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Opposing effects of P2X~7~ and P2Y purine/pyrimidine‐preferring receptors on proliferation of astrocytes induced by fibroblast growth factor‐2: Implications for CNS development, injury, and repair by Joseph T. Neary; You-Fang Shi; Yuan Kang; Minh D. Tran is a Neuroscience article available to read on EtoBox.

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Extracellular nucleotides play important trophic roles in development and central nervous system (CNS) injury, but the functions of distinct purinergic receptors and related signaling pathways have not been fully elucidated. In the present study we identified opposing effects of P2X and P2Y receptors on the ability of FGF2 to induce proliferation in primary cultures of rat cortical astrocytes. Low concentrations of ATP enhanced DNA synthesis induced by FGF2, whereas high concentrations inhibited FGF2-induced proliferation. Comparison of concentration-response experiments with ATP and 2',3'-O-(4-benzoyl)-benzoyl-ATP (BzATP) indicated that the inhibitory effect was mediated by P2X(7) receptors. Interestingly, activation of P2X(7) receptors led to a state of reversible growth arrest rather than cell death. Selectivity studies showed that proliferation evoked by epidermal growth factor and platelet-derived growth factor was also inhibited by P2X(7) receptors, but P2X(1) or P2X(3) receptors did not inhibit proliferation induced by FGF2. A marker of mitosis, phosphohistone-3, was reduced by BzATP and increased by UTP, suggesting that the enhancing effect of ATP on FGF2-induced proliferat

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Author

Joseph T. Neary; You-Fang Shi; Yuan Kang; Minh D. Tran

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0360-4012)

Published

2008

Language

EN

Field

Neuroscience (Life Sciences)