Cytokines Regulate the Expression of the Thymus and Activation-Regulated Chemokine (TARC; CCL17) in Human Skin Fibroblast Cells

  • Lee, Ji-Sook (Department of Biology, Daejeon University) ;
  • Kim, In-Sik (Department of Clinical Laboratory Science, School of Medicine, Eulji University) ;
  • Kim, Dong-Hee (Department of Pathology, College of Oriental Medicine, Daejeon University) ;
  • Yun, Chi-Young (Department of Biology, Daejeon University)
  • Published : 2006.03.31

Abstract

Allergic inflammation is thought to be a Th2 cell-dominant immune response during which tissue-resident fibroblasts produce chemokines which contribute to the recruitment of migratory leukocytes to sites of tissue injury. Thymus and activation-regulated chemokine (TARC; CCL17) is a potent member of the CC chemokine family and a selective chemoattractant for Th2 cells. In order to study the regulatory profiles of TARC production by $TNF-{\alpha}$, $IFN-{\gamma}$, and Il-4 in human normal skin fibroblast, CCD-986sk cell line was used. The expression of TARC protein was measured using ELISA, and mRNA level was detected by RT-PCR. The combination of $TNF-{\alpha}$ and IL-4 induced a time-and dose-dependent synergistic increase in the expression of TARC at both protein and mRNA levels in the cultured human skin fibroblasts. Exposure of the cells to single cytokine had no effect on TARC expression. The high concentration (100 ng/ml) and long incubation time (72 h) of $IFN-{\gamma}$ further enhanced the TARC production induced by $TNF-{\alpha}$/lL-4 in the skin fibroblast. This synergistic effect of Th1 and Th2 type cytokines on TARC production by skin fibroblasts may contribute to the inflammatory cell infiltration and tissue damage with allergic inflammation.

Keywords

References

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