Cholinergic immunotoxin 192 IgG-SAPORIN alters subicular theta-gamma activity and impairs spatial learning in rats.
Subiculum is an important structure of hippocampal formation and is a part of intra hippocampal network involved in spatial information processing. However, relatively very few studies are available in literature demonstrating the explicit role of subiculum in spatial information processing. The present study investigated the cholinergic modulation of subicular theta-gamma activity on spatial learning and memory functions in rats. The cholinergic projections to ventral subiculum were selectively eliminated using 192 IgG-SAPORIN. Eliminations of cholinergic inputs to ventral subiculum significantly reduced the subicular theta and enhanced the gamma activity during active wake and REM sleep states. In addition, the spatial learning was severely impaired following cholinergic elimination of ventral subiculum. The ChAT immunocytochemical studies showed sparse distribution of cholinergic fibers in the ventral subiculum confirming the cholinergic elimination to ventral subiculum. Cholinotoxic infusions to ventral subiculum did not alter the hippocampal cholinergic innervations and retained the hippocampal theta and gamma activities. The present findings support that cholinergic modulation of subicular theta-gamma oscillations is crucial for spatial information processing.
['Rastogi|Shweta|S|', 'Unni|Sumithra|S|', 'Sharma|Sumit|S|', 'Laxmi|T Rao|TR|', 'Kutty|Bindu M|BM|']
D000818:Animals D000911:Antibodies, Monoclonal D002795:Choline O-Acetyltransferase D002799:Cholinergic Fibers D065818:Gamma Rhythm D006624:Hippocampus D000922:Immunotoxins D008297:Male D051381:Rats D017208:Rats, Wistar D054789:Ribosome Inactivating Proteins, Type 1 D000076985:Saporins D065853:Spatial Learning D013826:Theta Rhythm
Cholinergic projections Ventral subiculum REM sleep Cholinotoxin Spatial memory Theta–gamma oscillations