007/s00441-007-0457-8
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DOI: https://doi.org/10.1007/s00441-007-0457-8