Abstract:
Objective and Design: IL-8 is a chemokine that activates and recruits neutrophils and plays a major role in intestinal inflammation. Signal transduction pathways mediated by protein kinases are central in regulating IL-8 gene expression, however, little is known about the role of Ca2+ in this event. In this study, we characterize the effect of intracellular Ca2+ on interleukin-8 gene expression in T84 human colonic epithelial cells.¶Materials and methods: Cells were stimulated with Ca2+ ionophore, A23187 or thapsigargin, a Ca2+-ATPase inhibitor. Semi-quantitative RT-PCR was used to examine IL-8 mRNA and ELISA for protein quantification. Reporter gene techniques were used to determine transcription rate.¶Results: A23187 and thapsigargin caused a dose- and time-dependent accumulation of IL-8 mRNA and protein production which was dependent on the release of Ca2+ from intracellular stores. FK506, a specific inhibitor of calcineurin, inhibited A23187- and thapsigargin-induced IL-8 mRNA expression in a dose dependent manner. Reporter gene studies and actinomycin D chase experiments showed that A23187 and thapsigargin enhanced IL-8 gene transcription and stabilized IL-8 mRNA transcripts, respectively.¶Conclusion: Intracellular Ca2+ plays an important role in regulating IL-8 transcriptionally and posttranscriptionally through calcium/calmodulin-dependent calcineurin.¶
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Received 21 November 2000; returned for revision 21 November 2000; accepted by I. Ahufelt-Rønne 1 December 2000
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Yu, Y., De Waele, C. & Chadee, K. Calcium-dependent interleukin-8 gene expression in T84 human colonic epithelial cells. Inflamm. res. 50, 220–226 (2001). https://doi.org/10.1007/s000110050747
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DOI: https://doi.org/10.1007/s000110050747