Title : Increased, not decreased activation of the insulin-like growth factor (IGF) receptor signalling pathway during ceramide-induced apoptosis.

Pub. Date : 1999 Apr

PMID : 10373346






5 Functional Relationships(s)
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1 Lower ceramide doses were required to induce death in receptor negative compared with receptor positive fibroblasts (P< 0.05 at ceramide doses of 2 microM or greater), not only corroborating evidence that the IGF-I receptor functions as a survival receptor, but also suggesting that ceramide is not inducing apoptosis by suppressing a survival effect of the IGF-IR. Ceramides insulin-like growth factor I receptor Mus musculus
2 Lower ceramide doses were required to induce death in receptor negative compared with receptor positive fibroblasts (P< 0.05 at ceramide doses of 2 microM or greater), not only corroborating evidence that the IGF-I receptor functions as a survival receptor, but also suggesting that ceramide is not inducing apoptosis by suppressing a survival effect of the IGF-IR. Ceramides insulin-like growth factor I receptor Mus musculus
3 Ceramide also enhanced IGF-induced tyrosine phosphorylation of the IGF-I receptor and activated PI-3 kinase. Ceramides insulin-like growth factor I receptor Mus musculus
4 These results indicate that ceramide is capable of eliciting apparently contradictory events within a single cell type, and suggest that in the presence of an IGF-IR, survival is enhanced because ceramide can activate PI-3 kinase, believed to be an anti-apoptotic enzyme. Ceramides insulin-like growth factor I receptor Mus musculus
5 These results indicate that ceramide is capable of eliciting apparently contradictory events within a single cell type, and suggest that in the presence of an IGF-IR, survival is enhanced because ceramide can activate PI-3 kinase, believed to be an anti-apoptotic enzyme. Ceramides insulin-like growth factor I receptor Mus musculus