Abstract
IL-1β reduces the activity and protein expression of Na+-K+-ATPase in rat kidney cells. The aim of the present study was to elucidate the signalling pathway involved, using the LLC-PK1 cell line. In these cells IL-1β caused a time and concentration-dependent decrease in the protein expression of the Na+-K+-ATPase. Inhibition of extracellular signal-regulated kinase (ERK), nuclear factor-κB (NF-κB) and cyclooxygenase (COX), but not p38 mitogen-activated kinase (MAPK), abolished the effect of the cytokine on the pump. The activation of NF-κB by IL-1β was maximal at 20 min and declined thereafter. Inhibition of the transcription factor by pyrrolidinediethyldithiocarbamate (PDTC) down-regulated the ATPase. The effects of IL-1β on the pump and NF-κB were prevented by the COX inhibitor indomethacin. Exogenous PGE2 reduced protein expression of the ATPase within 15 min, even in presence of an ERK inhibitor. It is concluded that IL-1β stimulates the mitogen and extracellular signal regulated protein kinase kinase/extracellular signal regulated protein kinase (MEK/ERK) pathway. This activates NF-κB, thus leading to increased COX-2 expression and PGE2 release. PGE2 in turn inhibits NF-κB and reduces the protein expression of Na+-K+-ATPase.
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This work was supported from a grant from the University Research Board and the National Lebanese Council for Scientific Research.
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Kreydiyyeh, S.I., Al-Sadi, R. The signal transduction pathway that mediates the effect of interleukin-1 beta on the Na+-K+-ATPase in LLC-PK1 cells. Pflugers Arch - Eur J Physiol 448, 231–238 (2004). https://doi.org/10.1007/s00424-004-1242-0
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DOI: https://doi.org/10.1007/s00424-004-1242-0