title: Cholinergic deafferentation of the hippocampus causes non-temporally graded retrograde amnesia in an odor discrimination task.
abstract: Dementia of the Alzheimer's type (DAT) is a neurodegenerative disorder marked by loss of hippocampal cholinergic tone and significant memory impairments, specifically for memories acquired prior to disease onset. The nature of this relationship, however, remains debated. The current study used the string pulling task to evaluate the temporal effects of odor discrimination learning in animals with selective cholinergic lesions to determine the role of the septohippocampal cholinergic system in mnemonic function. Rats with 192-IgG-Saporin lesions to the medial septum had a higher number of correct responses in the reversal training when compared to sham rats, suggesting an inability to retrieve the previously learned discrimination; however, no temporal gradient was observed. Furthermore, there were no group differences when learning a novel odor discrimination, demonstrating the ability for all rats to form new memories. These results establish a role for the cholinergic medial septum projections in long-term memory retrieval. The current study provides a behavioral assessment technique to investigate factors that influence mnemonic deficits associated with rodent models of DAT.
authors.affiliation: Psychology Department Northern Illinois University De Kalb, IL, USA.
authors.forename: Jenny R
authors.initials: JR
authors.lastname: Köppen
authors.affiliation: Psychology Department Northern Illinois University De Kalb, IL, USA.
authors.forename: Sarah L
authors.initials: SL
authors.lastname: Stuebing
authors.affiliation: Psychology Department Northern Illinois University De Kalb, IL, USA.
authors.forename: Megan L
authors.initials: ML
authors.lastname: Sieg
authors.affiliation: Psychology Department Northern Illinois University De Kalb, IL, USA.
authors.forename: Ashley A
authors.initials: AA
authors.lastname: Blackwell
authors.affiliation: Psychology Department Northern Illinois University De Kalb, IL, USA.
authors.forename: Philip A
authors.initials: PA
authors.lastname: Blankenship
authors.affiliation: Department of Anatomy Southern Illinois University School of Medicine, Carbondale, Illinois, USA.
authors.forename: Joseph L
authors.initials: JL
authors.lastname: Cheatwood
authors.affiliation: Psychology Department Northern Illinois University De Kalb, IL, USA. Electronic address: dwallace@niu.edu.
authors.forename: Douglas G
authors.initials: DG
authors.lastname: Wallace
mesh_terms: D000648:Amnesia, Retrograde / Q000139:chemically induced / Q000503:physiopathology*; D000818:Animals; D000911:Antibodies, Monoclonal / Q000008:administration & dosage / Q000494:pharmacology; D018678:Cholinergic Agents / Q000008:administration & dosage / Q000494:pharmacology; D004193:Discrimination Learning / Q000502:physiology*; D005260:Female; D006624:Hippocampus / Q000187:drug effects*; D008569:Memory Disorders / Q000139:chemically induced / Q000473:pathology; D057567:Memory, Long-Term / Q000502:physiology*; D009812:Odorants; D051381:Rats; D020318:Rats, Long-Evans; D054789:Ribosome Inactivating Proteins, Type 1 / Q000008:administration & dosage / Q000494:pharmacology; D000076985:Saporins
chemical_list: C085696:192 IgG-saporin; D000911:Antibodies, Monoclonal; D018678:Cholinergic Agents; D054789:Ribosome Inactivating Proteins, Type 1; D000076985:Saporins
keywords: Mnemonic function; Odor discrimination; Retrograde amnesia; Septohippocampal cholinergic system; String pulling