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  • Title: ERK, PKC and PI3K/Akt pathways mediate extracellular ATP and adenosine-induced proliferation of U138-MG human glioma cell line.
    Author: Jacques-Silva MC, Bernardi A, Rodnight R, Lenz G.
    Journal: Oncology; 2004; 67(5-6):450-9. PubMed ID: 15714002.
    Abstract:
    OBJECTIVE: Extracellular nucleotides and nucleosides induce proliferation in a set of human glioma cell lines. In this study we investigate the signal transduction pathways involved in ATP and adenosine-mediated proliferation in U138-MG human glioma cells. METHODS: Cell proliferation was accessed through [(3)H]thymidine incorporation, cell counting and flow cytometry. Protein phosphorylation was detected through Western blotting. RESULTS: ATP or adenosine (100 microM) induced extracellular signal-regulated protein kinase (ERK), Akt and GSK3beta phosphorylation. The increase in [(3)H]thymidine incorporation induced by ATP or adenosine was decreased when cells were incubated with LY 294002 (by +/-90%), GF 109203X (by +/-76%) or PD 098059 (by +/-63%). The increase in cell numbers with ATP or adenosine was less after a 48-hour treatment of cells with ATP or adenosine plus GF 109203X (by +/-66%) or LY 294002 (by +/-83%). Percentage of cells in S phase was decreased in cells treated with LY 294002 plus ATP when compared to ATP- treated cells. CONCLUSION: Stimulation of purinergic receptors in U138-MG cells leads to cell proliferation mediated by PI3K/Akt, ERK and PKC signaling. It may be clinically important for pharmacological intervention in gliomas to associate purinergic receptor antagonists and signal transduction pathways blockers.
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