PMID: 9164862May 15, 1997Paper

NF-kappaB-dependent expression of nitric oxide synthase is required for membrane fusion of chick embryonic myoblasts

The Biochemical Journal
K H LeeM S Kang

Abstract

The activity of nitric oxide synthase (NOS) has recently been shown to increase transiently but dramatically in chick embryonic myoblasts that are competent for fusion and that NO acts as a messenger for the cell fusion. Here we show that the rise in NOS activity is tightly correlated with an increase in NOS protein level, and its synthesis is under transcriptional control. In addition, a partial cDNA sequence of NOS obtained by reverse transcription PCR on total RNA from chick myoblasts was found to be identical with that of the inducible type of NOS (iNOS) from chick macrophage. Thus chick myoblast NOS must belong to the family of iNOS. Consistently, pyrrolidine dithiocarbamate, a potent inhibitor of nuclear factor kappaB (NF-kappaB), prevented the expression of myoblast NOS. Furthermore the antioxidant also strongly inhibited cell fusion, and its inhibitory effect was reversed by treatment with sodium nitroprusside, an NO-generating agent. In addition, nuclear extracts obtained from myoblasts that were competent for fusion, but not those from proliferating cells or from fully differentiated myotubes, were capable of binding to the consensus NF-kappaB site in the promoter region of the gene encoding iNOS. These results sugges...Continue Reading

Citations

Dec 17, 2011·Journal of Signal Transduction·Elena Barbieri, Piero Sestili
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