Ceramide mimics tumour necrosis factor-alpha in the induction of cell cycle arrest in endothelial cells. Induction of the tumour suppressor p53 with decrease in retinoblastoma/protein levels.

Publisher: Blackwell Science Ltd. on behalf of the Federation of European Biochemical Societies Country of Publication: England NLM ID: 0107600 Publication Model: Print Cited Medium: Print ISSN: 0014-2956 (Print) Linking ISSN: 00142956 NLM ISO Abbreviation: Eur J Biochem Subsets: MEDLINE

Publication: -2004: Oxford, UK : Blackwell Science Ltd. on behalf of the Federation of European Biochemical Societies
Original Publication: Berlin, New York, Springer.

Ceramides/*physiology ; Endothelium, Vascular/*drug effects ; Retinoblastoma Protein/*metabolism ; Sphingosine/*analogs & derivatives ; Tumor Necrosis Factor-alpha/*physiology ; Tumor Suppressor Protein p53/*metabolism; Blotting, Western ; Cell Cycle/physiology ; Cell Division/drug effects ; Cell Survival/drug effects ; Cells, Cultured ; Ceramides/pharmacology ; Dose-Response Relationship, Drug ; Endothelium, Vascular/cytology ; Flow Cytometry ; Humans ; Phosphorylation/drug effects ; Signal Transduction/drug effects ; Sphingomyelins/metabolism ; Sphingosine/pharmacology ; Sphingosine/physiology ; Time Factors ; Tumor Necrosis Factor-alpha/pharmacology ; Umbilical Cord/cytology

Tumour necrosis factor (TNF)-alpha induces a transient increase in N-octanoylsphingosine (C8-ceramide) which has been postulated as an intracellular mediator in TNF-alpha signalling. We tested the ability of C8-ceramide to reproduce the TNF-alpha-mediated interference with endothelial cell proliferation and DNA synthesis. TNF-alpha (10 ng.mL-1) and C8-ceramide (20 microM) inhibited the incorporation of [3H]thymidine into DNA and led to an accumulation of cells in the G1 phase of the cell cycle. When the responses of the tumour suppressors p53 and RB were analysed, it was found that TNF-alpha and C8-ceramide induced increased expression of p53. Treatment with TNF-alpha or C8-ceramide lead to a significant decrease in total retinoblastoma protein (RB) content that correlated with high levels of p53. These results suggest that p53 and RB may complement each other in their contribution to cell cycle arrest. TNF-alpha prevented RB phosphorylation whereas C8-ceramide did not interfere with this process, suggesting that it follows a ceramide-independent pathway.

0 (2,3-N-octanoylsphingosine)
0 (Ceramides)
0 (Retinoblastoma Protein)
0 (Sphingomyelins)
0 (Tumor Necrosis Factor-alpha)
0 (Tumor Suppressor Protein p53)
NGZ37HRE42 (Sphingosine)

Date Created: 20000706 Date Completed: 20000907 Latest Revision: 20190620

20221213

10.1046/j.1432-1327.2000.01436.x

10880954