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Published on: May 28, 2021
NF-κB-dependent IL-8 induction by prostaglandin E(2) receptors EP(1) and EP(4)
F Neuschäfer-Rube1, A Pathe-Neuschäfer-Rube, S Hippenstiel
1Institut für Ernährungswissenschaft, Universität Potsdam, Nuthetal, Germany. fneusch@uni-potsdam.de
Background And Purpose:
Recent studies suggested a role for PGE(2) in the expression of the chemokine IL-8. PGE(2) signals via four different GPCRs, EP(1) -EP(4) . The role of EP(1) and EP(4) receptors for IL-8 induction was studied in HEK293 cells, overexpressing EP(1) (HEK-EP(1) ), EP(4) (HEK-EP(4) ) or both receptors (HEK-EP(1) + EP(4) ).
Experimental Approach:
IL-8 mRNA and protein induction and IL-8 promoter and NF-κB activation were assessed in EP expressing HEK cells.
Key Results:
In HEK-EP(1) and HEK-EP(1) + EP(4) but not HEK or HEK-EP(4) cells, PGE(2) activated the IL-8 promoter and induced IL-8 mRNA and protein synthesis. Stimulation of HEK-EP(1) + EP(4) cells with an EP(1) -specific agonist activated IL-8 promoter and induced IL-8 mRNA and protein, whereas a specific EP(4) agonist neither activated the IL-8 promoter nor induced IL-8 mRNA and protein synthesis. Simultaneous stimulation of HEK- EP(1) + EP(4) cells with both agonists activated IL-8 promoter and induced IL-8 mRNA to the same extent as PGE(2) . In HEK-EP(1) + EP(4) cells, PGE(2) -mediated IL-8 promoter activation and IL-8 mRNA induction were blunted by inhibition of IκB kinase. PGE(2) activated NF-κB in HEK-EP(1) , HEK-EP(4) and HEK-EP(1) + EP(4) cells. In HEK-EP(1) + EP(4) cells, simultaneous activation of both receptors was needed for maximal PGE(2) -induced NF-κB activation. PGE(2) -stimulated NF-κB activation by EP(1) was blocked by inhibitors of PLC, calcium-signalling and Src-kinase, whereas that induced by EP(4) was only blunted by Src-kinase inhibition.
Conclusions And Implications:
These findings suggest that PGE(2) -mediated NF-κB activation by simultaneous stimulation of EP(1) and EP(4) receptors induces maximal IL-8 promoter activation and IL-8 mRNA and protein induction.
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