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Eriochrome Black T inhibits endothelial cell growth through S-phase blockade
I Langer1, G Atassi, P Robberecht
1Department of Biochemistry and Nutrition, Faculty of Medicine, Université Libre de Bruxelles, Brussels, Belgium. ilanger@ulb.ac.be
Abstract:
We used human umbilical vein endothelial cells (HUVEC) cultures to investigate in vitro the antiproliferative effects of suramin and of its analogue, Eriochrome Black T. The cell cycle phases of interest were characterised with specific immune sera raised against cyclin D(1), cyclin E and proliferating nuclear cell antigen (PCNA). Simultaneous detection of two cell cycle markers was ensured by double colour immunofluorescence. Both compounds inhibited the endothelial cell growth while Eriochrome Black T was more potent than suramin. Suramin induced HUVEC to accumulate in G1-phase as an increase of the number of cells expressing both cyclin D(1) and PCNA was observed. Eriochrome Black T preferentially blocked them in the early S-phase, as it increased the proportion of cyclin E positive cells. These results suggest that in addition of its more potent antiproliferative effect on endothelial cell growth, Eriochrome Black T acts at another molecular level than suramin.
Insights
Eriochrome Black T and suramin inhibit endothelial cell growth, with Eriochrome Black T being more potent. Eriochrome Black T blocks cells in early S-phase, while suramin causes G1-phase accumulation.
Area of Science:
- Endothelial cell biology
- Pharmacology
- Cell cycle regulation
Background:
- Endothelial cells play a crucial role in vascular health.
- Suramin is a known antiproliferative agent.
- Understanding the mechanisms of endothelial cell growth inhibition is important for therapeutic development.
Purpose of the Study:
- To investigate the in vitro antiproliferative effects of suramin and its analogue, Eriochrome Black T, on human umbilical vein endothelial cells (HUVEC).
- To characterize the effects of these compounds on specific cell cycle phases.
Main Methods:
- Human umbilical vein endothelial cells (HUVEC) were cultured in vitro.
- Antiproliferative effects were assessed.
- Cell cycle phases were analyzed using immune sera against cyclin D1, cyclin E, and proliferating nuclear cell antigen (PCNA).
- Double-color immunofluorescence was employed for simultaneous detection of cell cycle markers.
Main Results:
- Both suramin and Eriochrome Black T inhibited HUVEC growth.
- Eriochrome Black T demonstrated a more potent antiproliferative effect than suramin.
- Suramin caused HUVEC to accumulate in the G1-phase, indicated by increased cyclin D1 and PCNA expression.
- Eriochrome Black T led to an accumulation of cells in the early S-phase, evidenced by increased cyclin E positivity.
Conclusions:
- Eriochrome Black T exhibits a stronger antiproliferative effect on endothelial cells compared to suramin.
- The compounds act via distinct molecular mechanisms, with suramin affecting G1-phase and Eriochrome Black T impacting early S-phase progression.