@article{NeuschaeferRubePatheNeuschaeferRubeHippenstieletal.2013,
  author    = {Neusch{\"a}fer-Rube, Frank and Pathe-Neusch{\"a}fer-Rube, A. and Hippenstiel, S. and Kracht, M. and P{\"u}schel, Gerhard Paul},
  title     = {NF-kB-dependent IL-8 induction by prostaglandin EP2 receptors EP1 and EP4},
  series = {British journal of pharmacology : journal of The British Pharmacological Society},
  volume    = {168},
  journal   = {British journal of pharmacology : journal of The British Pharmacological Society},
  number    = {3},
  publisher = {Wiley-Blackwell},
  address   = {Hoboken},
  issn      = {0007-1188},
  doi       = {10.1111/j.1476-5381.2012.02182.x},
  pages     = {704 -- 717},
  year      = {2013},
  abstract  = {Background and Purpose Recent studies suggested a role for PGE2 in the expression of the chemokine IL-8. PGE2 signals via four different GPCRs, EP1-EP4. The role of EP1 and EP4 receptors for IL-8 induction was studied in HEK293 cells, overexpressing EP1 (HEK-EP1), EP4 (HEK-EP4) or both receptors (HEK-EP1 + EP4). Experimental Approach IL-8 mRNA and protein induction and IL-8 promoter and NF-?B activation were assessed in EP expressing HEK cells. Key Results In HEK-EP1 and HEK-EP1 + EP4 but not HEK or HEK-EP4 cells, PGE2 activated the IL-8 promoter and induced IL-8 mRNA and protein synthesis. Stimulation of HEK-EP1 + EP4 cells with an EP1-specific agonist activated IL-8 promoter and induced IL-8 mRNA and protein, whereas a specific EP4 agonist neither activated the IL-8 promoter nor induced IL-8 mRNA and protein synthesis. Simultaneous stimulation of HEK- EP1 + EP4 cells with both agonists activated IL-8 promoter and induced IL-8 mRNA to the same extent as PGE2. In HEK-EP1 + EP4 cells, PGE2-mediated IL-8 promoter activation and IL-8 mRNA induction were blunted by inhibition of I?B kinase. PGE2 activated NF-?B in HEK-EP1, HEK-EP4 and HEK-EP1 + EP4 cells. In HEK-EP1 + EP4 cells, simultaneous activation of both receptors was needed for maximal PGE2-induced NF-?B activation. PGE2-stimulated NF-?B activation by EP1 was blocked by inhibitors of PLC, calcium-signalling and Src-kinase, whereas that induced by EP4 was only blunted by Src-kinase inhibition. Conclusions and Implications These findings suggest that PGE2-mediated NF-?B activation by simultaneous stimulation of EP1 and EP4 receptors induces maximal IL-8 promoter activation and IL-8 mRNA and protein induction.},
  language  = {en}
}