© 1996 Medical Council on Alcohol
research-article
NO LOSS OF SOMATOSTATIN-IMMUNOREACTIVE NEURONS IN THE HIPPOCAMPAL DENTATE HILUS OF ALCOHOL-WITHDRAWAL-KINDLED RATS
Neuropsychiatric Research Group, Department of Psychiatry Rigshospitalet, Blegdamsvej 9, DK-2100 Copenhagen
1Department of Psychiatry, Bispebjerg Hospital, Bispebjerg Bakke 23, DK-24OO Copenhagen NV Denmark
*Author to whom correspondence should be addressed
Received 14 October 1995; first review notified 7 March 1996; accepted 19 March 1996
The neuropeptide somatostalin has been suggested to play a role in seizure genesis, electrical kindling and the neurotoxic effects of alcohol. The purpose of the present experiment was to study somatostatin-immunoreactive (SS-IR) neurons in hippocampus during alcohol-withdrawal kindling. Alcohol-withdrawal kindling was performed by subjecting male Wistar rats to seven weekly episodes consisting of 2 days of severe alcohol intoxication and 5 days of alcohol withdrawal. Then the kindled animals (multiple withdrawal group) and a single withdrawal group, which was fed isocaloncally with the kindled animals during episodes 17, were exposed to 4 days of severe alcohol intoxication (episode 8). During the following withdrawal, the seizure activity was observed 915 h after last alcohol dose, in order to subdivide the animals from these two groups into groups with and without seizures. Subsequently, SS-IR neurons were visualized immunocytochemically and counted in the hilus of the dentate gyms (hippocampus). The number of SS-IR neurons per unit area of the hilus was neither affected by a single nor by multiple episodes of alcohol withdrawal. We therefore concluded that a loss of these neurons is not involved in the development of alcohol-withdrawal-kindled seizures.
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