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Title: Increased striatal proenkephalin mRNA subsequent to production of spreading depression in rat cerebral cortex: activation of corticostriatal pathways?
Austin Authors: Arabia, A M;Shen, Pei-Juan;Gundlach, Andrew L
Affiliation: The University of Melbourne, Clinical Pharmacology and Therapeutics Unit, Department of Medicine, Austin and Repatriation Medical Centre, Heidelberg, Victoria, 3084, Australia
Issue Date: 30-Oct-1998
Publication information: Brain Research. Molecular Brain Research; 61(1-2): 195-202
Abstract: Cortical Spreading Depression (CSD) is a slowly propagating wave of depolarization and negative interstitial DC potential, that when induced in the rat brain extends across the entire homolateral hemisphere. Despite evidence that CSD does not penetrate into subcortical regions, neurochemical changes in areas anatomically connected to cortex have been reported. In this study in situ hybridization histochemistry was used to examine the levels of cholecystokinin (CCK), proenkephalin (ENK) and prodynorphin (DYN) mRNA in cortex and forebrain basal ganglia following KCl-induced CSD. Unilateral CSD was induced by topical application of 3 M KCl ( approximately 10 microliter) onto the right parietal cortex for 10 min and rats were then killed 1-6 h and 1-28 days later. CCK mRNA levels were increased (P<0.01) in the ipsilateral neocortex 3 h after CSD (13% above levels in contralateral side), reached a peak at 2 days ( approximately 70%) and were still elevated at 7 (30%) but not, 14 or 28 days later. Unilateral CSD also produced a rapid and sustained increase (P<0.05) in ENK mRNA in ipsilateral piriform cortex (from 3 h to 2 days; 70-250% above contralateral), and a delayed increase in caudate putamen and olfactory tubercle at 1 and 2 days ( approximately 25% in both regions), but levels were again equivalent to control at 7 days and beyond. In contrast, no marked changes in neocortical ENK mRNA, or DYN mRNA in both cortex and basal ganglia, were observed under these conditions. These findings demonstrate that CSD has specific, rapid and long-lasting effects on neuropeptide expression in neocortex and subcortical areas. CSD-induced changes in mesostriatal ENK mRNA are proposed to reflect synaptic activation of local neurons via cortical afferent projections.
Gov't Doc #: 9795215
Type: Journal Article
Subjects: Animals
Cerebral Cortex.chemistry.drug effects.metabolism
Corpus Striatum.chemistry.drug effects.metabolism
Depression, Chemical
Gene Expression Regulation.drug effects
In Situ Hybridization
Membrane Potentials.drug effects
Neural Pathways.drug effects.physiology
Potassium Chloride.administration & dosage.pharmacology
Prosencephalon.chemistry.drug effects.metabolism
Protein Precursors.analysis.genetics
RNA, Messenger.analysis.biosynthesis.drug effects
Rats, Sprague-Dawley
Appears in Collections:Journal articles

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