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- W2056228535 abstract "Incubation of rat astrocytes or C6 glioma cells with norepinephrine (NE) suppresses bacterial endotoxin and cytokine-dependent induction of calcium-independent nitric oxide synthase [Feinstein et al., J. Neurochem., 60 (1993) 1945–1948]. We examined if NE also modified l-arginine uptake. Overnight incubation in 10 μM NE reduced the Vmax for uptake by 30–40%, but did not decrease the apparent Km for arginine. Short incubation times (up to 90 min) with NE were without effect. The β-adrenergic receptor agonist isoproterenol was as effective as NE in reducing uptake, while the α-adrenergic receptor agonist phenylephrine produced a slight, but significant decrease. Arginine uptake was similarly decreased by incubating cells with the cyclic AMP (cAMP) analog dibutyryl cAMP (dbcAMP). Both NE and dbcAMP potently blocked glial cell proliferation, however the anti-mitogenic agent cytosine arabinoside had no effect on arginine uptake. These results support the concept that glial cell arginine metabolism is regulated by endogenous neurotransmitters such as NE." @default.
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- W2056228535 date "1997-02-01" @default.
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- W2056228535 title "Norepinephrine suppresses l-arginine uptake in rat glial cells" @default.
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- W2056228535 doi "https://doi.org/10.1016/s0304-3940(97)13402-4" @default.
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