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  • Title: Prolonged induction of c-fos in neuropeptide Y- and somatostatin-immunoreactive neurons of the rat dentate gyrus after electroconvulsive stimulation.
    Author: Woldbye DP, Greisen MH, Bolwig TG, Larsen PJ, Mikkelsen JD.
    Journal: Brain Res; 1996 May 13; 720(1-2):111-9. PubMed ID: 8782903.
    Abstract:
    Induction of c-fos mRNA and Fos was studied in the hilus and granular layer of the dentate gyrus at various times up to 24 h after single electroconvulsive stimulation (ECS) using in situ hybridization and immunocytochemistry. In both areas of the dentate gyrus, a prominent induction of c-fos mRNA and Fos was observed. Compared to the granular layer, however, c-fos mRNA and Fos in hilar cells reached maximum later and remained elevated considerably longer. Several neurochemically distinct populations of hilar neurons have been described, some of which contain neuropeptide Y (NPY) and/or somatostatin (SS). Using double-labelling immunocytochemistry, we examined to what extent Fos was induced in these hilar neurons after ECS. Although a minor population of non-NPY non-SS cells displayed Fos induction early after ECS, prolonged induction of Fos almost exclusively occurred in NPY or SS neurons. The Fos-immunoreactive NPY or SS neurons only amounted to about 50% of the total hilar population of NPY or SS neurons. The present observations suggest that a subpopulation of hilar NPY and SS neurons may be central to the actions of electroconvulsive seizures in the dentate gyrus.
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