Synergy between tumor necrosis factor alpha and interleukin 1beta in inducing transcriptional down-regulation of muscarinic M2 receptor gene expression. Involvement of protein kinase A and ceramide pathways.

The Journal of Biological Chemistry
E B HaddadP J Barnes

Abstract

Stimulation of HEL 299 cells with tumor necrosis factor alpha (TNF-alpha) or interleukin 1beta (IL-1beta) had no effect on M2 muscarinic receptor expression. However, the combination of these two cytokines markedly down-regulated muscarinic M2 receptor protein and mRNA expression and uncoupled M2 receptors from adenylyl cyclase. There was no effect of TNF-alpha and IL-1beta on the m2 muscarinic receptor mRNA stability, and nuclear run-on assays showed reduced m2 receptor gene transcription. Sequential cytokine addition suggests that the synergy involves postreceptor events. Although the cAMP-dependent protein kinase inhibitor H8 provided a significant protection against receptor down-regulation, the protein kinase C inhibitor GF109203X had no effect. The ceramide analog C2-ceramide (N-acetylsphingosine) was without effect on m2 receptor expression. However, a strong synergistic effect was demonstrated when cells were treated with the combination of C2-ceramide and TNF-alpha or IL-1beta. TNF-alpha and/or IL-1beta combination also activated the 46- and 55-kDa c-Jun NH2-terminal protein kinases and to a lesser extent p42 and p44 mitogen-activated protein kinase isoforms. Cycloheximide abolished the TNF-alpha and IL-1beta effect, s...Continue Reading

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