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- W2010044037 abstract "Undifferentiated rat pheochromocytoma (PC12) cells extend neurites when cultured in the presence of nerve growth factor (NGF). Extracellular guanosine synergistically enhances NGF-dependent neurite outgrowth. We investigated the mechanism by which guanosine enhances NGF-dependent neurite outgrowth. Guanosine administration to PC12 cells significantly increased guanosine 3',5'-cyclic monophosphate (cGMP) within the first 24 h whereas addition of soluble guanylate cyclase (sGC) inhibitors abolished guanosine-induced enhancement of NGF-dependent neurite outgrowth. sGC may be activated either by nitric oxide (NO) or by carbon monoxide (CO). [Formula: see text]-Nitro-L-: arginine methyl ester (L-: NAME), a non-isozyme selective inhibitor of nitric oxide synthase (NOS), had no effect on neurite outgrowth induced by guanosine. Neither nNOS (the constitutive isoform), nor iNOS (the inducible isoform) were expressed in undifferentiated PC12 cells, or under these treatment conditions. These data imply that NO does not mediate the neuritogenic effect of guanosine. Zinc protoporphyrin-IX, an inhibitor of heme oxygenase (HO), reduced guanosine-dependent neurite outgrowth but did not attenuate the effect of NGF. The addition of guanosine plus NGF significantly increased the expression of HO-1, the inducible isozyme of HO, after 12 h. These data demonstrate that guanosine enhances NGF-dependent neurite outgrowth by first activating the constitutive isozyme HO-2, and then by inducing the expression of HO-1, the enzymes responsible for CO synthesis, thus stimulating sGC and increasing intracellular cGMP." @default.
- W2010044037 created "2016-06-24" @default.
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- W2010044037 date "2005-03-07" @default.
- W2010044037 modified "2023-10-12" @default.
- W2010044037 title "Guanosine stimulates neurite outgrowth in PC12 cells via activation of heme oxygenase and cyclic GMP" @default.
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- W2010044037 doi "https://doi.org/10.1007/s11302-005-6214-0" @default.
- W2010044037 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2096532" @default.
- W2010044037 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18404501" @default.
- W2010044037 hasPublicationYear "2005" @default.
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