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Role of cAMP-Dependent Protein Kinase on Acute Picrotoxin-Induced Seizures

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Abstract

cAMP-dependent protein kinase (PKA) is a major modulator of synaptic transmission likely to be involved in molecular and cellular events leading to epileptogenesis, but little is known about how it affects the onset of acute epileptic seizures. In this study, we determined PKA enzymatic activity in the rat hippocampus during picrotoxin-induced seizures, using H-9 dihydrochloride, a PKA inhibitor, to investigate the in vivo effects of this enzyme on seizures induced by picrotoxin microdialysis in the rat hippocampus. No significant modifications were found in PKA activity during seizures as compared to control rats, but H-9 dihydrochloride microperfusion (100 μM) prevented picrotoxin seizures in 50% of the animals and significantly reduced the mean number of seizures and mean seizure duration. These results suggest that acute picrotoxin-induced seizures occur without an increase in hippocampal PKA activity, but reduced PKA-mediated phosphorylation protects against picrotoxin seizures, probably by increasing the inhibitory potential of GABAA receptors. The possibility of other targets for H-9 dihydrochloride, such as PKC, PKG or CAMKII, however, cannot be ruled out.

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Authors and Affiliations

  1. Neuroscience Division, Department of Biochemistry and Molecular Biology, School of Medicine, University of Santiago, San Francisco 1, 15782, Santiago de Compostela, Spain

    Araceli Vázquez-López, Germán Sierra-Paredes & Germán Sierra-Marcuño

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  1. Araceli Vázquez-López
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  2. Germán Sierra-Paredes
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  3. Germán Sierra-Marcuño
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Correspondence to Germán Sierra-Marcuño.

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Vázquez-López, A., Sierra-Paredes, G. & Sierra-Marcuño, G. Role of cAMP-Dependent Protein Kinase on Acute Picrotoxin-Induced Seizures. Neurochem Res 30, 613–618 (2005). https://doi.org/10.1007/s11064-005-2748-3

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