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. 1994 Jun 7;91(12):5387–5391. doi: 10.1073/pnas.91.12.5387

Two distinct signaling pathways trigger the expression of inducible nitric oxide synthase in rat renal mesangial cells.

D Kunz 1, H Mühl 1, G Walker 1, J Pfeilschifter 1
PMCID: PMC44000  PMID: 7515501

Abstract

The expression of nitric oxide synthase (NOS; EC 1.14.13.39) is induced in rat glomerular mesangial cells by exposure to the inflammatory cytokine interleukin 1 beta (IL-1 beta) or cAMP-elevating agents. Stimulation with IL-1 beta alone leads to an approximately 40-fold increase in NOS activity and nitrite synthesis, whereas the elevation of cAMP with forskolin, cholera toxin, salbutamol, or dibutyryl-cAMP for 24 h resulted in a 2- to 12-fold increase in NOS activity. Moreover, the combinations of IL-1 beta with each of the cAMP-elevating agents greatly enhanced NOS activity in a synergistic fashion. Northern-blot analysis demonstrated a single band of approximately 4.5 kb for the NOS mRNA in rat mesangial cells. IL-1 beta increased NOS mRNA levels in a dose- and time-dependent fashion with a peak of NOS mRNA at 24 h. Dibutyryl-cAMP also increased NOS mRNA levels in mesangial cells in a dose- and time-dependent manner. Furthermore, combination of IL-1 beta and forskolin revealed a strong synergy with maximal mRNA levels 12 h after stimulation. Nuclear run-on transcription experiments suggest that IL-1 beta and cAMP synergistically interact to increase NOS gene expression at the transcriptional level. Furthermore, message stability studies established that NOS mRNA induced by cAMP has a longer half-life than the IL-1 beta-induced message. Moreover, cAMP exposure markedly prolonged the half-life of NOS mRNA from 1 h to 3 h. These data suggest that the level of NOS mRNA is controlled by at least two different signaling pathways, one involving cAMP and the other being triggered by cytokines such as IL-1 beta. The two pathways act synergistically and thus potently up-regulate the expression of inducible NOS in rat mesangial cells.

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Selected References

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