UVB-induced GM-CSF production is suppressed by dexamethasone in HaCaT Cells
Epidermal keratinocytes are important sources of a wide variety of cytokines that include the Granulocyte-macrophage Colony Stimulating Factor (GM-CSF). Glucocorticoids have been shown to inhibit the production of several cytokines. However, their effect on GM-CSF synthesis by keratinocytes is still unknown. Methods:
The effects of glucocorticoid on GM-CSF production by keratinocytes were evaluated using ELISA and RT-PCR analysis. Results:
GM-CSF secretion by HaCaT cells increased with increasing UVB exposure. Dexamethasone suppressed basal release of GM-CSF. In addition, it strongly inhibited both the UVB-mediated augmentation of GM-CSF protein production and mRNA expression. Lincomycin enhanced slightly the inhibitory effect of dexamethasone on GM-CSF synthesis, while lincomycin itself had no effect on GM-CSF secretion. Conclusion:
Results showed that dexamethasone suppressed basal release and UVB-induced production of GM-CSF by keratinocytes.
Document Type: Research Article
Affiliations: Department of Dermatology and
Publication date: June 1, 2001