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- W2050785959 abstract "Extracellularly added P 1 ,P 3 ‐di(adenosine‐5′) triphosphate (Ap 3 A), P 1 ,P 4 ‐di(adenosine‐5′) tetraphosphate (Ap 4 A), ATP, ADP, AMP and adenosine are growth inhibitory for rat C6 glioma cells. Analysis of nucleotide hydrolysis and the use of nucleotidase inhibitors demonstrated that the latter inhibition is due to hydrolysis of the nucleotides to adenosine. Agonists of the P2Y AC − ‐receptor enhance the growth of C6 cells if their hydrolysis to adenosine is inhibited by pyridoxalphosphate‐6‐azophenyl‐2′,4′‐disulfonic acid (PPADS). In these conditions, the potency to stimulate cell growth parallels the ranking of the receptor agonists, i.e. 2‐methylthioadenosine‐5′‐diphosphate (2MeSADP)>Ap 3 A>Ap 4 A. ATP and ADP are still hydrolysed in the presence of PPADS and have no proliferative effect on C6 cells. The enhanced growth is due to a P2Y AC − ‐receptor‐mediated activation of p42/44 mitogen‐activated protein kinase (MAPK) as shown by immunoblotting and protein kinase assays for active MAPK and the use of the MAPK/extracellular signal‐regulated kinase kinase (MEK) inhibitor PD98059. The UTP‐induced enhancement of the growth of C6 cells is due to activation of MAPK by a PPADS sensitive nucleotide receptor. In conclusion, the effect of nucleotides on the growth of C6 cells is determined by ecto‐nucleotidases and by activation of nucleotide receptors. Hydrolysis of nucleotides to adenosine induces growth inhibition while inhibition of the hydrolysis of agonists of the P2Y AC − ‐receptor enhances cell growth by activation of MAPK. British Journal of Pharmacology (2001) 134 , 402–408; doi: 10.1038/sj.bjp.0704271" @default.
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- W2050785959 date "2001-09-01" @default.
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- W2050785959 title "P2Y<sub>AC</sub><sup>−</sup>‐receptor agonists enhance the proliferation of rat C6 glioma cells through activation of the p42/44 mitogen‐activated protein kinase" @default.
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- W2050785959 doi "https://doi.org/10.1038/sj.bjp.0704271" @default.
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