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. 1993 Apr 15;90(8):3462–3465. doi: 10.1073/pnas.90.8.3462

Nitric oxide/cGMP pathway stimulates phosphorylation of DARPP-32, a dopamine- and cAMP-regulated phosphoprotein, in the substantia nigra.

K Tsou 1, G L Snyder 1, P Greengard 1
PMCID: PMC46320  PMID: 8386374

Abstract

DARPP-32, a dopamine- and cAMP-regulated phosphoprotein of M(r) 32,000, has been shown to be phosphorylated on threonine-34, both in vitro with high efficiency by cAMP-dependent and cGMP-dependent protein kinases and in vivo by dopamine acting through cAMP-dependent protein kinase. In the present study, we investigated the nitric oxide (NO)/cGMP pathway for its ability to regulate the state of phosphorylation of DARPP-32 in slices of rat substantia nigra. DARPP-32 was phosphorylated on threonine-34 in these slices by sodium nitroprusside (SNP), an NO donor. The effect of SNP was abolished by preincubation of the slices with hemoglobin, indicating that the effect of SNP was due to released NO. The same concentration of SNP produced a 4-fold elevation of the cGMP level but did not alter the level of cAMP. The effect of SNP on DARPP-32 phosphorylation was mimicked by low concentrations of 8-bromo-cGMP and 8-(4-chlorophenylthio)-guanosine 3',5'-cyclic monophosphate, activators of cGMP-dependent protein kinase, but not by low concentrations of 8-bromo-cAMP, an activator of cAMP-dependent protein kinase. The data indicate a physiological role for the NO/cGMP pathway in the regulation of DARPP-32 phosphorylation in nerve terminals of striatonigral neurons. The results provide further evidence that the state of phosphorylation of DARPP-32 represents an important mechanisms for integration of information arriving at striatonigral neurons via a variety of neuronal pathways.

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