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    Effects of phosphodiesterase inhibition on cortical spreading depression and associated changes in extracellular cyclic GMP.

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    Publication date
    2004
    Author
    Urenjak, Jutta A.
    Fedele, E.
    Obrenovitch, Tihomir P.
    Wang, M.
    Keyword
    Cortical spreading depression
    Nitric oxide
    Cyclic GMP
    Phosphodiesterase inhibition
    Sildenafil
    Microdialysis
    Peer-Reviewed
    Yes
    
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    Abstract
    Cortical spreading depression (CSD) is a temporary disruption of local ionic homeostasis that propagates slowly across the cerebral cortex, and may contribute to the pathophysiology of stroke and migraine. Previous studies demonstrated that nitric oxide (NO) formation promotes the repolarisation phase of CSD, and this effect may be cyclic GMP (cGMP)-mediated. Here, we have examined how phosphodiesterase (PDE) inhibition, either alone or superimposed on NO synthase (NOS) inhibition, alters CSD and the associated changes in extracellular cGMP. Microdialysis probes incorporating an electrode were implanted into the frontoparietal cortex of anaesthetised rats for quantitative recording of CSD, pharmacological manipulations, and dialysate sampling for cGMP measurements. CSD was induced by cathodal electrical stimulation in the region under study by microdialysis. Extracellular cGMP increased, but only slightly, during CSD. Perfusion of either zaprinast or sildenafil through the microdialysis probe, at concentrations that inhibited both PDE5 and PDE9 (and possibly other PDE), increased significantly extracellular cGMP. Unexpectedly, these levels remained high when NOS was subsequently inhibited with N¿-nitro- -arginine methyl ester hydrochloride ( -NAME, 1 mM). The most interesting pharmacological effect on CSD was obtained with sildenafil. This drug altered neither CSD nor the subsequent characteristic effect of NOS inhibition, i.e. a marked widening of CSD. The fact that NOS inhibition still widened CSD in the presence of the high extracellular levels of cGMP associated with PDE inhibition, suggests that NO may promote CSD recovery, independently of cGMP formation.
    URI
    http://hdl.handle.net/10454/2784
    Version
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    Citation
    Urenjak, J.A., Fedele, E., Obrenovich, T.P. and Wang, M. (2004). Effects of phosphodiesterase inhibition on cortical spreading depression and associated changes in extracellular cyclic GMP. Biochemical Pharmacology. Vol.67, No.8, 15 April, pp. 1619-1627.
    Link to publisher’s version
    http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T4P-4BT1XXK-2&_user=122861&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000010080&_version=1&_urlVersion=0&_userid=122861&md5=a3b281b53a0709f09502113bebab85af
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    Article
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    Life Sciences Publications

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